WO2018130188A1 - Rubber composite, processing method, rubber belt and rubber roller applying composite, and manufacturing method - Google Patents

Abstract

A rubber composite comprising in terms of parts by weight: a rubber substrate 100 parts, a crosslinking agent 1.5-9 parts, and short fibers 5-60 parts, also comprising auxiliary components. The rubber substrate comprises : branched polyethylene, the content thereof being a : 0 < a ≤ 100 parts, ethylene propylene monomer rubber and ethylene propylene diene monomer rubber, the content thereof being b : 0 ≤ b < 100 parts. The rubber composite is for use in manufacturing a power transmission belt, a conveyor belt, a rubber roller, and a rubber tube.

Description

Rubber composition and processing method, and tape, rubber roller and production method thereof Technical field

The invention belongs to the technical field of rubber, and particularly relates to a short fiber reinforced rubber composition and a processing method thereof, and a tape and a rubber roller and a production method using the rubber composition.

Background technique

With the rapid development of the automotive industry, the engine room drive system is becoming more and more compact, the engine room temperature is getting higher and higher, and some car engine room ambient temperature reaches 150 °C, which leads to the failure of traditional neoprene (CR) drive belts and other products. Claim. Hydrogenated nitrile rubber (HNBR) is expensive and is mainly used for very high timing belts and oilfield-specific transmission belts that require oil and ozone resistance. Ethylene propylene rubber is moderately priced, the molecular backbone is fully saturated, and it has excellent heat resistance. It has become a trend to replace chloroprene rubber for power transmission belts with ethylene propylene rubber. However, compared with neoprene, the mechanical strength of ethylene-propylene rubber has obvious disadvantages and cannot be applied to occasions where the mechanical strength is higher.

Conveyor belts used in high temperature environments, in order to meet the high temperature performance requirements, the rubber compound formula of each part of the conveyor belt (especially the cover layer in direct contact with the material) will also be partially or fully heat resistant. Ethylene propylene rubber.

Ethylene-propylene rubber is also used in the field of heat-resistant rubber rollers.

In general, ethylene propylene rubber is more and more popular in short fiber reinforced high temperature resistant conveyor belts, high temperature resistant transmission belts and high temperature resistant rubber rollers due to its good heat aging resistance. Sulfur vulcanization and peroxide vulcanization are the two most commonly used vulcanization systems for ethylene-propylene rubber, but peroxide vulcanization is often used in order to obtain better high temperature resistance. However, the mechanical strength of peroxide-vulcanized ethylene-propylene rubber is weaker than that of sulfur-vulcanized ethylene-propylene rubber, which is relatively easy to be destroyed during the production and use of the product. How to further improve the aging resistance and mechanical properties of ethylene propylene rubber is a problem.

Ethylene-propylene rubber is a synthetic rubber with saturated molecular chain. It can be divided into two major categories: ethylene-propylene rubber and EPDM rubber. Both of them have good aging resistance. They are commonly used in ethylene-propylene rubber products. It is EPDM rubber, but because EPDM rubber contains a third monomer, the molecular chain contains double bonds, and the ethylene-propylene rubber molecular chain is completely saturated, so the ethylene-propylene rubber has more excellent resistance to aging. Sex, therefore, in the case of high requirements for aging resistance, it is a common technical solution to improve the aging resistance of EPDM by using ethylene propylene diene rubber together. However, the mechanical strength of the binary ethylene propylene rubber is low, which will affect the overall physical and mechanical properties.

Diethylene propylene rubber is a copolymer of ethylene and propylene and belongs to the copolymer of ethylene and α-olefin. Ethylene and α-olefin copolymers are polymers containing only hydrocarbon elements and saturated molecular chains. The common types of carbon atoms in such polymers are generally classified into primary, secondary and tertiary carbons, while tertiary carbons are the most It is easy to be trapped by hydrogen to form free radicals, so the ratio of tertiary carbon atoms to all carbon atoms is generally considered to be a major factor affecting the aging resistance of ethylene and α-olefin copolymers. The lower the ratio, the better the aging resistance. The ratio can be expressed by the degree of branching. For example, a diethylene propylene rubber having a propylene content of 60% by weight can be calculated to contain 200 propylene units per 1000 carbon atoms, that is, 200 tertiary carbon atoms or 200. One methyl branch, so its degree of branching is 200 branches / 1000 carbons. Ethylene ethylene propylene rubber generally has a weight percentage of 40% to 65% or 40% to 60%, so its branching degree is generally 117 to 200 branches/1000 carbons or 133 to 200 branches/ This degree of branching can be considered to be higher than other common ethylene and alpha-olefin copolymers in the 1000 carbon range.

In the prior art, the α-olefin in the common ethylene and α-olefin copolymer may be an α-olefin having a carbon number of not less than 4 in addition to propylene, and may be selected from a C ₄ - C ₂₀ α-olefin. It is usually selected from the group consisting of 1-butene, 1-hexene and 1-octene. If the degree of branching of the copolymer of ethylene and α-olefin is too low, the melting point and crystallinity are too high, and it is not suitable for use as a rubber component. If the degree of branching is high, the content of α-olefin is high, which may result in Process difficulty and raw material cost are high, and operability and economy are low. In the prior art, a polyolefin obtained by copolymerizing ethylene with 1-butene or ethylene and 1-octene may be referred to as a polyolefin plastomer or a polyolefin elastomer according to the degree of crystallinity and melting point, and a part of the polyolefin is elastic. Due to its proper crystallinity and melting point, it can be used well with ethylene propylene rubber and has a low degree of branching. It is considered to be an ideal material for improving the aging resistance of ethylene propylene rubber. It can replace ethylene propylene rubber to a certain extent. use. Since the molecular chain of ethylene and 1-octene copolymer is softer, more rubbery and has good physical and mechanical properties relative to the copolymer of ethylene and 1-butene, the polyolefin elastomer commonly used in rubber products is generally ethylene. And the copolymer of 1-octene, the octene weight percentage is generally not higher than 45%, more commonly not higher than 40%, the corresponding degree of branching is generally not higher than 56 branches / 1000 carbon, The more commonly used degree of branching is not higher than 50 branches/1000 carbons, which is much lower than the degree of branching of ethylene dipropylene rubber, so it has excellent aging resistance and good physical and mechanical properties.

The rubber generally needs to be used after cross-linking. In the cross-linking mode commonly used for ethylene-propylene rubber, the copolymer of ethylene and α-olefin may be peroxide cross-linking or irradiation cross-linking, both of which are mainly obtained by capturing tertiary carbon. a hydrogen atom forms a tertiary carbon radical, and then forms a carbon-carbon crosslink by radical bonding, but a copolymer of ethylene and 1-octene (hereinafter referred to as POE) has fewer tertiary carbon atoms and is attached to a tertiary carbon atom. The chain length is large, the steric hindrance is large, and the free radical reaction is difficult to occur, which leads to difficulty in crosslinking, affecting processing efficiency and product performance.

Therefore, there is a need for a better technical solution that can improve the aging resistance of ethylene propylene rubber, and at the same time, it can have better physical and mechanical properties and cross-linking performance, and is expected to be specific to the functional indexes required for rubber products (such as anti- Compression, permanent deformation, etc.) have a good performance.

Summary of the invention

In view of the problems existing in the prior art, the present invention provides a rubber composition and its application and production method in the fields of a power transmission belt, a conveyor belt, a hose and a rubber roller, and the branching degree is not less than 50 branches/1000. A carbonized branched polyethylene replaces some or all of the ethylene propylene rubber to overcome the above disadvantages and deficiencies of the prior art.

The rubber matrix of the rubber composition of the present invention may be composed entirely of branched polyethylene, or may be composed of branched polyethylene and ethylene propylene copolymer, composed of branched polyethylene and ethylene propylene copolymer, and The polyethylene and the ethylene-propylene copolymer and the ethylene-propylene-propylene copolymer are combined. The combination of branched polyethylene and ethylene propylene copolymer can improve the mechanical properties and processing properties of the ethylene-propylene copolymer. The combination of branched polyethylene and ethylene propylene copolymer can improve the EPDM copolymer. Heat aging resistance and mechanical properties, a small amount of diene in EPDM rubber plays an intrinsic role as a co-crosslinking agent in peroxide vulcanization. This significantly reduces the amount of co-crosslinker required and the cost of adding them.

In order to achieve the above object, the technical solution of the present invention relates to a rubber composition comprising, by weight, a rubber matrix and an essential component, the rubber matrix comprising: a content of branched polyethylene a: 0 < a ≤ 100 parts; the content of the binary ethylene propylene rubber and the ethylene propylene diene rubber b: 0 ≤ b < 100 parts; the essential components include: 1.5 to 9 parts of the crosslinking agent, short fibers, based on 100 parts by weight of the rubber matrix 5 to 60 parts, the branching degree of the branched polyethylene is not less than 50 branches/1000 carbons, the weight average molecular weight is not less than 50,000, and the Mooney viscosity ML (1+4) is not lower than 125 °C. 2.

"Branched polyethylene" in the prior art means, in addition to a branched ethylene homopolymer, a branched saturated vinyl copolymer, such as an ethylene-α-olefin copolymer, which may be POE, although POE performs well in physical and mechanical properties and aging resistance, but cross-linking performance is not good, although the branched polyethylene of the present invention can contain both branched ethylene homopolymer and POE, but a better choice It is a branched polyethylene having a high proportion of branched polyethylene or a branched ethylene homopolymer. In a preferred embodiment of the invention, the branched polyethylene contains only branched ethylene homopolymer.

In the further elaboration of the technical solution of the present invention, the branched polyethylene used is a branched ethylene homopolymer unless otherwise specified.

The branched polyethylene used in the present invention is a kind of ethylene homopolymer having a branching degree of not less than 50 branches/1000 carbons, and can be called Branched Polyethylene or Branched PE. Currently, the synthesis method is mainly composed of a late transition metal catalyst. The homopolymerization of ethylene is catalyzed by a "chain walking mechanism", and the preferred late transition metal catalyst may be one of (α-diimine) nickel/palladium catalysts. The nature of the chain walking mechanism refers to the late transition metal catalyst. For example, the (α-diimine) nickel/palladium catalyst is more likely to undergo β-hydrogen elimination reaction and re-insertion reaction in the process of catalyzing olefin polymerization, thereby causing branching. Branched chains of such branched polyethylenes may have different numbers of carbon atoms, specifically 1 to 6, or more carbon atoms.

The production cost of the (α-diimine) nickel catalyst is significantly lower than that of the (α-diimine) palladium catalyst, and the (α-diimine) nickel catalyst catalyzes the high rate of ethylene polymerization and high activity, and is more suitable for industrial applications. Therefore, the branched polyethylene prepared by the ethylene polymerization of the (α-diimine) nickel catalyst is preferred in the present invention.

The degree of branching of the branched polyethylene used in the present invention is preferably 50 to 130 branches/1000 carbons, further preferably 60 to 130 branches/1000 carbons, further preferably 60 to 116 branches/1000. A carbon, the degree of branching between POE and ethylene-propylene rubber, is a new technical solution that is different from the prior art, and can have excellent aging resistance and good cross-linking performance.

Cross-linking performance includes factors such as crosslink density and cross-linking rate, which is the specific performance of the cross-linking ability of the rubber matrix during processing.

The branched polyethylene used in the present invention preferably has a methyl branch content of 40% or more or 50% or more, and has a certain similarity with the structure of the ethylene propylene diene rubber. In terms of cross-linking ability, the degree of branching (tertiary carbon atom content) and the steric hindrance around the tertiary carbon atom are the two main factors affecting the cross-linking ability of the saturated polyolefin. The branched polyethylene used in the present invention is low in degree of branching relative to the ethylene propylene rubber, and since the branched polyethylene has a branch having a carbon number of not less than 2, the branched polycondensation used in the present invention The steric hindrance around the tertiary carbon atom of ethylene is theoretically larger than that of ethylene propylene rubber. It can be judged by combining two factors that the crosslinking ability of the branched polyethylene used in the present invention should be weaker than that of the ethylene propylene rubber. In EPDM rubber. However, the actual cross-linking ability of the partially branched polyethylene used in the present invention is close to that of EPDM rubber, and may even be equal to or better than EPDM rubber. This means that the rubber composition of the present invention can obtain a good aging resistance, can also not weaken the crosslinking ability, and can even have excellent crosslinking performance to achieve an unexpected beneficial effect.

This may be explained by the fact that there may be an appropriate number of secondary branched structures on the branched polyethylene used in the preferred embodiment of the present invention, and the so-called secondary branched structure refers to a structure in which branches are further branched. This is also known as "branch-on-branch" during chain walking. Because of the low steric hindrance around the tertiary carbon atoms of the secondary branches, cross-linking reactions are more likely to occur. Having a secondary branched structure is a distinct distinction between the branched polyethylene used in the preferred embodiment of the invention and the prior art ethylene dipropylene rubber or the conventional ethylene-α-olefin copolymer.

It is a new technical solution to improve the cross-linking ability of saturated polyolefin elastomer by using the secondary steric structure with lower steric hindrance. Under the technical solution of the present invention, it is also considered to be within the technical protection of the present invention to include a vinyl copolymer having a secondary branched structure or other saturated hydrocarbon polymer in the rubber matrix. The vinyl copolymer refers to a copolymer of ethylene and a branched α-olefin, and has a secondary branched structure, wherein the branched α-olefin may be selected from the group consisting of isobutylene and 3-methyl-1- Butylene, 4-methyl-1-pentene, 3-methyl-1-pentene, 2-methyl-1-heptene, 3-methyl-1-heptene, 4-methyl-1- The heptene, 5-methyl-1-heptene, 6-methyl-1-heptene, and the like, the comonomer may also contain a common linear alpha-olefin.

It is generally believed in the prior art that the branched polyethylene prepared by the (α-diimine) nickel catalyst is difficult to exist in the secondary branched structure, and at least it is difficult to sufficiently distinguish it. The technical solution of the present invention is also to analyze the branched polycondensation. The structure of ethylene provides a new idea.

Compared with ethylene propylene rubber, when the branched polyethylene has an appropriate number of secondary branched structures, the cross-linking point of the branched polyethylene can be generated on the tertiary chain of the main chain during the peroxide crosslinking process. It can also be produced on the branched tertiary carbon of the secondary structure, so the rubber network formed by the cross-linking of the branched polyethylene has a richer CC connecting segment between the main chains than the ethylene-propylene rubber. The length can effectively avoid stress concentration and help to obtain better mechanical properties, including tear strength. On the other hand, better cross-linking ability can effectively increase the cross-linking density, and the molecular weight distribution of the branched polyethylene is close to 2, which is narrower than that of the general ethylene-propylene rubber, so that it is also expected to obtain better compression set resistance.

A further technical solution is that the content of the branched polyethylene is a: 10 ≤ a ≤ 100 parts based on 100 parts by weight of the rubber matrix; the content of the binary ethylene propylene rubber and the ethylene propylene diene rubber is b: 0 ≤ b ≤ 90 Branched polyethylene is an ethylene homopolymer with a degree of branching of 60-130 branches/1000 carbons, a weight average molecular weight of 66,000 to 518,000, and a Mooney viscosity of ML (1+4) at 125 °C. 6 to 102;

A further preferred technical solution for the branched polyethylene is a branching degree of 70 to 116 branches/1000 carbons, a weight average molecular weight of 201,000 to 436,000, and a Mooney viscosity ML (1+4) of 125 ° C of 23 ～. 101;

A further preferred technical solution for the branched polyethylene is a branching degree of 80 to 105 branches/1000 carbons, a weight average molecular weight of 250,000 to 400,000, and a Mooney viscosity of ML (1+4) of 125 ° C of 40 ～. 95.

A further preferred technical solution for branched polyethylene is a branching degree of 80 to 105 branches/1000 carbons, a weight average molecular weight of 268,000 to 356,000, and a Mooney viscosity ML (1+4) of 125 ° C of 42 ～. 80.

A further technical solution is that the third monomer of the ethylene propylene diene monomer is preferably a diene monomer, specifically selected from the group consisting of 5-ethylidene-2-norbornene and 5-vinyl-2-nor Borneene, dicyclopentadiene, 1,4-hexadiene, 1,5-hexadiene, 1,4-pentadiene, 2-methyl-1,4-pentadiene, 3-methyl- 1,4-Hexadiene, 4-methyl-1,4-hexadiene, 1,9-decadiene, 5-methylene-2-norbornene, 5-pentylene-2-nor Borbornene, 1,5-cyclooctadiene, 1,4-cyclooctadiene, and the like. Specifically, the ethylene propylene rubber may contain two or more kinds of diene monomers, such as 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene. The functional group of the diene monomer can play the same role as the intrinsic co-crosslinking agent in the peroxide vulcanization, thereby improving the crosslinking efficiency. This helps to reduce the amount and residual amount of crosslinker and co-crosslinker required and the cost of adding them. The weight specific gravity of the diene monomer to the ethylene propylene rubber is preferably from 1% to 14%, more preferably from 3% to 10%, still more preferably from 4% to 7%.

A further technical solution is that the crosslinking agent comprises at least one of a peroxide crosslinking agent and a sulfur, the peroxide crosslinking agent comprising di-tert-butyl peroxide, dicumyl peroxide, and tert-butyl Kecumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tert-butyl Oxidation) hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, bis(tert-butylperoxyisopropyl)benzene, 2,5-dimethyl At least one of -2,5-bis(benzoyl peroxy)hexane, tert-butyl peroxybenzoate, and t-butylperoxy-2-ethylhexyl carbonate. More preferably, the crosslinking agent is 2 to 6 parts by weight.

A further technical solution is that the short fiber comprises at least one of a polyamide short fiber or a nylon short fiber, and the polyamide short fiber comprises at least one of nylon 6, nylon 66 and nylon 610, wherein the short fiber The length is 1 to 8 mm. In addition to the polyamide short fibers and the aramid short fibers, the short fibers used in the present invention may also be selected from cotton staple fibers, lignin short fibers, ultra high molecular weight polyethylene short fibers, and the like.

According to a further technical proposal, the rubber composition further comprises an auxiliary component, which comprises, in parts by weight, based on 100 parts by weight of the rubber base, comprising: 0.3 to 15 parts of the crosslinking agent and 3 to 25 parts of the metal oxide. 3 to 90 parts of a plasticizer, 30 to 100 parts of a reinforcing filler, 1 to 3 parts of a stabilizer, 3 to 20 parts of a metal salt of an unsaturated carboxylic acid, and 0 to 4 parts of a vulcanization accelerator.

According to a further aspect of the invention, the auxiliary component comprises 0.5 to 5 parts of a co-crosslinking agent, 5 to 20 parts of a metal oxide, 5 to 60 parts of a plasticizer, and 40 to 80 parts of a reinforcing filler. Parts, 1 to 2 parts of a stabilizer, 5 to 15 parts of a metal salt of an unsaturated carboxylic acid, and 0 to 3 parts of a vulcanization accelerator.

A further technical solution is that the co-crosslinking agent comprises triallyl cyanurate, triallyl isocyanurate, triallyl trimellitate, trimethylolpropane trimethacrylate, At least one of ethylene glycol dimethacrylate, N,N'-m-phenylene bismaleimide, N,N'-bis-decylenedone, 1,2-polybutadiene, and sulfur .

In a further technical solution, the metal oxide comprises at least one of zinc oxide, magnesium oxide, and calcium oxide.

A further technical solution is that the plasticizer comprises at least one of pine tar, motor oil, paraffin oil, coumarone, RX-80, naphthenic oil, stearic acid, paraffin wax, liquid ethylene propylene rubber, and liquid polyisobutylene. Among them, stearic acid can also act as an active agent in sulfur-sulfur-based systems, and can form soluble salts with some metal oxides, thereby increasing the activation of metal oxides on promoters. The rational use of plasticizers can increase the flexibility of the compound and the plasticity suitable for process operation. In order to increase the viscosity, it is also preferred to use an adhesion promoter such as pine tar, coumarone, RX-80, liquid polyisobutylene or the like.

In a further technical solution, the reinforcing filler comprises at least one of carbon black, white carbon black, calcium carbonate, calcined clay, magnesium silicate, aluminum silicate, and magnesium carbonate.

A further technical solution is that the amount of carbon black is from 30 to 60 parts by weight based on 100 parts by weight of the rubber base.

A further technical solution is that the stabilizer comprises 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 6-ethoxy-2,2,4-trimethyl-1 At least one of 2-dihydroquinoline (AW), 2-mercaptobenzimidazole (MB), and N-4 (anilinophenyl)maleimide (MC).

In a further aspect, the unsaturated carboxylic acid metal salt comprises at least one of zinc methacrylate, magnesium methacrylate, aluminum methacrylate, and calcium methacrylate.

A further technical solution is that the vulcanization accelerator comprises 2-thiol benzothiazole, dibenzothiazyl disulfide, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethyl disulfide At least one of lam, N-cyclohexyl-2-benzothiazolyl sulfenamide, N,N-dicyclohexyl-2-phenylthiazolyl sulfenamide, bismaleimide, and ethylene thiourea One.

A further technical solution is that the short fibers are preferably pretreated and have good blending properties with non-polar rubber.

In an embodiment of the present invention, in order to improve the viscosity of the rubber compound, the rubber composition may further comprise a tackifier, wherein the plasticizer is pine tar, coumarone resin, RX-80, and liquid polyisobutylene. The role of the adhesive, wherein the liquid coumarone resin has a better viscosity-increasing effect than the solid coumarone resin, and the tackifier may also be selected from the group consisting of C5 petroleum resin, C9 petroleum resin, hydrogenated rosin, terpene resin, alkyl group. A commonly used tackifier such as a phenol resin, a modified alkyl phenol resin, or an alkyl phenol-acetylene resin, and the tackifier is generally not more than 30 parts by weight, further preferably not more than 10 parts by weight, based on 100 parts by weight of the rubber base. It is further preferably not more than 5 parts by weight.

The crosslinking agent, the co-crosslinking agent and the vulcanization accelerator involved in the rubber composition provided by the present invention all belong to a crosslinking system.

The rubber composition of the present invention may be present in the form of an uncrosslinked rubber compound, and may be present in the form of a vulcanized rubber after further crosslinking reaction. Vulcanized rubber can also be referred to simply as vulcanizate.

The present invention also provides a method of processing the above rubber composition, the processing method comprising the steps of:

(1) setting the temperature of the internal mixer and the rotation speed of the rotor, and sequentially adding the components other than the crosslinking system in the rubber composition to the mixer to be kneaded; then adding a crosslinking system, and then discharging the rubber after mixing, wherein The crosslinking system comprises a crosslinking agent, and may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

(2) The rubber compound obtained in the step (1) is thinned on the open mill by a roller not more than half the length of the short fiber used, and then the roll gap is enlarged, and then the film is placed and parked;

(3) The kneaded film obtained in the step (2) is cut into a cavity of the mold, heated and vulcanized on a flat vulcanizer, and then released to obtain a vulcanized rubber. In order to improve the compression set resistance of the vulcanizate, it is further possible to carry out vulcanization using a two-stage vulcanization process.

The present invention also provides a power transmission belt comprising: a body having a length including a cushion rubber layer and a compression rubber layer, the compression rubber layer comprising the above rubber composition. The cushion rubber layer may be the same rubber base as the compression rubber layer, and the cushion rubber layer may or may not contain the above short fibers, and is preferably free of short fibers in order to improve the adhesive property.

The load-carrying core wire in the buffer rubber layer preferably has a variety of high strength and low elongation, and may be specifically selected from the group consisting of polyester fiber, aramid fiber, glass fiber, ultra high molecular weight polyethylene fiber, etc., and the polyester fiber may be selected from the group consisting of poly Aryl ester fibers, polybutylene terephthalate fibers, polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, polyethylene naphthalate fibers, and the like. Preferably, the above-mentioned carrier core wire is subjected to a bonding treatment to improve the adhesion property of the carrier core wire to the rubber, and the bonding can be performed by dipping the carrier core wire into a treatment solution such as resorcinol formaldehyde latex (PFL impregnation liquid) and heating and drying. .

The power transmission belt provided by the invention further comprises a reinforcing fabric, generally located outside the cushion rubber layer, which can be used for plain weave or oblique of cotton fiber, polyester fiber, aramid fiber, polyamide fiber, ultra high molecular weight polyethylene fiber, and the like. For the woven fabric, the satin weave fabric or the like, a rubber canvas coated with a rubber composition and subjected to RFL treatment is preferably used as the reinforcing fabric.

The power transmission belt of the present invention is not limited to the above configuration. For example, a V-ribbed belt of an unbuffered rubber layer, a V-belt provided with a back rubber layer instead of a reinforcing fabric, and a rubber exposed to the back of the belt are also included in the technical scope of the present invention.

A further technical solution for the power transmission belt is that the compression rubber layer further comprises 10 to 80 parts by weight of a solid lubricant based on 100 parts by weight of the rubber matrix, wherein the solid lubricant comprises graphite, mica, molybdenum disulfide and polytetrafluoroethylene. At least one of them is further preferably 10 to 60 parts by weight.

The present invention also provides a method of producing a power transmission belt, the production method comprising the following steps when the power transmission belt is a V-ribbed belt:

(1) Rubber kneading: the kneading of the rubber layer of the compression rubber is: mixing the rubber substrate and the short fiber in an internal mixer for 120 to 140 seconds, so that the short fibers are sufficiently dispersed into the rubber matrix; The remaining components other than the cross-linking system are kneaded for 150 to 240 seconds; after thorough mixing, the rubber is discharged to obtain a mixed masterbatch. After the mixture is allowed to stand at room temperature for not less than 24 hours, it is placed on the roller of the open mill. After the surface of the master rubber roll is smooth, a cross-linking system is added. After the above-mentioned compounding agent is mixed into the masterbatch, the mold is refining and the compound is added. After the thin pass, the film is left at room temperature for a period of time, the crosslinking system comprises a crosslinking agent, and may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

The buffer rubber layer rubber does not contain short fibers, and the mixing process is: setting the temperature of the internal mixer and the rotation speed of the rotor, and kneading the rubber substrate in an internal mixer for 60 to 120 seconds to remove cross-linking of the rubber composition used. The components other than the system are sequentially added to the internal mixer for mixing; then the crosslinking system is added, the rubber is mixed after the mixing, and the rubber mixture is thinly passed through the open mill, parked and tested;

(2) Molding: using the reverse molding method, first hang the optical mold on the molding machine, clean the mold, apply a small amount of release agent, and after volatilizing it, wrap the V-ribbed top cloth (reinforcing fabric) on the optical mold, and then Packing the buffer layer rubber, correcting the tension of the rope, flattening the strength layer and then wrapping the buffer rubber, and finally wrapping the wedge rubber to the outer circumference required by the molding process to obtain the strip;

(3) Vulcanization: The vulcanized vulcanization process is used to feed the strip into the vulcanization tank for vulcanization. The vulcanization temperature is 155-175 ° C, the internal pressure is 0.45-0.55 MPa, the external pressure is 1.0-1.2 MPa, and the vulcanization time is 25-30. minute;

(4) Post-treatment: After the vulcanization is finished, the mold is cooled and released, and the belt is sent to the cutting process, and the width is cut according to the required width, the back is rubbed, the wedge is trimmed, and the finished product is obtained after inspection by trimming.

The transmission belt produced by using the rubber composition provided by the present invention as a compression layer rubber compound includes, but is not limited to, the following types: a cloth-type ordinary V-belt, a cloth-type narrow V-belt, a cloth-type joint belt, and a cloth-type agricultural belt. , hexagonal belt, trimming V belt, trimming narrow V belt, trimming type V belt, trimming type mechanical variable speed V belt, trimming industrial variable speed V belt, motorcycle speed V belt.

The present invention also provides a conveyor belt having at least one of a working surface covering rubber and a non-working surface covering rubber comprising the above rubber composition.

The present invention also provides a method of producing a conveyor belt, the work surface covering glue of the conveyor belt comprising the above rubber composition, comprising the steps of:

(1) Rubber mixing: set the temperature of the internal mixer and the rotor speed, then mix the rubber matrix and short fibers in an internal mixer for 120-140 seconds to fully disperse the short fibers into the rubber matrix; The other components except the cross-linking system are kneaded for 150 to 240 seconds; after thorough mixing, the rubber is discharged to obtain a mixed masterbatch. After the mixture is allowed to stand at room temperature for not less than 24 hours, it is placed on the roller of the open mill. After the surface of the master rubber roll is smooth, a cross-linking system is added. After the above-mentioned compounding agent is mixed into the masterbatch, the mold is refining and the compound is added. After the thin pass, the film is left at room temperature for a while. Wherein the crosslinking system comprises a crosslinking agent, and may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

(2) calendering process: the film obtained in the step (1) is placed in a screw extruder for hot refining, and then supplied to a calender for calendering and heat preservation for use;

(3) Molding process: the film is closely attached to the pre-formed adhesive canvas strip blank on the forming machine to form a strip of high temperature resistant conveyor belt, and then rolled up for waiting for vulcanization;

(4) placing the formed conveyor belt blank into a flat vulcanizing machine for segmental vulcanization;

(5) After the vulcanization is finished, it is trimmed, inspected, and then packaged into the warehouse.

The present invention also provides a rubber roller comprising the above rubber composition.

The invention also provides a method of producing a rubber roller comprising the steps of:

(1) Rubber mixing: set the temperature of the internal mixer and the rotor speed, then mix the rubber matrix and short fibers in an internal mixer for 120-140 seconds to fully disperse the short fibers into the rubber matrix; The other components except the cross-linking system are kneaded for 150 to 240 seconds; after thorough mixing, the rubber is discharged to obtain a mixed masterbatch. After the mixture is allowed to stand at room temperature for not less than 24 hours, it is placed on the roller of the open mill. After the surface of the master rubber roll is smooth, a cross-linking system is added. After the above-mentioned compounding agent is mixed into the masterbatch, the mold is refining and the compound is added. After the thin pass, the film is left at room temperature for 12 hours, and then the strip is cut to obtain the final strip. Wherein the crosslinking system comprises a crosslinking agent, and may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

(2) Wrap-wrapping: The strip obtained in step (1) is put into a screw extruder, and the film of thickness and width required by the extrusion process is to be uniform after the film is started, and the film is wound around the metal roll. On the core, the rubber is wrapped layer by layer until the thickness of the rubberized single side reaches a predetermined thickness, and then 2-3 layers of nylon water cloth are wound on the rubber surface to obtain a rubberized rubber roll;

(3) vulcanization tank vulcanization, the rubberized rubber roller is sent to the vulcanization tank, after closing the tank door, steam is vulcanized into the vulcanization tank, and the compressed air valve is opened while steam is introduced, and the compressed air is passed to vulcanize. The pressure in the tank reaches 4.5 to 5 atmospheres in 0.5 hours; the vulcanization procedure is: firstly heat up to 70-80 ° C, keep warm for 2 hours; then heat up to 100-110 ° C, keep warm for 0.5 hours; then heat up to 120-130 ° C, keep warm 0.5 hours; then heat up to 135-140 ° C, heat 8 ~ 10 hours, the end of vulcanization, open the exhaust valve, pressure drop, when the pressure gauge pointer points to zero, open the safety pin, and the steam hole in the pin hole, half Open the vulcanization tank and let the temperature drop. When the temperature inside the tank is lower than 60 ° C or equivalent to the room temperature, the rubber roller is pulled out;

(4) Post-treatment: The vulcanized rubber roller is rough-processed on a lathe, and then finished on a grinding machine for inspection and inspection to obtain a finished product.

The rubber composition provided by the invention can also be used for producing short fiber reinforced hoses, rubber sheets, solid tire base glues and the like.

Compared with the prior art, the invention has the beneficial effects that the heat aging resistance of the rubber composition containing the branched polyethylene is maintained at the same level as that of the rubber composition of the ethylene propylene rubber alone, or has a slight advantage and can satisfy At present, short-fiber reinforced power transmission belts, conveyor belts and rubber rollers are required for high temperature resistance. Moreover, under the same or similar conditions of other formula ingredients, the rubber composition containing branched polyethylene has higher mechanical strength, and can solve the problem that the rubber composition with ethylene-propylene rubber as the main rubber component is peroxidized to some extent. The problem of low mechanical strength under the vulcanization system.

detailed description

The rubber composition of the present invention and its application are further described below in conjunction with the embodiments. The following examples are merely illustrative of the technical solutions and are not intended to limit the invention. All parts which are not specifically described in the examples are parts by weight.

In order to more clearly describe the embodiments of the present invention, the materials to which the present invention relates are defined below.

The crosslinking system contains a crosslinking agent, and may further contain at least one of a co-crosslinking agent and a vulcanization accelerator.

In the embodiment of the present invention, the aramid short fiber is made of para-aramid, and the nylon short fiber is made of nylon 66.

The Mooney viscosity ML (1+4) of the ethylene propylene rubber used is preferably 30 to 50 at 125 ° C, and the ethylene content is preferably 45% to 60%. The Mooney viscosity ML (1+4) of the ethylene propylene diene rubber used is preferably 20 to 100, more preferably 30 to 70, the ethylene content is preferably 50% to 75%, and the third monomer is 5-ethylene-2. - norbornene, 5-vinyl-2-norbornene or dicyclopentadiene, the third monomer content being from 1% to 7%.

The branched polyethylene used can be obtained by catalyzing the homopolymerization of ethylene by a (α-diimine) nickel catalyst under the action of a cocatalyst. The structure, synthesis method and method for preparing branched polyethylene by using the (α-diimine) nickel catalyst are disclosed in the prior art, and can be used but are not limited to the following documents: CN102827312A, CN101812145A, CN101531725A, CN104926962A, US6103658, US6660677.

The selected branched polyethylene is characterized by a branching degree of 60 to 130 branches/1000 carbons, a weight average molecular weight of 66,000 to 518,000, and a Mooney viscosity of ML (1+4) of 125 ° C of 6 to 102. . Among them, the degree of branching is measured by nuclear magnetic resonance spectroscopy, and the molar percentages of various branches are measured by nuclear magnetic carbon spectroscopy.

Specifically as shown below:

Rubber performance test method:

1. Hardness test: According to the national standard GB/T 531.1-2008, the test is carried out with a hardness tester, and the test temperature is room temperature;

2, tensile strength, elongation at break performance test: in accordance with the national standard GB/T528-2009, using an electronic tensile testing machine for testing, the tensile speed is 500mm / min, the test temperature is 23 ± 2 ° C, the sample is type 2 Dumbbell sample

3, tear strength test: in accordance with the national standard GB/T529-2008, using an electronic tensile test machine for testing, the tensile speed is 500mm / min, the test temperature is 23 ± 2 ° C, the sample is a rectangular sample;

4, DIN abrasion test: according to the national standard GB/T9867-1998, using a roller wear machine, the preparation of cylindrical vulcanizate sample, sample diameter, 16 ± 0.2mm, height of 8mm, test temperature 23 ± 2 ° C;

5, Mooney viscosity test: in accordance with the national standard GB/T1232.1-2000, with Mooney viscosity meter for testing, the test temperature is 125 ° C, preheat 1 minute, test 4 minutes;

6, hot air accelerated aging test: in accordance with the national standard GB/T3512-2001, in the heat aging test chamber, the test conditions are 150 ° C × 72h;

7. Positive curing time Tc90 test: According to the national standard GB/T16584-1996, it is carried out in a rotorless vulcanizer, and the test temperature is 160 °C.

The vulcanization conditions of the following Examples 1 to 13 and Comparative Examples 1 and 2 were as follows: temperature: 160 ° C; pressure: 16 MPa; time was Tc90 + 2 min.

Example 1:

The branched polyethylene used was numbered PER-9.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the mixer to 100 ° C, the rotor speed is 50 rpm, add 90 parts of EPDM rubber and 10 parts of branched polyethylene for 90 seconds; add 10 parts of oxidation Zinc, 2 parts of stearic acid, 1 part of antioxidant RD, kneaded for 1 minute; then, 60 parts of carbon black N330, 20 parts of paraffin oil SUNPAR 2280 and 5 parts of liquid ethylene propylene rubber were added to the compound, and kneaded for 3 minutes; Then add 5 parts of aramid staple fiber with a length of 1mm and mix for 2 minutes; finally add 4 parts of cross-linking agent dicumyl peroxide (DCP), 1 part of cross-linking agent triallyl isocyanurate (TAIC) and 0.3 parts of sulfur, mixed for 2 minutes and then discharged. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 2:

The branched polyethylene used was numbered PER-2.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 80 parts of ethylene propylene diene rubber and 20 parts of branched polyethylene for 90 seconds; add 10 parts of oxidation Zinc, 2 parts of stearic acid, 1 part of antioxidant RD, kneaded for 1 minute; then, 60 parts of carbon black N330, 20 parts of paraffin oil SUNPAR 2280 and 5 parts of liquid ethylene propylene rubber were added to the compound, and kneaded for 3 minutes; Then add 5 parts of aramid staple fiber with a length of 1mm and mix for 2 minutes; finally add 4 parts of cross-linking agent dicumyl peroxide (DCP), 1 part of cross-linking agent triallyl isocyanurate (TAIC) and 0.3 parts of sulfur, mixed for 2 minutes and then discharged. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 3:

The branched polyethylene used was numbered PER-4.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 50 parts of ethylene propylene rubber and 50 parts of branched polyethylene for 90 seconds; add 10 parts of oxidation Zinc, 2 parts of stearic acid, 1 part of antioxidant RD, mixed for 1 minute; then add 60 parts of carbon black N330, 15 parts of paraffin oil SUNPAR2280, 5 parts of coumarone resin and 5 parts of liquid ethylene propylene rubber to the rubber compound , mixing for 3 minutes; then adding 5 parts of aramid staple fiber of length 1mm, mixing for 2 minutes; finally adding 4 parts of cross-linking agent dicumyl peroxide (DCP), 1 part of cross-linking agent triene The base isocyanurate (TAIC) and 0.3 parts of sulfur were mixed for 2 minutes and then discharged. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 4:

The branched polyethylene used was numbered PER-5.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor rotation speed is 50 rpm, add 100 parts of branched polyethylene pre-pressure mixing for 90 seconds; add 10 parts of zinc oxide, 2 parts of stearic acid, 1 part of antioxidant RD, mixing for 1 minute; then add 60 parts of carbon black N330, 20 parts of paraffin oil SUNPAR2280 and 5 parts of liquid ethylene propylene rubber to the compound, mix for 3 minutes; then add 5 parts of 1mm length Short staple fiber, mixed for 2 minutes; finally added 4 parts of cross-linking agent dicumyl peroxide (DCP), 1 part of cross-linking agent triallyl isocyanurate (TAIC) and 0.3 parts of sulfur, mixed After 2 minutes of smelting, the glue is discharged. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 5:

The branched polyethylene used was numbered PER-3.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor rotation speed is 50 rpm, add 100 parts of branched polyethylene pre-pressure mixing for 90 seconds; add 5 parts of zinc oxide, 1.5 parts of stearic acid, 1 part of antioxidant RD and 2 parts of polyethylene glycol PEG4000, knead for 1 minute; then add 100 parts of carbon black N330, 30 parts of paraffin oil SUNPAR2280 to the compound, knead for 3 minutes; then add 12 parts of length 1mm Aramid staple fiber, mixed for 2 minutes; finally added 9 parts of cross-linking agent dicumyl peroxide (DCP), 2 parts of cross-linking agent triallyl isocyanurate (TAIC), 10 parts of liquid 1 , 2-polybutadiene and 5 parts of zinc methacrylate, and kneaded for 2 minutes and then discharged. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 6

The branched polyethylene used was numbered PER-5.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 20 parts of ethylene propylene diene rubber, 50 parts of ethylene propylene diene monomer and 30 parts of branched polyethylene pre-pressure mixing. 90 seconds; add 20 parts of zinc oxide, 5 parts of magnesium oxide, 2 parts of stearic acid, 1 part of antioxidant RD, knead for 1 minute; then add 50 parts of carbon black N330, 10 parts of paraffin oil SUNPAR 2280 and 5 parts of liquid ethylene-propylene rubber, mixing for 3 minutes; then adding 6 parts of aramid staple fiber of length 1mm, mixing for 2 minutes; finally adding 6 parts of cross-linking agent dicumyl peroxide (DCP) and 2 parts of help The cross-linking agent, triallyl isocyanurate (TAIC), was kneaded for 2 minutes, and the rubber was discharged on a mill with a roll temperature of 80 ° C, and the thin pass was made at a roll gap of 0.5 mm. Then, the short fibers were sufficiently oriented, and the sheet thickness of about 2.5 mm was obtained by enlarging the roll distance, and parked for 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

Comparative Example 1:

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 100 parts of ethylene-propylene rubber pre-pressure mixing for 90 seconds; add 10 parts of zinc oxide, 2 parts of stearic acid 1 part of antioxidant RD, mixing for 1 minute; then add 60 parts of carbon black N330, 20 parts of paraffin oil SUNPAR2280 and 5 parts of liquid ethylene propylene rubber to the compound, knead for 3 minutes; then add 5 parts of length 1mm Aramid staple fiber, mixed for 2 minutes; finally added 4 parts of cross-linking agent dicumyl peroxide (DCP), 1 part of cross-linking agent triallyl isocyanurate (TAIC) and 0.3 parts of sulfur, After mixing for 2 minutes, the rubber was drained, and the rubber mixture was thinly passed on an open mill with a roll temperature of 80 ° C, and thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll pitch was enlarged to obtain a thickness of about 2.5 mm. The sheet is placed under the sheet and parked for 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

The performance test data of Examples 1 to 6 and Comparative Example 1 are as follows:

From the comparison of the properties of Examples 1 to 4 and Comparative Example 1, it can be seen that as the content of branched polyethylene is increased, the tensile strength is gradually increased, and the heat aging property is always maintained.

Example 7

The branched polyethylene used was numbered PER-8.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 90 parts of EPDM rubber, 10 parts of branched polyethylene pre-pressure mixing for 90 seconds; add 6 parts of oxidation Zinc, 1 part stearic acid, 2 parts of antioxidant RD, kneaded for 1 minute; then add 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR 2280 and 5 parts of coumarone resin to the compound, and mix for 3 minutes; Add 30 parts of nylon short fiber with a length of 1mm and mix for 2 minutes; finally add 4 parts of cross-linking agent dicumyl peroxide (DCP) and 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC) After 2 minutes of mixing, the rubber is discharged, and the rubber mixture is thinly passed on an open mill with a roll temperature of 80 ° C, and thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll pitch is enlarged to obtain 2.5 mm. The left and right thickness sheets are placed under the sheet for 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

Example 8

The branched polyethylene used was numbered PER-7.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 70 parts of EPDM rubber, 30 parts of branched polyethylene pre-pressed and kneaded for 90 seconds; add 6 parts of oxidation Zinc, 1 part stearic acid, 2 parts of antioxidant RD, kneaded for 1 minute; then add 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR 2280 and 5 parts of coumarone resin in the compound, and mix for 3 minutes; Add 30 parts of nylon short fiber with a length of 1mm and mix for 2 minutes; finally add 1 part of cross-linking agent dicumyl peroxide (DCP), 0.3 parts of cross-linking agent triallyl isocyanurate (TAIC) ), 0.5 parts of cross-linking agent sulfur, 1.5 parts of N-cyclohexyl-2-benzothiazole sulfenamide (CZ) and 1 part of tetramethyl thiuram disulfide (TMTD), after 2 minutes of mixing The kneaded rubber is thinly passed on an open mill with a roll temperature of 80 ° C, and is thinned 7 times at a roll gap of 0.5 mm to sufficiently orient the short fibers, and the roll is obtained by enlarging the roll to obtain a thickness of about 2.5 mm. hour.

(2) After the vulcanization, the test was carried out for 16 hours.

Example 9

The branched polyethylene used was numbered PER-6.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 70 parts of ethylene propylene rubber, 30 parts of branched polyethylene pre-pressure mixing for 90 seconds; add 6 parts of oxidation Zinc, 1 part stearic acid, 2 parts of antioxidant RD, kneaded for 1 minute; then add 60 parts of carbon black N330, 5 parts of paraffin oil SUNPAR 2280 and 5 parts of coumarone resin in the compound, and mix for 3 minutes; Add 10 pieces of nylon short fiber with a length of 1mm and mix for 2 minutes; finally add 2 parts of cross-linking agent dicumyl peroxide (DCP), 0.5 part of cross-linking agent sulfur and 15 parts of magnesium methacrylate, mix 2 After the minute, the rubber was discharged, and the rubber mixture was thinly passed on an open mill with a roll temperature of 80 ° C, and thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll was enlarged to obtain a thickness of about 2.5 mm. Tablet, park for 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

Example 10:

The branched polyethylene used was numbered PER-6.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 50 parts of ethylene propylene diene rubber, 50 parts of branched polyethylene pre-pressed and kneaded for 90 seconds; add 6 parts of oxidation Zinc, 1 part stearic acid, 2 parts of antioxidant RD, mixed for 1 minute; then add 45 parts of carbon black N330, 20 parts of polytetrafluoroethylene, 5 parts of paraffin oil SUNPAR 2280 and 5 parts of coumarone resin , mixing for 3 minutes; then adding 20 parts of nylon short fibers of 1 mm length, mixing for 2 minutes; finally adding 4 parts of cross-linking agent dicumyl peroxide (DCP) and 1.5 parts of co-crosslinker triallyl Isocyanurate (TAIC), after 2 minutes of mixing, the rubber is discharged, and the rubber mixture is thinly passed on an open mill with a roll temperature of 80 ° C, and thinned 7 times at a roll gap of 0.5 mm to make the short fibers fully oriented. The sheet was obtained by enlarging the roll to obtain a sheet thickness of about 2.5 mm and parked for 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

Example 11

The branched polyethylene used was numbered PER-5.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the mixer to 90 ° C, the rotor speed is 50 rpm, add 30 parts of EPDM rubber, 70 parts of branched polyethylene pre-pressed for 90 seconds; add 6 parts of oxidation Zinc, 1 part stearic acid, 2 parts of antioxidant RD, kneaded for 1 minute; then add 30 parts of carbon black N330, 5 parts of paraffin oil SUNPAR 2280 and 5 parts of coumarone resin in the compound, and mix for 3 minutes; Add 60 parts of nylon short fiber with a length of 1mm and mix for 2 minutes; finally add 8 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC) And 10 parts of magnesium methacrylate, mixed for 2 minutes and then discharged. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 12

The branched polyethylenes used were numbered PER-1 and PER-7.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rpm, add 20 parts of PER-1 and 80 parts of PER-7 pre-pressure mixing for 90 seconds; add 6 parts of zinc oxide, 1 Stearic acid, 2 parts of antioxidant RD, mixing for 1 minute; then add 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280 and 5 parts of coumarone resin in the compound, mix for 3 minutes; then add 20 parts Nylon staple fiber of 1 mm length, kneaded for 2 minutes; finally added 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.3 parts of cross-linking agent triallyl isocyanurate (TAIC), 0.2 The cross-linking agent sulfur and 7 parts of zinc methacrylate were mixed and mixed for 2 minutes. The kneaded rubber was thinly passed on an open mill with a roll temperature of 80 ° C, and was thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap was obtained to obtain a sheet thickness of about 2.5 mm and parked for 20 hours. .

(2) After the vulcanization, the test was carried out for 16 hours.

Example 13

The branched polyethylene used was numbered PER-5.

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the internal mixer to 90 ° C, the rotor rotation speed is 50 rev / min, add 100 parts of branched polyethylene pre-pressure mixing for 90 seconds; add 6 parts of zinc oxide, 1 part of stearic acid, 2 parts of antioxidant RD, mixing for 1 minute; then add 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280 and 5 parts of coumarone resin in the compound, mix for 3 minutes; then add 20 parts of nylon with a length of 1mm Short fiber, kneaded for 2 minutes; finally added 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC), mixing for 2 minutes Glue, the rubber compound is thinly passed on the open mill with a roll temperature of 80 ° C, and is thinned 7 times at a roll gap of 0.5 mm to make the short fibers fully oriented, and the roll gap is obtained to obtain a thickness of about 2.5 mm. 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

Comparative Example 2:

The processing steps are as follows:

(1) Rubber mixing: set the temperature of the mixer to 90 ° C, the rotor speed is 50 rpm, add 100 parts of EPDM rubber, pre-press and knead for 90 seconds; add 6 parts of zinc oxide, 1 part of stearin Acid, 2 parts of antioxidant RD, kneaded for 1 minute; then add 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280 and 5 parts of coumarone resin in the compound, mix for 3 minutes; then add 20 parts of length 1mm Nylon staple fiber, kneaded for 2 minutes; finally add 4 parts of cross-linking agent dicumyl peroxide (DCP) and 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC), mixing for 2 minutes After the rubber is glued, the rubber compound is thinly passed on the open mill with a roll temperature of 80 ° C, and is thinned 7 times at a roll gap of 0.5 mm to fully orient the short fibers, and the roll gap is obtained to obtain a thickness of about 2.5 mm. , park for 20 hours.

(2) After the vulcanization, the test was carried out for 16 hours.

The performance test data of Examples 7 to 13 and Comparative Example 2 are as follows:

Wherein the L direction is the orientation direction of the short fibers, and the T direction is the orientation direction of the vertical short fibers.

From the comparison of the properties of Examples 7 to 13 and Comparative Example 2, it can be seen that as the content of the branched polyethylene increases, the tensile strength and the tear strength of the vulcanized rubber increase remarkably, and the heat aging property is always maintained.

Example 14

A short fiber reinforced high temperature resistant conveyor belt, the production method comprising the following steps:

The conveyor belt is provided with a cored tensile canvas between the working surface covering glue and the non-working surface covering glue, which makes them a solid whole through molding and vulcanization process.

The composition and ratio of the working surface covering glue according to the embodiment of the invention are calculated in parts:

(1) Rubber mixing process:

Set the temperature of the internal mixer to 90 ° C, the rotor speed to 50 rpm, add 100 parts of branched polyethylene PER-5 and 6 parts of aramid short fiber of 1 mm length, pre-press and knead for 120 seconds; add 15 parts of oxidation Zinc, 2 parts of stearic acid, 1 part of antioxidant RD, kneaded for 1 minute; then add 60 parts of carbon black N330, 20 parts of paraffin oil SUNPAR2280 and 5 parts of liquid ethylene-propylene rubber to the rubber compound, and mix for 3 minutes. Glue; obtained masterbatch; after cooling for 5 hours, the masterbatch was added to the internal mixer for two-stage mixing, pre-pressed and kneaded for 30 seconds, and then added 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 The cross-linking agent, triallyl isocyanurate (TAIC), 0.3 parts of the cross-linking agent sulfur and 5 parts of zinc methacrylate, were mixed for 2 minutes and then degreased to obtain a final gel for use.

(2) Calendering process:

The above rubber mixture is placed in a screw extruder for hot refining, and then supplied to a calender for calendering to be used. When the film is rolled out, the thickness of the film is controlled at 4.5 to 12 mm, and it is kept warm after use. When the film is released, the aramid staple fibers in the rubber compound are longitudinally aligned.

(3) Molding process:

The film is closely attached to the pre-formed appliqué canvas strip on the molding machine to form a strip of the high temperature resistant conveyor belt, which is then vulcanized after being rolled up for 4 hours.

(4) Vulcanization process:

The formed conveyor belt blank was placed in a flat vulcanizing machine for stage vulcanization, and the vulcanization time per plate was 25 minutes, the vulcanization pressure was 3 MPa, and the vulcanization temperature was 160 °C.

(5) Trimming and inspection:

After the vulcanization is finished, it is trimmed, inspected, and then packaged into the warehouse.

Example 15

A high temperature resistant V-ribbed belt, the compression layer of which uses the rubber composition provided by the present invention, and the production method comprises the following steps:

(1) Rubber mixing:

Compressed rubber layer compound mixing: set the temperature of the internal mixer to 90 ° C, the rotor speed is 50 rev / min, add 100 parts of branched polyethylene PER-4 and 20 parts of nylon short fiber of length 1mm, pre-compression mixing 140 seconds; adding 6 parts of zinc oxide, 1 part of stearic acid, 2 parts of antioxidant RD and 5 parts of coumarone resin, mixing for 1 minute; then adding 45 parts of carbon black N330 and 5 parts of paraffin oil SUNPAR2280 After mixing for 3 minutes, the glue is discharged. After mixing the masterbatch for at least 24 hours at room temperature, place it on the roll of the mill. After the surface of the master roll is smooth, add 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of help. The combined triallyl isocyanurate (TAIC), 10 parts of the cross-linking agent zinc methacrylate and 0.3 parts of the cross-linking agent sulfur are mixed for 3 minutes, and the above compounding agent is mixed into the masterbatch and then opened. Refining, and then the rubber compound is thinned, thinned 7 times at a roll gap of 0.5 mm, so that the short fibers are fully oriented, the roll is enlarged, and the film is placed for 24 hours;

Cushion rubber layer compound mixing: set the internal temperature of the mixer to 90 ° C, the rotor speed is 40 rev / min, add 100 parts of branched polyethylene PER-4 pre-pressure mixing for 90 seconds; then add 6 parts of zinc oxide, 2 An antioxidant RD and 1 part stearic acid and 5 parts of coumarone resin, mixing for 1 minute; adding 55 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, mixing for 3 minutes; finally adding 4 parts of cross-linking agent peroxidation Dicumyl (DCP), 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC), 10 parts of cross-linking agent zinc methacrylate and 0.3 parts of cross-linking agent sulfur, mixing for 2 minutes Rear glue. After the thin open on the open mill, the film is left for 24 hours.

(2) Forming:

Reverse molding is used. Firstly, the optical mold is hung on the molding machine, the mold is cleaned, and a small amount of release agent is applied. After it is volatilized, the V-ribbed top cloth is wrapped on the optical mold, and then the buffer rubber layer is wrapped to correct the tension of the rope and level. After wrapping the strength layer, the buffer rubber layer is wrapped, and finally the compression rubber layer (wedge rubber) is wrapped to the outer circumference required for the molding process to obtain a strip.

(3) Vulcanization:

The strip is sent to a vulcanization section for vulcanization, the vulcanization temperature is 160 ° C, the internal pressure is 0.45-0.55 MPa, the external pressure is 1.0-1.2 MPa, and the vulcanization time is 30 minutes.

(4) Post-processing:

After the vulcanization is finished, the mold is cooled and the belt is sent to the cutting process, and the width is cut as required. Grinding the back, grinding the wedge, and trimming the product to obtain the finished product.

Example 16:

A high-temperature resistant V-belt obtained by kneading, calendering, molding, cutting, wrapping, vulcanizing, and cooling, and the compression laminating rubber is obtained by kneading the rubber composition described in Examples 7 to 13.

Example 17

A high temperature resistant rubber roller using the rubber composition provided by the invention, the production method comprising the following steps:

(1) Rubber mixing: set the temperature of the internal mixer to 100 ° C, the rotor speed is 50 rpm, and then mix 100 parts of branched polyethylene PER-5 and 7 parts of aramid short fibers in an internal mixer. After smelting for 130 seconds, the short fibers are fully dispersed into the rubber matrix; then 6 parts of zinc oxide, 2 parts of antioxidant RD and 1 part of stearic acid and 5 parts of coumarone resin are added and kneaded for 1 minute; 55 parts of carbon black are added. N330, 5 parts of paraffin oil SUNPAR2280, after 3 minutes of mixing, the rubber is discharged, and the mixed masterbatch is allowed to stand at room temperature for not less than 24 hours, and then placed on the roller of the open mill. After the surface of the master roll is smooth, 4 parts are added. A mixture of dicumyl peroxide (DCP), 1.5 parts of a cross-linking agent triallyl isocyanurate (TAIC), 10 parts of a cross-linking agent zinc methacrylate and 0.3 parts of a cross-linking agent sulfur, After mixing for 3 minutes, after all the above-mentioned compounding agents are mixed into the masterbatch, the mold is tempered, and the rubber material is thinned and then discharged, and the film is left at room temperature for 12 hours and then cut into strips to obtain a final rubber strip.

(2) Wrap-wrapping: The strip obtained in step (1) is put into a screw extruder, and the film of thickness and width required by the extrusion process is started. After the film is uniform, the rotating wrapping machine is started, and the film is wrapped in preparation. On the metal roll core, the rubber is wrapped layer by layer until the thickness of the rubberized single side reaches a predetermined thickness, and then 2 to 3 layers of nylon water cloth are wound on the rubber surface to obtain a rubberized rubber roll.

(3) vulcanization tank vulcanization, the rubberized rubber roller is sent to the vulcanization tank, after closing the tank door, steam is vulcanized into the vulcanization tank, and the compressed air valve is opened while steam is introduced, and the compressed air is passed to vulcanize. The pressure in the tank reaches 4.5 to 5 atmospheres in 0.5 hours; the vulcanization procedure is: firstly heat up to 70-80 ° C, keep warm for 2 hours; then heat up to 100-110 ° C, keep warm for 0.5 h; then heat up to 120-130 ° C, keep warm 0.5 hours; further increase to 135 ~ 140 ° C, heat 8 ~ 10 hours. After the vulcanization is finished, the exhaust valve is opened, the pressure drops, and when the pressure gauge pointer points to zero, the safety pin is opened, and the steam is discharged from the pin hole, and the vulcanization tank is half-opened to lower the temperature until the temperature in the tank is lower than 60 ° C or Pull out the rubber roller when it is equivalent to room temperature;

(4) Post-treatment: The vulcanized rubber roller is rough-processed on a lathe, and then finished on a grinding machine for inspection and inspection to obtain a finished product.

Example 18

The invention discloses a short fiber reinforced high temperature resistant conveyor belt, and the mixing process of the working surface covering glue is as follows:

Set the temperature of the mixer to 90 ° C, the rotor speed to 50 rpm, add 100 parts of branched polyethylene PER-12 and 20 parts of nylon short fiber of 1 mm length, pre-press and mix for 120 seconds; add 10 parts of zinc oxide , 1.5 parts of stearic acid, 3 parts of coumarone, 2 parts of modified alkyl phenolic resin TKM-M, 1 part of antioxidant RD, kneaded for 1 minute; then add 60 parts of carbon black N330, 20 parts to the compound Paraffin oil SUNPAR2280 and 5 parts of liquid ethylene-propylene rubber, after 3 minutes of mixing, the rubber is discharged; the masterbatch is obtained; after cooling for 5 hours, the masterbatch is added to the internal mixer for two-stage mixing, pre-press mixing for 30 seconds, and then Add 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC), 0.3 parts of cross-linking agent sulfur and 5 parts of zinc methacrylate. After 2 minutes of mixing, the glue is discharged and parked for use.

The remaining steps of the production method are identical to those of the embodiment 14.

Example 19

A high temperature resistant V-ribbed belt, the compression layer of which uses the rubber composition provided by the present invention, and the mixing step of the compression layer rubber and the buffer layer rubber is as follows:

Compressed rubber layer compound mixing: set the internal temperature of the mixer to 90 ° C, the rotor speed is 50 rev / min, add 100 parts of branched polyethylene PER-12 and 20 parts of nylon short fibers of length 1mm, pre-compression mixing 140 seconds; add 6 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant MB and 5 parts of coumarone resin, mix for 1 minute; then add 45 parts of carbon black N330 in the compound And 5 parts of paraffin oil SUNPAR2280, mixed for 3 minutes and then discharged. After mixing the masterbatch for at least 24 hours at room temperature, place it on the roll of the mill. After the surface of the master roll is smooth, add 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of help. The combined triallyl isocyanurate (TAIC), 5 parts of the cross-linking agent zinc methacrylate and 0.3 parts of the cross-linking agent sulfur are mixed for 3 minutes, and the above compounding agent is mixed into the masterbatch and then opened. Refining, and then the rubber compound is thinned, thinned 7 times at a roll gap of 0.5 mm, so that the short fibers are fully oriented, the roll is enlarged, and the film is placed for 24 hours;

Cushion rubber layer compound mixing: set the mixer temperature to 90 ° C, the rotor speed is 40 rev / min, add 100 parts of branched polyethylene PER-12 pre-pressure mixing for 90 seconds; then add 6 parts of zinc oxide, 2 An antioxidant RD and 1 part stearic acid, 4 parts of coumarone resin and 3 parts of RX-80 resin, kneaded for 1 minute; 55 parts of carbon black N330, 5 parts of paraffin oil SUNPAR 2280, mixed for 3 minutes; finally added 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC), 5 parts of cross-linking agent zinc methacrylate and 0.3 parts of cross-linking Sulphur, glued for 2 minutes and then discharged. After the thin open on the open mill, the film is left for 24 hours.

The rest of the processing steps are the same as in Example 15.

The test performance of the compression layer rubber of the present embodiment after vulcanization is: hardness: L direction tensile strength is 22.7 MPa, L direction elongation at break is 89%, T direction tensile strength is 13.2 MPa, T direction fracture The elongation was 239% and the tear strength was 67.3 N/mm.

Example 20

The utility model relates to a high temperature resistant rubber roller, which uses the rubber composition provided by the invention, and the formula and the mixing method are as follows:

Set the temperature of the internal mixer to 100 ° C, the rotor speed to 50 rpm, and then mix 100 parts of branched polyethylene PER-10 and 7 parts of aramid short fibers in an internal mixer for 130 seconds to make short fibers. Fully dispersed into the rubber matrix; then added 6 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant RD, 1 part of antioxidant MB, 5 parts of coumarone resin and 5 parts of terpene resin, and kneaded for 1 minute; Add 55 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, mix and disperse for 3 minutes, then disperse the glue, and leave the mixed masterbatch at room temperature for not less than 24 hours, then place on the roller of the open mill, and the surface of the master roll is smooth. After adding 4 parts of cross-linking agent dicumyl peroxide (DCP), 1.5 parts of cross-linking agent triallyl isocyanurate (TAIC), 10 parts of cross-linking agent zinc methacrylate and 0.3 parts of help The cross-linking agent sulphur is mixed for 3 minutes. After all the above-mentioned compounding agents are mixed into the masterbatch, the slab is smelted and smelted. After the film is thinned, the film is discharged, and the film is left at room temperature for 12 hours and then cut into strips to obtain a final strip.

The remaining processing steps are in accordance with Example 17.

Example 21:

A water delivery hose, the processing steps are as follows:

(1) Mixing: set the internal temperature of the mixer to 95 ° C, the rotor speed to 40 rpm, add 50 parts of branched polyethylene PER-11 and 50 parts of branched polyethylene PER-5 pre-pressed and kneaded for 90 seconds; Add 5 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant RD, and knead for 1 minute; then add 30 parts of highly dispersible white carbon and 15 parts of paraffin oil SUNPAR 2280 to the compound and mix for 3 minutes; Add 5 parts of aramid staple fiber of length 1mm and mix for 2 minutes; finally add 4 parts of cross-linking agent dicumyl peroxide (DCP), 1 part of cross-linking agent triallyl isocyanurate ( TAIC) and 0.3 parts of sulfur, which were mixed for 2 minutes and then discharged. After the thin open on the open mill, the film is left for 24 hours.

(2) Extrusion and molding: the rubber mixture is put into a cold feed extruder, and the rubber layer is extruded on the mandrel to obtain a tube blank, which is vulcanized by high temperature steam, and the temperature is 165 ° C, the steam pressure is 1 MPa, and then vulcanized. After 25 minutes, it is cooled, cored, trimmed, inspected, and stored in a warehouse to obtain a hose.

The superiority of the branched polyethylene in cross-linking ability is demonstrated by the cross-linking performance test comparison of Examples 22 and 23 and Comparative Example 3.

The rubber substrate used in Example 22 was 100 parts of PER-12, and the rubber substrate used in Example 23 was 50 parts of PER-12 and 50 parts of ethylene propylene diene monomer (ML (1+4) 125 ° C was 60, and the ethylene content was 68. %, ENB content 4.8%), the rubber substrate used in Comparative Example 3 was 100 parts of the ethylene propylene diene rubber used in Example 23. The rest of the formula is consistent.

The processing steps of the three rubber compositions are as follows:

Set the temperature of the internal mixer to 80 ° C, the rotor speed to 50 rpm, add the rubber matrix pre-pressing and kneading for 90 seconds; add 5 parts of zinc oxide, 1 part of stearic acid, 2 parts of antioxidant RD and 5 parts of coumarone Resin, knead for 1 minute; then add 45 parts of carbon black N330, 5 parts of paraffin oil to the compound, mix for 3 minutes; then add 20 parts of nylon short fiber of length 1mm, mix for 2 minutes; finally add 4 parts The cross-linking agent dicumyl peroxide (DCP), 1.5 parts of the cross-linking agent triallyl isocyanurate (TAIC) and 3 parts of zinc methacrylate were mixed for 2 minutes and then discharged. After the thin open on the open mill, the film is left for 24 hours.

The test conditions were 175 ° C, 30 min, and the test results were as follows:

	Example 22	Example 23	Comparative Example 3
ML, dN.m	3.12	3.38	2.88
MH, dN.m	26.82	27.17	27.03
MH-ML, dN.m	23.70	23.79	24.15
Tc90,min	6.0	7.1	8.2

The rubber composition of Example 22 has the shortest Tc90, which is about 25% shorter than that of Comparative Example 3, and the MH-ML values are very close, indicating that the branched polyethylene used in this embodiment can be superior to the conventional ternary in cross-linking ability. The crosslinking ability of ethylene propylene rubber.

Claims (23)

1. A rubber composition characterized in that the rubber composition comprises, in terms of unit weight parts, a rubber matrix and an essential component, the rubber matrix comprising: a content of branched polyethylene a: 0 < a ≤ 100 The content of the binary ethylene propylene rubber and the ethylene propylene diene rubber is b: 0 ≤ b < 100 parts; the essential component comprises: 1.5 to 9 parts of the crosslinking agent, short fiber 5, based on 100 parts by weight of the rubber matrix. ～60 parts, the branched polyethylene comprises an ethylene homopolymer having a branching degree of not less than 50 branches/1000 carbons, a weight average molecular weight of not less than 50,000, and a Mooney viscosity ML (1+4) 125 ° C is not less than 2.
2. The rubber composition according to claim 1, wherein the content of the branched polyethylene in the rubber base is a: 10 ≤ a ≤ 100 parts; the ethylene propylene rubber and the ternary polyethylene are 100 parts by weight. The content of the propylene rubber is b: 0 ≤ b ≤ 90 parts; the branched polyethylene is an ethylene homopolymer having a branching degree of 60 to 130 branches/1000 carbons and a weight average molecular weight of 66,000 to 518,000. The Mooney viscosity ML (1+4) is 6 to 102 at 125 °C.
3. The rubber composition according to claim 1, wherein the crosslinking agent comprises at least one of a sulfur or a peroxide crosslinking agent, and the peroxide crosslinking agent comprises di-tert-butyl peroxide. , dicumyl peroxide, tert-butyl cumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-dimethyl -2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, bis(tert-butylperoxyperoxide) Of phenyl, 2,5-dimethyl-2,5-bis(benzoyl peroxy)hexane, tert-butyl peroxybenzoate, t-butylperoxy-2-ethylhexyl carbonate At least one.
4. The rubber composition according to claim 1, wherein the short fibers comprise at least one of polyamide short fibers and nylon short fibers, and the polyamide short fibers comprise nylon 6, nylon 66, and nylon 610. At least one of the short fibers has a length of 1 to 8 mm.
5. The rubber composition according to claim 1, wherein the rubber composition further comprises an auxiliary component, which is based on 100 parts by weight of the rubber base, and the auxiliary component comprises: a co-crosslinking agent 0.3 to 15 by weight. Parts, metal oxide 3 to 25 parts, plasticizer 3 to 90 parts, reinforcing filler 30 to 100 parts, stabilizer 1 to 3 parts, unsaturated carboxylic acid metal salt 3 to 20 parts, vulcanization accelerator 0 to 4 parts.
6. The rubber composition according to claim 5, wherein the auxiliary component comprises, by weight, 0.5 to 5 parts of a co-crosslinking agent, 5 to 20 parts of a metal oxide, and 5 to 60 of a plasticizer. 40 parts by weight of reinforcing filler, 1-2 parts of stabilizer, 5-15 parts of unsaturated carboxylic acid metal salt, and 0-3 parts of vulcanization accelerator.
7. The rubber composition according to claim 5, wherein the co-crosslinking agent comprises triallyl cyanurate, triallyl isocyanurate, triallyl trimellitate, Trimethylolpropane trimethyl acrylate, ethylene glycol dimethacrylate, N, N'-m-phenylene bismaleimide, N, N'-bis-decylene acetone, 1,2- At least one of polybutadiene and sulfur.
8. The rubber composition according to claim 5, wherein the metal oxide comprises at least one of zinc oxide, magnesium oxide, and calcium oxide.
9. The rubber composition according to claim 5, wherein the plasticizer comprises pine tar, motor oil, paraffin oil, coumarone, RX-80, naphthenic oil, stearic acid, paraffin, liquid ethylene At least one of rubber and liquid polyisobutylene.
10. The rubber composition according to claim 5, wherein the reinforcing filler comprises at least one of carbon black, calcium carbonate, calcined clay, magnesium silicate, aluminum silicate, and magnesium carbonate.
11. The rubber composition according to claim 5, wherein the stabilizer comprises 2,2,4-trimethyl-1,2-dihydroquinoline (RD), 6-ethoxy- 2,2,4-trimethyl-1,2-dihydroquinoline (AW), 2-mercaptobenzimidazole (MB), N-4 (anilinophenyl) maleimide (MC) At least one of them.
12. The rubber composition according to claim 5, wherein the unsaturated carboxylic acid metal salt comprises at least one of zinc methacrylate, magnesium methacrylate, aluminum methacrylate, and calcium methacrylate.
13. The rubber composition according to claim 5, wherein the vulcanization accelerator comprises 2-thiol benzothiazole, dibenzothiazole disulfide, tetramethylthiuram monosulfide, and tetrasulfide disulfide. Kethiram, tetraethylthiuram disulfide, N-cyclohexyl-2-benzothiazolyl sulfenamide, N,N-dicyclohexyl-2-phenylthiazolyl sulfenamide, bismaleyl At least one of an imine and an ethylene thiourea.
14. The rubber composition according to claim 1, wherein the short fibers are a surface-pretreated type which is excellent in blending properties with a non-polar rubber.
15. A method of producing the rubber composition according to any one of claims 1 to 14, characterized in that the production method comprises the following steps:

    (1) The temperature of the internal mixer and the rotation speed of the rotor are set, and the components other than the crosslinking system in the rubber composition used are sequentially added to an internal mixer for kneading; then the crosslinking system is added, and the rubber is discharged after the mixing. Wherein the crosslinking system comprises a crosslinking agent, and may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

    (2) The rubber compound obtained in the step (1) is thinned on the open mill by a roller not more than half the length of the short fiber used, and then the roll gap is enlarged, and then the film is placed and parked;

    (3) The kneaded film obtained in the step (2) is cut into a cavity of the mold, heated and vulcanized on a flat vulcanizer, and then released to obtain a vulcanized rubber.
16. A power transmission belt comprising: a main body comprising a cushion rubber layer and a compression rubber layer having a length, wherein the compression rubber layer comprises the rubber composition according to any one of claims 1 to 14.
17. The power transmission belt according to claim 16, wherein the compression rubber layer further comprises 10 to 80 parts by weight of a solid lubricant based on 100 parts by weight of the rubber base, wherein the solid lubricant comprises graphite, mica, molybdenum disulfide, and poly At least one of tetrafluoroethylene.
18. A method of producing the power transmission belt of claim 16, the power transmission belt being a V-ribbed belt, characterized in that the production method comprises the following steps:

    (1) Rubber kneading: the kneading of the rubber layer of the compression rubber is: the rubber matrix and the short fiber are mixed in an internal mixer for 120 to 140 s, so that the short fibers are sufficiently dispersed into the rubber matrix; The other components except the joint system are kneaded for 150 to 240 seconds; after thorough mixing, the rubber is discharged to obtain the mixed masterbatch, and the mixed mother rubber is allowed to stand at room temperature for not less than 24 hours, and then placed on the roller of the open mill, waiting for After the surface of the mother-adhesive wrapping roller is smooth, a crosslinking system is added, and after the above-mentioned compounding agent is completely mixed into the masterbatch, the compound is smelted and smelted, and the rubber material is thinned and then discharged, and the film is left at room temperature for a period of time, wherein the crosslinking system contains a crosslinking agent. At least one of a co-crosslinking agent and a vulcanization accelerator may also be included;

    The buffer rubber layer rubber does not contain short fibers, and the mixing process is: setting the temperature of the internal mixer and the rotation speed of the rotor, and kneading the rubber substrate in an internal mixer for 60 to 120 seconds to remove cross-linking of the rubber composition used. The components other than the system are sequentially added to the internal mixer for mixing; then the crosslinking system is added, the rubber is mixed after the mixing, and the rubber mixture is thinly passed through the open mill, parked and tested;

    (2) Molding: adopt reverse molding method: firstly hang the optical mold on the molding machine, clean the mold, apply a small amount of release agent, and after it is volatilized, wrap the v-ribbed top cloth on the optical mold, and then wrap the cushion layer glue. Material, correct the tension of the rope, level the winding strength layer and then wrap the buffer rubber, and finally wrap the wedge rubber to the outer perimeter required by the molding process to obtain the strip;

    (3) Vulcanization: The vulcanized vulcanization process is used to feed the strip into the vulcanization tank for vulcanization. The vulcanization temperature is 155-175 ° C, the internal pressure is 0.45-0.55 MPa, the external pressure is 1.0-1.2 MPa, and the vulcanization time is 25-30. minute.

    (4) Post-treatment: After the vulcanization is finished, the mold is cooled and released, and the belt is sent to the cutting process, and the width is cut according to the required width, the back is rubbed, the wedge is trimmed, and the finished product is obtained after inspection by trimming;
19. [Correct according to Rule 26 08.03.2018]
    A conveyor belt characterized in that at least one of the working surface covering rubber and the non-working surface covering rubber comprises the rubber composition according to any one of claims 1 to 14.
20. [Correct according to Rule 26 08.03.2018]
    

    A method of producing a conveyor belt according to claim 20, wherein the working surface covering tape of the conveyor belt comprises the rubber composition according to any one of claims 1 to 15, characterized in that the production method comprises the following steps:

    (1) Rubber mixing: set the temperature of the internal mixer and the rotor speed, then mix the rubber matrix and short fibers in an internal mixer for 120-140 seconds to fully disperse the short fibers into the rubber matrix; Mixing the other components except the cross-linking system for 150-240 seconds; after fully mixing, the rubber is glued to obtain the mixed masterbatch, and the mixed masterbatch is allowed to stand at room temperature for not less than 24 hours, and then placed on the roller of the open mill. After the surface of the master roll is smooth, a cross-linking system is added, and after the above-mentioned compounding agent is mixed into the masterbatch, the mold is tempered, the film is thinned and then discharged, and the film is left at room temperature for a period of time, wherein the cross-linking system comprises cross-linking. The agent may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

    (2) calendering process: the film obtained in the step (1) is placed in a screw extruder for hot refining, and then supplied to a calender for calendering and heat preservation for use;

    (3) Molding process: the film is closely attached to the pre-formed adhesive canvas strip blank on the forming machine to form a strip of high temperature resistant conveyor belt, and then rolled up for waiting for vulcanization;

    (4) placing the formed conveyor belt blank into a flat vulcanizing machine for segmental vulcanization;

    (5) After the vulcanization is finished, it is trimmed, inspected, and then packaged into the warehouse.
21. [Correct according to Rule 26 08.03.2018]
    A rubber roller characterized in that the rubber compound used comprises the rubber composition according to any one of claims 6 to 15.
22. [Correct according to Rule 26 08.03.2018]
    

    A method of producing the rubber roller of claim 22, wherein the production method comprises the steps of:

    (1) Rubber mixing: set the temperature of the internal mixer and the rotor speed, then mix the rubber matrix and short fibers in an internal mixer for 120-140 seconds to fully disperse the short fibers into the rubber matrix; Mixing the other components except the cross-linking system for 150-240 seconds; after fully mixing, the rubber is glued to obtain the mixed masterbatch, and the mixed masterbatch is allowed to stand at room temperature for not less than 24 hours, and then placed on the roller of the open mill. After the surface of the master rubber roll is smooth, a cross-linking system is added, and after the above-mentioned compounding agent is mixed into the masterbatch, the mold is smelted, and the rubber material is thinned and then discharged, and the film is left at room temperature for 12 hours, and then the strip is finally obtained. Wherein the crosslinking system comprises a crosslinking agent, and may further comprise at least one of a co-crosslinking agent and a vulcanization accelerator;

    (2) Wrap-wrapping: The strip obtained in step (1) is put into a screw extruder, and the film of thickness and width required by the extrusion process is to be uniform after the film is started, and the film is wound around the metal roll. On the core, the rubber is wrapped layer by layer until the thickness of the rubberized single side reaches a predetermined thickness, and then 2-3 layers of nylon water cloth are wound on the rubber surface to obtain a rubberized rubber roller;

    (3) vulcanization tank vulcanization, the rubberized rubber roller is sent to the vulcanization tank, after closing the tank door, steam is vulcanized into the vulcanization tank, and the compressed air valve is opened while steam is introduced, and the compressed air is passed to vulcanize. The pressure in the tank reaches 4.5-5 atmospheres in 0.5 hours; the vulcanization procedure is: firstly heat up to 70-80 ° C, keep warm for 2 hours; then heat up to 100-110 ° C, keep warm for 0.5 hours; then heat up to 120-130 ° C, keep warm 0.5 hours; then heat up to 135-140 ° C, keep warm for 8-10 hours, the end of vulcanization, open the exhaust valve, the pressure drops, when the pressure gauge pointer points to zero, open the safety pin, and the steam hole in the pin hole is fluttering, half Open the vulcanization tank and let the temperature drop. When the temperature inside the tank is lower than 60 ° C or equivalent to the room temperature, the rubber roller is pulled out;

    (4) Post-treatment: The vulcanized rubber roller is rough-processed on a lathe, and then finished on a grinding machine for inspection and inspection to obtain a finished product.
23. [Correct according to Rule 26 08.03.2018]
    A hose characterized in that the compound used comprises the rubber composition according to any one of claims 6 to 15.