WO2018143101A1 - アクリルゴム、アクリルゴム組成物、及びアクリルゴム架橋物 - Google Patents
アクリルゴム、アクリルゴム組成物、及びアクリルゴム架橋物 Download PDFInfo
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- WO2018143101A1 WO2018143101A1 PCT/JP2018/002564 JP2018002564W WO2018143101A1 WO 2018143101 A1 WO2018143101 A1 WO 2018143101A1 JP 2018002564 W JP2018002564 W JP 2018002564W WO 2018143101 A1 WO2018143101 A1 WO 2018143101A1
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- WIPO (PCT)
- Prior art keywords
- acrylic rubber
- acrylate
- acrylic
- acid
- meth
- Prior art date
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- 229920000058 polyacrylate Polymers 0.000 title claims abstract description 271
- 229920000800 acrylic rubber Polymers 0.000 title claims abstract description 269
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- 239000000178 monomer Substances 0.000 claims abstract description 134
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- 239000003431 cross linking reagent Substances 0.000 claims description 18
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- 125000003700 epoxy group Chemical group 0.000 claims description 8
- 125000005843 halogen group Chemical group 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 84
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- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 17
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- 125000004432 carbon atom Chemical group C* 0.000 description 10
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
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- XKJCHHZQLQNZHY-UHFFFAOYSA-N phthalimide Chemical compound C1=CC=C2C(=O)NC(=O)C2=C1 XKJCHHZQLQNZHY-UHFFFAOYSA-N 0.000 description 1
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- CONVKSGEGAVTMB-RKJRWTFHSA-M potassium (2R)-2-[(1R)-1,2-dihydroxyethyl]-4-hydroxy-5-oxo-2H-furan-3-olate Chemical compound [K+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] CONVKSGEGAVTMB-RKJRWTFHSA-M 0.000 description 1
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- 235000010259 potassium hydrogen sulphite Nutrition 0.000 description 1
- RWPGFSMJFRPDDP-UHFFFAOYSA-L potassium metabisulfite Chemical compound [K+].[K+].[O-]S(=O)S([O-])(=O)=O RWPGFSMJFRPDDP-UHFFFAOYSA-L 0.000 description 1
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- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
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- CONVKSGEGAVTMB-RXSVEWSESA-M potassium-L-ascorbate Chemical compound [K+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] CONVKSGEGAVTMB-RXSVEWSESA-M 0.000 description 1
- ANBFRLKBEIFNQU-UHFFFAOYSA-M potassium;octadecanoate Chemical compound [K+].CCCCCCCCCCCCCCCCCC([O-])=O ANBFRLKBEIFNQU-UHFFFAOYSA-M 0.000 description 1
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- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
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- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 description 1
- RBWSWDPRDBEWCR-RKJRWTFHSA-N sodium;(2r)-2-[(2r)-3,4-dihydroxy-5-oxo-2h-furan-2-yl]-2-hydroxyethanolate Chemical compound [Na+].[O-]C[C@@H](O)[C@H]1OC(=O)C(O)=C1O RBWSWDPRDBEWCR-RKJRWTFHSA-N 0.000 description 1
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- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- USNDJVGIYZJHOD-UHFFFAOYSA-N tetrapotassium;dioxidophosphanyl phosphite Chemical compound [K+].[K+].[K+].[K+].[O-]P([O-])OP([O-])[O-] USNDJVGIYZJHOD-UHFFFAOYSA-N 0.000 description 1
- KRAHLZAGPKKBSW-UHFFFAOYSA-N tetrasodium;dioxidophosphanyl phosphite Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])OP([O-])[O-] KRAHLZAGPKKBSW-UHFFFAOYSA-N 0.000 description 1
- 239000006234 thermal black Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- MDROHCXIEQHRRP-UHFFFAOYSA-N trisodium [hydroxy(oxido)phosphanyl] phosphite Chemical compound [Na+].[Na+].[Na+].OP([O-])OP([O-])[O-] MDROHCXIEQHRRP-UHFFFAOYSA-N 0.000 description 1
- NCPXQVVMIXIKTN-UHFFFAOYSA-N trisodium;phosphite Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])[O-] NCPXQVVMIXIKTN-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
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Classifications
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- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
- C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/17—Viscosity
Definitions
- the present invention relates to an acrylic rubber, an acrylic rubber composition, and an acrylic rubber cross-linked product.
- Acrylic rubber is widely used as a rubber material from which a rubber cross-linked product excellent in heat resistance, oil resistance and aging resistance can be obtained, for various sealing materials mainly for automobile use, and functional parts such as hoses.
- the demand for such acrylic rubber is expected to increase in the future, and improvement in productivity of crosslinked acrylic rubber (or molded acrylic rubber) is required.
- the acrylic rubber cross-linked product can be obtained by, for example, passing an acrylic rubber composition obtained by adding other components such as a cross-linking agent and a filler to acrylic rubber, and extruding the cross-linked product.
- an acrylic rubber composition obtained by adding other components such as a cross-linking agent and a filler to acrylic rubber, and extruding the cross-linked product.
- the extrudability from the extruder is improved (for example, the discharge amount is increased and the discharge length is increased), the productivity of the acrylic rubber molded product is improved.
- the combination and addition amount of other components blended in the acrylic rubber have been adjusted.
- An object of the present invention is to provide an acrylic rubber that improves the productivity of rubber moldings.
- an acrylic rubber according to one embodiment of the present invention has a (meth) acrylic acid ester monomer unit and a crosslinkable monomer unit, and has a complex viscosity ⁇ * ( 60 ° C.) and the complex viscosity ⁇ * (100 ° C.) at 100 ° C. satisfy the following formula (1) and the following formula (2).
- the acrylic rubber according to the embodiment of the present invention has a (meth) acrylate monomer unit and a crosslinkable monomer unit, and has a complex viscosity ⁇ * (60 ° C.) at 60 ° C. and 100 ° C.
- the complex viscosity ⁇ * (100 ° C.) is an acrylic rubber that satisfies the following formula (1) and the following formula (2).
- the acrylic rubber of the present embodiment is a rubber-like polymer containing a (meth) acrylic acid ester monomer unit in the molecule, preferably containing a (meth) acrylic acid ester monomer as a main component.
- (meth) acrylic acid means both “acrylic acid” and “methacrylic acid”.
- containing as a main component means that it is contained in an amount of 50% by weight or more in all monomer units constituting the acrylic rubber polymer.
- (meth) acrylic acid ester monomer which forms the (meth) acrylic acid ester monomer unit contained in the acrylic rubber of this embodiment
- (meth) acrylic-acid alkylester single quantity And (meth) acrylic acid alkoxyalkyl ester monomers for example, (meth) acrylic-acid alkylester single quantity And (meth) acrylic acid alkoxyalkyl ester monomers.
- the (meth) acrylic acid alkyl ester monomer is not particularly limited, but is preferably an ester of an alkanol having 1 to 8 carbon atoms and (meth) acrylic acid, specifically, methyl (meth) acrylate, ( (Meth) ethyl acrylate, (meth) acrylic acid n-propyl, (meth) acrylic acid isopropyl, (meth) acrylic acid n-butyl, (meth) acrylic acid isobutyl, (meth) acrylic acid n-hexyl, (meth) Examples include 2-ethylhexyl acrylate and cyclohexyl (meth) acrylate.
- ethyl (meth) acrylate and n-butyl (meth) acrylate are preferable, and ethyl acrylate and n-butyl acrylate are particularly preferable. These can be used alone or in combination of two or more.
- the (meth) acrylic acid alkoxyalkyl ester monomer is not particularly limited, but an ester of an alkoxyalkyl alcohol having 2 to 8 carbon atoms and (meth) acrylic acid is preferable.
- (meth) acrylic acid Methoxymethyl, ethoxymethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-propoxyethyl (meth) acrylate, 2-butoxyethyl (meth) acrylate , 3-methoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, and the like.
- 2-ethoxyethyl (meth) acrylate and 2-methoxyethyl (meth) acrylate are preferable, and 2-ethoxyethyl acrylate and 2-methoxyethyl acrylate are particularly preferable. These can be used alone or in combination of two or more.
- the content of the (meth) acrylic acid ester monomer unit is preferably 50 to 99.5% by weight, more preferably 60 to 99% with respect to 100% by weight in total of all monomer units constituting the acrylic rubber. 0.0% by weight, more preferably 70 to 99.0% by weight. If the content of the (meth) acrylic acid ester monomer unit is too small, the heat resistance and oil resistance of the resulting rubber cross-linked product may be reduced. May decrease.
- the content of the (meth) acrylic acid ester monomer unit is 30 to 100% by weight of the (meth) acrylic acid alkyl ester monomer unit, and the (meth) acrylic acid alkoxyalkyl ester single amount.
- the body unit is preferably composed of 0 to 70% by weight.
- the acrylic rubber according to this embodiment optionally has a polyfunctional monomer unit.
- the polyfunctional monomer unit optionally contained is a monomer unit having two or more functional groups in one molecule.
- a functional group here is a group copolymerizable with a (meth) acrylic acid ester monomer.
- the polyfunctional monomer that forms this polyfunctional monomer unit is not particularly limited, and examples thereof include divinylbenzene, ethylene glycol dimethacrylate, diethylene glycol methacrylate, triethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and tetro.
- Methylolmethane tetramethacrylate, dipropylene glycol dimethacrylate, polyethylene glycol dimethacrylate, and acrylates thereof can be used.
- divinylbenzene, ethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate are preferred. Two or more kinds of these polyfunctional monomers may be used.
- the content of the polyfunctional monomer unit is preferably 10.0% by weight or less, more preferably 7.5% by weight or less, with respect to a total of 100% by weight of all monomer units constituting the acrylic rubber. More preferably, it is 0.01 to 5.0% by weight.
- the crosslinkable monomer unit contained in the acrylic rubber according to this embodiment is a structural unit derived from a crosslinkable monomer having a crosslinkable group in the side chain. Although it does not specifically limit as a crosslinkable group which comprises the side chain of this crosslinkable monomer, It is a crosslinkable group which has any 1 type, or 2 or more types of a carboxyl group, an epoxy group, and a halogen group. preferable. That is, the crosslinkable monomer unit is preferably a monomer unit having at least one carboxyl group, epoxy group, and halogen group.
- the crosslinkable monomer that forms the crosslinkable monomer unit is not particularly limited.
- a monomer having a carboxyl group a monomer having an epoxy group; a monomer having a halogen group (or a halogen atom).
- a diene monomer; and the like a monomer having a carboxyl group; a monomer having an epoxy group; a monomer having a halogen group (or a halogen atom).
- the monomer having a carboxyl group is not particularly limited, and examples thereof include an ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer.
- the ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer is not particularly limited, and examples thereof include ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid having 3 to 12 carbon atoms, ⁇ , ⁇ having 4 to 12 carbon atoms.
- the acrylic rubber By using the ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer, the acrylic rubber can be converted into a carboxyl group-containing acrylic rubber having a carboxyl group as a crosslinking point, and thus a rubber cross-linked product can be obtained. Further, the compression set resistance can be further improved.
- ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid having 3 to 12 carbon atoms include acrylic acid, methacrylic acid, ⁇ -ethylacrylic acid, crotonic acid, and cinnamic acid.
- ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms include butenedionic acid such as fumaric acid and maleic acid; itaconic acid; citraconic acid; chloromaleic acid;
- monoesters of ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acids having 4 to 12 carbon atoms and alkanols having 1 to 8 carbon atoms include monomethyl fumarate, monoethyl fumarate, mono n-butyl fumarate, malein Butenedionic acid mono-chain alkyl esters such as monomethyl acid, monoethyl maleate, and mono-n-butyl maleate; monocyclopentyl fumarate, monocyclohexyl fumarate, monocyclohexenyl fumarate, monocyclopentyl maleate, monocyclohexyl maleate, maleate And butenedionic acid monoesters having an alicyclic structure such as acid monocyclohexenyl; itaconic acid monoesters such as monomethyl itaconate, monoethyl itaconate, mono n-butyl itaconate, and monocyclohexyl itaconate;
- butenedionic acid mono-chain alkyl ester or butenedionic acid monoester having an alicyclic structure is preferable, and mono n-butyl fumarate, mono n-butyl maleate, monocyclohexyl fumarate, and monocyclohexyl maleate are preferable. More preferred is mono n-butyl fumarate.
- dicarboxylic acids include those that exist as anhydrides.
- Epoxy group containing (meth) acrylic acid ester such as glycidyl (meth) acrylate
- Epoxy group containing ethers such as allyl glycidyl ether and vinyl glycidyl ether; Is mentioned.
- unsaturated alcohol ester of halogen-containing saturated carboxylic acid for example, unsaturated alcohol ester of halogen-containing saturated carboxylic acid, (meth) acrylic acid haloalkyl ester, (meth) acrylic acid haloacyloxyalkyl ester, (meth) acrylic Examples include acid (haloacetylcarbamoyloxy) alkyl esters, halogen-containing unsaturated ethers, halogen-containing unsaturated ketones, halomethyl group-containing aromatic vinyl compounds, halogen-containing unsaturated amides, and haloacetyl group-containing unsaturated monomers.
- unsaturated alcohol ester of a halogen-containing saturated carboxylic acid examples include vinyl chloroacetate, vinyl 2-chloropropionate, and allyl chloroacetate.
- (meth) acrylic acid haloalkyl esters include chloromethyl (meth) acrylate, 1-chloroethyl (meth) acrylate, 2-chloroethyl (meth) acrylate, 1,2-dichloroethyl (meth) acrylate. , 2-chloropropyl (meth) acrylate, 3-chloropropyl (meth) acrylate, and 2,3-dichloropropyl (meth) acrylate.
- (meth) acrylic acid haloacyloxyalkyl esters include 2- (chloroacetoxy) ethyl (meth) acrylate, 2- (chloroacetoxy) propyl (meth) acrylate, and 3- (chloro) (meth) acrylic acid. Acetoxy) propyl and 3- (hydroxychloroacetoxy) propyl (meth) acrylate.
- (meth) acrylic acid (haloacetylcarbamoyloxy) alkyl esters include 2- (chloroacetylcarbamoyloxy) ethyl (meth) acrylate and 3- (chloroacetylcarbamoyloxy) propyl (meth) acrylate Is mentioned.
- halogen-containing unsaturated ether examples include chloromethyl vinyl ether, 2-chloroethyl vinyl ether, 3-chloropropyl vinyl ether, 2-chloroethyl allyl ether, and 3-chloropropyl allyl ether.
- halogen-containing unsaturated ketone examples include 2-chloroethyl vinyl ketone, 3-chloropropyl vinyl ketone, and 2-chloroethyl allyl ketone.
- halomethyl group-containing aromatic vinyl compound examples include p-chloromethylstyrene, m-chloromethylstyrene, o-chloromethylstyrene, and p-chloromethyl- ⁇ -methylstyrene.
- halogen-containing unsaturated amides include N-chloromethyl (meth) acrylamide.
- haloacetyl group-containing unsaturated monomer examples include 3- (hydroxychloroacetoxy) propyl allyl ether, p-vinylbenzyl chloroacetate and the like.
- a diene monomer Although it does not specifically limit as a diene monomer, for example, a conjugated diene monomer and a nonconjugated diene monomer are mentioned.
- a diene monomer is a diene monomer other than the monomer of the component contained in said polyfunctional monomer, when containing said polyfunctional monomer.
- conjugated diene monomer examples include 1,3-butadiene, isoprene, and piperylene.
- non-conjugated diene monomer examples include ethylidene norbornene, dicyclopentadiene, dicyclopentadienyl (meth) acrylate, and 2-dicyclopentadienyl ethyl (meth) acrylate.
- the acrylic rubber when an ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer is used, the acrylic rubber can be a carboxyl group-containing acrylic rubber. By making the acrylic rubber into a carboxyl group-containing acrylic rubber, it is possible to improve the compression set resistance while improving the oil resistance and heat resistance.
- the content of the crosslinkable monomer unit is preferably 0.1 to 10% by weight, more preferably 0.5 to 6% by weight, based on 100% by weight of the total monomer units constituting the acrylic rubber. It is. If the crosslinkable monomer unit is less than 0.1% by weight, the acrylic rubber is not sufficiently crosslinked and sufficient mechanical strength cannot be obtained. Moreover, when it exceeds 10 weight%, an acrylic rubber will be bridge
- acrylic rubber according to the present embodiment maintains the properties of the acrylic rubber
- other monomers that can be copolymerized are used. You may have the unit of.
- Other monomers that can be copolymerized are not particularly limited.
- an aromatic vinyl monomer (however, when it contains the above-mentioned polyfunctional monomer, it corresponds to the polyfunctional monomer).
- ⁇ , ⁇ -ethylenically unsaturated nitrile monomers, olefin monomers, and vinyl ether compounds are not particularly limited.
- aromatic vinyl monomer examples include styrene and ⁇ -methylstyrene.
- ⁇ , ⁇ -ethylenically unsaturated nitrile monomer include acrylonitrile and methacrylonitrile.
- olefin monomer examples include ethylene, propylene, 1-butene, and 1-octene.
- vinyl ether compound examples include vinyl acetate, ethyl vinyl ether, and n-butyl vinyl ether. Among these, styrene, acrylonitrile, methacrylonitrile, ethylene and vinyl acetate are preferable, and acrylonitrile, methacrylonitrile and ethylene are more preferable.
- copolymerizable monomers may be used alone or in combination of two or more.
- the content of other monomer units in the acrylic rubber is 80% by weight or less, preferably 70% by weight or less, more preferably 60% by weight or less.
- the acrylic rubber according to this embodiment has a complex viscosity ⁇ * (60 ° C.) at 60 ° C. and a complex viscosity ⁇ * (100 ° C.) at 100 ° C. of the following formulas (1) and (2). To meet.
- the complex viscosity ⁇ * was measured using a dynamic viscoelasticity measuring device “Rubber Process Analyzer RPA-2000” (manufactured by Alpha Technologies Co., Ltd.) with a strain of 473% and a temperature dispersion (40 to 120 ° C.) at 1 Hz. Viscoelasticity.
- the complex viscosity ⁇ * (60 ° C.) at 60 ° C. is the dynamic viscoelasticity measured at 60 ° C.
- the complex viscosity ⁇ * (100 ° C.) at 100 ° C. is the dynamic viscosity measured at 100 ° C. It is elastic.
- the ratio “ ⁇ * (100 ° C.) / ⁇ * (60 ° C.)” of the complex viscosity ⁇ * (60 ° C.) at 60 ° C. and the complex viscosity ⁇ * (100 ° C.) at 100 ° C. is As mentioned above, it is less than 0.8, preferably less than 0.78, more preferably less than 0.76.
- the lower limit of “ ⁇ * (100 ° C.) / ⁇ * (60 ° C.)” is not particularly limited, but is preferably 0.3 or more, more preferably 0.4 or more, and further preferably 0.45 or more.
- the complex viscosity ⁇ * (100 ° C.) at 100 ° C. is less than 3500 Pa ⁇ s as described above, preferably less than 3400 Pa ⁇ s, more preferably less than 3300 Pa ⁇ s. is there.
- the lower limit of ⁇ * (100 ° C.) is not particularly limited, but is preferably 2000 or more, more preferably 2100 or more, and further preferably 2200 or more.
- the acrylic rubber according to this embodiment is preferably an acrylic rubber having a long chain branching index LCBindex that satisfies the following formula (3).
- the long chain branching index LCBindex is obtained by measuring LAOS (Large Amplitude Oscillator Shear) at 100 ° C. with a strain of 1000% using a rubber process analyzer RPA-2000 (manufactured by Alpha Technologies).
- the long chain branching index LCBindex is preferably more than 6.0 as described above, and more preferably more than 7.0. Moreover, although the upper limit of LCBindex is not specifically limited, LCBindex becomes like this. Preferably it is 20 or less, More preferably, it is 16 or less, More preferably, it is 13 or less.
- Acrylic rubber that satisfies these conditions can increase the discharge amount of the acrylic rubber composition and lengthen the discharge length in extrusion molding, so that the productivity can be increased when manufacturing rubber moldings by extrusion molding. Can be further improved.
- the viscoelasticity of the acrylic rubber so as to satisfy the conditions of the above formula (1), the above formula (2) and the above formula (3), and using the adjusted acrylic rubber, the rubber It can be said that the productivity of the molded product can be further improved.
- the acrylic rubber according to this embodiment is an acrylic rubber having a complex viscosity ⁇ * at 100 ° C. (100 ° C.) satisfying the following formula (4) and a long-chain branching index LCB index satisfying the following formula (5).
- Acrylic rubber that satisfies these conditions can further increase the discharge amount of the crosslinked acrylic rubber and increase the discharge length in extrusion molding. Can be improved.
- the molecular weight of the acrylic rubber according to this embodiment is 200,000 to 1,000,000, preferably 220,000 to 900,000, in terms of weight average molecular weight (Mw).
- Mw weight average molecular weight
- molecular weight here means the molecular weight of the remaining component which removed the insoluble component, when an insoluble component exists in acrylic rubber.
- the molecular weight of the acrylic rubber is less than 200,000, sufficient viscoelasticity cannot be obtained in the vicinity of the die of the extruder, and the rubber composition in the extrusion molding may stick to each other, or the hose shape retainability deteriorates.
- the molecular weight of the acrylic rubber exceeds 1,000,000, the viscoelasticity of the acrylic rubber becomes too high and the surface skin of the rubber composition is deteriorated.
- the acrylic rubber according to this embodiment has a gel amount in the rubber polymer of 80% or less, preferably 5 to 80%.
- the amount of the gel exceeds 80%, it is expected that the viscoelasticity of the acrylic rubber becomes too high and the elongation of the crosslinked rubber is lowered. Further, it is preferable that the gel amount is as much as possible in the range of 70 or less. When the gel amount is less than 5%, the extrudability deteriorates.
- the acrylic rubber of the present embodiment has a Mooney viscosity (ML1 + 4, 100 ° C.) as an acrylic rubber polymer, preferably 5 to 80, more preferably 10 to 70, still more preferably 15 to 60.
- the acrylic rubber having such Mooney viscosity is excellent in the processability of the resulting acrylic rubber composition, and excellent in the mechanical properties of the crosslinked acrylic rubber.
- the method for producing an acrylic rubber according to the present embodiment comprises a (meth) acrylic acid ester monomer and a crosslinkable monomer in the presence of a reaction catalyst and a molecular weight regulator, emulsion polymerization, suspension polymerization, solution polymerization. Further, it can be produced by copolymerization (radical polymerization) using a known method such as bulk polymerization. Among them, the emulsion polymerization is preferably performed at a low temperature (100 ° C. or less), more preferably normal pressure, from the viewpoint of facilitating the production of acrylic rubber.
- an acrylic monomer constituting the acrylic rubber according to the above-described embodiment can be used as the (meth) acrylic acid ester monomer used in the manufacturing method of the present embodiment.
- This (meth) acrylic acid ester monomer can be used individually by 1 type or in combination of 2 or more types.
- a polyfunctional monomer is arbitrarily used.
- the polyfunctional monomer which comprises arbitrarily the acrylic rubber which concerns on the above-mentioned embodiment can be used.
- These polyfunctional monomers can be used singly or in combination of two or more. If the amount of the polyfunctional monomer is increased, the branched structure of the rubber polymer is increased and the gel amount is increased, so that the Mooney viscosity of the rubber polymer tends to increase.
- crosslinkable monomer used in the method for producing acrylic rubber according to this embodiment the crosslinkable monomer constituting the acrylic rubber according to the above embodiment can be used. These crosslinkable monomers can be used singly or in combination of two or more.
- a polymerization initiator used in the method for producing acrylic rubber according to the present embodiment a polymerization initiator used in a usual manner in the production of acrylic rubber can be used.
- azo compounds such as azobisisobutyronitrile
- organic peroxides such as diisopropylbenzene hydroperoxide, cumene hydroperoxide, paramentane hydroperoxide, benzoyl peroxide
- sodium persulfate, potassium persulfate peroxide
- Inorganic peroxides such as hydrogen and ammonium persulfate
- These polymerization initiators can be used alone or in combination of two or more.
- the amount of the polymerization initiator used is preferably 0.001 to 1.0 part by weight with respect to 100 parts by weight of the monomer used for the polymerization.
- the amount of the polymerization initiator used is increased, the molecular weight tends to decrease and the Mooney viscosity of the acrylic rubber polymer tends to decrease.
- the organic peroxide and the inorganic peroxide as the polymerization initiator as a redox polymerization initiator in combination with a reducing agent.
- a reducing agent used in combination
- the compound containing metal ions in a reduced state such as ferrous sulfate, sodium hexamethylenediamine tetraacetate, cuprous naphthenate; ascorbic acid, sodium ascorbate Ascorbic acid (salt) such as potassium ascorbate; Erythorbic acid (salt) such as erythorbic acid, sodium erythorbate, potassium erythorbate; saccharides; Sulphinates such as sodium hydroxymethanesulfinate; Sodium hydrogen hydride, sodium aldehyde sodium hydrogen sulfite, potassium hydrogen sulfite; pyrosulfites such as sodium pyrosulfite, potassium pyrosulfite, sodium hydrogen bisulfit
- the molecular weight modifier used in the method for producing acrylic rubber according to the present embodiment can be a molecular weight modifier used in a conventional manner in the production of acrylic rubber.
- the amount of molecular weight regulators is increased, the Mooney viscosity of the acrylic rubber polymer tends to decrease due to a decrease in molecular weight.
- polymerization auxiliary materials such as a particle size adjusting agent, a chelating agent, and an oxygen scavenger can be used as necessary.
- the reaction temperature and reaction time may be adjusted as appropriate.
- the temperature is 0 to 100 ° C. for 0.1 to 50 hours, preferably 5 to 80 ° C. for 0.5 to 30 hours.
- reaction temperature is raised, the amount of gels will increase and a branched structure will increase.
- the molecular weight tends to decrease and the Mooney viscosity tends to decrease.
- the reaction pressure may be adjusted as appropriate depending on the type of acrylic rubber. For example, the polymerization reaction of acrylate acrylic rubber is performed under normal pressure, and in the case of ethylene-acrylate acrylic rubber, it is performed under high pressure.
- acrylic rubber that undergoes a polymerization reaction under high pressure such as ethylene-acrylate acrylic rubber, tends to lower the Mooney viscosity because the molecular weight of the rubber polymer decreases and the branch structure increases. There is.
- the Mooney viscosity showing the physical properties of the acrylic rubber is adjusted by adjusting the amount of any of the above-mentioned polyfunctional monomers, the amount of catalyst, the amount of molecular weight regulator, the reaction temperature, and the reaction pressure.
- fills the conditions of following formula (1) and following formula (2) can be manufactured, maintaining this.
- the physical property of acrylic rubber is shown by adjusting the arbitrary polyfunctional monomer amount mentioned above, a catalyst amount, the amount of molecular weight regulators, reaction temperature, and reaction pressure.
- An acrylic rubber that satisfies the conditions of the following formula (4) and the following formula (5) can be produced while maintaining the Mooney viscosity.
- the acrylic rubber composition according to this embodiment contains an acrylic rubber and a crosslinking agent.
- the acrylic rubber described above can be used as the acrylic rubber included in the acrylic rubber composition of the present embodiment.
- the crosslinking agent used in the present embodiment is not limited as long as it reacts with a structural unit derived from a crosslinkable monomer that acts as a crosslinking point in acrylic rubber to form a crosslinked structure.
- crosslinking agent examples include polyvalent amine compounds such as diamine compounds, and carbonates thereof; polyhydric hydrazide compounds; sulfur; sulfur donors; triazine thiol compounds; polyvalent epoxy compounds; organic carboxylic acid ammonium salts; A conventionally known crosslinking agent such as a salt; a polyvalent carboxylic acid; a quaternary onium salt; an imidazole compound; an isocyanuric acid compound; an organic peroxide; These crosslinking agents can be used alone or in combination of two or more.
- the crosslinking agent is preferably selected as appropriate according to the type of the crosslinkable monomer unit.
- the crosslinker is preferably a polyvalent amine compound or a polyhydric hydrazide compound.
- An amine compound is more preferable.
- the polyvalent amine compound aliphatic diamines and aromatic diamines are preferable. Among aliphatic diamines, hexamethylene diamine carbamate is preferable, and among aromatic diamines, 2,2-bis [4- ( 4-Aminophenoxy) phenyl] propane is preferred.
- crosslinkable monomer constituting the crosslinkable monomer unit is a crosslinkable monomer containing an epoxy group
- ammonium benzoate, dithiocarbamate, and derivatives thereof, imidazoles, etc. are used as the crosslinker. can do.
- the crosslinking agent may be trithiocyanuric acid, 2,4,6-trimercapto-s-triazine or the like.
- Triazine thiol derivatives, organic carboxylic acid ammonium salts such as ammonium adipate, a mixture of metal soap and sulfur, and the like can be used.
- the content of the crosslinking agent in the acrylic rubber composition of the present embodiment is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the acrylic rubber in the acrylic rubber composition. Particularly preferred is 0.2 to 5 parts by weight.
- bridge crosslinking will become inadequate and there exists a possibility that the shape maintenance of an acrylic rubber crosslinked material may become difficult.
- the amount is too large, the cross-linked acrylic rubber becomes too hard and the elasticity may be impaired.
- the acrylic rubber composition of the present embodiment can contain a crosslinking accelerator in addition to the crosslinking agent.
- the crosslinking accelerator is not particularly limited as long as it promotes crosslinking in combination with the crosslinking agent.
- a crosslinking accelerator can be used individually by 1 type or in combination of 2 or more types.
- the amount of the crosslinking accelerator used is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 7.5 parts by weight, particularly preferably 1 to 1 part by weight based on 100 parts by weight of the acrylic rubber in the acrylic rubber composition. 5 parts by weight.
- the amount of the crosslinking accelerator used is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 7.5 parts by weight, particularly preferably 1 to 1 part by weight based on 100 parts by weight of the acrylic rubber in the acrylic rubber composition. 5 parts by weight.
- the acrylic rubber composition according to the present embodiment includes a crosslinking activator, filler, lubricant, anti-aging agent, scorch as a compounding agent generally used in the field of acrylic rubber.
- a crosslinking activator such as an inhibitor, a process oil, and a plasticizer can be blended.
- the filler is not particularly limited, and carbon-based materials such as carbon black and graphite can be used. Among these, it is preferable to use carbon black.
- carbon black include furnace black, acetylene black, thermal black, channel black, and the like. Of these, furnace black is preferably used, and specific examples thereof include SAF, ISAF, ISAF-HS, ISAF-LS, IISAF-HS, HAF, HAF-HS, HAF-LS, MAF, FEF and the like. In particular, FEF, MAF, and HAF-HS are preferable.
- Specific examples of graphite include natural graphite such as scaly graphite and scaly graphite, and artificial graphite.
- the carbonaceous material mentioned above can be used individually or in combination of 2 or more types, respectively.
- the addition amount of the filler is preferably 40 to 90 parts by weight with respect to 100 parts by weight of the acrylic rubber in the acrylic rubber composition.
- fillers other than carbon-based materials include metal powders such as aluminum powder; inorganic powders such as hard clay, talc, calcium carbonate, titanium oxide, calcium sulfate, calcium carbonate, and aluminum hydroxide; starch and polystyrene powder, etc.
- metal powders such as aluminum powder
- inorganic powders such as hard clay, talc, calcium carbonate, titanium oxide, calcium sulfate, calcium carbonate, and aluminum hydroxide
- starch and polystyrene powder etc.
- powders such as organic powders
- short fibers such as glass fibers (milled fibers), carbon fibers, aramid fibers, and potassium titanate whiskers
- silica, mica These fillers are used alone or in combination of two or more.
- the lubricant examples include hydrocarbon waxes such as paraffin wax, microcrystalline wax, polyethylene wax, polypropylene wax, and montan wax; stearic acid, hydroxystearic acid, composite stearic acid, fatty acid wax such as hardened oil Stearamide, oxystearamide, oleylamide, erucylamide, laurylamide, palmitylamide, behenamide, methylolamide, monoamide of higher fatty acids, methylene bissteramide, ethylene bissteramide, ethylene bisoleylamide, ethylene bislaurylamide, Higher fatty acid bisamide, N-stearyl oleylamide, N-stearyl erucylamide, N-stearyl palmitoamide, complex amide, special fatty acid amide
- Fatty acid amide waxes Fatty acid ester waxes such as n-butyl stearate, polyhydric alcohol fatty acid esters, saturated fatty acid esters, special fatty acid esters, aromatic fatty
- anti-aging agents such as phenol, amine, phosphoric acid and sulfur can be used.
- phenolic compounds include 2,2-methylenebis (4-methyl-6-tert-butylphenol), and typical examples of amine compounds include 4,4-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine. Etc.
- One of these anti-aging agents may be used alone, or two or more thereof may be used in combination.
- the scorch inhibitor is not particularly limited, but is an organic acid scorch inhibitor such as phthalic anhydride, benzoic acid, salicylic acid or malic acid; a nitroso compound scorch inhibitor such as N-nitrosodiphenylamine; N- (cyclohexylthio) Examples include thiophthalimide-based scorch inhibitors such as phthalimide; sulfonamide derivatives; 2-mercaptobenzimidazole; trichloromelamine; stearylamine.
- the scorch inhibitor may be used alone or in combination of two or more.
- the plasticizer is not particularly limited, but trimellitic acid plasticizer, pyromellitic acid plasticizer, ether ester plasticizer, polyester plasticizer, phthalic acid plasticizer, adipate ester plasticizer, phosphoric acid
- trimellitic acid plasticizer pyromellitic acid plasticizer
- ether ester plasticizer polyester plasticizer
- phthalic acid plasticizer adipate ester plasticizer
- phosphoric acid An ester plasticizer, a sebacic acid ester plasticizer, an alkyl sulfonic acid ester compound plasticizer, an epoxidized vegetable oil plasticizer, or the like can be used.
- trimellitic acid tri-2-ethylhexyl trimellitic acid isononyl ester, trimellitic acid mixed linear alkyl ester, dipentaerythritol ester, pyromellitic acid 2-ethylhexyl ester, polyether ester (molecular weight 300 to About 5,000), bis [2- (2-butoxyethoxy) ethyl adipate], dioctyl adipate, polyester based on adipic acid (molecular weight about 300 to 5000), dioctyl phthalate, diisononyl phthalate, dibutyl phthalate, phosphoric acid Examples thereof include tricresyl, dibutyl sebacate, alkyl sulfonic acid phenyl ester, epoxidized soybean oil, diheptanoate, di-2-ethylhexanoate, and didecanoate. These can be used alone or in combination.
- the acrylic rubber composition of the present embodiment may be blended with a polymer such as rubber, elastomer or resin other than the acrylic rubber of the present embodiment, if necessary.
- Examples of rubbers other than acrylic rubber include natural rubber (NR), isoprene rubber (IR), solution polymerization SBR (solution polymerization styrene butadiene rubber), emulsion polymerization SBR (emulsion polymerization styrene butadiene rubber), and low cis BR (butadiene rubber).
- NR natural rubber
- IR isoprene rubber
- solution polymerization SBR solution polymerization styrene butadiene rubber
- emulsion polymerization SBR emulsion polymerization styrene butadiene rubber
- low cis BR butadiene rubber
- High cis BR High cis BR
- high trans BR trans bond content of butadiene portion 70 to 95%)
- styrene-isoprene copolymer rubber butadiene-isoprene copolymer rubber
- ethylene propylene diene rubber EPDM
- emulsion polymerization styrene-acrylonitrile -Butadiene copolymer rubber acrylonitrile-butadiene copolymer rubber
- polyisoprene-SBR block copolymer rubber polystyrene-polybutadiene-polystyrene block copolymer
- acrylic rubber epichlorohydrin rubber, fluororubber, silicone rubber, ethylene Down - propylene rubber, urethane rubber, and the like.
- elastomer examples include olefin elastomers, styrene elastomers, polyester elastomers, polyamide elastomers, polyurethane elastomers, polysiloxane elastomers, and the like.
- the resin examples include olefin resin, styrene resin, acrylic resin, polyphenylene ether, polyester, polycarbonate, polyamide, and the like.
- a mixing method such as roll mixing, Banbury mixing, screw mixing, or solution mixing can be appropriately employed.
- the blending order is not particularly limited, but after sufficiently mixing components that are not easily reacted or decomposed by heat, components that are easily reacted by heat or components that are easily decomposed (for example, crosslinking agents, crosslinking accelerators, etc.) What is necessary is just to mix for a short time at the temperature which does not decompose
- the acrylic rubber composition according to the present embodiment thus obtained can increase the discharge amount of the acrylic rubber composition in extrusion molding and increase the discharge length. In the case of manufacturing, the productivity can be improved.
- the crosslinked acrylic rubber according to this embodiment is formed by crosslinking the above-mentioned acrylic rubber composition.
- Crosslinking is performed by heating the acrylic rubber composition.
- the crosslinking conditions are such that the crosslinking temperature is preferably 130 to 220 ° C., more preferably 140 to 200 ° C., and the crosslinking time is preferably 30 seconds to 2 hours, more preferably 1 minute to 1 hour.
- This first-stage crosslinking is sometimes referred to as primary crosslinking.
- a conventionally known molding method such as extrusion molding, injection molding, transfer molding, or compression molding can be employed as a molding method for obtaining a crosslinked acrylic rubber having a desired shape. Further, it can be heated simultaneously with molding to be crosslinked.
- General rubber processing procedures can be used for extrusion molding. That is, a rubber composition prepared by roll mixing or the like is supplied to the feed port of the extruder, softened by heating from the barrel in the process of being sent to the head portion with a screw, and passed through a die having a predetermined shape provided in the head portion. Thus, a long extruded product (plate, bar, pipe, hose, deformed product, etc.) having a target cross-sectional shape is obtained.
- the production method of the extrusion-molded product itself may be a known production method, and is not particularly limited, and includes, for example, a fiber coating, a thread core, and an adhesive product with other rubber or resin.
- the cross-linking of the extruded product can be obtained by forming into a predetermined shape and then performing primary vulcanization in a steam can. Moreover, you may perform the secondary vulcanization under hot air in oven as needed.
- a mold cavity having a shape corresponding to one or several products can be filled with the acrylic rubber composition of the present embodiment.
- crosslinking may be performed after molding in advance, or crosslinking may be performed simultaneously with molding.
- the molding temperature is usually 10 to 200 ° C, preferably 25 to 120 ° C.
- the crosslinking temperature is usually 130 to 220 ° C., preferably 150 to 190 ° C.
- the crosslinking time is usually 2 minutes to 10 hours, preferably 3 minutes to 5 hours.
- a heating method a method used for crosslinking of rubber, such as press heating, steam heating, oven heating, and hot air heating, may be appropriately selected.
- the rubber cross-linked product of the present embodiment may be further heated to perform secondary crosslinking.
- the secondary crosslinking varies depending on the heating method, crosslinking temperature, shape, etc., but is preferably performed for 1 to 48 hours. What is necessary is just to select a heating method and heating temperature suitably.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the acrylic rubber polymer were measured by gel permeation chromatography (GPC).
- the measurement by GPC uses “HLC-8320” manufactured by Tosoh Corp. as a measuring device and two separation columns “TSKgel GMHHR-H” manufactured by Tosoh Corp. connected in series, and column size: 7 0.8 mm ID ⁇ 30 cm, column temperature: 40 ° C., eluent: tetrahydrofuran, flow rate: 1.0 mL / min, injection amount: 50 ⁇ L.
- a differential refractometer manufactured by Tosoh Corporation, RI-8320 was used.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) were measured as polystyrene conversion values.
- Mw weight average molecular weight
- Mn number average molecular weight
- the adjusted solution was passed through a 0.5 ⁇ m mesh filter to remove high molecular weight components outside the GPC measurement range.
- the molecular weight distribution (Mw / Mn) of the acrylic rubber polymer was calculated from the above-mentioned weight average molecular weight (Mw) and number average molecular weight (Mn).
- ⁇ Amount of gel The amount of gel was measured as the amount of THF (tetrahydrofuran) insoluble component. The amount of the THF-insoluble component was calculated from the following formula using the peak area (mV ⁇ sec) obtained by measuring each acrylic polymer under the above GPC conditions.
- THF-insoluble component amount% 100 ⁇ [(Acrylic polymer peak area) / (Standard sample peak area) ⁇ 100]
- an acrylic rubber (trade name “NipolAR12” manufactured by Nippon Zeon Co., Ltd., “Nipol” is a registered trademark) containing no insoluble components was used. The larger this value, the greater the amount of THF-insoluble component consisting of gel and ultra-high molecular weight component.
- Discharge amount The extrusion weight (g / 20 seconds) per unit time as an acrylic rubber composition of acrylic rubber was measured as the discharge amount. The larger the value of the discharge amount, the more the extrusion amount increases, and the productivity increases (the number of die options increases, etc.).
- the monomer composition of the acrylic rubber was calculated by proton NMR measurement and potential difference measurement using a potassium hydroxide aqueous solution of a polymer acetone solution.
- NMR “AV500” manufactured by Bruker, and deuterated chloroform was used as a measurement solvent.
- acrylate acrylic rubber ethyl acrylate, n-butyl acrylate are methyl protons
- 2-methoxyethyl acrylate is OCH 2 + OCH 3 protons
- glycidyl methacrylate is protons derived from glycidyl groups
- divinylbenzene is derived from phenyl groups.
- the composition ratio of the protons of ethylene glycol dimethacrylate was calculated using the intensity of protons derived from ethylene glycol.
- the composition ratio was calculated using the intensity of the proton obtained by subtracting the proton derived from the above monomer from the methyl proton derived from methyl acrylate, the carboxylic acid proton derived from monoethyl maleate, and ethylene. .
- the obtained suspension polymerization solution was coagulated with a calcium chloride solution, washed with water and dried to obtain an acrylate acrylic rubber (A).
- the resulting acrylate acrylic rubber (A) has a polymer composition of monomer units (hereinafter sometimes referred to as monomer units) of ethyl acrylate 94.5%, divinylbenzene 1.5%, and glycidyl methacrylate. It contained 4.0%, Mooney viscosity was 30.0, weight average molecular weight (Mw) was 412,000, molecular weight distribution (Mw / Mn) was 3.22, and gel amount (%) was 42%. These results are shown in Table 2.
- the resulting acrylate acrylic rubber (B) has a polymer composition of monomer units of ethyl acrylate of 28.0%, n-butyl acrylate of 40.8%, 2-methoxyethyl acrylate of 28.7%, ethylene glycol Contains 0.5% dimethacrylate and 2.0% glycidyl methacrylate, Mooney viscosity is 33.5, weight average molecular weight (Mw) is 813,000, molecular weight distribution (Mw / Mn) is 2.82, gel The amount was 29%. These results are shown in Table 2.
- the resulting acrylate acrylic rubber (C) had a polymer composition of monomer units of 64.0% ethyl acrylate, 32.9% n-butyl acrylate, 1.1% divinylbenzene, and allyl glycidyl ether. Contained 0%, Mooney viscosity was 29.0, weight average molecular weight (Mw) was 600,000, molecular weight distribution (Mw / Mn) was 3.00, and gel amount was 52%. These results are shown in Table 2.
- the resulting acrylate acrylic rubber (D) has a polymer composition in terms of monomer units of 64.0% ethyl acrylate, 33.7% n-butyl acrylate, 1.1% divinylbenzene, and mono-n-fumarate. It contained 1.2% butyl, Mooney viscosity was 32.0, weight average molecular weight (Mw) was 810,000, molecular weight distribution (Mw / Mn) was 2.99, and gel amount was 37%. These results are shown in Table 2.
- the resulting acrylate acrylic rubber (E) has a polymer composition of monomer units of 64.0% ethyl acrylate, 23.7% n-butyl acrylate, 10.0% 2-methoxyethyl acrylate, divinylbenzene 1.1% and mono n-butyl fumarate 1.2%, Mooney viscosity 39.0, weight average molecular weight (Mw) 697,000, molecular weight distribution (Mw / Mn) 2.78, The gel amount was 60%. These results are shown in Table 2.
- the resulting acrylate acrylic rubber (F) has a polymer composition of monomer units of ethyl acrylate 54.0%, n-butyl acrylate 33.7%, methyl methacrylate 10.0%, divinylbenzene 1.1. %, And mono n-butyl fumarate 1.2%, Mooney viscosity is 43.0, weight average molecular weight (Mw) is 376,000, molecular weight distribution (Mw / Mn) is 3.22, gel amount is 80%. These results are shown in Table 2.
- the obtained acrylate acrylic rubber (H) has a polymer composition of monomer units of ethyl acrylate 63.5%, n-butyl acrylate 34.5%, ethylene glycol dimethacrylate 0.5%, and fumaric acid mono It contained n-butyl 1.5%, Mooney viscosity was 40, weight average molecular weight (Mw) was 873,000, molecular weight distribution (Mw / Mn) was 3.50, and gel amount was 21%. These results are shown in Table 2.
- ethylene-acrylate acrylic rubber (A) Polymerization was carried out according to the polymerization method of Example 1 of Japanese Patent Publication No. 55-5527.
- the obtained ethylene-acrylate acrylic rubber (A) has a polymer composition of monomer units of methyl acrylate (MeAc) 55.0%, ethylene 39.0%, monoethyl maleate 6.0%, Mooney The viscosity was 16.5, the weight average molecular weight (Mw) was 241,000, the molecular weight distribution (Mw / Mn) was 4.25, and the gel amount was 0%.
- the monomer composition was determined by proton NMR measurement.
- ethylene-acrylate acrylic rubber (B) Polymerization was carried out according to the polymerization method of Example 1 of JP-B 55-5527.
- the obtained ethylene-acrylate acrylic rubber (B) has a polymer composition of monomer units of 55.4% methyl acrylate, 41.0% ethylene, 3.6% monoethyl maleate, and a Mooney viscosity of 29. 0.0, the weight average molecular weight (Mw) was 235,000, the molecular weight distribution (Mw / Mn) was 2.85, and the gel amount was 2%.
- the monomer composition was determined by proton NMR measurement.
- the cross-linking agent was ammonium benzoate (trade name “Barnock AB”, manufactured by Ouchi Shinsei Chemical Co., Ltd., “Barnock” is a registered trademark), 1.5 parts, and the same as Formulation 1-1 except that no cross-linking accelerator was used.
- An acrylic rubber composition was obtained by mixing and kneading. Table 3 shows formulation examples.
- the cross-linking agent is semi-cured beef tallow fatty acid soda soap (trade name “NS Soap”, manufactured by Kao Corporation), 3 parts potassium stearate (extremely cured beef tallow) (trade name “NONSAR SK-1”, manufactured by NOF Corporation, “ Non-Sal ”is 0.5 part registered, and cross-linking accelerator is dispersible sulfur (trade name“ Salfax PMC ”, manufactured by Tsurumi Chemical Co., Ltd.,“ Salfax ”is a registered trademark) 0.3 part.
- An acrylic rubber composition was obtained by blending and kneading in the same manner as in Blend 1-1. Table 3 shows formulation examples.
- Example 1 The above-mentioned dynamic viscoelasticity was measured for the acrylate acrylic rubber (A) obtained in Production Example 1.
- acrylic rubber compositions in which acrylate acrylic rubber (A) was blended as acrylic rubber under the conditions of Formulation 1-2 and Formulation 2-2 were respectively extruded by the above-described extruder and the above-described extrudability was measured. did. The results are shown in Table 4.
- Example 2 With respect to the acrylate acrylic rubber (B) obtained in Production Example 2, the above dynamic viscoelasticity was measured. Further, an acrylic rubber composition in which an acrylate acrylic rubber (B) was blended as an acrylic rubber under the conditions of Blending 1-2 was extruded using the above-described extruder and the above-described extrudability was measured. The results are shown in Table 4.
- Example 3 With respect to the acrylate acrylic rubber (C) obtained in Production Example 3, the dynamic viscoelasticity described above was measured. In addition, an acrylic rubber composition in which an acrylate acrylic rubber (C) was blended as an acrylic rubber under the conditions of Formulation 1-2 was extruded using the above-described extruder, and the above-described extrudability was measured. The results are shown in Table 4.
- Example 4 With respect to the acrylate acrylic rubber (D) obtained in Production Example 4, the above dynamic viscoelasticity was measured. Further, an acrylic rubber composition in which an acrylate acrylic rubber (D) was blended as an acrylic rubber under the conditions of Formulation 1-1 and Formulation 2-1, was extruded by the above-described extruder and the above-described extrudability was measured. . The results are shown in Table 4.
- Example 5 With respect to the acrylate acrylic rubber (E) obtained in Production Example 5, the above dynamic viscoelasticity was measured. Further, an acrylic rubber composition in which an acrylate acrylic rubber (E) was blended as an acrylic rubber under the conditions of Formulation 1-1 was extruded using the above-described extruder, and the above-described extrudability was measured. The results are shown in Table 5.
- Example 6 With respect to the acrylate acrylic rubber (F) obtained in Production Example 6, the above dynamic viscoelasticity was measured. In addition, an acrylic rubber composition in which an acrylate acrylic rubber (F) was blended as an acrylic rubber under the conditions of Formulation 1-1 was extruded using the above-described extruder, and the above-described extrudability was measured. The results are shown in Table 5.
- Example 7 With respect to the acrylate acrylic rubber (G) obtained in Production Example 7, the dynamic viscoelasticity described above was measured. Further, an acrylic rubber composition in which an acrylate acrylic rubber (G) was blended as an acrylic rubber under the conditions of Formulation 1-3 and Formulation 2-3 was extruded by the above-described extruder, and the above-described extrudability was measured. . The results are shown in Table 5.
- Example 8 With respect to the ethylene-acrylate acrylic rubber (A) obtained in Production Example 12, the above dynamic viscoelasticity was measured. Further, an acrylic rubber composition in which ethylene-acrylate acrylic rubber (A) was blended as an acrylic rubber under the conditions of Blending 1-1 was extruded by the above-described extruder and the above-described extrudability was measured. The results are shown in Table 5.
- the acrylic rubber according to this embodiment has a polymer (polymer) viscoelasticity of ⁇ * (100 ° C.) / ⁇ * (60 ° C.) ⁇ 0.8, ⁇ * (100 ° C) ⁇ 3500 Pa ⁇ s, LCB index> 6.0.
- the acrylic rubber which concerns on this embodiment had the discharge amount of acrylic rubber crosslinked material over 1000 g / 20 second, the discharge length over 150 cm / 20 second, and the surface smoothness was favorable.
- the acrylic rubber according to the present embodiment satisfies the condition that the viscoelasticity of the acrylic rubber is ⁇ * (100 ° C.) ⁇ 3500 Pa ⁇ s, and further satisfies the condition of LCBindex> 6.0. Even when acrylic rubber satisfying such conditions is used, the productivity of the rubber molded product can be improved.
- the acrylic rubber according to the present embodiment increases the discharge amount of the crosslinked acrylic rubber when the acrylic rubber composition is any of blending 1-1 to 1-3 and 2-1 to 2-3. The length became long and the surface smoothness was good. From these results, when the viscoelasticity condition is satisfied, the productivity of the rubber molded product can be improved even if the blending of the acrylic rubber composition is changed.
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Abstract
Description
η*(100℃)<3500Pa・s (2)
本発明の実施形態に係るアクリルゴムは、(メタ)アクリル酸エステル単量体単位と、架橋性単量体単位とを有し、60℃における複素粘性率η*(60℃)と100℃における複素粘性率η*(100℃)とが、下記式(1)及び下記式(2)を満たす、アクリルゴムである。
η*(100℃)<3500Pa・s (2)
η*(100℃)<3500Pa・s (2)
複素粘性率η*は、動的粘弾性測定装置「ラバープロセスアナライザRPA-2000」(アルファテクノロジーズ社製)を用いて、歪み473%、1Hzにて温度分散(40~120℃)で測定した動的粘弾性である。また、60℃における複素粘性率η*(60℃)は、60℃において測定した動的粘弾性であり、100℃における複素粘性率η*(100℃)は、100℃において測定した動的粘弾性である。
長鎖分岐指数LCBindexは、ラバープロセスアナライザRPA-2000(アルファテクノロジーズ社製)を用いて、歪み1000%、1Hz、100℃にてLAOS(Large Amplitude Oscillatory Shear)を測定したものである。
LCBindex>6.0 (5)
このような条件を満たすアクリルゴムは、押出成形においてアクリルゴム架橋物の吐出量をさらに増加させ、吐出長さを長くすることができるため、押出成形によりゴム成形物を製造する場合にその生産性を向上させることができる。
本実施形態に係るアクリルゴムの製造方法は、(メタ)アクリル酸エステル単量体と架橋性単量体とを、反応触媒、分子量調整剤の存在下で、乳化重合、懸濁重合、溶液重合、塊状重合などの公知の方法を採用して共重合(ラジカル重合)し製造することができる。中でも乳化重合は、アクリルゴムの製造を容易にする観点から、好ましくは低温(100℃以下)で行い、より好ましくは常圧で行う。
また、反応圧力は、アクリルゴムの種類によって適宜調節すればよい。例えば、アクリレート系アクリルゴムの重合反応は常圧下で行われ、エチレン-アクリレート系アクリルゴムの場合は高圧下で行われる。なお、反応圧力を上げると、エチレン-アクリレート系アクリルゴムのような高圧下で重合反応が行われるアクリルゴムは、ゴム重合体の分子量が低くなり、さらに分岐構造が増加するためムーニー粘度が下がる傾向がある。
η*(100℃)<3500Pa・s (2)
また、本実施形態のアクリルゴムの製造方法では、上述した任意の多官能性単量体量、触媒量、分子量調整剤量、反応温度、反応圧力を調整することにより、アクリルゴムの物性を示すムーニー粘度を維持しながら、下記式(4)及び下記式(5)の条件を満たすアクリルゴムを製造することができる。
LCBindex>6.0 (5)
すなわち、本実施形態のアクリルゴムの製造方法を用いれば、押出成形によりゴム成形物を製造する場合にその生産性を向上させることができるアクリルゴムを提供することができる。
本実施形態に係るアクリルゴム組成物は、アクリルゴムと架橋剤とを含有する。
本実施形態に係るアクリルゴム架橋物は、上述のアクリルゴム組成物を架橋してなる。
JIS K6300の未架橋ゴム物理試験法のムーニー粘度試験に従って、測定温度100℃におけるアクリルゴム重合体のムーニー粘度(ML1+4、100℃)を測定した。
ゲル・パーミエーション・クロマトグラフィー(GPC)により、アクリルゴム重合体の重量平均分子量(Mw)および数平均分子量(Mn)を測定した。GPCによる測定は、測定装置として東ソー社製の「HLC-8320」と、カラムとして東ソー社製の分離カラム「TSKgel GMHHR-H」を直列に2本直列に接続したものを用い、カラムサイズ:7.8mmID×30cm、カラム温度:40℃、溶離液:テトラヒドロフラン、流量:1.0mL/分、注入量:50μLの条件で行った。また、検出器は、示差屈折計(東ソー社製、RI-8320)を用いた。なお、重量平均分子量(Mw)、数平均分子量(Mn)は、ポリスチレン換算値として測定した。このとき、分子量標準:標準ポリスチレン、サンプル濃度:0.4mg/mLの条件で、調整した溶液は0.5μmメッシュのフィルターに通し、GPC測定範囲外の高分子量成分を除去している。
上述の重量平均分子量(Mw)、数平均分子量(Mn)から、アクリルゴム重合体の分子量分布(Mw/Mn)を算出した。
ゲル量は、THF(テトラヒドロフラン)不溶解成分量として測定した。THF不溶解成分量は、各アクリル重合体を上記のGPC条件で測定し、得られたピーク面積(mV・sec)を用い下記の式から算出した。
標準試料には、不溶解成分を含まないアクリルゴム(商品名「NipolAR12」、日本ゼオン社製、「Nipol」は登録商標)を用いた。この値が大きいほど、ゲルや超高分子量成分から成るTHF不溶解成分量が多いことを示している。
各アクリルゴム組成物の粘弾性は、動的粘弾性として以下の条件で測定した。
動的粘弾性測定装置「ラバープロセスアナライザRPA-2000」(アルファテクノロジーズ社製)を用いて、歪み473%、1Hzにて温度分散(40~120℃)を測定し、各温度における複素粘性率η*を求めた。この数値が大きいほど、粘度が高いといえる。
ここでは、上述の動的粘弾性のうち60℃における動的粘弾性を複素粘性率η*(60℃)とし、100℃における動的粘弾性を複素粘性率η*(100℃)として、η*(100℃)/η*(60℃)の値を算出した。
ラバープロセスアナライザRPA-2000(アルファテクノロジーズ社製)を用いて、歪み1000%、1Hz、100℃にてLAOS(Large Amplitude Oscillatory Shear)を測定し、LCBindexを求めた。この数値が大きいほど、長鎖分岐が多いといえる。
押出成形機を用いて、アクリルゴム組成物の押出性を下記の条件で確認した。用いた押出成形機の仕様を表1に示す。
アクリルゴムのアクリルゴム組成物としての単位時間当たりの押出重量(g/20秒)を吐出量として測定した。吐出量の値が大きいほど押出量が増加し、生産性が増す(ダイの選択肢が増える等)を示す。
アクリルゴムのアクリルゴム組成物としての単位時間当たりの押出長さ(cm/20秒)を吐出長さとして測定した。ここでは、形状が安定している場合のみを測定対象とした。吐出量の値が大きいほど生産性が増すことを示す。
アクリルゴムのアクリルゴム組成物(押出物)としての表面肌を観察して判断した。押出物の肌が平滑で光沢のあるものが○、平滑ではあるが光沢のないものを△、表面に凹凸やこじわの見られるものを×として評価した。
プロトンNMR測定および重合体アセトン溶液の水酸化カリウム水溶液による電位差測定により、アクリルゴムのモノマー組成を算出した。
Bruker社製の「AV500」、測定溶媒として重クロロホルムを用いた。アクリレート系アクリルゴムの場合は、アクリル酸エチル、アクリル酸n-ブチルはメチルプロトン、アクリル酸2-メトキシエチルはOCH2+OCH3プロトン、メタクリル酸グリシジルはグリシジル基由来のプロトン、ジビニルベンゼンはフェニル基由来のプロトン、エチレングリコールジメタクリレートはエチレングリコール由来のプロトンの強度を用いて組成比を算出した。エチレン―アクリレート系アクリルゴムの場合は、アクリル酸メチルに起因するメチルプロトン、マレイン酸モノエチルに起因するカルボン酸プロトン、エチレンは上記モノマー由来のプロトンを差し引いたプロトンの強度を用いて組成比を算出した。
重合体アセトン溶液と水酸化カリウム水溶液の電位差滴定によってフマル酸モノn-ブチルおよびマレイン酸水素エチルの重量分率を決定した。これらモノマーを使用して得られたアクリルゴムのモノマー組成は、本測定結果にて補正されたNMR測定結果にてモノマー組成の算出を行った。
(製造例1)アクリレート系アクリルゴム(A)の製造
温度計、攪拌装置を備えた重合反応器に、水200部、ラウリル硫酸ナトリウム2部、アクリル酸エチル(EA)94.5部を仕込み、減圧脱気及び窒素置換を3度行って酸素を十分に除去した後、ジビニルベンゼン1.5部およびメタクリル酸グリシジル4部を加えて、常圧下、温度20℃で乳化重合(ラジカル重合)を開始し、5時間反応させ、重合転化率約90%に達するまで重合した。得られた懸濁重合液を塩化カルシウム溶液で凝固させ、水洗、乾燥してアクリレート系アクリルゴム(A)を得た。得られたアクリレート系アクリルゴム(A)は、重合体組成が単量体単位(以下、モノマー単位という場合がある)でアクリル酸エチル94.5%、ジビニルベンゼン1.5%、及びメタクリル酸グリシジル4.0%を含有し、ムーニー粘度が30.0、重量平均分子量(Mw)が412,000、分子量分布(Mw/Mn)が3.22、ゲル量(%)が42%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル28部、アクリル酸n-ブチル(BA)40.8部、及びアクリル酸2-メトキシエチル(MEA)28.7部を使用し、ジビニルベンゼン1.5部の代わりにエチレングリコールジメタクリレート0.5部を使用し、メタクリル酸グリシジルの添加量を2部に変更した以外は、製造例1と同様にして、アクリレート系アクリルゴム(B)を得た。得られたアクリレート系アクリルゴム(B)は、重合体組成がモノマー単位でアクリル酸エチル28.0%、アクリル酸n-ブチル40.8%、アクリル酸2-メトキシエチル28.7%、エチレングリコールジメタクリレート0.5%、及びメタクリル酸グリシジル2.0%を含有し、ムーニー粘度が33.5、重量平均分子量(Mw)が813,000、分子量分布(Mw/Mn)が2.82、ゲル量が29%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル64部、アクリル酸n-ブチル32.9部を使用し、ジビニルベンゼン1.5部に代えてジビニルベンゼン1.1部を使用し、メタクリル酸グリシジルに代えてアリルグリシジルエーテル2部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(C)を得た。得られたアクリレート系アクリルゴム(C)は、重合体組成がモノマー単位でアクリル酸エチル64.0%、アクリル酸n-ブチル32.9%、ジビニルベンゼン1.1%、及びアリルグリシジルエーテル2.0%を含有し、ムーニー粘度が29.0、重量平均分子量(Mw)が600,000、分子量分布(Mw/Mn)が3.00、ゲル量が52%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル64部、アクリル酸n-ブチル33.7部を使用し、ジビニルベンゼン1.5部に代えてジビニルベンゼン1.1部を使用し、メタクリル酸グリシジルに代えてフマル酸モノn-ブチル1.2部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(D)を得た。得られたアクリレート系アクリルゴム(D)は、重合体組成がモノマー単位でアクリル酸エチル64.0%、アクリル酸n-ブチル33.7%、ジビニルベンゼン1.1%、及びフマル酸モノn-ブチル1.2%を含有し、ムーニー粘度が32.0、重量平均分子量(Mw)が810,000、分子量分布(Mw/Mn)が2.99、ゲル量が37%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル64部、アクリル酸n-ブチル23.7部、及びアクリル酸2-メトキシエチル10部を使用し、ジビニルベンゼン1.5部に代えてジビニルベンゼン1.1部を使用し、メタクリル酸グリシジルに代えてフマル酸モノn-ブチル1.2部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(E)を得た。得られたアクリレート系アクリルゴム(E)は、重合体組成がモノマー単位でアクリル酸エチル64.0%、アクリル酸n-ブチル23.7%、アクリル酸2-メトキシエチル10.0%、ジビニルベンゼン1.1%、及びフマル酸モノn-ブチル1.2%を含有し、ムーニー粘度が39.0、重量平均分子量(Mw)が697,000、分子量分布(Mw/Mn)が2.78、ゲル量が60%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル54部、アクリル酸n-ブチル33.7部、メタクリル酸メチル(MMA)10部を使用し、ジビニルベンゼン1.5部に代えてジビニルベンゼン1.1部を使用し、メタクリル酸グリシジルに代えてフマル酸モノn-ブチル1.2部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(F)を得た。得られたアクリレート系アクリルゴム(F)は、重合体組成がモノマー単位でアクリル酸エチル54.0%、アクリル酸n-ブチル33.7%、メタクリル酸メチル10.0%、ジビニルベンゼン1.1%、及びフマル酸モノn-ブチル1.2%を含有し、ムーニー粘度が43.0、重量平均分子量(Mw)が376,000、分子量分布(Mw/Mn)が3.22、ゲル量が80%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル63.9部、アクリル酸n-ブチル32.9部、ジビニルベンゼン1.5部に代えてジビニルベンゼン1.1部を使用し、メタクリル酸グリシジルに代えてクロロ酢酸ビニル2.1部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(G)を得た。得られたアクリレート系アクリルゴム(G)は、重合体組成がモノマー単位でアクリル酸エチル63.9%、アクリル酸n-ブチル32.9%、ジビニルベンゼン1.1%、及びクロロ酢酸ビニル2.1%を含有し、ムーニー粘度が35.0、重量平均分子量(Mw)が800,000、分子量分布(Mw/Mn)が3.02、ゲル量が50%であった。これらの結果を表2に示す。
アクリル酸エチル94.5部に代えてアクリル酸エチル63.5部とアクリル酸n-ブチル34.5部を使用し、ジビニルベンゼン1.5部の代わりにエチレングリコールジメタクリレート0.5部を使用し、メタクリル酸グリシジル4部に代えてフマル酸モノn-ブチル1.5部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(H)を得た。得られたアクリレート系アクリルゴム(H)は、重合体組成がモノマー単位でアクリル酸エチル63.5%、アクリル酸n-ブチル34.5%、エチレングリコールジメタクリレート0.5%、及びフマル酸モノn-ブチル1.5%を含有し、ムーニー粘度が40、重量平均分子量(Mw)が873,000、分子量分布(Mw/Mn)が3.50、ゲル量が21%であった。これらの結果を表2に示す。
アクリル酸エチルの添加量を98部とし、ジビニルベンゼン1.5部の代わりにエチレングリコールジメタクリレート0.5部を使用し、メタクリル酸グリシジルの添加量を1.5部とした以外は、製造例1と同様にして、アクリレート系アクリルゴム(I)を得た。得られたアクリレート系アクリルゴム(I)は、重合体組成がモノマー単位でアクリル酸エチル98.0%、エチレングリコールジメタクリレート0.5%、及びメタクリル酸グリシジル1.5%を含有し、ムーニー粘度が55.0、重量平均分子量(Mw)が838,000、分子量分布(Mw/Mn)が2.53、ゲル量が8%であった。これらの結果を表2に示す。
アクリル酸エチルの添加量を97.9部とし、ジビニルベンゼン1.5部を使用せず、メタクリル酸グリシジル4部に代えてクロロ酢酸ビニル2.1部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(J)を得た。得られたアクリレート系アクリルゴム(J)は、重合体組成がモノマー単位でアクリル酸エチル97.9%、クロロ酢酸ビニル2.1%を含有し、ムーニー粘度が55.0、重量平均分子量(Mw)が1,500,000、分子量分布(Mw/Mn)が2.04、ゲル量が23%であった。これらの結果を表2に示す。
アクリル酸エチルの添加量を97.4部とし、ジビニルベンゼン1.5部を使用せず、メタクリル酸グリシジル4部に代えてクロロ酢酸ビニル2.6部を使用した以外は、製造例1と同様にして、アクリレート系アクリルゴム(K)を得た。得られたアクリレート系アクリルゴム(K)は、重合体組成がモノマー単位でアクリル酸エチル97.4%、クロロ酢酸ビニル2.6%を含有し、ムーニー粘度が50.0、重量平均分子量(Mw)が922,000、分子量分布(Mw/Mn)が4.10、ゲル量が33%であった。これらの結果を表2に示す。
特公昭55-5527の実施例1の重合方法に準じて、重合を行った。得られたエチレン-アクリレート系アクリルゴム(A)は、重合体組成がモノマー単位でアクリル酸メチル(MeAc)55.0%、エチレン39.0%、マレイン酸モノエチル6.0%を含有し、ムーニー粘度が16.5、重量平均分子量(Mw)が241,000、分子量分布(Mw/Mn)が4.25、ゲル量が0%であった。モノマー組成はプロトンNMR測定により決定した。これらの結果を表2に示す。
特公昭55-5527の実施例1の重合方法に準じて、重合を行った。得られたエチレン-アクリレート系アクリルゴム(B)は、重合体組成がモノマー単位でアクリル酸メチル55.4%、エチレン41.0%、マレイン酸モノエチル3.6%を含有し、ムーニー粘度が29.0、重量平均分子量(Mw)が235,000、分子量分布(Mw/Mn)が2.85、ゲル量が2%であった。モノマー組成はプロトンNMR測定により決定した。これらの結果を表2に示す。
バンバリーミキサーを用いて、アクリルゴム100部に、FEFカーボンブラック(商品名「シーストSO」、東海カーボン社製、充填剤、「シースト」は登録商標)55部、
可塑剤(商品名「アデカサイザーRS735」、アデカ社製、「アデカサイザー」は登録商標)1.5部、ステアリン酸2部、エステル系ワックス(商品名「グレッグG-8205」、大日本インキ化学工業社製、滑剤)1部、4,4'-ビス(α,α-ジメチルベンジル)ジフェニルアミン(商品名:ノクラックCD、大内新興化学工業社製、老化防止剤、「ノクラック」は登録商標)2部を添加して、50℃で5分間混合した。次いで、得られた混合物を50℃のロールに移した。これに、架橋剤として2,2-ビス[4-(4-アミノフェノキシ)フェニル]プロパン(商品名「BAPP」、和歌山精化工業社製、架橋剤)1部、架橋促進剤として1,8-ジアザビシクロ[5,4,0]ウンデセン-7-エン(DBU)(商品名「RHENOGRAN XLA-60」、RheinChemie社製、「RHENOGRAN」は登録商標、DBU60%(ジンクジアルキルジホスフェート塩になっている部分を含む)2部を配合し、混練することにより、アクリルゴム組成物を得た。配合例を表3に示す。
架橋剤をアンモニウムベンゾエート(商品名「バルノックAB」、大内新興化学工業株式会社製、「バルノック」は登録商標)1.5部とし、架橋促進剤を使用しない以外は、配合1-1と同様に配合し、混練することにより、アクリルゴム組成物を得た。配合例を表3に示す。
架橋剤を半硬化牛脂脂肪酸ソーダ石けん(商品名「NSソープ」、花王株式会社製)3部、ステアリン酸(極度硬化牛脂)カリウム(商品名「ノンサールSK-1」、日油株式会社製、「ノンサール」は登録商標)0.5部、架橋促進剤を分散性硫黄(商品名「サルファックスPMC」、鶴見化学工業株式会社製、「サルファックス」は登録商標)0.3部とした以外は、配合1-1と同様に配合し、混練することにより、アクリルゴム組成物を得た。配合例を表3に示す。
FEFカーボンブラック55部の代わりにMAFカーボンブラック(商品名「シースト116」、東海カーボン社製、充填剤)80部を使用し、可塑剤(商品名「アデカサイザーRS735」、アデカ社製)の添加量を10部とした以外は、配合1-1と同様に配合し、混練することにより、アクリルゴム組成物を得た。配合例を表3に示す。
架橋剤をアンモニウムベンゾエート(商品名「バルノックAB」、大内新興化学工業株式会社製)1.5部とし、架橋促進剤を使用しない以外は、配合2-1と同様に配合し、混練することにより、アクリルゴム組成物を得た。配合例を表3に示す。
架橋剤を半硬化牛脂脂肪酸ソーダ石けん(商品名「NSソープ」、花王株式会社製)3部、ステアリン酸(極度硬化牛脂)カリウム(商品名「ノンサールSK-1」、日油株式会社製)0.5部、架橋促進剤を分散性硫黄(商品名「サルファックスPMC」、鶴見化学工業株式会社製)0.3部とした以外は、配合2-1と同様に配合し、混練することにより、アクリルゴム組成物を得た。配合例を表3に示す。
製造例1で得られたアクリレート系アクリルゴム(A)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(A)を配合1-2及び配合2-2の条件で配合したアクリルゴム組成物について、それぞれ上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表4に示す。
製造例2で得られたアクリレート系アクリルゴム(B)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(B)を配合1-2の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表4に示す。
製造例3で得られたアクリレート系アクリルゴム(C)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(C)を配合1-2の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表4に示す。
製造例4で得られたアクリレート系アクリルゴム(D)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(D)を配合1-1及び配合2-1の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表4に示す。
製造例5で得られたアクリレート系アクリルゴム(E)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(E)を配合1-1の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表5に示す。
製造例6で得られたアクリレート系アクリルゴム(F)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(F)を配合1-1の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表5に示す。
製造例7で得られたアクリレート系アクリルゴム(G)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(G)を配合1-3および配合2-3の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表5に示す。
製造例12で得られたエチレン-アクリレート系アクリルゴム(A)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてエチレン-アクリレート系アクリルゴム(A)を配合1-1の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表5に示す。
製造例8で得られたアクリレート系アクリルゴム(H)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(H)を配合1-1の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表6に示す。
製造例9で得られたアクリレート系アクリルゴム(I)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(I)を配合1-2及び配合2-2の条件で配合したアクリルゴム組成物について、それぞれ上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表6に示す。
製造例10で得られたアクリレート系アクリルゴム(J)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(J)を配合1-3の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表6に示す。
製造例13で得られたエチレン-アクリレート系アクリルゴム(B)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてエチレン-アクリレート系アクリルゴム(B)を配合1-1及び配合2-1の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表6に示す。
製造例11で得られたアクリレート系アクリルゴム(K)について、上述の動的粘弾性を測定した。また、アクリルゴムとしてアクリレート系アクリルゴム(K)を配合1-3の条件で配合したアクリルゴム組成物について、上述の押出成形機により押出成形し、上述の押出性を測定した。その結果を表6に示す。
Claims (7)
- (メタ)アクリル酸エステル単量体単位と、架橋性単量体単位とを有し、
60℃における複素粘性率η*(60℃)と100℃における複素粘性率η*(100℃)とが下記式(1)及び下記式(2)を満たす、アクリルゴム。
η*(100℃)/η*(60℃)<0.8 (1)
η*(100℃)<3500Pa・s (2) - 長鎖分岐指数LCBindexが、下記式(3)を満たす、請求項1に記載のアクリルゴム。
LCBindex>6.0 (3) - (メタ)アクリル酸エステル単量体単位と、多官能性単量体単位と、架橋性単量体単位とを有し、
100℃における複素粘性率η*(100℃)が下記式(4)を満たし、かつ長鎖分岐指数LCBindexが下記式(5)を満たす、アクリルゴム。
η*(100℃)<3500Pa・s (4)
LCBindex>6.0 (5) - 前記架橋性単量体単位が、カルボキシル基、エポキシ基、およびハロゲン基を少なくとも1つ有する単量体単位である、請求項1乃至3のいずれか1項に記載のアクリルゴム。
- 重量平均分子量Mwが240,000~820,000である、請求項1乃至4のいずれか1項に記載のアクリルゴム。
- 請求項5に記載のアクリルゴムと架橋剤とを含有するアクリルゴム組成物。
- 請求項6に記載のアクリルゴム組成物を架橋してなるアクリルゴム架橋物。
Priority Applications (6)
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EP18748253.4A EP3578580A4 (en) | 2017-01-31 | 2018-01-26 | ACRYLIC RUBBER, ACRYLIC RUBBER COMPOSITION, AND ACRYLIC RUBBER CROSS-LINKED PRODUCT |
JP2018565515A JPWO2018143101A1 (ja) | 2017-01-31 | 2018-01-26 | アクリルゴム、アクリルゴム組成物、及びアクリルゴム架橋物 |
KR1020197021658A KR20190109417A (ko) | 2017-01-31 | 2018-01-26 | 아크릴 고무, 아크릴 고무 조성물, 및 아크릴 고무 가교물 |
SG11201906829SA SG11201906829SA (en) | 2017-01-31 | 2018-01-26 | Acrylic rubber, acrylic rubber composition, and crosslinked acrylic rubber |
CN201880007651.XA CN110234667A (zh) | 2017-01-31 | 2018-01-26 | 丙烯酸橡胶、丙烯酸橡胶组合物和丙烯酸橡胶交联物 |
US16/480,137 US20200002523A1 (en) | 2017-01-31 | 2018-01-26 | Acrylic rubber, acrylic rubber composition, and crosslinked acrylic rubber |
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EP3578580A4 (en) | 2020-07-22 |
JPWO2018143101A1 (ja) | 2019-11-21 |
CN110234667A (zh) | 2019-09-13 |
KR20190109417A (ko) | 2019-09-25 |
US20200002523A1 (en) | 2020-01-02 |
EP3578580A1 (en) | 2019-12-11 |
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