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WO1995028437A1 - Corps de moulage monobloc reactif en matiere fusible et son procede de production - Google Patents

Corps de moulage monobloc reactif en matiere fusible et son procede de production Download PDF

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Publication number
WO1995028437A1
WO1995028437A1 PCT/EP1995/001272 EP9501272W WO9528437A1 WO 1995028437 A1 WO1995028437 A1 WO 1995028437A1 EP 9501272 W EP9501272 W EP 9501272W WO 9528437 A1 WO9528437 A1 WO 9528437A1
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WO
WIPO (PCT)
Prior art keywords
reactive
body according
melting
shaped body
backbone
Prior art date
Application number
PCT/EP1995/001272
Other languages
German (de)
English (en)
Other versions
WO1995028437B1 (fr
Inventor
Rudolf Hinterwaldner
Harald Braun
Original Assignee
Novamelt Research Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novamelt Research Gmbh filed Critical Novamelt Research Gmbh
Publication of WO1995028437A1 publication Critical patent/WO1995028437A1/fr
Publication of WO1995028437B1 publication Critical patent/WO1995028437B1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C39/021—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles by casting in several steps
    • B29C39/025—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles by casting in several steps for making multilayered articles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4202—Two or more polyesters of different physical or chemical nature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2170/00—Compositions for adhesives
    • C08G2170/20—Compositions for hot melt adhesives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2190/00—Compositions for sealing or packing joints

Definitions

  • the invention relates to a one-piece melt mass molded body made of reactive, chemically setting backbone: binders or polymers, which hardens or crosslinks after heating and simultaneous mixing.
  • hotmelt adhesives which can be reversibly liquefied by means of heat and solidify or set again on cooling
  • hotmelt adhesives which can be reversibly liquefied by means of heat and solidify or set again on cooling
  • Such enamels include in the adhesive monographs by Ralf Jordan “Schmelzklebstoffe” Vol. a - 4c, Hinterwaldnererlag, Kunststoff 1985/87 or G. habenicht “Kleben”, Springer-Verlag, Berlin-Heidelberg, 2nd edition (1990), p. 139 ff.
  • Enamel compositions are also 100% solid systems and do not require any drying processes to set or solidify, as they are solvent-free and / or water-free. They are constructed on the basis of thermoplastic backbone polymers which have a thermally reversible nature and are thermosensitive.
  • melt masses in particular the hot melt adhesives, are processed - in industrial applications from granules or
  • Moisture-curing hotmelt compositions in particular hotmelt adhesives, are also known in the prior art. These include built on the basis of polyurethanes as a backbone binder.
  • the chemical setting reaction is started after the mass has cooled and solidified by the ambient humidity, e.g. Air, initiated.
  • the rate of chemical curing or crosslinking in order to cure or crosslink a layer is a function of time, moisture and / or diffusion, which generally takes from several days to a week. Lying e.g. If the moisture content in the environment is below or above critical threshold values, either chemical setting is completely prevented or there are no sufficient cross-linking bridges for the expected strength in a structural matrix.
  • the part geometry in principle requires access to moisture in order to be able to carry out the chemical reaction at all.
  • moisture-curing enamels require moisture-proof packaging containers, to which additional moisture-absorbing substances have to be added in order to protect them against premature setting or hardening during storage and transport.
  • Polymers are generally poor heat conductors and in some cases have relatively high melting points and / or softening ranges, high amounts of thermal energy are required in order to convert them quickly from the solid to the liquid state. * Therefore, they must preferably be softened or liquefied at temperatures of 150 to 250 ° C. in order to be able to wet surfaces.
  • thermoplastics Due to their low thermal conductivity, thermoplastics in particular are also thermosensitive and tend to tend relatively quickly, among other things. for degradation and cracking, which is described in the professional world with the term "heat history”.
  • the backbone polymers or binders lose functional properties and strengths, and toxic degradation products and gases can additionally be formed.
  • the physically setting enamel compositions have further disadvantages, which include the following are:
  • the sensitive dosing and mixing devices Due to the short pot life, the sensitive dosing and mixing devices have to be rinsed with a component at least once per shift so that the mixing chamber and the product-carrying valves do not become blocked by polymerized and / or through-polymerized components and cause long downtimes.
  • Such very expensive melting, dosing and mixing devices can only be installed in sensitive high-tech areas, where a high level of maintenance is technically and economically justified for the use of expensive structural melting compounds.
  • These costly melting, dosing and mixing devices for 2-component reaction melt compositions are not yet offered as a closed unit on the system market. They have to be created individually from individual units and functional parts.
  • DE-PS 23 22 806 describes an adhesive and sealing compound consisting of a shaped body consisting of two strips lying side by side. This is a kneadable mass that is reactivated when the two strips are kneaded and then hardens.
  • These one-piece moldings have a number of disadvantages, which include the following are:
  • the invention relates to a one-piece, storage-stable, meltable, chemically reacting molded body for forming a coating, adhesive and / or sealing compound, consisting of
  • meltable, reactive compound (s) used for curing or crosslinking
  • a) and b) optionally other known additives, - 6 - wherein a) and b) have different melting and / or softening ranges and harden or crosslink to a thermoset after melting and mixing.
  • the shaped body has a cylindrical, conical, cubic, cuboid, spherical, pearl, strip and / or platelet shape.
  • At least one of the reactive constituents in particular in the case of highly reactive compounds, to be microencapsulated.
  • the homogeneous distribution of the reactive constituents in the shaped body according to the invention is improved in that at least one of the reactive constituents is embedded in the mass in the form of a sphere and / or beads.
  • a further preferred embodiment of the shaped body according to the invention is that at least one of the reactive components is embedded in the mass as a round profile or strip.
  • the molded body according to the invention can also be a two- or multi-layer laminate or sandwich composed of the reactive constituents a) and b).
  • the molded body is coated with at least one of the reactive components.
  • the reaction of the reactive constituents of the molded article according to the invention is initiated by melting and mixing, which then chemically set, harden or crosslink by polymerization, polyaddition and / or polycondensation.
  • the backbone binders for producing the molded articles according to the invention are thermoplastic and / or meltable polymers. Backbone binders are particularly preferred
  • addition-setting polymers such as epoxy, polyurethane, isocyanate, polyamide resins and / or reactive derivatives thereof,
  • RIX - C -, - C - 0 -, - CH -, - CH 2 -, - 0 -, - N -
  • R H, - a C. - C. alkyl radical, halogen or - CN mean, have and / or
  • Polycondensing polymers such as urea, melamine, phenol, cresol, novolak, resorcinol resins and / or their copolymers.
  • Particularly preferred backing binders have a dual functionality. That they contain reactive groups that bind via polyaddition, polymerization and / or polycondensation. Examples include polymers that contain both reactive epoxy and unsaturated groups or double bonds.
  • the integral compositions can contain fillers, pigments and / or binders. If they also contain foam and blowing agents, end products with low density are created.
  • the moldings according to the invention are equipped with reversible and / or irreversible temperature measurement colors.
  • the method for producing a one-piece molded body according to the present invention is characterized in that a hollow body is produced from a higher-melting or softening reactive component and the resulting cavity is filled with a melting or softening reactive component.
  • a further process for producing a one-piece molded body is characterized in that a hollow profile is drawn from the components a) or b) and the cooled and solidified continuous tube is then filled with the components a) or b).
  • One-piece moldings according to the present invention can be produced by mixing in or coating the higher-melting, still solid, small-sized constituents into the low-melting, liquid reactive constituents.
  • the one-piece, meltable and reactive moldings according to the present invention consist of at least 2 reactive components which are capable of polymerization, polycondensation and / or polyaddition with one another in the liquid state.
  • the reaction components are solid and have a non-tacky surface. Only when heated above their own melting points do they begin to flow and change to a liquid state. Since the individual reaction components have different and / or diverging melting points, this physical property is an essential key to solving the problem according to the invention. If the gradual gradations of the melting points are used to produce the moldings according to the invention, only at least one of the reaction components has to be in the liquid and the other in the solid state.
  • An (initial) polymerization (interfacial polymerization) to be observed at the interfaces of the reaction components is desired according to the invention and contributes to the stability of the shaped body, because at least partial adhesion points form between components A and B (backbone binder and hardener or vice versa).
  • the moldings according to the invention can be produced economically using different process technologies.
  • a hollow profile is produced in a mold from the higher melting reaction component.
  • This form consists of a cooling medium tube and a jacket tube and the liquid reaction component is introduced on the front side between the two tubes.
  • the cooling medium tube provided with the release agent is removed and the hollow core of the casting is poured out with the low-melting reaction component.
  • the molded body is removed from the mold.
  • the demolding can be carried out by simply heating the metal mold surfaces instead of using a release agent. Hollow profiles that are then filled can be produced in an analogous manner.
  • the procedure is the reverse.
  • the low-melting reaction component is liquefied by means of heat and placed in a mixing room.
  • the high-melting particles are introduced into the liquid reaction component in the form of solid particles, mixed homogeneously and then converted into moldings by casting, molding and the like, with simultaneous cooling.
  • the solid particles of the higher-melting reaction components can have the form of microspheres, microcapsules, beads, granules, platelets, and the like.
  • Both components are extruded in a coextrusion line as endless strands, with no mixing of the two components.
  • the Nukem microsphere technology from Nukem GmbH in D-63755 Alzenau is particularly suitable for producing homogeneous, one-piece microspheres with diameters of 50 to 4000 ⁇ m from reaction components A and B.
  • microspheres with homogeneous diameters are prefabricated from the higher-melting component and then coated in the melt of the low-melting component.
  • the coated microspheres - 11 - are then immediately cooled, for example in a cold protective gas stream (N "or the like.). This production can take place in a continuous process technology.
  • the dimensioning of the void volumes in the molded articles according to the invention are determined by the mixing ratios of the respective reactants. Depending on the reaction components, mixing ratios between 99: 1 and 10:90 are possible. Mixing ratios between 10: 1 to 1: 2 are particularly preferred, as a result of which sufficient mixing of the reaction components is ensured during application.
  • the one-piece, meltable and reactive moldings according to the invention can be economically produced from two-component or multi-component hotmelt compositions, in particular hotmelt adhesives. They can have cylindrical, conical, cubic, cuboid, pearl, plate, and / or stripe form. The cylindrical, pearl and / or strip shapes are particularly preferred because they can be processed on known melt guns. The lengths and cross sections of the moldings according to the invention can be variable.
  • 1 to 5 show examples of the reactive moldings according to the invention made of hotmelt compositions, in particular hotmelt adhesives, but are not limited to these.
  • Fig.l 1-piece, reactive, round shaped body, consisting of at least 2 reactants, with a variable diameter as an endless strand, cylinder, stick or disc.
  • Fig .3 1-piece molded body, consisting of at least 2 reaction substances, with a square or rectangular base as an endless strand, in an elongated form or as platelet granules; the second component has a square or rectangular base.
  • Fig .3 1-piece molded body consisting of at least 2 reactants, endless or cut to length as a triangular, 1/4 to 1/2 circular or round base.
  • Fig. 5 One-piece beads or microspheres, of which the higher melting component is coated with the lower melting component.
  • Suitable backbone polymers or binders include the following, which are listed below according to their curing or crosslinking principle.
  • epoxy resins for example bisphenol A diglycidyl ether, phenol novolak glycidyl ether, N, N diglycidylaniline, cycloaliphatic, heterocyclic and aliphatic epoxy resins; Polysulfides, polyurethane resins, silicone resins, polyamides, polyimides, polyols, polyesters and polyisocyanates; Polycondensation: aldehyde condensation resins, such as urea, melamine, phenol and novolak resins
  • Polymerization acrylic and / or methacrylic resins, unsaturated polyester resins and epoxies.
  • the compounds used for curing or crosslinking are monomeric and / or polymeric reactants, reaction initiators and / or reaction accelerators, depending on the particular types of reaction. Typical examples of this are:
  • Polyaddition For the conversion of epoxy, hydroxyl and / or isocyanate group-containing backbone binders are suitable, inter alia.
  • Compounds which carry active H atoms such as polyamides, polyimides, polyamines, azines, carbamides, carboxylic acids, mercaptans, hydrogen silicates, isocyanates.
  • acidic hardener components e.g. Phosphoric acid, p-toluenesulfonic acid, phthalic acids, maleic acids
  • alkaline hardener components such as amine and ammonium salts, compounds containing aldehyde groups.
  • reaction initiators such as organic peroxides, per compounds, organometallic compounds, Lewis and / or protonic acids and / or bases, for example BF 3 complexes, imidazoles, tertiary amines, photosensitizers.
  • the individual reactive components of the moldings according to the invention can contain further additives.
  • additives include plasticizers, flexibilizing substances, waxes, fillers, adhesion promoters, pigments and dyes in order to give them characteristic features and / or specific properties, if necessary.
  • the nature of these additives is primarily determined by their compatibility with the backbone polymers or binders and the compounds used for curing or crosslinking.
  • thermophilic dyes and / or pigments are particularly suitable for coloring, which also includes the temperature measurement varnishes, temperature measurement inks, temperature indicators and liquid crystals. They are summarized below under the term "temperature measuring colors”.
  • the temperature measurement colors change their characteristic hue reversibly or irreversibly at specific temperature values.
  • the reversible and / or the temperature measurement colors having several color change points are particularly preferred because, among other things, in the application of the moldings according to the invention
  • the selection criteria that are placed on the temperature measurement colors for use in the reaction co-pi ⁇ ten of the moldings according to the invention include depending on:
  • the temperature measuring inks integrated in the hardened or crosslinked melt masses, in particular hot melt adhesives, can then also take over essential control functions if they
  • a predetermined limit in temperature resistance is exceeded and / or b) in the case of adhesive bonding, in particular in the case of structural adhesive compounds, the adhesive layer is damaged or destroyed because the temperature is too high and / or too long, and the adhesive joint opens.
  • This fact provides an additional security check when monitoring aging and long-term behavior.
  • the temperature measurement colors are usually based on copper, cobalt, nickel, chromium, vanadium, molybdenum or uranium salts. Examples include: - Ni (NH 4 ) P0 4 . 6 H 2 0 ( ⁇ 120 ° C light green -> gray)
  • the moldings according to the invention can be used in many areas of technology, the commercial economy, handicrafts and home improvement. Due to the one-tier application form and the secure processing in known or modified melting devices, e.g. Hot-melt or hot-melt adhesive guns, the molded articles according to the invention offer the skilled worker and the non-specialist a high level of safety in processing and application, with a pronounced economy. At the same time, the moldings according to the invention make an essential contribution to occupational hygiene and environmental protection because
  • the moldings are solid and
  • a large number of materials and / or substrates can be coated or coated, connected to and with one another, fastened and / or sealed with the shaped bodies according to the invention from the reactive melt compositions.
  • the materials and / or substrates can include metals such as steel and aluminum; inorganic materials such as stones, concrete, glass and ceramics; Elastomers; Plastics such as thermoplastics and thermosets; Wood and wood materials; Foils, plastic laminates; textile materials, paper, cardboard and the like.
  • Such tasks for connecting, fastening, sealing, filling, covering and / or filling are available in many areas of research, industry, assembly, home and handicraft. This includes the construction industry with civil engineering and interior construction; wood and plastics processing industry; Vehicle, ship and aircraft construction, machine and apparatus construction, also many areas of home and handicraft, assembly, installation and repair.
  • the 2-component hot melt adhesive (Curemelt 570/100 from Union Camp) had the following characteristics:
  • Component A (polyamide)
  • Component B epoxy resin
  • the mold for producing the molded body according to the invention by means of the casting technique consisted of a jacket tube and a medium tube which was closed at one end by means of a plate.
  • the shape is made of stainless steel.
  • the medium pipe was not firmly connected to the jacket pipe and was therefore easily removable.
  • the inn e re surface of the jacket tube and the & ⁇ .3ere surface of the medium pipe is provided with an epoxidized isoolefin as a release agent (eg, Permethyl 100 epoxides, Permethyl Corp., Pottstown, PA, USA) and assembled.
  • the cavities had the following volumes:
  • a hollow molded body was first produced in such a way that the polyamide resin was heated to 190 ° C. and the melt produced was introduced into the cavity between the jacket and carrier pipe via the end face. After filling this cavity without bubbles, the mold was placed in a cold water bath for cooling. The medium pipe was used for faster solidification of the Blown cold air. As soon as component A had cooled and solidified, the medium pipe was removed from the
  • the cavity created in the casting - after removing the medium pipe - was then cast and filled with component B (epoxy resin) heated to 100 ° C.
  • component B epoxy resin
  • the mold was constantly cooled until the core of the molded body solidified. Finally, the mold was removed.
  • the resulting shaped body had a diameter of 11 mm and was cut to lengths of 90 mm.
  • cut-to-length shaped bodies also called sticks or cartridges in practice, were placed in a commercially available hot-melt adhesive handgun and then processed by melting and squeezing.
  • Example 1 is repeated with the following modifications that components A and B form a polyurethane system and are colored with dyes.
  • the moldings according to the invention have the following composition:
  • Component A was colored at a temperature of 125 ° C. by adding 0.05% by weight of the temperature measuring color with the formula Cu (CNS) 2 '2 pyridine. It has 2 temperature-dependent color change levels, namely
  • Component B was colored with 0.01% by weight of a normal blue azo dye.
  • the melt which was pressed out was highly viscous and of a slightly greenish blue color. A sign that the melting and processing temperature was too low, there was no homogeneous mixture.
  • the test specimens bonded to them showed a high coefficient of variation of 25% in their strength values - tensile strength 20 N / mm - and on average 20% lower tensile strengths.
  • the pressed melt had an average viscosity of approx. 14,000 to 16,000 mPa.s and a uniform green color.
  • the green hue was created from the yellow hue of the temperature measuring color and the blue azo dye.
  • the test specimens glued to it provided tensile strength values of 20 to 22 N / mm 2 .
  • the melt that was pressed out was colored black. A visual sign that the possible processing temperature was exceeded and that thermo-oxidative damage or degradation of the hot melt adhesive is to be expected. The assumption was confirmed in the strength tests. The values were on average 25% lower than at the application temperature of 140 ° C. It has thus been possible to prove that temperature measuring colors in the molded body according to the invention are a useful aid for quality and mixing control.
  • Another shaped body according to the invention was produced by mixing solid particles into a melt.
  • the solid particles were so-called microspheres.
  • a melt made of an epoxy resin e.g. N, N, N ', N' -Tetraglycidyl- c * , C ⁇ -. , -bis- (4-aminophenyl) -p-diisopropylbenzene (FP 50 ° C), like Epikote ⁇ 1071 from Shell Chemical at approx. 80 ° C kept constant.
  • microspheres with a diameter of 50 ⁇ m prefabricated from OL, ⁇ (-bis- (4-aminophenyl) -p-diiso-propylbenzene (FP 164 ° C.), like Epikure * - '1061 from Shell Chemical, become the melt in equimolar proportions This mixture is used to produce sticks 90 mm long and 11 mm in diameter in a simple round hollow mold made of stainless steel.
  • Example 2 In repetition of Example 1, ⁇ f * - t rf -bis- (4-aminopheynl) -p-diisopropylbe ⁇ zol (Epikure * - '1061). a hollow body is made by casting from the melt (180 - 185 ° C) and demolded after cooling. The cavity was then filled with the epoxy resin "Epikote w 1071" from its melt (80 ° C) and brought to cool.
  • a molded article according to the invention was produced from a novolak epoxydimethacrylate (FP 60 ° C) and a microencapsulated Dib ⁇ zoylperoxid with a wall material made of a polymer wax (FP 110 ° C) by " mixing at 70 ° C and then pouring into a one-piece mold The molded body produced was melted in a hot melt handgun at 170 ° C. and the melted mass was applied to a cleaned steel surface via a slot die. The coating layer had reached a degree of crosslinking of 90% after 15 minutes.
  • Example 1 is repeated in such a way that one-piece beads in sizes of 50-100 ⁇ m are produced from components A (Curemelt 570) and B (Curemelt 100). These one-piece beads are produced in two process steps. Beads or microspheres are prefabricated from the higher-melting polyamide (Curemelt 570). These have diameters from 50 to 60 ⁇ m. These polyamide microspheres are continuously fed to the coating bath from the epoxy resin melt (Curemelt 100). The melt has a temperature of 75 ° C. The polyamide microspheres - in free fall - migrate through the melt, the coating with component B taking place in the required ratio of 10: 1.
  • the coated microspheres are continuously removed from the bottom of the melting tank and immediately cooled in a cold protective gas stream (N 2 ) with a temperature of -10 ° C. and collected in a container as one-piece beads with diameters of 60 to 80 ⁇ m.
  • N 2 cold protective gas stream

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne un corps de moulage monobloc, stable au stockage, pouvant réagir chimiquement, pour former une matière de revêtement, un adhésif et/ou une matière d'étanchéité, qui comprend (a) un ou plusieurs liant(s) troncs réactif(s), fusible(s) et/ou thermoplastique(s) (b) un ou plusieurs composé(s) réactif(s) fusible(s) participant au durcissement ou à la réticulation et éventuellement (c) d'autres additifs connus, où (a) et (b) comportent différentes zones de fusion et/ou de ramollissement. Après avoir été fondus et mélangés, (a) et (b) sont durcis ou réticulés pour former un duromère. L'invention concerne également un procédé de production dudit corps de moulage.
PCT/EP1995/001272 1994-04-15 1995-04-07 Corps de moulage monobloc reactif en matiere fusible et son procede de production WO1995028437A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4413113.5 1994-04-15
DE19944413113 DE4413113A1 (de) 1994-04-15 1994-04-15 Einstückiger, reaktiver Schmelzmassen-Formkörper und Verfahren zu seiner Herstellung

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WO1995028437A1 true WO1995028437A1 (fr) 1995-10-26
WO1995028437B1 WO1995028437B1 (fr) 1995-11-30

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DE19750386A1 (de) * 1997-11-13 1999-05-20 Uhu Gmbh Gebrauchsfertige Zweikomponenten-Klebstoffzusammensetzung
DE10201628A1 (de) * 2002-01-16 2003-07-24 Pacomelt Gmbh Verfahren zur Zugabe von Additivmaterialien zu einem aufschmelzbaren Klebstoff und Klebstoffverpackungen
DE102011001619A1 (de) * 2011-03-29 2012-10-04 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Aufbringen eines Klebemittels auf ein Objekt

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DE2413700A1 (de) * 1973-04-09 1974-10-17 Ciba Geigy Ag Lagerstabiles mehrkomponenten-duroplasten-system
JPS6155123A (ja) * 1984-08-27 1986-03-19 Nitto Electric Ind Co Ltd 粉末状エポキシ樹脂組成物の製造方法
JPS63150367A (ja) * 1986-12-15 1988-06-23 Kawashima Kogyo Kk カプセル状の接着剤
WO1992000342A1 (fr) * 1990-07-02 1992-01-09 Courtaulds Coatings (Holdings) Limited Compositions pulverulentes de revetement et procede de fabrication

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CA993169A (en) * 1972-11-02 1976-07-20 Theodore R. Flint Epoxy tape
GB1541560A (en) * 1975-04-04 1979-03-07 Smith & Mclaurin Delayed-tack adhesive compositions

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DE2413700A1 (de) * 1973-04-09 1974-10-17 Ciba Geigy Ag Lagerstabiles mehrkomponenten-duroplasten-system
JPS6155123A (ja) * 1984-08-27 1986-03-19 Nitto Electric Ind Co Ltd 粉末状エポキシ樹脂組成物の製造方法
JPS63150367A (ja) * 1986-12-15 1988-06-23 Kawashima Kogyo Kk カプセル状の接着剤
WO1992000342A1 (fr) * 1990-07-02 1992-01-09 Courtaulds Coatings (Holdings) Limited Compositions pulverulentes de revetement et procede de fabrication

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PATENT ABSTRACTS OF JAPAN vol. 12, no. 421 (C - 541) 8 November 1988 (1988-11-08) *

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