Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J119/00—Adhesives based on rubbers, not provided for in groups C09J107/00 - C09J117/00
  • C09J119/006—Rubber characterised by functional groups, e.g. telechelic diene polymers
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L19/00—Compositions of rubbers not provided for in groups C08L7/00 - C08L17/00
  • C08L19/006—Rubber characterised by functional groups, e.g. telechelic diene polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/04—Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• • 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
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons

Definitions

• the invention relates to a temperature-stable, cataphoretically coatable and thermosetting rubber adhesive, which is particularly suitable as an adhesive and sealant in the automotive industry.
• the object was therefore to provide a universally usable thermosetting adhesive suitable for cataphoretic coating for the body-in-white, which is thermostable, i.e. does not fail if the coating temperature is too high.
• the invention thus relates in particular to heat-curing adhesives based on 0H-terminated, liquid polybutadienes with a high graphite content which can be burned over up to 250 ° C.
• Polybutadienes with OH end groups are very suitable for a double crosslinking mechanism, namely firstly for crosslinking via the double bonds by means of a sulfur vulcanization system and secondly for crosslinking via the primary OH groups at the chain ends with the epoxy compound.
• the reaction with the epoxy groups is so efficient and, in contrast to isocyanate crosslinking, thermally irreversible that striking increases in strength can be achieved and even very high curing or overbake temperatures do not lead to negative phenomena, but rather reinforce advantageous properties.
• Butadiene polymers are commercially available products with a number average molecular weight of approximately 1000 to 3500 and OH numbers of 0.7 to 1.7 meq./g and a proportion of the trans isomers in the range of 60%.
• DSC differential calorimetry
• the parts given relate to -100 parts by weight of functional polybutadiene resin with functional hydroxyl groups in the range from 0.7 to 1.7 meq / g and molar masses between about 1000 and 3500.
• polyepoxide compounds is limited to small proportions, preferably 5 to 30 parts, particularly preferably 10 to 20 parts, e.g. of bisphenol A diglycidyl ether, tetraglycidyl isocyanurate and / or hexahydrophthalic acid diglycidyl ester which can be obtained by adding 20 to 50 parts of a tackifier resin, e.g. on the basis of butylated terpene phenol resin, can be modified, whereby the rheological, as well as the toughness and strength properties are improved and cohesive fracture patterns are achieved.
• a tackifier resin e.g. on the basis of butylated terpene phenol resin
• Polybutadiene and epoxy compounds are contained in an equivalence ratio of the functional groups of 1: 0.5 to 1: 1.5, preferably 1: 0.9 to 1: 1.1.
• Suitable epoxy and terpene-phenolic resins can be used or other unsaturated polymers, such as polyoctenamer or LIR (liquid isoprene rubber), can be added. Even pre-adducts of functional, unsaturated rubbers with epoxides can also be used as reinforcing, reactive components.
• the vulcanization or hardener systems of which 3 to 35 parts by weight, preferably 20 to 30 parts by weight, are used, are preferably made from sulfur and commercially available organosulfur hardener compounds from the group thiocarbamates, thiuram disulfides,
• the electrophoretic coatability as a prerequisite for even better weather resistance is achieved by a further, essential component in the rubber adhesive composition according to the invention, the graphite powder, which primarily changes the surface conductivity of the product in the wet state in such a way that the electrophoretic coating is applied over the applied one Glue can be pulled.
• the rheological properties i.e. the flow, demolition and pumpability are optimally influenced, coordinated and the annoying blistering caused by high temperatures can be avoided.
• Mineral fillers are preferred, such as
• Calcium carbonate, calcium oxide, zinc oxide etc. in amounts of 50 to 200 parts by weight, preferably 100 to 150 parts by weight, often mixed with other auxiliary substances such as e.g. Anti-aging agents or pigments.
• the rubber-adhesive composition according to the invention can thus be used without restriction in the temperature range from 150 ° to 250 ° C., preferably from 160 ° to 230 ° C. which is not possible to this extent in comparison to systems of the prior art.
• the rubber-adhesive composition according to the invention with a high graphite content thus fulfills the task, i.e. the combination of high strength and elongation over a wide temperature range, which also includes extremely high temperatures, which is interpreted with the interaction of the two crosslinking mechanisms described, with optimal adhesion to all known automotive substrates, favorable rheological application properties at processing temperatures up to 70 ° C, with optimal storage stability and the ability to paint in a cataphoretic immersion bath and is therefore ideally suited for use in the production of adhesives and sealants in the body-in-white of automobiles.
• Epoxy resin bisphenol A diglycidyl ether, equivalent weight approx. 190 / DOW CHEMICAL.
• Test conditions The tensile shear tests were carried out according to the
• the sheets for the tensile shear tests have the following dimensions: 25x100x0.75mm, the overlap 20mm and the thickness 2mm.
• the elongations at break were determined using the DIN standard 53455.
• Figure 1 DSC curves of Example 1 and 3.
• Figure 1 shows the DSC curve course of a double

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Adhesives Or Adhesive Processes (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6413012

Family Applications (1)

Country Status (3)

Cited By (3)

Citations (2)

Family Cites Families (1)

• 1990
  • 1990-08-27 DE DE4027064A patent/DE4027064C1/de not_active Revoked
• 1991
  • 1991-08-23 DE DE59106825T patent/DE59106825D1/de not_active Expired - Fee Related
  • 1991-08-23 WO PCT/EP1991/001597 patent/WO1992003514A1/de not_active Ceased
  • 1991-08-23 EP EP91914803A patent/EP0496864B1/de not_active Revoked

Patent Citations (2)

Also Published As

Similar Documents

Legal Events