A kind of high and low temperature resistant high bonding strength epdm rubber compound and preparation method thereof

Abstract

The invention discloses an EPDM compound with high and low temperature resistance and high bonding strength and a preparation method thereof, comprising the following components in parts by weight: 100 parts of raw rubber, 30-80 parts of reinforcing filler, and 2-2 parts of plasticizer 10 parts, 2-5 parts of anti-aging agent and 3-6 parts of composite vulcanizing agent; Raw rubber includes EPDM and EPDM, and the third monomer of EPDM is VNB; The composite vulcanizing agent includes peroxide, sulfur, Two or more of sulfur carriers or platinum catalysts. The invention can not only significantly improve the heat aging resistance of the rubber material, so that when the rubber product is used under high temperature conditions, it can maintain normal physical and mechanical properties for a long time, but also can ensure that the rubber material has excellent low temperature resistance, avoiding the rubber The problem of hardening and brittleness of the material caused by too low temperature; in addition, it can also improve the bonding performance of the rubber material and the metal, which can meet the requirements for the use of rubber parts and metals, and expand the scope of practical application.

Description

technical field [0001] The invention belongs to the field of rubber materials, and in particular relates to an EPDM rubber compound with high temperature resistance and high bonding strength and a preparation method thereof. Background technique [0002] Terpolymer rubber (EPDM) is a terpolymer made of ethylene, propylene and an unsaturated third monomer (non-conjugated diene). The third monomer of EPDM mainly includes ENB (5-ethylene Base-2-norbornene), DCPD (dicyclopentadiene), HD (1,4-hexadiene) and VNB (5-vinyl-2-norbornene). The molecular structure of EPDM determines that it has excellent aging resistance, chemical resistance, and excellent electrical insulation properties. It is currently widely used in rubber products such as automotive parts, waterproof materials for construction, wires and cables, hoses, tapes, and automotive seals. . Although EPDM has the above-mentioned excellent properties, according to the research and analysis of the inventor, there are also ...

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Problems solved by technology

Although EPDM has the above-mentioned excellent properties, according to the research and analysis of the inventor, there are also certain shortcomings, which limit its popularization and application in some special fields, such as: general low temperature performance, when the vinyl content in the EPDM molecular chain is high, it has Certain crystallinity makes it less elastic at low temperature, even hardens and becomes brittle, and loses practical use value; the molecular structure lacks active groups, and the cohesive energy is low. At the same time, the rubber is easy to bloom, making it self-adhesive and mutual Viscosity deteriorates, which leads to poor bonding performance between EPDM and metal, which limits the application of EPDM in rubber and metal parts; although ordinary EPDM has good high temperature resistance, it can be used at higher temperatures (such as above 150°C) When used for a long time, there are still problems of increased hardness, decreased tensile strength and elongation at break, which makes it unable to be used for a long time under relatively high temperature conditions; in addition, EPDM mainly adopts sulfur vulcanization system and peroxide vulcanization system, phenolic resin vulcanization and radiation vulcanization account for a small proportion, peroxide vulcanization can make EPDM have excellent high temperature resistance and low compression set, but it is not conducive to the bonding performance of EPDM and metal, which limits the application of EPDM in rubber metal Application in parts; when sulfur vulcanization system is used, the bonding performance between EPDM and metal is better, but the heat aging resistance and compression set are poor, and the single vulcanization system cannot meet high temperature resistance, low pressure deformation and high bonding strength at the same time. requirements

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