In the molecule of the silane coupling agent, there are both organic groups that are affinity for organic materials and hydrolyzable groups that are affinity for inorganic materials. Among them, the organic groups have a great influence on the performance of rubber products. Only when the organic group can react with the corresponding organic material can the performance of the rubber material be improved. When the organic group in the silane coupling agent is a non-reactive alkyl or aryl group, it has no effect on polar organic materials, but can be used in non-polar materials (such as silicone rubber, polystyrene, etc.).
Sulfur-containing silane coupling agents are frequently used in the rubber industry, such as TESPT, bis-[(triethoxysilyl)-propyl] disulfide (TESPD or Si75), and γ-mercaptopropyl trimethoxy Base silane (A-189), etc., and the silane coupling agent TESPT is mostly used in tires.
Generally, the principle of choosing silane coupling agent is:
Vinyl silane is mostly used for polyolefin rubber;
Sulfur-containing silane coupling agents (such as Si69 and Si75, etc.) are mostly used for sulfur vulcanizates;
Epoxy resins generally use silanes whose end groups are epoxy or amino groups;
Unsaturated polyesters mostly use vinyl and epoxy silanes.
When choosing a silane coupling agent as an auxiliary agent for rubber materials, in addition to considering the reactivity of the organic groups in the silane coupling agent, the compatibility of the silane coupling agent with organic materials and the storage of rubber materials should also be considered. The impact of stability. Sometimes, it is better to use a composite silane coupling agent or a reaction product of a silane coupling agent and a variety of compounds.
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