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Silane Coupling Agent Selection Principle
Jan 27, 2018

Among the two types of silane coupling agents that have different properties, the Y group is the most important one, which directly determines the application effect of the silane coupling agent. Only when the Y group can react with the corresponding matrix resin can the adhesive strength of the organic adhesive be raised. It is generally required that the Y group is compatible with the resin and capable of initiating the coupling reaction so that for different resins, a silane coupling agent containing an appropriate Y group must be selected.


Polar resins are ineffective when Y is an alkyl or aryl group that is non-reactive, but can be used in the gluing of non-polar resins such as silicone rubbers, polystyrenes and the like. When Y contains a reactive functional group, attention should be paid to its reactivity and compatibility with the resin used. When Y contains amino group, it belongs to catalytic. It can be used as catalyst in the polymerization of phenolic, urea-formaldehyde and melamine formaldehyde. It can also be used as the curing agent of epoxy and polyurethane resin. At this time, the coupling agent fully participates in the reaction and forms a new bond . Amino silane coupling agent is a generic type, with almost all kinds of resin coupling, but the exception of polyester resin. The type of x group has no effect on the coupling effect. Therefore, the silane coupling agents are also referred to as vinylsilane, aminosilane, epoxysilane, mercaptosilane and methacryloxysilane, respectively, depending on the type of the reactive group in the Y group, and these organofunctional silanes Is the most commonly used silane coupling agent.