As we all know, the hydrolysis rate of silane coupling agents depends on the silicon energy group Si-X, and the reactivity with organic polymers depends on the carbon functional group C-Y. Therefore, it is very important to choose a suitable silane coupling agent for different substrates or processing objects. The method of selection is mainly through testing, pre-selection and based on existing experience or laws. For example, silane coupling agents containing CH2=CMeCOVi and CH2-CHOCH2O are often used for unsaturated polyesters: CH2CHCH2O and H2N silane coupling agents are mostly used for epoxy resins: H2N and H2NCONH silane coupling agents are mostly used for phenolic resins. Agent: Vinyl silane is mostly used for polyolefin: Hydrocarbyl silane is mostly used for sulfur vulcanized rubber. Because the bonding strength between different materials is affected by a series of factors such as wetting, surface energy, interface layer and polar adsorption, acid-base interaction, interpenetrating network and covalent bond reaction. Therefore, only testing preselection is sometimes not accurate enough. It is also necessary to comprehensively consider the composition of the material and its sensitivity to the reaction of the silane coupling agent. In order to improve the hydrolysis stability and reduce the cost of modification, the silane coupling agent can be mixed with trihydrocarbyl silane; for difficult-to-stick materials, the polymer cross-linked by the silane coupling agent can also be shared.

Silane coupling agent as a tackifier, mainly through the formation of chemical bonds and hydrogen bonds with the polymer; wetting and surface energy effects: improve the crystallinity of the polymer, acid-base reaction and the production of interpenetrating polymer network. Viscosity is mainly concentrated in three systems: (1) Inorganic materials vs. organic materials; (2) Inorganic materials vs. inorganic materials; (3) Organic materials vs. organic materials. For a kind of bonding, it is usually required to bond the inorganic material to the polymer, so the reactivity of Y in the silane coupling agent with the functional group contained in the polymer should be given priority: the latter two are the bonding between the same type of material Therefore, the anti-hydrophilic polymer and inorganic material of the silane coupling agent itself require the choice of silane coupling agent for viscosity increase.

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