It is 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 trialkyl silane for use; for difficult-to-stick materials, the polymer crosslinked with the silane coupling agent can also be used together.

1. Silane coupling agent is used as a tackifier

It is mainly achieved by forming chemical bonds and hydrogen bonds with polymers; with wetting and surface energy effects, polymer crystallinity can be improved, and there are acid-base reactions and the formation of interpenetrating polymer networks.

Tackification mainly revolves around 3 systems:

(1) Inorganic materials to organic materials;

(2) Inorganic materials to inorganic materials;

(3) Organic materials to organic materials.

For the first type of bonding, it is usually required to bond the inorganic material to the polymer. Priority is given to the reactivity of Y in the silane coupling agent with the polymer functional group. The latter two belong to the bonding between the same type of materials, so priority is given to the anti-hydrophilic polymer and inorganic material of the silane coupling agent itself.

2. The silane coupling agent selected when the tackification is required

(1) For unsaturated polyester, vinyl, epoxy group and methacryloxy type organic silane coupling agents can be used;

(2) Epoxy group or amino type organic silane coupling agents should be used for epoxy resin;

(3) For phenolic resin, amino or fluorine-based organic silane coupling agents should be used;

(4) Vinyl type organic silane coupling agents should be used for olefin polymer;

For sulfur-vulcanized rubber, mercapto-type organic silane coupling agents should be used.