Silane coupling agents were developed by Union Carbide, Inc., and are primarily used in glass fiber reinforced plastics. The molecular structural formula of silane coupling agent is generally Y-R-Si(OR)3(where Y is an organic functional group and SiOR is a siloxy group). The silyloxy group is reactive to inorganic substances, and the organic functional group is reactive or compatible to organic substances. Therefore, when the silane coupling agent is interposed between the inorganic and organic interfaces, a bonding layer of organic matrix-silane coupling agent-inorganic matrix can be formed. Typical silane coupling agents include A151(vinyltriethoxysilane), A171(vinyltrimethoxysilane), A172 (vinyltris (.beta. -methoxyethoxy) silane), and the like.
surface treatment
It can improve the bonding performance of glass fiber and resin, greatly improve the strength, electrical, water resistance, weather resistance and other properties of glass fiber reinforced composite materials, even in the wet state, it is also very significant to improve the mechanical properties of composite materials. The use of silane coupling agents in glass fibers has been quite common, and the silane coupling agents used in this area account for about 50% of the total consumption, among which the most used varieties are vinyl silane, amino silane, methacryloxy silane, etc.
filled plastic
The filler may be surface treated in advance or added directly to the resin. can improve the dispersibility and adhesive force of the filler in the resin, improve the compatibility between the inorganic filler and the resin, improve the process performance, and improve the mechanical, electrical and weather resistance properties of the filled plastics (including rubber).
Tackifier for sealants, adhesives and coatings
can improve the adhesive strength, water resistance, weather resistance and other properties of the composite. Silane coupling agents can often solve the problem that some materials cannot be bonded for a long time. The principle of silane coupling agent as tackifier is that it has two groups; one group may be bonded to the bonded skeleton material; The other group can be combined with polymer materials or adhesives, thereby forming a strong chemical bond at the bonding interface, greatly improving the bonding strength. Silane coupling agent is generally used in three ways: first, as a surface treatment agent for skeleton materials; The second is added to the adhesive, and the third is directly added to the polymer material. From the point of view of giving full play to its efficiency and reducing costs, the first two methods are better.