Function of Silane Coupling Agents

Silane coupling agents are our commonly used chemical auxiliary. Do you know all the functions?

Ⅰ. The function of silane coupling agents

1. Cross-linking

Once the silane is grafted into the polymer backbone, it can link the polymer molecules together through the formation of siloxane bonds, thereby creating a three-dimensional network structure. This "cross-linking" is activated by the surrounding moisture, and this activation can be carried out at room temperature. Silane coupling agent can provide coatings, adhesives, sealants and composites with better thermal stability, creep resistance, hardness and chemical resistance.

2. Improve adhesion

Silanes can provide better substrate adhesion to adhesives, sealants and coatings, especially under humid and hot conditions. Silane is usually used to improve the adhesion of glass, minerals and metals. It also has a good effect on difficult-to-handle substrates, such as polyamide, sheet molding material (SMC), acrylic resin, and polyvinyl chloride (PVC).

3. Coupling

Silanes can couple inorganic pigments and fillers with organic resins. Coupling generally improves the moisture and chemical resistance of coatings, adhesives or composites.

4. Scatter

Vinyl silane helps to disperse inorganic pigments and fillers in coatings and sealants. Better dispersion usually results in lower viscosity of the finished product, higher retention of pigments and fillers, and can improve the hiding power of the coating.

Ⅱ. The choice of silane coupling agents

There are many changes in silane coupling agent functions. The most basic point of the selected silane is that it has the reactivity that can react with the resin, so as to realize its value.