Epoxy silanes are widely used as adhesion promoters and cross-linking agents in the coating industry. Epoxy silanes products as additives in formulations or monomers in organic polymerization processes can show good effects on paint films. The pigments pre-treated with epoxy silanes have better dispersibility and adhesion, lower viscosity and stronger hiding power. Therefore, epoxy silanes have gradually become an indispensable part in many aspects of the coating industry.
The product synthesized after epoxy silanes hydrolysis and condensation reaction. In these reactions, the content of malkoxy is maintained at a certain level, and the reactive epoxy groups are retained. These epoxy groups will undergo hydrolysis in the oligomerization reaction, but this side reaction is very small, which only generates a small amount of glycol groups on the oligomer.
Due to the existence of epoxy silanes and organic functional groups, it is still reactive:
1) Coupling with the substrate, other epoxy silanes and siloxane oligomers through the epoxy silane part;
2) Grafting to polymer functional groups through epoxy groups. As a part of the epoxy silanes is condensed into an oligomer form, the alkoxy content in the material is reduced, thereby reducing the reduction of VOC in the entire formulation. In addition, the epoxy silane oligomer is 100% active, so there is no need to add solvents. Compared with monomer epoxy silanes, oligomeric epoxy silanes are not prone to hydrolysis and can be hydrolyzed under certain controllable conditions.