Silane coupling agent has been successfully used in adhesion promoters and surface treatment agents for decades due to its special structural composition. It has now become an indispensable component in coatings and ink systems. Whether as an additive or as a separate primer, it gives the coating and ink excellent performance.
Application of silane coupling agent in primer: The covalent bond of silicon atoms has the unique ability to combine organic and inorganic materials. The inherently stable structure of silicon oxide makes it an important part of high performance paint primer. Use of silane coupling agent in the primer can improve its adhesion; maintain its humidity, chemical property, UV resistance and improve the dispersion of the filler. Alkoxysilanes are compatible with many organic resins. In fact, silanes are very strong polar solvents, and the polymerization of silanes is used to affect the compatibility and final properties of the polymer. On the surface of organic polymers and inorganic materials (for example, pigments, fillers and glasses, metal surfaces), a large number of organic groups in which the alkoxy functions are coupled in the form of covalent bonds. The organic functional group of the silane produces an excellent effect as long as it finds an organic polymer that matches it.
Application of silane coupling agent in adhesion promoter: When the coating contains a small amount of silane coupling agent, after coating, the silane migrates to the interface between the coating and the substrate, reacts with the moisture on the inorganic surface, hydrolyzes to form a silanol group, and further forms a hydrogen bond or condensed-Si-M (M is an inorganic surface) with the hydroxyl group on the surface of the substrate and the silanol groups between the molecules of the silane are condensed to form a network structure covering the surface of the substrate. The silane coupling agent-modified coating adhered well to the surface of various inorganic substrates even under water immersion conditions. In the interface between the binder and the substrate, the silane interacts with the binder to form a network structure in which the silane and the binder interpenetrate, enhancing the cohesion and resistance to water erosion, and relieving the stress by the modulus. And stress is transferred from a high modulus substrate to a low modulus binder to significantly increase adhesion to the substrate.