The use of Co-Formula silane coupling agent additives in water-based coatings can significantly improve the leveling, slip, gloss, anti-adhesive, water resistance, chemical resistance, high temperature resistance, staining resistance and printing resistance of the coating film. The key to the use of Co-Formula silane coupling agent is to have more unhydrolyzed, directly condensable dehydrated, hydrolyzable siloxane group or more hydrolyzable condensable dehydrated silanol group before it reaches the hydroxyl group on the surface of the substrate and reacts with the dehydrated or dehydrated, in order to guarantee the high efficiency of coupling.

I、The effect of Co-Formula silane application in different waterborne coating systems

Waterborne wood coatings: The application of silicone in waterborne wood coatings mainly includes the physical mixing and chemical modification of silicone and resin. A modified silicone polymer for waterborne wood coating additives is greatly compatible with waterborne wood coatings. It can significantly improve the leveling, lubricity, gloss, anti-adhesion and chemical resistance of the coating film. The reaction between organo-functional Co-Formula silane coupling agent and vinyl acrylic acid can synthesize stable silicone acrylate emulsion, and the film has excellent resistance to methyl ethyl ketone scrubbing. Emulsion polymerization with acrylic acid using hindered vinyl silane with slow hydrolysis rate can improve the content of silicone grafting to acrylic resin. And improve the polymerization stability and storage stability of the organosilicon acrylic emulsion, which has excellent acid and alkali resistance, high and low temperature resistance and electrolyte stability.


Water-based coating on metal surface: Deionized water and methanol co-mingled solvent is used as the solvent for silane hydrolysis. Add a certain amount of methanol to the deionized water and stir well on a magnetic stirrer, slowly add the Co-Formula silane coupling agent, adjust the pH=4.5~6 by dropping acetic acid, and continue to stir until the solution is transparent and homogeneous. After reaching the best hydrolysis effect, the aqueous silane solution is coated on the metal substrate by impregnation and then heated and aged to form a silane film at 90-120°C for 15-30 min. A water-based coating is applied to the surface of the silane film to form a composite film of silane hydrolysis and water-based coating. The best concentration of silane film metal pretreatment is 10% when its corrosion resistance is the best. The corrosion resistance of the silane film is proportional to the thickness of the silane, but the thickness of the film is not significantly affected after reaching the optimum. The corrosion resistance of silane hydrolysis and polyacrylic acid emulsion waterborne coating composite film is 4-5 times higher than that of pure polyacrylic acid emulsion waterborne coating film, and the use of silane hydrolysis film can show better adhesion performance of the interrogation layer at the same time.