Silane coupling agent has become one of the important common coating additives, of course, silane coupling agent is also widely used in other fields. The application of silane coupling agent to coatings can improve the product quality of coatings, endow coatings with special functions, and can also reduce product costs when used properly.

When the organic coating contains a small amount of silane, after it is coated, the silane will migrate to the interface between the coating and the substrate, react with the moisture on the inorganic surface, hydrolyze to form silanol groups, and then form hydrogen bonds or condensation with the hydroxyl groups on the surface of the substrate. Synthesis -si0-M (M is the inorganic surface), at the same time, the silanol groups between the silane molecules are condensed and oligomerized with each other, and the film forming a network structure covers the surface of the substrate. Even under water immersion conditions, coatings modified with silane coupling agents adhere well to various inorganic substrate surfaces.

1. Application of silane coupling agent KH171 in water-based coatings

The use of silicone coupling agents in water-based coatings can significantly improve the leveling, smoothness, gloss, anti-adhesion, water resistance, chemical resistance, high temperature resistance, stain resistance and resistance of the coating film. printability, etc.

In water-based wood coatings, the application of silicone mainly includes physical mixing and chemical modification of silicone and resin.

A modified organosilicon polymer for water-based wood coating additives, which has greatly improved compatibility with water-based wood coatings, and can significantly improve the leveling, lubricity, gloss, anti-blocking and chemical resistance of the coating film. A stable silicone acrylate emulsion was synthesized by reacting silane coupling agent KH171 with vinyl acrylic acid.

Emulsion polymerization of hindered vinyl silane with slow hydrolysis rate and acrylic acid is used to increase the content of silicone grafted on acrylic resin, and improve the polymerization stability and storage stability of silicone acrylic emulsion, and this emulsion has good acid and alkali resistance, high and low temperature resistance and electrolyte stability.

2. The role of silane coupling agent KH-792 in water-based coatings

In the interface layer between the binder and the substrate, the silane coupling agent KH-792 interacts with the binder to form a network structure in which the silane and the binder penetrate each other, which enhances its cohesion and stability against water erosion. The stress is transferred from the high modulus substrate to the low modulus binder, thereby significantly improving the adhesion to the substrate.

Silane coupling agent KH-792 treats pigments or fillers so that they can be easily wetted by the binder, and the pigments or fillers are stably dispersed in the binder to prevent precipitation and agglomeration. After the filler surface is modified by silane coupling agent KH-792, the viscosity of the coating is greatly reduced. Even if the addition amount of pigment and filler is increased, the fluidity of the coating will not be affected, which will increase the output of the coating and reduce the production cost. 

With the rapid development of high-performance and high-functional coatings, the application of silicones in functional coatings is gradually increasing, and new and higher requirements are put forward for the performance of coupling agents and their application technology, which requires the development of new Silane with unique properties to achieve excellent application effect, and develop from single use to multiple composite use at the same time.