(1) The concept of silane coupling agent: The general formula of silane coupling agent can be expressed as: Y -- R -- SiX3, X and Y are two kinds of active groups with different reaction characteristics. Among them, X is easy to combine firmly (chemically or physically) with glass, clay, silica, metals and metal oxides in inorganic materials; While Y easily with organic produce good combination of resin, rubber, etc (chemical or physical), at the same time, it is because of their molecules exist two functional groups of organic and inorganic, therefore, by silane coupling agent can organic material and inorganic material of these two kinds of nature difference is very big strong together (coupling), to obtain satisfactory adhesion. This is where the silane coupling agent gets its name. According to the number of hydrolyzable groups (i.e. X groups) connected to silicon atoms, silane coupling agents can be divided into three functional types and two functional types. In recent years, polymer silane coupling agents with polymer functional groups have also appeared. In foreign countries, the production of silane coupling agent is mainly controlled by several large companies, in order to form a monopoly, each brand. Therefore, the same product, the market can appear several brands, a variety of names.
(2) Application of silane coupling agent Silane coupling agent was first developed as a glass fiber treatment agent for glass fiber reinforced plastics. Because the silane coupling agent improves the adhesion between the glass fiber and the resin, the mechanical properties of the reinforced plastics are significantly improved. With the rapid development of composite materials, the silane coupling agent has a rapid development in both varieties and yields. In recent years, the use of silane coupling agent to introduce specific functional groups to some materials can improve the surface properties of materials, obtain anti-static, anti-mold, anti-odor, anti-coagulation and physiological inertia, which has become the beginning of new uses of silane coupling agent. Because of the development of many important application fields, silane coupling agent has become an important branch of silicone.