In the past, most of the silicone resin coating products used chlorosilane as the monomer, mainly because of its large yield and low cost, but with the development of the silicone industry, alkoxylsilane gradually replaced chlorosilane, mainly because: SI-OR hydrolysis rate is lower than SI-C1, the reaction is easy to control, good repeatability; The by-product of hydrolysis is alcohol, so that the reaction process can be added less or no organic solvent dilution reactants; No hydrochloric acid is generated in the hydrolysis process, which reduces the corrosion of equipment and the treatment intensity of organic wastewater.At present, in addition to the common silicone monomer, many kinds of silane coupling agents are also used in the synthesis of silicone resin, such as KH 550, KH560 and so on.