The core raw material of hexamethyldichlorosilane is trimethylchlorosilane, which is a by-product in the production of methyl organosilane. In general, its content accounts for about 1-3% of dimethyldichlorosilane. In the actual production process, methyl chlorosilane enterprises either choose to directly take away trimethyl chlorosilane, or choose to disproportionate the preparation of dimethyl dichlorosilane. The downstream application of hexamethyldisilazane is wide, can be used as silica, diatomite, titanium powder and other surface treatment, improve hydrophobic, reinforcing, tear resistance and other properties. It can be used as a structure control agent in silica gel, silicone oil and silicone resin to improve the hydrophobicity and other properties. It can be used in the organic synthesis of drugs, as the protective agent, catalyst and activator of functional groups. It can be used as polyurethane chain extender to solidify.
According to industry experts' estimates, the global demand for hexamethyldisilazane in 2020 will be about 25,000 tons. Electronic grade six methyl two silazane is often used as photoresist adhesion promoter, often painted with liquid or gas phase in the surface of silicon wafer, was carried out on the silicon wafer surface modification, make its surface properties changed from hydrophilic to hydrophobic, on the one hand, can enhance the adhesion strength of photoresist and silicon, on the other hand can inhibit the invasion of the etching liquid, effectively improve the corrosion resistance.