Silicone oil is a kind of polyorganosiloxane with chain structure with different polymerization degrees. It is obtained by hydrolyzing dimethyldichlorosilane with water to obtain the primary polycondensation ring body. The ring body is cracked and rectified to obtain the low ring body, and then the ring body, the capping agent and the catalyst are put together to obtain each A mixture of different polymerization degrees can be obtained by vacuum distillation to remove low-boiling substances.

The most commonly used silicone oil, all organic groups are methyl, called methyl silicone oil. The organic group can also use other organic groups instead of part of the methyl groups to improve certain properties of the silicone oil and apply to various applications. Other common groups are hydrogen, ethyl, phenyl, chlorophenyl, trifluoropropyl and so on. In recent years, organically modified silicone oil has been developed rapidly, and many organically modified silicone oils with special properties have appeared.

Silicone oil is generally colorless (or light yellow), odorless, non-toxic, and non-volatile liquid. Silicone oil is insoluble in water, methanol, glycol and-ethoxyethanol. It is miscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene. It is slightly soluble in acetone, dioxane, ethanol and alcohol. . It has a small vapor pressure, a higher flash point and ignition point, and a lower freezing point. With the difference in the number of segments n, the molecular weight increases and the viscosity also increases. The solid silicone oil can have a variety of different viscosities, from 0.65 centistokes to millions of centistokes. If you want to make low-viscosity silicone oil, you can use acid clay as a catalyst and telomerize at 180°C, or use sulfuric acid as a catalyst to telomerize at a low temperature to produce high-viscosity silicone oil or viscous. Alkaline catalyst.

According to the chemical structure, silicone oil is divided into methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, and methyl trifluoropropane. Base silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxy hydrogen silicone oil, cyanide silicone oil, etc.; from the point of use, there are damping silicone oil, diffusion pump silicone oil, hydraulic oil, insulating oil, Heat transfer oil, brake oil, etc.

Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and small surface tension. In addition, it also has a low viscosity-temperature coefficient and high compression resistance). Some varieties also have radiation resistance. Performance.