Silicone is a different degree of polymerization of the polysiloxane chain structure. It is made dimethyldichlorosilane water hydrolysis condensation in early ring body, ring body by cracking, distillation system, a lower ring body, and then ring body, head agent, the catalyst can be put together to be the telomerization different degree of polymerization of the mixture by vacuum distillation to remove low-boiling silicone oil can be obtained. The most commonly used silicone oil, organic whole as a methyl group, said Shin Gi-silicone oil. Organic groups can also be used in place of some other organic radical methyl group in order to improve certain properties of silicone oil, and the application of various different purposes. Other common group of hydrogen, ethyl, phenyl, chlorophenyl, trifluoromethyl-propyl and so on. In recent years, rapid development of organic modified silicone oil, there have been many with a special performance of the organic modified silicone oil. Silicone is generally colorless (or light yellow), odorless, nontoxic, non volatile liquid. Silicone oil does not dissolve in water, methanol, glycol and - ethoxy-ethanol, with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene immiscible, slightly soluble in acetone, dioxane, ethanol, and the alcohol. It has a very small vapor pressure, high flash point and ignition, a lower freezing point. With the chain segments n of different molecular weight increases, viscosity also increased, the solid this can have a variety of silicone oil viscosity, from 0.65 up to a million cSt cSt. If you want the system is too low viscosity silicone oil, acidic white clay can be used as a catalyst, and the temperature at 180 ℃ under the telomerization, or sulfuric acid as a catalyst at low temperature under the telomerization, the production of high viscosity silicone oil or a viscous material available alkaline catalyst. Silicone oil to be divided according to the chemical structure of 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, methyl trifluoro-propyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxyl hydrogen silicone oil, silicone oil such as cyanide; from the purpose for which points, damping silicone oil, silicone oil diffusion pump, hydraulic oil, insulating oil, heat transfer oil, brake oil. Silicone has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physical inertia and a smaller surface tension, in addition to a low viscosity-temperature coefficient, high resistance to compression) and some varieties resistant to radiation performance.