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It is made by dimethyldichlorosilane adding water hydrolyze toobtain initial condensation ring body, the ring body by cracking, distillationto obtain the low ring body, then put the ring body, sealing agent, catalysttogether to conduct telomerization will obtain various mixtures which havedifferent degrees of polymerization, by reduced pressure, distillation andremove low boiling composition can be obtained silicone oil. In the most commonly used silicone oil, all theorganic groups are methyl, called methylsilicone oil. Other organic group alsocan be used to instead of part of methyl group to improve certain performanceand make it applied to a variety of different purposes. Other common groupshave hydrogen, ethyl, phenyl, chlorophenyl group, trifluoromethyl group and thelike. In recent years, organically modified silicone oil has rapid development,show up a number of organically modified silicone oil which hasspecial properties. Silicone oil is generally colorless (or paleyellow), odorless, non-toxic, non-volatile liquid. Silicone oil insoluble inwater, methanol, glycol and -ethoxyethanol, mutually dissolved with benzene,dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, slightlysoluble in acetone, dioxane, ethanol and butanol. It has a small vaporpressure, high flash point and ignition point, low freezing point. To obtainlow viscosity silicone oil, used the acid clay as catalyst, and conductstelomerization at 180, or thesulfuric acid as catalyst, conducts telomerization at low temperatures, if wantto produce high viscosity silicone oil or a viscous material can use alkalinecatalyst. According to the chemical structure, the silicone oil series can be dividedinto methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methylhydrogen-containing silicone oil, methylphenyl silicone oil, methylchlorophenyl silicone oil, methyl ethoxy silicone oil, methyl propyl siliconeoil, methyl vinyl silicone oil, methyl hydroxyl silicone oil, ethylhydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil,cyanogen-containing silicone oil and so on. From the applications of view, ithas damped silicone oil, diffusion pump silicone oil, hydraulic oil, insulatingoil, heat transfer oil, brake oil, etc. Silicone oil has excellent heat resistance,electrical insulation, weather resistance, hydrophobicity, physiologicallyinert and smaller surface tension. In addition, it also has a lowviscosity-temperature coefficient, high compression resistance, some of thevarious have the radiation-resistance performance. The main chain of dimethylsilicone oil is composedby silicone atoms, pendant group which attached to silicon are methyl.Viscosity range is 10 ~ 200000mm2/sat 25. Silicone oil is colorless,transparent, non-toxic and odorless oil, which has excellent electricalinsulation properties and heat resistance, high flash point, low freezingpoint, can be long-term used in the temperature range of -50 ~ +200. Siliconeoil has small viscosity-temperature coefficient, big compression ratio, smallsurface tension, good water-repellent moisture resistance, small specific heatcapacity and thermal conductivity. It can be prepared by dimethyl cyclosiloxanesand hexamethyldisiloxane conducted telomerization under the presence of catalysts.Its viscosity was increased by the number of silicone chain sections n in themolecule, from the easily flowing liquid to a thick semi-solid. Has excellentelectrical insulating properties and heat resistance. Used as a long-term release agent in the contourmachining of plastic and rubber as well as in food production. It is also usedas high and low temperature lubricant between various materials, manufacturingthe additives of lubricating plastics. Glass, ceramics, metal, cement and otherproducts which treated with dimethylsilicone oil are not only hydrophobic, butalso corrosion resistance, mildew proof, surface smooth. Widely used as heatcarrier and efficient defoamers in the chemical, pharmaceutical, cosmetics material, food and other sectors; used as quakeproof damping material inprecision machinery and instrumentation; used as high-temperature resistancedielectric liquid in the electric appliance and electronics industry. It alsowidely used as polishing agent of automotive, furniture, floor, as well as hydraulicoil of pumps, brakes, cylinders and so on. ArticleSource:http://www.cosprm.com