Basics of silicone oil

Fluid is a different degree of polymerization chain structure polyorganosiloxane. It is a polycondensation annulus prepared by dimethyldichlorosilane water hydrolysis, the annulus by cleavage, distillation obtain the lower ring body, then put the annulus, end plate agent, catalyst together telomerization can get different degrees of polymerization mixture, through reduced pressure and distillation to remove low-boiling-point substance can be prepared silicone oil.

The most common silicone oil, all organic groups are methyl, called methyl silicone oil. Organic groups may also be used other organic groups instead of part of methyl group, in order to improve certain properties of silicone oil and suitable for a variety of different purposes. Other common groups have hydrogen, ethyl, phenyl, chlorophenyl, trifluoropropyl. In recent years, organic modified silicone oil rapidly developing, there are a number of organically modified silicone oil with special properties.

Dimethicone is a transparent liquid, non-toxic, non-corrosive, with physical inertia. It also has excellent cold resistance, heat resistance, oxidation resistance, can be long-term used in -50℃ ~ 200℃ temperature range. Small viscosity-temperature coefficient, good dielectric properties, has good electrical insulation properties. In addition, it also has a strong shear resistance and good light transmission, low surface tension, good increased water moisture resistance, low volatility and other characteristics. Widely used as insulation, lubrication, shock, dust oil, dielectric fluid and heat carrier, and as anti-foaming, stripping, paint additives and cosmetic raw materials. Used in industrial circulating cooling water system cleaning and pre-film process, clear the foam produced by add the drug which can produce a lot of foam.

Silicone oil are generally colorless (or pale yellow), odorless, non-toxic, non-volatile liquids. Silicone oil is insoluble in water, methanol, glycol, and ethoxyethanol, immiscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, slightly soluble in acetone, dioxane, ethanol and the like. It has a small vapor pressure, high flash point and ignition, lower freezing point. As the number segments n different, the molecular weight increases, the viscosity also increases, thus silicone oil can have a variety of different viscosity, from 0.65 centistokes up to a million centistokes. To obtain a low viscosity silicone oil, used acid clay as a catalyst, and telomerization at 180℃, or used sulfuric acid as a catalyst, telomerization at low temperatures, produce high-viscosity silicone oil or paste can use alkaline catalysts.

Silicone oil, according to the chemical structure have dimethyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl with hydrogen silicone oil, methylphenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, trifluoromethyl propyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxyl hydrogen silicone oil, cyanide silicone oil, etc.; according to the applications have the damping silicone oil, diffusion pump silicone oil, hydraulic oil, insulating oil, heat transfer oil, brake oil and so on.

Silicone oil has excellent heat resistance, electrical insulation property, weather resistance, hydrophobicity, physiologically inert and smaller surface tension, in addition to having a low viscosity-temperature coefficient, high resistance to compression) and some species also have the radiation resistant performance.

Source:http://www.cosprm.com

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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