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[Chemical Knowledge]：Properties and Uses of Silicone Oil

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Silicone oils generally refer to linear silicone products that remain in a liquid state at room temperature. Generally divided into methyl silicone oil and modified silicone oil two categories. The most commonly used silicone oil-methyl silicone oil, also known as ordinary silicone oil, its organic groups are all methyl, methyl silicone oil has good chemical stability, insulation, good hydrophobic properties. It is made of dimethyl dichlorosilane and water hydrolysis of the initial polycondensation ring, the ring body by cracking, distillation of the low ring body, and then the ring body, head agent, catalyst together to get a variety of different degrees of polymerization of the mixture, the vacuum distillation to remove the low boiling matter can be produced silicone oil.

silicone oil is generally colorless (or light yellow), tasteless, non-toxic, non-volatile liquid. Silicone oil is insoluble in water, methanol, glycol and-ethoxyethanol, can be miscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, slightly soluble in acetone, dioxane, ethanol and alcohol. It has a small vapor pressure, high flash point and ignition point, low freezing point. As the number of segments n is different, the molecular weight increases and the viscosity also increases. The solid silicone oil can have various viscosities.

silicone oils are divided into methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil, cyanide-containing silicone oil, etc. according to their chemical structure. From the point of use, there are damping, diffusion pump silicone oil, hydraulic oil, insulating oil, insulating oil, heat transfer oil, brake oil.

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

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