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Silicone oil

Jun 03, 2018

    Silicone oil generally refers to a linear polysiloxane product that remains liquid at room temperature. It is generally divided into methyl silicone oil and modified silicone oil.

    The most commonly used silicone oil is methyl silicone oil, also known as common silicone oil, its organic group is all methyl, methyl silicone oil has good chemical stability, insulation, hydrophobic properties. It is prepared by hydrolyzing dimethyl dichlorosilane to obtain the initial polycondensation ring. After the ring is cracked and rectified to obtain the lower ring body, the ring body, the capping agent and the catalyst are sorted together to obtain the first polycondensation ring. A mixture of different degrees of polymerization can be prepared by distillation under reduced pressure to remove low boilers.

    Silicone oil is generally a colorless (or light yellow), odorless, non-toxic, non-volatile liquid. Silicone oil is insoluble in water, methanol, diols, 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 butanol. . It has a small vapor pressure, a high flash point and flash point, and a low freezing point. As the number of segments n varies, the molecular weight increases and the viscosity increases, so the silicone oil can have a variety of different viscosities, from 0.65 centistokes up to millions of centistokes. If a low-viscosity silicone oil is to be obtained, acidic clay can be used as a catalyst and telomerization can be carried out at a temperature of 180°C, or sulfuric acid can be used as a catalyst to conduct the polymerization at a low temperature to produce a highly viscous silicone oil or a viscous material that can be used catalyst.

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

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