Silicone oil usually refers to linear polysiloxane products that remain liquid 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 performance. It is made of dimethyldichlorosilane and water hydrolysis to obtain the initial condensation ring, ring by cracking, rectification to produce a low ring, and then the ring, the head agent, the catalyst put together to get a mixture of different polymerization degrees can be obtained, by vacuum distillation to remove the low boiling matter can be prepared silicone oil.
Silicone oil is generally colorless (or light yellow), tasteless, non-toxic, non-volatile liquid. Silicone oil is insoluble in water, methanol, ethylene glycol and 2-ethoxyethanol, and can be miscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, slightly soluble in acetone, dioxane, ethanol and butanol, and easily soluble in benzene, toluene, xylene, ethyl ether and chloroalkanes. It has a small vapor pressure, high flash point and ignition point, low freezing point, and can be used for a long time in the temperature of -50℃-+180℃. With the different number of chain segments n, the molecular weight increases, the viscosity also increases, and the solid silicone oil can have a variety of different viscosity, from 0.65 CST to millions of CST. If you want to produce low viscosity silicone oil, acid clay can be used as a catalyst and telomeric at 180 ° C, or sulfuric acid can be used as a catalyst and telomeric at low temperature to produce high viscosity silicone oil or gunk.
Silicone oil has heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and small surface tension, in addition to low viscosity-temperature coefficient, high resistance to compressibility, and some varieties also have radiation resistance. Strong shear resistance, more than 20 times the compressibility of general mineral oil, is an ideal liquid spring, excellent electrical characteristics, high breakdown voltage resistance, arc resistance, corona resistance, low dielectric loss, but also has good light transmission and non-toxic effects on the human body.