Silicone oil performance and classification
Silicone oil is a polyorganosiloxane of different degrees of polymerization chain structure. It is made of dimethyldichlorosilane hydrolyzed with water, the ring is made of the low ring through cracking and distillation, and then the ring, the headstock, and the catalyst are put together to form a mixture with different degree of polymerization. The silicone oil can be obtained by distilling off the low boilers under reduced pressure.
Silicone oils are generally colorless (or light yellow), odorless, non-toxic, non-volatile liquids. Silicone oil is insoluble in water, methanol, glycol 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 alcohol. . It has a small vapor pressure, a high flash point and a flash point, and a low freezing point. As the number of segments n differs, the molecular weight increases and the viscosity increases, so that the silicone oil can have various viscosities. If low-viscosity silicone oil is to be produced, acid 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, and telomerization can be carried out at a low temperature to produce a high-viscosity silicone oil or a viscous substance which can be made alkaline catalyst.
Silicone oil is divided into methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl according to chemical structure. Base silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxyl hydrogen silicone oil, cyanide-containing silicone oil, etc.; from the use, there are damping silicone oil, diffusion pump silicone oil, hydraulic oil, insulating oil, Heat transfer oil, brake oil, etc.
Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness and small surface tension. In addition, it has a low viscosity temperature coefficient and high compression resistance. Some varieties also have radiation resistance. Performance.