Silicone oil is a polyorganosiloxane with a chain structure of different degrees of polymerization. It is made from dimethyl dichlorosilane and hydrolyzed to obtain an initial polycondensation ring body. The ring body is cracked and rectified to obtain a low ring body. Then, the ring body, the capping agent and the catalyst are put together and fused to obtain each A mixture of different polymerization degrees can be obtained by removing low-boiling substances through distillation under reduced pressure. The most commonly used silicone oil, all organic groups are methyl, called Shenyl silicone oil. The organic group may also use other organic groups instead of part of the methyl group in order to improve a certain property of the silicone oil and be suitable for various uses. Common other groups are hydrogen, ethyl, phenyl, chlorophenyl, trifluoropropyl and the like. In recent years, organic modified silicone oils have developed rapidly, and many organic modified silicone oils with special properties have appeared. Silicone oil is generally colorless (or light yellow), odorless, non-toxic, and non-volatile liquid. 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 and ignition point, and a low freezing point. As the number of segments n is different, the molecular weight increases and the viscosity also increases. The silicone oil can have various viscosities, from 0.65 centistokes to millions of centistokes. If low-viscosity silicone oil is to be prepared, acid clay can be used as a catalyst and telomerized at 180 ° C, or sulfuric acid can be used as a catalyst to perform telomerization at low temperature. High-viscosity silicone oil or viscous can be produced using alkaline catalyst. Silicone oil is divided into methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methylphenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropane according to chemical structure. Base silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxy hydrogen silicone oil, cyanogen silicone oil, etc .; by application, there are damping silicone oil, diffusion pump silicone oil, hydraulic oil, insulating oil, Heat transfer oil, brake fluid, etc. Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertia and small surface tension, in addition, it has a low viscosity temperature coefficient and high compression resistance. Some varieties also have radiation resistance. Performance. Silicone oil can be well used in the production of cosmetics to improve the performance of cosmetics. Silicone oil has a combination of low surface tension and viscosity, which can make other components of cosmetics easily diffuse into a thin film on the skin, and has no sticky feeling. The degreasing property of silicone oil makes it compatible with petroleum jelly, paraffin wax, beeswax, lanolin, etc. The non-sticky product can be obtained through combination. Volatile silicone oil can give cosmetics fast-drying, smooth, anti-staining gloss and other properties. As a cosmetic carrier, it can quickly dissipate and make other cosmetic components into a uniformly distributed film. It is very important in eye cosmetics and nail polish. In hair care products, silicone oil can increase the gloss of the hair, and at the same time it can play a role in styling and prevent hair from sticking together. In shampoo, silicone oil can make Hair is easy to comb. In skin care products, the hydrophobic film formed by silicone oil can prevent other components from being washed away by water, and can keep the skin in normal ventilation. At present, silicone oil has become an important ingredient or auxiliary in many cosmetics.
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