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Generally, washing hair in depth is the main requirement while people choosing the shampoo formulation. Shampoo surfactants are mainly used to remove grease and dust on the scalp and the hair. Owing to the effect of silicone oil, the current shampoos make people's hair shiny and smooth after washing. Silicone oil is a kind of very good lubricant, which can greatly reduce the friction, make the hair smooth. Now, there are a lot of cosmetics using silicone oil which made of a mixture of various silicon-containing compounds. Therefore, the role and status of silicone oil in shampoo are obvious. In the shampoo formulations, dimethylsilicone fluid and emulsion silicone are the commonly used types. Since dimethylsilicone fluid and silicone emulsion are excellent material for lubricant, so shampoos which joined the dimethylsilicone fluid or silicone emulsion will make the hair light and smooth after washing. It can be seen that the quality of dimethylsilicone fluid and silicone emulsion will fundamentally affect the shampoo quality. Silicone emulsion with stable chemical property, non-volatile, non-flammable, non-corrosive to metal and uneasy to gel while exposed to air for a long time. Its character is white viscous liquid, almost no odor, do not dissolve in water (can be dispersed in water), ethanol, methanol, soluble in aromatic hydrocarbons, aliphatic hydrocarbons and chlorinated hydrocarbons (such as benzene, carbon tetrachloride, etc.). Silicone emulsion widely used in cream, shaving cream, hair conditioner, shampoo, bath detergent, cream and other cosmetics, the effect is very significant. Silicone emulsion has excellent hair conditioning effect, makes the hair supple and elegant. It has good complementarity with the other cosmetics material in cosmetic, helps them to better play the role. Silicone emulsion has good breathability of flavors, sustaining the fragrance of essence, spices, can extend the perfume period. Silicone oil is a kind of different polymerization chain structure polysiloxane. It is made of dimethyl dichlorosilane through hydrolysis to get polycondensation ring body, the ring body by splitting, distill to generate low ring body, then put the ring body, end plate agent, catalyst together to conduct telomerization can be obtained various different polymerization mixtures, finally, removed low boiling substance by reduced pressure distillation. Its properties are colorless (or pale yellow), odorless, non-toxic, non-volatile liquids. Dimethylsilicone fluid is dissolved in water, methanol, glycol and -ethoxyethanol, mutually soluble with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, slightly dissolve in acetone, dioxane, ethanol and butanol. It has a small vapor pressure, high flash point and ignition, lower freezing point. As the number of segments n different, the molecular weight is increased, and the viscosity also increased, thus silicone oil has a variety of different viscosity, from 0.65 centistokes to a million centistokes. To prepare low viscosity silicone oil, acid clay can be used as a catalyst, and telomerization at the temperature of 180?, or used sulfuric acid as a catalyst, telomerization at low temperatures, alkaline can be used as catalysts to produce high viscosity silicone oil or viscous material. Article Source:http://www.cosprm.com
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