Long-chain alkyl alkoxy silane is a kind of silicone coupling agent that is widely used now. Its general structure commonly used in cosmetics can be expressed as R—S—X3 (where R is a long chain alkyl, X is usually It is ethoxy group, common ones are octyl triethoxy silane, decyl triethoxy silane, dodecyl triethoxy silane). Alkoxy groups can react with the surface groups of many fillers. They first react with water to generate silanol, and at the same time release ethanol, and then the silanol groups condense with the hydroxyl groups on the surface of the filler, and the adjacent silanes can also react further to form polysiloxane on the surface of the filler.
By introducing long-chain alkyl groups, the lipophilicity of the powder is enhanced, and the affinity with the skin is better. In cosmetics, it can be used as a brightening aid, hydrophobic agent, lubricant, etc., and can give cosmetics excellent skin care, hydrophobic, air-permeable, antioxidant, soft, and anti-adhesive properties. The powder treated with alkyl silicon coupling agent has a strong repulsive effect on oil and water, and is durable. Because it contains long-chain alkyl groups, it has a good affinity with the skin.