Silicone surface-treated powder is currently the most widely used surface-treated powder, and is widely used in powders, eye shadows, blushes, liquid foundations and other products. Silicone-treated powder has siloxane molecules chemically bonded to the surface of the powder particles, so it has excellent waterproofness, ductility, fluidity, dispersion and adsorption, and has a delicate and smooth skin feel. Especially when used in silicone oil systems, it can achieve good results.
Except for the most basic silicone oil polydimethylsiloxane, this category is further subdivided as follows:
Hydrogen-containing polydimethylsiloxane
Hydrogen-containing silicone oil has been used as a surface treatment agent for a long time. Because it contains a certain number of relatively active Si-H bonds, it can react with chemical substances containing double bonds, hydroxyl groups and other active groups under the action of a catalyst to form Various silicone products with various special functions are cross-linked on the surface of various substrates to form waterproof films. However, if a catalyst is not used, it needs to react at high temperature and takes a long time, so it is not widely used in the domestic market.
The characteristics of powder treated with this type of surface treatment agent are outstanding hydrophobicity, resistance to skin sweat and oil secretion, long retention time on the skin, and good dispersion in oil media with extremely low polarity. The disadvantage is that active groups may remain and hydrogen may be released under alkaline conditions, so it is not suitable for some products.
Powder treated with this type of surface treatment agent tends to be more closely bonded with the powder, and generally exhibits a thin and even skin fit, with a unique smooth skin feel.
Lotion products
Pre-prepared lotion products are more convenient and environmentally friendly to use. And it can be modulated into various types according to needs, providing more choices.
Dimethiconol
Hydroxy silicone oil is used as a surface treatment agent. Its Si—OH bonds can directly react chemically with the—OH bonds on the surface of the powder, and the bond is relatively strong.
Fluorinated silicone oil
Fluorine-containing silicone oil is very popular among researchers because of its unique structure and its high temperature resistance, strong stability, and friction resistance. Powders treated with it often also show good solvent resistance and wear resistance. It has wiping properties and is used in cosmetics so that the makeup can be maintained for a long time and is not easy to fade.
