Polyvinylpyrrolidone acts as a moisturizing agent for the skin. Polyethylpyrrolidone (PVP for short) is a non-ionic polymer compound, which has good affinity to the skin and can form a non-occlusive film on the skin surface, thus playing the role of moisturizing and moisturizing. If PVP is added to the mask, it can reduce the greasy feeling, and has a good soft and smooth feeling, which can speed up the penetration of the mask ingredients and extend the retention time of the ingredients. Polyvinylpyrrolidone knowledge expansion Polyvinylpyrrolidone is the most distinctive and widely studied fine chemical among n-vinylamide polymers. Has developed into non-ionic, cationic, anion 3 categories, industrial grade, pharmaceutical grade, food grade 3 specifications, relative molecular mass from thousands to more than one million homopolymer, copolymer and crosslinked polymer series products, and with its excellent unique properties have been widely used. PVP is divided into four stages according to its…