what is polyvinylpyrrolidone pvp

pvp is polyvinylpyrrolidone. Polyvinylpyrrolidone (PVP) is a kind of non-ionic polymer compound. PVP is made from vinyl pyrrolidone (NVP) by bulk polymerization and solution polymerization. In the process of bulk polymerization, due to the viscosity of the reaction system, the polymer is not easy to diffuse, and the polymerization heat is not easy to remove, resulting in local overheating.
Therefore, the obtained product has low molecular weight, high content of residual monomer, and is mostly yellow, and has no great practical value. Solution polymerization is generally used to synthesize PVP in industry.
​There are two main routes for the production of PVP polymerization, the first is the solution polymerization of N-2-pyrrolidone (NVP) in organic solvents, followed by steam stripping. The second route is aqueous polymerization of NVP monomer with water-soluble cation, anionic or non-ionic monomer.
​A crosslinked homopolymer of pure vinylpyrrolidone. Polyvinylpyrrolidone (PVP) has the ability to bind to a variety of substances, such as the various pigments that cause wine and other beverages to discolor. And because of its insolubility, it is easy to be removed after filtration.
Polyvinylpyrrolidone has good film forming and solubility, ‌ is miscible with water, ‌ can be dissolved in many alcohols, ‌ carboxylic acids, ‌ amines, ‌ halogenated hydrocarbons and other organic solvents. ‌PVP is synthesized by polymerization of the monomer N-vinylpyrrolidone (‌NVP) ‌ in the presence of an initiator. ‌ this compound has very low toxicity and very high physiological inertia, ‌ has no irritation to skin and eyes, ‌ is widely used in cosmetics. ‌PVP can form a non-occlusive film on the skin surface, ‌ plays the role of moisturizing and moisturizing, ‌ reduces greasy feeling, ‌ and has a good soft and smooth feeling. ‌ In addition, ‌PVP can also accelerate the penetration of facial mask ingredients, ‌ extend the retention time of ingredients. ‌ In personal care products, ‌PVP as a styling agent and film forming agent, ‌ has good film forming properties, ‌ can form a transparent film, ‌ has a good protective effect on hair, ‌ makes the hair fixed, ‌ lasting and keep bright, ‌ is not dusty. The excellent biocompatibility of ‌PVP makes it not irritating to skin, ‌ mucosa and eyes, ‌ and is not carcinogenic in itself, ‌ has good food safety, ‌ is mainly used as a clarifier and stabilizer for beer, ‌ juice, ‌ wine and other foods in food processing. ‌