PVP (polyvinylpyrrolidone), as a completely synthetic water-soluble polymer compound, is a series of polymer fine chemical products obtained from monomer N-vinylpyrrolidone (NVP) through homopolymerization, copolymerization, crosslinking polymerization and other methods, with excellent solubility, physiological compatibility, complexability, film formation, bonding ability, water absorption and moisture retention properties. Can be used as auxiliaries, additives, auxiliary materials, etc., in medicine, textile, chemical, beverage, daily chemical and other fields have been applied. The main varieties and specifications of PVP can be divided into viscosity levels according to molecular weight K-15, K-30, K-60, K-90, etc., in general, the larger the K value, the larger the molecular weight, the larger the viscosity, the smaller the solubility, the higher the thermal stability, the easier to form crystals, suitable for different scenarios.PVP is widely used in medical, daily chemical, food industry, textile dyeing and finishing industry and other fields, the scale of production continues to expand, in recent…