Nature of PVP poly vingt pyrrollidone (PVP) is a kind of non-ionic polymer compound. It is the most distinctive, best-studied and widely used fine chemical variety of N-vinyl- acyl-serving polymers. At present, it has developed into abundant ions and cations. Anion category, work weight grade. Pharmaceutical grade, food suture 3 specifications, the relative molecular shield amount from thousands to more than one million polymer, copolymer and polymer series products, and with its excellent and unique performance in widely used, PVP is divided into confining energy according to its average molecular weight size, usually expressed by the K value, different K values represent the corresponding The average molecular weight range of PVP. The K value is actually an eigenvalue related to the relative viscosity of PVP aqueous solution, and the viscosity is a physical quantity related to the molecular weight of polymers, so the average molecular weight of PVP can not…