Polyvinylpyrrolidone is abbreviated as PVP, which is a kind of non-ionic polymer compound. It is the most distinctive N-vinylamide polymer and the most extensively studied fine chemical. It has developed into three categories of non-ionic, cationic and anionic, three specifications of industrial grade, pharmaceutical grade, and food grade, and a series of homopolymers, copolymers and crosslinked polymers with relative molecular weights ranging from several thousand to over one million. , And has been widely used with its excellent and unique properties.
PVP is divided into four levels according to its average molecular weight. It is usually expressed by K value, and different K values represent the corresponding PVP average molecular weight range. The K value is actually a characteristic value related to the relative viscosity of the PVP aqueous solution, and the viscosity is a physical quantity related to the molecular weight of the polymer. Therefore, the K value can be used to characterize the average molecular weight of PVP. Generally, the greater the K value, the greater the viscosity and the stronger the adhesion.