The difference is solubility and miscibility. Polyvinylpyrrolidone is a polymer of vinylpyrrolidone with different molecular weights. It is easily soluble in water and does not undergo electrolysis. Its aqueous solution is miscible with cellulose series solutions. It can also be mixed with nonionic, anionic or cationic components such as salicylic acid. PVPK series products can be settled by adding a large amount of salt, and K90 is easier to settle than K17. The solubility of PVP in different organic solvents varies greatly.
PVPK series can be dissolved in these solvents to obtain a solution containing at least 10% PVP. Storage stability When the pH value of the aqueous solution is higher than 6, it will increase when stored at a higher temperature. Acidified solution (concentration less than 30%) has a tendency to agglomerate during storage, which can be prevented by adding stabilizers. It is not recommended to use OH or NH2 stabilizers.
Application: Suspending agent, dispersing agent, emulsifier Adding PVPK to water-soluble suspending agent, dispersing agent, an emulsifier can increase stability. PVP can form a thin layer on the surface of the colloid particles, which can avoid its condensation. Plastic production In the production of solid plastic polymers, PVPK is added as a protective colloid and polymerization stabilizer. Adhesives PVPK 90 and K 85 are thickeners and thickeners for sodium stearate adhesives. Different PVPK can be mixed to get suitable viscosity. In the adhesive dispersion, PVP K is also used as a protective colloid and thickener. PVP K is also used as a wettable glue for sealing stamps and envelopes because PVP is soluble in water.