Synthesis and characterization of polyvinyl butyral

Polyvinyl butyral(PVB) has been widely used in many areas of ink,porcelain, tip-ping paper coatings, safety glass, etc., and it has a vast domestic and overseas market. Based on the feeding tests focusing on the sequence of adding acid, this study found that it is a better way to add acid in advance compared with adding acid later. Furthermore, through determining the butyral content and viscosity of PVB adhesive, this study discovered the optimum conditions for preparation of PVB adhesive: m(PVA): m(butyraldehyde) = 10:7, the p H value of reaction system is 3.0, and dropping butyraldehyde slowly. On the premise of keeping above conditions, the viscosity and butyral content of PVB synthesized with PVA with polymerization degree of 2099 are much higher than that of PVB synthesized with other polymerization degrees of PVA.