Preparation method of PVB resin with high bulk density

Abstract

The invention relates to the technical field of preparation of PVB resin, especially to a preparation method of PVB resin with high bulk density. In order to improve production efficiency and reduce production cost and production difficulty, PVA resin is degraded, the addition sequence of n-butyraldehyde is adjusted, and process conditions such as synthesis temperature are optimized, so an emulsifier is prevented from being added, the n-butyraldehyde is ensured to be uniformly dispersed in a system, and the acetalation degree of the PVB resin is improved; an acetalation reaction and a chain extension reaction are simultaneously carried out by adding a small amount of a chain extender, so the viscosity of the PVB resin is improved; and the PVB resin prepared by using the method has high acetalation degree and high viscosity.

Description

technical field

[0001] The present invention relates to the preparation technical field of PVB resin, particularly a kind of preparation method of high bulk density PVB resin. Background technique

[0002] Polyvinyl Butyral Resin (Polyvinyl Butyral Resin, PVB) is a resin synthesized by acetal reaction of polyvinyl alcohol (PVA) and butyraldehyde under acidic conditions. It has high transparency, cold resistance, impact resistance and ultraviolet radiation resistance. Good adhesion to metal, glass, wood, ceramics, fiber products, etc. The existing synthetic technique of polyvinyl butyral (being called for short PVB) resin is divided into two kinds of homogeneous phase method and heterogeneous phase method. The homogeneous method usually uses polyvinyl acetate as the starting material, and the alcoholysis and acetalization reactions are carried out simultaneously, and then the finished product is obtained through steps such as precipitation, washing, and drying. The heterog...