Preparation method for polyester/polyvinyl glyoxal hot melt adhesive having a semi-interpenetrating network structure

摘要

A polyester/polyvinyl glyoxal hot melt adhesive having a semi-interpenetrating network structure and preparation technique therefor, mainly comprising the following steps: 1) placing a certain amount of dimethyl terephthalate and other dibsic esters, 1,4-butanediol and other diols, and an organic tin catalyst into a reactor, conducting an ester exchange reaction under the protection of nitrogen till the distillate quantity of the byproduct, monohydric alcohol, is above the theoretical quantity of 95%, and ending the ester exchange reaction; 2) maintaining the temperature for a period, adding a stabilizer and a polycondensation catalyst, continuing to raise the reaction temperature, performing polycondensation under a reduced pressure to obtain copolymer particles, and freezing and crushing to obtain copolymer powder; 3) adding a mixture of polyvinyl alcohol (PVA)/oxalic acid to the product of step 2), stirring under the normal temperature to make even, and producing the target product. The product can form a semi-interpenetrating network structure under an operation temperature.