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

摘要

The invention discloses a kind of half interpenetrating network structure type polyester/polyethylene aldehyde hot melt adhesive and its preparation process, mainly include the following steps: (1) by a certain amount of dimethyl terephthalate (DMT) and other dibasic esters, 1,Reactor is added in 4- butanediols and other dihydric alcohols, organotin catalysts, and ester exchange reaction is carried out under nitrogen protection, and reacting to the quantity of distillate of by-product monohydric alcohol is 95% or more of theoretical amount, and ester exchange reaction is completed; (2) after keeping the temperature a period of time, stabilizer, polycondensation catalyst is added, continues to increase reaction temperature, depressurizes polycondensation up to copolymer particle, then chilled, crushes, copolyester powder can be obtained; (3) PVAC polyvinylalcohol/glyoxal mixture is added in the product of step (2), stirring is uniformly mixed it under room temperature, and target product is made. The product can form half interpenetrating network structure at service temperatures, have the characteristics that peel strength is high, heat resistance is good.