Optimizing the Preparation Process for Polyamideamine-epichlorohydrin by Orthogonal Test

In this study, diethylenetriamine, epichlorohydrin and adipic acid were used as raw materials to prepare the PAE resin. The influence of the reaction factors on the properties of the PAE resin, including viscosity, cation degree and wet strength, was analyzed by orthogonal test, and the optimal PAE resin preparation process was defined: the first step, diethylenetriamine and adipic acid were mixed in the same molar volume, and the mixture was heated at 180°C for about 120 min to synthesis the polyamide-amine prepolymer; secondly, epichlorohydrin (1mol per one amideamine repeating unit) was added to the polyamideamine prepolymer, and the mixture was kept at 70°C, pH 7.0 for about 70 min to prepare PAE. Consequently, the PAE resin with high solid content and high wet strength was obtained.