Preparation methods of solvent-free self-emulsifying water-soluble chlorinated polypropylene

A preparation method of a solvent-free self-emulsifying water-soluble chlorinated polypropylene, comprising the following steps:

• (1) mixing chlorinated polypropylene, a first portion of an acrylic acid/ester mixture, and a cosolvent to obtain a resulting mixture, raising temperature to 80±5° C., and gradually dissolving the resulting mixture into a homogeneous solution under stirring conditions;
• (2) gradually adding an initiator and a second portion of the acrylic acid/ester mixture to the homogeneous solution of step (1) at 60-90° C. to obtain a first mixed solution, and after an addition is completed, stirring the first mixed solution for a first reaction at 70-140° C. for 0.5-2 hours to obtain a first reaction solution;
• (3) adding an isocyanate-terminated carboxyl hyperbranched polyester adduct to the first reaction solution of step (2) at 30-80° C. to obtain a second mixed solution, and stirring the second mixed solution for a second reaction for 0.5-3 hours at 30-80° C. to obtain a second reaction solution;
• (4) adding an amine neutralizer into the second reaction solution under a condition of 50-80° C. to neutralize the second reaction solution to a pH of 6.8-7.5, and then gradually adding deionized water, and emulsifying for 0.5-3 hours under the condition of 50-80° C. and 300-600 rpm, to obtain the solvent-free self-emulsifying water-soluble chlorinated polypropylene with a solid content of 30-45%;
• wherein
• the acrylic acid/ester mixture is a mixture of methyl methacrylate, octyl acrylate, and hydroxyalkyl acrylate;
• the isocyanate-terminated carboxyl hyperbranched polyester adduct is a product of an addition reaction between equimolar terminated carboxyl hyperbranched polyester and diisocyanate;
• a mass ratio of the chlorinated polypropylene, the acrylic acid/ester mixture, the isocyanate-terminated carboxyl hyperbranched polyester adduct, and the cosolvent is 100:(80-350):(0.5-5.0):(1.0-10.0).