Vinyl chloride suspension polymerization dispersing agent with defoaming function as well as preparation method and application thereof

The invention belongs to the field of polymer products, and particularly relates to a vinyl chloride suspension polymerization dispersant with a defoaming function and a preparation method and application thereof, and the preparation method comprises the following steps: a) preparing a modified polyvinyl acetate copolymer; the partially alcoholyzed polyvinyl alcohol with the defoaming function is a white polymer in appearance, does not turn yellow like traditional polyvinyl alcohol at a high temperature, is used as a main dispersing agent, has excellent performance in the aspect of particle size control, is capable of inhibiting foam and defoaming, and has iteration significance on a vinyl chloride suspension polymerization dispersing agent. 本发明属于高分子制品领域，具体涉及一种具消泡功能氯乙烯悬浮聚合分散剂及其制备方法和应用，制备方法包括下述步骤：a）制备改性的聚乙酸乙烯酯共聚物；b）醇解；c）干燥。本申请的具消泡功能的部分醇解聚乙烯醇，外观为白色聚合物，不会像传统聚乙烯醇高温下会变黄；其作为主分散剂，除了在控制粒径方面表现优秀，并且抑泡、消泡，对氯乙烯悬浮聚合分散剂具有迭代意义。