Decoloring process of hydroxyl vinyl chloride-vinyl acetate resin

The invention discloses a decoloring process in a preparation process of hydroxyl vinyl chloride-vinyl acetate resin, and belongs to the field of preparation and post-treatment of high-molecular copolymers. The method comprises the following steps of: dissolving a catalyst in small molecular alcohol, adding vinyl chloride-vinyl acetate copolymer resin, and performing heating to react at a constant temperature; adjusting the pH value of the reaction system to 3-6 by using a pH regulator, adding a decolorizing agent, then adding a decolorizing auxiliary agent, and performing stirring for reaction; after the reaction is finished, conducting washing, filtering and drying to obtain the hydroxyl modified vinyl chloride-vinyl acetate resin, and the whiteness of the resin can reach 79 or above. The resin can be used as an adhesive in the fields of ink and the like. 本发明公开了一种羟基氯醋树脂制备过程中的脱色工艺，属于高分子共聚物的制备及后处理领域。方法如下：将催化剂溶解于小分子醇中，加入氯乙烯-醋酸乙烯共聚树脂，加热恒温反应；使用pH调节剂调整反应体系pH值至3～6，加入脱色剂，再加入脱色助剂搅拌反应；反应结束后，经洗涤，过滤，干燥，得到羟基改性氯醋树脂，树脂白度可