Preparation method of epoxy chain extender

The invention provides a preparation method of an epoxy chain extender, which comprises the following steps: in the presence of a chloroplatinic acid catalyst, carrying out hydrosilylation reaction on allyl glycidyl ether and hydrogen-containing silicone oil to obtain a reaction product; and adding a complexing agent into the reaction product, carrying out complexing treatment at the temperature of 90-130 DEG C, and filtering to obtain the epoxy chain extender. The epoxy chain extender prepared by the preparation method provided by the invention has the advantages of less Pt catalyst and gel and high reaction activity. 本发明提供了环氧扩链剂的制备方法，其中，所述制备方法包括以下步骤：在氯铂酸催化剂存在下，使烯丙基缩水甘油醚与含氢硅油进行硅氢加成反应，制得反应产物；以及向反应产物中加入络合剂，在90～130℃的温度下进行络合处理，经过滤得到环氧扩链剂。本发明制备方法制备的环氧扩链剂中Pt催化剂和凝胶物少，反应活性高。