Synthetic method of polycaprolactone polyol

The invention provides a synthesis method of polycaprolactone polyol. The method comprises the following steps: mixing poly 6-hydroxycaproate with polyol, a first catalyst and a solvent, carrying outester exchange reaction at 220-300 DEG C for 1-20 hours, adding a second catalyst, carrying out molecular weight modulation at 250-300 DEG C under the absolute pressure of 0.0005-0.1 Mpa for 1-5 hours, and distilling out the solvent after the reaction is finished to obtain the polycaprolactone polyol. The preparation method has the beneficial effects that the cost is lower, the yield of the polycaprolactone polyol is increased, and the whole reaction is low in risk, environment-friendly and pollution-free. 本发明提供了一种聚己内酯多元醇的合成方法，聚6-羟基己酸酯首先与多元醇、第一催化剂、溶剂混合在220-300℃进行1-20h的酯交换反应，然后再加入第二催化剂在250-300℃，绝压0.0005-0.1Mpa进行1-5h分子量调变，反应结束后蒸馏出溶剂，最后得到聚己内酯多元醇本发明的有益效果是：成本更低，提高了聚己内酯多元醇的产量，而且整个反应危险性小，对环境友好，无污染。