非酸催化合成聚己二酸三甘醇酯

以钛酸四正丁酯为催化剂,己二酸和二缩三乙二醇为反应原料,合成了聚己二酸三甘醇酯。实验结果表明,最佳的反应条件为:醇酸摩尔比1.20∶1.0,催化剂用量为醇酸总质量的0.5%,常压下反应温度200℃,反应时间4h,真空度-0.090MPa时反应温度210℃,反应时间3h,封端剂与己二酸的摩尔比0.08∶1.0,酯化率可达99.85%。产品聚己二酸三甘醇酯的数均相对分子质量(Mn)为6827,重均相对分子质量(Mw)为6593,相对分子质量分布指数为1.04,具有窄分布性。产品的粘度为3.23Pa·s(25℃),具有较好的流动性。

Synthesis of Polytriethyleneglycol Adipate by Non-acid Catalysis

Poly triethyleneglycol adipate was prepared from adipate and triethyleneglycol, catalyzed by tetrabutyl titanate. The results of experiments showed the best reaction conditions of esterification were described as follows： molar ratio of triethyleneglycol to adipate 1.20：1.0, amount of catalyst 0.50% （based on the mass of acid and alcohol）, reaction temperature under normal atmosphere 200 ℃, reaction time 4 h, reaction temperature under vacuum （-0.090 MPa） 210 ℃, reaction time 3 h, molar ratio of chain-end reagent to adipate 0.08：1.0. Esterification yield is greater than 99.85%. Number-average molecular weight （Mn） of polytriethyleneglyeol adipate is 6827 and the weight-average molecular weight （Mw） of it is 6593, the polydispersity index is 1.04, so molecular weight distribution of the product is narrow. The viscosity of product is 3.23 Pa-s under 25℃, having good liquidity.