钛酸四乙酯催化酯交换缩聚法合成聚醚型聚氨酯.pdfVIP

学兔兔 化 工 进 展 ·856· CHEMICAL INDUSTRY AND ENGINEERING PROGRESS 2016年第35卷第3期 钛酸四乙酯催化酯交换缩聚法合成聚醚型聚氨酯 刘冰灵，田恒水，崔喜 (华东理工大学化工学院，上海200237) 摘要：以钛酸四乙酯 (TET)为催化剂，聚四氢呋喃醚二醇 (PTMG)和1,6一六亚甲基二氨基甲酸甲酯 (HDC) 为原料，1,4一丁二醇为扩链剂，酯交换缩聚合成了聚醚型聚氨酯(PEPU)弹性体。以二丁基氧化锡 (DBTO)催 化合成的PEPU为参考，通过红外光谱 (FTIR)、凝胶色谱 (GPC)、热重分析 (TGA)、力学性能与光学性能测 试表征TET的催化效果。通过一系列单因素实验探讨了缩聚温度、缩聚时间、预聚温度、预聚时间对PEPU特 性黏度的影响规律。结果表明，TET比DBTO催化制得的PEPU热性能更好，力学性能更优。较佳的制备．Z-艺 为：预聚阶段温度为1IO~C，压力为0．070MPa，时间为20min；160~C下高真空缩聚110min。 关键词：钛酸四乙酯；催化剂；酯交换缩聚；合成；聚氨酯；黏度 中图分类号：TQ 323．8 文献标志码：A 文章编号：1000—6613(2016)03—0856—05 DoI：10．16085~．issn．1000—6613．2016．03．031 Tetraethyl titanate as a catalyst for the synthesis of polyether-polyurethanes by transurethane p0lyc0ndensatiOn LIUBingling，TIANHengshui，CUIXi (School ofChemicalEngineering，EastChinaUniversity ofScience andTechnology，Shanghai 200237，China) Abstract：Thermoplastic polyether polyurethanes(PEPUs)were prepared by a transurethane polycondensation method with poly(oxytetramethylene)glycol(PTMG)as a soft segment，dimethyl— hexane一1．6-dicarbamate(HDC)and 1,4-butanediol(BDO)as hard segments in the presence of tetraethyl titanate(TET)．FTIR，GPC，TGA and mechanical and optical property tests were used to characterize the catalytic performance of TET and compare with a standard catalyst of dibutyltin oxide (DBTO)．The effects of synthesis conditions such as polycondensation temperature，polycondensation time，prepolymerization