直接酯化法合成PTT的研究

研究了用直接酯化法合成聚对苯二甲酸丙二醇酯(PTT)的工艺,考察了影响合成工艺的各种因素。结果表明,1,3-丙二醇的醛含量对PTT合成反应有较大影响;实验所选定的复合催化剂能起到较好的催化作用,相对催化剂钛酸四丁酯可使反应速度提高15%,并可提高产品色相;制备PTT切片最佳工艺条件为醇酸量比为1.4:1,缩聚反应温度为270~272℃;固相增黏得到的PTT切片主要物理性能和纺丝性能指标达到美国杜邦公司的同类产品水平。

Study on PTT synthesis with direct esterification method

The technology of polytrimethylene terephthalate(PTT) synthesis with direct esterification method was studied.The influentce factors on synthesis process were discussed.The results showed that the aldehyde content in PDO had a significant effect on the synthesis reaction of PTT.The selected compound catalyst had a better catalysis compared to traditional tetrabutyl titanate catalyst,the polycondensation reaction rate can be increased by 15%,the product hue was increased.The optimum process conditions of PTT chip synthesis are that the molar ratio of PDO to PTA is 1.4:1,and polycondensation temperature is 270 ~ 272 ℃.The main physical properties indexes and spinning properties indexes of PTT chip produced by solid state polycondensation can reached the level of similar products in American DuPont Company.