PTT与阳离子染料可染PTT的合成工艺

Synthesis of PTT and Cationic Dyeable PTT

研究了聚对苯二甲酸丙二醇酯(PTT)、阳离子染料可染PTT的合成工艺条件中各因素对酯化及缩聚反应的影响,包括单体物质的量比、催化剂浓度、反应时间和温度、抗氧剂种类等.结果表明:酯化率随1,3-丙二醇(PDO)与对苯二甲酸(PTA)比例的提高而提高,随催化剂钛酸四丁酯加入量的增大而提高,当w(PDO)∶w(PTA)=1.6,钛酸四丁酯与PTA物质的量比为2×10-4时,酯化率较高,反应容易控制;钛酸四丁酯同时可作为缩聚反应的催化剂;缩聚反应时间随温度的升高而缩短;温度过高,PTT易降解,以反应温度为265℃时较为适宜;间苯二甲酸丙二醇酯-5-磺酸钠(SIPP)的加入使PTT熔体的流动性变差,在相同搅拌功率时所得PTT的特性黏数随SIPP添加量的增加而降低,但PEG的加入可改善PTT熔体的流动性能;添加适量的抗氧剂Irganox1010可抑制PTT的热氧化降解.

In this paper, synthetic process of PTT and cationic dyeable PTT was studied, including molar ratio, catalyst concentration, reaction time and temperature, types of antioxidants in the esterification reaction and the condensation reaction. The results showed that the esterification rate increased with the increase of molar ratio of 1,3-PDO to PTA and the usage of tetrabutyltitanate concentration. When the molar ratio was 1.6, the esterification rate was higher and the reaction was easy to control. Tetrabutyl titanate also could be used as polymerization catalyst. Polycondensation reaction time decreased with the increase of temperature, but if the temperature was too high, PTT would be degradable. The appropriate reaction temperature was 265℃. The thermo-oxidative degradation would occur above the melting temperature of PTT, which could be controlled by addition of antioxidants.