间苯二甲酸-5-磺酸钠合成CDP的酯化反应研究

Esterification reaction of 5-sulfoisophthalic acid sodium salt into CDP

采用改性剂间苯二甲酸-5-磺酸钠(SIPA)、对苯二甲酸(PTA)、乙二醇(EG)直接酯化反应合成阳离子染料可染聚酯(CDP);讨论了SIPA的添加量对酯化反应时间影响,同时对其动力学进行研究,确定了最佳反应条件。结果表明:随着SIPA的含量增加,酯化反应时间缩短,反应活化能降低;较佳的酯化反应条件为(SIPA+PTA)∶EG摩尔比1.0∶1.5,SIPA占(SIPA+PTA)质量分数1.5%;添加SIPA合成CDP的酯化反应动力学按零级反应处理。

A modifier of 5-sulfoisophthalic acid sodium salt （SIPA） was directly esterified with purified terephthalic acid （PTA） and ethylene glycol （EG） to synthesize cationic dyeable polyester （CDP）. The effect of SIPA addition on the esterifica- tion time was discussed. The kinetics of SIPA was studied to optimize the reaction conditions. The results showed that the esterifi- cation time was shortened and the reaction activation energy was decreased with the addition of SIPA; the esterification conditions were optimized as followed： the mole ratio of （SIPA ＋PTA） and EG 1.0 ： 1.5, 1.5% SIPA based on （SIPA ＋PTA） by mass fraction; the kinetics of SIPA esterification into CDP was regarded as zero-order reaction.