Low-temperature cationic dyeable polyester composition as well as preparation method and application thereof

The invention discloses a low-temperature cationic dyeable polyester composition and a preparation method thereof. The cationic dyeable polyester composition is mainly composed of an aromatic dicarboxylic acid unit, an aliphatic dibasic acid or an esterified derivative thereof and an ethylene glycol unit. An esterification liquid obtained by reacting a sulfonate compound and ethylene glycol, aliphatic dibasic acid or an esterification derivative thereof and an alkali metal compound are added at any stage before the polymerization reaction is finished, and the esterification reaction rate of the esterification liquid is 95% or above. The polyester composition has the advantages of low insoluble compound content, low-temperature dyeing, few foreign matters in polyester, good spinnability, less filter pressure rise in the spinning process, long filter screen replacement period and low cost. 本申请公开了一种低温阳离子可染聚酯组合物及其制备方法。所述阳离子可染聚酯组合物主要由芳香族二元羧酸单元以及脂肪族二元酸或其酯化衍生物和乙二醇单元构成。在聚合反应结束前的任意阶段添加磺酸盐化合物和乙二醇反应得到的酯化液、脂肪族二元酸或其酯化衍生物以