在合成聚酯—氨基甲酸酯嵌段共聚物过程中影响预聚伸链的主要因素的探讨

MAIN FACTORS EFFECTING THE PREPOLYMERIZATION AND CHAIN EXTENSION IN THE SYNTHESIS OF POLYESTER-URETHANE BLOCK COPOLYMER

本文通过二苯甲烷二异氰酸酯(MDI)的用量,溶剂DMF中的水分及其质量、聚酯二醇的酸值等试验,摸索到预聚仲链反应是制得氯纶的关键环节,也是影响纤维质量的重要因素,並掌握了其反应规律和影响因素。研究结果表明,预聚时间的延长、喷头拉伸倍数增加,可以使氨纶的模量提高、永久变形下降、回弹率提高。

The key link in the production chain of making polyurethane fiber is the piepolymerization and chain extention reaction which is the main factor influences fiber quality as well, the zesult of experiments also shows that by increasing the prepolymerization time and the ratio of spinneret draft the modulus and elasticity can be improved with reduced permanent deformation.