磺酸-羧酸型水性聚氨酯的制备及性能研究

Study on preparation and performance of sulfonic/carboxylic waterborne polyurethane

摘要:

采用预聚体合成法，以二羟甲基丙酸(DMPA)和自制1,2-二羟基-3-丙磺酸钠(DHPA)为亲水扩连剂制备一系列含有磺酸基团的水性聚氨酯微乳液。利用FTIR对DHPA和PU的结构进行表征，证实了目标产物DHPA的生成，并作为亲水扩链剂引入PU链上。研究表明：随着DHPA含量增大，乳胶粒平均粒径逐渐减小，粒径分布宽度变窄；TEM照片显示，乳液分散 均匀，形貌规整，呈圆球状。乳液表观黏度随着剪切速率增加而下降，呈假塑性流体特征。

Abstract:

Waterborne polyurethane emulsions with sulfonic group were synthesized by a prepolymer process using dimethylol propionic acid (DMPA) and self-prepared sulfonic hydrophilic monomer (namely 1 2-dihydroxy-3-propanesulfonic acid salt DHPA). The structure of the films was confirmed by means of FTIR. The test results indicated that the DHPA has been synthesized and introduced into the chain of polyurethane. The results indicated that the average particles diameter of polyurethane emulsions became smaller and particles distribution width became narrower, with the increase of the weight of DHPA. TEM photos show that PU emulsions were well-dispersed with neat appearance. The viscosity of emulsions decreased, with the increase of shear rate, showing pseudo-plastic characteristics.