摘要
以聚酯二元醇、甲苯二异氰酸酯、二羟甲基丙酸为主要原料,通过自乳化法合成了聚酯型水性聚氨酯。采用红外光谱仪、差示扫描量热仪和热重分析仪等对产物的结构与性能进行了表征。结果表明:随着R值(n(—NCO)/n(—OH))的增加,水性聚氨酯软硬段之间的微相分离程度加深,耐热性能下降;水性聚氨酯的热分解存在3个快速降解峰,分别位于190,275,360℃左右,且随着DMPA添加质量的增加,第一、二阶段的分解速率上升,第三阶段的分解速率下降;当R值为1.25左右,二羟甲基丙酸的添加质量分数为9%左右时,所合成的水性聚氨酯的综合性能最佳。
Inbuilt emulsified waterborne polyurethane was synthesized via the reaction of polyester glycol with toluene diisocyanate and dimethylol propionic acid. The structure and properties of the products were characterized by FTIR, DSC and TGA etc. The results show that with the R（n（--NCO）/n（--OH） value increasing, the level of microphase separation increased, but the thermal resistance decreased. Three degradation stages were found in polyurethane dispersions, 190℃, 275 ℃, 360 ℃, respectively. The first and second rate of weight loss stages increased as the DMPA content increased, while the third rate of weight loss stage decreased. The comprehensive performance of WPU was the best when the value of R was 1.25 and DMPA content was at about 9 %.
出处
《湖南工业大学学报》
2013年第2期11-15,共5页
Journal of Hunan University of Technology
基金
湖南省研究生科研创新基金资助项目(CX2012B402)
湖南工业大学研究生创新基金资助项目(CX1206)
关键词
水性聚氨酯
表征
热分析
waterborne polyurethane
characterization
TGA
