摘要
以聚酯多元醇、异佛尔酮二异氰酸酯和二羟甲基丙酸为主要原料制备了固体质量分数为45%的水性聚氨酯,并将其在不同温度下干燥成膜。采用红外光谱、热失重等手段,研究了干燥温度对聚氨酯胶膜化学结构、热稳定性能和吸水性能的影响及干燥成膜过程中聚氨酯链上的羧酸三乙胺盐的变化。结果表明,在水性聚氨酯的成膜过程中,其主链上的羧酸三乙胺盐部分分解,干燥温度越高,分解程度越大,在胶膜中的残留量越少。羧酸三乙胺盐的含量影响胶膜的热稳定性能和吸水性能,羧酸三乙胺盐含量高,胶膜的热稳定性能差,吸水率高。
The waterborne polyurethane with solid content 45% was prepared by polyester polyol, isophorone diisocyanate, dimethylolpropionic acid. The polyurethane films were prepared and dried at different temperature. To investigate the change of carboxylic acid triethylamine in polyurethane, the chemical structure, thermostability and water absorption of the films were characterized and analyzed by fourier transform infrared spectrometry （FTIR）, thermal gravimetric analyzer and water absorption test. The results showed that carboxylic acid triethylamine was decomposed during waterborne polyurethane drying process. The lower amount of carboxylic acid triethylamine in the films was given with the drying temperature higher and decompose degree increasing. The amount of carboxylic acid triethylamine remained in the films of polyurethane affected the thermal stability and water resistance of the films. The greater amount of carboxylic acid triethylamine in the films, the worse thermal stability was given and water absorption of the films were higher.
出处
《聚氨酯工业》
2013年第3期6-9,共4页
Polyurethane Industry
基金
山西省归国留学人员重点科研项目(2012-08)
山西省重大科技专项(20111101059)
关键词
水性聚氨酯
羧酸三乙胺盐
成膜温度
热稳定性能
吸水性能
waterborne polyurethane
triethylamine acetate
film forming temperature
thermal stability
waterabsorption
