聚酯聚醚混合二元醇对水性聚氨酯性能的影响

Effect of Polyester/Polyether Mixed Diol on the Properties of Waterborne Polyurethane

以异佛尔酮二异氰酸酯(IPDI)和异佛尔酮二胺(IPDA)为硬段,分别以聚四氢呋喃二醇(PTMEG2000)、聚己二酸新戊二醇酯二醇(PNA2000)及其混合物为软段,制备了系列水性聚氨酯(WPU)乳液。通过ATR-FTIR对聚氨酯结构进行了表征分析,采用拉伸测试、热失重分析、动态力学分析及耐水性测试等手段对WPU胶膜性能进行了研究,探讨了不同软段结构对WPU胶膜性能的影响。结果表明:聚酯聚醚混合型水性聚氨酯的力学性能优于单一软段水性聚氨酯,其中PTMEG与PNA质量比为2∶1时力学性能最好;PTMEG型WPU胶膜的初始分解温度高于PNA型WPU胶膜,失重50%时分解温度相反;PTMEG型WPU胶膜的耐水性好于PNA型WPU胶膜。

A series of waterborne polyurethane(WPU)emulsions were prepared using isophorone diisocyanate(IPDI)and isophorone diamine(IPDA)as hard segments,polyoxytetramethylene glycol(PTMEG),polyneopentylene adipate glycol(PNA)and their mixtures as soft segments respectively.The structure of WPU was characterized by ATR-FTIR,the mechanical properties,heat resistance and water resistance of the films were tested by TG,DMA and tensile test,and the effect of different soft segments structure on the performance of WPU films was discussed.The results showed that the mechanical properties of polyester polyether mixed WPU were better than that of single soft segment WPU,and the mechanical properties were the best when PTMEG and PNA mass ratio was 2∶1.The PTMEG-based WPU possessed higher initial decomposition temperature and better water resistance than PNA-based WPU,however decomposition temperature was opposite when weight loss of WPU film was 50%.