为克服单一聚醚或聚酯型聚氨酯的缺点,以聚己二酸-1,4-丁二醇酯二醇(PBA)和聚四氢呋喃醚二醇(PTMG)为混合软段,以异佛尔酮二异氰酸酯(IPDI)和六亚甲基二异氰酸酯(HDI)为混合异氰酸酯,加入不同含量的扩链剂乙二胺(EDA),合成了一系列聚醚聚酯混合型水性聚氨酯(WPU)乳液.采用傅里叶红外光谱、粒径和Zeta电位测试、吸水性和表面接触角测试、力学性能以及热失重分析对乳液及WPU膜的结构与性能进行了表征,研究了EDA含量对WPU涂料涂膜性能的影响.结果表明:随着EDA含量的增加,聚氨酯分子氢键化能力增强,WPU乳液黏度和Zeta电位降低,乳液平均粒径增大且粒径分布范围变宽,WPU膜拉伸强度增强而断裂伸长率减小,WPU膜吸水性增加,耐水性下降,热稳定性得到一定程度的提高.
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