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化工学报  2014 

水性聚氨酯的结晶动力学参数及其在鞋用胶黏剂的应用

DOI: 10.3969/j.issn.0438-1157.2014.04.047, PP. 1503-1508

Keywords: 聚合物,水性聚氨酯,结晶,动力学,胶黏剂,初黏强度,开放时间

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Abstract:

以聚己二酸1,4-丁二醇酯(PBA)、六亚甲基二异氰酸酯(HDI)和异佛尔酮二异氰酸酯(IPDI)为主要原料,制备了不同软段分子量和不同硬段含量的水性聚氨酯(WPU)乳液。采用DSC技术表征了WPU胶膜在非等温和等温条件下的结晶行为,并以莫志深方程和Avrami方程为模型,对WPU胶膜的结晶行为进行了研究。WPU胶膜的非等温结晶动力学分析结果表明,随着WPU相对结晶度的增加,非等温结晶动力学参数F(T)增大,说明适当提高活化温度可提高WPU胶黏剂的结晶速率和初黏强度;WPU胶膜的等温动力学分析结果表明,不同软段分子量和不同硬段含量的WPU胶膜的等温结晶动力学参数t1/2与相应WPU胶黏剂的开放时间存在对应关系,即t1/2较大者,相应WPU胶黏剂的开放时间较长。

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