水性聚氨酯处理对牛角瓜纤维性能的影响

Influence of Calotropis gigantea’s Performance Dealing with Waterborne Polyurethane

为了改善牛角瓜纤维单位纤度强力和弹性,用10%、20%和30%的水性聚氨酯溶液对前处理后的牛角瓜纤维进行整理,结果是纤维单位纤度强力和弹性模量变化显著,纤维断裂伸长率几乎不受影响,20%的水性聚氨酯处理后的牛角瓜纤维的单位纤度强力最高,平均值为3.39 cN/dtex。根据扫描电镜和接触角测试结果,前处理后的牛角瓜纤维表面连续的疏水层被破坏,亲水性提高,水性聚氨酯处理后的牛角瓜纤维表面覆盖有薄膜。

To improve Calotropis gigantea’s strength per size and elastic modulus, Calotropis gigantea was treated by 10%, 20% and 30% waterborne polyurethane. There were great changes in strength per unit and elastic modulus of Calotropis gigantea, but the breaking extension ratio was nearly the same when dealt with different concentrations of waterborne polyurethane. The average of strength per size disposed with 20% concentration was the highest and its average value was 3.39 cN/dtex. According to the testing results of SEM and contact angle, hydrophobic layer in the surface of Calotroipis gigantea was destroyed and its hydrophilic property was improved after pretreatment. There was a layer of membrane covering the surface of fiber when dealt with waterborne polyurethane.