Preparation and performance of polyurethane microporous films

doi:10.16085/j.issn.1000-6613.2016-1921

Abstract

Abstract: The waterproof and breathable polyurethane microporous films were prepared by dry film forming process using NH₄HCO₃ and the modified AC foaming agent individually as porogens.The effects of different kinds of porogens,the ratio of forming agent AC and activator ZnO,the dosage of NH₄HCO₃ and reaction conditions on the moisture permeability and mechanical properties of polyurethane film were investigated.Meanwhile,the pore size and distribution were characterized by polarized light microscope.The results show that the moisture permeability and porosity of polyurethane microporous film which has proper pore size and distribution have been significantly improved by adding porogens and the mechanical properties still meet the use requirement.The moisture permeability of polyurethane microporous films reached 929g/(m²·24h) and 1064g/(m²·24h) after treated with NH₄HCO₃ and modified AC foaming agent,respectively,which increased by 49.8% and 71.6% compared with the untreated polyurethane.In conclusion,NH₄HCO₃ and modified AC foaming agent have excellent pore forming performance and can be used to prepare polyurethane films with waterproof and breathable function.

Key words: porogen, ammonium acid carbonate (NH₄HCO₃), foaming agent, polyurethane microporous films, waterproof and breathable

摘要： 利用干法成膜工艺，分别以碳酸氢铵（NH₄HCO₃）、改性偶氮二甲酰胺（AC）发泡剂作为致孔剂制备具有防水透气性能的聚氨酯微孔膜。研究了不同种类致孔剂、致孔剂AC与活化剂ZnO比例、NH₄HCO₃用量以及反应条件对聚氨酯薄膜透湿性、孔隙率以及力学性能的影响，并使用金相显微镜对孔径大小及分布进行了表征。结果表明，加入致孔剂后的聚氨酯膜的透湿性、孔隙率等都有显著提高与改善，而且孔径大小适中，分布合理，力学性能仍旧满足使用要求。经NH₄HCO₃处理后的聚氨酯微孔膜的透湿性可达929g/（m²·24h）；改性AC发泡剂处理后的聚氨酯微孔膜的透湿性可达1064g/（m²·24h），比未处理的聚氨酯膜的透湿性分别提高了49.8%和71.6%。NH₄HCO₃和改性AC发泡剂具有优良的致孔性能，可以制备具有防水透气功能的聚氨酯微孔膜。

关键词: 致孔剂, 碳酸氢铵, 发泡剂, 聚氨酯微孔膜, 防水透气

CLC Number:

TS54
TS563

HE Beibei, XIE Yijun. Preparation and performance of polyurethane microporous films[J]. Chemical Industry and Engineering Progress, 2017, 36(07): 2562-2567.

贺贝贝, 解一军. 聚氨酯微孔膜的制备及其性能[J]. 化工进展, 2017, 36(07): 2562-2567.

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