聚氨酯微孔膜的制备及其性能

发布时间：2018-05-08 02:16

本文选题：致孔剂 + 碳酸氢铵　；参考：《化工进展》2017年07期

【摘要】：利用干法成膜工艺,分别以碳酸氢铵(NH_4HCO_3)、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Zn O比例、NH_4HCO_3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NH_4HCO_3处理后的聚氨酯微孔膜的透湿性可达929g/(m~2·24h);改性AC发泡剂处理后的聚氨酯微孔膜的透湿性可达1064g/(m~2·24h),比未处理的聚氨酯膜的透湿性分别提高了49.8%和71.6%。NH_4HCO_3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。
[Abstract]:Polyurethane microporous membranes with waterproof and breathable properties were prepared by dry film forming process with ammonium bicarbonate NH _ 4HCO _ 3 and modified azo-diformamide acid) as pore-forming agent. The effects of different kinds of pore-forming agents, pore-causing agent AC and Zn-O ratio of pore-causing agent and Zn-O ratio on the moisture permeability, porosity and mechanical properties of polyurethane films were studied. The pore size and distribution of polyurethane films were characterized by metallographic microscope. The results showed that the moisture permeability and porosity of the polyurethane membrane were improved and the pore size was moderate and the distribution was reasonable. The mechanical properties still met the requirements of application. The moisture permeability of polyurethane microporous membrane treated with NH_4HCO_3 was up to 929g/(m~2 24 h, and that of modified AC foaming agent was up to 1064g/(m~2 24 h, which was 49.8% higher than that of untreated polyurethane membrane and 71.6%.NH_4HCO_3 and modified AC foaming agent, respectively. It has excellent pore-forming performance, Polyurethane microporous membrane with waterproof and breathable function can be prepared.
【作者单位】：河北工业大学化工学院;
【分类号】：TB383.2;TQ323.8

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