Non-porous water-preventing moisture-permeating membrane and preparation method thereof

Abstract

The invention provides a non-porous water-preventing moisture-permeating membrane and a preparation method thereof. The preparation method comprises the following steps of a) dissolving raw materialsto obtain a cellulose solution; b) coating a membrane with the cellulose solution to obtain the wet membrane; and c) solidifying and regenerating the wet membrane in a coagulating bath to obtain the non-porous water-preventing moisture-permeating membrane. The raw materials comprise the following components of, in parts by mass, 60.00-100.00 parts of cellulose materials, 200.00-600.00 parts of ionic liquids, 0.00-25.00 parts of superfine powder and 0.00-15.00 parts of auxiliaries. According to the method, the cellulose macromolecule materials are combined with the ionic liquids, and the moisture-permeating membrane is prepared by an ionic liquid method; and cellulose is dissolved, regenerated, doped and modified, so that the obtained non-porous water-preventing moisture-permeating membraneis high in moisture permeability, and meanwhile, the membrane is high in breaking strength and strong in hydrostatic pressure resistance. 本发明提供了一种无孔型防水透湿膜及其制备方法。本发明提供的制备方法包括以下步骤：a)将原料溶解，得到纤维素溶液；b)将所述纤维素溶液涂膜，得到湿膜；c)将所述湿膜在凝固浴中进行凝固再生处理，得到无孔型防水透湿膜；所述原料包括以下质量份的组分：纤维素质材料60.00～100.00份；离子液200.00～600.00份；超细粉体0.00～25.00份；助剂0.00～15.00份。本发明采用纤维素大分子材料与离子液体结合，通过离子液体法制备透湿膜，通过纤维素的溶解再生和掺杂改性，能够使所得无孔型防水透湿膜具有高透湿量，同时还具有高断裂强度和较强的耐静水压。