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发明授权
CN106965499B 多孔复合薄膜及其制备方法 有权

多孔复合薄膜及其制备方法
摘要：
本发明涉及复合膜领域，尤其涉及一种多孔复合薄膜及其制备方法，多孔复合薄膜，包括基膜，所述基膜的外表面贴附有外层多孔薄膜，所述外层多孔薄膜上均匀分布有孔洞，所述孔洞的平均直径为1～10μm，多孔复合薄膜的制备方法，包括步骤1)按质量比，称取外层聚合物：醋酸丁酸纤维素为6.5:3.5～9:1，混合均匀后作为外层膜原料，将外层膜原料与基膜聚合物投入双层流延膜机，经双层流延膜机挤出、单向拉伸和冷却成型工序后得到由基膜与外层膜叠合的复合薄膜；2)将复合薄膜浸泡于丙酮溶液中，利用丙酮萃取外层膜中醋酸丁酸纤维素后，外层膜形成外层多孔薄膜，干燥后得到多孔复合薄膜。该多孔复合薄膜具有比表面积大的特点。
摘要（英）：

The invention relates to the composite film field, especially to a porous composite film and a preparation method thereof. The porous composite film includes a base membrane, an outer porous film is attached to the outer surface of the base membrane, and holes with an average diameter of 1-10micrometers are evenly distributed on the outer porous film. The preparation method of the porous composite film includes the steps of: 1) weighing an outer layer polymer and cellulose acetate butyrate according to a mass ratio of 6.5:3.5-9:1, mixing the substances evenly to obtain a mixture as an outer film raw material, putting the outer film raw material and a base membrane polymer into a double-layer casting film machine, carrying out extrusion by the double-layer casting film machine, uniaxial tension and cooling molding so as to obtain a composite film formed by superimposition of the base membrane and an outer film; and 2) soaking the composite film in an acetone solution, utilizing acetone to extract cellulose acetate butyrate in the outer film so as to let the outer film form the outer porous film, and then performing drying so as to obtain the porous composite film. The porous composite film has the characteristic of large specific surface area.

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