Asymmetric porous polytetrafluoroethylene membrane and process for preparing the same
    3.
    发明申请
    Asymmetric porous polytetrafluoroethylene membrane and process for preparing the same 有权
    不对称多孔聚四氟乙烯膜及其制备方法

    公开(公告)号:US20030089660A1

    公开(公告)日:2003-05-15

    申请号:US10281311

    申请日:2002-10-28

    IPC分类号: B01D071/36 B01D069/10

    摘要: The present invention relates to an asymmetric porous polytetrafluoroethylene membrane comprising a dense skin layer and a continuously foamed porous layer, (1) the dense skin layer having a surface roughness Ra of 20 to 165 nm; (2) the dense skin layer having a contact angle for water of 120 to 135null; (3) the porous layer having a maximum pore diameter of 0.03 to 1.0 nullm; and (4) the membrane having a total porosity of 20 to 70%. The asymmetric porous PTFE membrane has an ability to separate each liquid component from a liquid-liquid homogeneous mixture in addition to known properties such as water permeability resistance, gas permeability, sealing property and electric property, wherein change of these properties over time is small.

    摘要翻译: 本发明涉及一种包含致密表皮层和连续发泡多孔层的不对称多孔聚四氟乙烯膜,(1)表面粗糙度Ra为20〜165nm的致密表皮层; (2)水的接触角为120〜135°的致密表皮层; (3)多孔层的最大孔径为0.03〜1.0μm; 和(4)总孔隙率为20-70%的膜。 不对称多孔PTFE膜除具有透水性,透气性,密封性和电性等已知性质之外,还具有将液体成分与液 - 液均匀混合物分离的能力,其中随着时间的推移,这些特性的变化小。