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    • 1. 发明授权
    • Method of casting a porous membrane of polymeric material
    • 浇铸聚合物材料多孔膜的方法
    • US4898698A
    • 1990-02-06
    • US281021
    • 1988-12-07
    • Thomas A. TweedleOleh KutowyAndre Tremblay
    • Thomas A. TweedleOleh KutowyAndre Tremblay
    • B01D67/00B29C41/12B29C67/20
    • B29C67/202B01D67/0011B01D67/0013B01D67/0016B01D2325/20B29C41/12
    • A method of casting porous membranes of polymeric material is provided wherein the membrane has at least one of the following: a more homogeneous active skin layer for separation purposes with a lower molecular weight cut off, a more homogeneous active skin layer with a sharper molecular weight cut off curve, a relatively thinner active skin layer with a relatively greater flux for a given separation of a substance from a solution thereof, and relatively fewer imperfections through the active skin layer. The method comprises casting a layer of a casting solution on to a support, to provide a cast layer of the casting solution thereon with an exposed skin, then progressively submerging the cast layer in a gelation liquid at a relative velocity of at least 15 cm/second, whereby the exposed skin is gently scrubbed with gelation liquid to continuously remove outwardly diffusing solvent therefrom and dissipate exothermic heat, thus causing gelation of at least a stable, more homogeneous active skin layer, with build-up of a solvent boundary layer between the exposed surface of the layer and the gelation liquid minimized.
    • 提供了一种浇注聚合材料的多孔膜的方法,其中该膜具有以下至少一种:用于分离目的的更均匀的活性表层,较低分子量的切断,更均匀的分子量更高的活性表层 截断曲线,相对较薄的活性表层,具有相对较大的通量,用于给定的物质与其溶液的分离,以及相对较少的通过活性表层的缺陷。 该方法包括将一层浇铸溶液浇铸到载体上,以在其上提供具有暴露皮肤的浇铸溶液的浇铸层,然后以至少15cm / s的相对速度将流延层逐渐浸入凝胶液中, 第二,由此暴露的皮肤用凝胶液缓缓地洗涤,以从外部向外扩散溶剂并消散放热,从而引起至少一个稳定的,更均匀的活性皮肤层的凝胶化,同时在溶剂界面层之间形成 暴露的表面和凝胶液最小化。