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    • 3. 发明授权
    • Composite semipermeable membrane
    • 复合半透膜
    • US4969998A
    • 1990-11-13
    • US603186
    • 1984-04-23
    • Robert L. Henn
    • Robert L. Henn
    • C08G65/32B01D69/12B01D71/52B01D71/66B32B27/28C08F2/48C08G75/02C08G75/04C08G75/12C08L71/02
    • B01D71/66B01D69/125B32B27/28C08G75/04
    • A composite semipermeable membrane is provided comprised of:(a) a flexible film of microporous hydrophobic material having a polar molecule vapor transmission rate in excess of 10,000 gms/m.sup.2 .multidot.24 hours, preferably 100,000 gms/m.sup.2 .multidot.24 hours, and an advancing polar liquid contact angle exceeding 90 degrees, and(b) a continuous, crosslinked amorphous hydrophilic layer penetrated to an extent into the face of the hydrophobic layer. The hydrophilic layer, when appropriately located in the structure of the microporous hydrophobic material provides a composite membrane having a polar vapor transmission rate of the complete ensemble comparable to or even exceeding that of the hydrophobic material alone, and simultaneously offering two mechanisms of separation; that imposed by the microporous layer and that imposed by the continuous, dense amporphous polymer layer, and as such is capable of numerous separation operations.
    • 提供复合半透膜,其包括:(a)微孔疏水材料的柔性膜,其极性分子蒸汽透过率超过10,000gms / m2×24小时,优选为100,000gms / m2×24小时,并且超前极性液体接触角超过 90度,和(b)连续交联的无定形亲水层穿透到疏水层的表面。 当亲水层适当地位于微孔疏水材料的结构中时,提供了一种复合膜,其具有与单独的疏水性材料相当甚至甚至超过疏水材料的极性蒸汽透过速率,同时提供两种分离机制; 由微孔层施加的和由连续致密的淀粉聚合物层施加的,因此能够进行许多分离操作。