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A PROCEDURE FOR PREPARING AN ALCOHOL INSOLUBLE POLYAMIDE MEMBRANE, MICROPOROUS, HYDROPHILIC, SKINLESS AND MODIFIED SURFACE.
A PROCEDURE FOR PREPARING AN ALCOHOL INSOLUBLE POLYAMIDE MEMBRANE, MICROPOROUS, HYDROPHILIC, SKINLESS AND MODIFIED SURFACE.
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机译:一种制备醇不溶性聚酰胺膜,微孔,亲水,光滑和改性表面的方法。
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摘要
Surface modified, skinless, hydrophilic, microporous, polyamide membranes with controlled surface properties are prepared by the steps of preparing a casting solution comprised of (A) a casting resin system comprised of (a) an alcohol-insoluble polyamide resin, and (b) a water-soluble membrane surface modifying polymer having functional polar groups and a molecular weight of 10,000 or greater, and (B) a solvent system in which the casting resin system is soluble; inducing nucleation of the casting solution by controlled addition of a non-solvent for the casting resin system under controlled conditions to obtain a visible precipitate of casting resin system particles, thereby forming a casting composition; spreading the casting composition on a substrate to form a thin film; contacting and diluting the film of the casting composition with a liquid non-solvent system for the casting resin system, thereby precipitating the casting resin system from the casting composition in the form of a thin, skinless, hydrophilic, surface modified, microporous, polyamide membrane; and washing and drying the membrane. The membranes of this invention are characterized by having fine pore ratings, the surfaces properties thereof being substantially controlled by functional polar groups of a membrane surface modifying polymer and having the capability, through the functional polar groups of the modifying polymer, of reacting or interacting with particulates and/or nonparticulates in a fluid. Membranes of this invention are useful in removing metal species from aqueous streams and in immobilizing enzymes. Membranes of this invention also have enhanced filtration efficiency over a broad pH range with very fine contaminants, particularly very fine positively charged particles, such as asbestos.
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