| 摘要 |
PURPOSE:To continuously and easily form the titled uniform and thin gas separation membrane by forming a substrate layer consisting of an air-permeable polymer on the surface of a water-impregnated supporting membrane, and then forming the film membrane of a gas separation membrane forming material. CONSTITUTION:A polysulfone porous membrane 4, etc., are laminated on the porous layer 3 of polyester nonwoven fabric, etc., by a wet membrane forming method. The water droplets 5 on the front and rear surfaces of the membrane 1 are removed, and then a soln. 11 consisting essentially of an air-permeable polymer is coated. The inside of the membrane 1 is filled with water, and the infiltration of the soln. 11 can be prevented. the material is instantaneously dried in an oven to vaporize and remove the water in the membrane 1, and the substrate layer 18 is formed. The substrate layer of double structure can also be formed. Then the org. solvent soln. 25 consisting essentially of the gas separation membrane forming material is coated. The material is instantaneously dried in an oven to form the gas separation layer 27 of a thin membrane. The layer of double structure can also be formed.
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