Polysulfone semipermeable membrane and method of manufacturing the same
First Claim
1. A polysulfone semipermeable membrane comprising a semipermeable membrane of polysulfone resin formed of a continuous structure of a homogeneous skin layer having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of said homogeneous skin layer and is thicker than said homogeneous skin layer, wherein said porous layer is formed of a structure having voids with an average pore diameter less than 3 μ
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Abstract
The semipermeable membrane of polysulfone resin is formed of a continuous structure of a homogeneous skin layer part having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of the homogeneous skin layer and is thicker than the homogeneous skin layer, and the porous layer is formed of a structure having voids having an average pore diameter less than 3 μm. Therefore, a gas separation membrane that has high permeation flux and requires practically satisfactory cost can be provided. Diethylene glycol dimethyl ether was added to polysulfone for dissolution, and the resultant solution was defoamed for preparation. The solution was cast on a support layer of polyester non-woven fabric using an applicator, dipped in water as a solidifying liquid, and dried. As a result, a semipermeable membrane comprising a homogeneous skin layer part and a porous layer is obtained. A crosslinking silicone resin solution may be applied to the surface of the membrane to form a protective film.
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Citations
7 Claims
- 1. A polysulfone semipermeable membrane comprising a semipermeable membrane of polysulfone resin formed of a continuous structure of a homogeneous skin layer having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of said homogeneous skin layer and is thicker than said homogeneous skin layer, wherein said porous layer is formed of a structure having voids with an average pore diameter less than 3 μ
Specification