| abstract |
(57) [Summary] [PROBLEMS] Even when a porous sheet-like support such as a non-woven fabric is used as a reinforcing material, a decrease in permeation flux is minimized, and a good balance between permeation flux and molecular weight cutoff is achieved. Provided is a method for manufacturing a porous membrane. SOLUTION: A solution containing a polymer having a film-forming property on one surface of a porous sheet-like support and a solvent is dissolved in the other surface of the sheet-like support, and coagulation is performed. A method for producing a separation membrane, in which a polymer in which a polymer that can be easily mixed with a liquid is coated is immersed in a coagulating liquid to cause phase separation of the polymer. According to the production method of the present invention, the balance between the permeation flux and the molecular weight cutoff is superior to that of a conventional porous membrane reinforced with a porous sheet-like support. According to the production method of the present invention, if the same molecular weight cutoff or rejection, A porous membrane exhibiting a higher permeation flux can be produced. |