METHOD FOR MANUFACTURING FILTER HAVING CERAMIC POROUS FILM AS SEPARATING FILM

摘要

There is provided a method for manufacturing a filter utilizing a ceramic porous membrane as a separation film, comprising the steps of substituting the inside of fine-pores of the porous substrate (1) with a liquid, isolating the porous substrate face to be provided with a separation film to be airtight from the porous substrate face not provided with the separation film, continuously feeding a film deposition slurry (9) containing framework particles comprising a ceramic to allow the slurry to contact the porous substrate face to be provided with the separation film, applying a differential filtration pressure between the side face of the porous substrate to be provided with the separation film and the side face of the porous substrate not provided with the separation film, and depositing the slurry on the surface of the porous substrate. An organic polymer for endowing the deposition film layer with a filtration resistance is added to the slurry, thereby making it possible to form a porous membrane having a uniform film thickness and smooth film face as well as a sharp micro-pore size distribution.