| 摘要 |
PURPOSE:To obtain a filter medium which can be used for reverse osmosis and ultrafiltration in any pH and temp. ranges by laminating a semipermeable organic high molecular compd. on the surface of a porous ceramics layer in >=1mum thickness. CONSTITUTION:A porous ceramics to be used as a supporting body can be selected optionally from among the porous ceramics which are used as the supporting body for the existing dynamic membrane. A viscous soln. of an organic high molecular compd., which can be formed into a semipermeable membrane, is prepared in advance, coated on the surface of the ceramics and dried. Otherwise a soluble substance is filled in the pores of the ceramics, leaving no space for the intrusion of the organic high molecular compd., and then a soln. of the high molecular compd. capable of forming a semipermeable membrane is coated thereon, and dried to form the semipermeable membrane.
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