| 摘要 |
PURPOSE:To obtain the titled dry filter membrane made of a hydrophobic resin, having excellent hydrophilicity, filtration performance, and mechanical strength, and which is used as a precision filter membrane or an ultrafilter membrane by impregnating the filter membrane made of a hydrophobic resin with a wetting agent, and then applying corona discharge treatment on the surface of the membrane. CONSTITUTION:For example, a dope obtained by dissolving 2-pyrolidone in polyether sulfone is spread over a polyester nonwoven fabric, and the fabric is dipped in water to obtain a filter membrane made of a hydrophobic resin such as an ultrafilter membrance. The membrane is then dipped in a wetting agent-contg. aq. soln. such as an aq. glycerin soln. and then dried. Corona discharge treatment is applied on the surface of the dried filter membrane. Consequently, the hydrophobic membrane material is made highly hydrophilic by the electric-discharge chemical reaction of the wetting agent and the membrane material. Moreover, since sufficient hydrophilicity can be obtained even with less amt. of the wetting agent added than before, the wetting agent can be rapidly removed from the inside of the membrane by washing with water.
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