非対称ポリイミド限外濾過膜の製膜条件の検討

概要

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The preparation of polyimide ultrafiltration membranes has been investigated. The asymmetric solvent-registant membranes were prepared from casting solutions composed of aromatic polyimide (Upjohns PI-2080) and solvent by the phase conversion process, and their separation performances were tested for aqueous polyethyleneglycol (PEG) solution by means of a bach type of ultrafiltration apparatus to evaluate the influences of the fabrication conditions. The parameters investigated were the composition of the casting solutions, casting thickness, casting temperature and evaporation time. The membrane made from the casting solution of 20wt% polyimide and N-methyl-2-pyloridone (NMP) with evaporation time of 15min. at 80°C, exhibits a water flux of 0.5m3/m2×day with a rejection of polyethyleneglycol (M. W.=14, 000) in excess of 95% at 3kg/cm2, for PEG 3, 000ppm feed solution. It was confirmed by immersion tests that the membranes were stable for many organic solvents such as alcohols, aliphatic and aromatic hydrocarbons
日本膜学会の論文