| 摘要 |
PURPOSE:To obtain the titled composite semipermeable membrane having high desalting property and water permeation velocity and oxidation resistance even in a reduced-pressure operation by coating an extremely thin membrane consisting essentially of cross-linked piperazinepolyamide and the constituent shown by a specified formula. CONSTITUTION:For example, an aq. soln. contg. piperazine, 1,3-bis(4-piperidyl)- propane, dodecyl sodium sulfate, and trisodium phosphate is coated on a fiber- reinforced supporting membrane, and air-dried. Then the soln. of a mixture of isophthalic acid chloride and trimesic acid chloride in trichlorotrifluoroethane is coated, heat-treated, and subjected to interfacial polycondensation. The composite semipermeable membrane coated with the extremely thin membrane consisting essentially of cross-linked piperazinepolyamide and contg. the constituent shown by the formula is obtained in this way. |
