MULTIPLE-UNIT SEMIPERMEABLE MEMBRANE AND MANUFACTURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a multiple-unit semipermeable membrane capable of withstanding long-term operation under a high pressure exceeding 5 MPa and having high pressure resistance. SOLUTION: The multiple-unit semipermeable membrane has a crosslinked polyamine superthin film formed by allowing an aqueous solution containing at least a kind of an amine component selected from the group of polyfunctional amins having at least 2 primary and/or secondary amino group to contact with a fine porous membrane obtained by applying a film forming original liquid prepared by dissolving a polymer in an organic solvent and adding an inorganic salt on a base material and next, allowing a water immiscible organic solvent solution containing an acid halide having at least 2 acid halide groups to contact with the fine porous membrane to perform an interfacial polycondensation on the fine porous membrane.