Composite semipermeable membrane and method for producing composite semipermeable membrane
AssigneeToray Industries, Inc.
InventorsHiroaki TANAKA, Hiroki MINEHARA, Koji NAKATSUJI, Masahiro KIMURA
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Abstract
This composite semipermeable membrane is provided with: a porous supporting membrane that comprises a base and a porous supporting layer; and a separating function layer that is provided on the porous supporting layer. With respect to this composite semipermeable membrane, the standard deviation of pore radius of the separating function layer as determined by positron annihilation lifetime measurement is 0.025 nm or less.
Claims10
A composite semipermeable membrane, comprising:
- a porous supporting membrane including a substrate and a porous support layer;
- and
- a separation functional layer disposed on the porous support layer,
- wherein a standard deviation of a pore radius of the separation functional layer measured by a positron annihilation lifetime measurement is 0.025 nm or less.
A method for producing a composite semipermeable membrane, the composite semipermeable membrane comprising a porous supporting membrane including a substrate and a porous support layer, and a separation functional layer disposed on the porous support layer, the method comprising a step of:
- forming the separation functional layer on the porous support layer,
- wherein the step includes substeps of:
- bringing a polyfunctional amine solution into contact with a polyfunctional acid halide solution to form a polyamide layer on the porous support layer through an interfacial polycondensation reaction;
- and
- adding a compound having an SP value of 7 to 15 (cal/cm3)1/2 to a reaction field of the interfacial polycondensation.
Dependencies are inferred from the claim text.