Composite semipermeable membrane and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11590458-B2
Application number	US-201916965467-A
Country	US
Kind code	B2
Filing date	Jan 23, 2019
Priority date	Jan 30, 2018
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

A method for manufacturing a composite semipermeable membrane is capable of forming, on a surface of a porous support in a highly reproducible manner, a separation layer that is extremely thin and that exhibits superior separability. It provides, on a surface of a porous support, a composite semipermeable membrane that has an organic/inorganic hybrid separation layer that is extremely thin and that exhibits superior separability. A method for manufacturing a composite semipermeable membrane includes forming, on a surface of a porous support, a separation layer containing a cross-linked condensate having a siloxane bond by bringing an organic solution that contains an organic silicon compound containing three or more reactive functional groups, each of which is at least one type selected from a hydrolyzable group and a hydroxyl group, into contact with water or an aqueous solution on the porous support, and by performing interfacial polycondensation of the organic silicon compound.

First claim

The invention claimed is:

1. A method for manufacturing a composite semipermeable membrane, comprising bringing an organic solution containing an organosilicon compound having three or more reactive functional groups of at least one selected from a hydrolyzable group and a hydroxyl group into contact with water or an aqueous solution on a porous support to carry out interfacial polycondensation of the organosilicon compound and form a polysiloxane separation layer containing a cross-linked condensate having a siloxane bond on a surface of the porous support.

2. The method for manufacturing a composite semipermeable membrane according to claim 1 , wherein the hydrolyzable group is halogen, an alkoxy group, an alkenyloxy group, an acyloxy group, an aryloxy group, a ketoxime group, an aminohydroxy group, an amino group, an alkylamino group, a cyano group, and an isocyanate group.

3. The method for manufacturing a composite semipermeable membrane according to claim 1 , wherein the organosilicon compound contains a compound represented by the following general formula (1):

wherein R 1 to R 6 are each independently hydrogen, a hydroxyl group, halogen, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkenyloxy group having 2 to 12 carbon atoms, an acyloxy group having 2 to 12 carbon atoms, an aryloxy group, a ketoxime group, an amino group, an alkylamino group, a cyano group, an aminohydroxy group, or an isocyanate group, and X is a saturated hydrocarbon group having 1 to 12 carbon atoms, an unsaturated hydrocarbon group having 2 to 12 carbon atoms, a functional group having a heterocycle, or —R 7 —NR 8 —R 9 —(wherein R 7 and R 9 are each independently a saturated hydrocarbon group having 1 to 12 carbon atoms or an unsaturated hydrocarbon group having 2 to 12 carbon atoms, and R 8 is hydrogen, an alkyl group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms).

4. The method for manufacturing a composite semipermeable membrane according to claim 1 , wherein the aqueous solution contains a surfactant.

Assignees

• Nitto Denko Corp
• Univ Hiroshima

Inventors

• Kawashima Toshiyuki
• Inoue Shinichi
• Hirose Masahiko
• Ohshita Joji
• Tsuru Toshinori
• Yamamoto Kazuki

Classifications

• B01D69/125 Primary

  In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction · CPC title

• B01D69/1071

  Woven, non-woven or net mesh · CPC title

• B01D71/70

  Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only · CPC title

• C08J7/04

  Coating · CPC title

• C08J2381/06

  Polysulfones; Polyethersulfones · CPC title