Anion-exchange membrane and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-2026021451-A1
Application number	US-202318995673-A
Country	US
Kind code	A1
Filing date	May 25, 2023
Priority date	Jul 18, 2022
Publication date	Jan 22, 2026
Grant date	—

Abstract

Disclosed are an anion-exchange membrane and a manufacturing method therefor. The anion-exchange membrane may include: a porous polymer support composed of a membrane structure; and an anion-exchange polymer, wherein the anion-exchange polymer may be present on a surface and in pores of the porous polymer support, anion-exchange groups of the anion-exchange polymer may be uniformly distributed on the surface and in the pores of the porous polymer support, and the anion-exchange polymer may be a crosslinked product of a composition including a crosslinkable monomer represented by Formula 1:

wherein X − is as disclosed in the specification.

First claim

1 . An anion-exchange membrane comprising:
a porous polymer support composed of a membrane structure; and an anion-exchange polymer, wherein the anion-exchange polymer is present on a surface and in pores of the porous polymer support, wherein anion-exchange groups of the anion-exchange polymer are uniformly distributed on the surface and in the pores of the porous polymer support, and wherein the anion-exchange polymer is a crosslinked product of a composition comprising a crosslinkable monomer represented by Formula 1:

wherein, in the formula,
X − is F − , Cl − , Br − , or I − .

2 . The anion-exchange membrane of claim 1 ,
wherein the membrane structure has a structure in which pores are regularly arranged, or has a three-dimensional network structure.

3 . The anion-exchange membrane of claim 1 ,
wherein the membrane structure has a porosity of 30% to 80%.

4 . The anion-exchange membrane of claim 1 ,
wherein the membrane structure comprises at least one polymer selected from polyethylene, polypropylene, polyethylene terephthalate, polyvinyl alcohol, polybenzimidazole, polyarylene sulfide, polyether ether ketone, polyether sulfone, polysulfone, polystyrene, polyarylene ether sulfone, and polyether ketone.

5 . The anion-exchange membrane of claim 1 ,
wherein the porous polymer support has a thickness of 10 μm to 110 μm.

6 . The anion-exchange membrane of claim 1 ,
wherein the anion-exchange membrane has an average thickness of 10 μm to 200 μm.

7 . The anion-exchange membrane of claim 1 ,
wherein the anion-exchange membrane has an ion exchange capacity of 1.5 meq/g or more.

8 . The anion-exchange membrane of claim 1 ,
wherein the anion-exchange membrane has a sheet resistance of 10 Ω·cm 2 or less.

9 . The anion-exchange membrane of claim 1 ,
wherein the anion-exchange membrane is used for electrodialysis, bipolar membrane electrodialysis, electrodeionization, capacitive deionization, or water electrolysis.

10 . A manufacturing method for an anion-exchange membrane, the manufacturing method comprising:
providing a porous polymer support composed of a membrane structure; preparing a composition for forming an anion-exchange polymer comprising a crosslinkable monomer represented by Formula 1, a photoinitiator, and a solvent; impregnating the porous polymer support with the composition for forming an anion-exchange polymer, to thereby fill a surface and pores of the porous polymer support with the composition; pressing a polyester film onto at least one side of the porous polymer support filled with the composition to thereby prepare a laminate in which the polyester film and the porous polymer support are laminated; irradiating light onto the laminate and subjecting the composition to a crosslinking reaction to form, on the surface and in the pores of the porous polymer support, an anion-exchange polymer that is a crosslinked product of the composition; and separating the polyester film from the porous polymer support having the anion-exchange polymer formed on the surface and in the pores, to thereby prepare an anion-exchange membrane:

wherein in the formula,
X − is F − , Cl − , Br − , or I − .

11 . The manufacturing method of claim 10 ,
wherein a content of the crosslinkable monomer represented by Formula 1 is from 30 wt % to 70 wt % relative to 100 wt % of the composition for forming an anion-exchange polymer.

12 . The manufacturing method of claim 10 ,
wherein the membrane structure has a porosity of 30% to 80%.

13 . The manufacturing method of claim 10 ,
wherein the membrane structure comprises at least one polymer selected from polyethylene, polypropylene, polyethylene terephthalate, polyvinyl alcohol, polybenzimidazole, polyarylene sulfide, polyether ether ketone, polyether sulfone, polysulfone, polystyrene, polyarylene ether sulfone, and polyether ketone.

14 . The manufacturing method of claim 10 ,
wherein the porous polymer support has a thickness of 10 μm to 110 μm.

15 . The manufacturing method of claim 10 , further comprising,
before impregnating the porous polymer support with the composition for forming an anion-exchange polymer, immersing the porous polymer support in a surfactant solution and drying the porous polymer support to thereby prepare a porous polymer support having a hydrophilic surface.

16 . The manufacturing method of claim 10 ,
wherein the irradiation with light is performed using UVC as ultraviolet rays at a light intensity of 2,000 mJ/cm 2 to 10,000 mJ/cm 2 .

Assignees

• Toray Advanced Mat Korea Inc

Inventors

• Choo Jeong Joo
• Char Bong Jun
• Kim Ji Hwan

Classifications

• B01D2325/30

  Chemical resistance · CPC title

• B01D2325/16

  Membrane materials having positively charged functional groups · CPC title

• B01D2325/04

  Characteristic thickness · CPC title

• B01D2323/345

  UV-treatment · CPC title

• B01D2323/30

  Cross-linking · CPC title