Bipolar ion exchange sheet and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-10300478-B2
Application number	US-201515528287-A
Country	US
Kind code	B2
Filing date	Sep 16, 2015
Priority date	Nov 19, 2014
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

The present invention relates to a bipolar ion exchange sheet and a manufacturing method therefor, the bipolar ion exchange sheet comprising: a cation exchange film comprising a cation adsorption sheet and a cation exchange coating layer formed on one side of the cation adsorption sheet; and an anion exchange film comprising an anion adsorption sheet and an anion exchange coating layer formed on one side of the anion adsorption sheet, wherein the cation exchange film and the anion exchange film are bonded so that the cation exchange coating layer and the anion exchange coating layer face each other.

First claim

The invention claimed is:

1. A bipolar ion exchange sheet comprising:
a cation exchange membrane including a cation adsorption sheet and a cation exchange coating layer formed on one surface of the cation adsorption sheet; and
an anion exchange membrane including an anion adsorption sheet and an anion exchange coating layer formed on one surface of the anion adsorption sheet,
wherein the cation exchange membrane is bonded to the anion exchange membrane such that the cation exchange coating layer is in contact with the anion exchange coating layer,
wherein the cation exchange coating layer consists of a polymer having a cation exchange group, and
wherein the anion exchange coating layer consists of a polymer having an anion exchange group.

2. The bipolar ion exchange sheet of claim 1 , wherein each of the cation adsorption sheet and the anion adsorption sheet is an extruded film.

3. The bipolar ion exchange sheet of claim 1 , wherein the cation adsorption sheet includes a cation exchange resin powder and a binder.

4. The bipolar ion exchange sheet of claim 1 , wherein the anion adsorption sheet includes an anion exchange resin powder and a binder.

5. The bipolar ion exchange sheet of claim 1 , wherein each of the cation adsorption sheet and the anion adsorption sheet is a porous film.

6. The bipolar ion exchange sheet of claim 1 , wherein each of the cation adsorption sheet and the anion adsorption sheet has a thickness of 10 μm to 1,000 μm.

7. The bipolar ion exchange sheet of claim 1 , wherein the cation exchange coating layer and the anion exchange coating layer include metal hydroxide nanoparticles.

8. The bipolar ion exchange sheet of claim 1 , further comprising a water decomposition catalyst layer between the cation exchange coating layer and the anion exchange coating layer.

9. The bipolar ion exchange sheet of claim 8 , wherein the water decomposition catalyst layer includes metal hydroxide nanoparticles.

10. The bipolar ion exchange sheet of claim 9 , wherein the metal hydroxide nanoparticles are at least one selected from the group consisting of iron hydroxide and chromium hydroxide.

11. The bipolar ion exchange sheet of claim 1 , further comprising a symmetrical structure around a boundary between the cation exchange coating layer and the anion exchange coating layer.

12. A water treatment system comprising the bipolar ion exchange sheet according to claim 1 .

13. A method of manufacturing a bipolar ion exchange sheet, the method comprising:
producing a cation adsorption sheet and an anion adsorption sheet;
producing, respectively, a cation exchange membrane and an anion exchange membrane by coating a cation exchange coating solution on one surface of the cation adsorption sheet to form a cation exchange coating layer consisting of a polymer having a cation exchange group and by coating an anion exchange coating solution on one surface of the anion adsorption sheet to form an anion exchange coating layer consisting of a polymer having an anion exchange group; and
bonding the cation exchange membrane to the anion exchange membrane such that the cation exchange coating layer is in contact with the anion exchange coating layer.

14. The method of claim 13 , wherein each of the cation adsorption sheet and the anion adsorption sheet is an extruded film produced by melting and extruding a mixture of a binder resin and each of a cation exchange resin powder and an anion exchange resin powder.

15. The method of claim 13 , wherein each of the cation exchange coating solution and the anion exchange coating solution includes metal hydroxide nanoparticles.

16. The method of claim 13 , further comprising forming a water decomposition catalyst layer on one of the cation exchange membrane and the anion exchange membrane.

17. The method of claim 16 , wherein the water decomposition catalyst layer is formed by coating slurry, having metal hydroxide nanoparticles dispersed in a solvent, on one of the cation exchange membrane and the anion exchange membrane.

18. The method of claim 17 , wherein the metal hydroxide nanoparticles are at least one selected from the group consisting of iron hydroxide and chromium hydroxide.

Assignees

• Coway Co Ltd

Inventors

• Moon Sung-Min
• Lee Jun-Young
• Choi Sun-Beom
• Kang Sang-Hyeon
• Kang Kyung-Seok
• Son Won-Keun

Classifications

• B01J47/016

  Modification or after-treatment of ion-exchangers · CPC title

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J35/0013

  Operations & Transport · mapped topic

• B01D71/26

  Polyalkenes · CPC title

• B01J41/04

  Processes using organic exchangers · CPC title