Bipolar ion exchange membrane using heterogeneous ion exchange membrane as support and production method therefor

Patent metadata

Field	Value
Publication number	US-2021106948-A1
Application number	US-201816498828-A
Country	US
Kind code	A1
Filing date	Mar 26, 2018
Priority date	Mar 28, 2017
Publication date	Apr 15, 2021
Grant date	—

Abstract

The present invention relates to a bipolar ion exchange membrane and a production method therefor, and provides a bipolar ion exchange membrane comprising a first polar heterogeneous ion exchange membrane and a second polar homogeneous ion exchange membrane stacked on each other, wherein the first polar heterogeneous ion exchange membrane is formed of an ion exchange resin powder and a binder resin that contain a first polar ion exchange group, the second polar homogeneous ion exchange membrane is formed of a matrix resin containing a second polar ion exchange group, and an interface between the first polar heterogeneous ion exchange membrane and the second polar homogeneous ion exchange membrane is a heterogeneous interface.

First claim

1 . A bipolar ion-exchange membrane, comprising:
a heterogeneous ion-exchange membrane having a first polarity and formed of a binder resin and ion-exchange resin powder comprising an ion-exchange group having the first polarity, and a homogeneous ion-exchange membrane having a second polarity and formed of a matrix resin comprising an ion-exchange group having the second polarity, the heterogeneous ion-exchange membrane and the homogeneous ion-exchange membrane being stacked, wherein an interface at which the heterogeneous ion-exchange membrane having the first polarity and the homogeneous ion-exchange membrane having the second polarity are in contact is heterogeneous.

2 . The bipolar ion-exchange membrane of claim 1 , wherein the heterogeneous ion-exchange membrane comprises 50 wt % to 80 wt % of the ion-exchange resin powder comprising the ion-exchange group having the first polarity.

3 . The bipolar ion-exchange membrane of claim 1 , wherein the heterogeneous ion-exchange membrane is an extruded sheet.

4 . The bipolar ion-exchange membrane of claim 1 , wherein the binder resin is a polyolefin resin.

5 . The bipolar ion-exchange membrane of claim 1 , wherein the heterogeneous ion-exchange membrane is a cation-exchange membrane, and the ion-exchange resin powder comprises at least one cation exchange group independently selected from the group consisting of a sulfonic acid group (—SO 3 H), a carboxyl group (—COOH), a phosphonic group (—PO 3 H 2 ), a phosphinic group (—HPO 2 H), an isonic group (AsO 3 H 2 ) and a selenonic group (—SeO 3 H).

6 . The bipolar ion-exchange membrane of claim 5 , wherein the homogeneous ion-exchange membrane is an anion exchange membrane formed of a matrix resin having an anion exchange group, wherein the anion exchange membrane further comprises anion exchange resin powder having the anion exchange group.

7 . The bipolar ion-exchange membrane of claim 6 , wherein the anion exchange membrane comprises 10 wt % to 50 wt % of the anion exchange resin powder.

8 . The bipolar ion-exchange membrane of claim 6 , wherein the anion-exchange group is at least one independently selected from the group consisting of a quaternary ammonium salt (—NH 3 ), primary to tertiary amines (—NH 2 , —NHR and —NR 2 ), a quaternary phosphonium group (—PR 4 ) and a tertiary sulfonium group (—SR 3 ).

9 . The bipolar ion-exchange membrane of claim 1 , wherein the heterogeneous ion-exchange membrane is an anion-exchange membrane, and the ion-exchange resin powder has at least one anion exchange group independently selected from the group consisting of a quaternary ammonium salt (—NH 3 ), primary to tertiary amines (—NH 2 , —NHR and —NR 2 ), a quaternary phosphonium group (—PR 4 ) and a tertiary sulfonium group (—SR 3 ).

10 . The bipolar ion-exchange membrane of claim 9 , wherein the homogeneous ion-exchange membrane is a cation exchange membrane formed of a matrix resin having a cation exchange group, wherein the cation exchange membrane further comprises a cation exchange resin powder having a cation exchange group.

11 . The bipolar ion-exchange membrane of claim 10 , wherein the cation-exchange membrane comprises 10 wt % to 50 wt % of the cation exchange resin powder.

12 . The bipolar ion-exchange membrane of claim 10 , wherein the cation exchange group is at least one independently selected from the group consisting of a sulfonic acid group (—SO 3 H), a carboxyl group (—COOH), a phosphonic group (—PO 3 H 2 ), a phosphinic group (—HPO 2 H), an isonic group (AsO 3 H 2 ) and a selenonic group (—SeO 3 H).

13 . The bipolar ion-exchange membrane of claim 1 , the matrix resin is selected from the group consisting of polysulfone, polyether ether ketone, styrene-ethylene-butylene-styrene and polyphenylene oxide.

14 . A method for manufacturing a bipolar ion exchange membrane, comprising:
casting an ion exchange solution having a second polarity in which a polymer for a matrix resin comprising an ion exchange group having the second polarity is dissolved in a solvent on a surface of an ion exchange membrane having a first polarity on which an ion exchange resin powder having the first polarity and comprising the ion exchange group having the first polarity in a binder resin and drying the same to form an ion exchange membrane having the second polarity.

15 . The method of claim 14 , wherein the ion exchange membrane having the first polarity is an extruded sheet.

16 . The method of claim 14 , wherein the ion-exchange membrane having the first polarity comprises 50 wt % to 80 wt % of the ion exchange resin powder having the first polarity.

17 . The method of claim 14 , wherein the binder resin is a polyolefin resin.

18 . The method of claim 14 , wherein the ion exchange solution having the second polarity further comprises ion exchange resin powder having the second polarity comprising an ion exchange group having the second polarity.

19 . The method of claim 18 , wherein the ion exchange resin powder having the second polarity comprises 10 wt % to 50 wt % of the ion exchange membrane having the second polarity.

20 . The method of claim 14 , wherein the solvent is any one or a mixture of two or more selected from dimethyl formamide, dimethyl acetamide, N-methyl-2-pyrrolidone acetone, chloroform, dichloromethane, trichloroethylene, ethanol, methanol and normal hexane.

21 . (canceled)

Assignees

• Coway Co Ltd

Inventors

• Lee Guk-Won
• Kang Sang-Hyeon
• Moon Sung-Min
• Lee Jun-Young

Classifications

• B01D71/261

  Polyethylene · CPC title

• B01D69/1411

  containing dispersed material in a continuous matrix · CPC title

• B01D67/00793

  Dispersing a component, e.g. as particles or powder, in another component · CPC title

• B01D71/5222

  Polyetherketone, polyetheretherketone, or polyaryletherketone · CPC title

• B01D67/0013

  Casting processes · CPC title