Ion exchange membrane and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2019022634-A1
Application number	US-201615760440-A
Country	US
Kind code	A1
Filing date	Sep 19, 2016
Priority date	Sep 15, 2015
Publication date	Jan 24, 2019
Grant date	—

Abstract

A method for manufacturing an ion exchange membrane is provided. The method for manufacturing an ion exchange membrane, according to one embodiment of the present invention, comprises the step of electrospinning a support fiber producing solution and an ion exchange fiber producing solution respectively to prepare a laminate in which a support fiber mat consisting of a support fiber and an ion exchange fiber mat consisting of an ion exchange fiber are alternatively laminated. According to the present invention, it is possible to simply control factors, such as the thickness, electroconductivity and mechanical strength of the membrane, and the diameter/ratio of a pore, etc. to be suitable for the use of ion exchange membrane during the manufacturing process, to simplify the manufacturing process. As such, the ion exchange membrane manufactured by the method can be utilized as a universal ion exchange membrane which has a large ion exchange capacity, a small electrical resistance, and a small diffusion coefficient as well as excellent mechanical strength and durability.

First claim

1 . A method for manufacturing an ion exchange membrane, comprising (1) electrospinning a support fiber producing solution and an ion exchange fiber producing solution respectively to prepare a laminate in which a support fiber mat formed by accumulating a support fiber and an ion exchange fiber mat formed by accumulating an ion exchange fiber are alternately stacked.

2 . The method according to claim 1 , wherein the support fiber producing solution includes a support fiber producing component, and the support fiber producing component is one or more selected from the group consisting of polyimides, polyamic acid, polycarprolactone, polyetherimide, nylon, polyaramid, polybenzyl-glutamate, polyphenyleneterephthalamide, polyaniline, polyacrylonitrile, polyethylene oxide, polystyrene, cellulose, polymethylmethacrylate, polylactic acid (PLA), polyglycolic acid (PGA), polylactic-co-glycolic acid, poly{poly(ethylene oxide)terephthalate-co-butylene terephthalate} (PEOT/PBT), polyphosphoester (PPE), polyphosphazene (PPA), polyanhydride (PA), poly(ortho ester) (POE), poly(propylene fumarate)-diacrylate (PPF-DA}, polyvinyl alcohol, polyester, polyurethane, polyvinyl chloride, polytetra fluoroethylene (PTFE), polyethylene tetrafluoro ethylene (ETFE), polyvinylidene fluoride (PVDF), ethylene chlorotrifluoroethylene (ECTFE), polychlorotrifluoro ethylene (PCTFE), and poly(styrene-co-maleic anhydride).

3 . The method according to claim 2 , wherein the support fiber producing solution includes a support fiber producing component at 5 to 30 wt %, and the ion exchange fiber producing solution includes a cationic ion exchange fiber producing component or an anionic ion exchange fiber producing component at 5 to 60 wt %.

4 . The method according to claim 1 , wherein the ion exchange fiber producing solution includes a first ion exchange fiber producing solution containing a cationic ion exchange fiber producing component and a second ion exchange fiber producing solution containing an anionic ion exchange fiber producing component, and each of the first ion exchange fiber producing solution and the second ion exchange fiber producing solution is electrospun to form separate ion exchange fiber mats.

5 . The method according to claim 1 , after Step (1), further comprising (2) melting at least a portion of a support fiber included in the support fiber mat by applying heat and pressure to the laminate, and allowing at least a portion of the melted support fiber to permeate into pores of the ion exchange fiber mat.

6 . The method according to claim 5 , wherein a melting point of the support fiber is lower than a melting point of the ion exchange fiber.

7 . An ion exchange membrane, comprising alternately stacked support fiber mats and ion exchange fiber mats.

8 . The ion exchange membrane according to claim 7 , wherein one or more fiber mats of the support fiber mat and the ion exchange fiber mat include a web region having a three-dimensional network structure formed by fusing fibers.

9 . The ion exchange membrane according to claim 7 , wherein a weight ratio of the support fiber mat to the ion exchange fiber mat is in a range from 1:0.8 to 1.5, and a thickness ratio of a single support fiber mat and a single ion exchange fiber mat is in a range from 1:0.2 to 1:0.8.

10 . The ion exchange membrane according to claim 7 , wherein an average diameter of the support fiber included in the support fiber mat is in a range of 0.1 to 100 μm, and an average diameter of the ion exchange fiber included in the ion exchange fiber mat is in a range of 100 to 2000 nm.

11 . The ion exchange membrane according to claim 7 , wherein an average pore diameter of a single support fiber mat is in a range of 0.1 to 10 μm, and an average pore diameter of a single ion exchange fiber mat is in a range of 0.1 to 1 μm.

12 . An ion exchange membrane, comprising support fiber mats and ion exchange fiber mats alternately stacked, wherein at least a portion of a surface of one ion exchange fiber of ion exchange fibers provided in the ion exchange fiber mat includes a fused part in which a support fiber provided in a support fiber mat disposed to adjoin the ion exchange fiber mat is melted and fused.

13 . The ion exchange membrane according to claim 12 , wherein a weight ratio of the support fiber mat to the ion exchange fiber mat is in a range of 1:0.8 to 1.5, and a thickness ratio of a single support fiber mat and a single ion exchange fiber mat is in a range of 1:0.2 to 0.8.

14 . An ion exchange membrane, comprising:
an ion exchange fiber mat; and a support for supporting an ion exchange fiber by filling spaces between fibers of the ion exchange fiber mat.

15 . The ion exchange membrane according to claim 7 , wherein the ion exchange membrane is used for a liquid filter, an air filter, a capacitive deionization (CDI) device, electrodialysis (ED), or a battery separator.

Assignees

• Amogreentech Co Ltd

Inventors

• Jeong Ui Young

Classifications

• C08J5/2275

  Heterogeneous membranes · CPC title

• B01D2325/18

  Membrane materials having mixed charged functional groups · CPC title

• B01D69/02

  characterised by their properties · CPC title

• B01D71/34

  Polyvinylidene fluoride · CPC title

• B01D2325/42

  Ion-exchange membranes · CPC title