Pore-filled ion exchange polyelectrolyte composite membrane from which surface ion exchange polyelectrolyte has been removed and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11975296-B2
Application number	US-201917052518-A
Country	US
Kind code	B2
Filing date	Apr 29, 2019
Priority date	May 2, 2018
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

A pore-filled ion exchange polyelectrolyte composite membrane from which the surface ion exchange polyelectrolyte has been removed and a method of manufacturing the same are provided. The ion exchange polyelectrolyte composite membrane exhibits low film resistance and low in-plane-direction swelling degree, and has a smaller film-thickness than a commercial film, and thus, can be used for various purposes. In addition, since the pore-filled ion exchange polyelectrolyte composite membrane is continuously manufactured through a roll-to-roll process, the manufacturing process is simple, and manufacturing costs can be greatly reduced.

First claim

What is claimed is:

1. A method of manufacturing a pore-filled ion exchange polyelectrolyte composite membrane from which a surface ion exchange polyelectrolyte has been removed, the method comprising:
preparing an ion exchange precursor solution including an electrolyte monomer of a quaternary ammonium salt having a cationic group or a sulfonic acid-containing electrolyte monomer having an anionic group, an acrylamide-based crosslinking agent having a tertiary amine functional group, an initiator, and a solvent;
impregnating a porous polymer support with the ion exchange precursor solution; feeding an upper film, the porous polymer support, and a lower film to a compression roll to compress the upper film and the lower film on upper and lower portions of the porous polymer support, respectively, wherein the compression is performed through squeeze compression to have a value smaller than the sum of the thickness of the porous polymer support and the thicknesses of the upper film and the lower film fed into the compression roll;
preparing a pore-filled ion exchange polymer electrolyte by crosslinking the ion exchange precursor solution by irradiating ultraviolet rays to the porous polymer support on which the upper film and the lower film are compressed; and
detaching, from a detachment roll, the porous polymer support containing the pore-filled ion exchange polymer electrolyte, the upper film, and the lower film, wherein a dominant surface roughness height of the pore-filled ion exchange polyelectrolyte composite membrane is from 250 nm to 350 nm;
wherein through the detachment, a polymer resin, which is formed by polymerization through crosslinking, formed on the outside of the porous polymer support is transferred onto the upper film and the lower film and removed from the porous polymer support.

2. The method of claim 1 , wherein the electrolyte monomer of a quaternary ammonium salt having a cationic group comprises a substance selected from (3-acrylamidopropyl) trimethylammonium chloride, (vinylbenzyl) trimethylammonium chloride, and combinations thereof.

3. The method of claim 1 , wherein the sulfonic acid-containing electrolyte monomer having an anionic group comprises a substance selected from sodium 2-acrylamido-2-methylpropane sulfonate, vinylsulfonic acid, sodium vinylsulfonate, sodium allyl sulfonate, sodium 2-methyl-2-propene-1-sulfonate, 3-sulfopropyl acrylate sodium salt, and combinations thereof.

4. The method of claim 1 , wherein the acrylamide-based crosslinking agent having a tertiary amine functional group comprises a substance selected from N,N′bis(acryloyl)piperazine, N,N′-(1,2-dihydroxyethylene)bisacrylamide, N,N′-methylenebisacrylamide, N,N′-methylenebismethacrylamide, and combinations thereof.

5. The method of claim 1 , wherein the porous polymer support has a pore volume of 40% to 50%, a pore size of 0.07 μm to 0.1 μm, and a thickness of 8 μm to 30 μm.

6. The method of claim 1 , wherein the porous polymer support is subjected to a hydrophilization treatment before being impregnated with the ion exchange precursor solution.

7. The method of claim 1 , wherein each of the upper film and the lower film includes a substance selected from poly(ethylene terephthalate) (PET), polyimide, polyvinyl chloride, low-density polyethylene, low-density polypropylene, and combinations thereof.

8. The method of claim 1 , wherein one surface of each of the upper film and the lower film in contact with the porous polymer support has been subjected to a hydrophilization treatment.

9. The method of claim 1 , wherein the value is smaller than the sum of the thickness of the porous polymer support and the thicknesses of the upper film and the lower film fed into the compression roll, by 5 μm to 20 μm.

10. The method of claim 1 , wherein an energy of the ultraviolet rays to be irradiated is 30 mW/cm2 to 50 mW/cm2.

11. The method of claim 1 , wherein during the crosslinking reaction, the temperature of the porous polymer support, the upper film and the lower film is equal to or lower than 75° C.

Assignees

• Toray Advanced Mat Korea Inc

Inventors

• Choi Young Woo
• Lee Mi Soon
• Kim Tae Young
• Yoon Young Gi
• Kim Beom Jun
• Seo Min Ho
• Jung Chi Young
• Lee Jong Min
• Jeong Nam-Jo
• Yang Seung Cheol
• Choi Ji Yeon

Classifications

• B01D69/12 Primary

  Composite membranes; Ultra-thin membranes · CPC title

• B01D2325/42

  Ion-exchange membranes · CPC title

• B01D2323/345

  UV-treatment · CPC title

• B01D2323/30

  Cross-linking · CPC title

• B01D2323/286

  Closing of pores, e.g. for membrane sealing · CPC title