Porous fluorine-based resin composite membrane and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-11654403-B2
Application number	US-201917044745-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Jul 12, 2018
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

The present disclosure relates to a porous fluorine-based resin composite membrane having excellent water repellency and oil repellency, and a method for producing the same.

First claim

The invention claimed is:

1. A method for producing a porous fluorine-based resin composite membrane comprising the steps of:
providing a porous fluorine-based resin layer having pores therein,
preparing a coating solution including a (co)polymer containing a repeating unit derived from a perfluoroalkyl acrylate having 1 to 10 carbon atoms and a perfluoroalkanoic acid having 3 to 10 carbon atoms,
coating the coating solution onto at least one surface of the porous fluorine-based resin layer and an outer surface of the pores to produce a coating layer, and
decomposing the perfluoroalkanoic acid having 3 to 10 carbon atoms from the coating layer.

2. The method for producing a porous fluorine-based resin composite membrane according to claim 1 ,
wherein the (co)polymer includes a (co)polymer of perfluoroalkyl acrylate having 1 to 10 carbon atoms, alkyl acrylate having 1 to 10 carbon atoms, vinyl chloride, and a crosslinkable monomer.

3. The method for producing a porous fluorine-based resin composite membrane according to claim 2 ,
wherein the crosslinkable monomer is a monomer having a hydroxyl group, a carboxyl group, an epoxy group, or a nitrogen-containing functional group, wherein the nitrogen-containing functional group is an isocyanate group, urethane, amine, amide, or urea.

4. The method for producing a porous fluorine-based resin composite membrane according to claim 1 ,
wherein the coating solution includes 2 to 10% by weight of the (co)polymer and 5 to 15% by weight of the perfluoroalkanoic acid having 3 to 10 carbon atoms.

5. The method for producing a porous fluorine-based resin composite membrane according to claim 1 ,
wherein the coating solution further includes an amine compound or ammonia.

6. The method for producing a porous fluorine-based resin composite membrane according to claim 5 ,
wherein the amine compound or ammonia is contained in an amount of 0.1 to 5% by weight based on the total weight of the perfluoroalkanoic acid having 3 to 10 carbon atoms and amine compound or ammonia.

7. The method for producing a porous fluorine-based resin composite membrane according to claim 1 ,
wherein the coating solution further includes an organic solvent or water.

8. The method for producing a porous fluorine-based resin composite membrane according to claim 1 ,
wherein the step of coating the coating solution onto the at least one surface of the porous fluorine-based resin layer and the outer surface of the pores is performed as a single step.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sin Woo
• Park Seijung
• Ahn Byeong In
• Ko Hyun Seong

Classifications

• B01D71/403

  Polymers based on the polymerisation of maleic acid or derivatives thereof · CPC title

• B01D67/00931

  by introduction of specific groups after membrane formation, e.g. by grafting · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• B01D71/301

  Polyvinylchloride · CPC title

• B01D2325/0283

  Pore size · CPC title