Method of manufacturing porous fluorine-containing polymer membrane

Patent metadata

Field	Value
Publication number	US-10000617-B2
Application number	US-201514982987-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 16, 2015
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A method of manufacturing a porous fluorine-containing polymer membrane is provided, which includes mixing a fluorine-containing polymer, a pore creating agent, and a solvent to form a mixture; forming a membrane of the mixture, and removing the pore creating agent and the solvent in the membrane to form the porous fluorine-containing polymer film. The pore creating agent has a chemical formula of

wherein R 1 is a C 1-8 alkyl group, a C 2-8 alkenyl group, a C 2-8 alkynyl group, or a C 6-12 aromatic group, and A ⊖ is hydrogen sulfite ion, dihydrogen phosphate ion, nitrate ion, halogen ion, or a combination thereof. The solvent has a chemical formula of

First claim

What is claimed is:

1. A method of manufacturing a porous fluorine-containing polymer membrane, comprising:
mixing a fluorine-containing polymer, a pore creating agent, and a solvent to form a mixture;
forming a membrane of the mixture; and
removing the pore creating agent and the solvent in the membrane to form the porous fluorine-containing polymer membrane,
wherein the pore creating agent has a chemical formula of

wherein R 1 is a C 1-8 alkyl group, a C 2-8 alkenyl group, a C 2-8 alkynyl group, or a C 6-12 aromatic group, and A ⊖ is hydrogen sulfite ion, dihydrogen phosphate ion, nitrate ion, halogen ion, or a combination thereof,
wherein the solvent has a chemical formula of

2. The method as claimed in claim 1 , wherein the fluorine-containing polymer comprises poly(vinylidene fluoride), poly(vinylidenefluoride-hexafluoropropylene) copolymer, perfluoro alkoxyl polymer, fluorinated ethylene propylene copolymer, or ethylene tetrafluoroethylene copolymer.

3. The method as claimed in claim 1 , wherein the fluorine-containing polymer has a weight average molecular weight of 100,000 to 1,000,000.

4. The method as claimed in claim 1 , wherein the mixture includes 10 wt % to 15 wt % of the fluorine-containing polymer.

5. The method as claimed in claim 1 , wherein the mixture includes 75 wt % to 89 wt % of the solvent.

6. The method as claimed in claim 1 , wherein the mixture includes 1 wt % to 10 wt % of the pore creating agent.

7. The method as claimed in claim 1 , wherein the porous fluorine-containing polymer membrane has a pore size of 0.01 μm to 2 μm.

8. The method as claimed in claim 1 , wherein the porous fluorine-containing polymer membrane has a porosity of 30% to 90%.

9. The method as claimed in claim 1 , wherein a surface of the porous fluorine-containing polymer membrane and water have a contact angle of 70° to 130°.

10. The method as claimed in claim 1 , wherein the porous fluorine-containing polymer membrane has a thickness of 20 μm to 500 μm.

11. The method as claimed in claim 1 , wherein the pore creating agent and the solvent in the membrane is removed by water, alcohol, alkane, or a combination thereof.

12. The method as claimed in claim 1 , wherein the porous fluorine-containing polymer membrane has a β crystalline phase.

Assignees

• Ind Tech Res Inst

Inventors

• Ho Chia-Hua
• Chang Min-Chao
• Liang Teh-Ming
• Horng Ren-Yang
• Shao Hsin
• Huang Meng-Shun

Classifications

• B01D71/34

  Polyvinylidene fluoride · CPC title

• B01D61/366

  Apparatus therefor · CPC title

• B01D71/32 Primary

  containing fluorine atoms · CPC title

• B01D71/76

  Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 (rubbers in general B01D71/24) · CPC title

• B01D2323/18

  Pore-control agents or pore formers · CPC title