Porous hydrophobic fluorine-containing polymer membrane and production methods thereof

Patent metadata

Field	Value
Publication number	US-2017174857-A1
Application number	US-201514982987-A
Country	US
Kind code	A1
Filing date	Dec 29, 2015
Priority date	Dec 16, 2015
Publication date	Jun 22, 2017
Grant date	—

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 100000 to 1000000.

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.

13 . A porous fluorine-containing polymer membrane, being a fluorine-containing polymer treated by a pore creating agent and having a β crystalline phase,
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.

14 . The porous fluorine-containing polymer membrane as claimed in claim 13 , being free of an α crystalline phase.

15 . The porous fluorine-containing polymer membrane as claimed in claim 13 , wherein the fluorine-containing polymer comprises poly(vinylidene fluoride), poly(vinylidenefluoride-hexafluoropropylene) copolymer, perfluoro alkoxyl polymer, fluorinated ethylene propylene copolymer, or ethylene tetrafluoroethylene copolymer.

16 . The porous fluorine-containing polymer membrane as claimed in claim 13 , wherein the fluorine-containing polymer has a weight average molecular weight of 100000 to 1000000.

17 . The porous fluorine-containing polymer membrane as claimed in claim 13 , having a pore size of 0.01 μm to 2 μm.

18 . The porous fluorine-containing polymer membrane as claimed in claim 13 , having a porosity of 30% to 90%.

19 . The porous fluorine-containing polymer membrane as claimed in claim 13 , wherein a surface of the porous fluorine-containing polymer membrane and water have a contact angle of 70° to 130°.

20 . The porous fluorine-containing polymer membrane as claimed in claim 13 , having a thickness of 20 μm to 500 μm.

Assignees

• Ind Tech Res Inst

Inventors

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

Classifications

• B01D71/32 Primary

  containing fluorine atoms · CPC title

• B01D71/34

  Polyvinylidene fluoride · CPC title

• B01D2323/18

  Pore-control agents or pore formers · CPC title

• C08J9/26 Primary

  by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out · CPC title

• C08J9/28

  by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum · CPC title