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Preparation process of composite proton exchanging member based on hydrophilic porous poly tetrafluoro ethylene matrix

A technology of polytetrafluoroethylene membrane and polytetrafluoroethylene, which is applied in the field of preparation of composite proton exchange membranes, can solve problems such as the difficulty of perfluorosulfonic acid resin solution entering porous polytetrafluoroethylene, and achieve low gas permeability and mechanical The effect of high performance and strong proton conductivity

Inactive Publication Date: 2008-05-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophobicity of porous polytetrafluoroethylene and the pore size is only about 1 micron, and the perfluorosulfonic acid resin is actually a strong hydrophilic material, even if a surfactant is added to the perfluorosulfonic acid resin solution, however It is also difficult for perfluorosulfonic acid resin solution to enter porous polytetrafluoroethylene [Electrochimica Acta 50, 2004, 571-575]

Method used

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  • Preparation process of composite proton exchanging member based on hydrophilic porous poly tetrafluoro ethylene matrix
  • Preparation process of composite proton exchanging member based on hydrophilic porous poly tetrafluoro ethylene matrix
  • Preparation process of composite proton exchanging member based on hydrophilic porous poly tetrafluoro ethylene matrix

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Embodiment 1

[0030] Take a porous polytetrafluoroethylene (PTFE) membrane with a thickness of 10 microns, a pore size of 0.05 to 2 microns, and a porosity of 85%, and use Ar gas to treat the surface of PTFE. The free radicals generated by Ar gas can react with oxygen or water in the air. The reaction forms peroxide, which further cross-links and polymerizes with the functional monomer-acrylic acid to obtain a hydrophilic surface. The porous polytetrafluoroethylene membrane after hydrophilic treatment is placed in the isopropanol solution of 5% (mass) perfluorinated proton conductive resin (Nafion, EW value 1100) and soaked for 10 minutes, then taken out and rolled by two wheels Press once, put the rolled film into a vacuum drying oven, adjust the temperature to 160°C, heat-treat for 60 seconds, repeat the above dipping process 4 times to obtain a transparent composite film; soak the film in isopropanol for 5 minutes Remove organic impurities, then soak in boiling deionized water for 10 min...

Embodiment 2

[0033] Take a porous polytetrafluoroethylene (PTFE) membrane with a thickness of 12 microns, a pore size of 0.05 to 2 microns, and a porosity of 85%, pretreat the PTFE membrane with Ar plasma, and then use hydrophilic functional monomers such as acrylic acid and sodium styrene sulfonate The graft copolymerization reaction of salt, N,N-dimethylacetamide and glycidyl methacrylate aqueous solution was induced by near ultraviolet light. Place the porous polytetrafluoroethylene membrane after hydrophilic treatment in 5% (mass) sulfonated polyetheretherketone resin (s-PEEK, EW value 900) and 2% (mass) Trinton-100 ethanol solution for immersion Take it out for 10 minutes, then take it out and roll it again with double-wheel rollers, put the rolled film into a vacuum drying oven, adjust the temperature to 230°C, heat treatment for 50 seconds, repeat the above impregnation process 5 times, and obtain a transparent composite film; Soak the film in isopropanol for 5 minutes to remove org...

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Abstract

A composite proton exchange membrane base on hydrophilic porous polytetrafluoroethene and used for fuel battery is prepared through hydrophilic treating to porous polytetrafluoroethene, filling proton conducting resin, heat treating and protonating. It has high proton conductivity, mechanical strength and gas permeability.

Description

technical field [0001] The invention relates to a preparation method of a proton exchange membrane which provides hydrogen ion channels for electrolytes and simultaneously serves as a diaphragm to isolate two pole reaction gases in a proton exchange membrane fuel cell. Specifically relates to a preparation method of a composite proton exchange membrane based on a hydrophilic porous polytetrafluoroethylene matrix. Background technique [0002] Proton exchange membrane (PEM) is the key material of proton exchange membrane fuel cell (PEMFC), and its performance characteristics are closely related to the output performance of the fuel cell. An ideal proton exchange membrane should not only have good proton conductivity and chemical stability, but also low gas permeability, sufficient mechanical strength and good dimensional stability [Fuel Cells and Their Applications, 1996, Chapter 4 ]. [0003] At present, proton exchange membrane fuel cells mainly use perfluorosulfonic acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L27/18B29C71/00H01M8/02H01M8/1018H01M8/1041H01M8/1069
CPCY02E60/50
Inventor 唐浩林刘珊珊王晓恩潘牧袁润章
Owner WUHAN UNIV OF TECH
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