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Method for preparing low-permeability proton exchange membrane for fuel cell

A technology of proton exchange membrane and fuel cell, which is applied in the direction of fuel cell parts, fuel cells, solid electrolyte fuel cells, etc., can solve the problems of inapplicability to large-scale production, achieve easy large-scale production, improve service life, Effect of improving strength and dimensional stability

Active Publication Date: 2010-04-07
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The proton exchange membrane prepared by this method has the characteristics of good compatibility between polymer solid electrolyte and expanded polytetrafluoroethylene microporous membrane, high mechanical strength and good compactness, but it needs to surface modification, not suitable for large-scale production

Method used

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  • Method for preparing low-permeability proton exchange membrane for fuel cell

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Embodiment 1

[0038] The preparation method is carried out according to the following steps:

[0039] a) In the perfluorosulfonic acid resin solution with EW value=1100, 1.5% mass concentration, according to the mass ratio of perfluorosulfonic acid resin:N,N-dimethylformamide=1:8, add N,N- Dimethylformamide, ultrasonic vibration, prepared into A solution;

[0040] b) In the perfluorosulfonic acid resin solution with EW value=1100, 5% mass concentration, according to the perfluorosulfonic acid resin:N, N-dimethylformamide=1:4 mass ratio, add N,N- Dimethylformamide, ultrasonically oscillated, configured into solution B;

[0041] c) Stretch the polytetrafluoroethylene microporous film on the support frame (hereinafter referred to as the film frame), put it into solution A for dipping, and during the solution dipping process, use ultrasonic vibration to vibrate solution A, take it out after 15 minutes, and remove the polytetrafluoroethylene The composition of the solution on the surface of th...

Embodiment 2

[0050] The preparation method is carried out according to the following steps:

[0051] a) In the perfluorosulfonic acid resin solution with EW value = 900 and 1% mass concentration, according to the mass ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1:8, add dimethyl sulfoxide and ultrasonically oscillate , formulated into A solution;

[0052] b) In the perfluorosulfonic acid resin solution with EW value = 900 and 10% mass concentration, according to the mass ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1: 4, add dimethyl sulfoxide and ultrasonically oscillate , configured as B solution;

[0053] c) Stretch the polytetrafluoroethylene microporous film on the support frame (hereinafter referred to as the film frame), put it into solution A for dipping, and during the solution dipping process, use ultrasonic vibration to vibrate solution A, take it out after 15 minutes, and remove the polytetrafluoroethylene The composition of the solution on the ...

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Abstract

The invention discloses a method for preparing a low-permeability proton exchange membrane for a fuel cell, which compounds perfluorinated sulfonic acid resin on the surface of an expanded polytetrafluoroethylene microporous membrane by combining ultrasonic soaking and spraying, wherein the ultrasonic soaking comprises of soaking the expanded polytetrafluoroethylene microporous membrane in ultrasonic oscillated perfluorinated sulfonic acid resin solution; and the spraying comprises covering, spraying and loading two lateral surfaces of the ultrasonically-soaked expanded polytetrafluoroethylene microporous membrane repeatedly till the thickness of the proton exchange membrane reaches the predetermined requirement. The method has the following characteristics that: perfluorinated sulfonic acid resin components can fully and effectively fill micropores of the expanded polytetrafluoroethylene microporous membrane through twice ultrasonic soaking in the perfluorinated sulfonic acid resin solution of different thicknesses so as to reduce air permeability; the thickness of the membrane can be accurately controlled with repeatability; the strength and dimensional stability of the membrane can be improved so as to improve the service life of the membrane; and the method can easily realize mass production.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a low-permeable proton exchange membrane and a preparation method, in particular to the technology for preparing a proton exchange membrane by means of ultrasonic impregnation-spraying combination. Background technique [0002] Due to the characteristics of the structure of the proton exchange membrane, the gas has a certain permeability in the proton exchange membrane. During the working process of the proton exchange membrane fuel cell, hydrogen and oxygen will diffuse to the counter electrode through the proton exchange membrane under the push of the gas partial pressure difference, and redox reactions will occur to generate a large amount of HO and HO2. Sexual free radicals, which will attack the polymers of the membrane material, and the molecular chains of the polymers will be degraded, which will lead to the degradation of the membrane. To this end, we need...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M8/02C08J5/22H01M8/10H01M8/0239
CPCY02E60/12Y02E60/522Y02P70/50Y02E60/50
Inventor 邢丹敏宋书范侯中军张玉海
Owner SUNRISE POWER CO LTD
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