Technique for shaping composite proton exchange membrane for fuel cell

A proton exchange membrane and fuel cell technology, which is applied to fuel cell parts, fuel cells, battery pack parts, etc., can solve the problems of composite membranes and the difficulty of making compactness, so as to improve electrical conductivity and facilitate The effects of large-scale production and easy control of morphological changes

Active Publication Date: 2008-10-01
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the continuous production of PTFE porous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1:

[0034] A mixed solvent of ethanol and water is used to heat and dissolve the recovered perfluorosulfonic acid resin (EW=1100) from the chlor-alkali industry in an autoclave to prepare a 5wt% perfluorosulfonic acid solution. The 5% perfluorosulfonic acid resin solution was diluted with ethanol to a solution with a concentration of 1 wt%, and dimethyl sulfoxide was added in a ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1:8. Use an expanded polytetrafluoroethylene microporous film with a pore size of 0.05μm, a porosity greater than 85%, and a thickness of 15μm as the base film. After the polytetrafluoroethylene microporous film is stretched on the steel frame, it is infiltrated in the solution. Take it out in minutes. After the solution on the surface of the base film is dried, the steel frame is dried on a hot stage at 90°C. Then, the prepared perfluorosulfonic acid solution with a concentration of 5wt% is added to dimethyl sulfoxide according to ...

Example Embodiment

[0035] Example 2

[0036]A mixed solvent of ethanol and water is used to heat and dissolve the recovered perfluorosulfonic acid resin (EW=1100) from the chlor-alkali industry in an autoclave to prepare a 7.5wt% perfluorosulfonic acid solution. The 7.5 wt% perfluorosulfonic acid resin solution was diluted with ethanol to a 3 wt% concentration solution, and dimethyl sulfoxide was added in a ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1:8. Use an expanded polytetrafluoroethylene microporous film with a pore size of 0.05μm, a porosity greater than 85%, and a thickness of 15μm as the base film. Take it out in minutes. After the solution composition on the surface of the base film is controlled, the steel frame is dried on a hot stage at 100°C. Then, the prepared perfluorosulfonic acid resin solution with a concentration of 7.5wt% was added to dimethyl sulfoxide in a ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1:4, and spraying equipment was used to apply...

Example Embodiment

[0037] Example 3

[0038] Dilute the 5wt% Nafion solution of DuPont Company in the United States to 1.5wt% with n-propanol, and add dimethyl sulfoxide according to the ratio of Nafion resin: dimethyl sulfoxide = 1:8; the pore size is 0.05 μm, and the porosity is greater than 85 %, the expanded polytetrafluoroethylene microporous film with a thickness of 15μm is used as the base film. After the polytetrafluoroethylene microporous film is stretched on the steel frame, it is soaked in the above solution and taken out after 30 minutes. After the solution composition on the surface of the dry base film is controlled, the steel frame is dried on a hot stage at 100°C; then dimethyl sulfoxide is added to 5wt% perfluoro in a ratio of Nafion resin: dimethyl sulfoxide = 1:4 In the sulfonic acid resin solution, spraying equipment is used to cover and spray both sides of the base film. Repeated spraying and drying until the thickness of the composite film reaches 75 microns. The composite film...

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Abstract

A moulding technology of a compound proton exchange membrane of a fuel cell, comprising a technology that coats a perfluorinated sulfonic acid resin on a bulked polyfluortetraethylene micropore basement membrane, characterized in that the technology that coats a perfluorinated sulfonic acid resin on a bulked polyfluortetraethylene micropore basement membrane comprises dipping the polyfluortetraethylene micropore basement membrane in a diluted solution of the perfluorinated sulfonic acid, coating the perfluorinated sulfonic acid resin solution on both sides of the basement membrane and heat moulding a compound membrane. The technology of the invention solves the technical problem that in same compound membrane preparation technology, the polyfluortetraethylene membrane is hard to control and membrane forming thickness accuracy and productivity effect are low and so on. The deformation of the polyfluortetraethylene membrane in the process of spray coating of the compound membrane does not exist and the invention has advantages that the invention is easy to expand production, is low in request of spray coating technology and device and the evenness of the thickness of the compound membrane that is spray moulded is high.

Description

technical field [0001] The invention relates to a preparation method of a composite proton exchange membrane for a fuel cell, in particular to a technique for preparing a composite proton exchange membrane by a spray coating method. Background technique [0002] At present, the most widely used proton exchange membrane in the field of proton exchange membrane fuel cells is the Nafion membrane of Dupont Company, which can basically meet the functional requirements of fuel cells. However, with the development of fuel cell technology, Nafion membranes have disadvantages such as poor dimensional stability, low service life and high price in the dynamic working conditions of automobiles, which restrict the development of fuel cell technology. At present, fuel cell research institutions in various countries are actively developing new proton exchange membrane products to meet the needs of fuel cell technology development. [0003] The enhanced composite proton exchange membrane i...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16C08J5/22H01M8/1086
CPCY02E60/50Y02P70/50
Inventor 侯中军邢丹敏宋书范张玉海
Owner SUNRISE POWER CO LTD
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