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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 membrane, it is difficult to make a composite membrane with good density.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A mixed solvent of ethanol and water was used to heat and dissolve the waste perfluorosulfonic acid resin (EW=1100) recovered from the chlor-alkali industry in an autoclave to prepare a 5 wt% perfluorosulfonic acid solution. Dilute the 5% perfluorosulfonic acid resin solution with ethanol to a solution with a concentration of 1 wt%, and add dimethyl sulfoxide according to the ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1:8. Expanded polytetrafluoroethylene microporous film with a pore size of 0.05 μm, a porosity greater than 85%, and a thickness of 15 μm is used as the base film. After stretching the polytetrafluoroethylene microporous film on a steel frame, it is soaked in a solution for 15 Take it out after a minute. After the solution on the surface of the base film was controlled to dry, the steel frame was dried on a hot stage at 90°C. Then the perfluorosulfonic acid solution with a configured concentration of 5wt% is added to dimethyl sulfoxide ac...

Embodiment 2

[0036]A mixed solvent of ethanol and water was used to heat and dissolve the waste perfluorosulfonic acid resin (EW=1100) recovered from the chlor-alkali industry in an autoclave to prepare a 7.5 wt% perfluorosulfonic acid solution. Dilute the 7.5wt% perfluorosulfonic acid resin solution with ethanol to a 3wt% concentration solution, and add dimethyl sulfoxide according to the ratio of perfluorosulfonic acid resin: dimethyl sulfoxide = 1:8. Expanded polytetrafluoroethylene microporous film with a pore size of 0.05 μm, a porosity greater than 85%, and a thickness of 15 μm is used as the base film. After stretching the polytetrafluoroethylene microporous film on a steel frame, it is immersed in a solution for 30 Take it out after a minute. After the solution components on the surface of the base film are controlled and dried, the steel frame is dried on a hot table at 100°C. Then the perfluorosulfonic acid resin solution with a prepared concentration of 7.5wt% is added to the d...

Embodiment 3

[0038] The 5wt% Nafion solution of U.S. DuPont Company is diluted to 1.5wt% with n-propanol, and dimethylsulfoxide is added according to the ratio of Nafion resin: dimethylsulfoxide=1:8; the adopted pore diameter is 0.05 μm, and the porosity is greater than 85 %, the expanded polytetrafluoroethylene microporous film with a thickness of 15 μm 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 components on the surface of the basement film are to be controlled and dried, the steel frame is dried on a hot table at 100°C; then dimethyl sulfoxide is added to 5wt% perfluorinated resin according to the ratio of Nafion resin: dimethyl sulfoxide = 1:4 In the sulfonic acid resin solution, use spraying equipment to cover and spray both sides of the base film. Repeated spraying and drying until the thickness of the composite film reaches 75 micro...

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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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