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Method for preparing perfluor sulphonic acid proton exchange membranes by liquid surface tape casting method

A technology of proton exchange membrane and perfluorosulfonic acid, which is applied in the manufacture of final products, fuel cell parts, sustainable manufacturing/processing, etc., can solve the problems of easy generation of air bubbles, casting and film formation control thickness uniformity can not meet the requirements, etc. problem, to achieve the effects of not easy to bubble, uniform heating and easy control, and simplify the steps of solution concentration

Active Publication Date: 2012-07-04
SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the solution casting film forming process, there are strict requirements on the concentration and viscosity of the solution, and the problem of easy generation of air bubbles must also be considered. Casting film formation cannot meet the requirements in terms of thickness uniformity control

Method used

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  • Method for preparing perfluor sulphonic acid proton exchange membranes by liquid surface tape casting method
  • Method for preparing perfluor sulphonic acid proton exchange membranes by liquid surface tape casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]Put perfluorosulfonic acid resin and methanol in an autoclave at a mass ratio of 2:98, heat to 180°C at a rate of 10°C / min, keep the temperature for 20 hours, and cool down at a rate of 5°C / min to obtain perfluorosulfonic acid The acid resin solution is filtered and used for later use. Add lead-tin alloy with a melting point of 180°C into a heatable stainless steel tank, and heat to melt it. Preheat the perfluorosulfonic acid resin solution obtained above to 120°C, and then add it to the surface of the molten alloy liquid. After the perfluorosulfonic acid resin solution is cast and balanced on the molten alloy liquid surface, the alloy solution is heated. The heating rate is 10°C / min, stop heating when the temperature reaches 230°C, and keep warm for 10 minutes. Then cool down to 185°C. Remove the formed membrane from the alloy liquid surface to obtain the perfluorosulfonic acid proton exchange membrane a.

[0047] The test data of the perfluorosulfonic acid proton ex...

Embodiment 2

[0049] Put perfluorosulfonic acid resin and dimethyl sulfoxide in an autoclave at a mass ratio of 30:70, heat to 200°C at a rate of 10°C / min, keep it warm for 48 hours, keep stirring during the heating and heat preservation process, stir Rate 60 rpm / min. The temperature was lowered at a rate of 5° C. / min, and the obtained solution was filtered for later use. Add a bismuth-based alloy with a melting point of 180°C into a heatable stainless steel tank, and heat to melt it. Preheat the perfluorosulfonic acid resin solution obtained above to 120°C, and then add it to the surface of the molten alloy liquid. After the perfluorosulfonic acid resin solution is cast and balanced on the molten alloy liquid surface, the alloy solution is heated. The heating rate is 10°C / min, stop heating when the temperature reaches 290°C, and keep warm for 10 minutes. Then cool down to 185°C. Remove the formed membrane from the alloy liquid surface to obtain the perfluorosulfonic acid proton exchange...

Embodiment 3

[0052] Put perfluorosulfonic acid resin and N,N-dimethylformamide in an autoclave at a mass ratio of 40:60, heat to 320°C at a rate of 5°C / min, and keep it warm for 24 hours. Keep stirring at a rate of 60 rpm / min. The temperature was lowered at a rate of 5° C. / min, and the obtained solution was filtered for later use. Add an indium-based alloy with a melting point of 160°C into a heatable stainless steel tank, and heat to melt it. Preheat the perfluorosulfonic acid resin solution obtained above to 110°C, and then add it to the surface of the molten alloy liquid. After the perfluorosulfonic acid resin solution is cast and balanced on the molten alloy liquid surface, the alloy solution is heated. The heating rate is 10°C / min, stop heating when the temperature reaches 275°C, and keep warm for 10 minutes. Then cool down to 185°C. Remove the formed membrane from the alloy liquid surface to obtain the perfluorosulfonic acid proton exchange membrane c.

[0053] The test data of t...

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Abstract

The invention relates to a novel method for preparing perfluor sulphonic acid proton exchange membranes, in particular to a method for preparing perfluor sulphonic acid proton exchange membranes by a liquid surface tape casting method, which is characterized in that the method comprises the following steps: (1) dissolving perfluorocarboxylic acid resin into an organic solvent, water or a mixture of the organic solvent and the water for forming a uniform perfluor sulphonic acid resin solution A; (2) adding materials with low melting point and high density into a heatable container, heating thecontainer for dissolving the materials, and forming uniform liquid B in the container; (3) pouring the perfluor sulphonic acid resin solution A onto the liquid B so that a thin layer solution is formed on the surface of the liquid B through tape casting; and (4) heating the liquid B to a specified temperature, then carrying out program temperature reduction for evaporating most or all of the solvent in the perfluor sulphonic acid resin solution A to obtain the perfluor sulphonic acid proton exchange membrane on the surface of the liquid B. The perfluor sulphonic acid proton exchange membrane prepared by the method of the invention has the advantages of controllable and uniform thickness and high stability, and the invention provides the selection for the large-scale industrial production of the perfluor sulphonic acid proton exchange membranes.

Description

technical field [0001] The invention relates to a method for preparing a perfluorosulfonic acid proton exchange membrane, in particular to a method for casting a membrane on a liquid surface. Background technique [0002] Proton exchange membrane (PEM) is one of the core components of proton exchange membrane fuel cell (PEMFC). An ideal proton exchange membrane has uniform thickness, good proton conductivity and chemical stability. [0003] Due to its unique chemical composition and structure, perfluorosulfonic acid proton exchange membrane not only has good proton conduction, but also has much better stability and life than non-fluorine proton exchange membranes, so it has become the most widely used proton exchange membrane. At present, the proton exchange membranes widely used in proton exchange membrane fuel cells are mainly perfluorosulfonic acid proton exchange membranes, such as the Nafion series membranes of Du Pont Company of the United States. Such films have good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08J3/02H01M8/02H01M8/10H01M8/1018H01M8/1069
CPCY02E60/523Y02E60/50Y02P70/50
Inventor 张恒唐军柯张永明
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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