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Preparation method of compact and composite proton exchange membrane

A proton exchange membrane and composite technology, which is applied in the field of preparation of dense composite proton exchange membranes, can solve the problems of complicated operation steps, unfavorable infiltration of microporous membrane resin into micropores, etc., and achieves small particles and convenient membrane extraction. Faster, longer service life

Inactive Publication Date: 2012-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the perfluorosulfonic acid resin solution is sprayed onto the surface of the microporous membrane by spraying, it is not conducive to the wetting of the microporous membrane by the resin solution and the penetration of the resin into the micropores.
[0010] patent application document CN1724126A announced a "method for preparing composite proton exchange membrane with alkali metal perfluorosulfonic acid resin", which is characterized by the use of alkali metal ion type Sulfonic acid resin to increase the glass transition temperature of the resin, so that the resin can be well combined with polytetrafluoroethylene at high temperature to prepare an exchange membrane with good air tightness, high strength and high conductivity. It is used in proton exchange membrane fuel cells It has a good application effect, but it adopts the method of repeatedly dipping and rolling until the film becomes transparent, and the operation steps are more complicated

Method used

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  • Preparation method of compact and composite proton exchange membrane
  • Preparation method of compact and composite proton exchange membrane
  • Preparation method of compact and composite proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 0.8g of perfluorosulfonic acid resin (Nation resin), heat and dissolve the perfluorosulfonic acid resin in an autoclave with 15ml of isopropanol aqueous solution (the volume ratio of isopropanol to water is 2:1) for 5 hours to obtain perfluorosulfonic acid resin Sulfonic acid resin solution;

[0040] Add 3ml of high boiling point solvent N,N-dimethylformamide (DMF) to the perfluorosulfonic acid resin solution and mix to obtain a mixed solution;

[0041] Add silicotungstic acid and fumed silica to the above mixed solution, where the dosages of phosphotungstic acid and fumed silica are respectively 2% and 5% of the mass of Nafion, and ultrasonically disperse uniformly to obtain a uniform mixed solution of perfluorosulfonic acid resin ;

[0042] Soak and wash a polytetrafluoroethylene porous base membrane with a thickness of 10 μm (hereinafter referred to as PTFE porous base membrane) with deionized water and ethanol; coat a layer of release agent on the surface of f...

Embodiment 2

[0054] Take 1g of perfluorosulfonic acid resin (Nation resin), heat and dissolve the perfluorosulfonic acid resin in an autoclave for 1 hour with 35ml of propanol aqueous solution (the volume ratio of propanol to water is 4:1) to obtain perfluorosulfonic acid resin solution;

[0055] Add 5ml of high boiling point solvent N,N-dimethylformamide (DMF) to the perfluorosulfonic acid resin solution and mix to obtain a mixed solution;

[0056] Add two water-retaining substances phosphotungstic acid (PWA) and silica sol to the above mixed solution to obtain a mixed solution of perfluorosulfonic acid resin; the amount of PWA is 3% of Nafion resin, and the amount of silica sol is 5% of Nafion resin;

[0057] Soak and wash the PTFE porous base film with a thickness of 10 μm in deionized water and ethanol; coat a layer of release agent on the mirror corrosion-resistant surface, and then spread the PTFE porous base film on the release agent;

[0058] Then drop 2ml of the mixed solution o...

Embodiment 3

[0064] Take 1.5g of perfluorosulfonic acid resin (Nation resin), heat and dissolve the perfluorosulfonic acid resin in an autoclave for 3 hours with 45ml of isopropanol aqueous solution (the volume ratio of isopropanol to water is 8:1), and obtain perfluorosulfonic acid resin Sulfonic acid resin solution;

[0065] Add 5ml of high boiling point solvent N,N-dimethylformamide (DMF) to the perfluorosulfonic acid resin solution and mix to obtain a mixed solution;

[0066] Add fumed silica and PWA to the above mixed solution to obtain a mixed solution of perfluorosulfonic acid resin. Wherein the consumption of fumed silica and PWA is respectively 4% and 6% of Nafion resin;

[0067] Soak and wash the PTFE porous base film with a thickness of 10 μm in deionized water and ethanol; coat a layer of release agent on the surface of the flat glass, and spread the PTFE porous base film on the release agent;

[0068] Drop 1ml of a mixed solution of isopropanol and DMF on the surface of PTFE...

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Abstract

The invention provides a preparation method of a compact and composite proton exchange membrane, comprising the following steps of: dissolving perfluorinated sulfonic acid resin in alcohol aqueous solution of low boiling point; preparing to form perfluorinated sulfonic acid resin solution; then, adding solvent of high boiling point to replace solvent of low boiling point; adding water-retaining substance, such as SiO2, heteropolyacid and the like; impregnating mixed solution of alcohol of low boiling point and solvent of high boiling point in advance by a processed PTFE (Poly Tetra Fluoro Ethylene) porous basement membrane firstly; then, evenly dipping resin solution added with water retention substance onto the surface of the PTFE porous basement membrane; heating evaporating solvent andcarrying out heat treatment to obtain the composite proton exchange membrane; and rolling in to obtain the compact and composite proton exchange membrane. The preparation method is simple to operate,the composite membrane has the advantages of controllable thickness, good mechanical strength and water-retaining property, good size stability and compactness, is easy to realize large-scale production and can be used for improving the stability, the service life and the specific power of the battery if being applied to a fuel battery proton exchange membrane.

Description

technical field [0001] The invention relates to a preparation method of a proton exchange membrane for a fuel cell, in particular to a preparation method of a dense composite proton exchange membrane. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) has become the focus of attention due to its low-temperature rapid start-up, high energy conversion efficiency, environmental friendliness, and almost no emission of nitrogen and sulfur oxides and other pollutants. It is because of its outstanding advantages that it has been considered as one of the most important new energy technologies in the 21st century, and it is a strong competitor for electric vehicles, submarines and various mobile power sources. [0003] As a key component of PEMFC, the proton exchange membrane (Proton Exchange Membrane, PEM) plays the role of separating the cathode and anode and conducting protons. Therefore, the performance of the PEM directly affects the performance of the fue...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08J9/40C08L27/18H01M8/02H01M2/16H01M8/0297
CPCY02E60/12Y02E60/50Y02P70/50
Inventor 曾建皇谢义淳廖世军郭文杰
Owner SOUTH CHINA UNIV OF TECH
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