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Preparation method of proton exchange membrane and polyimide perfluorosulfonic acid resin proton exchange membrane obtained thereby

A perfluorosulfonic acid resin and proton exchange membrane technology, which is applied to fuel cell parts, structural parts, battery pack parts, etc., can solve poor high temperature resistance, fuel cell safety hazards, and low conductivity of composite proton exchange membranes and other issues to achieve the effect of ensuring electrical conductivity and high temperature resistance

Inactive Publication Date: 2012-05-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems in the prior art that the composite proton exchange membrane has low electrical conductivity, poor high temperature resistance, and the fuel cell using the composite proton exchange membrane has potential safety hazards due to the existence of through holes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The invention provides a kind of preparation method of proton exchange membrane, comprises the following steps:

[0014] 1) Disperse the perfluorosulfonic acid resin in a high-boiling point organic solvent to prepare a perfluorosulfonic acid resin solution; the boiling point of the high-boiling point organic solvent is 140-205°C;

[0015] 2) Add an organic heat stabilizer and aromatic diamine to the perfluorosulfonic acid resin solution, and then add aromatic tetra-acid dianhydride to obtain a polyamic acid perfluorosulfonic acid resin solution;

[0016] 3) Coating the polyamic acid perfluorosulfonic acid resin solution on a glass plate and drying it at 70-150°C to obtain a polyamic acid perfluorosulfonic acid resin composite film;

[0017] 4) Immerse the polyamic acid perfluorosulfonic acid resin composite membrane in a mixed solvent, and perform dehydration and cyclization at room temperature to obtain a polyimide perfluorosulfonic acid resin proton exchange membrane;...

Embodiment 1

[0029] (1) Add 20g of perfluorosulfonic acid resin Nafion 112 membrane to 200ml of dimethyl sulfoxide (DMSO), and heat in an oil bath at 200°C for 3 hours to obtain a 36wt% perfluorosulfonic acid resin solution;

[0030] (2) Put 0.1mol p-phenylenediamine (PDA) and 0.1g barium stearate into the perfluorosulfonic acid resin solution in step (1) and stir evenly, then add 0.1mol pyromellitic dianhydride (PMDA) Continue stirring for 4h to prepare a polyamic acid perfluorosulfonic acid resin solution;

[0031] (3) Evenly coat the polyamic acid perfluorosulfonic acid resin solution in step (2) on a flat and smooth glass plate, and the coating dosage is 5g / cm 2 ; Then put the glass plate into an oven and bake at 100°C for 5 hours to obtain a polyamic acid perfluorosulfonic acid resin composite film;

[0032](4) Immerse the polyamic acid perfluorosulfonic acid resin composite membrane in step (3) in a mixed solvent (acetic anhydride 、 The volume ratio of pyridine is 1:1) and dehydrat...

Embodiment 2

[0034] (1) Add 10g of perfluorosulfonic acid resin Dow film to 200ml of dimethyl sulfoxide (DMSO), and heat in an oil bath at 130°C for 3 hours to obtain a 18wt% perfluorosulfonic acid resin solution;

[0035] (2) Add 0.05mol p-phenylenediamine (PDA), 0.05mol 4,4'-diaminodiphenyl ether (4,4'-ODA) and 0.1g barium stearate to the perfluorinated Stir evenly in the sulfonic acid resin solution, then add 0.02mol pyromellitic dianhydride (PMDA) and 0.08mol biphenyltetracarboxylic dianhydride (BPDA) and continue stirring for 3 hours to obtain a polyamic acid perfluorosulfonic acid resin solution;

[0036] (3) Evenly coat the polyamic acid perfluorosulfonic acid resin solution in step (2) on a flat and smooth glass plate, and the coating dosage is 1g / cm 2 ; Then put the glass plate into an oven and bake at 90°C for 8 hours to obtain a polyamic acid perfluorosulfonic acid resin composite film;

[0037] (4) Immerse the polyamic acid perfluorosulfonic acid resin composite membrane in st...

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Abstract

The present invention provides a preparation method of a proton exchange membrane. The method comprises dispersing perfluorosulfonic acid resin in an organic solvent with a high boiling point of 140-205 DEG C to obtain a perfluorosulfonic acid resin solution; adding an organic thermal stabilizer and aromatic diamine into the perfluorosulfonic acid resin solution, and adding aromatic dianhydride to obtain a polyamic acid perfluorosulfonic acid resin solution; coating the polyamic acid perfluorosulfonic acid resin solution on a glass plate, and drying to obtain a polyamic acid perfluorosulfonic acid resin composite membrane; and soaking the composite membrane in a mixed solvent containing acetic anhydride and pyridine, and allowing cyclodehydration reaction at a room temperature to obtain a polyimide perfluorosulfonic acid resin proton exchange membrane. The prepared proton exchange membrane has high electrical conductivity and good high-temperature resistance, and it is free of through holes, to thereby improve safety of batteries.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a preparation method of a proton exchange membrane and a polyimide perfluorosulfonic acid resin proton exchange membrane obtained by the method. Background technique [0002] The proton exchange membrane is an important part of the structure of the fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC for short). As the electrolyte of the fuel cell, it plays the dual role of conducting protons and separating the cathode and anode chambers. At present, the mass exchange membranes that have been commercialized are mainly Nafion membranes of Dupont Company of the United States, Dow membranes of Dow Chemical Company of the United States, Aciplex membranes of Asahi Company of Japan and Flemion membranes of Asahi Glass Company of Japan, all of which are perfluorosulfonic acid membranes. . However, the cost of perfluorosulfonic acid membranes is too high, reaching 20-30% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L79/08C08L29/10C08L27/18C08G73/10H01M8/02H01M2/16H01M8/1039H01M8/1044H01M8/1069
CPCY02E60/12Y02E60/50
Inventor 张宜虎伍伯林
Owner BYD CO LTD
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