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New process for preparing porous high polymer reinforced perfluorinated sulfonic acid resin composite membrane

A technology of perfluorosulfonic acid resin and composite membrane, which is applied in sustainable manufacturing/processing, final product manufacturing, fuel cell parts, etc., and can solve problems such as complex equipment requirements and operations, poor dimensional stability, and penetration of working media , to achieve the effects of reduced gas permeability, enhanced proton conductivity, and low pore residue

Inactive Publication Date: 2015-01-14
上海氢尚新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they also have many defects: such as poor dimensional stability, low mechanical strength, and the problem of penetration of working media still needs to be improved
[0007] Chinese patent (CN1706540A) discloses a solution, using gas pressure to make PFSA resin solution fully enter the porous matrix, which can better solve the problem of pores. However, this process requires repeated vacuum impregnation / deflation drying, and the equipment requirements and operations are complicated. Not conducive to large-scale practical application
[0008] Haolin Tang et al. (Electrochimica Acta52 (2007) 5304-5311) treated the surface of ePTFE with sodium naphthalene system and grafted hydrophilic molecules to improve the hydrophilicity of the substrate. The material introduces hydrocarbons and other groups that are easily degraded by free radicals in an electrochemical environment, leaving hidden dangers to the stability of the composite film during use.

Method used

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  • New process for preparing porous high polymer reinforced perfluorinated sulfonic acid resin composite membrane
  • New process for preparing porous high polymer reinforced perfluorinated sulfonic acid resin composite membrane
  • New process for preparing porous high polymer reinforced perfluorinated sulfonic acid resin composite membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Dissolve 20g of PFSA precursor resin with IEC=1.12 mol / kg in 180g of perfluoro(methyl decahydronaphthalene), centrifuge the solution and take the supernatant, then pass through the activated aluminum oxide chromatography column, and finally A pure solution was obtained after filtration. The ePTFE membrane is fixed with a stainless steel frame, cleaned with ethanol and dried. Then, the clean ePTFE is immersed in the PFSA precursor resin solution, removed after 5 minutes, and dried in an oven at 120 degrees for 5 minutes. In order to increase the resin loading capacity, impregnation The drying process is generally repeated three times, and finally the film is heat-treated at 160 degrees for 2 hours. The prepared composite membrane was put into 8M NaOH solution and reacted at 80°C for 48 hours for transformation treatment. After transformation, the membrane was washed with deionized water, then immersed in 3M nitric acid for 3 hours, and the nitric acid solution was change...

Embodiment 2

[0067] In this embodiment, the PFSA precursor resin of 10g IEC=1.12 mol / kg is dissolved in 190g hexafluoropropylene trimer, after the solution is centrifuged, the supernatant is taken, and then passed through the activated aluminum oxide chromatographic column, Finally, a pure solution was obtained after filtration. The ePTFE membrane is cleaned with ethanol and dried, spread flat on a clean glass plate, and then sprayed with PFSA precursor resin solution on the surface, and dried in an oven at 120 degrees for 5 minutes. In order to increase the resin load, the spraying and drying process is generally Repeat three times, and finally heat-treat the film at 160 degrees for 2 hours. The prepared composite membrane was put into 8M NaOH solution and reacted at 80°C for 48 hours for transformation treatment. After transformation, the membrane was washed with deionized water, then immersed in 3M nitric acid for 3 hours, and the nitric acid solution was changed every hour. After that...

Embodiment 3

[0069] In this embodiment, the PFSA precursor resin of 5g IEC=1.12 mol / kg is dissolved in 195g hexafluoropropylene trimer, after the solution is centrifuged, the supernatant is taken, and then passed through the activated aluminum oxide chromatographic column, Finally, a pure solution was obtained after filtration. The ePTFE membrane is fixed with a stainless steel frame, cleaned with ethanol and dried. Then, the clean ePTFE is immersed in the PFSA precursor resin solution, removed after 5 minutes, and dried in an oven at 120 degrees for 5 minutes. In order to increase the resin loading capacity, impregnation The drying process is generally repeated three times, and finally the film is heat-treated at 160 degrees for 2 hours. The prepared composite membrane was put into 8M NaOH solution and reacted at 80°C for 48 hours for transformation treatment. After transformation, the membrane was washed with deionized water, then immersed in 3M nitric acid for 3 hours, and the nitric ac...

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Abstract

The invention relates to the field of high polymer composite membrane materials, and in particular relates to a new method for preparing a high polymer membrane for a proton exchange membrane fuel cell. According to the method, the characteristic of hydrophobic property of a perfluorinated sulfonic acid (PFSA) resin precursor solution is used, the problem that in a conventional process, a hydrophilic PFSA solution and a hydrophobic reinforcing material directly generate compatibility in the compounding process is solved, and a high-performance porous high polymer reinforced PFSA composite membrane is successfully prepared. The preparation method of the porous high polymer reinforced PFSA resin composite membrane comprises the following steps of: (1) preparing a PFSA precursor solution; (2) compounding the precursor solution with a reinforcing material; (3) performing heat treatment on a load membrane; and (4) performing transformation and purification treatment to obtain the high polymer reinforced PFSA composite membrane. Compared with the prior art, the method has the characteristics of simplicity and effectiveness and is particularly suitable for industrial large-scale application, the prepared composite membrane is strong in capacity of conducting protons and capacity of resisting gas permeation, and the performance of the cell reaches a commercial Nafion.NRE211 level.

Description

technical field [0001] The invention relates to the field of polymer composite membrane materials, in particular to a preparation method of a polymer membrane material for a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts fuel chemical energy into electrical energy by electrochemical means, and is considered to be the preferred clean and efficient power generation technology in the 21st century. Proton exchange membrane (proton exchange membrane, PEM) is the key material of proton exchange membrane fuel cell (proton exchange membrane fuel cell, PEMFC). [0003] The currently used PFSA proton exchange membrane has good proton conductivity and chemical stability at lower temperature (80°C) and higher humidity. However, they also have many defects: such as poor dimensional stability, low mechanical strength, and the problem of penetration of working media still needs to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/00C08J7/04C08L27/18H01M8/10H01M8/02
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 张永明杨立滨袁望章
Owner 上海氢尚新能源科技有限公司
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