Functional group grafted porous membrane compound perfluorinated ion exchange membrane

A perfluorinated ion and ion exchange technology, applied in the direction of semi-permeable membrane separation, membrane technology, fuel cell parts, etc., can solve the problems of membrane strength reduction, fuel cell impact, gas permeability increase, etc., and achieve high mechanical strength Effects of properties and airtightness, excellent chemical stability

Active Publication Date: 2010-06-16
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

Generally speaking, when the ion exchange capacity increases, the equivalent value of perfluoropolymer decreases (equivalent value EW value decreases, ion exchange capacity IEC=10

Method used

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  • Functional group grafted porous membrane compound perfluorinated ion exchange membrane
  • Functional group grafted porous membrane compound perfluorinated ion exchange membrane
  • Functional group grafted porous membrane compound perfluorinated ion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0052] Example 1

[0053] Take 15 micron quilt

[0054]

[0055] Where h=0, i=2 A=OH

[0056] The grafted polytetrafluoroethylene membrane (porosity 80%, pore diameter 1 micron), first immersed in a solution of cerium (III) nitrate, and then immersed in 25% perfluorosulfonic acid resin ethanol-water solution, perfluorinated The structural formula of the sulfonic acid resin is (IV), n=1, p=2, the ion exchange capacity is 0.97 mmol / g, and the molecular weight is 200,000.

[0057] Then, the wet film was treated at 190°C for 20 minutes to obtain a composite film with a thickness of 16 microns.

Example Embodiment

[0058] Example 2

[0059] The molecular formula of perfluorosulfonic acid resin is (IV), n=0, p=2, ion exchange capacity is 1.35mmol / g, molecular weight is 210,000, 15% perfluorosulfonic acid resin in propanol-water solution is sprayed on a 10 micron blanket

[0060]

[0061] Where h=0, i=4 A=ONa

[0062] The grafted polytetrafluoroethylene-hexafluoropropylene membrane (porosity 85%, pore size 0.5 micron), the grafted polytetrafluoroethylene-hexafluoropropylene membrane is first immersed in a solution of manganese (II) nitrate. . Then, the wet film sample was dried in an oven at 140°C for 30 seconds. In order to completely occlude the pores in the membrane, this process step can be repeated more than 2 times. Finally, the composite membrane was treated at 1500°C for 30 minutes to obtain a composite membrane with a thickness of 20 microns.

Example Embodiment

[0063] Example 3

[0064] The structural formula of perfluorosulfonic acid resin is (IV), n=0, p=4, ion exchange capacity is 1.25mmol / g, molecular weight is 190000, and 10% isopropanol-propanol-water solution of perfluorosulfonic acid resin is prepared.

[0065] 10 micron quilt

[0066]

[0067] Where h=1, i=2 A=F

[0068] The grafted polytetrafluoroethylene membrane (porosity 90%, pore size 2-3 microns), hydrolyzed with 10% NaOH, 100°C, and soaked in the La(III)-DMF complex solution. The grafted polytetrafluoroethylene film modified with a high-valent metal and a 10% perfluorosulfonic acid resin isopropanol-propanol-water solution were screen-printed to obtain a composite film with a thickness of 11 microns.

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Abstract

The invention relates to a compound perfluorinated ion exchange membrane. The exchange membrane is formed by combining a microporous membrane serving as a reinforcing material and the ion exchange resin, wherein the microporous membrane is the fluoropolymer membrane which is grafted with a material having an ion exchange function and adopts a microporous structure, and the ion exchange resin and the material which has the ion exchange function and is grafted to the microporous membrane form physical bonding and enter the micropores of the fluoropolymer membrane. The ion exchange membrane overcomes the drawbacks of low air tightness, easy separation of the ion exchange resin from the microporous membrane and the like in the conventional microporous compound membrane and has high chemical stability and excellent mechanical property and air tightness.

Description

technical field [0001] The invention belongs to the field of functional polymer composite materials and relates to a porous membrane composite perfluorinated ion exchange membrane grafted by functional groups. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts 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 perfluorosulfonic acid proton exchange membrane has good proton conductivity and chemical stability at lower temperature (80°C) and higher humidity. However, they also have many disadvantages such as poor dimensional stability, low mechanical strength, and poor chemical stability. The water absorpti...

Claims

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Application Information

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IPC IPC(8): B01D71/32C08J7/12C08J7/18H01M8/02H01M2/16H01M8/1039H01M50/414
CPCY02E60/12Y02E60/50
Inventor 张永明唐军柯刘萍申玉鹏张恒王军
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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