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Microporous membrane reinforced perfluoro crosslinked ion exchange membrane

A perfluorinated ion, microporous membrane technology, used in semipermeable membrane separation, membrane technology, electrical components, etc., can solve the problems of low mechanical strength, decreased perfluoropolymer equivalent value, and unstable alkali.

Active Publication Date: 2011-04-06
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

However, they also have many defects: such as poor dimensional stability, low mechanical strength, poor chemical stability, etc.
[0009] US20070031715 describes the cross-linking method of sulfonyl chloride cross-linking to generate sulfonyl anhydride. The sulfonyl anhydride cross-linking structure formed in this method can effectively improve the mechanical strength of the membrane, but the cross-linking structure has obvious disadvantages: sulfonyl chloride Anhydride units are unstable to bases
Generally speaking, when the ion exchange capacity increases, the equivalent value of perfluoropolymer decreases (equivalent value EW value decreases, ion exchange capacity IEC=1000 / EW) and the strength of the membrane also decreases
At the same time, the gas permeability of the membrane also increases, which will have a very serious impact on the fuel cell

Method used

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  • Microporous membrane reinforced perfluoro crosslinked ion exchange membrane
  • Microporous membrane reinforced perfluoro crosslinked ion exchange membrane
  • Microporous membrane reinforced perfluoro crosslinked ion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Convert the repeating unit to

[0071]

[0072], polymer resin of EW=950 and cerium carbonate (accounting for 0.01% of resin quality) are dissolved in propanol-water, make total mass concentration and be 5% propanol-water solution, join then and be that mass concentration is 5% super In the oxidized perfluoromalonyl-DMF solution, a 30 μm thick surface sulfonated expanded polytetrafluoroethylene porous film (porosity 70%) was placed in the above solution and soaked for about 1 hour, and then the soaked membrane was heated Drying is carried out on the board, during which the film is rolled with rubber rollers. After vacuum drying at 80° C. for 12 hours, the membrane was peeled off, and the membrane was heat-treated to obtain a single-layer perfluorosulfonic acid double cross-linked ion membrane.

Embodiment 2

[0074] Convert the repeating unit to

[0075]

[0076] , EW=1100 polymer resin and lanthanum acetate (lanthanum acetate accounts for 0.001% of the resin quality) are mixed to make a total mass concentration of 3% polymer resin solution, the porous Al 2 o 3 The film (with a porosity of 50%) was immersed in the above solution, and after 30 minutes, the film was taken out and dried, and then the film was cross-linked by 50KGy radiation to obtain a double cross-linked structure ionic film with a thickness of 20 μm.

Embodiment 3

[0078] Convert the repeating unit to

[0079]

[0080] , EW=1300 polymer resin, the surface is covered with perovskite structure La 0.7 Ce 0.15 Ca 0.15 MnO 3 (accounting for 0.3% of the resin mass), azobisisovaleronitrile and 1,,4-diiodooctafluorobutane were dissolved in DMF, and phosphoric acid-modified ZrO 2 A microporous membrane (80% porosity, 20 μm in thickness) was immersed therein for 30 minutes, and then treated at 170° C. for 60 minutes to prepare a double cross-linked membrane with a thickness of 20 μm.

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Abstract

The invention relates to a microporous membrane reinforced perfluoro dual crosslinked ion exchange membrane and a preparation method thereof, belonging to the field of functional polymer composites. The ion exchange membrane is characterized in that perfluorinated ion exchange resins are filled into the microporous membrane, meanwhile, chemical crosslinking structures are formed among the perfluoro ion exchange resin molecules, and added high-valence metal compounds are physically bonded and crosslinked with the acidic exchange groups on the chemical crosslinking structures, thereby forming a dual network structure. The ion exchange membrane prepared by the invention has higher dimensional stability and good mechanical strength.

Description

technical field [0001] The invention belongs to the field of functional polymer composite materials, and relates to a perfluorinated cross-linked ion exchange membrane reinforced by a microporous membrane. 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 defects: such as poor dimensional stability, low mechanical strength, and poor chemical stability. The water absorption rate o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/32H01M8/02H01M2/16C08L27/18C08K3/28C08K3/30C08K3/26C08K3/32C08K5/098C08L5/16C08J3/24C08J5/22H01M8/102
CPCY02E60/50Y02E60/12
Inventor 张永明唐军柯刘萍张恒王军
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD