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Doped crosslinking chemical stable ion exchange membrane and preparation method thereof

A technology of ion-exchange membranes and cross-linked bridges, applied in the field of functional polymer composite materials, can solve the problems of reduced membrane strength and decreased equivalent value of perfluoropolymers, etc.

Active Publication Date: 2010-06-23
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 the perfluoropolymer decreases (the equivalent value EW value decreases, the ion exchange capacity increases IEC=1000 / EW), and the strength of the membrane also decreases

Method used

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  • Doped crosslinking chemical stable ion exchange membrane and preparation method thereof
  • Doped crosslinking chemical stable ion exchange membrane and preparation method thereof
  • Doped crosslinking chemical stable ion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The repeating unit is

[0096]

[0097] Polymer resin (EW=1200) and Zr(HPO) with a particle size of 0.008μm 4 ) 2 Mix according to 100:5 (mass ratio), then add a small amount of perfluoromalonyl peroxide and Ce 2 O 3 Powder (accounting for 0.1% of the resin mass), hot press to form a film, and then put the film in the molar concentration of 0.5M H 2 SO 4 The solution was boiled for 1 hour and washed with deionized water. After heat treatment, the film is treated with lye and acid in turn to obtain the free radical degradation substance Ce 2 O 3 A modified perfluorosulfonic acid doped cross-linked chemically stable ion membrane with a thickness of 50 μm.

Embodiment 2

[0099] The polymer tree in Example 1, 1,2-diiodotetrafluoroethane, SiO 2 (The particle size is 0.03μm, and the mass ratio of resin is 15:100), perfluorosuberyl peroxide and Mn(OH) 2 Powder (Mn(OH) 2 The added amount is 1.5% of the mass of the resin.) After being thoroughly mixed, it is heat-treated at a temperature of 100°C for 45 minutes, and then melt-extruded to obtain a film with a thickness of 100 μm. Finally, the membrane is sequentially treated with lye and acid to obtain a perfluorosulfonic acid cross-linked doped ion membrane modified by Mn ion, which is a radical scavenger.

Embodiment 3

[0101] The polymer resin of Example 1, H 3 PW 12 O 40 According to the mass ratio of 100:1, a polymer resin ethylene glycol solution with a mass concentration of 7% is prepared, and manganese (III) nitrate is added to the solution. The mass of manganese nitrate accounts for 0.05% of the resin mass. Method A film with a thickness of 30 μm was prepared at 170°C for 60 minutes. Then the membrane was cross-linked by 50KGy radiation to obtain a perfluorosulfonic acid cross-linked doped ion membrane modified by the radical scavenger Mn ion.

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Abstract

The invention relates to a doped crosslinking chemical stable ion exchange membrane, which belongs to the field of functional polymer composite materials. The doped crosslinking chemical stable ion exchange membrane is a perfluorinated ion exchange membrane which is formed by taking perfluorinated ion exchange resin with crosslinking sites as film-forming resin and simultaneously doping an inorganic substance with a water holding function or a proton conduction assisting function and a substance with a function of eliminating free radicals into the film-forming resin, so the chemical stability of the improved ion exchange membrane is greatly improved.

Description

Technical field [0001] The invention belongs to the field of functional polymer composite materials, and relates to a perfluorinated ion exchange membrane with a crosslinked structure and doped with auxiliary proton conducting material agents and free radical degradation materials and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy into electrical energy through electrochemical methods. It is considered to be the clean and efficient power generation technology of choice in the 21st century. Proton exchange membrane (PEM) is a key material of proton exchange membrane fuel cell (PEMFC). [0003] The perfluorosulfonic acid proton exchange membrane currently used has good proton conductivity and chemical stability at lower temperatures (such as 80°C) and higher humidity. However, they also have many defects, such as poor dimensional stability, low mechanical strength, and...

Claims

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Application Information

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IPC IPC(8): B01D71/32H01M8/02H01M2/16C08L27/18C08K3/32C08K5/14C08K3/26C08K3/22C08K3/24C08K3/28H01M8/1027H01M8/1039H01M8/1046H01M8/1069
CPCY02E60/50Y02E60/12
Inventor 唐军柯张永明张恒王军
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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