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Amphoteric ion exchange membrane and preparation method thereof

A technology of amphoteric ions and exchange membranes, which is applied in the direction of electrochemical generators, fuel cell parts, fuel cells, etc., can solve the problems of complex preparation process and unfavorable industrial production, and achieve easy industrialization, increase application value, Excellent effect with thermal stability

Inactive Publication Date: 2018-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of this method is relatively complicated, which is not conducive to industrial production.

Method used

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  • Amphoteric ion exchange membrane and preparation method thereof
  • Amphoteric ion exchange membrane and preparation method thereof
  • Amphoteric ion exchange membrane and preparation method thereof

Examples

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preparation example Construction

[0016] see figure 1 , the embodiment of the present invention provides a kind of preparation method of amphoteric ion exchange membrane, comprises the following steps:

[0017] S1, providing decafluorobenzoxadiazole, diallyl bisphenol A and a catalyst, and mixing the decafluorobenzoxadiazole, diallyl bisphenol A and the catalyst to obtain a base polymer;

[0018] S2, mixing and reacting the base polymer with a halogenating agent to form a halogenated polymer;

[0019] S3, mixing and reacting the halogenated polymer with a functionalizing agent to form a polyoxadiazole aryl ether-based graft polymer, wherein the functionalizing agent is aminosulfonic acid having bifunctional groups of amino and sulfonic acid groups compounds, and

[0020] S4, forming the polyoxadiazole aryl ether-based graft polymer into a film to form the amphoteric ion exchange membrane.

[0021] In the above step S1, the decafluorobenzoxadiazole is used as a functionalized precursor, and the structural fo...

Embodiment 1

[0077] Preparation of basic polymer: Dissolve 1.5mol of diallyl bisphenol A and 1.5mmol of decafluorobenzoxadiazole into 30ml of diethylacetamide, mix well, add 3mmol of potassium carbonate, and stir for about 8 hours in an ice-water bath , when the viscosity of the reaction solution increases significantly, pour the reaction solution into a mixed solution of 300ml methanol and deionized water (volume ratio 1:1), and the obtained white precipitate is the base polymer.

[0078] Halogenated polymer preparation: Dissolve 3.5g of base polymer into 60ml of 1,2-dichloroethane, mix well, add 0.534g of N-bromosuccinimide, and add 0.02g of azo initiator Diisobutyronitrile. After heating to reflux for 3 h, the reaction solution was slowly added dropwise to 300 ml of anhydrous methanol to obtain a yellow precipitate, which was a brominated halogenated polymer.

[0079] Preparation of polyoxadiazole aryl ether-based graft polymer: Dissolve 2.0 g of the three brominated polymers in 30 ml ...

Embodiment 2

[0082] This embodiment is basically the same as Example 1, the difference is that the amount of N-bromosuccinimide used is 1.246g, finally obtaining the sulfamic acid in each repeating unit in the polyoxadiazole aryl ether-based amphoteric ion exchange membrane The average statistical number of base branches is 1.4 (denoted AIEM-1.4).

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Abstract

The present invention relates to a preparation method for an amphoteric ion exchange membrane, comprising the following steps: providing decafluoro phenyl oxadiazole, diallyl bisphenol A and a catalyst, then mixing the decafluoro phenyl oxadiazole, the diallyl bisphenol A and the catalyst and reacting them to obtain a base polymer; mixing the base polymer with a halogenating agent and reacting them to obtain a halogenated polymer; mixing the halogenated polymer with a functional reagent and reacting them to obtain a polyoxadiazole aryl ether graft polymer; and forming the polyoxadiazole aryl ether graft polymer into a membrane to obtain the amphoteric ion exchange membrane; wherein the functional reagent is a sulphamic acid compound with dual functional groups of amino group and sulfonic acid group.

Description

technical field [0001] The invention relates to an amphoteric ion exchange membrane used in a liquid flow battery or a fuel cell and a preparation method thereof, in particular to an amphoteric ion exchange membrane based on a polyoxadiazole aryl ether group and a preparation method thereof. Background technique [0002] The field of new energy has become a hot spot in contemporary research. As a large-scale energy storage device, flow batteries such as all-vanadium redox flow batteries have received more and more attention, and are considered to have the potential to be used in energy storage equipment in the fields of wind energy, solar energy and other new energy generation fields. Fuel cells have attracted much attention due to their ability to directly convert chemical energy into electrical energy and their near-zero emissions. Ion exchange membrane is one of the important components in liquid flow battery and proton exchange membrane fuel cell. The ion exchange memb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/08C08J5/22C08L79/06H01M8/0239H01M8/0284
CPCC08G73/08C08J5/22C08L79/06H01M8/02Y02E60/50
Inventor 谢晓峰李存璞王树博
Owner TSINGHUA UNIV