A kind of high base stable benzimidazole type alkaline anion exchange membrane and preparation method thereof

A basic anion and benzimidazole technology, which is applied in the field of high-alkaline stable benzimidazole anion exchange membrane and its preparation, can solve the problems of decreased conductivity and difficulty in meeting actual needs, and achieve mild conditions and good industrial application Foreground, the effect of simple operation of the process

Active Publication Date: 2020-08-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soak the prepared membrane in 2mol / L KOH solution for 7 days, the conductivity will drop by 35%, which is difficult to meet the actual demand

Method used

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  • A kind of high base stable benzimidazole type alkaline anion exchange membrane and preparation method thereof
  • A kind of high base stable benzimidazole type alkaline anion exchange membrane and preparation method thereof
  • A kind of high base stable benzimidazole type alkaline anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, the anion exchange membrane based on 1.2-dimethylbenzimidazolium salt has the structure shown in the figure:

[0039]

[0040] The specific preparation method is:

[0041] Dissolve 0.5g of chloromethyl polysulfone with chloromethyl degree of 80% in 6.25ml of nitrogen methyl pyrrolidone, then add 1,2-dimethylbenzimidazole twice the amount of chloromethyl, and heat up to React at 80°C for 12 hours. After the reaction, pour it into 200ml of ethyl acetate, separate the precipitate, and dry it in vacuum for 24 hours to obtain a light yellow functionalized polymer.

[0042] The light yellow polymer obtained above was redissolved in 10 ml of nitrogen methyl pyrrolidone, centrifuged, poured into a glass watch glass and placed in an oven at 60° C. for 48 hours to obtain a polymer film with a thickness of 110 μm. Soak the membrane in 1mol / L KOH solution for 48 hours, and then fully wash it with distilled water until it becomes neutral to obtain an anionic pol...

Embodiment 2

[0045] In this example, the anion exchange membrane based on 1.2-dimethylbenzimidazolium salt has the structure shown in the figure:

[0046]

[0047] The specific preparation method is:

[0048] Dissolve 0.5 g of chloromethylated polysulfone with a chloromethyl degree of 100% in 6.25 ml of N,N-dimethylacetamide, and then add 1,2-dimethylbenzene 1.5 times the amount of chloromethyl and imidazole, heated to 90°C for 24 hours, after the reaction, poured into 200ml of acetonitrile, separated the precipitate, and dried in vacuum for 24 hours to obtain a light yellow functionalized polymer.

[0049] The light yellow polymer obtained above was redissolved in 10ml of N,N-dimethylacetamide, centrifuged, poured into a watch glass and placed in a 60°C oven for 48 hours to obtain a polymer film with a thickness of 108um. Soak the membrane in 1mol / L KOH solution for 48 hours, and then fully wash it with distilled water until it becomes neutral to obtain an anionic polymer membrane.

...

Embodiment 3

[0052] In this example, the anion exchange membrane based on 4,7-dimethyl-1.2-dimethylbenzimidazolium salt has the structure shown in the figure:

[0053]

[0054] The specific preparation method is:

[0055] Dissolve 0.5 g of chloromethylated polysulfone with a chloromethyl degree of 80% in 6.25 ml of nitrogen methyl pyrrolidone, and then add 4,7-dimethyl-1,2-bis Tolylbenzimidazole was heated to 80°C for 12 hours. After the reaction, it was poured into 200ml of ethyl acetate, and the precipitate was separated and vacuum-dried for 24 hours to obtain a pink functionalized polymer.

[0056] The light yellow polymer obtained above was redissolved in 10 ml of nitrogen methylpyrrolidone, centrifuged, poured into a watch glass and placed in an oven at 60°C for 48 hours to obtain a polymer film with a thickness of 108 um. Soak the membrane in 1mol / L KOH solution for 48 hours, and then fully wash it with distilled water until it becomes neutral to obtain an anionic polymer membran...

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Abstract

The invention relates to the technical field of synthesis of an anion exchange membrane, and in particular, relates to a preparation method of a high-alkali-stability benzimidazole anion exchange membrane. The method comprises the steps: 1) synthesizing a monomer; 2) carrying out a reaction with a polymer to form a film; and 3) carrying out ion exchange. Because electron donating groups are introduced to a No.4 site and a No.7 site of a benzene ring of benzimidazole, the distribution of an electron cloud of the benzene ring of benzimidazole can be changed, and the alkali stability of a benzimidazole onium cation is effectively improved. The preparation method has the advantages of simple preparation process and low cost; and the prepared membrane has good alkali stability, and has good commercial application prospects.

Description

technical field [0001] The invention relates to a high alkali stable benzimidazole type anion exchange membrane used in an alkaline anion exchange membrane fuel cell and a preparation method thereof. Background technique [0002] With the continuous improvement of people's living standards, the shortage of resources and the increasingly serious environmental problems, fuel cells have attracted more and more attention as a clean energy. The use of platinum as a noble metal catalyst in proton exchange membrane fuel cells (PEMFCs) has severely hindered its commercialization. Alkaline membrane fuel cell (AEMFC) has become a research hotspot because of its fast redox kinetics, the use of non-platinum catalysts, low material corrosion resistance requirements, and low cost. As one of the core components of alkaline membrane fuel cells, anion exchange membrane should have good chemical stability. Benzimidazole has potentially good chemical stability due to its relatively high reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08G75/23C07D235/06H01M8/1032
CPCC07D235/06C08G75/23C08J5/2256C08J2381/06H01M8/1032Y02E60/50
Inventor 潘昱王庭昀贺高红焉晓明张启东许小伟
Owner DALIAN UNIV OF TECH
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