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A kind of comb structure basic anion exchange membrane and its preparation method

A basic anion, comb structure technology, applied in the field of basic anion exchange membrane and its preparation, comb structure basic anion exchange membrane and its preparation, can solve the problem of poor film-forming properties, barriers, low ion conductivity, etc. problem, to achieve good thermal stability, easy to large area, uniform surface effect

Active Publication Date: 2021-10-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, previous studies have shown that the low ionic conductivity and poor film-forming properties of hydrogenated styrene-butadiene block copolymer (SEBS)-based alkaline membranes are the main problems hindering their further development.

Method used

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  • A kind of comb structure basic anion exchange membrane and its preparation method
  • A kind of comb structure basic anion exchange membrane and its preparation method
  • A kind of comb structure basic anion exchange membrane and its preparation method

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preparation example Construction

[0052] (1) Preparation of chloromethylated polymer:

[0053] In the hydrogenated styrene-butadiene block copolymer solution, add chloromethylation reagent and catalyst anhydrous tin tetrachloride to carry out chloromethylation reaction, after the reaction finishes, in methanol, ethanol or ethyl acetate solvent Precipitate to obtain chloromethylated hydrogenated styrene-butadiene block copolymer;

[0054] (2) Preparation of comb structure hydrogenated styrene styrene-butadiene block copolymer solution:

[0055] The chloromethylated hydrogenated styrene-butadiene block copolymer obtained in step (1) is dissolved in chloroform, dichloroethane or toluene solvent, and in the resulting solution, add Tertiary amine is reacted to obtain a comb structure hydrogenated styrene styrene-butadiene block copolymer solution;

[0056] (3) Preparation of basic anion exchange membrane:

[0057] The hydrogenated styrene styrene-butadiene block copolymer solution with a comb structure obtained ...

Embodiment 1

[0059] (1) Chloromethylation

[0060] Dissolve 3.0 g of a hydrogenated styrene-butadiene block copolymer (Kraton, A1535) with a molecular weight of about 70,000 and a styrene content of 58 wt% in 90 mL of commercially available chloroform, and use Add 13.8mL of commercially available 1,4-dichloromethoxybutane and 2.1mL of commercially available anhydrous tin tetrachloride dropwise into the dropping funnel. After the dropwise addition, heat the oil bath to 55°C, keep the temperature, and stir Reacted for 3 hours; after the reaction, the reaction solution was lowered to room temperature, poured into 300mL of absolute ethanol, and a lavender solid was precipitated, dissolved in tetrahydrofuran and precipitated with ethanol, and the operation was repeated three times, the solid turned white, and then, Place the white solid at room temperature and dry it under vacuum for 24 hours to obtain chloromethylated hydrogenated styrene styrene-butadiene block copolymer;

[0061] (2) Prepar...

Embodiment 2

[0071] (1) Chloromethylation

[0072] Dissolve 5.0 g of a hydrogenated styrene-butadiene block copolymer with a molecular weight of about 72,000 and a styrene content of 30 wt% (Kraton, G1652) in 150 mL of commercially available chloroform, mechanically stirring, and place on ice. Slowly add 5.4g of commercially available trioxane and 22.8mL of commercially available trimethylchlorosilane dropwise in a water bath. After completely dissolving, add 4.0mL of commercially available anhydrous tin tetrachloride. , kept at 0°C, stirred and reacted for 30 minutes, then raised the temperature to room temperature, kept the temperature, stirred and reacted for 2 hours, after the reaction was completed, the reaction solution was returned to room temperature, poured into 500 mL of commercially available absolute ethanol to precipitate a pale pink solid , dissolve the solid in tetrahydrofuran and precipitate it with ethanol, repeat the operation three times, the solid turns white, and then ...

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Abstract

The invention relates to a comb-like structure alkaline anion exchange membrane and a preparation method thereof, belonging to the technical field of fuel cells, and the steps are as follows: (1) preparation of chloromethylated polymer; (2) comb-like structure hydrogenation of styrene benzene The preparation of ethylene-butadiene block copolymer solution; (3) the preparation of basic anion exchange membrane: the hydrogenated styrene-styrene-butadiene block copolymer solution of step (2) gained comb structure is directly flowed After forming a film, the obtained film is dried and soaked in sodium hydroxide or potassium hydroxide solution to obtain a hydroxide-type alkaline anion exchange membrane. The preparation method of the invention has high reaction efficiency and convenience, and is easy to prepare a large-area alkaline anion exchange membrane. The comb structure can build a continuous and efficient ion transport channel in the membrane, so that the ion conductivity of the membrane can reach 57.5mS / cm. At the same time, the prepared film exhibited good thermal and chemical stability.

Description

technical field [0001] The present invention relates to a kind of alkaline anion exchange membrane and its preparation method, particularly a kind of comb structure alkaline anion exchange membrane and its preparation method (comb SEBS based block polymer alkaline membrane for fuel cell and its preparation method ), belonging to the field of fuel cell technology. [0002] technical background [0003] Nowadays, energy shortage and environmental problems are becoming more and more prominent. As a hydrogen energy conversion device, the fuel cell (Fuel Cell) has overcome the limitation of the Carnot cycle, has high energy conversion efficiency, and also has the advantages of environmental friendliness, low noise, and wide power output range. More and more attention. [0004] In December 2014, Toyota Motor Corporation of Japan launched the Mirai, a new-generation fuel cell vehicle, which pushed the commercialization of fuel cells to a new level. However, the high price hinders...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1023H01M8/1072H01M8/083C08J5/22C08L53/02
CPCC08J5/2243C08J5/2287C08J2353/02H01M8/083H01M8/1023H01M8/1072Y02E60/50
Inventor 朱红李子明王芳辉
Owner BEIJING UNIV OF CHEM TECH
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