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Preparation method of polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane

A polyvinylidene fluoride and styrene sulfonation technology, which is applied in solid electrolyte fuel cells, fuel cell parts, circuits, etc., can solve the problems of conductivity and methanol permeability, and achieves fewer synthesis steps and easy industrialization. , the effect of excellent conductivity performance

Inactive Publication Date: 2014-09-24
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent, inorganic bases are used to modify polyvinylidene fluoride powder, and inorganic particles still exist in the modified film, which will affect its electrical conductivity and methanol permeability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method is as follows:

[0020] (1) Weigh 4g of polyvinylidene fluoride powder and disperse it in methanol solution, in which 8mL of methanol solution is required for each gram of polyvinylidene fluoride, and ultrasonic for 5min to obtain suspension A; (2) mix suspension A with 2.77mol / L Tetramethylammonium hydroxide methanol solution volume ratio is 30:5, measure 5.4mL tetramethylammonium hydroxide methanol solution, add to suspension A, stir in nitrogen atmosphere, make suspension B, After 20 minutes, the suspension of brown powder was obtained, the precipitate was filtered, suction filtered, washed repeatedly with anhydrous methanol, and dried to obtain brown modified polyvinylidene fluoride powder C; (3) press powder C, styrene, The mass ratio of each component of benzoyl oxide is weighed, and 3g of powder C and 0.35g of styrene are added to absolute ethanol, wherein 10mL of absolute ethanol is required for each gram of powder C; then add 0.176g of i...

Embodiment 2

[0022] The preparation method is as follows:

[0023] (1) Weigh 4g of polyvinylidene fluoride powder and disperse it in methanol solution, in which 6mL of methanol solution is required for each gram of polyvinylidene fluoride, and ultrasonic for 5min to obtain suspension A; (2) mix suspension A with 2.77mol / L tetramethylammonium hydroxide methanol solution volume ratio is 30:5, measure 4mL tetramethylammonium hydroxide methanol solution, add to suspension A, stir in nitrogen atmosphere to prepare suspension B, 20min Finally, the suspension of brown powder was obtained, the precipitate was filtered, suction filtered, washed repeatedly with anhydrous methanol, and dried to obtain brown modified polyvinylidene fluoride powder C; (3) according to powder C, styrene, peroxide The mass ratio of each component of benzoyl, weigh 3g of powder C, 0.43g of styrene and add it to absolute ethanol, wherein 10mL of absolute ethanol is required for each gram of powder C; then add 0.05g of ini...

Embodiment 3

[0025] The preparation method is as follows:

[0026] (1) Weigh 4g of polyvinylidene fluoride powder and disperse it in methanol solution, in which 10mL of methanol solution is needed for each gram of polyvinylidene fluoride, and ultrasonic for 5min to obtain suspension A; (2) mix suspension A with 2.77mol / L Tetramethylammonium hydroxide methanol solution volume ratio is 30:3, measure 4mL tetramethylammonium hydroxide methanol solution, add to suspension A, stir in nitrogen atmosphere to prepare suspension B, 20min Finally, the suspension of brown powder was obtained, the precipitate was filtered, suction filtered, washed repeatedly with anhydrous methanol, and dried to obtain brown modified polyvinylidene fluoride powder C; (3) according to powder C, styrene, peroxide The mass ratio of each component of benzoyl is weighed 3g of powder C and 0.88g of styrene and added to absolute ethanol, wherein 10mL of absolute ethanol is required for each gram of powder C; then add 0.08g o...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane, and belongs to the field of battery electrolyte materials. The method is as follows: firstly, polyvinylidene fluoride powder is dispersed in a methanol solution in a nitrogen atmosphere, and a quaternary ammonium base is added for mixing, sedimentation, filtration, drying to obtain modified polyvinylidene fluoride powder; the modified powder, styrene and benzoyl peroxide are added into methanol for heating in the nitrogen atmosphere for reaction, the precipitation is filtered, then extracted by use of trichloromethane, and then dried to obtain the modified polyvinylidene fluoride grafted styrene powder; the powder is dissolved in an organic solvent, stirred, cooled, spread on a glass plate, then dried, and sulfonated in concentrated sulfuric acid to obtain the electrolyte membrane. The modified modified polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane prepared by the preparation method is obtained by grafting of the styrene and then sulfonation on the basis of powder modification, and the polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane is high in conductivity and low in methanol permeability, and simple in process, and can be adapted to mass production.

Description

technical field [0001] The invention relates to a preparation method of a modified powder polyvinylidene fluoride grafted styrene sulfonated electrolyte membrane, belonging to the field of battery electrolyte materials. Background technique [0002] Direct methanol fuel cell (DMFC) is a portable power source with great potential in the future. Proton exchange membrane is the core component of DMFC, and its performance directly affects the energy density and service life of DMFC. At present, the market is dominated by Nafion series membranes produced by DuPont, which have high methanol permeability and high preparation costs, and the actual application effect is not ideal. It has become the research of this technology to find proton exchange membranes with low cost and low methanol permeability. main direction. [0003] Partially fluorinated sulfonic acid proton exchange membrane has attracted people's attention. People have successfully prepared polyvinylidene fluoride graf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J7/14C08L51/00C08F259/08C08F212/08H01M8/10H01M8/02H01M8/1039H01M8/1069H01M8/1088
CPCY02E60/521Y02E60/50
Inventor 郝燕郭贵宝孙笑安胜利
Owner INNER MONGOLIA UNIV OF SCI & TECH
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