Method for preparing perfluorocarboxylic acid ion membranes by liquid surface tape casting method

A technology of perfluorocarboxylic acid ion and perfluorocarboxylic acid, which is used in the manufacture of final products, collectors/separators, components of fuel cells, etc. problems, to ensure the uniformity and stability of heating, simplify the tedious operation process, and achieve the effect of good uniformity

Active Publication Date: 2010-06-30
SHANDONG DONGYUE POLYMER MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has too many procedures and cumbersome operation, which is not conducive to mass production
There are also researchers who mix perfluorocarboxylic acid ion exchange resins with -COOH and -COONa structures and solvents to prepare a solution, and then cast the solution on the surface of the solid phase to form a film. During the film formation process of this casting method, The concentration of the casting solution is high and must have a certain viscosity. The parameters of the solution have a great influence on the result of casting film formation. Moreover, the material, flatness, and thermal expansion coefficient of the casting substrate will affect the thickness of the film. Uniform and stable performance

Method used

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  • Method for preparing perfluorocarboxylic acid ion membranes by liquid surface tape casting method
  • Method for preparing perfluorocarboxylic acid ion membranes by liquid surface tape casting method

Examples

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Effect test

Embodiment 1

[0045] Put perfluorocarboxylic acid resin and ethanol in an autoclave at a mass ratio of 3:97, heat to 160°C at a rate of 10°C / min, keep the temperature for 20 hours, and cool down at a rate of 5°C / min to obtain the perfluorocarboxylic acid resin The acid resin solution is filtered and used for later use. Add lead-tin alloy with a melting point of 180°C into a heatable stainless steel tank, and heat to melt it. Preheat the perfluorocarboxylic acid resin solution obtained above to 120°C, and then add it to the surface of the molten alloy liquid. After the perfluorocarboxylic acid resin solution is cast and balanced on the molten alloy liquid surface, the alloy solution is heated. The heating rate is 10°C / min, stop heating when the temperature reaches 200°C, keep warm for 10 minutes, then cool down to 185°C. During this process, N 2 for protection. Remove the formed film from the alloy liquid surface to obtain the perfluorocarboxylic acid ion film.

[0046] The test data of ...

Embodiment 2

[0048] Put perfluorocarboxylic acid resin and dimethyl sulfoxide in an autoclave at a mass ratio of 35:65, heat to 170°C at a rate of 10°C / min, keep it warm for 18 hours, keep stirring during the heating and heat preservation process, stir Rate 60 rpm / min. The temperature was lowered at a rate of 5° C. / min, and the obtained solution was filtered for later use. Add a bismuth-based alloy with a melting point of 180°C into a heatable stainless steel tank, and heat to melt it. Preheat the perfluorocarboxylic acid resin solution obtained above to 120°C, and then add it to the surface of the molten alloy liquid. After the perfluorocarboxylic acid resin solution is cast and balanced on the molten alloy liquid surface, the alloy solution is heated. The heating rate is 10°C / min, stop heating when the temperature reaches 240°C, and keep warm for 10 minutes. Then cool down to 185°C. During this process, He has been fed in for protection. Remove the formed film from the alloy liquid s...

Embodiment 3

[0051] Put the perfluorocarboxylic acid resin and N,N-dimethylformamide in an autoclave at a mass ratio of 50:50, heat it to 220°C at a rate of 5°C / min, and keep it warm for 24 hours. During the heating and heat preservation process, Keep stirring at a stirring rate of 2000 rpm / min. The temperature was lowered at a rate of 2° C. / min, and the obtained solution was filtered for later use. Add an indium-based alloy with a melting point of 160°C into a heatable stainless steel tank, and heat to melt it. Preheat the perfluorocarboxylic acid resin solution obtained above to 110°C, and then add it to the surface of the molten alloy liquid. After the perfluorocarboxylic acid resin solution is cast and balanced on the molten alloy liquid surface, the alloy solution is heated. The heating rate is 10°C / min, stop heating when the temperature reaches 195°C, and keep warm for 10 minutes. Then cool down to 175°C. During this process, Ne is always connected for protection. Remove the form...

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Abstract

The invention relates to a method for preparing perfluorocarboxylic acid ion membranes, which is characterized in that the method comprises the following steps: (1) dissolving perfluorocarboxylic acid resin into a solvent for forming a uniform perfluorocarboxylic acid resin solution A; (2) adding materials with low melting point and high density into a heatable container, heating the container for dissolving the materials, and forming uniform liquid B in the container; (3) preheating the perfluorocarboxylic acid resin solution A and pouring the perfluorocarboxylic acid resin solution A onto the surface of the liquid B protected by nitrogen gas so that a thin layer solution is formed on the surface of the liquid B through casting; (4) heating the liquid B, then carrying out program temperature reduction, and continuously introducing the nitrogen gas for protection in the whole process; and (5) evaporating most or all of the solvent in the perfluorocarboxylic acid resin solution A to obtain the perfluorocarboxylic acid ion membrane on the surface of the liquid B. The perfluorocarboxylic acid ion membrane prepared by the invention can be applied to composite layers of sodium hudroxide use ion membranes, and has the advantages of uniform thickness, difficult bubble generation and stable performance, and the invention provides reliable carboxylic acid layer ion membranes for producing the sodium hudroxide use ion membranes.

Description

technical field [0001] The invention relates to a method for preparing a perfluorocarboxylic acid ion membrane, in particular to a method for preparing a perfluorocarboxylic acid ion membrane by a liquid surface casting method. Background technique [0002] The technology of preparing chlor-alkali by perfluorinated ion membrane is a revolution in the chlor-alkali industry. It is a chlor-alkali production technology with low energy consumption, no pollution, and high product quality. my country has introduced nearly 10 million tons from the United States and Japan in more than ten years. The complete set of ion membrane equipment has greatly improved the equipment level of my country's chlor-alkali industry and solved the problem that my country's high-quality caustic soda needs to be imported. With the progress of society and the development of science and technology, caustic soda by mercury method and part of caustic soda by graphite anode diaphragm method will be completely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J3/02H01M8/02H01M8/10H01M8/0202H01M8/1069H01M8/1081
CPCY02E60/523Y02E60/522Y02E60/50Y02P70/50
Inventor 杨玉生
Owner SHANDONG DONGYUE POLYMER MATERIAL
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