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Perfluoro ion exchange solvated film used for electolysis and its preparation method

A technology of perfluorinated ions and perfluorosulfonic acid ions, which is applied in the direction of electrolysis process, electrolytic components, organic diaphragms, etc., can solve the problems of reducing the conductive surface area, increasing the resistance, affecting the service life, etc., and reducing the conductive barrier area, reduce the barrier effect, and prolong the service life

Inactive Publication Date: 2007-02-07
SHANDONG HUAXIA SHENZHOU NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different structures and properties of the polymers between the film layers and the different exchange capacities, as well as the differences in the types of exchange groups, there are different water absorption and expansion rates between the layers, and there are differences between the layers. The physical interface does not reach the molecular level combination, which often leads to cracking and delamination during use and needs to be repaired or replaced, which seriously affects the service life
Unreinforced ion-exchange membranes are extremely susceptible to damage and are not dimensionally stable when the electrolyte concentration changes
The traditional method is to use mesh cloth for reinforcement, which is very effective in increasing the mechanical strength and dimensional stability of the membrane, but due to the use of mesh cloth reduces the conductive surface area and correspondingly increases the resistance of the membrane

Method used

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  • Perfluoro ion exchange solvated film used for electolysis and its preparation method
  • Perfluoro ion exchange solvated film used for electolysis and its preparation method
  • Perfluoro ion exchange solvated film used for electolysis and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0061] with tetrafluoroethylene and

[0062]

[0063] Where m=0-3, n=2 or 3

[0064] Copolymerize to obtain perfluorosulfonic acid resin S, the IEC value of this kind of resin is 0.95mmol / g, the resin is converted into acid form and dissolved in ethylene glycol, then the concentration of the solution is concentrated to 20%, and 5% of the resin weight is added The perfluoropolymer reinforced microfibers have a length of 0.05-30 μm and a diameter of 0.02-50 μm. Apply the obtained slurry on a metal template and dry at 240°C for 1 minute to obtain the first ion exchange layer with a thickness of about 125 μm;

[0065] with tetrafluoroethylene and

[0066]

[0067] m=0-3, n=2-3

[0068] Resin C was obtained by copolymerization, and the IEC of the resin was 1.20 mmol / g. The resin C and resin S were mixed according to the ratio of 60:40, converted into acid form, dissolved in ethylene glycol, and concentrated to 10%. Add 5% perfluoropolymer reinforced microfibers by weight ...

Embodiment 2

[0071] The perfluorosulfonic acid resin with IEC value of 0.95mmol / g is converted into acid form and dissolved in N-methylpyrrolidone, then the concentration of the solution is concentrated to 20%, and 15% perfluoropolymer of resin weight is added to strengthen micro The length of the microfiber is 0.05-30 μm, and the diameter is 0.02-50 μm. Apply the obtained slurry on the release paper, and dry at 220°C for 1 minute to obtain the first ion exchange layer with a thickness of about 210 μm;

[0072] After converting IEC=1.20mmol / g carboxylic acid resin into acid form, dissolve it in ethylene glycol, concentrate to 20%, add perfluoropolymer reinforced microfibers with 10% resin weight, the length of microfibers is 0.05-30μm, The diameter is 0.02-50μm, the solution is directly applied to the first ion exchange layer, and dried at 100°C for 2 minutes to obtain a second ion exchange layer with a thickness of about 55μm; and then dried for 5 minutes to obtain the final dry film thic...

Embodiment 3

[0074] After converting the sulfonic acid resin of IEC=1.20mmol / g into acid form, dissolve it in N, N-dimethylformamide, then concentrate the solution to 10%, and add 10% perfluoropolymer reinforced microfiber by resin weight , the length of the microfiber is 0.05-30 μm, and the diameter is 0.02-50 μm. Apply the obtained slurry on a glass template and dry at 250°C for 1 minute to obtain the first ion exchange layer with a thickness of about 78 μm;

[0075] The copolymerized perfluorinated ion exchange resin (IEC=0.95mmol / g, wherein the ratio of sulfonic acid group and carboxylic acid group is 5:2) containing both sulfonic acid groups and carboxylic acid groups is converted into acid form Afterwards, it is dissolved in ethylene glycol-benzyl ether, and then the solution is concentrated to 10%, and 10% by weight of the resin is added with perfluoropolymer reinforced microfibers, the length of the microfibers is 0.05-30 μm, and the diameter is 0.02-50 μm. Apply the obtained slur...

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Abstract

A perfluoro-ion exchange membrane for electrolysis is prepared from the perfluoro-ion exchange resin containing sulfo and / or carboxy radicals through dissolving it in volatile solvent and program controlled coating of the solution on the template several times to form a multi-layer membrane containing the perfluoropolymer fibres as reinforcing material in at least one layer. Its advantages are low membrane resistance for high electric current efficiency and high mechanical strength and stability.

Description

technical field [0001] The invention relates to a perfluorinated ion exchange membrane and a processing method thereof. Specifically, the present invention relates to a new type of non-interface perfluorinated ion-exchange fused membrane with a specific multilayer structure, which contains both carboxylic acid groups and sulfonic acid groups, and is used as a diaphragm for aqueous solutions of water, acids and salts. , higher current efficiency and lower resistance can be obtained, and high-quality products can be produced for a longer period of use. Background technique [0002] As a process for electrolyzing alkali metal chlorides to produce alkali metal hydroxides and chlorine gas, the ionic membrane method is more and more widely used. Compared with the traditional mercury method and diaphragm, the ionic membrane method has all the advantages of both. Moreover, the energy consumption is lower, the product purity is higher, the operation is ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B1/46
Inventor 张永明张建宏刘传奇张恒刘燕刚栾英豪
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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