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Perfluorinated ion exchange casting enhancement member and preparing method thereof

A perfluorinated ion and ion exchange technology, applied in the direction of organic diaphragm, electrolytic process, electrolytic components, etc., can solve the problems of difficult processing, easy deformation and high price of polytetrafluoroethylene mesh

Inactive Publication Date: 2007-10-17
SHANDONG DONGYUE POLYMER MATERIAL
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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 layers in this membrane, the exchange capacity is different, and the difference in the type of exchange groups leads to different water absorption and expansion rates between the layers, there is a gap between the layers. The sudden change in the physical interface has great defects, far from reaching the molecular level combination, resulting in frequent cracking and delamination during use and the need for repair or replacement, which seriously affects the service life
Patent CN200310119330.4 introduces the preparation method of perfluorinated ion fusion enhanced membrane, which can produce composite membrane with excellent performance, but polytetrafluoroethylene mesh cloth is difficult to process, expensive, and easy to deform. It is difficult to control the flatness of the mesh itself, which brings certain difficulties to the processing technology
However, the unreinforced ion exchange membrane is extremely easy to damage, and the size of the membrane is unstable when the electrolyte concentration changes.

Method used

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  • Perfluorinated ion exchange casting enhancement member and preparing method thereof
  • Perfluorinated ion exchange casting enhancement member and preparing method thereof
  • Perfluorinated ion exchange casting enhancement member and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The perfluorosulfonic acid resin with the IEC value of 0.95meq / g is converted into the H type and dissolved in N, N-dimethylformamide, then the solution is concentrated to 15%, and the polytetrafluoroethylene biaxially stretched film ( Thickness 50 μm, average pore diameter 1 μm) Boil in methanol for 2 hours and then dry, then dip in the solution obtained above, and dry at 170 ° C for 5 minutes to obtain the first ion exchange layer with a thickness of 55 μm;

[0058] Convert the perfluorosulfonic acid resin with an IEC value of 1.15meq / g into H-type and dissolve it in N,N-dimethylformamide, then concentrate the solution to 30%, and scrape-coat it on the first ion-exchange layer The surface was dried at 170° C. for 10 minutes to obtain a second ion exchange layer with a thickness of 145 μm.

[0059] Convert the perfluorocarboxylic acid resin with an IEC value of 1.25meq / g into H-type and dissolve it in N,N-dimethylformamide, then concentrate the solution to a concentrat...

Embodiment 2

[0062] The perfluorosulfonic acid resin that the IEC value is 0.98meq / g is converted into K type and dissolved in dimethyl sulfoxide, then the solution is concentrated to 20%, and the polytetrafluoroethylene biaxially stretched film (thickness 50 μm, average pore size 2 μm) was boiled in methanol for 2 hours and dried, then immersed in the solution obtained above, and dried at 180° C. for 5 minutes to obtain the first ion exchange layer with a thickness of 60 μm.

[0063] The perfluorocarboxylic acid resin with an IEC value of 1.22meq / g was converted into H-form and dissolved in dimethyl sulfoxide, and then the solution was concentrated to a concentration of 25%.

[0064] Mix the perfluorosulfonic acid resin solution and the perfluorocarboxylic acid resin solution obtained above in a ratio of 50:50, mix the solution evenly and apply it on one side of the film obtained above, and dry it at 180°C for 5 minutes to obtain a thickness The second ion exchange layer is 102μm.

[006...

Embodiment 3

[0068] The perfluorosulfonic acid resin with IEC value of 0.95meq / g is converted into H type and dissolved in propylene glycol, then the solution is concentrated to 16%, and polytetrafluoroethylene biaxially stretched film (thickness 50 μm, average pore size 2 μm) in It was boiled in methanol for 2 hours, dried, then immersed in the solution obtained above, and dried at 200° C. for 4 minutes to obtain the first ion exchange layer with a thickness of 61 μm.

[0069] Convert the perfluorosulfonic acid resin with an IEC value of 1.20meq / g into H-type, dissolve it in ethylene glycol, concentrate the solution to 25%, scrape-coat it on the surface of the first ion-exchange layer, and dry it at 200°C After 3 minutes, the thickness of the second ionic layer was obtained to be 32 μm.

[0070] The copolymerization type perfluorinated ion exchange resin (IEC=0.98meq / g, wherein the quantity ratio of sulfonic acid group and carboxylic acid group is 70:30) containing sulfonic acid group and...

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Abstract

A perfluorinated ion exchange membrane fusing-casting reinforced film includes reinforced substrate and ion change layer. Said reinforced substrate is a perfluorinated polymer biaxially oriented film. Said ion change layer is formed by solution casting method, having the perfluorinated ion exchange resin containing sulfonic acid group and / or carboxylic acid group as film forming resin. The film without abrupt interface between the ion exchange layers is formed by the means of solution casting and program coating so as to make the ion exchange group concentration between the ion exchange layers and different ion exchange layers achieve molecule horizontal combination and greatly improve the interface compatibility. The ion exchange membrane has a lower film resistor, a higher current efficiency, a high film planeness, extremely good mechanical strength and dimensional stability. The invention also provides producing method thereof.

Description

technical field [0001] The invention belongs to the field of fluorine-containing functional materials, and relates to a perfluorinated ion exchange membrane and a preparation method thereof. Specifically, the invention relates to a perfluorinated ion-exchange membrane with a specific multiple ion-exchange layer structure and no abrupt interface, and the membrane contains both carboxylic acid groups and sulfonic acid groups. 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 easier, and there is no pollution. The ion exchange membrane used in this process requires high chemical stability, high current efficiency, low membrane resis...

Claims

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Application Information

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IPC IPC(8): C08J5/22C25B1/46C25B13/08
Inventor 张永明张恒裴素朋栾英豪高洪光
Owner SHANDONG DONGYUE POLYMER MATERIAL
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