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Perfluoro ion exchange solvation reinfercing film and its preparation method

A technology of perfluorinated ions and perfluorosulfonic acid ions, applied in the direction of organic diaphragms, electrolytic processes, electrolytic components, etc., can solve problems such as delamination, affecting service life, and not reaching the molecular level, so as to improve service life and combine perfect Effect

Inactive Publication Date: 2005-06-08
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 film, the different exchange capacities, and the differences in the types of exchange groups lead to different water absorption and expansion rates between the layers, the film is formed by melt extrusion. At the same time, the physical interface between the layers has great defects, which is far from the combination at the molecular level, resulting in frequent cracking, delamination, and air bubbles in use, which need to be repaired or replaced, seriously affecting the service life
Unreinforced ion-exchange membranes are extremely susceptible to damage and are not dimensionally stable when the electrolyte concentration changes

Method used

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  • Perfluoro ion exchange solvation reinfercing film and its preparation method
  • Perfluoro ion exchange solvation reinfercing film and its preparation method
  • Perfluoro ion exchange solvation reinfercing film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] with tetrafluoroethylene and

[0063] Wherein m=0-3, n=2 or 3 copolymerize to obtain perfluorosulfonic acid resin, the IEC value of this kind of resin is 1.18mmol / g, after resin is converted into Na type, be dissolved in dimethyl sulfoxide, then put The solution is concentrated to 18%, and polytetrafluoroethylene reinforced microfibers with a resin weight of 5% are added, the length of the microfibers is 0.05-30 μm, and the diameter is 0.02-50 μm. Apply the obtained slurry on release paper and dry at 170°C for 1.5 minutes to obtain the first ion exchange layer with a thickness of 45 μm;

[0064] The perfluorosulfonic acid resin with an IEC value of 1.05 mmol / g was converted into Na form and dissolved in dimethyl sulfoxide, and then the solution was concentrated to 18% for the second ion exchange layer.

[0065] Spread polytetrafluoroethylene mesh cloth on the first ion exchange layer, the mesh cloth is interwoven, the warp direction fiber fineness is 200 denier, the ...

Embodiment 2

[0071] with tetrafluoroethylene and

[0072] Wherein m=0-3, n=2 or 3 copolymerize to obtain perfluorosulfonic acid resin, the IEC value of this kind of resin is 0.98mmol / g, after resin is converted into K type, be dissolved in N-methylpyrrolidone, then put The solution was concentrated to 15%, and the obtained solution was coated on the ceramic mold, dried at 160°C for 2 minutes, and repeated to obtain the first ion exchange layer with a thickness of about 60 μm;

[0073] with tetrafluoroethylene and

[0074]

[0075] m=0~3, n=2~3

[0076] Copolymerize to obtain perfluorocarboxylic acid resin, the IEC value of this kind of resin is 1.22mmol / g, after converting the resin into K type, it is dissolved in N-methylpyrrolidone, and then the solution is concentrated to a concentration of 10%.

[0077] Mix the perfluorosulfonic acid resin solution obtained above with the perfluorocarboxylic acid resin solution at a ratio of 50:50, then add polytetrafluoroethylene reinforced mic...

Embodiment 3

[0081] with tetrafluoroethylene and

[0082] Where m=0-3, n=2 or 3

[0083] Copolymerize to obtain perfluorosulfonic acid resin, the IEC value of this kind of resin is 0.96mmol / g, the resin is converted into acid form and dissolved in propylene glycol, then the solution is concentrated to 16%, and the obtained solution is coated on the glass mold , dried at 150° C. for 1 minute to obtain the first ion exchange layer with a thickness of about 20 μm;

[0084] Copolymerize to obtain the perfluorosulfonic acid resin with IEC value of 0.99mmol / g, dissolve the resin in ethylene glycol after converting the resin into acid form, concentrate the solution to 15%, and then add 10% polytetrafluoroethylene by resin weight to strengthen Microfibers, the length of microfibers is 0.05-30μm, and the diameter is 0.02-50μm. Mix the materials evenly and apply directly on the first ion exchange layer, dry at 170°C for 5 minutes, repeat, and the last drying time is 1.5 minutes. A thickness of a...

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Abstract

A reinforced perfluoro ion exchange film is composed of at least two layers of ionic film, which prepared from perfluoro ion exchange resin and fused together without interface, at least one layer of perfluoro polymer mesh as reinforcing material and the perfluoro polymer microfibres added to said filming resin. It is prepared through sequential coating. Its advantages are low film resistance, high electric current efficiency, and high mechanical strength and size 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 the electrolysis of water, acid and salt solutions , can get higher current efficiency and lower resistance, and can produce high-quality products in a long service time. 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, an...

Claims

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Application Information

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