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Ultra-thin perfluorocarboxylic acid ion-exchange membrane with bubble-repelling function and preparation method thereof

A technology of perfluorocarboxylic acid ions and perfluorocarboxylic acid, which is applied in the field of ion exchange membranes, can solve the problems of poor bubble repelling effect on the surface of ion exchange membranes, easy adhesion of bubbles, and low current efficiency, so as to improve the electrolysis current Efficiency, improved anti-foaming performance, low film resistance effect

Active Publication Date: 2021-07-13
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of the ion-exchange membrane has a poor air-repellent effect, and the bubbles generated during the electrolysis process are easily adhered to the surface of the membrane and difficult to release, resulting in low current efficiency.

Method used

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  • Ultra-thin perfluorocarboxylic acid ion-exchange membrane with bubble-repelling function and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare the ultra-thin perfluorocarboxylic acid ion-exchange membrane with bubble-repelling function as follows:

[0041] (1) Dissolve the perfluorocarboxylic acid resin of IEC=0.8mmol / g in a solvent made of ethanol and isopropanol in a weight ratio of 1:1 to form a perfluorocarboxylic acid resin solution, and then 5 μm thick poly The tetrafluoroethylene porous non-woven membrane was treated in the ultrasonically treated trifluorotrichloroethane solvent for 1.5h, and after it was taken out and dried, the perfluorocarboxylic acid resin solution was coated on the upper and lower surfaces of the polytetrafluoroethylene porous non-woven membrane. The total thickness of the cloth is 10 μm, and finally dried to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0042] (2) Under 180°C and 120t pressure, the perfluorocarboxylic acid ion exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. After th...

Embodiment 2

[0059] Prepare the ultra-thin perfluorocarboxylic acid ion-exchange membrane with bubble-repelling function as follows:

[0060] (1) Dissolve the perfluorocarboxylic acid resin of IEC=1.2mmol / g in a solvent made of ethanol and isopropanol in a weight ratio of 1:1 to form a perfluorocarboxylic acid resin solution, and then put a 50 μm thick poly The tetrafluoroethylene porous non-woven membrane was treated in the ultrasonically treated trifluorotrichloroethane solvent for 1.5h, and after it was taken out and dried, the perfluorocarboxylic acid resin solution was coated on the upper and lower surfaces of the polytetrafluoroethylene porous non-woven membrane. The total thickness of the cloth is 80 μm, and finally dried to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0061] (2) Under 180°C and 120t pressure, the perfluorocarboxylic acid ion exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. A...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and in particular relates to an ultra-thin perfluorocarboxylic acid ion exchange membrane with the function of deflecting air bubbles and a preparation method thereof. The ultra-thin perfluorocarboxylic acid ion exchange membrane with air-repelling function is composed of a perfluorocarboxylic acid polymer layer, a porous non-woven polymer layer and a functional surface coating, wherein the functional surface coating is located on the surface of the perfluorocarboxylic acid On the upper and lower surfaces of the polymer layer, the porous non-woven polymer layer is embedded in the perfluorocarboxylic acid polymer layer; the functional surface coating is a porous rough structure composed of perfluorinated ion polymer. The ultra-thin perfluorocarboxylic acid ion-exchange membrane with bubble-repelling function of the present invention can effectively reduce the voltage of the cell, reduce the energy consumption of electrolysis, and reduce the production cost in the zero-pole pitch electrolytic cell under the new high current density condition; the present invention Also provided are methods for their preparation.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, and in particular relates to an ultra-thin perfluorocarboxylic acid ion exchange membrane with the function of deflecting air bubbles and a preparation method thereof. Background technique [0002] The ion exchange membrane is a polymer membrane containing ionic groups and has the ability to selectively permeate the ions in the solution. Because its ion selective permeability is generally used in application, it is also called ion selective permeability membrane. [0003] Ion-exchange membranes can be assembled into electrodialyzers for desalination of brackish water and concentration of salt solutions, and can also be used for desalination of glycerin and polyethylene glycol, separation of various ions and radioactive elements, isotopes, and fractionation of amino acids Wait. In addition, ion exchange membranes are also used in the purification of organic and inorganic compounds...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/02C25B13/08
Inventor 张永明刘烽张恒李志勇张波赵彬雷建龙
Owner SHANDONG DONGYUE POLYMER MATERIAL
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