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Perfluorocarboxylic acid ion exchange membrane with bubble thinning function and preparation method thereof

A technology of perfluorocarboxylic acid ions and perfluorocarboxylic acid, applied in the field of ion exchange membranes, can solve problems such as low current efficiency, low roughness, and limited bubble release ability, and achieve lower cell voltage, simple and reasonable process, and improved resistance The effect of foaming properties

Inactive Publication Date: 2020-04-17
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above patents are coated with a gas-releasing coating on the two outer surfaces of the base film to release the bubbles generated during the electrolysis process. The gas-releasing coating is composed of perfluorosulfonic acid resin and inorganic oxide, and the inorganic oxide is preferably oxidized Zirconium, the gas release coating has fewer pores, lower roughness, and limited ability to release air bubbles. From its test performance, it can be seen that the cell voltage is still above 3V, and the current efficiency is also low

Method used

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  • Perfluorocarboxylic acid ion exchange membrane with bubble thinning function and preparation method thereof

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Embodiment 1

[0039] Prepare the ultra-thin perfluorocarboxylic acid ion-exchange membrane with bubble-repelling function as follows:

[0040] (1) Extrude and cast the perfluorocarboxylic acid resin of IEC=0.7mmol / g to obtain a perfluorocarboxylic acid ion-exchange resin base film with a thickness of 100 μm to form a perfluorocarboxylic acid ion-exchange membrane precursor;

[0041] (2) Under the pressure of 180°C and 120t, the perfluorocarboxylic acid ion exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. After the overpressure treatment, it is then immersed in an alkaline solution of 85°C ( Containing 18wt% dimethyl sulfoxide, 20wt% NaOH aqueous solution) in transformation 80min, transforms into the perfluorocarboxylic acid ion-exchange membrane with ion exchange function;

[0042] (3) Add the perfluorosulfonic acid polymer with IEC=1.2mmol / g into the solvent made of ethanol and isopropanol in a weight ratio of 1:1, and t...

Embodiment 2

[0058] Prepare perfluorocarboxylic acid ion-exchange membranes with air bubble function as follows:

[0059] (1) Extrude and cast the perfluorocarboxylic acid resin of IEC=1.2mmol / g to obtain a perfluorocarboxylic acid ion-exchange resin base film with a thickness of 180 μm to form a perfluorocarboxylic acid ion-exchange membrane precursor;

[0060] (2) Under 150°C and 100t pressure, the perfluorocarboxylic acid ion-exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. After the overpressure treatment, it is then immersed in an alkaline solution of 80°C ( Containing 15wt% dimethyl sulfoxide, 15wt% NaOH aqueous solution) in transformation 80min, transforms into the perfluorocarboxylic acid ion-exchange membrane with ion exchange function;

[0061] (3) Add the perfluorosulfonic acid polymer with IEC=1.2mmol / g into the solvent prepared by ethanol and isopropanol in a weight ratio of 1:1, and treat it in a closed rea...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a perfluorocarboxylic acid ion exchange membrane with a bubble thinning function and a preparation method of the perfluorocarboxylic acid ion exchange membrane. The perfluorocarboxylic acid ion exchange membrane with the bubble thinning function is composed of a perfluorocarboxylic acid polymer layer and functional surface coatings, wherein the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer; the thickness of the perfluorocarboxylic acid polymer layer is 50-250 [mu]m, and the thickness of each functional surface coatings is 10-30 [mu]m; and each functional surface coating is of a porous rough structure composedof a perfluorinated ionic polymer. The perfluorocarboxylic acid ion exchange membrane with the bubble thinning function has a small ion channel, can effectively prevent hydroxide radicals of a cathodefrom reversely migrating in the electrolysis process of sodium chloride, improves the efficiency of electrolysis current, and can effectively reduce cell voltage and electrolysis energy consumption in a novel zero-polar-distance electrolytic cell under the condition of high current density. The invention also provides the preparation method of the perfluorocarboxylic acid ion exchange membrane.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a perfluorocarboxylic acid ion-exchange membrane with a bubble-repelling function 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] The application of perfluorinated ion exchange membranes in the salt electrolysis industry has caused revolutionary changes in the chlor-alkali industry. In addition, it is widely used in the electrolysis of potassium chloride to produce potassium carbonate, sodium chloride to produce sodium carbonate, sodium chloride to produce sodium sulfite, and sodium sulfate to produce caustic soda and sulfuric acid. The cell voltage can be effec...

Claims

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Application Information

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IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/02C25B13/08
Inventor 张永明雷建龙张恒刘烽王振华王学军张志浩
Owner SHANDONG DONGYUE POLYMER MATERIAL
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