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

A perfluorocarboxylic acid ion and perfluorocarboxylic acid technology, applied in the field of ion exchange membranes, can solve the problems of ineffective reduction of cell voltage, foaming and peeling of the composite membrane layer, and large difference in ion migration number, etc., to improve electrolysis Current efficiency, improved anti-foaming performance, simple and reasonable process

Inactive Publication Date: 2020-05-08
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patents all use perfluorosulfonic acid ion exchange membrane and perfluorocarboxylic acid ion exchange membrane as the base membrane. During the electrolysis process, due to the large difference in the ion migration number of the two base membranes, and the water between the two base membranes The unbalanced permeation amount produces a large stress, which is easy to cause foaming and peeling of the composite film layer; in addition, the gas release layer has a small roughness and poor bubble-repelling performance, which cannot effectively reduce the cell voltage and reduce the energy consumption of electrolysis

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Prepare the enhanced perfluorocarboxylic acid ion exchange membrane with air bubble function as follows:

[0043] (1) The perfluorocarboxylic acid resin of IEC=0.8mmol / g is extruded and casted to obtain a perfluorocarboxylic acid ion exchange resin base film with a thickness of 100 μm, and then the polytetrafluoroethylene fiber and silk are according to the volume ratio of 1: 1 Composite braided porous reinforcement (thickness 50 μm, porosity 30%), soaked in ultrasonically treated trifluorotrichloroethane solvent for 1.5 h, taken out and dried, and mixed with perfluorocarboxylic acid ion exchange resin base The membrane is compounded to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0044] (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 the overpressure treatment, it is then immersed in an alkaline solution ...

Embodiment 2

[0061] Prepare the enhanced perfluorocarboxylic acid ion exchange membrane with air bubble function as follows:

[0062] (1) The perfluorocarboxylic acid resin of IEC=1.2mmol / g is extruded and casted to obtain a perfluorocarboxylic acid ion exchange resin base film with a thickness of 250 μm, and then the polytetrafluoroethylene fiber and silk are according to the volume ratio of 1: 2 Composite braided porous reinforcement (thickness 100μm, porosity 20%), soaked in ultrasonically treated trifluorotrichloroethane solvent for 1.5h, taken out and dried, and mixed with perfluorocarboxylic acid ion exchange resin matrix The membrane is compounded to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0063] (2) Under the pressure of 160°C and 100t, 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 s...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a reinforced perfluorocarboxylic acid ion exchange membrane with a bubble dredging function and a preparation method thereof. The reinforced perfluorocarboxylic acid ion exchange membrane with the bubble thinning function is composed of a perfluorocarboxylic acid polymer layer, a porous reinforcingmaterial layer and functional surface coatings, the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer, the porous reinforcing material layer is embedded in the perfluorocarboxylic acid polymer layer, and the functional surface coating is of a porous rough structure composed of a perfluorinated ionic polymer. The reinforced perfluorocarboxylic acid ion exchange membrane with the bubble thinning function can effectively reduce the cell voltage, reduce the electrolysis energy consumption and reduce the production costin a novel zero-polar-distance electrolytic cell under the condition of high current density, and is suitable for the field of electrolysis of sodium chloride and potassium chloride; the invention also provides a preparation method thereof.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a reinforced perfluorocarboxylic acid ion-exchange membrane with the function of deflecting air bubbles and a preparation method thereof. Background technique [0002] The ion exchange membrane currently used in chlor-alkali production is a multilayer composite membrane with an asymmetric structure. The side facing the cathode is a perfluorocarboxylic acid membrane. It has high selectivity and can effectively prevent or reduce the penetration of OH- to the anode. The reduction of the ionic membrane current is caused, so that the performance of the membrane current efficiency is guaranteed. However, it has low water content and high resistance, so it is relatively thin, and the thickness of the carboxylic acid layer is generally 35-80um. The side facing the anode has a thick perfluorosulfonic acid layer, generally 250-350um, which is the main undertaker...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46C08J5/22
CPCC08J5/2293C08J2300/102C25B1/46C25B13/02C25B13/08
Inventor 张永明刘烽张恒王振华雷建龙宗少杰孔亮
Owner SHANDONG DONGYUE POLYMER MATERIAL
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