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Reinforced perfluorosulfonic acid ion exchange membrane for chloride electrolysis, and preparation method thereof

A perfluorosulfonic acid ion and perfluorosulfonic acid technology, applied in the field of ion exchange membranes, can solve the problems of affecting the ion exchange capacity of the basement membrane, increasing the resistance of the basement membrane, and low exchange capacity, so as to achieve easy industrial production and low membrane resistance , Improve the effect of roughness

Inactive Publication Date: 2020-05-22
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, perfluorosulfonic acid ion exchange membranes have the problems of high exchange capacity but low mechanical strength, high mechanical strength and low exchange capacity
Moreover, in practical applications, the requirements for the mechanical strength and service life of the diaphragm are quite high, and the existing perfluorosulfonic acid ion exchange membranes cannot meet the requirements.
[0005] In CN102024928A, polytetrafluoroethylene mesh cloth is used as a reinforcing material to increase the mechanical strength of the base film, but the reinforcing material will inevitably increase the resistance of the base film and affect the ion exchange capacity of the base film

Method used

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  • Reinforced perfluorosulfonic acid ion exchange membrane for chloride electrolysis, and preparation method thereof

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Effect test

Embodiment 1

[0033] The preparation method of the described reinforced perfluorosulfonic acid ion exchange membrane for chloride electrolysis comprises the following steps:

[0034] (1) The perfluoroion exchange resin base film is obtained by extrusion casting of perfluorosulfonic acid resin of IEC=1.08mmol / g, wherein the thickness of the perfluorosulfonic acid resin layer is 100 μm, and polytetrafluoroethylene and silk The composite braided reinforcing material net was soaked in ultrasonically treated trifluorotrichloroethane solvent for 1.5 hours, the thickness of the porous reinforcing material was 50 μm, the volume ratio of polytetrafluoroethylene and silk was 1:1, and the porosity of the reinforcing material net 30%, take it out and dry it, and then compound it with the perfluoroion exchange resin base membrane by rolling to form the precursor of the perfluorosulfonic acid ion exchange membrane;

[0035] (2) under the temperature of 180 ℃, under the pressure of 120 tons, the perfluori...

Embodiment 2

[0050] The preparation method of the described reinforced perfluorosulfonic acid ion exchange membrane for chloride electrolysis comprises the following steps:

[0051] (1) The perfluoroion exchange resin base film is obtained by extrusion casting of perfluorosulfonic acid resin of IEC=0.75mmol / g, wherein the thickness of the perfluorosulfonic acid resin layer is 250 μm, and polytetrafluoroethylene and silk The composite braided reinforcing material net was soaked in ultrasonically treated trifluorotrichloroethane solvent for 1.5 hours. The thickness of the porous reinforcing material was 100 μm, the volume ratio of polytetrafluoroethylene and silk was 1:2, and the porosity of the reinforcing material net 20%, take it out and dry it, and then compound it with the perfluoroion exchange resin base membrane by rolling to form the precursor of the perfluorosulfonic acid ion exchange membrane;

[0052] (2) under the temperature of 210 ℃, under the pressure of 100 tons, with the per...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a reinforced perfluorosulfonic acid ion exchange membrane for chloride electrolysis, and a preparation method thereof. The perfluorosulfonic acid ion exchange membrane comprises a perfluorosulfonic acid polymer layer, wherein the surface of the perfluorosulfonic acid polymer layer is coated with a functional surface coating, the functional surface coating is composed of a perfluoropolymer and has a porous rough structure, a reinforcing material layer is embedded in the perfluorosulfonic acid polymer layer, and the reinforcing material layer is provided with a hollow tunnel structure. According to the invention, a perfluoropolymer reinforcing net is added in a perfluorosulfonic acid base membrane while a hollow tunnel is prepared in the membrane, so that the membrane has good mechanical property and low film resistance; a perfluorinated ionic polymer with ion conduction function is adopted to replace the perfluorinated sulfonic acid coating containing the metal oxide in the existing product, and the formed porous channel can improve the surface roughness of the membrane so as to improve the anti-foaming performance of the membrane.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, and in particular relates to a reinforced perfluorosulfonic acid ion exchange membrane for chloride electrolysis and a preparation method thereof. Background technique [0002] Ion exchange membranes have excellent permselectivity and have been widely used in electrolytic oxidation and reduction operations. 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. As a high-energy-consuming industry, the electrolysis industry has always been the direction of everyone's efforts to develop electrolysis technology with lower power consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46C25B1/14C25B1/16C25B1/22C08J5/22
CPCC08J5/2293C08J2300/102C08J2400/102C25B1/14C25B1/16C25B1/22C25B1/46C25B13/02C25B13/08
Inventor 张永明戴琼赵彬李晓张振裴素朋雷建龙
Owner SHANDONG DONGYUE POLYMER MATERIAL
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