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Ultrathin perfluorosulfonic acid ion exchange membrane for alkali metal chloride electrolysis, and preparation method thereof

A technology of perfluorosulfonic acid ions and alkali metal chlorides, applied in the field of ion exchange membranes, can solve the problems of increasing membrane resistance, not conducting ions, hindering ion transmission paths, etc., achieving low membrane resistance, simple and reasonable process, and improved resistance. The effect of foaming properties

Active 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

In order to achieve sufficient roughness, the coating volume needs to contain 40-90% inorganic oxide particles or fluorine-containing resin particles as fillers, but the inorganic oxide particles or fluorine-containing resin particles themselves do not have the function of conducting ions
A large number of inorganic oxide particles and fluorine-containing resin particles without ion conductivity hinder the ion transmission path and increase the membrane resistance

Method used

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  • Ultrathin perfluorosulfonic acid ion exchange membrane for alkali metal chloride electrolysis, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of the ultra-thin perfluorosulfonic acid ion-exchange membrane for the electrolysis of alkali metal chlorides comprises the following steps:

[0031] (1) Add the perfluorosulfonic acid resin of IEC=1.08mmol / g into the mixed solution of ethanol and isopropanol according to the weight ratio of 1:1 to prepare a 10wt% perfluorosulfonic acid resin solution, and then 5 μm thick Soak the polytetrafluoroethylene porous non-woven membrane in the ultrasonically treated trifluorotrichloroethane solvent for 1.5 hours, take it out and dry it, fix the porous non-woven membrane on the simple frame prepared in advance, spray the perfluorinated The sulfonic acid resin solution is coated on both sides of the porous non-woven membrane, and after drying and molding, a perfluorosulfonic acid ion exchange membrane precursor with a perfluorosulfonic acid resin layer thickness of 10 μm is formed;

[0032] (2) under the temperature of 180 ℃, under the pressure of 120 tons...

Embodiment 2

[0047] The preparation method of the ultra-thin perfluorosulfonic acid ion-exchange membrane for the electrolysis of alkali metal chlorides comprises the following steps:

[0048] (1) Add the perfluorosulfonic acid resin of IEC=0.7mmol / g to the mixed solution of ethanol and isopropanol according to the weight ratio of 1:1 to prepare a 10wt% perfluorosulfonic acid resin solution, and then 5 μm thick Soak the polytetrafluoroethylene porous non-woven membrane in the ultrasonically treated trifluorotrichloroethane solvent for 1.5 hours, take it out and dry it, fix the porous non-woven membrane on the simple frame prepared in advance, spray the perfluorinated The sulfonic acid resin solution is coated on both sides of the porous non-woven membrane, and after drying and molding, a perfluorosulfonic acid ion exchange membrane precursor with a perfluorosulfonic acid resin layer thickness of 80 μm is formed;

[0049] (2) under the temperature of 180 ℃, under the pressure of 120 tons, t...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to an ultrathin perfluorosulfonic acid ion exchange membrane for alkali metal chloride electrolysis, and a preparation method thereof. The ultrathin 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, and a porous non-woven polymer layer is embedded inthe perfluorosulfonic acid polymer layer. According to the invention, an ultrathin porous non-woven polymer is used as a reinforcing material, so that the membrane has good mechanical properties andlow membrane resistance; by adopting a perfluorosulfonic acid polymer with ion conduction function, the surface roughness of the membrane can be improved so as to improve the anti-foaming performanceof the membrane, so that the membrane is suitable for running in a zero-polar-distance electrolytic cell under a novel high-current-density condition, and the cell voltage can be remarkably reduced; and the preparation method provided by the invention is simple and reasonable in process and easy for industrial production.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, and in particular relates to an ultra-thin perfluorosulfonic acid ion exchange membrane for electrolysis of alkali metal chlorides and a preparation method thereof. Background technique [0002] Due to their excellent permselectivity, ion exchange membranes 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. Ion-exchange membranes are known as the "chip" of electrolysis, so the development of lower power consumption and more durable ion-exchange membranes ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/46C25B13/08C25B13/02C08J5/22
CPCC08J5/2293C08J2300/102C08J2327/18C25B1/46C25B13/02C25B13/08
Inventor 张永明张恒刘烽李虹王丽张苗苗雷建龙
Owner SHANDONG DONGYUE POLYMER MATERIAL
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