Reinforced low-resistance chlor-alkali perfluorinated ion exchange membrane and preparation method thereof

A perfluorinated ion and exchange membrane technology, applied in the field of ion exchange membranes, can solve the problems of perfluorinated resin particles falling off easily, difficult to mass-produce, expensive manufacturing cost, etc. The effect of adhesion

Inactive Publication Date: 2020-04-21
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Polymer materials have good toughness, and breaking them into nano-scale sizes requires low-temperature crushing technology. The manufacturing cost is very expensive and it is difficult to mass produce
4. Perfluorosulfonic acid resin is an ion exchange resin, and its deformation size will change greatly in different temperatures and solution environments. The working conditions are more complicated during the electrolysis process, and the perfluororesin particles are easy to fall off.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Perfluorosulfonic acid resin with IEC=1.08mmol / g and perfluorocarboxylic acid resin with IEC=0.98mmol / g are combined into perfluoroion exchange resin base membrane by co-extrusion casting, wherein perfluorosulfonic acid resin The thickness of the acid resin layer is 100 microns, and the thickness of the perfluorocarboxylic acid resin layer is 10 microns. Then soak the porous reinforcing material compositely woven with polytetrafluoroethylene and silk into the ultrasonically treated trifluorotrichloroethane solvent for 1.5 hours, wherein the porous reinforcing material has a thickness of 50 microns and a porosity of 85%. Take it out after drying Then compound with perfluorinated ion exchange resin base membrane to form perfluorinated ion exchange membrane precursor.

[0048] (2) under the temperature of 180 ℃, under the pressure of 120 tons, the perfluorinated ion-exchange membrane precursor that makes in the step (1) uses superpressure machine to carry out superpres...

Embodiment 2

[0063] (1) The perfluorosulfonic acid resin of IEC=0.93mmol / g and the perfluorocarboxylic acid resin of IEC=0.95mmol / g are combined into a perfluoroion exchange resin base membrane by co-extrusion casting, wherein the perfluorosulfonic acid resin The thickness of the acid resin layer is 80 microns, and the thickness of the perfluorocarboxylic acid resin layer is 7 microns. Then soak the porous reinforcing material of polytetrafluoroethylene and wool composite weaving in the ultrasonically treated trifluorotrichloroethane solvent for 3 hours, wherein the porous reinforcing material has a thickness of 50 microns and a porosity of 85%. Take it out and dry it Then compound with perfluorinated ion exchange resin base membrane to form perfluorinated ion exchange membrane precursor.

[0064] (2) under the temperature of 200 ℃, under the pressure of 100 tons, with the perfluorinated ion exchange membrane precursor that makes in the step (1), carry out overpressure treatment with the s...

Embodiment 3

[0076] (1) Perfluorosulfonic acid resin with IEC=1.3mmol / g and perfluorocarboxylic acid resin with IEC=1.22mmol / g are combined into perfluoroion exchange resin base membrane by co-extrusion casting, wherein perfluorosulfonic acid resin The thickness of the acid resin layer is 120 microns, and the thickness of the perfluorocarboxylic acid resin layer is 12 microns. Then soak the porous reinforcing material compositely woven with polytetrafluoroethylene and casein fibers into the ultrasonically treated trifluorotrichloroethane solvent for 3 hours, wherein the porous reinforcing material has a thickness of 50 microns and a porosity of 85%. After drying, it is combined with a perfluorinated ion exchange resin base membrane to form a perfluorinated ion exchange membrane precursor.

[0077] (2) under the temperature of 190 ℃, under the pressure of 100 tons, with the perfluorinated ion exchange membrane precursor that makes in the step (1), carry out overpressure treatment with the s...

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Abstract

The invention relates to a reinforced low-resistance chlor-alkali perfluorinated ion exchange membrane and a preparation method thereof, and belongs to the technical field of ion exchange membranes. The ion exchange membrane comprises a base membrane, wherein functional surface coatings are arranged on the two surfaces of the base membrane, the base membrane is composed of a perfluorosulfonic acidpolymer layer and a perfluorocarboxylic acid polymer layer, a reinforcing material net is arranged in the perfluorosulfonic acid polymer layer, a hollow tunnel is arranged in the perfluorosulfonic acid polymer layer, and the functional surface coating is of a porous rough structure formed by a mixture of a perfluorinated ionic polymer and a metal oxide. According to the ion exchange membrane of the invention, the resistance of the membrane body is reduced, rapid conduction of ions is facilitated, the adhesive force of the surface of the membrane to bubbles is reduced, the effective electrolysis area of the surface of the membrane is increased, the local polarization phenomenon is reduced, the membrane is suitable for running in a zero-polar-distance electrolytic cell under a novel high-current-density condition, the cell voltage can be remarkably reduced, and the energy consumption is reduced. The invention also provides a simple and feasible preparation method.

Description

technical field [0001] The invention relates to a reinforced low-resistance chlor-alkali perfluorinated ion-exchange membrane and a preparation method thereof, belonging to the technical field of ion-exchange membranes. Background technique [0002] Ion-exchange membrane is a polymer membrane containing ionic groups and has the ability to selectively permeate ions in the solution. Because its ion selective permeability is generally used in application, it is also called ion selective permeability membrane. In 1950, W. Zhu Da first synthesized the ion exchange membrane. In 1956, it was successfully used in the electrodialysis desalination process for the first time. [0003] 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...

Claims

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Application Information

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IPC IPC(8): C25B1/46C25B13/08C25B13/02C08J5/22
CPCC08J5/2293C08J2300/102C08J2327/18C08J2389/00C08J2400/102C25B1/46C25B13/02C25B13/08
Inventor 张永明雷建龙刘烽戴琼薛帅杨淼坤屈凌波
Owner SHANDONG DONGYUE POLYMER MATERIAL
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