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Reinforced low-resistance chlor-alkali electrolyzer diaphragm and preparation method thereof

A chlor-alkali electrolysis and diaphragm technology, applied in the field of ion exchange membranes, can solve the problems of perfluororesin particles falling off easily, difficulty in mass production, and high manufacturing cost, so as to increase the effective electrolysis area, facilitate industrial production, and reduce adhesion Effect

Active Publication Date: 2021-08-10
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

[0046] (1) Complex into a perfluoride exchange resin base film by co-extrusion casting by co-extrusion casting by co-extrusion casting in such a manifluofluorocarboxylic acid resin using IEC = 1.08 mmol / g of perfluorocarboxylic acid resin. The acid resin layer has a thickness of 90 microns, and the perfluorocarboxylic acid resin layer has a thickness of 7 microns. The polytetrafluoroethylene and silk composite braided porous reinforcing material were soaked to the ultrasonic treatment-treated trifluoridine solvent for 1.5 hours, in which the thickness of the porous reinforcing material was 80 microns, the void ratio was 85%, and the dried was removed. Then, composite with the full fluoride exchange resin base film to form a perfluoride exchange membrane precursor.

[0047] (2) Under the pressure of the full fluoride exchange membrane precursor obtained in step (1) at a temperature of 180 ° C, an overpressure is used at a pressure of 45 m / min at a temperature of 120 tons. After...

Embodiment 2

[0059] (1) Complex into a perfluoride exchange resin base film by co-extrusion casting by co-extrusion casting by co-extrusion casting in such a manifluofluorocarboxylic acid resin using IEC = 0.93 mmol / g of perfluorocarboxylic acid resin. The acid resin layer has a thickness of 100 microns, and the thickness of the perfluorocarboxylic acid resin layer is 8 microns. The polytetrafluoroethylene and wool composite woven porous reinforcing material were soaked to the ultrasonic treated trifluoroethylidene solvent for 3 hours, wherein the porous reinforcing material had a thickness of 70 microns and a void ratio of 85%, and the dried is removed. Then, composite with the full fluoride exchange resin base film to form a perfluoride exchange membrane precursor.

[0060] (2) Under the pressure of the full fluoride exchange membrane precursor obtained in step (1) at a temperature of 200 ° C, a superpressing machine is performed using an overpressure of 45 m / min at a pressure of 45 m / ...

Embodiment 3

[0072] (1) Composite into a perfluoride-exchange resin base film by co-extrusion casting by co-extrusion casting in such a manifluofluorocarboxylic acid resin using IEC = 1.3 mmol / g of perfluoroalkoxide resin and IEC = 1.22 mmol / g. The acid resin layer has a thickness of 250 microns and a total fluorocarboxylic acid resin layer having a thickness of 20 microns. The polytetrafluoroethylene and casein fiber composite woven porous reinforcing material were soaked to ultrasonic treatment of three-fluorine trichloroethane solvent for 3 hours, with a porous reinforcing material having a thickness of 180 microns and a void ratio of 85%, taken out After drying, it was compounded with the full fluoride exchange resin base film to form a perfluoride exchange membrane precursor.

[0073] (2) Under the temperature of the full fluoride exchange membrane precursor of step (1), at a temperature of from 190 ° C, at a pressure of 45 m / min, an overpressure is performed at a speed of 45 m / mi...

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Abstract

The invention relates to a reinforced low-resistance chlor-alkali electrolyzer diaphragm and a preparation method thereof, belonging to the technical field of ion exchange membranes. The diaphragm of the electrolytic cell according to the present invention comprises a base film, the two sides of the base film are provided with functional surface coatings, the base film is composed of a perfluorosulfonic acid polymer layer and a perfluorocarboxylic acid polymer layer, and the perfluorosulfonic acid polymer A reinforcing material net is arranged in the layer, and a hollow tunnel is arranged in the perfluorosulfonic acid polymer layer; the functional surface coating is a porous rough structure composed of a perfluoroionic polymer. The diaphragm of the electrolytic cell described in the present invention not only reduces the resistance of the membrane body, is conducive to the rapid conduction of ions, but also reduces the adhesion of the membrane surface to air bubbles, improves the effective electrolysis area of ​​the membrane surface, and reduces local polarization. phenomenon, suitable for operation in a zero-pole-distance electrolytic cell under novel high current density conditions, can significantly reduce cell voltage, and reduce energy consumption; the invention also provides a simple and easy preparation method.

Description

Technical field [0001] The present invention relates to an enhanced low-alkali-alkali electrolytic tank diaphragm and a preparation method thereof, belonging to the technical field of ion exchange membrane. Background technique [0002] The ion exchange membrane is an ionic group having a polymer film having an ion in the solution having a transmitting ability. Since it is generally used in the application, it is mainly used to select transmissivity, and it is also referred to as ion selective transmissive film. 1950 W. Zhu Da first synthesized an ion exchange membrane. In 1956, it was first successfully used in electrodialysis desalination process. [0003] Since the ion exchange membrane has excellent selection permeability, it has been widely used in electrolytic oxidation and reduction operations. The application of the whole fluoride exchange membrane in salt electrolytic industry has caused revolutionary changes in the chloride industry. Further, in the manufacture of sodiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/02C25B13/08
Inventor 张永明雷建龙薛帅刘烽王丽戴琼陈静屈凌波
Owner SHANDONG DONGYUE POLYMER MATERIAL
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