Ultrathin perfluorocarboxylate ion exchange membrane with rough coating and preparation method thereof

A technology of perfluorocarboxylic acid ions and perfluorocarboxylic acid, which is applied in the field of ion exchange membranes, can solve the problems of increasing membrane resistance, hindering ion transmission paths, and not conducting ions, etc., achieves low membrane resistance, simple and reasonable process, and improves membrane efficiency. Effect of Surface Roughness

Active Publication Date: 2021-07-09
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 perfluorocarboxylate ion exchange membrane with rough coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Ultrathin perfluorocarboxylic acid ion-exchange membranes with rough coatings were prepared as follows:

[0043] (1) Dissolve the perfluorocarboxylic acid resin of IEC=1.08mmol / g in a solvent made of ethanol and isopropanol in a weight ratio of 1:1 to form a perfluorocarboxylic acid resin solution, and then 8 μm thick poly The tetrafluoroethylene porous non-woven membrane was treated in the ultrasonically treated trifluorotrichloroethane solvent for 1.5h, and after it was taken out and dried, the perfluorocarboxylic acid resin solution was coated on the upper and lower surfaces of the polytetrafluoroethylene porous non-woven membrane. The total thickness of the cloth is 20 μm, and finally dried 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 overpre...

Embodiment 2

[0061] Ultrathin perfluorocarboxylic acid ion-exchange membranes with rough coatings were prepared as follows:

[0062] (1) Dissolve the perfluorocarboxylic acid resin of IEC=1.3mmol / g in a solvent made of ethanol and isopropanol in a weight ratio of 1:1 to form a perfluorocarboxylic acid resin solution, and then 40 μm thick poly The tetrafluoroethylene porous non-woven membrane was treated in the ultrasonically treated trifluorotrichloroethane solvent for 1.5h, and after it was taken out and dried, the perfluorocarboxylic acid resin solution was coated on the upper and lower surfaces of the polytetrafluoroethylene porous non-woven membrane. The total thickness of the cloth is 70 μm, and finally dried to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0063] (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 overpr...

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Abstract

The invention belongs to the technical field of ion exchange membranes, in particular to an ultra-thin perfluorocarboxylic acid ion exchange membrane with a rough coating and a preparation method thereof. The ultra-thin perfluorocarboxylic acid ion exchange membrane with rough coating of the present invention is composed of a perfluorocarboxylic acid polymer layer, a porous non-woven polymer layer and a functional surface coating, wherein the functional surface coating is located on the perfluorinated The upper and lower surfaces of the carboxylic acid polymer layer, the porous non-woven polymer layer is embedded in the perfluorocarboxylic acid polymer layer; the thickness of the perfluorocarboxylic acid polymer layer is 10-80 μm; the functional surface coating is made of perfluorinated ion A porous rough structure composed of a mixture of polymers and metal oxides. The ultra-thin perfluorocarboxylic acid ion-exchange membrane with a rough coating of the present invention can effectively reduce the cell voltage, reduce electrolysis energy consumption, and reduce production costs in a zero-pole-distance electrolytic cell under novel high current density conditions; the present invention Also provided are methods for their preparation.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, in particular to an ultra-thin perfluorocarboxylic acid ion exchange membrane with a rough coating and a preparation method thereof. Background technique [0002] Ion exchange membrane is a thin film made of polymer material with ion exchange performance. It is similar to ion exchange resins, both of which connect an active group to the polymer skeleton, but the mechanism, mode and effect of action are different. [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, it is widely used in the electrolysis of potassium chloride to produce potassium carbonate, sodium chloride to produce sodium carbonate, sodium chloride to produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B13/02D06N3/04
CPCC25B13/02C25B13/08D06N3/0011D06N3/0088D06N3/047
Inventor 张永明张江山冯威张恒陈静王丽雷建龙张志浩
Owner SHANDONG DONGYUE POLYMER MATERIAL
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