Perfluorocarboxylic acid ion exchange membrane with rough coating and method for its preparation

A perfluorocarboxylic acid ion and rough coating technology, which is applied in the field of ion exchange membranes, can solve the problems of small roughness of the gas release layer, inability to effectively reduce the cell voltage, and poor bubble-repelling performance, so as to improve the surface roughness of the membrane, Effect of improving electrolytic current efficiency and improving anti-foaming performance

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

However, the roughness of the gas release layer is small, and the air bubble performance is poor, which cannot effectively reduce the cell voltage and reduce the energy consumption of electrolysis

Method used

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  • Perfluorocarboxylic acid ion exchange membrane with rough coating and method for its preparation

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Embodiment 1

[0041] A perfluorocarboxylic acid ion exchange membrane with a rough coating was prepared as follows:

[0042] (1) Extrude and cast the perfluorocarboxylic acid resin of IEC=0.8mmol / g to obtain a perfluorocarboxylic acid ion-exchange resin base film with a thickness of 50 μm to form a perfluorocarboxylic acid ion-exchange membrane precursor;

[0043] (2) Under the pressure of 180°C and 120t, the perfluorocarboxylic acid ion exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. After the overpressure treatment, it is then immersed in an alkaline solution of 85°C ( Containing 18wt% dimethyl sulfoxide, 20wt% NaOH aqueous solution) transformation in 80min, transforming into perfluorocarboxylic acid ion exchange membrane with ion exchange function;

[0044] (3) Add the perfluorosulfonic acid polymer with IEC=1.2mmol / g into the solvent made of ethanol and isopropanol in a weight ratio of 1:2, and treat it in a closed r...

Embodiment 2

[0060] A perfluorocarboxylic acid ion exchange membrane with a rough coating was prepared as follows:

[0061] (1) Extrude and cast the perfluorocarboxylic acid resin of IEC=1.36mmol / g to obtain a perfluorocarboxylic acid ion-exchange resin base film with a thickness of 250 μm to form a perfluorocarboxylic acid ion-exchange membrane precursor;

[0062] (2) Under 150°C and 100t 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 overpressure treatment, it is then immersed in an alkaline solution of 85°C ( Containing 15wt% dimethyl sulfoxide, 15wt% NaOH aqueous solution) in transformation 80min, transforms into the perfluorocarboxylic acid ion-exchange membrane with ion exchange function;

[0063] (3) Add the perfluorosulfonic acid polymer with IEC=1.2mmol / g into the solvent made of ethanol and isopropanol in a weight ratio of 1:1, and treat it in a closed reac...

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Abstract

The invention belongs to the technical field of ion exchange membranes, in particular to a perfluorocarboxylic acid ion exchange membrane with a rough coating and a preparation method thereof. The perfluorocarboxylic acid ion exchange membrane with rough coating of the present invention is composed of a perfluorocarboxylic acid polymer layer and a functional surface coating, wherein the functional surface coating is located on the upper and lower surfaces of the perfluorocarboxylic acid polymer layer; The thickness of the perfluorocarboxylic acid polymer layer is 50-250 μm, and the thickness of the functional surface coating is 10nm-30 μm; the functional surface coating is a porous rough structure composed of a mixture of perfluoroionic polymers and metal oxides. structure. The 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 pitch electrolytic cell under novel high current density conditions; the present invention also provides its preparation method.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, in particular to a perfluorocarboxylic acid ion exchange membrane with a rough coating 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 has always been the direction of everyone's ef...

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 张永明雷建龙冯威张恒宗少杰赵宽张振张志浩
Owner SHANDONG DONGYUE POLYMER MATERIAL
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