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Ion exchange membrane for electrolysis of oxygen cathode and preparation method thereof

An ion exchange membrane, oxygen cathode technology, applied in the direction of organic diaphragm, etc., can solve the problems of increasing cell voltage, reducing catalytic efficiency, increasing reaction resistance, etc., to achieve the effect of reducing cell voltage and improving catalytic efficiency

Active Publication Date: 2014-01-29
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, when the traditional chlor-alkali ion membrane is used in the oxygen cathode chlor-alkali process, there are some insurmountable defects: oxygen can only react on the surface of the catalytic electrode and the accessories of the cell, which increases the reaction resistance to a certain extent and improves the efficiency of the cell. voltage while reducing the catalytic efficiency

Method used

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  • Ion exchange membrane for electrolysis of oxygen cathode and preparation method thereof

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Effect test

Embodiment 1

[0035] (1) Preparation of resin pellets

[0036] The perfluorosulfonic acid resin is a powder obtained by in-situ polymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, and has an ion exchange capacity of 0.95 mmol / g. The powder obtained by copolymerization of tetrafluoroethylene and perfluoro-4,7-dioxa-5-methyl-8-nonenoate methyl ester has an ion exchange capacity of 0.95 mmol / g. The perfluorosulfonic acid resin powder and the perfluorocarboxylic acid resin powder are melt-extruded and granulated to obtain respective pellets.

[0037] (2) Membrane preparation and reinforcement

[0038] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid resin pellets, the perfluorinated ion exchange resin base film is prepared by a melt co-extrusion process; A reinforced ionic membrane is formed inside the resin base membrane;

[0039] (3) Membrane transformation and surface treatment

[0040] The ionic mem...

Embodiment 2

[0043] (1) Preparation of resin pellets

[0044] Perfluorosulfonic acid resin is a powder obtained by copolymerization of tetrafluoroethylene, hexafluoropropylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, with an ion exchange capacity of 0.98mmol / g The resin powder is melt-extruded and granulated to obtain pellets containing perfluorosulfonic acid resin. The powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5methyl-8-nonenoate methyl ester has an ion exchange capacity of 0.93mmol / g, and is granulated by melt extrusion to obtain perfluorocarboxylate Pellets of acid resin.

[0045] (2) Membrane preparation and reinforcement

[0046] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid resin pellets, respectively obtain perfluorocarboxylic acid and perfluorosulfonic acid ion exchange resin membranes by melt extrusion; The mesh is arranged inside the perfluorinated ion exchange resin base ...

Embodiment 3

[0051] Step (1), step (2) and step (3) are the same as in Example 1, except that the particle size distribution of the nano-silver powder in step (1) is 25-45 nm.

[0052] The ion-exchange membrane tensile strength that embodiment 3 prepares is 33MPa, can be used for the ion-exchange membrane in the chlor-alkali ion-exchange membrane electrolyzer, at 5.5kA / m 2 Under the conditions of current density of 32% by mass ratio of cathode NaOH solution, 305g / L brine concentration of anode brine entering the tank, 210g / L NaCl concentration of brine leaving the tank, tank temperature of 85-87°C, active cathode, and 1mm pole distance Test, the cell voltage is 2.24-2.31V, and the current efficiency is 96.7%. Example 4:

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Abstract

The invention belongs to the technical field of polymer materials and specifically relates to an ion exchange membrane for electrolysis of an oxygen cathode and a preparation method thereof. The ion exchange membrane for electrolysis of the oxygen cathode is a multi-layer composite membrane comprising a perfluorosulfonic acid ion exchange resin layer, a perfluorocarboxylic acid ion exchange resin layer, a reinforcing mesh fabric, a hydrophilic coating and a multifunctional coating, wherein the thickness of the perfluorosulfonic acid resin layer is 80-150 mu m, the thickness of the perfluorocarboxylic acid resin layer is 8-15 mu m, the hydrophilic coating with the thickness of 3-12 mu m is coated on the surface on the anode side of the membrane, and the multifunctional coating with the thickness of 3-12 mu m is coated on the surface on the cathode side of the membrane. The preparation method comprises the following steps: spraying the carboxylic acid side of the ion membrane after transformation by using a dispersion solution containing perfluorosulfonic acid resin, a catalyst and a lower alcohol and drying to form the multifunctional coating. According to the preparation method provided by the invention, the surface of the ion membrane is endowed with a catalytic structure and the function, oxygen is in full contact with the surface of the ion membrane, and reaction is performed on the surface, so that the cell voltage is reduced and the catalytic efficiency is simultaneously improved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an ion exchange membrane used for oxygen cathode electrolysis and a preparation method thereof. Background technique [0002] The chlor-alkali industry produces caustic soda and chlorine through electrolysis of brine, and at the same time produces hydrogen as a by-product. It is a basic chemical raw material industry that occupies an important position in the national economy. At present, the domestic caustic soda method is mainly the ion-exchange membrane method, and the electricity consumption cost accounts for about 60% of the production cost. Therefore, reducing electricity consumption is of great significance for improving the economic benefits of the chlor-alkali industry. Fundamentally speaking, the huge power consumption of the chlor-alkali industry is determined by its chemical reaction itself. Therefore, fundamentally changing the electrochemical ...

Claims

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Application Information

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IPC IPC(8): C25B13/08
Inventor 王学军王婧
Owner SHANDONG DONGYUE POLYMER MATERIAL
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