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Hole-containing fiber reinforced ion exchange membrane for chlor-alkali industry and preparation method thereof

An ion-exchange membrane and fiber-reinforced technology, applied in the direction of diaphragm, electrolysis process, electrolysis components, etc., can solve the problems of reducing the mechanical strength of the membrane and the decrease of membrane strength, and achieve the effects of avoiding textile conditions, reducing cell voltage, and reducing transfer resistance

Active Publication Date: 2013-04-03
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the electric cell runs smoothly, the sacrificial fibers will slowly dissolve and disappear, which will naturally reduce the resistance of the membrane, but the strength of the membrane will definitely decrease accordingly.
This is due to the continuous and dense distribution of sacrificial fibers in the membrane, which actually forms a continuous hole in the membrane after the channel is formed, thus reducing the mechanical strength of the membrane.

Method used

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  • Hole-containing fiber reinforced ion exchange membrane for chlor-alkali industry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The perfluorosulfonic acid resin in this example is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, and its ion exchange capacity is 0.95mmol / g.

[0039] (1) Preparation of resin pellets

[0040] Calcium carbonate with an average particle size of 25 nanometers and the above-mentioned perfluorosulfonic acid resin powder are fully mixed at a mass ratio of 4:100, then melt-extruded and granulated to obtain pellets of perfluorosulfonic acid resin containing inorganic sacrificial materials.

[0041] The powder obtained by copolymerization of tetrafluoroethylene and perfluoro4,7-dioxa-5methyl-8-nonenoate methyl ester has an ion exchange capacity of 0.94mmol / g, and is granulated by melt extrusion to obtain perfluorocarboxylate Pellets of acid resin.

[0042] (2) Membrane preparation and reinforcement

[0043] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid r...

Embodiment 2

[0048] The perfluorosulfonic acid resin in this example is a powder obtained by copolymerization of tetrafluoroethylene, hexafluoropropylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, and its ion exchange capacity is 0.98mmol / g.

[0049] (1) Preparation of resin pellets

[0050] Calcium carbonate with a particle size of 80±10 nanometers and the above-mentioned perfluorosulfonic acid resin powder are fully mixed at a mass ratio of 20:100, and then melt-extruded and granulated to obtain pellets of perfluorosulfonic acid resin containing inorganic sacrificial materials.

[0051] 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.

[0052] (2) Membrane preparation and reinforcement

[0053] Using the above-mentioned perfluorocarboxylic acid resin pellets and perf...

Embodiment 3

[0058] Step (1), step (2) and step (3) are the same as in Example 1, except that the average particle size of calcium carbonate in step (1) is 55±10 nm.

[0059] The prepared ion membrane tensile strength of the present embodiment is 31MPa, can be used for the ion exchange membrane in the chlor-alkali ion membrane electrolyzer, at 4.5kA / 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 3.10-3.13V, and the cathode alkali current efficiency is 96.7%.

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Abstract

The invention relates to a hole-containing fiber reinforced ion exchange membrane for the chlor-alkali industry and a preparation method thereof. The membrane is a multi-layer composite membrane composed of a perfluorinated sulfonic acid ion exchange resin layer, a perfluorinated carboxylic acid ion exchange resin layer, a reinforced mesh and a gas release coating, wherein the perfluorinated sulfonic acid resin layer contains reinforced fibers and nano holes. The membrane is prepared through a melt coextrusion or multi-layer hot pressing composite process. The membrane can be used as an ion exchange membrane for the chlor-alkali industry, and has good mechanical properties and electrochemical properties.

Description

Technical field: [0001] The invention relates to a hole-containing fiber-reinforced ion-exchange membrane used in the chlor-alkali industry and a preparation method thereof, belonging to the technical field of fluoride ion membranes. Background technique: [0002] DuPont of the United States developed perfluorosulfonic acid resin and its ion exchange membrane in the 1960s. It was quickly found that this perfluorinated ion exchange membrane with a skeleton structure has extraordinary stability and is most suitable for use in the harsh environment of chlor-alkali electrolyzers, so it has been widely used in the chlor-alkali industry. Inspired by DuPont's perfluorinated ion-exchange membrane, Japan's Asahi Glass Company and Japan's Asahi Kasei Corporation have also successively developed perfluorinated ion-exchange resins and ion-exchange membranes with similar structures. In 1976, Asahi Kasei Corporation of Japan replaced DuPont's perfluorosulfonic acid membrane with a perflu...

Claims

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Application Information

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IPC IPC(8): C25B13/00C25B1/46C08J5/22
Inventor 王学军唐军柯张永明张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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