Fiber-reinforced perfluorinated ion exchange membrane containing non-continuous nano-pore canal and preparation method thereof

An ion exchange membrane and perfluorinated ion technology, applied in the field of fiber reinforced perfluorinated ion exchange membrane and its preparation, can solve the problems of reducing the mechanical strength of the membrane, decreasing the membrane strength, etc., so as to improve the mechanical strength, reduce the cell voltage, and reduce the transmission. The effect of resistance

Active Publication Date: 2013-04-10
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 stably, the sacrificial fiber slowly dissolves and disappears, which naturally reduces the resistance of the membrane, but the strength of the membrane also decreases accordingly.
This is because the sacrificial fibers are continuously and densely distributed in the membrane, and a continuous hole is actually formed in the membrane after the channels are formed, thus reducing the mechanical strength of the membrane.

Method used

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  • Fiber-reinforced perfluorinated ion exchange membrane containing non-continuous nano-pore canal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The perfluorosulfonic acid resin in this example has an ion exchange capacity of 0.95 mmol / g, and is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride body.

[0043] (1) Preparation of resin pellets

[0044] The PET fiber (nano sacrificial fiber material) with a diameter of 20±5 nanometers and a length of 10±2 microns (nano sacrificial fiber material) is fully mixed with the above-mentioned perfluorosulfonic acid resin powder at a mass ratio of 4:100, and then melted and extruded to obtain a nano sacrificial fiber material pellets of perfluorosulfonic acid resin.

[0045] The powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5methyl-8-nonenoate methyl ester is melt-extruded and granulated to obtain pellets of perfluorocarboxylic acid resin; ion exchange capacity It is 0.92 mmol / g.

[0046] (2) Membrane preparation and reinforcement

[0047] Using the above-mentione...

Embodiment 2

[0052] The raw materials of perfluorosulfonic acid resin and perfluorocarboxylic acid resin powder are the same as in Example 1.

[0053] (1) Preparation of resin pellets

[0054] Nylon 66 fibers with a diameter of 20 ± 5 nanometers and a length of 15 ± 5 microns are fully mixed with the above-mentioned perfluorosulfonic acid resin powder at a mass ratio of 10:100, and then melt-extruded and granulated to obtain a perfluorosulfonic acid resin containing nanofiber materials of pellets. The preparation of pellets of perfluorocarboxylic acid resin is as in Example 1.

[0055] (2) Membrane preparation and reinforcement

[0056] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid resin pellets containing nanofibrous materials, obtain perfluorocarboxylic acid ion exchange resin membranes and perfluorosulfonic acid ion exchange resin membranes containing perfluorosulfonic acid ion exchange resin membranes by melt extrusion. Fluorine ion exch...

Embodiment 3

[0061] Step (1), step (2) and step (3) are the same as in Example 1, except that the PET fiber in step (1) has a diameter of 50±5 nanometers and a length of 20±2 micrometers.

[0062] The prepared ion membrane tensile strength of the present embodiment is 34MPa, 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 3.11-3.14V, and the cathode alkali current efficiency is 96.6%.

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Abstract

The invention relates to a fiber-reinforced perfluorinated ion exchange membrane containing a non-continuous nano-pore canal and a preparation method thereof. A basic membrane of the membrane comprises a perfluorosulfonic acid ion exchange resin layer and a perfluorocarboxylic acid ion exchange resin layer, reinforcing fiber mesh cloth is arranged in the perfluorosulfonic acid resin layer, and gas release coatings are sprayed on the surfaces on the two outer sides of the basic membrane; and the fiber-reinforced perfluorinated ion exchange membrane is characterized in that the non-continuous nano-pore canal is further contained in the perfluorosulfonic acid resin layer. The membrane is prepared through a melting co-extrusion or multi-layer hot-pressing compounding process. The membrane is used for the ion exchange membrane in the chlor-alkali industry and has better mechanical properties and electrochemical properties.

Description

technical field [0001] The invention relates to a fiber-reinforced perfluorinated ion-exchange membrane containing discontinuous nano-channels for the chlor-alkali industry and a preparation method thereof, belonging to the field of polymer materials. 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 membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B1/46C08J9/36C08J9/26
Inventor 王学军王婧张恒张永明
Owner SHANDONG DONGYUE POLYMER MATERIAL
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