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Low-resistance and high-strength ion exchange membrane for chlor-alkali industry and preparation method of low-resistance and high-strength ion exchange membrane

A technology of ion exchange membrane and chlor-alkali industry, which is applied in the field of polymer materials, can solve the problems of membrane strength reduction and membrane mechanical strength reduction, and achieve the effects of reducing cell voltage, improving mechanical strength, and reducing transmission resistance

Active Publication Date: 2013-03-20
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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  • Low-resistance and high-strength ion exchange membrane for chlor-alkali industry and preparation method of low-resistance and high-strength ion exchange membrane

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] The perfluorocarboxylic acid resin in this example has an ion exchange capacity of 0.93 mmol / g, and is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5-methyl-8-nonenoic acid methyl ester.

[0044] (1) Preparation of resin pellets

[0045] Mix PET fibers with a diameter of 20±5 nanometers and a length of 10±2 microns with calcium carbonate with an average particle diameter of 25 nanometers at a mass ratio of 80:20 to obtain a mixed nano sacrificial material.

[0046] The mixed nano sacrificial material and the above-mentioned perfluorosulfonic acid resin powder are fully mixed according to the mass ratio of 4:100, and then melted, extruded and granulated to obtain perfluorosulfonic acid resin pellets...

Embodiment 2

[0055] Embodiment 2: The perfluorosulfonic acid resin and perfluorocarboxylic acid resin powders in this embodiment are the same as those in Embodiment 1.

[0056] (1) Preparation of resin pellets

[0057] The mixed nano sacrificial material is: a mixture of nylon 66 with a diameter of 20±5 nanometers and a length of 10±2 microns and calcium carbonate particles with an average particle diameter of 80 nanometers in a mass ratio of 30:70.

[0058] Fully mix the mixed nano sacrificial material with the above-mentioned perfluorosulfonic acid resin powder at a mass ratio of 10:100, then melt, extrude and granulate to obtain pellets of perfluorosulfonic acid resin containing nanofiber materials, perfluorocarboxylic acid resin powder The pellets of the perfluorocarboxylic acid resin are obtained through melt extrusion and granulation.

[0059] (2) Membrane preparation and reinforcement

[0060] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic a...

Embodiment 3

[0068] 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.

[0069] The ion-exchange membrane prepared by the present embodiment has a tensile strength of 33MPa, and is used for the ion-exchange membrane in the chlor-alkali ion-exchange 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 3.10-3.12V, and the cathode alkali current efficiency is 96.7%.

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Abstract

The invention relates to a low-resistance and high-strength ion exchange membrane for the chlor-alkali industry and a preparation method of the low-resistance and high-strength ion exchange membrane. The low-resistance and high-strength ion exchange membrane is a multi-layer composite membrane comprising a perfluorosulfonic ion exchange resin layer, a perfluoropropionate ion exchange resin layer, reinforced screen cloth and gas release coatings, wherein the perfluorosulfonic ion exchange resin layer with the thickness of 80-150 micrometers and the perfluoropropionate ion exchange resin layer with the thickness of 8-12 micrometers form a perfluorosulfonic ion exchange resin base membrane, the gas release coatings with 3-12 micrometers are arranged on two outer side surfaces of the base membrane, the reinforced screen cloth is arranged in the perfluorosulfonic ion exchange resin layer, and the perfluorosulfonic ion exchange resin layer is also internally provided with a nano pore and a nano cavity. The low-resistance and high-strength ion exchange membrane can be prepared through a melt co-extruding or multi-layer hot-pressing compounding process, can be used in an ion exchange membrane in the chlor-alkali industry, and has good mechanical property and electrochemical performance.

Description

technical field [0001] The invention relates to a low-resistance and high-strength ion exchange membrane for 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 membrane with a perfluorocarboxylic acid membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/46C25B13/08C25B13/02C08J5/22
Inventor 王学军于昌国董辰生张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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