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Uncoated zero-polar-distance ion exchange membrane and preparation method thereof

A technology of ion-exchange membrane and zero pole distance, which is applied in the direction of chemical instruments and methods, membrane technology, organic diaphragm, etc., can solve the problems of performance degradation, coating peeling, etc., and achieve the goal of reducing cell voltage, prolonging service life, and reducing accumulation Effect

Active Publication Date: 2013-03-13
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention optimizes the structure of the coating through the composition of the special dispersion liquid, and effectively improves the anti-impurity performance of the ion exchange membrane while avoiding the "bubble effect". However, the coating still falls off during installation and operation, and the performance gradually declines. the trend of

Method used

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  • Uncoated zero-polar-distance ion exchange membrane and preparation method thereof
  • Uncoated zero-polar-distance ion exchange membrane and preparation method thereof
  • Uncoated zero-polar-distance ion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: Preparation of an uncoated zero-pole-distance sub-exchange membrane with a four-layer membrane structure

[0054] The uncoated zero-pole distance sub-exchange membrane with four-layer membrane structure is composed of perfluorinated ion-exchange resin base membrane and reinforcing material. The perfluorinated ion-exchange resin base membrane has a four-layer membrane structure through multi-layer co-extrusion prepared in the same way; among them, the first film from top to bottom is perfluorosulfonic acid resin with IEC=1.4mmol / g (M in formula I is -SO 2 F, x=2.9, n=1, m=3); the second film is perfluorocarboxylic acid resin with IEC=0.95mmol / g (M in formula I is -COOCH 3 , x=6.3, n=1, m=3); the third film is a perfluorosulfonic acid carboxylic acid blend resin with IEC=1.0mmol / g (x=4.5, n=1, m=3, blended The mass ratio is 1:1); the fourth film is a perfluorosulfonic acid resin with IEC=1.33mmol / g (M in formula I is -SO 2 F, x=3.6, n=1, m=4); the thickness i...

Embodiment 2

[0059] Example 2: Preparation of an uncoated zero-pole distance sub-exchange membrane with a five-layer membrane structure

[0060] (1) IEC=1.15mmol / g perfluorosulfonic acid resin (1 layer of raw materials) (x=5.1, n=0, m=5), IEC=0.99mmol / g perfluorocarboxylic acid resin (2 layers Raw material) (x=7.3, n=1, m=2), IEC=1.0mmol / g perfluorosulfonic acid carboxylic acid blend resin (3-layer raw material) (x=6.5, n=1, m=4) , IEC=1.1mmol / g perfluorosulfonic acid resin (4 layers of raw materials) (x=5.3, n=1, m=5) and IEC=1.28mmol / g perfluorosulfonic acid resin (5 layers of raw materials) ( x=4.0, n=1, m=3) were compounded into films by co-extrusion casting, in which the thickness of 1 layer was 15 microns, the thickness of 2 layers was 8 microns, the thickness of 3 layers was 70 microns, and the thickness of 4 layers was 50 microns, 5-layer thickness of 15 microns, and a total thickness of 158 microns; PFA mesh cloth is introduced during the forming process, and rolled into the film...

Embodiment 3

[0063] Example 3: Preparation of an uncoated zero-pole distance sub-exchange membrane with a six-layer membrane structure

[0064] (1) IEC=1.2mmol / g perfluorosulfonic acid resin (1 layer raw material) (x=4.9, n=0, m=3), IEC=1.05mmol / g perfluorosulfonic acid resin (2 layers Raw material) (x=6.0, n=1, m=4), IEC=0.92mmol / g perfluorocarboxylic acid resin (3-layer raw material) (x=7.3, n=1, m=3), IEC=1.0 mmol / g perfluorosulfonic acid carboxylic acid blend resin (4 layers of raw material) (x=5.1, n=0, m=5), IEC=1.05mmol / g perfluorosulfonic acid carboxylic acid blend resin (5 layer raw material) (x=4.4, n=1, m=4) and IEC=1.3mmol / g perfluorosulfonic acid resin (6 layer raw material) (x=3.5, n=0, m=3) by co-extrusion The composite film is formed by casting, wherein the thickness of 1 layer is 10 microns, the thickness of 2 layers is 20 microns, the thickness of 3 layers is 50 microns, the thickness of 4 layers is 90 microns, the thickness of 5 layers is 30 microns, and the thickness o...

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Abstract

The invention relates to an uncoated zero-polar-distance ion exchange membrane and a preparation method thereof. The uncoated zero-polar-distance ion exchange membrane is formed by compounding of a perfluorinated ion exchange resin base film and a reinforcing material, wherein the perfluorinated ion exchange resin base film is prepared from at least four layers of film structure in a multi-layer co-extrusion manner; and the exchange capacities of the films on two sides of the outermost layer are not less than 1.15mmol / g, and the film on at least one side has a taper pin roughened surface of which the depth is 15-30 microns. The preparation method of the uncoated zero-polar-distance ion exchange membrane is also provided by the invention. By adopting the uncoated zero-polar-distance ion exchange membrane, the current efficiency is greatly improved under a high-current density condition; the bath voltage is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to an uncoated zero-pole-distance ion-exchange membrane and a preparation method thereof, belonging to the technical field of ion-exchange membrane preparation. Background technique [0002] Perfluorinated ion exchange membrane is the core component of ion membrane alkali production in chlor-alkali industry. The original perfluorinated ion exchange membrane for chlor-alkali encountered practical problems such as "bubble effect" due to poor surface hydrophilicity during operation, resulting in the accumulation of chlorine gas on the surface of the ion-exchange membrane to form bubbles, which seriously hindered the passage of current. , so that the cell pressure increases, and the current density and current efficiency are greatly reduced, especially in zero-distance electrolyzers. People immediately proposed some methods to improve the hydrophilicity of its surface. There are two main types: one is to roughen the surface of the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/66B01D69/12B01D67/00C25B1/46C25B13/08
Inventor 王婧赵宽宗少杰张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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