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Zero-polar-distance ion exchange membrane and preparation method thereof

An ion exchange membrane and zero-pole distance technology, applied in the field of ion membrane, can solve the problems of reduced anti-foaming function, low anti-foaming ability, and difficulty in large-area implementation, so as to reduce surface resistance and cell voltage, and reduce accumulation. , good anti-foaming effect

Active Publication Date: 2014-09-03
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrophilic coating modification process needs to be mixed with inorganic components and special binders, and then covered on the surface of the ionic membrane by electrolytic deposition, particle embedding, etc. Patents CA2446448 and CA2444585 have introduced the coating process in detail ; but although this modification method is effective, the process is relatively complicated
In addition, because the ionic membrane will experience continuous scouring and turbulence caused by the lye flow during the electrolysis operation, the hydrophilic coating attached to the surface of the ionic membrane will gradually fall off, and the anti-foaming function will gradually decrease to ineffective.
[0004] The patent US4502931 mentions that the surface of the ionic membrane is roughened by ion etching, but this method is not easy to implement in a large area, and the anti-foaming ability is not high. When the distance between the electrodes is reduced to a certain extent, the groove voltage is still greater than 3.5V, and the current efficiency is less than 90%

Method used

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  • Zero-polar-distance ion exchange membrane and preparation method thereof
  • Zero-polar-distance ion exchange membrane and preparation method thereof
  • Zero-polar-distance ion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Including the following preparation methods:

[0049] (1) The perfluorosulfonic acid resin of IEC=1.4mmol / g, the perfluorosulfonic acid carboxylic acid copolymer resin of IEC=1.0mmol / g and the perfluorocarboxylic acid resin of IEC=0.95mmol / g, according to the mass parts The ratio is 100:5:10 and composited into a composite film by co-extrusion casting, with a total thickness of 135 microns. At the same time, PTFE mesh cloth is introduced between the film forming rollers, and the polymer film is formed by rolling and compounding into the film body.

[0050] (2) Immerse the polymer membrane in step (1) in a mixed aqueous solution containing 15wt% dimethyl sulfoxide and 20wt% NaOH at 85° C. for 80 minutes to convert it into an ion exchange membrane with ion exchange function.

[0051] (3) Water and ethanol are formulated into a mixed solution according to a weight ratio of 1:1, and then the perfluorosulfonic acid resin of IEC=0.9mmol / g is dissolved into the water-alcohol ...

Embodiment 2

[0060] The same method as in Example 1 was used to prepare an ion exchange membrane with ion exchange function. Afterwards, water and ethanol are formulated into a mixed solution according to a weight ratio of 1:1, and then the fluorine-containing sulfonic acid resin with IEC=0.9mmol / g is dissolved into the water-alcohol mixed solution to form a sulfonic acid resin solution with a concentration of 6wt%. ; Add IEC=0.45mmol / g, average particle diameter of 0.05 micron, perfluorosulfonic acid resin crushed microparticles with irregular polyhedral appearance to the above solution, homogenize in a ball mill, and form a content of 9wt% Dispersions. Using the method of spraying, the dispersion liquid is attached to the surface of both sides of the above-mentioned ion exchange membrane with ion exchange function, and after drying, a discontinuous porous gas release layer with a porosity of 91% is formed, and the broken particles of perfluorosulfonic acid resin are compounded The distr...

Embodiment 3

[0064] The same method as in Example 1 was used to prepare an ion exchange membrane with ion exchange function. After that, water and propanol are formulated into a mixed solution according to a weight ratio of 1:1, and then the fluorine-containing sulfonic acid resin with IEC=0.9mmol / g is dissolved into the water-alcohol mixed solution to form a sulfonic acid resin with a concentration of 1wt%. solution; then add IEC=0.75mmol / g, average particle diameter of 5 microns, and broken particles of perfluorosulfonic acid resin with irregular polyhedral morphology into the above solution, and homogenize them in a ball mill to form a content of 4.6wt % of the dispersion. By brushing, the dispersion liquid is attached to the surface of both sides of the above-mentioned ion exchange membrane with ion exchange function, and after drying, a discontinuous porous gas release layer with a porosity of 94% is formed, and the broken particles of perfluorosulfonic acid resin are The distributio...

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Abstract

The invention belongs to the technical field of ion membranes, which particularly relates to a zero-polar-distance ion exchange membrane. The ion exchange membrane is converted from a polymer membrane which is prepared by compounding a perfluorinated ion exchange resin and a reinforcement material, wherein a non-electrode porous gas releasing layer is arranged on at least one side of the ion exchange membrane and is formed by bonding a dispersion liquid on the surface of an ion exchange membrane layer and then drying; the dispersion liquid is formed by dispersing the broken microparticles of a perfluorinated sulfonic acid resin in an aqueous alcohol solution of the sulfonic acid resin. The prepared zero-polar-distance ion exchange membrane which is applied to the chlor-alkali industry can be used for stably and efficiently treating an alkali metal chloride solution with high impurity content and is more suitable for being applied in a zero-polar-distance electrolytic bath under a high current density condition as well as has an extremely low surface resistance. The invention further provides a preparation method of the zero-polar-distance ion exchange membrane. The method is reasonable in process and easy for industrial production.

Description

technical field [0001] The invention belongs to the technical field of ionic membranes, and in particular relates to a zero-pole distance ion exchange membrane and a preparation method thereof. Background technique [0002] In recent years, in the production of chlor-alkali by ion-exchange membrane method, in order to realize electrolysis under the conditions of high current density, low cell voltage and high concentration of lye, in order to achieve the purpose of increasing productivity and reducing power consumption, the key is to shorten the ion-exchange membrane The distance between the electrode and the electrode can be reduced to reduce the cell voltage, so that the narrow pole distance ion membrane electrolysis process can be practical. With the continuous advancement of technology, the zero-electrode distance electrolyzer has been widely used, but when the distance between the electrodes is reduced to less than 2mm, the hydrogen bubbles attached to the membrane surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/08C08J2327/12C08J5/2237H01M8/1058H01M8/1069H01M8/1039Y02P70/50Y02E60/50B01D67/0013C25B13/02B01D69/02B01D2323/46B01D2325/42
Inventor 王婧张永明杨淼昆张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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