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Polytetrafluoroethylene interlayer protection ion exchange membrane, preparation method thereof, and application thereof in field of electrolysis

The technology of polytetrafluoroethylene and ion exchange membrane is applied in the field of electrolysis and can solve the problems of inability to prepare large-sized polyethylene-styrene type homogeneous cation exchange membrane, inability to meet industrial production requirements, poor stability of ion exchange membrane, etc. Achieve low cost of materials, promote industrialization and large-scale development, and achieve the effect of corrosion resistance

Inactive Publication Date: 2021-01-01
HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the irradiation grafting method existing in the prior art, because of processing technology problems, large-sized polyethylene-styrene type homogeneous cation exchange membranes cannot be prepared, which cannot meet the needs of industrial production; while the infiltration method prepares homogeneous cation exchange membranes, Because the soaking time is relatively long and hot pressing is needed so the technical problems of continuous production difficulty etc., the purpose of the present invention is to provide a polytetrafluoroethylene interlayer protective ion exchange membrane, by adopting the continuous homogeneous cation exchange membrane made by impregnation method, Then compound a highly corrosion-resistant polytetrafluoroethylene microporous membrane on the surface of the base membrane to obtain an ion membrane that is corrosion-resistant, long-lived, and suitable for application in the electrolysis industry.
[0004] In order to overcome the problem of poor stability of the existing ion exchange membrane, another object of the present invention is to provide a method for preparing a polytetrafluoroethylene interlayer protective ion exchange membrane that meets the requirements of high ion selectivity and high stability

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  • Polytetrafluoroethylene interlayer protection ion exchange membrane, preparation method thereof, and application thereof in field of electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A polytetrafluoroethylene interlayer protective ion-exchange membrane, comprising an ion-exchange membrane base membrane and a polytetrafluoroethylene microporous membrane attached to one or both sides of the ion-exchange membrane base membrane as an interlayer protection membrane;

[0029] The ion-exchange membrane base membrane is a continuous homogeneous cation-exchange membrane made by an impregnation method, and its preparation method comprises the following steps:

[0030] a. Add phenol in the container, then add a certain amount of concentrated sulfuric acid, wherein the mass ratio of phenol and concentrated sulfuric acid is 1:2, react to obtain a brown p-hydroxybenzenesulfonic acid crystal, wash off its redundant acid with water;

[0031] b. Mix brown p-hydroxybenzenesulfonic acid and aldehyde aqueous solution in the ratio of 1:0.6 by weight and place them in the rubber basin of the glue machine;

[0032] c. Utilize the reinforcing material, soak in the rubber b...

Embodiment 2

[0041] The difference between this embodiment and the above-mentioned embodiment 1 is:

[0042] The ion-exchange membrane base membrane is a continuous homogeneous cation-exchange membrane made by an impregnation method, and its preparation method comprises the following steps:

[0043] a. Add phenol in the container, then add a certain amount of vitriol oil, wherein the mass ratio of phenol and vitriol oil is 1:3.5, react to obtain a brown p-hydroxybenzenesulfonic acid crystal, wash off its redundant acid with water;

[0044] b. Mix brown p-hydroxybenzenesulfonic acid and aldehyde aqueous solution in the ratio of 1:1 by weight and place them in the rubber basin of the glue machine;

[0045] c. Utilize the reinforcing material, soak in the rubber basin of the gluing machine, and then send it to the drying area of ​​the gluing machine, volatilize the solvent and solidify in different regions, and make a continuous roll-shaped homogeneous cation exchange membrane.

[0046]Prefe...

Embodiment 3

[0049] The difference between this embodiment and the above-mentioned embodiment 1 is:

[0050] The ion-exchange membrane base membrane is a continuous homogeneous cation-exchange membrane made by an impregnation method, and its preparation method comprises the following steps:

[0051] a. Add phenol in the container, then add a certain amount of concentrated sulfuric acid, wherein the mass ratio of phenol and concentrated sulfuric acid is 1:5, react to obtain a brown p-hydroxybenzenesulfonic acid crystal, wash off its redundant acid with water;

[0052] b. Mix brown p-hydroxybenzenesulfonic acid and aldehyde aqueous solution in the ratio of 1:1.6 by weight and place them in the rubber basin of the glue machine;

[0053] c. Utilize the reinforcing material, soak in the rubber basin of the gluing machine, and then send it to the drying area of ​​the gluing machine, volatilize the solvent and solidify in different regions, and make a continuous roll-shaped homogeneous cation exc...

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Abstract

The invention relates to the technical field of electrolysis, and especially relates to a polytetrafluoroethylene interlayer protection ion exchange membrane, a preparation methodthereof, and application thereof in the field of electrolysis. The polytetrafluoroethylene interlayer protection ion exchange membrane comprises an ion exchange membrane base membrane and a polytetrafluoroethylene microporous membrane which serves as an interlayer protection membrane and is attached to one side or two sides of the ion exchange membrane base membrane; and the ion exchange membrane base membrane is a continuous homogeneous cation exchange membrane manufactured by adopting an impregnation method. According to the polytetrafluoroethylene interlayer protection ion exchange membrane disclosed by the invention, the polytetrafluoroethylene microporous membrane is used for protection on one side or two sides of the sulfonated polymer ion exchange membrane base membrane, and by means of the characteristics of high chemical stability, strong acid corrosion resistance, high strength, uniform pore size distribution and the like of the polytetrafluoroethylene microporous membrane, the stability and theion selectivity of the ion exchange membrane are obviously improved, so that the ion exchange membrane meets the requirements of two aspects at the same time.

Description

technical field [0001] The invention relates to the technical field of electrolysis, in particular to a polytetrafluoroethylene interlayer protective ion exchange membrane, a preparation method thereof and an application in the field of electrolysis. Background technique [0002] At present, ion exchange membranes have been widely used in various industrial fields, such as: electrodialysis to concentrate or desalt materials, diffusion dialysis to produce various acids, proton exchange membranes for fuel cells, etc. The homogeneous cation exchange membrane has the characteristics of uniform and dense structure and low resistance due to the chemical bond between the fixed group and the main body of the membrane phase. Compared with heterogeneous ion exchange membranes, its performance is superior. The homogeneous cation exchange membrane began to use γ-ray irradiation grafting method, the method is as follows: firstly, the polyethylene film was irradiated with 60(Co)-γ ray to...

Claims

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Application Information

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IPC IPC(8): C25B13/08C25C7/04
CPCC25B13/08C25C7/04
Inventor 罗国华刘碧华顾晓聪
Owner HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD