Method for making cation exchange membrane through photocuring

A cation exchange membrane and photocuring technology, applied in the field of ion exchange membrane, can solve the problems of air pollution working environment, harsh film forming conditions, limited application scope, etc., and achieve low environmental and human harm, fast polymerization speed, and excellent mechanical properties. Effect

Inactive Publication Date: 2014-07-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its film-forming method has the following disadvantages: (1) The film-forming conditions are harsh
It needs to be carried out under high pressure and high temperature exceeding 100°C. At this temperature, many highly active groups such as haloalkanes, epoxy groups, acid radicals, etc. will inevitably undergo decomposition, oxidation and ester-forming reactions, making the application range of this process Limited; (2) Long film-forming time, hot-press polymerization time of more than 3 hours, resulting in low production efficiency; (3) Serious pollution, due to the long film-forming time and high temperature of the process, solvents and monomers are easily removed from the system Volatilized in the medium, causing equipment corrosion, air pollution and deterioration of the working environment; (4) Generally, only relatively weak acidic benzenesulfonic acid can be produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, the sulfonic acid type cation exchange membrane is prepared by photocuring method, and the specific process is as follows:

[0038] (1) Add 100 parts of allyl glycidyl ether, 40 parts of styrene and 30 parts of PVC into a three-necked flask, stir and dissolve in the dark, then add 30 parts of divinylbenzene, 8 parts of initiator 184, and 8 parts of triethanolamine, Stir in the dark for 2 hours to dissolve and make a slurry;

[0039] (2) Squeegee-coat the slurry on a glass plate lined with polyester mesh, and cure it under a 400w UV lamp for 15 minutes;

[0040] (3) Remove the solidified product and treat it in 98% concentrated sulfuric acid for 4 hours to obtain a sulfonic acid ion exchange membrane.

[0041] The sulfonic acid type cation exchange membrane prepared above has a thickness of 0.18mm, an exchange capacity of 2.1meq / g, a water content of 20%, a swelling rate of 2.5% (25°C), and a surface resistance of 1.2Ω·cm 2 (0.5NNaCl aqueous solutio...

Embodiment 2

[0043] In this embodiment, the sulfonic acid type cation exchange membrane is prepared by photocuring method, and the specific process is as follows:

[0044] (1) Add 100 parts of styrene, 20 parts of allyl ether and 20 parts of PVC into a three-necked bottle, stir and dissolve in the dark, add 4 parts of initiator 184, 4 parts of triethanolamine, and stir for 2 hours in the dark to make a slurry material;

[0045] (2) Squeegee-coat the slurry on a glass plate lined with polyester mesh, and cure it under a 400w UV lamp for 15 minutes;

[0046] (3) Remove the solidified product and treat it in 98% concentrated sulfuric acid at 60°C for 12 hours to obtain a sulfonic acid ion exchange membrane.

[0047] The sulfonic acid type cation exchange membrane prepared above has a thickness of 0.21mm, an exchange capacity of 2.5meq / g, a water content of 28%, a swelling rate of 3.5% (25°C), and a surface resistance of 1.5Ω·cm 2 , the tensile strength is 80MPa, and the burst strength is >1...

Embodiment 3

[0049] In this embodiment, the sulfonic acid type cation exchange membrane is prepared by photocuring method, and the specific process is as follows:

[0050] (1) Add 40 parts of allyl mercaptan, 100 parts of styrene and 10 parts of allyl ether into a three-necked flask, stir and dissolve in the dark, add 4 parts of initiator 184 and 4 parts of triethanolamine, and stir for 1 hour in the dark , made into slurry;

[0051] (2) Squeegee-coat the slurry on a glass plate lined with polyester mesh to form a film, and cure it under a 400w ultraviolet lamp for 15 minutes;

[0052] (3) Take off the solidified product, wash it in water, and then oxidize it with 10% hydrogen peroxide to obtain a strongly acidic sulfonic acid ion exchange membrane.

[0053] The sulfonic acid type cation exchange membrane prepared above has a thickness of 0.25mm, an exchange capacity of 2.0meq / g, a swelling rate of 1.8% (25°C), and a surface resistance of 0.8Ω·cm 2 , the tensile strength is 78MPa, and th...

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Abstract

The invention provides a method for making a cation exchange membrane through photocuring. The method comprises the following steps: coating a substrate with a slurry containing a polymerizable monomer and a photoinitiator, wherein the polymerizable monomer contains sulfonate ions or a compound containing a functional group which can introduce the sulfonate ions; initiating the polymerization and crosslinking of alkenyl function groups on the monomer in the initiating slurry; and washing, and post-processing to obtain the sulfonic acid type cation exchange membrane with a physical conformation. Compared with present making methods of the cation exchange membrane through a hot pressing polymerization process, the method has the advantages of fast polymerization speed, low polymerization temperature, fast curing time and small pollution, and the obtained cation exchange membrane has the advantages of uniformity, stability, good mechanical properties and good chemical resistance, so the cation exchange membrane has a good application prospect in the fields of electrodialysis water treatment, pervaporation, gas separation, new energy batteries, the atomic energy industry and analysis, catalytic synthesis and the chlorine alkali industry.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a photocuring film-forming method and its application in cation-exchange membranes. Background technique [0002] The ion exchange membrane is a polymer membrane containing ionic groups and has the ability to selectively permeate the ions in the solution. Because its ion selective permeability is mainly used in application, it is also called ion selective permeability membrane. [0003] Ion exchange membranes can be assembled into electrodialyzers for desalination of brackish water and concentration of saline solutions. , It can also be used for desalination of glycerin and polyethylene glycol, separation of various ions and radioactive elements, isotopes, fractionation of amino acids, etc. In addition, ion exchange membranes are also used in the purification of organic and inorganic compounds, the treatment of radioactive waste liquid in the atomic e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/22C08L29/10C08L25/08C08L33/14C08F216/14C08F220/32C08F212/08C08F212/36C08F228/02C08F2/48B01D71/38B01D71/28B01D71/40B01D67/00
Inventor 薛立新聂锋陶慷章勤魏增斌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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