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Preparation method of homogeneous PVC-based anion exchange membrane

An anion exchange membrane and base membrane technology, applied in anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of non-crosslinked network structure, complex preparation process, uneven impregnation, etc., and achieve good dimensional stability , The process is simple and the price is low

Active Publication Date: 2020-03-06
海丝节水科技(天津)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ion-exchange membrane resin powder in the early stage of the method uses PVC to impregnate monomers, which is unevenly impregnated and has certain limitations; in addition, the processing temperature is high, and PVC and functional ions are prone to degradation, especially PVC semi-homogeneous anion-exchange membranes;
[0004] Chinese patent 201610726919.8 discloses a PVC-based homogeneous anion exchange membrane and its preparation method. The method uses polyvinyl chloride, NaN3, a catalyst and a solvent to mix and react to obtain a PVC-N3 graft polymer solution; Branch polymer solution, cuprous bromide, pentamethyldiethylenetriamine and alkyne compounds are mixed and reacted to obtain an intermediate polymer, and the intermediate polymer, methyl iodide and solvent are mixed and reacted to obtain a PVC-based polymer Dissolve the PVC-based polymer in an organic solvent, configure the casting solution and scrape the film, and get the PVC homogeneous anion-exchange membrane after removing the organic solvent; the homogeneous anion-exchange membrane prepared by this method has no cross-linked structure, The swelling of the membrane will be relatively large, and the preparation process is more complicated
[0006] The literature "Preparation of quaternized polyvinyl chloride homogeneous anion exchange membrane for electrodialysis" reported that 1-methylimidazole was used as a nucleophilic quaternization reagent to modify polyvinyl chloride in one step to prepare homogeneous polyvinyl chloride Vinyl chloride-based anion exchange membrane, which also has swelling problems, because it has no cross-linked network structure, and the literature also reports that the lowest resistance of the membrane is 14.1Ω·cm 2 , there is still a large energy consumption in the electrodialysis process

Method used

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  • Preparation method of homogeneous PVC-based anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the homogeneous PVC base anion exchange membrane of this example, its steps are:

[0027] PVC and N,N-dimethylformamide are configured into a uniform casting solution according to a mass ratio of 15:100; mm, the number of meshes is 100 meshes) on the coating film, treated in a hot water tank and dried to form a PVC base film with a thickness of 0.12mm; the pore size of the PVC base film is 0.5 microns; 1-vinylimidazole and azobis The isobutyronitrile is configured into a uniform monomer mixed solution according to the mass ratio of 100:0.5; the PVC base film is soaked in the monomer mixed solution, and the soaking temperature is controlled at 65°C, and the soaking time is 5h. The soaked PVC base film and the polyester protective film are stacked at intervals, compressed and rolled up, and then polymerized at 85°C for 20 hours, and then the polyester protective film is peeled off to obtain a roll-type homogeneous PVC anion exchange membrane.

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Embodiment 2

[0030] The preparation method of the homogeneous PVC base anion exchange membrane of this example, its steps are:

[0031] PVC and N,N-dimethylacetamide are configured into a uniform casting solution according to a mass ratio of 25:100; 100 mesh) coating film, treated in a hot water tank and dried to form a PVC base film with a thickness of 0.14mm; the pore diameter of the PVC base film is 0.3 micron; 1-vinylimidazole and dibenzoyl peroxide The mass ratio is 100:0.5 to configure a uniform monomer mixed solution; soak the PVC base film in the monomer mixed solution, control the soaking temperature to 65°C, and the soaking time to 6h. The soaked PVC base film and the polyester protective film are stacked at intervals, pressed tightly and rolled up, and then polymerized at 90°C for 24 hours, and then peeled off the polyester protective film to obtain a roll-type homogeneous PVC anion exchange membrane.

[0032] According to the measurement method described in the industry stand...

Embodiment 3

[0034] The preparation method of the homogeneous PVC base anion exchange membrane of this example, its steps are:

[0035] The PVC and N-methylpyrrolidone are configured into a uniform casting solution according to the mass ratio of 40:100; after the casting solution is ultrasonically degassed, it is placed on a nylon mesh cloth (the thickness of the mesh is 0.1mm, and the mesh number is 80 mesh) The upper coating film is treated and dried in a hot water tank to form a PVC base film with a thickness of 0.15mm; the pore size of the PVC base film is 0.01 micron; : 0.5 to prepare a uniform monomer mixed solution; soak the PVC base film in the monomer mixed solution, control the soaking temperature to 45°C, and the soaking time to 8h. The soaked PVC base film and the polyester protective film are stacked at intervals, pressed tightly and rolled up, and then polymerized at 90°C for 24 hours, and then peeled off the polyester protective film to obtain a roll-type homogeneous PVC ani...

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Abstract

The invention discloses a preparation method of a homogeneous PVC-based anion exchange membrane. The method includes the steps of: dissolving PVC in an organic solvent to form a PVC membrane casting solution, carrying out ultrasonic defoaming, then coating the membrane casting solution on a reinforced gridding cloth, and passing the membrane through a hot water tank to remove the organic solvent to obtain a continuous PVC-based membrane; preparing 1-vinylimidazole and an initiator into a uniform monomer mixed solution; subjecting the PVC-based membrane to absorption and impregnation of the monomer mixed solution under certain conditions, and then carrying out high-temperature polymerization on the PVC-based membrane subjected to monomer absorption and impregnation, thus obtaining the homogeneous PVC-based anion exchange membrane at the end of polymerization. According to the preparation method of the homogeneous PVC-based anion exchange membrane, active vinyl polymerization is carriedout to form a cross-linked structure of a PVC molecular chain, so that the membrane has low membrane resistance, high strength and good dimensional stability, also the membrane preparation process issimple, can achieve continuous roll production can be realized, meanwhile, the use of highly toxic chloromethyl ether is avoided, and the PVC raw materials are low in price and easily available.

Description

technical field [0001] The invention relates to the technical field of anion exchange membranes, in particular to a method for preparing a homogeneous PVC-based anion exchange membrane. Background technique [0002] Ion exchange membrane has unique ion exchange characteristics, which makes it play an increasingly important role in clean production, environmental protection, energy conversion, etc. The need for pollution control is also widely used in seawater desalination and other fields, and has become an important part of the sustainable economic development strategy. [0003] Chinese patent 201510347434.6 discloses a continuous production method for the production of polyvinyl chloride semi-homogeneous anion and cation exchange membranes. The method uses twin-screw extrusion to form a film, adheres mesh cloth on both sides of the film, and produces it through four-roll calendering. Rolls of polyvinyl chloride semi-homogeneous ion exchange membranes. The ion-exchange me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01J41/12
CPCB01D67/0002B01D67/0006B01D67/0013B01D69/02B01D2325/42B01J41/12
Inventor 王炳辉杨文龙吴法东徐守疆
Owner 海丝节水科技(天津)有限公司
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