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Chemical grating preparation method of partial fluorine-containing polymer based anion-exchange membrane

An anion exchange membrane and chemical grafting technology, which is applied in the field of chemical grafting preparation of some fluoropolymer-based anion exchange membranes, can solve the problems of difficult mass production, unstable functional groups, and high equipment requirements, and achieve easy Realize the effects of large-scale industrial production, convenient source of raw materials and simple operation

Inactive Publication Date: 2012-06-13
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The radiation grafting method has the advantages of no need for initiators and catalysts, and the grafting process is easy to control. However, this method requires a radiation source and requires high equipment conditions. It is only suitable for laboratory preparation and is not easy for large-scale production.
The plasma grafting method is easy to prepare polymers with high functionalization and high crosslinking on the surface. Its disadvantage is that the introduced functional groups are unstable, which affects the hydrophilicity of the membrane surface, and requires high equipment requirements.
The preparation process will initiate the basement membrane and the grafting monomer step by step, so that the grafting solution can be used multiple times. This method has good environmental protection and low cost. This research has not yet been publicly reported.

Method used

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  • Chemical grating preparation method of partial fluorine-containing polymer based anion-exchange membrane
  • Chemical grating preparation method of partial fluorine-containing polymer based anion-exchange membrane
  • Chemical grating preparation method of partial fluorine-containing polymer based anion-exchange membrane

Examples

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Effect test

Embodiment 1

[0042] Dissolve polyvinylidene fluoride powder in N,N-dimethylformamide solvent, stir to dissolve it, and prepare a solution with a mass percentage of 10% fluoropolymer to obtain a liquid film with a thickness of 1000μm. Completely degas and scrape the film; then dry at 40°C for 24 hours to obtain part of the fluoropolymer base film. Add 2mol / L NaOH ethanol solution to the three-necked flask, and add 3mg / ml n-tetrabutylammonium bromide (TBAB) phase transfer catalyst aqueous solution, added n-tetrabutylammonium bromide phase transfer catalyst aqueous solution and NaOH ethanol solution The volume ratio is 1:20. Under the protection of nitrogen, the part of the fluoropolymer base film is immersed in the mixed solution, and the alkali treatment is carried out at 50°C for 30 minutes to obtain the alkali treatment film; put the tetrahydrofuran solvent in a three-necked flask and add Initiator dibenzoyl peroxide, the initiator concentration is 1.7×10 -2 mg / ml, under the protection of ...

Embodiment 2

[0044] Dissolve polyvinylidene fluoride powder in N,N-dimethylformamide solvent, stir to dissolve it, prepare a solution with a mass percentage of fluoropolymer of 12%, and let it stand until it is completely degassed and scrape the film to obtain A liquid film with a thickness of 800μm; then dried at 100°C for 5h to obtain a part of the fluoropolymer base film. Add 5mol / L NaOH ethanol solution to the three-necked flask, and add 3mg / ml n-tetrabutylammonium bromide (TBAB) phase transfer catalyst aqueous solution, added n-tetrabutylammonium bromide phase transfer catalyst aqueous solution and NaOH ethanol solution The volume ratio is 1:20. Under the protection of nitrogen, this part of the fluoropolymer base film is immersed in the mixed solution, and the alkali treatment is carried out at 70°C for 5 minutes to obtain the alkali treatment film; put the tetrahydrofuran solvent in a three-necked flask and add Initiator dibenzoyl peroxide, make the initiator concentration 1mg / ml, un...

Embodiment 3

[0046] Dissolve the polyvinylidene fluoride powder in N,N-dimethylformamide solvent, stir to dissolve it, prepare a solution with a mass percentage of fluoropolymer of 11%, let it stand until it is completely degassed, and scrape the film to obtain A liquid film with a thickness of 600μm; then dried at 70°C for 9h to obtain a part of the fluoropolymer base film. Add 4mol / L NaOH ethanol solution into the three-necked flask, and add 3mg / ml n-tetrabutylammonium bromide (TBAB) phase transfer catalyst aqueous solution, added n-tetrabutylammonium bromide phase transfer catalyst aqueous solution and NaOH ethanol solution The volume ratio is 1:20. Under the protection of nitrogen, the part of the fluoropolymer base film is soaked in the mixed solution, and the alkali treatment is performed at 60°C for 20 minutes to obtain the alkali treatment film; take the tetrahydrofuran solvent into a three-necked flask and add Initiator dibenzoyl peroxide, make the initiator concentration 0.5mg / ml,...

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Abstract

The invention relates to a chemical grating preparation method of partial fluorine-containing polymer based anion-exchange membrane. The preparation method comprises the following steps of: firstly, preparing a partial fluorine-containing polymer based membrane or adding a partial fluorine-containing polymer hybridization base membrane of nano-montmorillonite; secondly, performing alkali treatment to the surface of the base membrane, initiating the alkali to treat the membrane, and grafting a monomer with a specific functional group; at last, performing quaternized treatment to the grafting membrane so as to obtain the anion-exchange membrane. The method, provided by the invention, has the advantages of simple preparation process and high efficiency, can avoid carcinogenic substances, such as chloromethyl methyl ether and the like which are applied in the regular preparation of the anion-exchange membrane, and is easy to realize the large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of anion-exchange membrane preparation, and in particular relates to a method for preparing a partially fluorine-containing polymer-based anion-exchange membrane by chemical grafting. Background technique [0002] Some fluoropolymers such as polyvinylidene fluoride (PVDF), polyethylene-tetrafluoroethylene copolymer (ETFE) and polyvinyl fluoride (PVF) have outstanding chemical stability, radiation resistance, pollution resistance and heat resistance Compared with perfluoropolymers, it is easier to synthesize and form films, and the cost is lower. Therefore, it is favored by many scientific researchers and has become a leader in the research of polymer membrane materials. So far, the methods for preparing ion exchange membranes from some fluoropolymers mainly include grafting and blending. Membrane blending is to blend part of the fluorine-containing polymer with other polymers with ion exchange function to o...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00B01J41/12
Inventor 田波李三喜刘倩李海啸
Owner SHENYANG POLYTECHNIC UNIV
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