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Preparation method of QAS polymer anion exchange membrane

An anion-exchange membrane and polymer technology, applied in the field of ion-exchange membranes, can solve the problems of anion-exchange membrane performance degradation, strong volatility, and environmental pollution, achieve good mechanical properties and chemical stability, and avoid hazards

Inactive Publication Date: 2010-10-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction reagents of the chloromethylation route, such as chloromethyl ether, have a strong carcinogenic effect. As early as 1967, they were listed as banned reagents in factories internationally, and the compounds such as formaldehyde and methyl ether produced by the chloromethylation reaction are toxic. Large, highly volatile, seriously polluting the environment
In addition, the chloromethylation reaction is accompanied by side reactions such as cross-linking of methylene groups, which leads to a decrease in the performance of the anion exchange membrane.

Method used

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  • Preparation method of QAS polymer anion exchange membrane
  • Preparation method of QAS polymer anion exchange membrane
  • Preparation method of QAS polymer anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Add methyl methacrylate, vinyl benzyl chloride, toluene and azobisisobutyronitrile (wherein methyl methacrylate and vinyl benzyl chloride are mixed in a volume ratio of 1:1) in a three-necked flask, Under the protection of nitrogen, heat to 45° C. for reflux reaction for 5 h, the product is precipitated with methanol, washed and dried to obtain a chloromethyl-containing copolymer.

[0023] 2) Dissolve the copolymer in tetrahydrofuran, let it stand for degassing, and obtain 5% casting solution, cast the casting solution on a glass plate, dry it at 60-70°C for 8 hours, and put it into deionized water after cooling for immersion Until the film falls off the glass plate, the film is then air-dried naturally.

[0024] 3) Soak the membrane in an aqueous solution of triethylamine for 10 h at room temperature, and rinse it with deionized water several times until neutral.

[0025] 4) The membrane was immersed in 1M hydrochloric acid aqueous solution for 24 hours, and then r...

Embodiment 2

[0027] 1) Add methyl methacrylate, ethyl methacrylate, vinyl benzyl chloride, toluene and azobisisobutyronitrile (wherein methyl methacrylate, ethyl methacrylate, vinyl benzyl The volume ratio of chlorine is 2:2:5). Under the protection of nitrogen, it was heated to 65° C. for reflux reaction for 20 h, and the product was precipitated with methanol, washed and dried to obtain a chloromethyl-containing copolymer.

[0028] 2) Dissolve the copolymer in N,N-dimethylformamide, let it stand for defoaming, and obtain a 6% casting solution, cast the casting solution on a glass plate, and dry it at 60-70°C for 8 hours, After cooling, soak in deionized water until the film falls off the glass plate, and then air-dry the film naturally.

[0029] 3) Soak the membrane in an aqueous solution of trimethylamine for 8 hours at room temperature, and rinse with deionized water several times until neutral. 4) Dip the film in 1M hydrochloric acid aqueous solution for 24 hours, rinse it with deio...

Embodiment 3

[0031] 1) Add butyl methacrylate, vinylbenzyl chloride, toluene and benzoyl peroxide (wherein butyl methacrylate and chloromethyl styrene are mixed in a volume ratio of 1:0.8) in a three-necked flask. Under the protection of nitrogen, it was heated to 80° C. for reflux reaction for 20 h, and the product was precipitated with methanol, washed and dried to obtain a chloromethyl-containing copolymer.

[0032] 2) Dissolve the copolymer in N,N-dimethylacetamide, let it stand for defoaming, and obtain a 10% casting solution, cast the casting solution on a glass plate, and dry it at 60-70°C for 8 hours, After cooling, soak in deionized water until the film falls off the glass plate, and then air-dry the film naturally.

[0033] 3) Soak the membrane in an aqueous solution of triethylamine for 10 h at room temperature, and rinse it with deionized water several times until neutral.

[0034] 4) The membrane was immersed in 1M hydrochloric acid aqueous solution for 24 hours, and then rin...

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Abstract

A preparation method of a QAS polymer anion exchange membrane relates to an ion exchange membrane, which provides a preparation method of a QAS polymer anion exchange membrane. The reaction process has no obvious harm on human body and environment. The prepared anion exchange membrane has high electrical conductivity and good mechanical performance. Monomer, solvent and evocating agent are added into a reactor. Reflowing reaction is carried out under the protection of inert gas. The obtained copolymer is deposited in methyl alcohol, washed and dried for standby. The copolymer is dissolved in the organic solvent to prepare polymer solution which is cast into the membrane with a phase inversion method and is dried for standby. The cast membrane is dipped in low-grade tertiary amine water solution, quaternized, and washed to obtain the QAS anion exchange membrane. If the membrane is dipped in hydrochloric acid water solution, a chloride anion exchange membrane is obtained and if the membrane is dipped in potassium hydroxide water solution, an oxyhydrogen anion exchange membrane is obtained.

Description

technical field [0001] The invention relates to an ion exchange membrane, in particular to a preparation method of a quaternary ammonium salt polymer anion exchange membrane. Background technique [0002] Anion exchange membranes are widely used in water treatment, purification, concentration, and separation of substances, chlor-alkali industry, heavy metal recovery, alkaline anion exchange membrane fuel cells, liquid flow energy storage batteries, and new supercapacitors. Anion exchange membranes generally consist of a polymer matrix, positively charged active groups, and movable anions (counter ions) on the active groups. According to the strength of ionization of active groups, it can be divided into strong base anion exchange membrane and weak base anion exchange membrane. Among them, the active group of strong base anion exchange membrane is generally quaternary ammonium base [such as: -N+(CH3)3, etc.], and the active group of weak base anion exchange membrane is gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/40C08J7/12C08L25/18
Inventor 方军徐汉坤郭明俐
Owner XIAMEN UNIV
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