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Main chain fluorocarbon alkali-resistant bipolar membrane and preparation method thereof

A bipolar membrane, fluorocarbon technology, applied in chemical instruments and methods, synthetic resin layered products, coatings, etc., can solve the problems of reducing the service life of bipolar membranes, easy to peel, etc., to achieve extended service life, strong resistance Alkaline, the effect of increasing the concentration of strong alkali resistance

Active Publication Date: 2022-05-17
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, because the existing bipolar membrane is composed of anion exchange membrane, cation exchange membrane and intermediate catalytic layer, the difference in physical and chemical properties between different layers makes it easy to peel off during use, thereby reducing the bipolar Membrane service life

Method used

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  • Main chain fluorocarbon alkali-resistant bipolar membrane and preparation method thereof
  • Main chain fluorocarbon alkali-resistant bipolar membrane and preparation method thereof
  • Main chain fluorocarbon alkali-resistant bipolar membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A main-chain fluorocarbon alkali-resistant bipolar membrane, including a cation-exchange membrane layer and an anion-exchange membrane layer. Both the cation-exchange membrane layer and the anion-exchange membrane layer use perfluorocarbon as the main chain; the chemical structural formula of the anion-exchange membrane layer is:

[0036]

[0037] The chemical structural formula of the cation exchange membrane layer is:

[0038]

[0039] The chemical structural formula of the intermediate interface layer catalyst is:

[0040]

[0041] Wherein, x is the degree of polymerization of the polychlorotrifluoroethylene main chain, n is the degree of polymerization of the side chain containing the sulfonic acid group substituent, m is the degree of polymerization of the side chain containing the imidazole substituent, and n and m are not zero integer.

Embodiment 2

[0043] A method for preparing a main-chain fluorocarbon alkali-resistant bipolar membrane, comprising the following steps:

[0044]S1, in the present embodiment, polychlorotrifluoroethylene is poly(vinylidene fluoride-trifluorochloroethylene), and preparing poly(vinylidene fluoride-trifluorochloroethylene) grafted polymethylstyrene copolymer is to prepare poly(vinylidene fluoride-trifluorochloroethylene) Vinyl chloride) grafted polymethylstyrene copolymer, its preparation method is as follows: take 2.0g poly(vinylidene fluoride-chlorotrifluorovinyl chloride) and add reaction container, after dissolving with 60mL N-methylpyrrolidone, nitrogen gas deoxygenation According to the molar ratio of 1:40:1:2, poly(vinylidene fluoride-chlorotrifluoroethylene), methylstyrene, CuBr and pentamethyldiethylenetriamine (PMDETA) were added sequentially, and then nitrogen was introduced Exhaust the air in the reaction vessel, repeat the vacuum / nitrogen step 3 times, CuBr and pentamethyldiethyle...

Embodiment 3

[0059] A method for preparing a main-chain fluorocarbon alkali-resistant bipolar membrane, comprising the following steps:

[0060] S1, poly(vinylidene fluoride-trifluorochloroethylene) grafted polymethylstyrene copolymer was obtained as described in Example 1; 10 g of prepared poly(vinylidene fluoride-trifluorochloroethylene) grafted Methylstyrene copolymer P(VDF-co-CTFE)-g-PMS is dissolved in 150mL chlorobenzene, then add 12.0g brominating agent NBS and 1.2g initiator AIBN, make it boil under the condition of heating and stirring Reflux for 4 hours, continue to react for 2 hours after the color change occurs, and then stop heating; precipitate in anhydrous methanol to obtain flocs, remove impurities and dry to obtain the final bromomethylated polymer P(VDF-co-CTFE)-g- BrPMSt;

[0061] S2. Dissolve 0.50 g of the bromomethylated polymer P(VDF-co-CTFE)-g-BrPMSt obtained in step S1 in 10 mL of N,N-dimethylacetamide or tetrahydrofuran, and slowly add 1.5 times of The molar equi...

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Abstract

The invention discloses a preparation method of a main chain fluorocarbon alkali-resistant bipolar membrane, and belongs to the field of electrically driven membranes. Both an anion exchange membrane layer and a cation exchange membrane layer in the prepared bipolar membrane take fluorocarbon chains as main chains, so that the defect that hydroxyl attacks carbon-oxygen bonds in a common main chain is overcome; meanwhile, the anion exchange membrane layer and the cation exchange membrane layer have similar physicochemical properties, so that the stripping possibility in the use process is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to a main-chain fluorocarbon acid-alkali bipolar membrane and a preparation method thereof, belonging to the technical field of electrically driven membranes. Background technique [0002] The bipolar membrane is a composite membrane material composed of an anion exchange membrane, a cation exchange membrane and an intermediate catalytic layer. Under the action of the electric field, the water molecules in the middle layer of the bipolar membrane undergo water dissociation to generate hydrogen ions and hydroxide ions, thereby achieving the purpose of generating acid and base. The theoretical potential of bipolar membrane water dissociation to produce acid and base is 0.828V, and the theoretical potential of electrolyzed water to produce acid and base is 2.057V. In addition, the water dissociation rate in the middle layer of the bipolar membrane is about 50 million times faster than that in general. Therefore, bipolar membrane te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B32B27/08B32B38/16C08F8/30C08F8/20C08F257/02C08J5/22C08L51/00
CPCB32B27/304B32B27/302B32B27/08B32B38/164C08J5/2293C08F8/30B32B2250/24B32B2255/10B32B2307/714C08J2351/00C08F8/20C08F257/02Y02E60/50
Inventor 陈日耀黄雪红金延超陈晓陶晴晴
Owner FUJIAN NORMAL UNIV
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