Preparation method of crosslinking-type anion selective membrane

An anionic and selective technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of complex preparation process and low cross-linking degree, achieve hydrophobic cross-linked structure, low production cost, membrane mechanical and thermal High stability effect

Inactive Publication Date: 2018-05-18
SHANDONG TIANWEI MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anion-selective membranes are formed by blending chloromethylstyrene monomers in brominated polyphenylene ether solutions and undergoing polymerization and crosslinking reactions during film formation. The preparation process is complicated and expensive N-vinylimidazole is used. Or monomers such as chloromethyl styrene, and the heating process cannot fully polymerize the vinyl group, and the degree of crosslinking is low

Method used

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  • Preparation method of crosslinking-type anion selective membrane
  • Preparation method of crosslinking-type anion selective membrane
  • Preparation method of crosslinking-type anion selective membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 110 g of chlorobenzene into the three-necked flask, heat to 50°C, add 20 g of poly-2,6-dimethyl-1,4-phenylene ether, and stir; to be poly-2,6-dimethyl-1,4- After the phenyl ether is completely dissolved, add 26.7 g of bromine elemental substance, raise the temperature to 145°C and react for 8 hours; vacuum distill chlorobenzene from the solution at 110°C, and dry the remaining viscous material at 80°C to obtain bromomethylated poly-2,6 - Dimethyl-1,4-phenyl ether.

[0028] Bromomethylated poly-2,6-dimethyl-1,4-phenylene ether solid was dissolved in deuterated chloroform, and analyzed by nuclear magnetic resonance spectroscopy, bromomethylated poly-2,6-dimethyl-1,4-phenylene ether The benzene ring bromination degree of ether is 38%, and the methyl bromination degree is 56%.

Embodiment 2

[0030] Add 110 g of chlorobenzene into the three-necked flask, heat to 50°C, add 20 g of poly-2,6-dimethyl-1,4-phenylene ether, and stir; to be poly-2,6-dimethyl-1,4- After the phenyl ether is completely dissolved, add 44 g of N-bromosuccinimide; raise the temperature to 110°C, add 1 g of azobisisobutyronitrile; then raise the temperature to 145°C for 8 hours; pour the feed solution into the ethanol solution , the precipitated solid was bromomethylated poly-2,6-dimethyl-1,4-phenylene ether; the solid was dried at 80°C.

[0031] Bromomethylated poly-2,6-dimethyl-1,4-phenylene ether was dissolved in deuterated chloroform, and analyzed by nuclear magnetic resonance spectroscopy, bromomethylated poly-2,6-dimethyl-1,4-phenylene ether The degree of bromination of the benzene ring is 55%, and the degree of methyl bromination is 52%.

Embodiment 3

[0033] Add 110 g of chlorobenzene into the three-necked flask, heat to 50°C, add 20 g of poly-2,6-dimethyl-1,4-phenylene ether, and stir; to be poly-2,6-dimethyl-1,4- After the phenyl ether is completely dissolved, add 33g of N-bromosuccinimide; heat up to 110°C, add 1g of azobisisobutyronitrile; then heat up to 145°C for 8 hours; pour the feed solution into the ethanol solution, The precipitated solid was bromomethylated poly-2,6-dimethyl-1,4-phenylene ether; the solid was dried at 80°C.

[0034] Bromomethylated poly-2,6-dimethyl-1,4-phenylene ether solid was dissolved in deuterated chloroform, and analyzed by nuclear magnetic resonance spectroscopy, bromomethylated poly-2,6-dimethyl-1,4-phenylene ether The benzene ring bromination degree of ether is 35%, and the methyl bromination degree is 32%.

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Abstract

The invention relates to a preparation method of a crosslinking-type anion selective membrane. The method includes the steps of dissolving polybromomethyl-2,6-dimethyl-1,4-phenylate in an organic solvent, then adding unsaturated tertiary amine the molecular structure of which contains a carbon-carbon double bond, and making unsaturated tertiary amine subjected to a primary amination reaction withpartial bromomethyl; adding saturated tertiary amine to be subjected to a secondary amination reaction with remaining bromomethyl, and obtaining a reactant liquid after the reaction is completed; adding an oil-soluble initiator into the reactant liquid to obtain a membrane liquid; coating a base material with the membrane liquid, and heating and drying the base material to obtain a base membrane;placing and fully soaking the base membrane in a water solution in which a water-soluble oxidation-reduction initiator is dissolved, taking out the base membrane and cleaning the base membrane with water after soaking, and correspondingly obtaining the crosslinking-type anion selective membrane. The anion selective membrane prepared according to the method has the advantages that the production cost is low and the crosslinking degree can be adjusted according to demands, the crosslinking structure is lyophobic, and the membrane is high in mechanical and thermal stability and applicable to an application process of electrodialysis and diffusion dialysis.

Description

technical field [0001] The invention relates to a method for preparing an anion selective membrane, in particular to a polymer engineering plastic 2,6-dimethyl-1,4-phenylene ether (referred to as polyphenylene ether, polyphenylene ether in English) as the base material An anion-selective membrane containing a covalently cross-linked structure, which is suitable for diffusion dialysis and electrodialysis processes. Background technique [0002] Ion-selective membranes can be divided into anion-selective membranes (abbreviated as anion membranes) and cation-selective membranes (cation membranes); the polymer skeleton of the anion membrane is positively charged and can selectively pass through anions; Negative charge, able to selectively permeate cations. Based on the selective permeability of ion-selective membranes to ions, ion-selective membranes can realize the removal and concentration of salt, the separation of acid and salt, and the separation of alkali and salt during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D67/00B01D61/42B01D61/00C08G65/48
CPCB01D61/00B01D61/422B01D67/0006B01D71/82B01D2323/30B01D2323/36C08G65/485
Inventor 傅荣强张晓丽连文玉李晓玉刘兆明
Owner SHANDONG TIANWEI MEMBRANE TECH
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