Preparation method of BPPO and PVA-based organic-inorganic hybrid anion exchange membrane

An anion-exchange membrane and hybrid technology, which is applied in the field of preparation of organic-inorganic hybrid anion-exchange membranes based on BPPO and PVA, can solve problems such as insufficient stability, insufficient cross-linking degree in the membrane, and strong hydrophilicity of PVA. , to achieve the effect of proper hydrophilicity, good flexibility and complete quaternization

Inactive Publication Date: 2012-10-03
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hybrid anion exchange membrane prepared by this method has appropriate ion exchange capacity and high separation efficiency for acids, but due to the strong hydrophilicity of PVA, the degree of crosslinking in the membrane is insufficient, resulting in insufficient stability of the membrane in aqueous solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, preparation of hybrid anion exchange membrane based on low PVA content, comprising the following steps:

[0023] (1) BPPO(+) / SiO 2 Preparation of materials: take 6 g of BPPO with a degree of bromination of 53.1%, dissolve it in chlorobenzene to form a solution with a concentration of 0.25 g / mL, and then add DMF to form a diluent with a concentration of 0.10 g / mL; add dropwise to the diluent 16 mL of trimethylamine / ethanol solution with a concentration of 0.2 g / mL was added dropwise for 0.5 h; the reaction was continued for 6 h at a temperature of 65 oC and under stirring conditions, and 0.78 g of tetraethoxysilane (TEOS), 0.90g of phenyltriethoxysilane (EPh) and 1.44g of water, continue to stir and react at a temperature of 65 oC for 12h, and coat the obtained sol-gel solution on a polytetrafluoroethylene plate, under a ventilated room temperature environment After drying for 1 day, 7.4 g of viscoelastic BPPO(+) / SiO was obtained 2 ;

[0024] (2) BPPO(+)...

Embodiment 2

[0042] Embodiment 2, the method for preparing the hybrid anion exchange membrane based on high PVA content, comprises the following steps:

[0043] (1) BPPO(+) / SiO 2 Material preparation: take 6 g of BPPO with a degree of bromination of 53.1%, dissolve it in chlorobenzene to form a solution with a concentration of 0.2 g / mL, and then add DMF to form a diluent with a concentration of 0.075 g / mL. 10 mL of trimethylamine / ethanol solution with a concentration of 0.3 g / mL was added dropwise to the diluent for 1 h, and the reaction was carried out at a temperature of 25 oC and stirring for 16 h, and then 1.17 g of tetraethoxysilane, 1.17 g of tetraethoxysilane, 1.17g of methyltriethoxysilane and 2.88g of water, continue to stir and react for 24h at a temperature of 25 oC, coat the obtained sol-gel solution on a plastic film, and dry it in a ventilated room temperature environment for 3 days to obtain 7.8 g dried BPPO(+) / SiO 2 ;

[0044] (2) BPPO(+) / SiO 2 Configuration of solution...

Embodiment 3

[0054] Embodiment 3, the method for preparing the hybrid anion exchange membrane based on low molecular weight alkoxysilane content, comprises the following steps:

[0055] (1) BPPO(+) / SiO 2 Material preparation: Take 6 g of BPPO with a bromination degree of 56.0%, dissolve it in chlorobenzene to form a solution with a concentration of 0.30 g / mL, and then add DMF to form a diluent with a concentration of 0.12 g / mL. Triethylamine / ethanol solution with a concentration of 0.2 g / mL and a volume of 20 mL was added dropwise to the diluent for 2 h, and the reaction was stirred at a temperature of 40 oC for 10 h, and then 0.34 g of tetramethoxyl was added to the solution. Silane (TMOS), 0.56g γ-methacryloyloxypropyltrimethoxysilane (KH-570) and 0.9g water, continue to stir and react for 16h at a temperature of 40 oC, and coat the obtained sol-gel solution with Covered on a polyvinyl chloride board and dried in a ventilated natural environment for 2 days to obtain 8.0g of dry BPPO(+) / ...

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Abstract

The invention discloses a preparation method of a BPPO (Brominated Polystyrene) and PVA (Polyvinyl Alcohol)-based organic-inorganic hybrid anion exchange membrane. The preparation method comprises the following steps: (1), dissolving the BPPO in chlorobenzene, and adding DMF (Dimethyl Formamide), tertiary amine solution, two micromolecule alkoxy silanes and water so as to obtain BPPO (+)/SiO2 materials; (2) dissolving the obtained BPPO (+)/SiO2 materials into DMF mixed solution so as to BPPO (+)/SiO2 solution; (3) dropping the BPPO (+)/SiO2 solution into PVA solution so as to prepare coating liquid; and (4) coating the coating liquid on a basal body so as to form a diaphragm, and drying the diaphragm to obtain the organic-inorganic hybrid anion exchange membrane. According to the invention, quaternary ammonium BPPO, PVA and micromolecule alkoxy silanes are utilized to prepare the hybrid anion exchange membrane containing the quaternary ammonium group and-OH base, the content of the PVA in the membrane can be controlled, and a cross-linked structure can be formed, so that the stability and mechanical performance of the membrane can be reinforced; and moreover, the -OH base in the PVA can promote the H+ ion to transfer, so that the prepared hybrid anion exchange membrane is particularly suitable for diffusion dialysis process, and can separate and recycle acid waste liquid.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a method for preparing an organic-inorganic hybrid anion exchange membrane based on benzyl brominated polyphenylene oxide (BPPO) and polyvinyl alcohol (PVA) by a blending method. Background technique [0002] Organic-inorganic hybrid anion exchange membranes contain anion exchange groups and have the function of selective permeability to ions, and are used in nanofiltration, fuel cells, diffusion dialysis and other fields. The preparation of existing hybrid anion exchange membranes is mainly to perform functionalization and sol-gel reaction on a single polymer, but there are always some shortcomings, such as: [0003] Chinese patent 200410065737.8 discloses a preparation method of an organic-inorganic hybrid anion exchange membrane, which uses the benzyl bromide group contained in BPPO, and a part of it is grafted with -NH 2 A part of the silane was subjected to qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/52B01D71/38B01D67/00C08J5/22C08L71/12C08L29/04C08K3/36
Inventor 吴永会张根成茆福林
Owner YANCHENG TEACHERS UNIV
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