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Terpolymer cross-linking agent and application thereof in preparation of special cationic membrane for diffusion dialysis

A terpolymer and cross-linking agent technology, applied in the direction of cation exchange materials, can solve the problems of excessive membrane expansion and limit the application of PVA-based membranes, and achieve improved performance, OH-dialysis coefficient and ion selectivity. Effect of swelling resistance and separation performance

Active Publication Date: 2019-11-22
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyvinyl alcohol (PVA) is a common hydrophilic polymer, which can provide a friendly membrane matrix for the transport of hydrated ions, but high hydrophilicity causes excessive swelling of the membrane during use, and PVA itself does not contain ion-exchange groups , both of which limit the application of PVA-based membranes in the separation process of diffusion dialysis (DD), it is urgent to develop cross-linking agents with anti-swelling properties and ion-exchange groups

Method used

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  • Terpolymer cross-linking agent and application thereof in preparation of special cationic membrane for diffusion dialysis
  • Terpolymer cross-linking agent and application thereof in preparation of special cationic membrane for diffusion dialysis
  • Terpolymer cross-linking agent and application thereof in preparation of special cationic membrane for diffusion dialysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of copolymer crosslinking agent

[0026] In a 250ml three-necked flask, feed sequentially: 140ml absolute ethanol; 7.6g (mol) acrylic acid, 0.73g (mol) vinyltriethoxysilane and 1.91g (mol) triacrylamidophenylboronic acid; add azobisiso 0.06575 g of butyronitrile, stirred evenly, passed nitrogen gas for 1 h, raised the temperature to 70° C., and kept the temperature for 24 h to obtain a copolymer crosslinking agent solution.

[0027] 2. Using the copolymer cross-linking agent prepared in step 1 to prepare a special cationic membrane for diffusion dialysis

[0028] (1) Add the copolymer cross-linking agent solution dropwise to the polyvinyl alcohol aqueous solution with a mass concentration of 5%, and stir and react at room temperature for 30 minutes; the mass ratio of polyvinyl alcohol to the copolymer cross-linking agent is 1:0.

[0029] (2) Place the reaction solution obtained in step (1) in a sealed place at room temperature, remove the air bubbles in ...

Embodiment 2

[0038]In this example, the copolymer crosslinking agent and the special cationic membrane for diffusion dialysis are prepared according to the same condition parameters as in Example A, and the same performance test is carried out on it, the difference lies in the mass ratio of polyvinyl alcohol and copolymer crosslinking agent in this example 1:0.005.

[0039] After testing, what the present embodiment obtains; The performance parameter of the special cationic membrane for diffusion dialysis is: the water content of membrane (W R ) is 149.9%, the ion exchange capacity is 0.0628mmol / g, OH - The dialysis coefficient U OH It is 0.0172m / h, and the separation coefficient is 29.5.

Embodiment 3

[0041] In this example, the copolymer crosslinking agent and the special cationic membrane for diffusion dialysis are prepared according to the same condition parameters as in Example A, and the same performance test is carried out on it, the difference lies in the mass ratio of polyvinyl alcohol and copolymer crosslinking agent in this example 1:0.01.

[0042] After testing, what the present embodiment obtains; The performance parameter of the special cationic membrane for diffusion dialysis is: the water content of membrane (W R ) is 148%, the ion exchange capacity is 0.0706mmol / g, OH - The dialysis coefficient U OH It is 0.0182m / h, and the separation coefficient is 36.9.

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Abstract

The invention discloses a terpolymer cross-linking agent and application of the terpolymer cross-linking agent in preparation of a special cationic membrane for diffusion dialysis. The preparation method comprises the following steps: dispersing acrylic acid, vinyltriethoxysilane and triacrylamido phenylboronic acid in absolute ethyl alcohol, adding an initiator azodiisobutyronitrile, carrying outa reaction for 24 hours at 70 DEG C under the protection of nitrogen to obtain a terpolymer solution, and removing the monomers through acetone precipitation to obtain the copolymer cross-linking agent. The copolymer cross-linking agent provided by the invention contains a large number of ion exchange groups, can endow the membrane with ion exchange capacity, and improves the separation effect ofthe membrane. The copolymer cross-linking agent is used for preparing a special cationic membrane for diffusion dialysis, so that the swelling resistance of a PVA-based membrane is improved.

Description

technical field [0001] The invention relates to a terpolymer cross-linking agent and its application in the preparation of a special cationic membrane for diffusion dialysis, belonging to the technical field of membranes. Background technique [0002] Polyvinyl alcohol (PVA) is a common hydrophilic polymer, which can provide a friendly membrane matrix for the transport of hydrated ions, but high hydrophilicity causes excessive swelling of the membrane during use, and PVA itself does not contain ion-exchange groups , both of which limit the application of PVA-based membranes in the separation process of diffusion dialysis (DD), and it is urgent to develop cross-linking agents with anti-swelling properties and ion-exchange groups. [0003] "Journal of Membrane Science" (Journal of Membrane Science 376 (2011) 233-240) reported that polyvinyl alcohol (PVA) was selected as the matrix, and acrylic acid and methacryloxypropyltrimethoxysilane were used as functional monomers. Organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F230/08C08F220/06C08F230/06C08J5/18C08L29/04C08L43/04B01J39/20
CPCB01J39/20C08F230/08C08J5/18C08J2329/04C08J2443/04C08F220/06C08F230/06
Inventor 苗继斌彭李珍钱家盛夏茹陈鹏杨斌曹明伍斌苏丽芬郑争志葛倩倩
Owner ANHUI UNIVERSITY
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