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Method for preparing pressure retarded osmosis membrane modified by zwitterionic random copolymer

A random copolymer, zwitterion technology, applied in the field of membrane separation, can solve the problems of high price of zwitterionic small molecule monomers, expensive phosphorylcholine monomers, complicated preparation methods, etc., and achieve excellent resistance to protein and microbial adhesion. The effect of adhesion, improving chemical stability and water solubility, and convenient synthesis

Active Publication Date: 2019-10-22
SHENZHEN RES INST OF WUHAN UNIVERISTY
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Problems solved by technology

The surface modification of permeable membranes with zwitterions has been reported (Journal of Membrane Science, 497, 2016, 142-152; Journal of Membrane Science, 449, 2014, 50-57;) The shortcoming is that it is necessary to synthesize various zwitterionic small molecules. body, the preparation method is complicated, resulting in high price of zwitterionic small molecule monomers, especially phosphorylcholine monomers are very expensive and not practical

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  • Method for preparing pressure retarded osmosis membrane modified by zwitterionic random copolymer
  • Method for preparing pressure retarded osmosis membrane modified by zwitterionic random copolymer
  • Method for preparing pressure retarded osmosis membrane modified by zwitterionic random copolymer

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Embodiment Construction

[0050] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0051] A method for preparing a pressure-retarded osmotic membrane modified by a zwitterionic random copolymer, comprising the following steps:

[0052] Preparation of step S1 zwitterionic random copolymer:

[0053] S1.1 N-vinylimidazole and N-vinylphthalimide monomer containing amino protecting group, the mass ratio of the two is 10.36:1, and methyl-2-[methyl-(4 -pyridine) dithiocarbonate] propionate (MMP) as chain transfer agent, azobisisobutyronitrile (AIBN) as initiator, random addition-fragmentation chain transfer free radical polymerization copolymeri...

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Abstract

The invention relates to a method for preparing a pressure retarded osmosis membrane modified by a zwitterionic random copolymer. The method comprises the steps that methyl-2-[methyl-(4-pyridine)dithiocarbonate]propionate is used as a chain transfer agent, azobisisobutyronitrile is used as an initiator, N-vinylimidazole and an N-vinylphthalimide monomer containing an amino protecting group are subjected to random copolymerization; a poly N-vinylimidazole chain segment is subjected to quaternization under the action of propane sultone and 4-bromobutyric acid separately; under the action of hydrazine hydrate, a poly(N-vinylphthalimide)chain segment is subjected to amino deprotection to obtain a zwitterionic polymer; and the zwitterionic polymer is prepared into an aqueous solution to be grafted and modified on a porous support layer of an osmosis composite membrane. A comonomer used in the method is simple and easy to obtain, the random copolymer is convenient to synthesize, the condition is mild, and realization is easy; the chemical stability and water solubility of a graft polymer are improved, and the cost is greatly reduced; and excellent anti-protein and microbial adhesion areachieved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a pressure-retarded osmotic membrane modified by a zwitterionic random copolymer. Background technique [0002] Functional polymer-modified polymer composite membranes can combine the advantages of stable structure and performance of the polymer membrane body and various functions on the surface of the modified layer, and gradually become the frontier in the field of membranes and membrane processes. The application of polymer composite membranes in pressure-delayed osmotic power generation has become a research hotspot in the world in recent years. [0003] Pressure-delayed osmosis power generation is a new technology based on membrane separation. Its essence is to use natural osmotic phenomena for energy development. It has great potential and has become a new energy research hotspot in recent years. Two solutions with concentration differenc...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/10B01D69/12B01D71/66
CPCB01D67/0006B01D69/10B01D69/12B01D71/66
Inventor 李雪蔡韬黄文刚李家乐
Owner SHENZHEN RES INST OF WUHAN UNIVERISTY
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