Preparation method of pressure-retarded permeation membrane modified by zwitterionic random copolymer

Abstract

The invention relates to a method for preparing a pressure retardation osmotic membrane modified by a zwitterionic random copolymer. N-vinylimidazole and N-vinylphthalimide monomer containing an amino protecting group are prepared in the form of methyl- 2‑[Methyl‑(4‑pyridine) dithiocarbonate] propionate is chain transfer agent, and azobisisobutyronitrile is random copolymerization as initiator; respectively in propane sultone and 4‑bromo Under the action of butyric acid, the poly-N-vinyl imidazole segment is quaternized; under the action of hydrazine hydrate, the poly-N-vinyl phthalimide segment is subjected to amino deprotection to prepare a zwitterionic polymer The above-mentioned zwitterionic polymer is configured as an aqueous solution and grafted and modified on the porous support layer of the permeable composite membrane. The comonomer used in the present invention is simple and easy to obtain, the random copolymer is convenient to synthesize, the condition is mild, and it is easy to realize; the chemical stability and water solubility of the grafted polymer are improved, and the cost is greatly reduced; it has excellent resistance to proteins and microorganisms Adhesion.

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...

AI Technical Summary

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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