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Modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane as well as preparation method and application thereof

A poly-m-phenylene isophthalamide, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problem of membrane anti-pollution level decline, precipitation and leakage of water safety threats, membrane affinity Water quality reduction and other issues to achieve the effect of inhibiting leakage trend, high retention capacity and permeability, and enhanced connectivity

Active Publication Date: 2021-12-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned additives all have a serious precipitation problem (the tendency to leach from the membrane matrix), which will cause a decrease in the hydrophilicity of the membrane, resulting in a decrease in the anti-fouling level of the membrane, and the precipitation and leakage of additives will pose a threat to water safety.

Method used

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  • Modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane as well as preparation method and application thereof
  • Modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane as well as preparation method and application thereof
  • Modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] At room temperature, 5wt.% lithium chloride and 82.5wt.% DMAc solvent were mixed and stirred at high speed to form a transparent homogeneous solution. Add 0.5wt.% Pluronic F127 to the transparent homogeneous solution and continue to stir until it dissolves into a uniform and stable mixed solution, then add 12wt.% PMIA to the mixed solution, stir at 45°C to fully dissolve, After forming a uniform and stable casting solution, lower the temperature to 25°C and let it stand for defoaming. After defoaming is complete, the membrane is formed by a non-solvent-induced phase separation method.

[0057] The specific film forming method is: use a glass rod to scrape the film on a smooth flat glass plate, the thickness is controlled at 200 microns, after the scraping is completed, stay in the air with a humidity of 10%-80% for 5-60 seconds, and then put The new PMIA flat film is immersed in a sodium sulfate salt solution with a temperature of 25°C for coagulation bath, and then th...

Embodiment 2

[0059] At room temperature, 5wt.% lithium chloride and 82.0wt.% DMAc solvent were mixed and stirred at high speed to form a transparent homogeneous solution. Add 1.0wt.% Pluronic F127 to the transparent homogeneous solution and continue to stir until it dissolves into a uniform and stable mixed solution, then add 12wt.% PMIA to the mixed solution, stir at 85°C to fully dissolve, After forming a uniform and stable casting solution, lower the temperature to 25°C and let it stand for defoaming. After defoaming is complete, the membrane is formed by a non-solvent-induced phase separation method.

[0060] The specific film forming method is: use a glass rod to scrape the film on a smooth flat glass plate, the thickness is controlled at 200 microns, after the scraping is completed, stay in the air with a humidity of 10%-80% for 5-60 seconds, and then put Immerse the new PMIA flat film at a temperature of 25°C in a saturated sodium chloride solution for coagulation bath, then wash t...

Embodiment 3

[0062] At room temperature, 5wt.% lithium chloride and 81.5wt.% DMAc solvent were mixed and stirred at high speed to form a transparent homogeneous solution. Add 1.5wt.% Pluronic F127 to the transparent homogeneous solution and continue to stir until it dissolves into a uniform and stable mixed solution, then add 12wt.% PMIA to the mixed solution, and stir at 85°C to fully dissolve. After forming a uniform and stable casting solution, lower the temperature to 25°C and let it stand for defoaming. After defoaming is complete, the membrane is formed by a non-solvent-induced phase separation method.

[0063] The specific film forming method is: use a glass rod to scrape the film on a smooth flat glass plate, the thickness is controlled at 200 microns, after the scraping is completed, stay in the air with a humidity of 10%-80% for 5-60 seconds, and then put Immerse the new PMIA flat film at a temperature of 25°C in a saturated sodium chloride solution for coagulation bath, then wa...

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Abstract

The invention discloses a modified polyisophthaloyl metaphenylene diamine ultrafiltration membrane as well as a preparation method and application thereof. The ultrafiltration membrane is prepared by adopting an amphiphilic block copolymer as an additive and adopting a non-solvent induced phase inversion method. The membrane has a uniform, smooth and porous surface morphology and is a novel ultrafiltration membrane; the additive can effectively increase the pore diameter and the surface porosity of the membrane , enhance connectivity between pores and endow the ultrafiltration membrane with higher interception capacity and permeability; and meanwhile, the modifier enhances the hydrophilicity and intermolecular force of the membrane, so the pollution resistance and the stability of the membrane are remarkably improved. Verification results show that the retention rate of pollutants is kept at 90% or above, a flux recovery rate is as high as 80% or above, and the membrane has good application prospects in the aspects of water purification and wastewater treatment.

Description

technical field [0001] The invention relates to an ultrafiltration membrane, in particular to a modified polym-phenylene isophthalamide ultrafiltration membrane and its preparation method and application; it belongs to the technical field of new materials. Background technique [0002] At present, the rapid development of social economy and excessive discharge of industrial production wastewater have caused serious shortage of water resources and water pollution, seriously threatening the ecological environment and human health. As a new, green and efficient separation technology, membrane technology has received extensive attention in the fields of wastewater treatment and water purification. In particular, ultrafiltration (UF) technology, as a long-term leading separation technology, has the advantages of high efficiency, safety and economy, and has been widely used in wastewater treatment in drinking water purification, food, pharmaceutical, paper and other industries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/56B01D71/80C02F1/44
CPCB01D61/145B01D71/56B01D71/80B01D67/0011B01D67/0009B01D69/02C02F1/444B01D2325/36
Inventor 王涛张璐瑶郑喜赵珍珍赵之平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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