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Modified poly-m-phenylene isophthalamide ultrafiltration membrane and 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: 2022-07-19
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 poly-m-phenylene isophthalamide ultrafiltration membrane and preparation method and application thereof
  • Modified poly-m-phenylene isophthalamide ultrafiltration membrane and preparation method and application thereof
  • Modified poly-m-phenylene isophthalamide ultrafiltration membrane and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] At room temperature, 5 wt. % lithium chloride and 82.5 wt. % DMAc solvent were mixed and dissolved with high-speed stirring to form a transparent homogeneous solution. Add 0.5wt.% of Pluronic F127 to the transparent homogeneous solution and continue to stir until it dissolves into a uniform and stable mixed solution, then add 12wt.% of PMIA to the mixed solution, and stir at a high speed at 45 ℃ to fully dissolve, After a uniform and stable casting solution is formed, the temperature is lowered to 25°C and left to stand for defoaming. After the defoaming is completed, 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 scraping the film, stay in the air with a humidity of 10%-80% for 5-60 seconds, and then The new PMIA flat membrane was immersed in a sodium sulfate salt solution at a temper...

Embodiment 2

[0059] At room temperature, 5 wt.% lithium chloride and 82.0 wt.% DMAc solvent were mixed and dissolved with high-speed stirring to form a transparent homogeneous solution. Add 1.0wt.% of Pluronic F127 to the transparent homogeneous solution and continue to stir until it dissolves into a uniform and stable mixed solution, then add 12wt.% of PMIA to the mixed solution and stir at 85°C to fully dissolve at high speed. After a uniform and stable casting solution is formed, the temperature is lowered to 25°C and left to stand for defoaming. After the defoaming is completed, 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 scraping the film, stay in the air with a humidity of 10%-80% for 5-60 seconds, and then The nascent PMIA flat membrane was immersed in a saturated sodium chloride solution at a t...

Embodiment 3

[0062] At room temperature, 5 wt.% lithium chloride and 81.5 wt.% DMAc solvent were mixed and dissolved with high-speed stirring to form a transparent homogeneous solution. Add 1.5wt.% of Pluronic F127 to the transparent homogeneous solution and continue to stir until it dissolves into a uniform and stable mixed solution, then add 12wt.% of PMIA to the mixed solution, and stir at 85°C to fully dissolve at high speed. After a uniform and stable casting solution is formed, the temperature is lowered to 25°C and left to stand for defoaming. After the defoaming is completed, 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 scraping the film, stay in the air with a humidity of 10%-80% for 5-60 seconds, and then The nascent PMIA flat membrane was immersed in a saturated sodium chloride solution at a ...

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Abstract

The invention discloses a modified poly-m-phenylene isophthalamide ultrafiltration membrane and a preparation method and application thereof. The ultrafiltration membrane adopts an amphiphilic block copolymer as an additive, and is prepared by a non-solvent induced phase inversion method. Therefore, the membrane has a uniform, smooth and porous surface morphology, and is a new type of ultrafiltration membrane; the additive can effectively increase the pore size and surface porosity, enhance the connectivity between the pores, and give the ultrafiltration membrane higher performance. At the same time, the modifier enhances the hydrophilicity and intermolecular forces of the membrane, thereby significantly improving the fouling resistance and stability of the membrane. It has been verified that the interception rate of pollutants is kept above 90%, and the flux recovery rate is as high as 80%, which has good application prospects in water purification and wastewater treatment.

Description

technical field [0001] The invention relates to an ultrafiltration membrane, in particular to a modified polymetaphenylene isophthalamide ultrafiltration membrane and a preparation method and application thereof, and belongs to the technical field of new materials. Background technique [0002] At present, the rapid development of society and economy and the excessive discharge of industrial production wastewater have caused serious shortage of water resources and water pollution, which seriously threatens the ecological environment and human health. As a new, green and efficient separation technology, membrane technology has received extensive attention in the field 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, papermaki...

Claims

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Application Information

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Patent Type & Authority Patents(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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