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Ultrahigh-flux nanofiber filtering membrane and preparation method thereof

A nanofiber and filtration membrane technology, applied in the field of ultra-high flux nanofiber filtration membrane and its preparation, can solve the problem of small diameter of spinning fiber, poor mechanical properties of nanofiber filtration membrane, flux loss of nanofiber filtration membrane, etc. problems, to achieve the effect of improving mechanical properties, improving hydrophilic properties, and increasing strength

Active Publication Date: 2020-03-31
HANGZHOU DEEFINE FILTRATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the small diameter of the spun fiber, the mechanical properties of the nanofiber filter membrane are poor, which is one of the factors hindering its wide application. At present, most of the commercially available nanofiber filter membranes use nanofiber spinning The method on the substrate is used to solve this problem, and most of them use an adhesive to bond or heat press the nanofiber to the substrate, and the use of the adhesive will block the filter pores of the nanofiber. The way of hot pressing will destroy the structure of nanofibers, causing adhesion between nanofibers, which will cause a great loss in the flux of nanofiber filtration membranes.

Method used

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  • Ultrahigh-flux nanofiber filtering membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The fiber-forming polymer of the nanofiber filter membrane in this embodiment is polyvinylidene fluoride; the specific preparation steps are as follows:

[0030] Preparation of additive mixture:

[0031] According to the mass ratio of 3:2:1, take anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous sodium chloride respectively, stir and mix them evenly and add them to N,N-dimethylformamide. Under the ultrasonic condition of 25kHz, carry out high-speed rotation dissolution of 2400-3000r / min until the solid is completely dissolved to obtain an additive mixture. In the additive mixture, anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous sodium chloride The total mass fraction is 1%.

[0032] Spinning solution preparation:

[0033] (1) Measure N,N-dimethylformamide and N,N-dimethylacetamide respectively according to the volume ratio of 8:2, stir and mix them evenly to obtain a formacetamide mixed solution.

[0034] (2) According to t...

Embodiment 2

[0043] The fiber-forming polymer of the nanofiber filtration membrane in this embodiment is polyethersulfone; the specific preparation steps are as follows:

[0044]Preparation of additive mixture:

[0045] According to the mass ratio of 3:2:1, take anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous sodium chloride respectively, stir and mix them evenly and add them to N,N-dimethylformamide. Under the ultrasonic condition of 25kHz, carry out high-speed rotation dissolution of 2400-3000r / min until the solid is completely dissolved to obtain an additive mixture. In the additive mixture, anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous sodium chloride The total mass fraction is 1.5%.

[0046] Spinning solution preparation:

[0047] (1) According to the volume ratio of 7.9:2.1, N,N-dimethylformamide and N,N-dimethylacetamide were respectively measured, stirred and mixed evenly to obtain a formacetamide mixed solution.

[0048] (2) Accor...

Embodiment 3

[0056] The fiber-forming polymer of the nanofiber filter membrane of this embodiment is polyacrylonitrile; the specific preparation steps are as follows:

[0057] Preparation of additive mixture:

[0058] According to the mass ratio of 3:2:1, take anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous sodium chloride respectively, stir and mix them evenly and add them to N,N-dimethylformamide. Under the ultrasonic condition of 25kHz, carry out high-speed rotation dissolution of 2400-3000r / min until the solid is completely dissolved to obtain an additive mixture. In the additive mixture, anhydrous calcium chloride, anhydrous magnesium chloride and anhydrous sodium chloride The total mass fraction is 2%.

[0059] Spinning solution preparation:

[0060] (1) Measure N,N-dimethylformamide and N,N-dimethylacetamide respectively according to the volume ratio of 7:3, stir and mix them evenly to obtain a formacetamide mixed solution.

[0061] (2) According to the vol...

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Abstract

The invention discloses an ultrahigh-flux nanofiber filtering membrane and a preparation method thereof, and relates to the technical field of nanofiber filtering membranes. The preparation method specifically comprises the following steps: adding an additive mixed solution into a spinning raw solution, and uniformly mixing to obtain a spinning solution; carrying out electrostatic spinning on thespinning solution to obtain a nanofiber filtering membrane crude product; and placing the nanofiber filtering membrane crude product in a stenter, and carrying out post-treatment to obtain the ultrahigh-flux nanofiber filtering membrane. According to the invention, the gas filtering flux of the ultrahigh-flux nanofiber filtering membrane prepared through the method is 2-3 times the gas filtering flux of the normally spun nanofiber filtering membrane, and the filtering efficiency reaches more than 99.5%.

Description

technical field [0001] The invention relates to the technical field of nanofiber filtration membranes, in particular to an ultra-high flux nanofiber filtration membrane and a preparation method thereof. Background technique [0002] With the development of modern science and technology, the level of industrialization has been continuously improved, and people's awareness of environmental protection has gradually strengthened. The demand for filter materials in the world has increased year by year, and higher requirements have been put forward for the purification industry. Membrane separation technology is one of the high-tech industries in the 21st century. Due to its characteristics of operation at room temperature, no phase change, high efficiency and energy saving, and no pollution in the production process, it is widely used in drinking water purification, industrial water treatment, food and beverage water It is widely used in purification, sterilization, recovery and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D46/54
CPCB01D69/02B01D67/0079B01D46/0001B01D46/543B01D46/546B01D2325/40B01D2325/24Y02W10/10
Inventor 李圣泉王文富冯建永
Owner HANGZHOU DEEFINE FILTRATION TECH
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