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Nano-fiber composite ultrafiltration membrane preparation method based on electrostatic spinning technology

An electrospinning technology, a nanofiber technology, is applied in the field of preparation of nanofiber composite ultrafiltration membranes, which can solve the problems of limiting the flux and retention rate of the filtration membrane, low porosity, and large pore size on the membrane surface, and achieves wide industrial application. , the effect of high water flux and retention rate, good pollution resistance

Active Publication Date: 2013-11-13
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional filter membranes are usually made of a single material, with relatively low porosity, large surface pore size, and basically closed-pore structure, which greatly limit the flux and rejection rate of the filter membrane.

Method used

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  • Nano-fiber composite ultrafiltration membrane preparation method based on electrostatic spinning technology
  • Nano-fiber composite ultrafiltration membrane preparation method based on electrostatic spinning technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh a certain amount of PET and dissolve it in a mixed solution of trifluoroacetic acid (TFA) / dichloromethane (DMC) (4:1 (v:v)) to make a solution with a concentration of 20wt%, and let it stand After completely dissolving, stir it with magnetic force for one hour to obtain PET spinning solution (spinning solution A) for use.

[0034] (2) Prepare a PVA aqueous solution with a mass fraction of 7%, fully swell for 24 hours, and then heat in a water bath for 3 hours. Cool to room temperature to obtain PVA spinning solution; in addition, prepare a uniform PVA aqueous solution with a mass fraction of 1%, and then process it with a glutaraldehyde crosslinking agent, that is, add glutaraldehyde and make its content in the PVA solution be 1wt%, to obtain a PVA coating solution, wherein the content of glutaraldehyde is 1wt%.

[0035] (3) Add the prepared PET spinning solution to one nozzle, and PVA spinning solution to another nozzle to perform composite electrospinning t...

Embodiment 2

[0041] (1) Weigh a certain amount of PET and dissolve it in a mixed solution of trifluoroacetic acid (TFA) / dichloromethane (DCM) (2:1 (v:v)) to make a solution with a concentration of 25wt%, and let it stand for After complete dissolution, magnetically stir for two hours and set aside.

[0042] (2) Prepare a PVA aqueous solution with a mass fraction of 7wt%, fully swell for 24 hours, and then heat in a water bath for 5 hours. Cool to room temperature to obtain a PVA spinning solution; in addition, prepare a uniform PVA aqueous solution with a mass fraction of 2%, and process it with a glutaraldehyde crosslinking agent to obtain a PVA coating solution, wherein the content of glutaraldehyde is 1wt%.

[0043] (3) Put the prepared PET spinning solution (spinning solution A) into one nozzle, and PVA spinning solution into another nozzle to perform composite electrospinning to obtain a nanofiber composite film. The basic parameters of electrospinning are: : Voltage 19kV, nozzle ape...

Embodiment 3

[0048] (1) Prepare a trifluoroacetic acid (TFA) solution with a mass fraction of 28% of PET, let it stand until it is completely dissolved, and then stir it magnetically for one hour to obtain a PET spinning solution (spinning solution A).

[0049] (2) Prepare a PVA aqueous solution with a mass fraction of 8%, fully swell for 24 hours, and then heat in a water bath for 3 hours. Cool to room temperature to obtain PVA spinning solution; in addition, it is formulated into a uniform PVA aqueous solution with a mass fraction of 2%, and treated with a terephthalaldehyde crosslinking agent to obtain a PVA coating solution, wherein the content of terephthalaldehyde is 1wt%.

[0050] (3) Add the prepared PET spinning solution to one nozzle, and PVA spinning solution to another nozzle to perform composite electrospinning to obtain a nanofiber composite film. The basic parameters of electrospinning are: voltage 20kV, nozzle aperture 0.8mm, the flow rate of spinning solution (spinning so...

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Abstract

The invention relates to a nano-fiber composite ultrafiltration membrane preparation method based on an electrostatic spinning technology. According to the invention, a high-molecular polymer used for spinning is dissolved in a solvent, such that a spinning solution A with a concentration of 10-30wt% is obtained; a PVA spinning solution with a mass percentage of 7-10% is prepared; a PVA water solution with a mass concentration of 1-6% is prepared; through crosslinking treatment, a PVA coating liquid is obtained; the spinning solution A and the PVA spinning solution is subjected to composite electrostatic spinning, such that a nano-fiber composite membrane is obtained; the membrane is processed under water vapor, and is soaked with a crosslinking bath; the PVA coating liquid is used for coating by using a spin coater; a sealed reaction is carried out under room temperature; the membrane is soaked by using deionized water, and is suspended and air-dried, such that the ultrafiltration membrane is obtained. The surface of the prepared nano-fiber composite ultrafiltration membrane comprises large amounts of hydrophilic groups and active groups. The membrane has good mechanical performances and anti-pollution performances, and is especially suitable for ultrafiltration under ultra-low pressure or even no power. The membrane has high flux and retention rate under low pressure.

Description

technical field [0001] The invention relates to a method for preparing a nanofiber composite ultrafiltration membrane based on the electrospinning technology. The nanofiber composite ultrafiltration membrane is prepared by the electrospinning technology, and belongs to the field of polymer filtration membranes. Background technique [0002] At present, the main methods for preparing nanofibers are template method, self-assembly method, stretching method and electrospinning method. However, electrospinning technology is the most important method that can directly and continuously obtain nanofibers. Different from traditional spinning technology, electrospinning technology relies on the traction of electrostatic force to obtain nanofibers. By applying high-voltage static electricity of several thousand volts to tens of thousands of volts in the polymer solution or melt, the polymer droplets overcome the surface tension to generate a jet flow, and the jet flow will split and b...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00
Inventor 李从举王娇娜刘燕君
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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