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Nanometre-sized fibre liquid separation composite film and preparation method thereof

A nanofiber, liquid separation technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of large-scale coating of electrospinning nanofiber non-woven fabrics, difficult to promote and apply, etc. , to achieve the effect of easy spinning parameter control, simple and easy control of the processing process

Inactive Publication Date: 2009-10-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these methods for reducing the pore size mostly use the surface coating method, and it is difficult to uniformly and efficiently coat large-area electrospun nanofiber nonwovens on a large scale while controlling the thickness of the selected layer.
In other words, this method strategy is difficult to be promoted and applied in industrial production

Method used

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  • Nanometre-sized fibre liquid separation composite film and preparation method thereof
  • Nanometre-sized fibre liquid separation composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 13.0 g of polyacrylonitrile (PAN) was dissolved in 87 g of N,N-dimethylacetamide (DMAC) solvent to obtain the first transparent and uniform electrospinning solution;

[0034] (2) Dissolve 4.0 g of polyvinylidene fluoride (PVDF) in 92 g of a mixed solvent of N,N-dimethylformamide (DMF) / acetone, N-dimethylformamide (DMF) / acetone=2 / 8, to obtain a transparent and uniform second electrospinning solution;

[0035](3) Add the first spinning stock solution into the container, extrude under the control of a micro-injection pump, the nozzle is connected to a high-voltage positive electrode, the electrospinning parameters are controlled at a voltage of 16kv, the nozzle aperture is 0.5mm, the solution flow rate is 30μl / min, and the ambient temperature Electrospinning was performed at 25° C. and a relative air humidity of 75%. The obtained PAN electrospun nanofibers had an average diameter of 1.2 μm and a deposition thickness of 500 μm. The porosity is 72%.

[0036] (4) Add t...

Embodiment 2

[0044] (1) 19.0 g of polysulfone (PSU) was dissolved in 81 g of N,N-dimethylformamide (DMF) solvent to obtain the first transparent and uniform electrospinning solution;

[0045] (2) 7.0 g of polyvinyl alcohol (PVA) was dissolved in 93 g of deionized water to obtain a transparent and uniform second electrospinning solution;

[0046] (3) Add the first spinning stock solution into the container, extrude under the control of a micro-injection pump, connect the nozzle to a high-voltage positive electrode, and control the electrospinning parameters at a voltage of 10kv, a nozzle aperture of 1mm, a solution flow rate of 40μl / min, and an ambient temperature of 55 ℃, air relative humidity 45%, carry out electrospinning, the average diameter of the obtained PAN electrospun nanofiber is 2 μm, deposition thickness is 250 μm, porosity is 86%;

[0047] (4) Add the second spinning stock solution into the container, extrude under the control of a micro-injection pump, connect the nozzle to a...

Embodiment 3

[0051] (1) 24g of polyethersulfone (PES) was dissolved in 76g of N,N-dimethylformacetamide (DMAC) solvent to obtain the first transparent and uniform electrospinning solution;

[0052] (2) Dissolving 12.0 g of polyamic acid in 88 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform second electrospinning solution;

[0053] (3) Add the first spinning stock solution into the container, extrude under the control of a micro-injection pump, the nozzle is connected to a high-voltage positive electrode, the electrospinning parameters are controlled at a voltage of 18kv, the nozzle aperture is 1.8mm, the solution flow rate is 35μl / min, and the ambient temperature Electrospinning was performed at 25° C. and relative air humidity of 45%. The obtained PAN electrospun nanofibers had an average diameter of 500 nm and a deposition thickness of 70 μm. Porosity 92%

[0054] (4) Add the second spinning stock solution into the container, extrude under the control of a m...

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Abstract

The invention discloses a nanometre-sized fibre liquid separation composite film and a preparation method thereof. The preparation method comprises the steps of (1) performing electrostatic spinning for a macromolecular spinning solution A to obtain a non-woven fabric as a supporting layer of the composite film; (2) coating a macromolecular spinning solution B on the surface of the non-woven fabric obtained in the step (1) in a spray coating manner as a selection layer of the composite film; and (3) suffocating the surface of a second nanometre-sized fibre layer by solvent steam; and (4) thermally treating or chemically treating the product obtained in the step (3) to obtain the finished product. The method of the invention has a manufacturing process that is simple and easily controlled,is capable of conveniently and precisely controlling the thickness and uniformity of the surface selection layer, and easily realizes operations of mass production. The obtained nanometre-sized fibreliquid separation composite film can be widely applied to the fields such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis, etc.

Description

technical field [0001] The invention belongs to the field of polymer separation membranes, in particular to a preparation method for obtaining liquid separation membranes by using electrospun nanofibers as raw materials. Background technique [0002] In today's world, the shortage of water resources and environmental pollution are becoming more and more serious. According to the monitoring of the environmental department, at least 100 million tons of sewage in cities and towns across the country are directly discharged into water bodies without treatment every day. The water quality of more than half of the country's seven major water systems is polluted, 1 / 3 of the country's water bodies are not suitable for fish, 1 / 4 of the water bodies are not suitable for irrigation, 90% of urban waters are seriously polluted, and 50% of urban water sources are not suitable for drinking Water standards, 40% of the water is not drinkable. [0003] Membrane water treatment technology has ...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D69/12
Inventor 王雪芬朱美芳张锴杨寅魏洁林
Owner DONGHUA UNIV
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