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Combination of electrostatic spinning and electrostatic spraying for preparing nanofibre base composite separation membrane

An electrostatic spraying and nanofiber technology, applied in electrostatic spraying devices, chemical instruments and methods, fiber processing, etc., can solve the problems of difficulty in controlling the thickness of the selected layer, difficulty in promotion and application, etc., and achieves a simple and easy preparation method. Precisely controlled effects

Inactive Publication Date: 2012-06-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 24 g of polyethersulfone (PES) was dissolved in 76 g of N,N-dimethylformacetamide (DMAC) solvent to obtain a transparent and uniform electrospinning solution;

[0025] (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. Obtain a transparent and uniform electrostatic spray solution;

[0026](3) Add the electrospinning stock solution in (1) into the container, and 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, and the solution flow rate is 30μl / min. The ambient temperature is 25°C, the relative air humidity is 75%, and electrospinning is performed. The average diameter of the obtained PES electrospun nanofibers is 1.2 μm, the deposition thickness is 500 μm, and the porosity is 72%;

[0027] (4) Add...

Embodiment 2

[0033] (1) 19.0 g of polysulfone (PSU) was dissolved in 81 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform electrospinning solution;

[0034] (2) 7.0 g of polyvinyl alcohol (PVA) was dissolved in 93 g of deionized water to obtain a transparent and uniform electrostatic spray solution;

[0035] (3) Add the electrospinning stock solution in (1) into the container, and extrude it under the control of a micro-injection pump. Electrospinning was carried out at 55°C, and the obtained PSU electrospun nanofibers had an average diameter of 2 μm, a deposition thickness of 250 μm, and a porosity of 86%;

[0036] (4) Add the electrostatic spray stock solution in (2) into the container, and 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 45kv, the nozzle aperture is 0.05mm, the solution flow rate is 8μl / mln, and the ambient temperatur...

Embodiment 3

[0040] (1) 13.0 g of polyacrylonitrile (PAN) was dissolved in 87 g of N,N-dimethylacetamide (DMAC) solvent to obtain a transparent and uniform electrospinning solution;

[0041] (2) Dissolving 12.0 g of polyamic acid in 88 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform electrostatic spray solution;

[0042] (3) Add the spinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump. 25°C, electrospinning, the average diameter of the obtained PAN electrospun nanofibers is 500nm, the deposition thickness is 70μm, and the porosity is 92%;

[0043] (4) Add the electrostatic spray stock solution in (2) into the container, and extrude under the control of a micro-injection pump. The nozzle is connected to a high-voltage positive electrode. The electrostatic spray parameters are controlled at a voltage of 12kv, the nozzle aperture is 0.8mm, the solution flow rate is 5μl / min, and the ambient temperature 15°C, 25...

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Abstract

The invention relates to a combination of electrostatic spinning and electrostatic spraying for preparing a nanofibre base separation composite membrane, comprising: dissolving functional polymer film material in solvent; preparing into polymer spinning solution A for electrostatic spinning, and obtaining non-woven fabrics to serve as the support layer of a composite membrane; dissolving another functional polymer film material in the solvent; preparing into polymer spinning solution B, and spraying the polymer spinning solution B on the surface of the non-woven fabrics by electrostatic spraying to serve as the selecting layer of the composite membrane; carrying out heat treatment or chemical treatment on the above product; and preparing the nanofibre base composite separation membrane. The preparation method provided by the invention is simple and easy to realize, can conveniently and accurately control the thickness and the evenness of the surface selecting layer, and is easy to realize the operation of large-scale production; the prepared nanofibre base composite separation membrane can be widely applied in the fields of microfiltration, ultra filtration, reverse osmosis and the like.

Description

technical field [0001] The invention belongs to the field of preparation of separation composite membranes, in particular to an electrospinning combined with electrostatic spraying method to prepare nanofiber-based separation composite membranes. Background technique [0002] In today's world, water shortages and environmental pollution are becoming more and more serious, and my country is a country with serious water shortages. The total amount of fresh water resources is 2,800 billion cubic meters, accounting for 6% of global water resources, and the per capita is only 2,300 cubic meters, which is only 1 / 4 of the world's average level. There are 300 cities in the country that lack water, and the national urban industry loses 120 billion yuan a year due to water shortage. It is one of the 13 countries with the poorest per capita water resources in the world. According to monitoring by the environmental department, at least 100 million tons of untreated sewage is discharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00D01D5/00B05B5/00
Inventor 王雪芬由昊杨寅阎怡瑾朱美芳
Owner DONGHUA UNIV