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Needle-free electrostatic spinning assembly based on fractal structures

A fractal structure, electrospinning technology, applied in textiles and papermaking, filament/thread forming, fiber processing, etc.

Inactive Publication Date: 2018-01-23
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, the technical problem to be solved by the present invention is to provide a needle-free electrospinning assembly based on a fractal structure, which can greatly enhance the spinning position by using an electrospinning head with a special structure. field strength, reduce edge effects, improve energy utilization, increase nanofiber yield and product uniformity, and avoid the problems of needle clogging and inconvenient cleaning in the traditional needle-type electrospinning process; the obtained nanofibers are finer, and Low fineness variation enables high-speed, large-scale production of finer and more uniform nanofibers

Method used

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  • Needle-free electrostatic spinning assembly based on fractal structures
  • Needle-free electrostatic spinning assembly based on fractal structures
  • Needle-free electrostatic spinning assembly based on fractal structures

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Needle-free multi-jet electrospinning is carried out using a spinning head composed of five broken-line von Koch fractal structures, and each fractal structure spinning unit is connected to the central axis by five spokes passing through the center (see Figure 2~3 ), the broken line of the fractal structural unit is made of brass wire with a diameter of 3mm. The prepared spinning solution is injected into the cylindrical liquid storage tank in the spinning box body through the liquid supply pump (conventional technology), the motor speed is set to 10rev / min, 20kV DC high voltage is introduced into the spinning solution, and the adjustment The receiving distance is 18cm. Start the motor, and when the electrospinning process is stable, set the receiving time to 10 minutes. The obtained nanofibers have an average diameter of 279.58 nm and a CV value of 8.86%. Figure 10 It is the SEM image of nanofibers with a mass fraction of 13% PVDF-HFP.

Embodiment 2

[0039] Needle-free multi-jet electrospinning is carried out using a spinning head composed of five torus-shaped von Koch fractal structures, and each fractal structure spinning unit is connected to the central axis by four spokes passing through the center (see Figure 4~5 ), the torus structure of the fractal structural unit is made of aluminum sheet with a thickness of 5 mm. The prepared spinning solution is injected into the cylindrical liquid storage tank in the spinning box through the liquid supply pump (conventional technology), the motor speed is set to 20rev / min, 22kV DC high voltage is introduced into the spinning solution, and the adjustment The receiving distance is 20cm. Start the motor, and when the electrospinning process is stable, set the receiving time to 10 minutes. The obtained nanofibers have an average diameter of 276.93 nm and a CV value of 13.40%. Figure 11 It is the SEM image of nanofibers with a mass fraction of 13% PVDF-HFP.

Embodiment 3

[0041] A spinning head composed of five planar von Koch fractal structures is used for needle-free multi-jet electrospinning, and each fractal structure spinning unit is connected in series by a central shaft passing through the center (see Figure 6~7 ), the torus structure of the fractal structural unit is made of a stainless steel sheet with a thickness of 4 mm. The prepared spinning solution is injected into the cylindrical liquid storage tank in the spinning box body through the liquid supply pump (conventional technology), the motor speed is set to 30rev / min, 22kV DC high voltage is introduced into the spinning solution, and the adjustment The receiving distance is 19cm. Start the motor, and when the electrospinning process is stable, set the receiving time to 10 minutes. The obtained nanofibers have an average diameter of 308.92 nm and a CV value of 10.04%. Figure 12 It is the SEM image of nanofibers with a mass fraction of 13% PVDF-HFP.

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Abstract

The invention discloses a needle-free electrostatic spinning assembly based on fractal structures and provides an electrostatic spinning technology which can effectively improve the fineness, uniformity and yield of nanometer fibers. The needle-free electrostatic spinning assembly is characterized in that electrostatic spinning heads are formed by using fractal structure units, and the electrostatic spinning heads of different types are obtained through the fractal structures of different forms; different-scale continuous production of the nanometer fibers can be achieved by adjusting the specification and number of the spinning heads of the fractal structures and the working width and length of the spinning heads. The needle-free electrostatic spinning assembly has the advantages that thespecially designed spinning heads of the fractal structures can improve the field intensity and the distribution uniformity, improve the fineness, uniformity and yield of the nanometer fibers, the phenomena that in an existing needle-free electrostatic spinning device, the field intensity is low, the energy consumption is high and the field intensity is nonuniform are avoided, the spinning voltage can be effectively reduced, the cost can be reduced, the energy utilization rate can be improved, and industrialized application and popularization are facilitated.

Description

technical field [0001] The invention relates to an electrospinning technology, in particular to a needle-free electrospinning component based on a fractal structure. Background technique [0002] As a branch of nanotechnology, electrospinning nanofiber production technology has developed rapidly in recent years. This technology uses the electrostatic field force formed by the applied voltage to stretch the spinning solution droplets, and as the solvent volatilizes, the polymer solidifies to form nanofibers. Electrospinning methods are generally divided into two categories: needle-type and needle-free. Multi-needle electrospinning is a general term for a type of capillary or slit extrusion electrospinning technology, including multi-needle, multi-nozzle, and multi-spout hole electrospinning technology, which was once considered to be the first method to realize the large-scale preparation of nanofiber materials. It is an effective method, but the transverse Coulomb repulsio...

Claims

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Application Information

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IPC IPC(8): D01D5/00
Inventor 刘延波杨文秀刘健刘凯强张立改曹红
Owner WUHAN TEXTILE UNIV
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