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Electrospinning nozzle and its spinning method controlled by separation of liquid surface curvature and electric field

A technology of separation control and electrospinning, which is applied in the direction of textiles and papermaking, filament/thread forming, fiber processing, etc. It can solve the problems of volatile solvent of the spinning solution to be spun, unstable free liquid surface of the rapid movement of the nozzle, etc. Achieve the effect of simple technology and reduce solvent volatilization

Active Publication Date: 2020-08-11
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a bowl-shaped electrospinning nozzle with separate control of the curvature of the spinning solution and the spinning electric field and its use method, so as to solve the problem of excessive free liquid surface of the spinning solution to be spun in the current batch electrostatic spinning process. large, the solvent of the spinning solution to be spun is volatile, and the free liquid surface is unstable due to the rapid movement of the nozzle. At the same time, the precise design and control of the electric field and the curvature of the spinning solution during the electrospinning process is realized, and the narrow distribution of submicron fibers and nanofibers is achieved. batch preparation

Method used

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  • Electrospinning nozzle and its spinning method controlled by separation of liquid surface curvature and electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method of electrospinning:

[0032] The spinning solution 1 uses a polymer solution prepared from polyacrylonitrile (PAN) and N-N dimethylformamide (DMF) to prepare nanofibers. The mass fraction of the prepared PAN polymer solution is 10%.

[0033] Adjust the distance between the metal roller 10 and the bowl-shaped metal nozzle 6 to be 20cm; adjust the relative height of the liquid surface curvature stabilization control module 13 and the insulating seat 2 to form an annular slit 14 with a width of 0.5mm; turn on the motor 9 and set the metal roller 10 The rotating speed is 60r / min; open the switch of the liquid supply control device 16, inject a certain amount of spinning solution 1 to the annular slit channel 14 through the peristaltic pump until the surface solution is completely full; set the reciprocating speed of the bowl-shaped metal nozzle 6 as 500mm / s; turn on the high-voltage generator 4, and slowly increase the voltage to 70kV; a large number of jets 8 are...

Embodiment 2

[0035] A method of electrospinning:

[0036] The spinning solution 1 uses a polymer solution prepared from polyacrylonitrile (PAN) and N-N dimethylformamide (DMF) to prepare nanofibers. The mass fraction of the prepared PAN polymer solution is 12%.

[0037] Adjust the distance between the metal drum 10 and the bowl-shaped metal nozzle 6 to be 18 cm; adjust the relative height of the liquid surface curvature stabilization control module 13 and the insulating seat 2 to form an annular slit 14 with a width of 0.6 mm; turn on the motor 9 and set the metal drum 10 The rotation speed is 80r / min; the switch of the liquid supply control device 16 is opened, and a certain amount of spinning solution 1 is injected into the annular slit channel 14 through the peristaltic pump until the surface solution is completely full; the reciprocating speed of the bowl-shaped metal nozzle 6 is set to 700mm / s; turn on the high-voltage generator 4, and slowly increase the voltage to 80kV; a large num...

Embodiment 3

[0039] A method of electrospinning:

[0040] The spinning solution 1 uses a polymer solution prepared from polyacrylonitrile (PAN) and N-N dimethylformamide (DMF) to prepare nanofibers. The mass fraction of the prepared PAN polymer solution is 14%.

[0041] Adjust the distance between the metal roller 10 and the bowl-shaped metal nozzle 6 to be 25cm; adjust the relative height of the liquid surface curvature stabilization control module 13 and the insulating seat 2 to form an annular slit 14 with a width of 0.7mm; turn on the motor 9 and set the metal roller 10 The rotating speed is 90r / min; the switch of the liquid supply control device 16 is opened, and a certain amount of spinning solution 1 is injected into the annular slit passage 14 through the peristaltic pump until the surface solution is completely full; the reciprocating speed of the bowl-shaped metal nozzle 6 is set to 500mm / s; turn on the high-voltage generator 4, and slowly increase the voltage to 70kV; a large n...

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Abstract

The invention discloses an electrostatic spinning sprayer based on separation control of liquid level curvatures and electric fields and an electrostatic spinning method. The electrostatic spinning sprayer comprises a bowl-shaped metal sprayer in positive-electrode connection with a high-pressure generator. A liquid level curvature stabilizing and adjusting module is arranged in the bowl-shaped metal sprayer. An annular narrow channel is formed between the inner wall of the bowl-shaped metal sprayer and the outer wall of the liquid level curvature stabilizing and adjusting module, and is communicated with spinning liquid in a spinning liquid storage tank through a liquid guide pipe. The spinning method includes starting up a receiver and a liquid supply controller, and injecting the spinning liquid into the annular narrow channel; allowing the bowl-shaped metal sprayer to reciprocate under the receiver; starting up the high-pressure generator, generating jet flows above the annular narrow channel, and allowing the jet flows to form nanofibers on the receiver. The electrostatic spinning sprayer has the advantages that the free liquid level of the spinning liquid can be stabilized without interference on electric field regulation, solvent evaporation can be reduced, the electrostatic spinning sprayer can adapt to rapid movement, and batch preparation of narrow-range submicron fibers and nanofibers can be realized.

Description

technical field [0001] The invention relates to an electrospinning nozzle and a spinning method thereof controlled by liquid surface curvature and electric field separation, and belongs to the technical field of nanofiber and textile machinery. Background technique [0002] When polymer fiber diameters are reduced from the micrometer scale to the submicrometer or nanometer scale, a surprising set of properties emerges. Such as a very large volume specific surface area, the volume specific surface area of ​​nanofibers is basically 1000 times that of microfibers; it can be flexibly functionalized on the surface; it shows superior effects and mechanical properties compared with other known material forms, such as surface And interface effect, small size effect, quantum size effect and quantum tunneling effect and stiffness, tensile strength, etc. These outstanding properties make nanofibers the material of choice for many important applications, and have great development pote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/00
CPCD01D5/0061D01D5/0069
Inventor 覃小红熊健王荣武魏亮
Owner DONGHUA UNIV