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Method and device for improving number of electrostatic spinning multiple jet flows

An electrospinning and multi-jet technology, which is applied in the direction of spinning solution preparation, textile and papermaking, filament/thread forming, etc., can solve the problems of low fiber output and low efficiency of nanofiber preparation, and achieve high output and industrial implementation Easy, Simple Effects

Active Publication Date: 2013-05-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the method can combine the single-nozzle multi-jet method with multi-nozzle technology, which can improve defects such as uneven nanofiber film structure caused by multi-nozzle electrostatic mutual interference, significantly increase the output of nanofibers, and solve the problem of nanofiber preparation in the prior art. Problems such as low efficiency and low fiber output

Method used

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  • Method and device for improving number of electrostatic spinning multiple jet flows
  • Method and device for improving number of electrostatic spinning multiple jet flows
  • Method and device for improving number of electrostatic spinning multiple jet flows

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Design a device to improve the multi-jet flow of electrospinning, including liquid storage device 1, syringe pump 5, spinneret 2, metal needle 3, such as figure 1 shown. Wherein the metal needle 3 has a length of 10 cm, a diameter of 0.5 mm, and a hollow structure. The syringe pump 5, the liquid storage device 1, and the spinneret 2 are connected, the metal needle 3 is placed in a position in line with the spinneret 2, and the distance between the tip of the spinneret and the tip of the metal needle is 3 cm.

[0052] Before spinning, take by weighing 14 grams of polyvinyl alcohol polymer powder earlier, and mix with mixed solvent (distilled water and dehydrated alcohol mix with the mass ratio of 1: 1) with the mass ratio concentration of 14%, water bath heating (80 ℃ ) after 3-4 hours, let it stand for two hours to obtain polyvinyl alcohol spinning solution; then put the configured polyvinyl alcohol solution into the liquid storage device 1, connect the liquid storage ...

Embodiment 2

[0054] This embodiment adopts the same device as that of Embodiment 1, such as figure 2 shown.

[0055] Before spinning, weigh 34 grams of high molecular polymer—polyvinylpyrrolidone (model: k-30) powder, and mix it with a mixed solvent (distilled water and absolute ethanol are mixed in a mass ratio of 1:9) with 34% The mass ratio concentration is mixed, after stirring evenly, let stand for 2 hours to obtain polyvinylpyrrolidone spinning solution; then the configured polyvinylpyrrolidone solution is put into the liquid storage device 1, and the liquid storage device 1 and the syringe pump 5 The liquid storage device 1 is connected with the spinneret 2 through a catheter. Ensure that the syringe pump 5, the liquid storage device 1, and the spinneret 2 are well sealed. The positive pole of the electrostatic generator 4 is connected to the spinneret 2, and the negative pole is grounded; both the cylinder 7 and the metal needle 3 are grounded. The distance l between the metal ...

Embodiment 3

[0057] This embodiment adopts basically the same device and process as Implementation 1, and the change is that a spinneret 2 and a liquid storage device 1 are added, such as image 3 shown.

[0058] Before spinning, weigh 20 grams of high-molecular polymer-polyacrylonitrile powder, and mix it with the solvent dimethylformamide at a mass ratio concentration of 12%, heat it in a water bath (50° C.) for 3-4 hours, and let it stand After two hours, the polyacrylonitrile spinning solution was prepared; then the configured polyacrylonitrile solution was loaded into the liquid storage device 1, and each liquid storage device 1 was connected to the syringe pump 5, and the liquid storage device 1 was connected to the spinneret 2 Connected, the vertical distance between the two spinnerets 2 is 4cm. Ensure that the connection between the syringe pump 5, the liquid storage device 1 and the spinneret 2 is well sealed. The positive pole of the electrostatic generator 4 is connected to th...

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Abstract

The invention discloses a method and a device capable of improving the number of electrostatic spinning jet flows. The production method includes the following process steps: (1) preparation of polymer solution or molten liquid; (2) formation of multiple jet flows at the top end of a spinning jet: an appropriate flow rate of the polymer solution or the molten liquid is extruded from a liquid storage device, and forms liquid drops or molten drops at the position of the spinning jet connected with the positive pole of a high-voltage static generator; a metal needle is arranged at the position opposite to the spinning jet and on the same side with a receiving device; and appropriate voltage is supplied, under the action of electrostatic field force, the solution or the molten liquid forms a conical protrusion at the position of the spinning jet, namely a Taylor cone, and when electric field intensity reaches a certain value, multiple jet flows are jetted from the Taylor cone; and (3) forming and receiving of nanofibers. The production device is designed according to the production method, and mainly comprises a liquid supply system, a spinning system, a receiving system and a transmission and control system. According to the method and the device capable of improving the number of the electrostatic spinning jet flows, a single jet flow in a traditional electrostatic spinning process is changed into the multiple jet flows under the premise that other conditions such as voltage increase or conducting material addition are not needed, meanwhile, the shortcomings that nanofiber membranes are uneven in structure due to mutual interference of multi-jet static, and the like are overcome, production efficiency is high, and needs of large-scale production of the nanofibers can be met.

Description

technical field [0001] The invention belongs to the technical field of textiles and new materials, and relates to a method and device for improving the multi-jet flow in the electrospinning process, specifically introducing metal needles in the spinning area to promote the formation of multiple jets on the surface of the Taylor cone to improve the preparation efficiency of micro-nano fibers method and device. Background technique [0002] Electrospinning technology is a technology that uses a high-voltage electrostatic field to deform and flow a polymer solution or melt to obtain nanofibers. The main principle of electrospinning technology is to make the polymer solution or melt carry thousands to tens of thousands of volts of high-voltage static electricity. The solution or melt forms a conical bulge at the spinneret under the action of the electric field force. When the electric field force is large enough , The polymer solution or melt can overcome the surface tension to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01D1/02
Inventor 刘雍孙雪峰范杰康卫民程博闻王瑞
Owner TIANJIN POLYTECHNIC UNIV
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