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Method and device for preparing polyacrylonitrile pre-oxidation nanofiber yarns through electrostatic spinning

A technology of electrospinning and polyacrylonitrile, which is applied in spinning solution preparation, fiber processing, filament/thread forming, etc., achieves broad application prospects, simple preparation method, and uniform effect.

Inactive Publication Date: 2013-09-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The results of searching domestic and foreign literature and patents on polyacrylonitrile-based preoxidized fibers show that there is no report on the preparation of polyacrylonitrile preoxidized nanofiber yarns by electrospinning.

Method used

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  • Method and device for preparing polyacrylonitrile pre-oxidation nanofiber yarns through electrostatic spinning
  • Method and device for preparing polyacrylonitrile pre-oxidation nanofiber yarns through electrostatic spinning
  • Method and device for preparing polyacrylonitrile pre-oxidation nanofiber yarns through electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An electrospinning device, comprising: a first spinneret 1, a second spinneret 2, a metal circular target 3, an insulating rod 4, a first motor 5, a second motor 8, a hollow metal rod 6, and a bobbin 7. The positive pole 9 of the high-voltage electrostatic generator and the negative pole 10 of the high-voltage electrostatic generator, the first spinneret 1 and the second spinneret 2 are respectively connected to the positive pole 9 of the high-voltage electrostatic generator and the negative pole 10 of the high-voltage electrostatic generator; The yarn bobbin 7 is connected with the second motor 8; the metal circular target 3 is connected with the insulating rod 4 with one end connected with the first motor 5; the hollow metal rod 6 is fixed and has a tip, except the tip, The rest are sprayed with insulating varnish.

[0031] The distance between the first spinneret 1 and the second spinneret 2 is 3-30 cm.

[0032] The distance between the metal circular target 3 and t...

Embodiment 2

[0035] (1) To prepare the spinning solution, weigh 12.000g polyacrylonitrile with an electronic analytical balance and dissolve it in 88.000g dimethylformamide, stir it in a water bath at 80°C until it is completely dissolved, and let it stand for defoaming to obtain a concentration of 12%. polyacrylonitrile solution;

[0036] (2) The electrospinning device described in Example 1 is used for electrospinning, and the spinning solution obtained in step (1) is transported to each spinneret through an external automatic infusion device, and the spinnerets are respectively connected to high voltage The positive and negative poles of the electrostatic generating device start electrospinning, and the jets ejected from the spinneret form oriented nanofiber bundles, which are then twisted and wound to obtain polyacrylonitrile nanofiber yarns;

[0037] (3) The polyacrylonitrile nanofiber yarn obtained in step (2) was pre-oxidized and heat-set in the air at 220° C. for 1 hour to obtain a...

Embodiment 3

[0041] (1) Preparation of spinning solution: Weigh 14.000g of polyacrylonitrile with an electronic analytical balance and dissolve it in 86.000g of dimethylformamide, stir it in a water bath at 80°C until it is completely dissolved, and let it stand for defoaming to obtain a concentration of 14%. polyacrylonitrile solution;

[0042] (2) The electrospinning device described in Example 1 is used for electrospinning, and the spinning solution obtained in step (1) is transported to each spinneret through an external automatic infusion device, and the spinnerets are respectively connected to high voltage The positive and negative poles of the electrostatic generating device start electrospinning, and the jets ejected from the spinneret form oriented nanofiber bundles, which are then twisted and wound to obtain polyacrylonitrile nanofiber yarns;

[0043] (3) The polyacrylonitrile nanofiber yarn obtained in step (2) was pre-oxidized and heat-set in the air at 250° C. for 1 hour to ob...

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Abstract

The invention relates to a method and a device for preparing polyacrylonitrile pre-oxidation nanofiber yarns through electrostatic spinning. Two spinning jets of the device are respectively connected with a positive electrode and a negative electrode of a high-voltage electrostatic generator; a metal round target is connected with an insulation rod of which one end is connected with a motor; a hollow metal rod is fixed and is provided with a tip; and except for the tip, the rest part of the hollow metal rod is sprayed with insulation paint. The method comprises the following steps: (1) preparing polyacrylonitrile spinning solution; (2) performing electrostatic spinning by adopting an electrostatic spinning device, forming oriented nanofiber bundles by jet flow sprayed from the two spinning jets, and molding through twisting and winding to obtain polyacrylonitrile nanofiber yarns; and (3) carrying out pre-oxidation heat setting on the polyacrylonitrile nanofiber yarns to obtain the polyacrylonitrile pre-oxidation nanofiber yarns. The method is simple to operate. The polyacrylonitrile nanofiber yarns obtained by adopting the device to carry out eletrostatic spinning have the advantage of evenness, and the device is expected to be widely applied in the carbon fiber manufacturing field.

Description

technical field [0001] The invention belongs to the field of electrospinning and devices thereof, in particular to a method and a device for preparing polyacrylonitrile preoxidized nanofiber yarns by electrospinning. Background technique [0002] It has only been nearly a hundred years since the birth of the first batch of carbon fibers, but because carbon fibers have outstanding high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and thermal expansion coefficient A series of excellent properties such as small size have received extensive attention from both military and civilian industries. The diameter of carbon fibers currently used is mainly at the micron level, so many properties of carbon fibers cannot be fully displayed. For example, the theoretical value of carbon fiber strength is 180GPa, but the strongest carbon fiber can only reach about 7GPa....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01D1/02D01D11/00
Inventor 覃小红吴韶华李鹏翔张彩丹刘澎红
Owner DONGHUA UNIV
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