Method for preparing nano fiber endless tow

A technology of nanofibers and filament bundles, which is applied in fiber processing, filament/thread forming, textiles and papermaking, etc. It can solve problems such as loss, fiber scattering, and fiber loss, so as to avoid scattering and loss, improve production efficiency, The effect of efficient preparation

Inactive Publication Date: 2005-10-26
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

[0005] However, since the size of electrospun fibers is at the nanometer or submicron level, there are often cases of fiber loss, and during the electrospinning process, because the polymers carry the same charge and repel each other, the fibers scatter around and it is not easy to make long Nanofiber bundles or filaments
[0006] Some people use a grounded metal receiver in electrospinning to accept nanofibers produced by a nozzle and process them into nanofiber filaments. This method is inefficient
[0007] Some people use a multi-nozzle system during electrospinning. The nanofibers of the same charge produced by the multi-nozzles must first be in contact with a clean grounded metal receptor to dissipate the charge and then gather to form filaments. However, the nanofibers of the same charge produced by the multi-nozzles Mutual repulsion before reaching the metal receiver, the fibers fly apart, resulting in loss

Method used

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  • Method for preparing nano fiber endless tow
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preparation example Construction

[0021] A method for preparing nanofiber filament bundles adopts a spinning box, two rows of electrospinning nozzles with opposite nozzles are placed in parallel at the same height on the top of the spinning box, and several sets of godet rolls are arranged in the middle of the spinning box Yes, the distance between the godet pair and the electrospinning nozzle facing the two rows of nozzles is equal. The specific preparation steps of a nanofiber filament bundle are as follows: (1) the high polymer solution is delivered to the electrospinning nozzle in the nanofiber filament bundle spinning box; (2) the electrospinning nozzle facing two rows of nozzles Apply a DC high voltage of 10KV-100KV with opposite polarity respectively; (3) The polymer solution at the top of the electrospinning nozzle is stretched and whipped under the action of the electric field force to form charged nanofibers, and the electrospinning nozzle with the opposite nozzle sprays The nanofibers produced have ...

Embodiment 1

[0024] Polyacrylonitrile PAN100g is dissolved in 1000mlN, in N-dimethylformamide, and this polymer solution is delivered to two rows of 100 electrospinning nozzles in the nanofiber filament bundle spinning box. The distance between each row of electrospinning nozzles in the spinning box is 5 cm, and the distance between two rows of electrospinning nozzles facing each other is 10 cm. Apply opposite polarity DC high voltage ±20kv to the electrospinning nozzles with two rows of nozzles facing each other, and the inner diameter of the electrospinning nozzles is 0.5mm. The speed at which the godet pulls the filament bundle is 3 cm / s. The nanofibers ejected from the top of the electrospinning nozzle are drawn by the godet roller to form filament bundles and are led out for collection.

Embodiment 2

[0026] Poly-L-lactic acid PLLA (viscosity average molecular weight 100,000) 100g is dissolved in 500ml acetone and 500ml N, in the mixed solvent of N-dimethylformamide, this polymer solution is delivered to nanofiber filament bundle spinning box There are 100 electrospinning nozzles in each of the two rows. The distance between the nozzles in each row of electrospinning nozzles is 30 cm, and the distance between two rows of electrospinning nozzles facing each other is 50 cm. Apply opposite polarity DC high voltage ±10kv to the electrospinning nozzles with two rows of nozzles facing each other, and the inner diameter of the electrospinning nozzles is 0.2mm. The speed at which the godet pulls the filament bundle is 6 cm / s. The nanofibers ejected from the top of the electrospinning nozzle are drawn by the godet roller to form filament bundles and are led out for collection.

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Abstract

The production method of filament of nanofibers is a simply and high efficiency way. It adopts spinning trunk (3). There are two lines of nozzles (1) whose spout are opposite at the height of the top of the trunk. There are several group of pare of thread guide roller (2) in the trunk.. The distance between thread guide roller and nozzles are equal. The material process is: 1) Transport high polymer solution to nozzles in the trunk of filament of nanofibers; 2) Bring high-voltage DC of opposite polarity to bear to the nozzles. 3) High polymer solution at the top of the nozzles is stretched and whipping responded to form nanofibers which contain electric charge. The opposite nozzle spray nanofibers contains contrary electric charge. They are allure and collide in the air and form nanofibers. The nanofibers are stretched and towed by nozzle and filament of nanofibers comes into being. The operation is simple, highly effective and has no losing of nanofibers.

Description

technical field [0001] The invention relates to a method for preparing nanofiber filament bundles, belonging to the technical field of special fiber preparation. Background technique [0002] Since the birth of the world's first chemical fiber - nitrocellulose in 1883, the research and exploration of synthetic fibers has developed rapidly, and accordingly, various spinning methods have emerged as the times require. The most commonly used spinning methods are melt spinning, dry spinning and wet spinning, others such as phase separation spinning, flash spinning, electrospinning, liquid crystal spinning, reaction spinning, etc. The methods are all newly developed special process spinning methods. [0003] Electrospinning has been recognized as a simple and efficient technique for fabricating fiber membranes. The diameter of electrospun fibers is 100-1000 times smaller than that obtained by ordinary spinning methods, and has a huge specific surface area. It can not only be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00
Inventor 李新松姚琛宋唐英
Owner SOUTHEAST UNIV
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