A method for preparing three-dimensional randomly oriented fibers

A fiber and orientation technology, which is applied in the field of preparation of micro-nano materials, can solve the problems of fiber mechanical properties and water stability degradation, and achieve the effects of small fiber diameter, ultra-high specific pore volume, and high water stability

Active Publication Date: 2021-08-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of three-dimensional randomly oriented fibers, which overcomes the large amount of surfactants contained in the fibers in the prior art, which will cause the fiber aggregates to shrink greatly during the removal process, and the mechanical properties of the fibers and the water stability The defect of performance degradation, this method introduces a small amount of high-conductivity material into the spinning solution, thereby improving the electrostatic repulsion between ultrafine fibers, and obtaining a three-dimensional randomly oriented ultrafine fiber system with ultra-high specific pore volume. The high conductivity material can greatly improve the conductivity of the spinning solution, and realize the rapid transfer and reversal of the charge at the moment of contact with the collection device, so as to realize the electrostatic repulsion with the collection device while maintaining the electrostatic repulsion between the fibers, and finally obtain a randomly oriented structure. The three-dimensional ultrafine fiber aggregate is a three-dimensional electrospinning technology with high efficiency, high material universality, low environmental requirements, rapid prototyping and continuous production. It can achieve ultra-high specific pore volume without using a large amount of additives. Construction of three-dimensional microfiber aggregates with stable shape

Method used

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  • A method for preparing three-dimensional randomly oriented fibers
  • A method for preparing three-dimensional randomly oriented fibers
  • A method for preparing three-dimensional randomly oriented fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Mix chloroform and N,N-dimethylformamide at a volume ratio of 9:1 as a solvent, dissolve polylactic acid (PLA) in the mixed solvent with a concentration of 10wt.%, then stir and dissolve at room temperature at 600rpm for 24h to obtain PLA mother liquor . Glycerol is used as a solvent with a concentration of 0.1wt.%, and then 2wt.% of nano-silver particles are added and shaken until completely dispersed to obtain a mother liquid of nano-silver particles. PLA mother liquor and nano-silver particle mother liquor are mixed by 10:0.8 mass ratio, 200rpm stirs 5min, obtains spinning solution, and the ratio of nano-silver particle and PLA is 1.6wt.% in the spinning solution, and the conductivity of solution can reach 0.5μS / cm.

[0063] The spinning solution is placed in the solution chamber of the single-needle electrospinning device, the spinning environment is controlled at 25 ° C, 50% RH, the fiber receiving device is a flat receiver, 16 cm away from the spinneret, and the...

Embodiment 2

[0065] Add zein to 75% ethanol while stirring, to a concentration of 25wt.%, add citric acid and sodium hypophosphite to the zein solution, and the ratios are 15% and 15% of the zein mass respectively 7.5%, followed by stirring and dissolving at room temperature at 500 rpm for 24 hours to obtain a zein solution. Add glycerol subsequently, concentration is 0.05wt.%, 150rpm stirs 5min, finally adds 1wt.% nano-silver particle, shakes to nano-silver particle and disperses completely in solution and obtains spinning solution, and nano-silver particle in the spinning solution is 4.2 wt.% of zein.

[0066] The spinning solution was placed in the solution chamber of a multi-needle electrospinning device, the spinning environment was controlled at 25°C, 40% RH, the fiber receiving device was a drum-type receiver, and the rotating speed was 800r / min. The distance from the spinneret is 18cm, the solution injection speed is determined to be 1.0mL / h during the spinning process, and the vo...

Embodiment 3

[0068] Using N,N-dimethylformamide as a solvent, polyacrylonitrile (PAN) was dissolved in the solvent at a concentration of 16 wt.%, and then stirred and dissolved at 600 rpm at 70° C. for 24 hours to obtain a PAN solution. Lithium chloride (LiCl) was dissolved in the PAN solution at a ratio of 5 wt.% of the PAN. Then stir at 600 rpm for 10 min until the solution is completely uniform to obtain a spinning solution.

[0069] The spinning solution is placed in the solution chamber of the metal wire electrospinning device, the spinning environment is controlled at 25 ° C, 50% RH, the fiber receiving device is a non-woven PP fiber felt, and the distance from the metal wire nozzle is 12 cm. The spinning speed was 1.5mL / h, and the voltage was kept at 18kV. After the fibers are collected, LiCl is dissolved in distilled water and dried to obtain a specific pore volume of 1800 cm 3 / g, three-dimensional randomly oriented PAN ultrafine fibers with a fiber fineness of 0.5 μm.

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Abstract

The invention relates to a method for preparing three-dimensional randomly oriented fibers. The preparation method includes: preparing a spinning solution; wherein the components of the spinning solution include polymers and high-conductivity materials; performing electrostatic spinning on the above spinning solution, and post-processing to obtain . The invention develops a three-dimensional electrospinning technology based on a high-conductivity spinning system, which has high efficiency, good material universality, low requirements on the spinning environment and continuous production, which can promote the more fine fibers in various fields. for a wide range of application requirements.

Description

technical field [0001] The invention belongs to the field of preparation of micro-nano materials, in particular to a preparation method of three-dimensional randomly oriented fibers. Background technique [0002] Electrospinning technology can produce ultra-fine fibers relatively quickly and continuously, and the equipment is simple and there are many kinds of spinnable materials, so it has attracted much attention. It has been applied in the fields of bioengineering, electrical and electronics, and safety protection. However, the ultrafine fibers prepared by traditional electrospinning are mostly two-dimensional fiber aggregates that are closely stacked in layers. This structure is too dense, which limits its application in many fields. Therefore, it is extremely important to explore a process method of electrospinning to prepare three-dimensional fiber aggregates with large pores and high specific pore volume. [0003] The reported 3D electrospinning related technologies ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/09D01F4/00D01F6/54
CPCD01F1/09D01F4/00D01F6/54D01F6/92
Inventor 蒋秋冉潘宵邓雄张宇杨圆江建财李冉邱夷平
Owner DONGHUA UNIV
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