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In-situ water electret method based on electrostatic spinning and fiber material with charge bubbles

A technology of electrospinning and fiber materials, which is applied in the field of fiber materials, and can solve problems such as cell structure enhancement of electret performance

Active Publication Date: 2021-12-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the disclosed air filter fibers, there is no material that enhances the electret performance with a cell structure

Method used

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  • In-situ water electret method based on electrostatic spinning and fiber material with charge bubbles

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Effect test

Embodiment 1

[0020] In this embodiment, an in-situ water electret method based on electrospinning is provided. A ring-shaped water spray device is arranged around the jet flow to increase high pressure to atomize water molecules. The macroscopic motion direction of the atomized water molecules and high-speed flight The angle between the moving directions of the charged jet is 10°; the particle size of the atomized water molecule is 80 μm; the water is ultrapure water; the main component of the fiber is polyvinylidene fluoride, the form is powder, the molecular weight is 50000, the solvent It is N-N dimethylformamide, and the mass concentration of the colloidal solution formed is 20wt%; the process conditions of electrospinning are: voltage 18KV, receiving distance 20cm, injection speed 1mL / h, temperature 20℃, relative humidity 87%, spinning Silk time 1h.

Embodiment 2

[0022] In this embodiment, an in-situ water electret method based on electrospinning is provided. A ring-shaped water spray device is arranged around the jet flow to increase high pressure to atomize water molecules. The macroscopic motion direction of the atomized water molecules and high-speed flight The angle between the moving directions of the charged jet is 30°; the atomized water molecular size is 100 μm; the water is deionized water; the main component of the fiber is polycarbonate, the form is powder, the molecular weight is 100,000, and the solvent is Acetone, the mass concentration of the formed colloidal solution is 23wt%; the process conditions of electrospinning are: voltage 25KV, receiving distance 20cm, injection speed 3mL / h, temperature 30℃, relative humidity 90%, spinning time 1h.

Embodiment 3

[0024] In this embodiment, an in-situ water electret method based on electrospinning, when the aqueous spinning solution flows out from a needle with high-voltage static electricity, the water molecules are broken into fine droplets or jets under the action of high-voltage electricity, The fibers were electreted by friction with the nanofibers, and the water content in the spinning solution was 10%. The particle size of the atomized water molecule is 80 μm; the water is deionized water; the main component of the fiber is polyvinyl chloride, the form is liquid, the molecular weight is 30000, the solvent is tetrahydrofuran, and the mass concentration of the formed colloid solution is 30wt%; electrostatic The spinning process conditions were: voltage 18KV, receiving distance 20cm, injection speed 2mL / h, temperature 25°C, relative humidity 95%, and spinning time 1h.

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Abstract

The invention belongs to the technical field of fiber materials, and discloses an in-situ water electret method based on electrostatic spinning and a fiber material with charge bubbles. According to the in-situ water electret method, water is atomized through high pressure in the electrostatic spinning process, electric charges are generated between water molecules and charged jet flow flying at a high speed due to the friction effect, and then in-situ electret of the fibers is achieved when jet flow phase separation and curing are conducted to form the fibers. The interior of the obtained fiber material with the charge bubbles is provided with a closed bubble hole structure, charges with opposite polarities are accumulated on opposite faces of bubble holes, polar charge bubbles are formed, the charges injected into the polar charge bubbles and a fiber entity can be subjected to vector superposition, a single fiber with a remarkable electrostatic electret effect is formed, the surface potential of a fiber membrane is controllable in the range of 0.05 to 1kV, and the charge bubble structure enables the electret effect to have extremely high stability.

Description

technical field [0001] The invention belongs to the technical field of fiber materials, and discloses an in-situ preparation technology of electret fibers, in particular an in-situ water electret method based on electrospinning and a fiber material with charge bubbles. Specifically, in the process of electrospinning, the high-pressure atomized water molecules and the high-speed flying charged jets generate charges due to friction. On the one hand, the in-situ electret of the fibers is realized; The introduction produces a charge bubble structure synchronously. The in-situ electret and the closed cell structure inside the fiber promote each other, so that the electret effect of the fiber is significant and stable, and the controllable preparation of high-efficiency air filter materials can be realized. Background technique [0002] Air filter materials have become a hot research topic in recent years. Meltblown nonwovens have become one of the most commonly used nonwoven fi...

Claims

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Application Information

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IPC IPC(8): D06M10/02D06M11/05D01D5/00D04H1/728D06M101/22D06M101/32D06M101/28D06M101/30
CPCD06M10/02D06M11/05D04H1/728D01D5/003D06M2101/22D06M2101/32D06M2101/28D06M2101/30
Inventor 李玉瑶华乐珍刘雍范杰
Owner TIANJIN POLYTECHNIC UNIV
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