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Multilayer electret nano-fiber filtering material and preparation method thereof

A nanofiber and filter material technology, applied in the fields of filtration and separation, separation methods, membrane filters, etc., can solve the problems of inability to meet actual use requirements, attenuation of electret performance, reduction of production efficiency, etc., to improve charge storage capacity and charge. Stability, enhanced electrostatic effect, improved liquid output

Active Publication Date: 2017-12-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patents all use heating or high temperature treatment to realize electret on high polymer materials under high voltage. Although there is a certain electret effect and can improve the stability of electret use to a certain extent, it is vulnerable to damage during use. The impact of environmental conditions causes the charge to dissipate, which leads to the attenuation of the electret performance, which cannot meet the actual use requirements, and the subsequent electret process reduces production efficiency

Method used

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  • Multilayer electret nano-fiber filtering material and preparation method thereof

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Effect test

Embodiment 1

[0026] A multilayer electret nanofiber filter material and a preparation method thereof, the preparation method comprising the following steps:

[0027] 1) Preparation of spinning solution: uniformly disperse hydroxyapatite (addition amount 0.5wt%, particle size 0.05μm) in formic acid to form a dispersion solution, and use ultrasonic disperser (ultrasonic frequency 40kHz, ultrasonic temperature 80 ℃) to ultrasonically stir After 20 minutes, nylon 6 (with a weight average molecular weight of 50,000) was added to the dispersion, and after sealing, it was continuously stirred for 15 hours with a magnetic stirring device, and finally a stable and uniform polymer spinning solution with a concentration of 10 wt% was prepared;

[0028] 2) Electrospinning: the prepared polymer spinning solution is sucked into the spinning module through the liquid supply device, and the combined needle for electrospinning is used to realize the spinning polymer solution to be stretched at the tip of th...

Embodiment 2

[0033] A multilayer electret nanofiber filter material and a preparation method thereof, the preparation method comprising the following steps:

[0034] 1) Spinning solution preparation: hydroxyapatite (addition amount 0.5wt%, particle size 0.1 μm) is uniformly dispersed in N,N-dimethylacetamide to form a dispersion liquid, and an ultrasonic disperser (ultrasonic frequency 40kHz , ultrasonic temperature 70° C.) after ultrasonic stirring for 30 min, polyurethane (weight average molecular weight: 80,000) was added to the dispersion, and after sealing, it was continuously stirred for 8 hours with a magnetic stirring device, and finally a stable and uniform concentration of 15 wt % was prepared. polymer spinning solution;

[0035]2) Electrospinning: the prepared polymer spinning solution is sucked into the spinning module through the liquid supply device, and the combined needle for electrospinning is used to realize the spinning polymer solution to be stretched at the tip of the ...

Embodiment 3

[0040] A multilayer electret nanofiber filter material and a preparation method thereof, the preparation method comprising the following steps:

[0041] 1) Preparation of spinning solution: uniformly disperse polytetrafluoroethylene (0.05wt% added, particle size 0.2μm) in N,N-dimethylformamide to form a dispersion, and use an ultrasonic disperser (ultrasonic frequency 35kHz , ultrasonic temperature 50°C) after ultrasonic stirring for 40 minutes, polyvinylidene fluoride (weight average molecular weight: 320,000) was added to the dispersion, and after sealing, it was continuously stirred for 9 hours with a magnetic stirring device, and finally a stable and uniform concentration of 18wt% polymer spinning solution;

[0042] 2) Electrospinning: the prepared polymer spinning solution is sucked into the spinning module through the liquid supply device, and the combined needle for electrospinning is used to realize the spinning polymer solution to be stretched at the tip of the solid ...

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Abstract

The invention relates to a multilayer electret nanofiber filtering material and a preparation method thereof. The invention adopted the technical scheme is as follows: through an electric-field stepped increasing / reducing technology, utilizing a combined needle head for electrostatic spinning to realize deposition of spinning polymer solution on a receiving substrate to obtain nanofiber, carrying out slight dissolving treatment on the surface of a nanofiber layer by a certain release rate by adopting a recovery solvent steam, wherein the nanofiber layer is uniformly filled with electret materials and the diameter of the nanofiber layer is distributed in a stepped-increasing or stepped-reducing manner along the direction vertical to the breadth. According to the multilayer electret nano-fiber filtering material, the electret charge stability is extremely high, the surface electrostatic potential is 250-7000V, simultaneously the filtering performance is excellent, the filtering efficiency for 0.03-10 microns particulates is more than 99.997%, the resistance pressure drop is less than or equal to 39Pa, the service life is long, and the development and application prospect in the aspect of filtering materials for air purifiers, window gauzes, masks and filtering papers and the like are wide.

Description

technical field [0001] The invention relates to a nanometer material and a preparation method, in particular to a multilayer electret nanofiber filter material and a preparation method thereof, belonging to the field of environmental protection materials. Background technique [0002] In recent years, with the advancement of science and technology and the continuous development of industry, heavy industries based on resource and energy consumption have developed rapidly. The exhaust gas emitted by these industrial fields has a high temperature and contains a large amount of particulate matter, causing serious air pollution. It poses a certain threat to human health. Air filter materials are widely used, such as masks, air filters, gas masks, etc. They gradually occupy an important position in maintaining human green life and health. Electrostatic electret nanofiber materials The electrostatic force of the charge can be used to capture dust particles, which has the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16D01D5/00D06M15/05D06M101/34D06M101/38D06M101/22D06M101/32D06M101/18D06M101/24D06M101/26D06M101/30D06M101/28
CPCB01D39/1623B01D2239/0216B01D2239/025B01D2239/1291D01D5/003D01D5/0069D01D5/0084D06M11/05D06M2101/18D06M2101/22D06M2101/24D06M2101/26D06M2101/28D06M2101/30D06M2101/32D06M2101/34D06M2101/38
Inventor 丁彬廖亚龙李玉瑶赵兴雷印霞俞建勇
Owner DONGHUA UNIV
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