Micron fiber/nano fiber composited electret filter material and preparation method thereof

A microfiber and nanofiber technology, applied in filtration and separation, membrane filters, fiber treatment, etc., can solve the problems of reducing the dielectric properties of materials and the impact of long-term charge storage capacity, achieving enhanced charge stability, simple preparation methods, The effect of enhanced charge storage capacity

Active Publication Date: 2017-12-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The electret filter materials involved in the above patents all use corona discharge or electric breakdown polarization to achieve charge injection, and the electret charge storage capacity and charge stability are

Method used

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  • Micron fiber/nano fiber composited electret filter material and preparation method thereof
  • Micron fiber/nano fiber composited electret filter material and preparation method thereof

Examples

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[0032] Example 1

[0033] A microfiber / nanofiber composite electret filter material and a preparation method thereof, the preparation method mainly comprises the following steps: 1) uniformly dispersing hydroxyapatite (addition amount 0.5wt%, particle size 0.05μm) in N, N- In dimethylformamide, a dispersion liquid was formed. After ultrasonic stirring for 0.5 h, polyvinylidene fluoride (weight-average molecular weight of 320,000) was added to the dispersion liquid. Finally, a stable and uniform polymer spinning solution A with a mass concentration of 20 wt% is prepared for preparing the nanofiber layer;

[0034] Similarly, hydroxyapatite (addition amount of 1 wt%, particle size of 0.05 μm) was uniformly dispersed in N,N-dimethylformamide to form a dispersion, and after ultrasonic stirring for 0.5 h, polystyrene (weight average The molecular weight is 80,000) is added to the dispersion, and after sealing, it is continuously stirred with a magnetic stirring device for 8 hours, ...

Example Embodiment

[0039] Example 2

[0040] A microfiber / nanofiber composite electret filter material and a preparation method thereof, the preparation method mainly comprises the following steps: 1) hydroxyapatite (addition amount 0.5wt%, particle size 0.1μm) is uniformly dispersed in N, N- In dimethylacetamide, a dispersion liquid was formed. After ultrasonic stirring for 0.5 h, polyvinylidene fluoride (weight-average molecular weight of 570,000) was added to the dispersion liquid. Finally, a stable and uniform polymer spinning solution A with a mass concentration of 18wt% was prepared for preparing the nanofiber layer;

[0041] Similarly, hydroxyapatite (addition amount of 1 wt%, particle size of 0.05 μm) was uniformly dispersed in N,N-dimethylformamide to form a dispersion, and after ultrasonic stirring for 0.5 h, polystyrene (weight average The molecular weight is 80,000) is added to the dispersion, and after sealing, it is continuously stirred with a magnetic stirring device for 8 hours,...

Example Embodiment

[0046] Example 3

[0047] A microfiber / nanofiber composite electret filter material and a preparation method thereof, the preparation method mainly includes the following steps: 1) uniformly dispersing polytetrafluoroethylene (addition amount 0.05wt%, particle size 0.2μm) in N, N- In dimethylacetamide, a dispersion liquid was formed. After ultrasonic stirring for 1 h, polyvinylidene fluoride (weight average molecular weight was 570,000) was added to the dispersion liquid. A stable and uniform polymer spinning solution A with a mass concentration of 18 wt% was prepared for preparing a nanofiber layer;

[0048] Similarly, polytetrafluoroethylene (addition amount of 0.1 wt%, particle size of 0.2 μm) was uniformly dispersed in N,N-dimethylacetamide to form a dispersion. After ultrasonic stirring for 0.5 h, polysulfone (weight average The molecular weight is 70,000) is added to the dispersion, and after sealing, the magnetic stirring device is used for continuous stirring for 15 h...

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Abstract

The invention relates to a micron fiber/nano fiber composited electret filter material and a preparation method thereof. The preparation method is as follows: a micron fiber and nano fiber three dimensional structure composited electret filter material is obtained by forming on a receiving base material in one step by using an annular gradient solvent vapor rapid removing device and a double-area isolation spinning control technique in the electrostatic spinning process. An electret material is evenly distributed in a micron fiber and nano fiber layer of the composited electret filter material, the charge storage capability and the charge stability of the electret material are strengthened under the action of a high voltage electric field, and the electrostatic effect of the composited electret filter material is utilized to effectively improve the filtering efficiency of the filter material. The charge stability of an electret of the micron fiber/nano fiber composited electret filter material is very high, the surface electrostatic potential is 300-8000 V, the filtering efficiency of particles of 0.02-20 [mu]m is greater than or equal to 99.97%, the resistance is less than or equal to 30 Pa, the service life is long, and the prospect of development and application is broad.

Description

technical field [0001] The invention relates to a microfiber / nanofiber composite electret filter material and a preparation method thereof, in particular, through an annular gradient solvent vapor rapid removal device, a dual-area isolation spinning control technology is adopted to form one-step molding on a receiving substrate to obtain micron The invention discloses a three-layer structure electret composite filter material of fibers and nanofibers, which belongs to the field of environmental materials. Background technique [0002] Although traditional filter materials can effectively filter pollutant particles, they usually have a high resistance pressure drop if they want to achieve high filtration efficiency. Therefore, it is difficult to achieve an effective balance between filtration efficiency and pressure resistance only by the structural characteristics of the fiber itself. In addition to conventional physical interception and inertial collision, the introduction ...

Claims

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Application Information

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IPC IPC(8): B01D39/14D01D5/00D01D13/00D04H3/005D04H3/033
CPCB01D39/14B01D2239/10D01D5/003D01D5/0076D01D13/00D04H3/005D04H3/033
Inventor 丁彬廖亚龙李玉瑶赵兴雷蒋攀印霞俞建勇
Owner DONGHUA UNIV
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