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High and low dielectric polymer composite electret filter material and preparation method thereof

A technology of dielectric polymers and filter materials, applied in filtration separation, membrane filters, separation methods, etc., can solve the problems of insufficient mechanical strength of fiber membranes, poor charge storage stability, and high cost of filter materials, and achieve long-term stable filtration efficiency , large insulation resistance, simple production method

Inactive Publication Date: 2019-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the above technology is that although this method can enhance the initial surface potential of the electret filter material, the long-term charge storage stability is still poor, and the process is relatively complicated
[0008] The disadvantages of the above technology are: although the electret charge stability can be effectively maintained, the mechanical strength of the fiber membrane is insufficient, and the device is relatively complicated, and the cost of the filter material is relatively high

Method used

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  • High and low dielectric polymer composite electret filter material and preparation method thereof
  • High and low dielectric polymer composite electret filter material and preparation method thereof
  • High and low dielectric polymer composite electret filter material and preparation method thereof

Examples

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Embodiment 1

[0037] A high and low dielectric polymer composite electret filter material and its preparation method in this embodiment, the specific steps are:

[0038] (1) Accurately weigh 13.2g of N-N dimethylformamide and 13.2g of tetrahydrofuran in a 50mL beaker with an electronic balance, then weigh 0.02g of nano-polytetrafluoroethylene (purity 99.5%, average particle size 20nm) and place in the above In the mixed solvent, vibrate with an ultrasonic oscillator for 1.5h, then accurately weigh 3.6g of polystyrene with an electronic balance and place it in the above-mentioned beaker, add a stirring bar, and stir on a magnetic stirrer for 8 hours to form a uniform and stable spinning solution. Silk liquid, number 1. Accurately weigh 13.2g of N-N dimethylformamide and 13.2g of tetrahydrofuran in a 50mL beaker with an electronic balance, then weigh 3.6g of polyvinyl chloride and place it in the above mixed solvent, add a stirring bar, and stir on a magnetic stirrer for 8 Hours, it is confi...

Embodiment 2

[0044] A high and low dielectric polymer composite electret filter material and its preparation method in this embodiment, the specific steps are:

[0045] (1) Accurately weigh 13.2g of N-N dimethylformamide and 13.2g of tetrahydrofuran with an electronic balance and place them in a 50mL beaker, then weigh 0.02g of nano polychlorotrifluoroethylene (purity 99.5%, average particle size 30nm) and place in In the above mixed solvent, vibrate with an ultrasonic oscillator for 1.5h, then accurately weigh 3.6g of polystyrene with an electronic balance and place it in the above beaker, add a stirrer, and stir on a magnetic stirrer for 8 hours to form a uniform and stable solution. Spinning solution, number 1. Accurately weigh 26.4g of N-N dimethylformamide with an electronic balance and place it in a 50mL beaker, then weigh 3.6g of polyacrylonitrile and place it in the above mixed solvent, add a stirring bar, stir on a magnetic stirrer for 6 hours, and configure Become a uniform and ...

Embodiment 3

[0051] The preparation method of a high and low dielectric polymer composite electret filter material in this embodiment, the specific steps are:

[0052] (1) Accurately weigh 12.75g of N-N dimethylformamide and 12.75g of tetrahydrofuran in a 50mL beaker with an electronic balance, then weigh 0.025g of nano-polytetrafluoroethylene (purity 99.5%, average particle size 100nm) and place in the above In the mixed solvent, vibrate with an ultrasonic oscillator for 1.5 hours, then accurately weigh 4.5g of polyamide with an electronic balance and place it in the above mixed solvent, add a stirrer, stir on a magnetic stirrer for 10 hours, and configure it into a uniform and stable Spinning solution, number 1. Accurately weigh 13.2g of N-N dimethylformamide and 13.2g of tetrahydrofuran with an electronic balance and place them in a 50mL beaker. After stirring on a magnetic stirrer for 8 hours, it was configured into a uniform and stable spinning solution, numbered 2.

[0053] (2) use...

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Abstract

The invention discloses a high and low dielectric polymer composite electret filter material and a preparation method thereof. The composite electret filter material is composed of a main filter layerand an insulating filter layer coated on the upper and lower surfaces of the main filter layer, wherein the main filter function layer is composed of high dielectric electrospun nanofibers, and the insulating filter layer consists of low dielectric loss electrospun microfibers and organic electret nanoparticles dispersed in microfibers. The composite electret filter material of the invention hashigh charge storage density and charge storage stability, the surface electrostatic potential can be stably stabilized at 0.8-2.0KV for a long time, The filtration efficiency of PM2.5 is greater thanor equal to 98%, the filtration pressure drop is between 20-50Pa, the mechanical properties are good, the service life is long, the preparation process is simple, and the material has broad application prospects in the field of indoor environmental purification.

Description

technical field [0001] The invention belongs to the field of air purification and indoor air quality, and specifically relates to a high and low dielectric polymer composite electret filter material and a preparation method thereof, which is prepared by compounding polymers with different dielectric properties and has both high charge storage capacity and low Three-layer composite electret filter material with dielectric loss. Background technique [0002] Traditional mechanical filter materials also have high filtration resistance when achieving high filtration efficiency. Electret filter material introduces electrostatic capture on the basis of conventional physical interception, inertial collision and Brownian diffusion, which can improve particle capture efficiency without increasing filter resistance. [0003] At present, the surface charge and space charge of commercial electret filter materials are easy to dissipate, and the electret process is relatively complicated...

Claims

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Application Information

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IPC IPC(8): B01D39/16
CPCB01D39/1623B01D2239/0631B01D2239/0435
Inventor 蔡容容张立志潘安建黎树整
Owner SOUTH CHINA UNIV OF TECH
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