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 disadva

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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Example Embodiment

[0036] Example 1

[0037] A high-low dielectric polymer composite electret filter material and a preparation method thereof of the present embodiment, the specific steps are:

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

Example Embodiment

[0043] Example 2

[0044] A high-low dielectric polymer composite electret filter material and a preparation method thereof of the present embodiment, the specific steps are:

[0045] (1) Accurately weigh 13.2g N-N-dimethylformamide and 13.2g tetrahydrofuran with an electronic balance and place it in a 50mL beaker, then weigh 0.02g nano-polychlorotrifluoroethylene (purity 99.5%, average particle size 30nm) and place it in a 50mL beaker. 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, stir on a magnetic stirrer for 8 hours, and configure it into a uniform and stable solution. Spinning dope, numbered 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, and stir on a magnetic stirrer ...

Example Embodiment

[0050] Example 3

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

[0052] (1) Accurately weigh 12.75g N-N-dimethylformamide and 12.75g tetrahydrofuran with an electronic balance and place it in a 50mL beaker, then weigh 0.025g nano-polytetrafluoroethylene (purity 99.5%, average particle size 100nm) and place it on the above-mentioned In the mixed solvent, shake it with an ultrasonic oscillator for 1.5 hours, then use an electronic balance to accurately weigh 4.5 g of polyamide and place it in the above mixed solvent, add a stirrer, and stir on a magnetic stirrer for 10 hours to form a uniform and stable solution. Spinning dope, numbered 1. Accurately weigh 13.2g of N-N-dimethylformamide and 13.2g of tetrahydrofuran with an electronic balance and place it in a 50mL beaker, the number of the beaker is No. 2, then weigh 3.6g of polyvinyl chloride and place it in the above m...

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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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