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Filter device comprising piezoelectric composite material and its use in adsorption of atmospheric particulate matter

An atmospheric particulate matter and filter device technology, applied in the field of air purification, can solve the problems of easy generation of ozone, consumption of energy, temperature safety problems, etc., and achieve the effects of prolonging the service life, improving the service life, and stably storing electric charges

Active Publication Date: 2021-02-26
北京中科艾加科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the plasma technology, ozone is easily generated due to the high voltage required for the generation of plasma during the adsorption process; and the organic electret that utilizes pyroelectric properties still consumes energy, and the increase in temperature during the adsorption process may cause create security issues

Method used

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  • Filter device comprising piezoelectric composite material and its use in adsorption of atmospheric particulate matter
  • Filter device comprising piezoelectric composite material and its use in adsorption of atmospheric particulate matter
  • Filter device comprising piezoelectric composite material and its use in adsorption of atmospheric particulate matter

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preparation example Construction

[0043] Wherein, the preparation method of described composite material comprises the steps:

[0044] 1) Prepare a lithium niobate piezoelectric crystal and polarize it in orientation, and prepare particles with a size range between 100nm and 50 μm, that is, the lithium niobate particles after the single domain polarization;

[0045] 2) Uniformly mixing the monodomain polarized lithium niobate particles in step 1) with polymer electret, optionally carbon nanotubes (such as multi-walled carbon nanotubes) through a twin-screw extruder to prepare masterbatch;

[0046] 3) The above prepared masterbatch is prepared into a non-woven fabric by melt spraying or film-forming treatment is prepared into a film.

[0047] In step 1) of the above-mentioned preparation method, the preparation of the lithium niobate particles after the monodomain polarization is specifically:

[0048] The lithium niobate piezoelectric crystal after monodomain orientation is ground into powder by grinding, si...

Embodiment 1

[0062] Embodiment 1 prepares film

[0063] Films were prepared as follows:

[0064] (1) Prepare a lithium niobate (LN) piezoelectric crystal and polarize it in orientation, grind it into powder by grinding, pass the powder through a 300-mesh sieve, and collect the sieved LN powder.

[0065] (2) LN powder mixed with multi-walled carbon nanotubes (CNT) and polypropylene (PP) to prepare a masterbatch

[0066] In a twin-screw extruder, mix PP, CNT (1wt%) and the LN powder obtained in step (1) of different mass ratios (1%, 3%, 5%, 8% and 10%), granulate, Get masterbatch.

[0067] (3) Film forming by hot pressing: melt the masterbatch in step (2) at 200° C., form a film under a pressure of 8 MPa, and obtain a film after cooling; cut the obtained film into a rectangle (2cm×3cm) for later use.

Embodiment 2

[0068] Embodiment 2 prepares non-woven fabric

[0069] (1) Prepare a lithium niobate (LN) piezoelectric crystal and polarize it in orientation, grind it into powder by grinding, pass the powder through a 300-mesh sieve, and collect the sieved LN powder.

[0070] (2) LN powder mixed with multi-walled carbon nanotubes CNT and PP to prepare masterbatch

[0071] In a twin-screw extruder, mix PP, CNT (1wt%) and the LN powder obtained in step (1) with different mass ratios (1%, 3%, 5%, 8% and 10%), and granulate.

[0072] (3) The masterbatch prepared above is prepared into a non-woven fabric by melt spraying.

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Abstract

The invention discloses a filter device comprising a piezoelectric composite material and its application in the adsorption of atmospheric particles. The filter layer in the filter device does not need an external power supply, and only relies on deformation under external pressure stimulation to generate charges, so it can It is charged repeatedly and can store electric charge stably, thus prolonging the service life. The filter device can be used for adsorbing atmospheric particles, that is, it can directly capture polar fine particles in the atmosphere, and can also polarize neutral particles and then capture them. The method has no selectivity for the size of the particles, and especially has high adsorption efficiency for fine particles of micro-nano scale.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a filter device comprising a piezoelectric composite material and its application in adsorbing atmospheric particles. Background technique [0002] The emergence and continuation of smog has seriously affected people's daily life, brought great harm to people's health, and aroused widespread concern and attention from the society. Haze is mainly composed of sulfur dioxide, nitrogen oxides and inhalable particulate matter, the former two are gaseous pollutants, and inhalable particulate matter is the primary cause of aggravating haze weather pollution, especially PM 10 and PM 2.5 , attracting more and more attention. where PM 2.5 Because of its smaller particle size and larger specific surface area, compared with coarse particles, it is easier to accumulate toxic substances, such as bacteria and heavy metal ions, and thus has a very large impact on human he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C3/04B03C3/66
Inventor 李秀双卫娜牛琳刘磊
Owner 北京中科艾加科技有限公司
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