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Pyroelectric composite material and preparation method and application in air purification

A composite material, pyroelectric technology, applied in the direction of climate change adaptation, electrostatic effect separation, chemical instruments and methods, etc., can solve the problem of difficult to apply air filter device, etc., to achieve the effect of excellent wear resistance and mechanical properties

Inactive Publication Date: 2016-12-07
北京中科艾加科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since lithium niobate is a crystalline material, it is difficult to apply to commonly used air filters due to the influence of its own shape that is difficult to change.

Method used

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  • Pyroelectric composite material and preparation method and application in air purification
  • Pyroelectric composite material and preparation method and application in air purification
  • Pyroelectric composite material and preparation method and application in air purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1, lithium niobate (LiNbO 3 ) Preparation of nanoparticles

[0043] LiNbO 3 The wafer is crushed and ground into powder, and then ball milled with a ball mill, and LiNbO with different particle sizes can be obtained by passing through screens of different meshes. 3 powder. Such as figure 1 shown. Because the large particles maintain the pyroelectric effect of the bulk crystal material, when the grain size is small to a certain scale, the pyroelectric effect is weakened or lost due to the instability of the polarization domain. When the particle size is larger than 180um, although the LN and LT particles maintain the same pyroelectric strength as the crystal material, their too large particle size is difficult to pass through the capillary and difficult to disperse during spinning, making the processing difficult to achieve . Therefore, the size range of the LN (LT) particles selected in the present invention is 100nm-180um.

Embodiment 2

[0044] Embodiment 2, pyroelectric lithium niobate (LiNbO 3 ) Preparation of nanocomposite spinning

[0045] The above-prepared LN powder and PP (or PVC) pellets were melt-blended at 200°C, cooled naturally after completion, and then spun by RH-7 capillary rheometer to obtain samples. By adjusting the spinning parameters, fiber materials with good mechanical properties and pyroelectric effect can be prepared. Such as figure 2 It can be seen that after filling LN particles with the same particle size, the morphology of the fiber changes greatly with the spinning speed.

Embodiment 3

[0046] Embodiment 3, the electrical property measurement of PP / LN nanocomposite material

[0047] In order to prove the pyroelectric effect of the prepared PP / LN nanocomposite, the electrical effect of the fiber under the action of temperature (100°C) was measured by an electrochemical workstation. The single fiber prepared by spinning is connected to the positive and negative electrodes, and the current signal formed by the generated charge is measured under heating conditions. Such as image 3 As shown, after the electrodes are connected, a current signal is generated, and the charge is released instantaneously. Under the same conditions, the pure PP fibers without pyroelectric particles do not appear current signals.

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Abstract

The invention relates to a pyroelectric composite material and a preparation method and application and a repeated regeneration method thereof. The pyroelectric composite material is prepared by blending pyroelectric crystal particles and a polymer electret material, wherein the pyroelectric crystal particles is a filling material and the polymer electret material is a matrix. The pyroelectric composite material has good pyroelectric effect of a pyroelectric crystal material and excellent wear resistance and mechanical property of a polymer matrix material, and can be applied in the field of air purification, such as adsorption of fine particles in atmospheric smog by electrostatic effect. In addition, the pyroelectric composite material can be rapidly and conveniently regenerated and can be made into various forms of fiber, mesh, fabric, etc. According to the invention, cost is saved, the material is repeatedly utilized, and service life of the material is prolonged. The material of the invention has a good application prospect.

Description

technical field [0001] The invention belongs to the field of electret air purification, and specifically relates to a polymer composite material with pyroelectric effect formed by compounding pyroelectric crystal particles as a filling material and a polymer electret material as a matrix, and its preparation Methods and applications. The prepared pyroelectric polymer composite material can be used as a filter screen in an air filter device to absorb fine particles in atmospheric haze by using electrostatic effect. Background technique [0002] In recent years, with the deterioration of air quality, the number of smoggy weather is increasing, which poses a great threat to human health. In recent years, in many places in my country, the phenomenon of haze weather has been incorporated into fog as a disastrous weather warning and forecast, collectively referred to as "smog weather". The main reason for its formation is that a large number of extremely fine dust particles, smo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/46D01F6/48D01F1/10B03C3/00
CPCB03C3/00D01F1/10D01F6/46D01F6/48Y02A50/2351
Inventor 关丽张美宁裘晓辉李化毅
Owner 北京中科艾加科技有限公司
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