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Piezoelectric electret material and preparation method thereof

A piezoelectric electret, electret technology, applied in the material selection of piezoelectric devices or electrostrictive devices, the manufacture/assembly of piezoelectric/electrostrictive devices, the selection of device materials, etc., can solve the problem of Limited charge storage, etc.

Active Publication Date: 2014-01-22
SHENZHEN HORN AUDIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a piezoelectric electret material and its preparation method for the problem that the closed pore structure limits the charge storage capacity.

Method used

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  • Piezoelectric electret material and preparation method thereof
  • Piezoelectric electret material and preparation method thereof
  • Piezoelectric electret material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] see image 3 , the preparation method steps of the piezoelectric electret material 200 in the above-mentioned first embodiment include the following steps:

[0047] Step S210 , providing the polymer layer 212 made of electret material and the elastic deformation layer 216 made of elastic material, wherein the elastic modulus of the elastic material is in the range of 0 MPa˜100 MPa.

[0048] The electret material can be selected from polytetrafluoroethylene (Polytetrafluoroethene, PTFE), fluorinated ethylene propylene copolymer (Fluorinated ethylene propylene, FEP), polypropylene (Polypropylene, PP), perfluoroalkoxy resin (Polyfluoroalkoxy, PFA ), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF) or polyethylene naphthalate (polyethylene naphthalate, PEN). The thickness of the polymer layer 212 may range from 0.1 μm to 2000 μm. For example, it may be 25 μm.

[0049] The elastic material of the elastic deformation layer 216 is selected from expanded p...

Embodiment 1

[0077] Preparation of piezoelectric electrets with PET / ePTFE (porous polytetrafluoroethylene, a type of polytetrafluoroethylene) structure

[0078] A composite membrane made of ePTFE material is provided. In this embodiment, ePTFE acts as both a polymer layer and an elastic deformation layer, and the outer surface of the composite membrane formed by the ePTFE material has a through-hole structure. The film thickness formed by ePTFE is 50 μm. An auxiliary layer made of PET material is formed between the ePTFE and an electrode, so that the electrode can more easily fit on the surface of the ePTFE film. The ePTFE film was polarized by the gridless corona polarization method with a polarization voltage of 30kV, and the polarization time was 1min. A first silver electrode and a second silver electrode with a thickness of 100 nm were respectively formed on the surface of the ePTFE film and the PET film by means of screen printing.

Embodiment 2

[0080] Preparation of piezoelectric electret materials with FEP / EPP structure

[0081] Provided is a polymer layer formed of FEP material with a thickness of 25 μm, and an elastically deformable layer formed of EPP material with a thickness of 50 μm. The bonding method is used to complete the polymer layer formed by FEP material and the elastic deformation layer formed by EPP material by using equipment and fixtures. Specifically, first stretch the EPP elastic deformation layer flat, then spray AB glue on the surface of the EPP elastic deformation layer, then cover the stretched FEP polymer layer on the surface of the AB adhesive layer, and then cure it at a temperature of 100°C. The curing time is 60min. The FEP polymer layer was polarized by a gridless corona polarization method with a polarization voltage of -30kV, and the polarization time was 1min. A first silver electrode and a second silver electrode with a thickness of 150 nm were respectively formed on the surface o...

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Abstract

A piezoelectric electret material comprises a composite membrane and an electrode, wherein the composite membrane comprises a polymer layer and an elastic deformation layer which are stacked sequentially; the polymer layer is made of an electret material and used for storing charge; and the elastic deformation layer is made of an elastic material. The electrode is made of a conductive material and comprises a first electrode and a second electrode formed on the two opposite sides of the composite membrane. When the piezoelectric electret material suffers an external mechanical action, the elastic deformation layer deforms, and the induced charge on the electrode is changed, so that an external circuit shows short-circuit current or open-circuit voltage, and the piezoelectric electret material has relatively good piezoelectric property. The piezoelectric electret material forms a closed hole structure without special treatment, so that the charge storage capacity in a piezoelectric electret is not limited. Simultaneously, the invention provides a preparation method of the piezoelectric electret material.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a piezoelectric electret material and a preparation method thereof. Background technique [0002] Piezoelectret (Piezoelectret) is a new type of electromechanical / motor conversion material with both piezoelectric and electret properties. After being subjected to a strong polarizing electric field, this material stores a large amount of space charge or oriented dipole charge inside. When the surface is coated with a metal electrode layer, it is elastically deformed by external mechanical action, and the induced charge on the electrode changes accordingly. Show short circuit current or open circuit voltage on external circuit. This piezoelectric electret based on polymer materials has a very high piezoelectric coefficient, and at the same time has the general characteristics of polymer materials, such as light weight, thin thickness, high toughness, soft and easy to b...

Claims

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Application Information

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IPC IPC(8): H01L41/18H01L41/37
Inventor 陈政朱彪梁海郑洁
Owner SHENZHEN HORN AUDIO
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