Method for preparing porous polymer piezo-electric electret thin film

A technology of porous polymers and piezoelectric electrets, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of not being able to form ideal porous Structure, limit the application of functional materials, piezoelectric activity reduction and other issues, to achieve the effect of novel concept, high thermal stability, and improved thermal stability

Inactive Publication Date: 2006-10-11
DONGGUAN LANMU MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commercial porous PP electret piezoelectric film is limited by the thermal stability of the electret itself of the PP material, and its working temperature generally cannot exceed 60°C. Above this temperature, its piezoelectric activity will decrease or even disappear due to the aggravation of charge attenuation. , limiting the application of such functional materials
However, some other electret materials with high thermal stability (such as PTFE, FEP, COC, PET, PI, etc.) cannot form an ideal porous structure due to the limitations of traditional film-making processes. Porous Polymer Piezoelectret Thin Films with High Voltage Electroactivity Reported

Method used

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  • Method for preparing porous polymer piezo-electric electret thin film
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  • Method for preparing porous polymer piezo-electric electret thin film

Examples

Experimental program
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Embodiment 1

[0031] Embodiment 1, a metal grid is used, and the mesh is a 1mm×1mm square hole. Film 1 is made of FEP film (two layers) with a film thickness of 12.7 μm; film 2 is made of PTFE film (three layers) with a film thickness of 3 μm. The pressing temperature is 280°C; the pressing time is 15 minutes; and the pressing pressure is 4kPa. The corona electrode is needle-shaped; the corona voltage is 32kV; there is no grid control voltage; the charging temperature is 20°C; the charging time is 60s; the distance between the corona electrode and the sample is 7cm. Aluminum electrodes of 100 nm were vacuum-deposited on both sides of the porous membrane.

Embodiment 2

[0032] In embodiment 2, a metal grid is used, and the mesh is a square hole of 0.125mm×0.125mm. Film 1 is made of FEP film (one layer) with a film thickness of 12.7 μm; film 2 is made of PTFE film (two layers) with a film thickness of 3 μm. The pressing temperature is 280°C; the pressing time is 5 minutes; and the pressing pressure is 4kPa. The corona electrode is needle-shaped; the corona voltage is 64kV; there is no grid control voltage; the charging temperature is 25°C; the charging time is 40s; the distance between the corona electrode and the sample is 4cm. Aluminum electrodes of 100 nm were vacuum-evaporated on both sides of the porous membrane.

Embodiment 3

[0033] Embodiment 3, a metal grid is used, and the mesh is a square hole of 0.125mm×0.125mm. Film 1 is made of FEP film (one layer) with a film thickness of 12.7 μm; film 2 is made of PTFE film (two layers) with a film thickness of 3 μm. The pressing temperature is 280°C; the pressing time is 10 minutes; and the pressing pressure is 4kPa. The corona electrode is needle-shaped; the corona voltage is 5kV; there is no grid control voltage; the charging temperature is 20°C; the charging time is 10 minutes; the distance between the corona electrode and the sample is 10cm. Aluminum electrodes of 100 nm were vacuum-deposited on both sides of the porous membrane.

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Abstract

The disclosed preparation method for a porous polymer piezoelectric electret film comprises: for the porous polymer film, overlaying polymer films with different melting points into a composite film with grid on one or two surfaces; forcing with pressure as 1-10MPa at some temperature for 2-120min; then charging the composite film by means of corona charge, contact charge or electron beam charge. This invention can obtain product with high thermal stability and voltage activity.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation method of a porous polymer piezoelectric electret film. technical background [0002] The polymer film with a porous structure exhibits outstanding piezoelectric properties after proper electric polarization treatment. It has the characteristics of piezoelectric materials and electrets at the same time, and is named porous polymer piezoelectric electret film, piezoelectric electret Body or ferroelectret, it is a new type of electromechanical sensor material developed around 1990. Piezoelectricity of Porous Polymer Electret Piezoelectric Films 33 The coefficient is an order of magnitude higher than the piezoelectric activity of the ferroelectric polymer PVDF and its copolymer P(VDF / TrFE); compared with the piezoelectric ceramic material, the porous polymer electret piezoelectric film has a higher voltage electricity d 33 In addition to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/26H01L41/45
Inventor 张晓青夏钟福
Owner DONGGUAN LANMU MATERIAL TECH
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