Method for preparing composite polymer electret

A composite polymer and electret technology, applied in chemical instruments and methods, layered products, lamination devices, etc., can solve the problems of electret charge attenuation, limited application, etc., to achieve difficult attenuation, good resistance to alcohol cleaning performance, the effect of good surface potential stability

Active Publication Date: 2013-08-14
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing electret materials have a fatal shortcoming. After being placed for a long time or in a humid environment, the charge of the electret is prone to decay, especially in an organic solvent environment, which greatly limits its application. application

Method used

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  • Method for preparing composite polymer electret
  • Method for preparing composite polymer electret
  • Method for preparing composite polymer electret

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of polytetrafluoroethylene (PTFE) / polyvinylidene fluoride (PVDF) / polytetrafluoroethylene (PTFE) three-layer composite polymer electret comprises the following steps:

[0039] (1) Preparation of composite membrane: Cover a layer of PVDF powder layer with a thickness of 25 μm on a PTFE membrane with a thickness of 50 μm, and then cover a layer of PTFE membrane with a thickness of 50 μm on the PVDF powder layer, and then use a flat vulcanizer After being pressed at a temperature of 180°C and a pressure of 25MPa for 5 minutes, cool to room temperature to make them stick together;

[0040] (2) Formation of electret: injecting the composite film prepared in step (1) by means of corona polarization or thermal polarization;

[0041] Wherein, the corona polarization injector condition is: under the condition of keeping the temperature at 100°C, charge with a voltage of 10kV for 5min, then keep the voltage constant to lower the temperature to room temperature...

Embodiment 2

[0045] The preparation method of fluorinated ethylene propylene copolymer (FEP) / polyvinylidene fluoride (PVDF) / fluorinated ethylene propylene copolymer (FEP) three-layer composite polymer electret comprises the following steps:

[0046] (1) Preparation of composite membrane: Cover a layer of PVDF powder layer with a thickness of 25 μm on the FEP membrane with a thickness of 50 μm, and then cover a layer of FEP membrane with a thickness of 50 μm on the PVDF powder layer, and then use a flat vulcanizer to After pressing at 180°C and 25MPa pressure for 5 minutes, cool to room temperature to make them stick together;

[0047] (2) Formation of electret: injecting the composite film prepared in step (1) by means of corona polarization or thermal polarization;

[0048] Wherein, the corona polarization injector condition is: under the condition of keeping the temperature at 100°C, charge with a voltage of 10kV for 5min, then keep the voltage constant to lower the temperature to room t...

Embodiment 3

[0052] The preparation method of polytetrafluoroethylene (PTFE) / vinylidene fluoride and trifluoroethylene copolymer (P(VDF-TrFE) / polytetrafluoroethylene (PTFE) three-layer composite polymer electret comprises the following steps:

[0053] (1) Preparation of composite membrane: first cover a layer of P(VDF-TrFE) membrane with a thickness of 10 μm on a PTFE membrane with a thickness of 25 μm, and then cover a layer with a thickness of 25 μm on the P(VDF-TrF)E membrane The PTFE film is then pressed with a flat vulcanizing machine at a temperature of 200 ° C and a pressure of 20 MPa for 5 minutes, and then cooled to room temperature to make it bond together;

[0054] (2) Formation of electret: injecting the composite film prepared in step (1) by means of corona polarization or thermal polarization;

[0055] Wherein, the conditions of the corona polarization injector are as follows: under the condition of keeping the temperature at 110°C, charge with a voltage of 10kV for 5min, the...

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Abstract

The invention relates to a method for preparing a composite polymer electret. The method for preparing the composite polymer electret comprises the following steps: (1) preparation of a composite membrane: based on a functional polymer layer as an intermediate layer, covering a teflon or fluorinated ethylene propylene copolymer membrane at one side of the intermediate layer, and covering a teflon or fluorinated ethylene propylene copolymer membrane at the other side of the intermediate layer, thereby obtaining the composite membrane through suppressing and bonding; and (2) formation of the electret: injecting the composite membrane prepared from the step (1) by adopting a corona polarization or hot polarization method. The composite polymer electret prepared by the method has favorable surface potential stability; the polymer composite membrane is stored at normal temperature for a long time after being injected, and the potential is unchanged basically; meanwhile, the composite polymer electret also has favorable alcohol-resistant cleaning performance; and the composite membrane wiped by alcohol cotton is stored at normal temperature for a long time, and the potential is also unchanged basically, which shows that in a damp environment, or even in an organic solvent environment, the electret charge also cannot be attenuated easily.

Description

technical field [0001] The invention belongs to the field of electrical materials, and in particular relates to a preparation method of a composite polymer electret with long-term charge storage capacity. Background technique [0002] Electrets refer to functional dielectric materials with the ability to store electric charges for a long time, and electrostatic effect, piezoelectric effect and pyroelectric effect are their basic physical effects. By applying a strong electric field to some dielectric materials with special properties, and using certain physical and chemical methods to make the charge or electric polarization state stay on the dielectric for a long time, a long-lived electret can be made. [0003] Using various physical effects of electret materials, such as electrostatic effect, piezoelectric effect, pyroelectric effect and second-order nonlinear optical effect, etc., it has shown excellent application prospects in the construction of integrated sensors and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/00
Inventor 陈钢进肖慧明赵延海
Owner HANGZHOU DIANZI UNIV
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