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Electret and printing method thereof

A technology of electret and polar sheet, which is applied in the field of electret and its printing, can solve problems such as uneven charge distribution, and achieve the effects of reducing preparation costs, excellent electrical properties, and excellent piezoelectricity

Pending Publication Date: 2022-07-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of uneven charge distribution of traditional electrets. On the one hand, it provides an electret with uniform charge distribution; on the other hand, it provides an electret printing method. evenly distributed

Method used

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  • Electret and printing method thereof
  • Electret and printing method thereof
  • Electret and printing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The electret provided in this embodiment includes a substrate and a multilayer electret sheet printed on the substrate. The electret is in the form of a sheet, and the potential difference between any two points on the same surface of the electret is not greater than 50 milliseconds. Volts; the thickness difference at different positions of the electret is not more than 15 microns. Electret Structure Reference figure 1 shown, it is a flexible electret.

[0040] The preparation material of the electret includes a polymer dielectric material, an organic solvent, and acetone. The mass fraction of the polymer dielectric material is 8%-14%, the mass fraction of the organic solvent is 40%-70%, and the mass fraction of acetone is 32%-56%; the preparation materials can also include two-dimensional materials, the two-dimensional materials are graphene, carbon nanotubes, piezoelectric ceramics, etc., and the mass fraction of the two-dimensional materials is 0.01%-0.05%; used to ...

Embodiment 2

[0053] The electret printing method provided by this embodiment includes the following steps:

[0054] S1, configure printing ink;

[0055] The printing ink includes polymer dielectric material, organic solvent and acetone, and the mass fraction of polymer dielectric material is 8%-

[0056] 14%, the mass fraction of organic solvent is 40%-70%, and the mass fraction of acetone is 32%-56%;

[0057] After mixing, heat at 40-60°C for 2-5 hours;

[0058] The polymer dielectric material is polyvinylidene fluoride, a copolymer of vinylidene fluoride or trifluoroethylene; the organic solvent is dimethylformamide or N-methylpyrrolidone.

[0059] S2. Lay out the substrate to print layer by layer, and inject electric charge during printing to make the electric charge enter the electret body;

[0060] The printing voltage is controlled to be 2-5kV, the substrate temperature is 40-80℃, the flow rate of the propelling pump is 0-2ml / h, and the models of the printing needles are needles #...

Embodiment 3

[0081] The difference between this embodiment and the second embodiment is that the printing ink also includes two-dimensional materials. The two-dimensional materials are graphene, carbon nanotubes, piezoelectric ceramics, etc., and the mass fraction of the two-dimensional materials is 0.01%-0.05%; The internal charge density distribution and stability of the electret material affects the crystallization, grain size and phase transition of the material, thereby improving the stability of the electret.

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PUM

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Abstract

The invention relates to the technical field of solid dielectric media, in particular to an electret and a printing method thereof. The electret comprises a substrate and multiple layers of electret sheets printed on the substrate, the electret is in a sheet shape, and the potential difference between any two points on the same surface of the electret is not larger than 50 millivolts. According to the electret, charges are uniformly distributed in the thin film to form an electret material with high charge density, and the electret material shows excellent piezoelectric and ferroelectric properties, such as a giant electrostriction coefficient; and the electrical performance is excellent. And the electret is directly obtained through 3D printing, and polarization treatment is not needed after printing is completed, so that the preparation process is simplified, and the preparation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of solid dielectrics, in particular to an electret and a printing method thereof. Background technique [0002] An electret is a persistently polarized solid dielectric material in which charge dipoles are stored. Due to the directional arrangement of charge dipoles inside the electret material, the material will exhibit piezoelectric and ferroelectric properties. At the same time, the electret material is widely used in electret microphones, sensors, Piezoelectric ferroelectric devices and optoelectronic devices such as generators and energy harvesters. [0003] Existing electrets are polarized and charged by methods such as corona polarization, electrode polarization, and ion beam charge injection, so that they can store charges inside. However, the electret polarized by the above-mentioned polarization method has uneven internal charge distribution, and also has the problem that the polarization efficie...

Claims

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Application Information

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IPC IPC(8): H01G7/02H01G13/00B33Y80/00B33Y10/00
CPCH01G7/02H01G13/00B33Y80/00B33Y10/00
Inventor 姜潮张宁一梁钊董小兵钱企豪
Owner HUNAN UNIV
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