Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of polyvinylidene fluoride piezoelectric film

A polyvinylidene fluoride piezoelectric and polyvinylidene fluoride technology, which is applied in the manufacture/assembly of piezoelectric/electrostrictive devices, etc. Problems such as the inability to continuously process large-area polyvinylidene fluoride piezoelectric films

Inactive Publication Date: 2016-07-06
WUHAN TEXTILE UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned existing problems, the purpose of the present invention is to overcome the relatively harsh requirements on the preparation conditions and equipment in the preparation technology of the existing polyvinylidene fluoride piezoelectric film or to easily produce defects, which cannot achieve high β crystal phase transition and β crystal phase transition. The orderly orientation arrangement, can not process large-area polyvinylidene fluoride piezoelectric film continuously, the film formation and crystal phase transformation process are carried out separately, and the process is complicated. It provides a simple operation and low requirements on preparation conditions and equipment. , a method for preparing a polyvinylidene fluoride piezoelectric film in which film formation and polarized crystal phase transition are carried out simultaneously, and the prepared polyvinylidene fluoride piezoelectric film has a high piezoelectric constant

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of polyvinylidene fluoride piezoelectric film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation of polyvinylidene fluoride piezoelectric film, according to the following steps:

[0021] a configuration of polyvinylidene fluoride solution

[0022] Dissolving polyvinylidene fluoride powder into a solvent, stirring at room temperature for 3 hours to 8 hours, to obtain a polyvinylidene fluoride solution with a concentration percentage of 1 wt% to 15 wt%, and the solvent is N,N-dimethylformamide or Either dimethylacetamide or dimethylsulfoxide.

[0023] b Preparation of the mold assembly

[0024] Described mold device is made up of mold (2), lower conductive plate (1), upper conductive plate (4), lower electrode wire (5), upper electrode wire (6) and DC power supply (7), and mold ( 2) It is an insulating flat plate with a shallow groove of 1mm-3mm deep, and a lower conductive electrode plate (1) with the same area as the shallow groove is placed on the bottom surface of the shallow groove, and the thickness of the lower conductive electrode plate (1) ...

Embodiment 1

[0031] a configuration of polyvinylidene fluoride solution

[0032] The polyvinylidene fluoride powder was dissolved in a solvent, and stirred at room temperature for 3 hours to obtain a polyvinylidene fluoride solution with a concentration of 1 wt %, and the solvent was N,N-dimethylformamide.

[0033] b Preparation of the mold assembly

[0034] Described mold device is made up of mold (2), lower conductive plate (1), upper conductive plate (4), lower electrode wire (5), upper electrode wire (6) and DC power supply (7), and mold ( 2) It is an insulating flat plate with a 1mm deep shallow groove, and a lower conductive electrode plate (1) with the same area as the shallow groove is placed on the bottom surface of the shallow groove, and the thickness of the lower conductive electrode plate (1) is 0.1mm. The lower conductive electrode plate (1) is led outside the mold (2) through the lower electrode wire (5), and an upper conductive electrode plate (4) of equal area is fixedly in...

Embodiment 2

[0038] a configuration of polyvinylidene fluoride solution

[0039] The polyvinylidene fluoride powder was dissolved in a solvent, and stirred at room temperature for 3 hours to obtain a polyvinylidene fluoride solution with a concentration of 5 wt %, and the solvent was dimethylacetamide.

[0040] b Preparation of the mold assembly

[0041] Described mold device is made up of mold (2), lower conductive plate (1), upper conductive plate (4), lower electrode wire (5), upper electrode wire (6) and DC power supply (7), and mold ( 2) It is an insulating flat plate with a 2mm deep shallow groove, and a lower conductive electrode plate (1) with the same area as the shallow groove is placed on the bottom surface of the shallow groove, and the thickness of the lower conductive electrode plate (1) is 0.2mm. The lower conductive electrode plate (1) is led outside the mold (2) through the lower electrode wire (5), and an upper conductive electrode plate (4) of equal area is fixedly inst...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for manufacturing a PVDF piezoelectric film and belongs to the technical field of manufacturing of new materials. According to the method for manufacturing the PVDF piezoelectric film, an electric field is added in the process of film formation of a casting PVDF solution, the electric field induces beta-phase crystallization of PVDF in the PVDF solution and orderly orientation distribution of beta crystal phases in the direction of the electric field, so that the obtained PVDF piezoelectric film has a high piezoelectric constant, and the acoustical-electrical conversion efficiency and the electro-mechanical conversion efficiency of the PVDF piezoelectric film during energy capture and the like in the environment are improved. The method aims to overcome the defects that in the existing PVDF piezoelectric film manufacturing technology, high beta crystal phase conversion and orderly orientation distribution of beta crystal phases cannot be achieved, and the film formation process and the crystal phase conversion process are executed separately; the operation is simple, film formation and polarized crystal phase conversion are conducted simultaneously, and the PVDF piezoelectric film manufactured through the method has a high piezoelectric constant.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride piezoelectric film, belonging to the technical field of preparation of new materials. Background technique [0002] Polyvinylidene fluoride (PVDF) is a semi-crystalline polymer composed of layered crystals and amorphous regions. It can crystallize into four crystal phases of α, β, γ and δ under different conditions, of which only strong polarity The β phase has piezoelectric properties. Increasing the proportion of β-phase in PVDF film and making its orientation arrangement is the key to improving the electromechanical conversion efficiency of polyvinylidene fluoride piezoelectric film in acoustic-electric conversion and energy capture in the environment. At present, the polyvinylidene fluoride piezoelectric film is prepared by first preparing the polyvinylidene fluoride film, and then undergoing a process of crystal transformation. The film formation of polyvinylidene fluorid...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/45C08J9/28C08L27/16
Inventor 柏自奎方东屈永明陶咏真张宏伟许杰徐卫林
Owner WUHAN TEXTILE UNIV