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A kind of oriented porous polyvinylidene fluoride piezoelectric film and its preparation method

A polyvinylidene fluoride piezoelectric and polyvinylidene fluoride technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the preparation conditions and equipment requirements, high voltage constant and energy conversion coefficient, complex process and other issues

Active Publication Date: 2021-07-30
WUHAN TEXTILE UNIV
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Problems solved by technology

[0005] 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, and cannot achieve high β crystal phase transition and β crystal phase transition. The orderly orientation arrangement, film formation and crystal phase transformation process are carried out separately, and the shortcomings of complicated procedures provide a simple operation, low requirements for preparation conditions and equipment, effective film formation, β crystal phase transformation and β crystal phase The preparation method of polyvinylidene fluoride piezoelectric film with soft characteristics is carried out synchronously in sequence orientation arrangement, and the prepared polyvinylidene fluoride piezoelectric film has high piezoelectric constant and energy conversion coefficient

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  • A kind of oriented porous polyvinylidene fluoride piezoelectric film and its preparation method

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preparation example Construction

[0019] A preparation method of an oriented porous polyvinylidene fluoride piezoelectric film, the preparation method is as follows:

[0020] A.Fe 3 o 4 Preparation of Polyvinylidene Fluoride Composite Solution with Nano Magnetic Particles Uniformly Dispersed

[0021] Fe with a diameter of 20-60nm 3 o 4 Nano magnetic particles are uniformly dispersed in polyvinylidene fluoride with a concentration of 5wt%-15wt%, Fe 3 o 4 The mass ratio of nanometer magnetic particles to polyvinylidene fluoride is 1 / 10-1 / 1.

[0022] B. The mold 2 is an insulating and magnetically permeable flat plate. A circular shallow groove with a depth of 1mm-3mm is opened on the insulating and magnetically permeable flat plate. The diameter of the shallow groove is less than or equal to the inner diameter of the magnetic ring 1. The vinylidene fluoride composite solution 3 is placed in the mold 2 for levelling, the mold 2 is placed above the magnetic ring 1 at a place whose vertical distance is 0.5-1 ...

Embodiment 1

[0026] A. Fe with a diameter of 20nm 3 o 4 Nanomagnetic particles are uniformly dispersed in a solution of polyvinylidene fluoride with a concentration of 5wt%, Fe 3 o 4 The mass ratio of nano magnetic particles to polyvinylidene fluoride is 1 / 10,

[0027] B. Take 0.71ml of the polyvinylidene fluoride compound solution prepared in step A and place it in the mold for leveling. The circular shallow groove in the mold is 1mm deep, and the diameter of the shallow groove is 3cm. The vertical distance above the magnetic ring where the mold is placed is At 1.5cm, the outer diameter of the magnetic ring is 3.6cm, the inner diameter is 3cm, and the thickness is 1cm. The magnetic field strength on the surface of the magnetic ring is 1000Gs. The magnetic ring can form a uniform magnetic field perpendicular to the liquid surface in the mold. The polyvinylidene fluoride composite solution Fe in 3 o 4 Under the combined action of magnetic field attraction and gravity, the magnetic nano...

Embodiment 2

[0029] A. Fe with a diameter of 40nm 3 o 4 Nanomagnetic particles are uniformly dispersed in a polyvinylidene fluoride solution with a concentration of 10wt%, Fe 3 o 4 The mass ratio of nano magnetic particles to polyvinylidene fluoride is 1 / 5,

[0030] B. Take 7.69ml of the polyvinylidene fluoride composite solution prepared in step A and place it in the mold for leveling. The circular shallow groove in the mold is 2mm deep, and the diameter of the shallow groove is 7cm. The vertical distance above the magnetic ring where the mold is placed is At 5.6cm, the outer diameter of the magnetic ring is 9.1cm, the inner diameter is 7cm, and the thickness is 1.3cm. The magnetic field strength on the surface of the magnetic ring is 4000Gs. The magnetic ring can form a uniform magnetic field perpendicular to the liquid surface in the mold. Polyvinylidene fluoride composite Fe in solution 3 o 4 Under the combined action of magnetic field attraction and gravity, the magnetic nanopart...

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Abstract

The invention relates to a preparation method of an oriented porous polyvinylidene fluoride piezoelectric film, belonging to the technical field of new material preparation. The present invention adopts Fe 3 o 4 Nano-magnetic particles are uniformly dispersed in polyvinylidene fluoride solution to form polyvinylidene fluoride composite solution, and then placed in a magnetic field to form a film, and the magnetic field induces Fe 3 o 4 Nano-magnetic particles aggregate into uniformly oriented cones. With the volatilization of the solvent, the nano-magnetic particles induce polyvinylidene fluoride β-phase crystallization and orientation arrangement on the cone surface to form Fe 3 o 4 / PVDF composite membrane, after drying it, remove Fe with dilute hydrochloric acid 3 o 4 Nano-magnetic particles to obtain oriented porous polyvinylidene fluoride piezoelectric film. The purpose of the present invention is to overcome the characteristics that the existing preparation technology cannot achieve high β crystal phase transition and its orderly orientation arrangement, and the obtained piezoelectric film has poor flexibility, and provide a method with simple operation and low requirements on preparation conditions and equipment. , the prepared oriented porous polyvinylidene fluoride piezoelectric film has soft characteristics and high piezoelectric constant and energy conversion coefficient.

Description

technical field [0001] The invention relates to a preparation method of an oriented porous 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 improve the electromechanical conversion efficiency of polyvinylidene fluoride piezoelectric film. 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 fluoride may be cast film formation of polyvinylidene fluoride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J9/26C08L27/16C08K3/22H01L41/193H01L41/45
CPCC08J5/18C08J2327/16C08K2003/2275H10N30/857H10N30/098
Inventor 柏自奎陈冲徐卫林周应山顾绍金陶咏真
Owner WUHAN TEXTILE UNIV