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Lead-free BaTiO3-PVDF (polyvinylidene fluoride) composite membrane and preparation method thereof

A composite film and twinning technology, applied in chemical instruments and methods, film, film technology, etc., can solve the problems of low piezoelectric coefficient, lead content, environmental pollution, etc., and achieve dielectric and ferroelectric performance enhancement, dielectric and the effect of ferroelectric performance improvement and electromechanical coupling performance enhancement

Inactive Publication Date: 2019-08-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to make the piezoelectric coefficient of piezoelectric composite materials meet the requirements of use, the common method is to use lead-containing ceramics with large piezoelectric coefficients such as lead zirconate titanate (PZT) ceramics and organic polymer PVDF to prepare composite films, but zirconium Lead titanate contains lead, which seriously pollutes the environment and poses a great threat to human health
So people use lead-free and simple barium titanate (BaTiO 3 ) instead of lead zirconate titanate, prepared BaTiO 3 -PVDF composite film, however BaTiO 3 -The piezoelectric coefficient of PVDF composite film is low, which cannot meet the requirements of use

Method used

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  • Lead-free BaTiO3-PVDF (polyvinylidene fluoride) composite membrane and preparation method thereof
  • Lead-free BaTiO3-PVDF (polyvinylidene fluoride) composite membrane and preparation method thereof
  • Lead-free BaTiO3-PVDF (polyvinylidene fluoride) composite membrane and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0051] In this example, a lead-free BaTiO 3 -PVDF composite film, the doping mass fraction of setting composite film is 20%, comprises the following steps:

[0052] (1) BaTiO was prepared by alkali-thermal method 3 Twin powder, specifically comprises the following steps:

[0053] A, take by weighing anatase titanium dioxide powder 0.039g, sodium hydroxide 3.877g, potassium hydroxide 5.122g, mix together and put into the reactor;

[0054] b. Put the reaction kettle into the muffle furnace, keep it warm at 180°C for 300min, and cool it naturally;

[0055] c. Take out the reaction kettle, add dropwise 2ml of BaCl with a concentration of 0.3mol / L into the reaction kettle 2 solution;

[0056] d. Put the reaction kettle into the muffle furnace, keep it warm at 180°C for 2880min, and cool it naturally;

[0057] e. Take out the reaction kettle, pour the powder in the reaction kettle into a beaker, add an appropriate amount of deionized water to the beaker, stir for 5 minutes, let...

Embodiment 2

[0073] In this example, a lead-free BaTiO 3 -PVDF composite film, the doping mass fraction of setting composite film is 30%, comprises the following steps:

[0074] (1) BaTiO was prepared by alkali-thermal method 3 Twin powder, specifically comprises the following steps:

[0075] A, take by weighing anatase titanium dioxide powder 0.039g, sodium hydroxide 3.877g, potassium hydroxide 5.122g, mix together and put into the reactor;

[0076] b. Put the reaction kettle into the muffle furnace, keep it warm at 180°C for 300min, and cool it naturally;

[0077] c. Take out the reaction kettle, add dropwise 2ml of BaCl with a concentration of 0.3mol / L into the reaction kettle 2 solution;

[0078] d. Put the reaction kettle into the muffle furnace, keep it warm at 180°C for 2880min, and cool it naturally;

[0079] e. Take out the reaction kettle, pour the powder in the reaction kettle into a beaker, add an appropriate amount of deionized water to the beaker, stir for 5 minutes, let...

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Abstract

The invention discloses a lead-free BaTiO3-PVDF (polyvinylidene fluoride) composite membrane and a preparation method thereof. The lead-free BaTiO3-PVDF composite membrane contains BaTiO3 twin crystals. The preparation method of the lead-free BaTiO3-PVDF composite membrane comprises steps as follows: BaTiO3 twin crystal powder is taken as a raw material; an appropriate amount of the BaTiO3 twin crystal powder is added to an N,N-dimethyl formamide solution containing PVDF and mixed uniformly, then a glass slide is coated with the mixture, and after vacuum drying and quenching treatment are performed, BaTiO3 twin crystal-PVDF composite membrane is obtained. According to the preparation method, the mechanical-electrical coupling piezoelectric property of the lead-free BaTiO3-PVDF composite membrane is simply and effectively enhanced, and besides, dielectric and ferroelectric properties of the composite membrane are enhanced simultaneously. The BaTiO3 twin crystal-PVDF composite membrane is proposed and prepared for the first time, has excellent performance, adopts a simple preparation technology and facilitates large-scale application.

Description

technical field [0001] The present invention relates to the technical field of piezoelectric composite material preparation, and more specifically relates to a lead-free BaTiO 3 -PVDF composite membrane and preparation method thereof. Background technique [0002] Piezoelectric composite materials are widely used in medical treatment, sensing, measurement and other fields. They are composed of two or more materials. Common piezoelectric composite materials are two-phase composites of piezoelectric ceramics and polymers such as polyvinylidene fluoride or epoxy resins. This composite material combines the advantages of piezoelectric ceramics and polymers, has good flexibility and processability, and has a low density. It is easy to prepare a large and uniform film, and it is easy to mix with air, water, and biological Tissues, etc. to achieve acoustic impedance matching. [0003] In order to make the piezoelectric coefficient of piezoelectric composite materials meet the re...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/34B01D67/00
CPCB01D67/0079B01D67/0095B01D69/12B01D71/34B01D2323/46B01D2325/26
Inventor 刘运牙吴记彪山东良潘锴
Owner XIANGTAN UNIV
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