Barium titanate/polyvinylidene fluoride composite dielectric film and preparation method thereof

A technology of composite dielectric film and polyvinylidene fluoride, which is applied in the field of barium titanate/polyvinylidene fluoride composite dielectric film and its preparation, can solve rare and other problems, achieve smooth surface, improve film-forming performance, and film layer uniform effect

Active Publication Date: 2012-07-11
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ceramic-polymer composite thin-film dielectric materials with a dielectric constant of more than 50, a thickness of less than 50 μm, and excellent mechanical properties are still very rare.

Method used

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  • Barium titanate/polyvinylidene fluoride composite dielectric film and preparation method thereof
  • Barium titanate/polyvinylidene fluoride composite dielectric film and preparation method thereof
  • Barium titanate/polyvinylidene fluoride composite dielectric film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] By BaTiO 3 Stoichiometric Dosage Ratio Weighing BaCO 3 and TiO 2 , put into the agate mixing tank, add agate balls and alcohol, the volume ratio of agate balls, alcohol and powder is 6:2:1, mix on a planetary ball mill or a three-roll mixer for 24h; in an oven at 100 After drying at ℃~120℃, calcining in air at 1100℃ for 4h to obtain BaTiO 3 Ceramic powder; the SEM photo of the powder is as follows figure 1 As shown, the particle size distribution of the powder is uniform, and the average particle size is less than 500nm.

[0038] Measure a certain amount of NMP with a graduated cylinder and add PAA with a dropper, mix well, wherein the volume fraction of PAA is 3%. Add PVDF powder to the mixed solvent of NMP and PAA at a mass percentage concentration of 25%, stir well and place it in an oven, and heat at 80°C for 1 hour to fully dissolve the PVDF polymer powder. Configure to obtain PVDF solution.

[0039] By BaTiO 3 The mass ratio of BaTiO to PVDF is m: 1 3 The ...

Embodiment 2

[0045] Using BaTiO purchased from the market 3 Ceramic powder (the average particle size of the powder is less than 500nm, the SEM photo is as follows Figure 6 Shown) is raw material, and the mass ratio that adopts and embodiment 1 to prepare BTO and PVDF is the BTO / PVDF colloid of m=3.0 and m=4.0, and carry out thin film spinning on the homogenizer, then thin film is placed in ion Soak in water for 20s, extract the NMP / PAA composite liquid solvent in the film colloid to obtain a gel-state BTO / PVDF composite film, and finally dry it in an oven at a temperature of 80°C to finally obtain a BTO / PVDF composite dielectric film. The throwing process parameters of the film are shown in Table 2.

[0046] Table 2

[0047]

[0048] The same method as in Example 1 was used to test the dielectric constant and dielectric loss of the film in the frequency range of 20 Hz to 1 MHz. Test results such as Figure 7 and Figure 8 shown. The test results show that in the frequency range...

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Abstract

The invention provides a barium titanate/polyvinylidene fluoride composite dielectric film and a preparation method thereof. The film comprises barium titanate and polyvinylidene fluoride with the weight ratio of 1.5-5.0:1, and the thickness of the film is less than 50 mu m. In the frequency range of 100 Hz-1 MHz, the relative dielectric constant of the film can reach more than 70, and the dielectric loss is lower than 5*10<-2>. By compounding BaTiO3 ceramic and PVDF polymer, the dielectric film material with high dielectric constant and low dielectric loss is prepared. According to the invention, the barium titanate/polyvinylidene fluoride composite dielectric film with uniform distribution of ceramic particles, controllable thickness, high dielectric constant and low dielectric loss is prepared by preparing barium titanate ceramic powder through solid phase reaction or chemical coprecipitation and then using high temperature drying gel method or solvent induced phase separation gel method. The dielectric film is especially suitable for capacitor, ferroelectric memory, and other electronic devices.

Description

technical field [0001] The invention relates to a barium titanate / polyvinylidene fluoride composite dielectric film and a preparation method thereof. The dielectric film is especially suitable for electronic devices such as capacitors and ferroelectric memories, and belongs to the technical field of dielectric film material preparation. Background technique [0002] Capacitors using flexible film materials as dielectric materials are widely used in the electronics industry. Typically, such capacitors use polymer dielectric films. Polymer dielectric films are flexible, withstand high voltages, and are often self-healing. However, the dielectric constant of polymer dielectric materials is usually very low, and it is difficult for the prepared capacitor devices to meet the increasingly high miniaturization requirements in the electronics industry. [0003] Ferroelectric ceramic materials have a very high dielectric constant and are a very important class of dielectric materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K3/24C08J9/28C08J5/18
Inventor 崔建东毛昌辉杨剑刘坤
Owner GRIMAT ENG INST CO LTD
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