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Sodium bismuth titanate-barium titanate/polyimide-based dielectric composite material and preparation method thereof

A technology of polyimide-based medium and sodium bismuth titanate, which is applied in the field of dielectric composite materials, can solve the problem of low dielectric constant of polymers, achieve the effect of improving relative dielectric constant, low cost, and simple process

Inactive Publication Date: 2019-04-16
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of the relatively low dielectric constant of polymers used in the preparation of dielectric capacitors, the invention provides a bismuth sodium titanate-barium titanate / polyimide-based dielectric composite material and a preparation method thereof

Method used

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  • Sodium bismuth titanate-barium titanate/polyimide-based dielectric composite material and preparation method thereof
  • Sodium bismuth titanate-barium titanate/polyimide-based dielectric composite material and preparation method thereof
  • Sodium bismuth titanate-barium titanate/polyimide-based dielectric composite material and preparation method thereof

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Embodiment 1

[0032] A bismuth sodium titanate-barium titanate / polyimide-based dielectric composite material, comprising a polyimide matrix and bismuth sodium titanate-barium titanate particles uniformly dispersed in the matrix, the bismuth sodium titanate - The doping amount of the barium titanate particles is 1-15 vol.% of the volume of the dielectric composite material.

Embodiment 2

[0034] A bismuth sodium titanate-barium titanate / polyimide-based dielectric composite material, comprising a polyimide matrix and bismuth sodium titanate-barium titanate particles uniformly dispersed in the matrix, the bismuth sodium titanate - The doping amount of the barium titanate particles is 1-15 vol.% of the volume of the dielectric composite material.

[0035] Wherein, the preparation method of sodium bismuth titanate-barium titanate particles is as follows: barium carbonate, bismuth oxide, sodium carbonate and titanium oxide are placed in a ball mill jar at a molar ratio of 0.06:0.47:0.47:1, and the ball-to-material ratio is 3~5:1 Add agate balls, use absolute ethanol as a dispersant, add absolute ethanol with a volume of 1 / 2 of the ball mill tank, put the ball mill tank into a star-type ball mill for the initial ball milling of wet ball milling, and the ball milling speed is 400~ 600r / min, the ball milling time is 6~12h, after the ball milling is completed, the obtai...

Embodiment 3

[0038] A bismuth sodium titanate-barium titanate / polyimide-based dielectric composite material, comprising a polyimide matrix and bismuth sodium titanate-barium titanate particles uniformly dispersed in the matrix, the bismuth sodium titanate - The doping amount of the barium titanate particles is 1-15 vol.% of the volume of the dielectric composite material.

[0039]Wherein, the preparation method of sodium bismuth titanate-barium titanate particles is as follows: barium carbonate, bismuth oxide, sodium carbonate and titanium oxide are placed in a ball mill jar at a molar ratio of 0.06:0.47:0.47:1, and the ball-to-material ratio is Add agate balls at 3:1, use absolute ethanol as a dispersant, add absolute ethanol with a volume of 1 / 2 of the ball milling tank, put the ball milling tank into a star-type ball mill for the initial ball milling of wet ball milling, the ball milling speed is 550r / min, The ball milling time is 12 hours. After the ball milling is completed, the obtai...

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Abstract

The invention discloses a sodium bismuth titanate-barium titanate / polyimide-based dielectric composite material and a preparation method thereof and belongs to the technical field of dielectric composite materials. In order to solve the problem that the dielectric constant of a polymer for preparing a dielectric capacitor is relatively low, according to the method, a solid-phase approach to preparing sodium bismuth titanate-barium titanate particles is utilized; 4,4'-diaminodiphenyl ether and the sodium bismuth titanate-barium titanate particles are added into N,N-dimethylformamide, and pyromellitic formic anhydride is added into the mixed solution to prepare a precursor solution; the precursor solution is prepared into a film and then subjected to imidization treatment to obtain the sodium bismuth titanate-barium titanate / polyimide-based dielectric composite material with the doping amount accounting for 1-15vol.% of the dielectric composite material and a high relative dielectric constant. When the dielectric composite material is used for the dielectric capacitor, the energy density of the dielectric capacitor can be increased, so that the dielectric composite material is applicable to electronic equipment requiring pulse power and further realizes miniaturization of the high-power electronic equipment.

Description

technical field [0001] The invention belongs to the technical field of dielectric composite materials, and in particular relates to a sodium bismuth titanate-barium titanate / polyimide-based dielectric composite material and a preparation method thereof. Background technique [0002] Film capacitors made of dielectric materials are the basis of all electronic components. Compared with fuel cells and other electrical energy storage devices, dielectric capacitors can release stored energy in a very short time to generate strong electrical pulses. This capability enables dielectric capacitors to be used in electronic devices that require pulsed power, such as medical defibrillators, transversely excited atmospheric lasers, and advanced electromagnetic systems, where the capacitor converts a low-power, long-duration input into a high-power, short-duration output. However, due to the relatively low dielectric constant of polymers used to fabricate dielectric capacitors, the energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626C04B26/20
CPCC04B26/20C04B35/475C04B35/622C04B35/62605C04B2235/3201C04B2235/3215C04B2235/6567C04B2235/95C04B18/023
Inventor 迟庆国赵学文张天栋张昌海王暄
Owner HARBIN UNIV OF SCI & TECH