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Dielectric composite material based on paraffin-coated barium titanate nanoparticles and preparation method thereof

A nano-particle and barium titanate-coated technology, which is applied in the field of dielectric composite materials and its preparation, can solve the problems of uneven mixing, poor compatibility between ceramic phase and polymer matrix, etc., and achieve excellent mechanical properties and few defects , Excellent film-forming effect

Active Publication Date: 2017-03-22
云帆新材料集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to use paraffin wax with good film-forming and insulating properties to coat the surface of barium titanate spherical nanoparticles, prepare barium titanate@paraffin core-shell nanostructure particles and combine barium titanate@paraffin core-shell nanostructure The particles are used to prepare dielectric composite materials to overcome the problems of poor compatibility between the ceramic phase and the polymer matrix and uneven mixing in the prior art

Method used

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  • Dielectric composite material based on paraffin-coated barium titanate nanoparticles and preparation method thereof
  • Dielectric composite material based on paraffin-coated barium titanate nanoparticles and preparation method thereof
  • Dielectric composite material based on paraffin-coated barium titanate nanoparticles and preparation method thereof

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Embodiment 1

[0040] Hydroxylated barium titanate spherical nanoparticles coated with paraffin

[0041] Weigh 10.0 g of barium titanate spherical nanoparticles and disperse them into a 95:5 (v / v) ethanol / water mixed solution, stir and sonicate, collect the precipitate by centrifugation, and dry it in vacuum. Use H 2 o 2 The aqueous solution oxidizes barium titanate spherical nanoparticles to increase the hydroxyl content on its surface. The specific process is to add 100ml 30wt% H 2 o 2 and 10 g of barium titanate spherical nanoparticles, ultrasonically dispersed for 30 min, and then refluxed at 106 ° C for 6 h and kept stirring. After the reaction, cool down to room temperature, transfer the suspension to a 50ml centrifuge tube, and centrifuge at a speed of 9000r / min for 5min. After the centrifugation, pour the liquid in the upper layer, add deionized water, repeat washing twice, and place in the Dry in a vacuum oven at 80°C for 12 hours. Disperse 8.0 g of hydroxylated barium titanate...

Embodiment 2

[0043] Preparation of paraffin-coated barium titanate spherical nanoparticles (prepared in Example 1) and P(VDF-HFP) dielectric composite material;

[0044] First configure the P(VDF-HFP) solution of 8wt%, take by weighing 8g of P(VDF-HFP) resin particles, join in the mixed solvent that 92g prepares (V 丙酮 :V DMF =7:3), stirred at 60°C until it was completely dissolved and became a transparent solution. An appropriate amount of paraffin-coated barium titanate spherical nanoparticles was weighed and added to the P(VDF-HFP) solution to form mixed solutions with volume fractions of 10, 20, 30, 40 and 50 vol%, respectively, and stirred for 24 hours. Then the stirred suspensions were poured and casted on glass plates, dried at 80°C to form a film, and the obtained composite film was hot-pressed at 200°C and 15Mpa using a flat vulcanizer to form a dense composite film. Design a metal mask with a circular hole diameter of 2 mm and a hole center spacing of 4 mm. The shape of the meta...

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Abstract

The invention discloses a dielectric composite material based on paraffin-coated barium titanate nanoparticles. The preparation method comprises coating surfaces of barium titanate spherical particles having the sizes of 150-200nm with paraffin as a modifier with good film-forming properties and insulativity to obtain barium titanate@paraffin core-shell nanostructure particles, and compounding the nanostructure particles and a poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) polymer matrix so that dispersibility and compatibility of the nanostructure particles in the P(VDF-HFP) matrix are significantly improved. The percolation threshold of the paraffin-coated barium titanate / P(VDF-HFP) compound is higher than that of the barium titanate / P(VDF-HFP) compound. When the volume fraction of the paraffin-coated barium titanate nanoparticles in the compound is 50%, the dielectric constant of the compound is increased to 49.0 at 1kHz, and the loss is reduced to 0.06. When the volume fraction of the paraffin-coated barium titanate nanoparticles in the compound is 30%, the compound has an anti-breakdown electric field of 220kV / mm and has energy density of 13.85J / cm<3>.

Description

technical field [0001] The invention relates to a dielectric composite material based on paraffin-coated barium titanate nanoparticles and a preparation method thereof. Background technique [0002] High-performance dielectric composite materials are widely used in the fields of modern microelectronic devices such as capacitors, memories, transistors, and communication devices. In order to realize the miniaturization and adaptability of dielectric composite materials, it is required to have high relative permittivity, low dielectric loss, high energy storage density and excellent processability at the same time. In recent years, polymer-based ceramic dielectric composites have become one of the research hotspots due to the combination of high dielectric constant and low dielectric loss of ceramics and polymers. The added ceramics generally have a nanometer size, and the high surface energy makes it difficult to disperse evenly in high-viscosity polymers and not firmly bond ...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08L91/06C08K9/10C08K7/08
CPCC08J5/18C08J2327/16C08K2201/003C08K2201/011C08L27/16C08L2203/16C08L2203/20C08L91/06C08K9/10C08K7/08
Inventor 张斗周学凡罗行吴忠周科朝
Owner 云帆新材料集团有限公司
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