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Dielectric composite material and preparation method thereof

A composite material and dielectric technology, applied in the direction of electrospinning, rayon manufacturing, single-component halogenated hydrocarbon artificial filament, etc., can solve problems such as difficult to achieve dispersion

Inactive Publication Date: 2018-09-25
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary for dielectric materials to have high dielectric constant, high breakdown field strength and low dielectric loss, and it is difficult to achieve better dispersion when organic fillers are used to improve the dielectric properties of dielectric materials. Problem, provide a kind of dielectric composite material and preparation method thereof

Method used

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  • Dielectric composite material and preparation method thereof
  • Dielectric composite material and preparation method thereof
  • Dielectric composite material and preparation method thereof

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preparation example Construction

[0031] see figure 1 , the preparation method of the dielectric composite material of one embodiment comprises the following steps:

[0032] S110, performing hydroxylation treatment on the surface of the barium titanate particles.

[0033] In one embodiment, hydrogen peroxide is used to carry out hydroxylation treatment on the surface of barium titanate (BTO) particles. Further, the barium titanate particles are mixed with hydrogen peroxide for stirring and heat treatment.

[0034] In one embodiment, the rotation speed of stirring is 300rpm-700rpm, further, the rotation speed of stirring can be 500rpm; the temperature for hydroxylation treatment is 30°C-100°C, further, the temperature for hydroxylation treatment It can also be 70° C.; the time for the hydroxylation treatment is 100 min to 400 min, further, the time for the hydroxylation treatment can be 200 min, 250 min or 300 min.

[0035] In one embodiment, the particle size of the barium titanate particles is 5nm-200nm, f...

Embodiment 1

[0066] Weigh 15g of BTO particles with a particle size of 50nm, add it to a 150ml round bottom flask with a rotor, and measure 30wt% H 2 o 2 Pour 80ml into a round-bottomed flask, connect the condensing reflux device to the round-bottomed flask, seal it and put it in an oil bath to start stirring, set the temperature of the oil bath to 70°C, stir and reflux at 500rpm for 5h, pour the solution into a 150ml centrifuge tube, 10000rpm Centrifuge at a rotational speed for 20 minutes, wash with deionized water repeatedly three times, take out the lower layer of precipitated particles, put them into a vacuum oven at 90°C and dry for 12 hours to obtain hydroxylated BTO particles for storage for later use.

[0067] Weigh 1g of hydroxylated BTO particles, add it to a 20ml round bottom flask with a rotor, measure 7ml DMF solvent into the round bottom flask, 200W ultrasonic dispersion for 20min, measure 4.27ml TFEMA (0.03mol) monomer, Pour into the dispersed solution, stir at 300rpm for ...

Embodiment 2

[0069] Weigh 15g of BTO particles with a particle size of 50nm, add it to a 150ml round bottom flask with a rotor, and measure 30wt% H 2 o 2 Pour 80ml into a round-bottomed flask, connect the condensing reflux device to the round-bottomed flask, seal it and put it in an oil bath to start stirring, set the temperature of the oil bath to 70°C, stir and reflux at 500rpm for 5h, pour the solution into a 150ml centrifuge tube, 10000rpm Centrifuge at a rotational speed for 20 minutes, wash with deionized water repeatedly three times, take out the precipitated particles in the lower layer, put them into a vacuum oven at 90°C and dry for 12 hours to obtain hydroxylated BTO particles for storage for later use.

[0070]Weigh 1g of hydroxylated BTO particles, add it to a 20ml round bottom flask with a rotor, measure 7ml DMF solvent into the round bottom flask, 200W ultrasonic dispersion for 20min, measure 5.6ml HFBMA (0.03mol) monomer, Pour into the dispersed solution, stir at 300rpm fo...

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Abstract

The invention relates to a dielectric composite material and a preparation method thereof. The preparation method is characterized by comprising the following steps: carrying out hydroxylating treatment on the surfaces of barium titanate particles, then adding fluorine-containing monomers to initiate polymerization, and obtaining modified barium titanate with a core-shell structure; then using themodified barium titanate and a vinylidene fluoride-hexafluoropropylene copolymer to prepare and obtain an electrostatic spinning solvent, and then utilizing an electrostatic spinning process to obtain the dielectric composite material. The dielectric composite material and the preparation method have the beneficial effects that the barium titanate particles have a high dielectric constant, the vinylidene fluoride-hexafluoropropylene copolymer has a good breakdown property; by introduction of the fluorine-containing monomers, the monomer molecular chains have a certain quantity of fluorine atoms and are similar to a matrix polymer PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene) respectively, and the surfaces of the particles are coated with the monomers, so that the effect of mild transition is achieved, the compatibility between the particles and the matrix can be improved, further the particles have good dispersity, and the dielectric composite material has a high dielectric constant, high breakdown field strength and low dielectric loss.

Description

technical field [0001] The invention relates to the technical field of dielectric material preparation, in particular to a dielectric composite material and a preparation method thereof. Background technique [0002] Dielectric materials have good insulating properties, and their main use is in the preparation of capacitors. The principle of a capacitor is to place a dielectric material in an electric field, so that it can produce an electric polarization response to store energy. Taking advantage of the characteristics of dielectric materials, it can be widely used in many aspects such as medical equipment, new energy vehicles, pulse weapons, filters, and period energy storage. For a dielectric material, in order to obtain a better practical effect, it must have a high dielectric constant and a high breakdown strength. Low dielectric loss is also an essential factor. But in the actual process, it is difficult to achieve the unification of the three. This is because for in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/10C08K3/24D01F6/48D01F1/10D01D5/00
CPCC08K3/24C08K9/10D01D5/003D01F1/10D01F6/48C08L27/16
Inventor 沈洋张涛南策文
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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