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Highly dielectric composite material containing core-shell structured packing and preparation method thereof

A composite material and shell structure technology, applied in the field of composite materials, can solve problems such as immaturity, and achieve the effects of simple processing, reduced dielectric loss, and a wide range of sources.

Inactive Publication Date: 2008-10-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology in this area is still immature and needs further adjustment and optimization

Method used

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  • Highly dielectric composite material containing core-shell structured packing and preparation method thereof
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  • Highly dielectric composite material containing core-shell structured packing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put the aluminum powder into a clean vessel, passivate it in the air at room temperature for 4.5 hours, a dense, uniform and insulating alumina coating will be formed on the surface of the aluminum powder. Weigh 1g of polystyrene (PS), dissolve it in 10ml of ethyl acetate solution, then weigh 0.112g of surface-treated aluminum powder, add it to 5ml of ethyl acetate solution for 0.5 hour ultrasonic operation (using 800W Power, ultrasonic 1min, intermittent 5s mode), then mixed with polystyrene ethyl acetate solution, and stirred evenly at room temperature, poured into a film, dried at room temperature, vacuum dried, and then at a temperature of 150 ° C, Place it in an environment with a pressure of 10Mpa for 20 minutes, and finally place it in an environment with a temperature of 0°C and normal pressure for 20 minutes to form a high dielectric composite material (10.1wt% Al) containing a core@shell structure filler.

Embodiment 2

[0034] Put the aluminum powder into a clean vessel, passivate it in the air at room temperature for 4.5 hours, a dense, uniform and insulating alumina coating will be formed on the surface of the aluminum powder. Weigh 1g of polystyrene (PS), dissolve it in 10ml of ethyl acetate solution, then weigh 0.485g of surface-treated aluminum powder, add it to 5ml of ethyl acetate solution for 0.5 hour ultrasonic operation (using 800W Power, ultrasonic 1min, intermittent 5s mode), then mixed with polystyrene ethyl acetate solution, and stirred evenly at room temperature, poured into a film, dried at room temperature, vacuum dried, and then at a temperature of 150 ° C, Place it in an environment with a pressure of 10Mpa for 20 minutes to shape, and finally place it in an environment with a temperature of 0°C and normal pressure for 20 minutes to shape, and then obtain a high dielectric composite material (32.7wt% Al) containing a core@shell structure filler.

Embodiment 3

[0036] Put the aluminum powder into a clean vessel, passivate it in the air at room temperature for 4.5 hours, a dense, uniform and insulating alumina coating will be formed on the surface of the aluminum powder. Weigh 1g of polystyrene (PS), dissolve it in 10ml of ethyl acetate solution, then weigh 0.637g of surface-treated aluminum powder, add it to 5ml of ethyl acetate solution for 0.5 hour ultrasonic operation (using 800W Power, ultrasonic 1min, intermittent 5s mode), then mixed with polystyrene ethyl acetate solution, and stirred evenly at room temperature, poured into a film, dried at room temperature, vacuum dried, and then at a temperature of 150 ° C, Place it in an environment with a pressure of 10Mpa for 20 minutes to shape, and finally place it in an environment with a temperature of 0°C and normal pressure for 20 minutes to shape, and then obtain the high dielectric composite material (38.9wt% Al).

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Abstract

The invention belongs to the technology field of composite materials, more particularly relates to a high dielectric composite material containing fillers with a core-@-shell structure and a production method thereof. The composite material contains 10-45 wt% of aluminum and 55-90 wt% of polystyrene. The production method comprises the following steps: subjecting aluminum powder to surface passivation treatment to obtain fillers with a core-@-shell structure, preparing ethyl acetate solution of polystyrene, adding the treated aluminum powder into the ethyl acetate solution at different mass fractions, stirring, casting, sun-drying, oven-drying, molding and shaping to obtain the high dielectric composite material containing fillers with core-@-shell structure. An oxide coating is formed on the surface of the aluminum powder after the surface passivation treatment, so as to efficiently avoid the formation of leakage conductance due to mutual contact between eclectically-conducting additives and thereby to reduce the dielectric loss of the material. The composite material has high dielectric constant, low density and good flexibility. The production method of the composite material has the advantages of simple and controllable process, low hot-pressing temperature, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high dielectric composite material containing a core@shell structure filler and a preparation method thereof. Background technique [0002] With the development of various portable electronic devices towards miniaturization, integration and multi-function, the application of high dielectric composite materials in electronic and power engineering technology is becoming more and more extensive. At the same time, the requirements for the performance of the material and the preparation process are extremely stringent. Traditional blending and simple compounding no longer meet the requirements of the times. [0003] Although ceramic capacitors have a high dielectric constant, they need to be co-fired with electrodes at high temperatures, which is complicated in process, consumes a lot of energy, has poor flexibility, and is easy to break. [0004] Organic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08K9/02C08K3/08H01B1/22B29C70/58B29L31/34
Inventor 南策文杨程
Owner TSINGHUA UNIV
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