Aluminum particle/PVDF polymer dielectric medium and preparation method thereof

A technology of aluminum particles and polymers, applied in the field of aluminum particles/PVDF polymer dielectric and its preparation, can solve the problems of no obvious increase in thermal conductivity, loss of electrical breakdown strength, sudden change in dielectric properties, etc., and achieve processing performance Good, improved thermal breakdown voltage, stable dielectric properties

Active Publication Date: 2014-12-24
XIANYANG TIANHUA ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the metal-filled polymer dielectric is near the percolation value of the conductive particles, the dielectric constant rises rapidly, the dielectric loss rises sharply, and the dielectric properties show a sudden change. A slight change in the amount of filler will cause a significant change in the loss, but at this time The thermal conductivity of the filler does not increase significantly; if the percolation value of the filler is exceeded, the electrical conductivity of the system will rise sharply, and the electrical breakdown strength will be lost.
It can be seen that relying solely on metals as fillers cannot make polymers obtain stable properties such as high dielectric constant, low loss and good thermal conductivity.

Method used

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  • Aluminum particle/PVDF polymer dielectric medium and preparation method thereof
  • Aluminum particle/PVDF polymer dielectric medium and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] see figure 2 , The preparation method of the present invention has the following three steps, which are divided into three parts: preparation of aluminum particles with a composite structure, surface modification, and compounding with PVDF resin.

[0037] (1) Preparation of aluminum particles with composite structure:

[0038] Take 50g of aluminum particles and put them into several porcelain boats, put the porcelain boats into a high-temperature heating furnace, continuously feed high-purity nitrogen, and remove the air for 30 minutes. After the air is removed, turn on the heating device and raise the temperature to 500°C under a nitrogen atmosphere. , lasted 0.2h. Turn off the heating switch, cool down to room temperature under a nitrogen atmosphere, take out the sample, and set aside.

[0039] (2) Surface modification of aluminum particles with composite structure:

[0040] Weigh 20g of composite structure aluminum particles and put them into a 200mL three-necked...

Embodiment 2

[0046] see figure 2 , a method for preparing an aluminum particle / PVD polymer electrolyte, comprising the following steps:

[0047] 1) Preparation of aluminum particles with composite structure:

[0048] Aluminum particles with a particle size of 70-80nm are heated at 520°C in a nitrogen atmosphere for 0.3h and cooled down to room temperature in a nitrogen atmosphere to obtain aluminum particles with a composite structure;

[0049] 2) Surface modification of aluminum particles with composite structure:

[0050] Mix the aluminum particles with composite structure and xylene and obtain a reaction solution after ultrasonication for 5 minutes, add KH-560 silane coupling agent which accounts for 4% of the mass of aluminum particles with composite structure dropwise to the reaction solution, and reflux at 83°C for 9.5 hours , then reflux at 125°C for 2.5h, then filter and dry at 110°C for 6h to obtain modified composite structure aluminum particles; wherein, the ratio of composit...

Embodiment 3

[0055] 1) Preparation of aluminum particles with composite structure:

[0056] Aluminum particles with a particle size of 70-80nm are heated at 580°C in a nitrogen atmosphere for 0.3h and cooled down to room temperature in a nitrogen atmosphere to obtain aluminum particles with a composite structure;

[0057] 2) Surface modification of aluminum particles with composite structure:

[0058] Mix the aluminum particles with composite structure and xylene and obtain a reaction solution after ultrasonication for 7 minutes, add KH-560 silane coupling agent which accounts for 3.5% of the mass of aluminum particles with composite structure dropwise to the reaction solution, and reflux at 87°C for 9 hours. Then reflux at 120°C for 3 hours, then filter and dry at 114°C for 5.5 hours to obtain modified aluminum particles with composite structure; wherein, the ratio of aluminum particles with composite structure to xylene is 20g:75mL;

[0059] Ultrasonic dispersion of modified aluminum pa...

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Abstract

The invention relates to an aluminum particle / PVDF polymer dielectric medium and a preparation method thereof. The method comprises the following steps: carrying out surface modification treatment for composite-structure aluminum nanoparticles (that is, aluminum nitride is used as a shell, and metallic aluminum is used as a core) of which the surfaces are subjected to direct nitriding treatment, mixing with PVDF, and then carrying out ultrasonic treatment, dispersion, drying and hot-pressing to prepare the aluminum particle / PVDF polymer dielectric medium. The prepared polymer dielectric medium material has high heat conductivity, high dielectric constant and low loss. When the prepared polymer dielectric medium material is used as a thin film capacitor, the thermal breakdown voltage is improved, and the service life is prolonged. The preparation process is relatively simple, and the processing performance is good. The highest heat conductivity of the polymer dielectric medium is 1.92W / mK, the dielectric constant is about 60 under low frequency of 50Hz, and the loss is lower than 0.25. Compared with the same kind of aluminum particle / polymer system without nitriding treatment for the surface and surface modification treatment, the thermal breakdown voltage of the polymer dielectric medium is higher than about 1.5-2.0kV / mm, and the polymer dielectric medium is suitable for being used on occasions with higher voltage.

Description

technical field [0001] The invention belongs to the cross field of electrical materials and chemical industry, and relates to the cross research field between high dielectric constant and low dielectric loss polymer dielectric and thermally conductive and insulating polymer dielectric, and specifically relates to an aluminum particle / PVDF polymer dielectric and its preparation method. Background technique [0002] The low-cost, easy-to-process, light-weight, and high-permittivity polymer dielectric with good mechanical properties combines many properties of traditional dielectric materials with the characteristics of excellent toughness, low cost, and easy processing of polymers. It can be used in the field of microelectronics as a High-capacity embedded microcapacitors are used in printed circuit boards to ensure high-speed and safe operation of integrated circuits; in the field of electrical engineering, they can be used as dielectric materials for high energy storage dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/10C08K9/06C08K3/08C08J5/18B32B27/06B32B27/18B32B27/30
Inventor 闫智伟
Owner XIANYANG TIANHUA ELECTRONICS SCI & TECH
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