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Thermally conductive and electrically insulating compositions comprising core-shell fillers

A technology of electrical insulation and thermoplastic polymers, applied in the field of thermally conductive and electrically insulating compositions containing core-shell fillers, which can solve the problems of reduced mechanical properties, high cost, and complicated preparation processes

Inactive Publication Date: 2017-12-29
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the alkalinity of the metal oxide itself, an excessively high addition amount is likely to cause degradation of the polymer, resulting in problems such as decreased mechanical properties and processing difficulties.
Adding high-purity ceramic materials such as silicon carbide or boron nitride can significantly improve the thermal conductivity of thermoplastic polymers, but the preparation process of such ceramic materials is very complicated, resulting in high cost

Method used

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  • Thermally conductive and electrically insulating compositions comprising core-shell fillers
  • Thermally conductive and electrically insulating compositions comprising core-shell fillers
  • Thermally conductive and electrically insulating compositions comprising core-shell fillers

Examples

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preparation example Construction

[0071] Boron nitride can be amorphous or crystalline according to different preparation methods. The common and most stable boron nitride crystal form is hexagonal, which has a sheet structure similar to graphite (graphite), and its hardness is equivalent to that of graphite, which can be represented by "h-BN" or "g-BN". Another common crystal form of boron nitride is cubic (cubic), which has a structure similar to diamond, and its hardness is lower than that of diamond, but higher than that of hexagonal boron nitride, which can be expressed as "c-BN".

[0072] According to the present invention, the boron nitride is preferably hexagonal boron nitride, cubic boron nitride or a mixture thereof.

[0073] In one embodiment of the present invention, in the core-shell filler, the boron nitride is hexagonal boron nitride.

[0074] The boron nitride used in the present invention is generally flake boron nitride or boron nitride agglomerates, and its average particle size is from abo...

Embodiment

[0089] The abbreviation "E" means "Example", "CE" means "Comparative Example", and the number following it indicates in which Example or Comparative Example the composition was prepared. All examples and comparative examples were prepared and tested in a similar manner. Percentages are by weight unless otherwise indicated.

[0090] Table 2 lists the components used in Examples and Comparative Examples.

[0091] Table 2

[0092]

[0093] The preparation method of the core-shell type filler that embodiment E1-E15 and comparative example CE7 use

[0094] Using the Nobiltia mechanofusion system (NOB-Mini, Hosokawa Micron Corporation, Osaka, Japan), a cladding layer as shell material (eg boron nitride) is formed on the surface of the core material (eg aluminum or copper). Before mechanical fusion treatment, pre-mix the core material and shell material according to the ratio listed in Table 3-4, and then pour the mixed powder into the processing cavity of the mechanical fusi...

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Abstract

The present invention relates to thermally conductive and electrically insulating compositions comprising core-shell fillers. More specifically, the present invention discloses thermally conductive and electrically insulating compositions comprising (i) from about 30% to about 70% by weight of a thermoplastic polymer, and (ii) from about 30% to about 70% by weight The core-shell filler, wherein, the weight % is based on the total weight of the composition. The core-shell filler comprises: (a) about 70% to about 97% by volume of metal particles selected from the group consisting of aluminum, copper, gold and silver, and (b) about 3% to about 30% by volume of selected from boron nitride, wherein the volume % is based on the total volume of the core-shell type filler, and the boron nitride is used as a shell, coated on the surface of the metal particle as the core, and A filler with a core-shell structure is formed.

Description

technical field [0001] The invention relates to thermally conductive and electrically insulating compositions and moldings obtained from said compositions. Background technique [0002] As an engineering polymer with excellent performance, thermoplastic polymers have outstanding dimensional stability, solvent resistance, high temperature resistance, impact resistance and excellent electrical insulation, so they are widely used in electrical equipment, electronic equipment, and energy storage equipment , packaging and construction. In view of the high integration of microelectronics and the miniaturization of devices, the requirements for the thermal conductivity of the components and housings of laptop computers, TV sets, LED lights, instrument panels, etc. made of thermoplastic polymers are gradually increasing. For example, in order to prevent the entry of water vapor and dust, most of the electronic components are densely packed in a closed space, so that the ventilation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/00C08L69/00C08L67/00C08K3/08C08K3/38
CPCC08K9/10C08L69/00C08L77/00
Inventor 戴炜枫唐甜相飞
Owner EI DU PONT DE NEMOURS & CO