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Thermally conductive and insulating composite material and its preparation method and application

A technology of heat conduction insulation and composite materials, applied in the field of composite materials, can solve the problems of large interface thermal resistance, phonon scattering, sacrifice material mechanical properties, etc., and achieve the effects of efficient heat transfer, high thermal conductivity, and reduced contact thermal resistance

Active Publication Date: 2022-03-18
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thermally conductive insulating fillers include, such as metal oxides (Al 2 o 3 , MgO) or metal nitrides (AlN, BN), etc., when they are directly added to the resin system, a high filling amount is required to achieve high thermal conductivity, but at the same time, the mechanical properties of the material itself are sacrificed
In the resin composite system, the long molecular chains of the resin matrix cover the surrounding of the thermally conductive filler, which cannot form a continuous thermally conductive path, blocks the phonon propagation path, and produces a large interface thermal resistance, resulting in phonon scattering. Covalent modification, non-covalent modification, multi-component hybridization and other methods are usually used to solve the problem of interfacial thermal resistance. However, although these methods improve the interfacial bonding force between filler and resin and the dispersion in resin, they do not affect the stability of the entire composite system. Thermal conductivity improvement is not obvious, resulting in thermal conductivity is still not ideal

Method used

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  • Thermally conductive and insulating composite material and its preparation method and application

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preparation example Construction

[0037] In another aspect of the present invention, a method for preparing the thermally conductive and insulating composite material is provided, which includes the following steps:

[0038] S10, providing wood sponge and boron nitride nanosheets;

[0039] S20, dissolving the boron nitride nanosheets in water to form a boron nitride solution, and immersing the wood sponge in the boron nitride solution for loading to obtain a boron nitride-wood sponge hybrid filler;

[0040] S30, mixing the resin matrix with the boron nitride-wood sponge hybrid filler, and curing to obtain a thermally conductive and insulating composite material.

[0041] In some embodiments, the preparation method of the wood sponge comprises:

[0042] S12, cutting and chemically treating the natural wood according to the growth method, wherein the chemical treatment includes a step of selectively removing lignin and hemicellulose components in the cell wall of the natural wood and a step of freeze-drying;

[...

Embodiment 1

[0059] 1. Preparation of wood sponge

[0060] (1) Cut the balsa wood into 2cm*2cm*2cm blocks along the growth direction, immerse the blocks in acetic acid-sodium acetate buffer solution containing 5 wt% sodium hypochlorite, pH 4.6, and heat to 100°C for reaction 6h for delignification treatment.

[0061] (2) Immerse the delignified wood in a solution containing 8wt% NaOH, and react at 80°C for 8 h to remove hemicellulose in the wood.

[0062] (3) Soak the wood after lignin and hemicellulose has been removed with ethanol-water solution repeatedly to remove the remaining chemical substances inside, then freeze the wood at -20°C for 10 hours, and then freeze it at -56°C Dry for 40 hours to get wood sponge.

[0063] 2. Preparation of boron nitride nanosheets

[0064] Mix 3g of hexagonal boron nitride with 325 meshes and 90g of urea, and use a planetary ball mill to mill at a speed of 300rpm for 24 hours. The powder obtained by ball milling is dissolved in water, subjected to su...

Embodiment 2

[0072] 1. Preparation of wood sponge

[0073] (1) Cut the balsa wood into 2cm*2cm*2cm blocks along the growth direction, immerse the blocks in acetic acid-sodium acetate buffer solution containing 5 wt% sodium hypochlorite, pH 4.6, and heat to 100°C for reaction 6h for delignification treatment.

[0074] (2) Immerse the delignified wood in a solution containing 8wt% NaOH, and react at 80°C for 8 h to remove hemicellulose in the wood.

[0075] (3) Soak the wood after lignin and hemicellulose has been removed with ethanol-water solution repeatedly to remove the remaining chemical substances inside, then freeze the wood at -20°C for 10 hours, and then freeze it at -56°C Dry for 40 hours to get wood sponge.

[0076] 2. Preparation of boron nitride nanosheets

[0077] Mix 3g of hexagonal boron nitride with 325 meshes and 90g of urea, and use a planetary ball mill to mill at a speed of 300rpm for 24 hours. The powder obtained by ball milling is dissolved in water, subjected to su...

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Abstract

The invention relates to the technical field of composite materials, in particular to a heat-conducting and insulating composite material and a preparation method and application thereof. The thermally conductive and insulating composite material includes a resin matrix and a thermally conductive filler, the resin matrix is ​​a thermosetting resin, the thermally conductive filler is a boron nitride-wood sponge hybrid filler, and the boron nitride-wood sponge hybrid filler is made of wood The sponge is composed of boron nitride nanosheets, which have a three-dimensional interconnected network structure in alignment.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a heat-conducting and insulating composite material and a preparation method and application thereof. Background technique [0002] In the modern electronics industry, thermal management materials are widely used in light-emitting diodes, energy storage conversion systems, military weapons, and aerospace fields. With the improvement of the power density of electronic equipment and electrical systems and the development of miniaturization and light weight, in order to ensure the safety of equipment use, prolong the service life, and meet the high-efficiency operation of equipment, new thermal management materials must have high heat dissipation performance, electrical insulation, and mechanical properties. Traditional thermal conductive materials cannot meet these needs. Resin materials have the advantages of electrical insulation, easy processing, light weight and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/02C08K9/12C08K3/38C09K5/14
CPCC08K9/12C08K3/38C09K5/14C08K2003/385C08K2201/011C08K2201/005C08L63/00
Inventor 李岳郭建强梁佳丰罗圭纳李炯利王刚王旭东
Owner 北京石墨烯技术研究院有限公司
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