BNNS-coated Al2O3 heterostructure heat-conducting filler, preparation and application thereof, heat-conducting insulating composite material and preparation thereof

A technology of heterogeneous structure and thermally conductive filler, applied in the field of thermally conductive insulating materials, can solve the problems of increasing production cost and process difficulty, low thermal conductivity and high cost, etc.

Pending Publication Date: 2021-07-16
GUANGDONG SUQUN NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of thermally conductive fillers not only have little effect, but also inevitably weaken the mechanical properties of the composite material, and increase the production cost and process difficulty; moreover, commonly used thermally conductive composite materials need to add more than 60wt% thermally conductive filler, which It will significantly reduce the volume resistance of the material and reduce the insulation performance of the material
Therefore, the existing silicone rubber thermally conductive and insulating composite materials still have problems such as low thermal conductivity (~0.2 W / mK), insufficient mechanical properties and high cost, which greatly limit the further application of silicone rubber thermally conductive and insulating composite materials.

Method used

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  • BNNS-coated Al2O3 heterostructure heat-conducting filler, preparation and application thereof, heat-conducting insulating composite material and preparation thereof
  • BNNS-coated Al2O3 heterostructure heat-conducting filler, preparation and application thereof, heat-conducting insulating composite material and preparation thereof

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Experimental program
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preparation example Construction

[0022] The invention provides a method for preparing a heat-conducting filler with a heterogeneous structure, comprising the following steps:

[0023] mixing the aluminum salt, the alcohol solution, and the boron nitride nanosheets to obtain an aluminum salt-boron nitride nanosheet dispersion;

[0024] mixing the aluminum salt-boron nitride nanosheet dispersion with an ammonia solution, and precipitating to obtain an aluminum hydroxide-boron nitride nanosheet precursor;

[0025] The aluminum hydroxide-boron nitride nanosheet precursor is calcined to obtain a heterostructure thermally conductive filler.

[0026] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0027] In the invention, the aluminum salt-boron nitride nanosheet dispersion liquid is mixed with an ammonia solution for precipitation to obtain an aluminum hydroxide-boron nitride nanosheet precursor. ...

Embodiment 1

[0059] 12.6gAlCl 3 ·6H 2 O was dissolved in 500mL ethanol solution (where EtOH / H 2 O volume ratio is 19:1), stirring until AlCl 3 ·6H 2 O is completely dissolved to obtain AlCl with a concentration of 0.5 mol / L 3 solution, then add 7.5g of boron nitride nanosheets BNNS, stir at a speed of 3000rmp for 30min until uniform, and obtain AlCl 3 / BNNS dispersion; 100mL of ammonia solution with a concentration of 1.8mol / L was added to the AlCl 3 / BNNS dispersion, continue to stir for 30 minutes, and centrifuge at 4000rmp for 20 minutes to obtain a precipitate. The precipitate is sequentially cycled for ethanol washing-centrifugation twice, and then dried at 60°C for 12 hours to obtain Al(OH) 3 - BNNS precursor;

[0060] 5g of the Al(OH) 3 -BNNS precursors were calcined in a tube furnace, and were calcined at 500°C for 1 h, 700°C for 1 h, 900°C for 1 h and 1200°C for 1 h, and the heating rate was 5°C / min for each calcination temperature to obtain Heterostructure BNNS@Al 2 o 3...

Embodiment 2

[0063]12.6gAlCl 3 ·6H 2 O was dissolved in 500mL ethanol solution (where EtOH / H 2 O volume ratio is 19:1), stirring until AlCl 3 ·6H 2 O is completely dissolved to obtain AlCl with a concentration of 0.5 mol / L 3 solution, then add 2.5g of boron nitride nanosheets BNNS, stir at a speed of 3000rmp for 30min until uniform, and obtain AlCl 3 / BNNS dispersion; 100mL of ammonia solution with a concentration of 1.8mol / L was added to the AlCl 3 / BNNS dispersion, continue to stir for 30 minutes, and centrifuge at 4000rmp for 20 minutes to obtain a precipitate. The precipitate is sequentially cycled for ethanol washing-centrifugation twice, and then dried at 60°C for 12 hours to obtain Al(OH) 3 - BNNS precursor;

[0064] 5g of the Al(OH) 3 -BNNS precursors were calcined in a tube furnace, and were calcined at 500°C for 1 h, 700°C for 1 h, 900°C for 1 h and 1200°C for 1 h, and the heating rate was 5°C / min for each calcination temperature to obtain Heterostructure BNNS@Al 2 o 3 ...

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Abstract

The invention provides a BNNS-coated Al2O3 heterostructure heat-conducting filler, preparation and application thereof, a heat-conducting insulating composite material and preparation thereof, and belongs to the technical field of heat-conducting insulating materials. Aluminum salt and boron nitride nanosheets are taken as raw materials, Al2O3 grows on the surface of BNNS in situ through a precipitation-high-temperature calcination method, the BNNS-coated Al2O3 heat conduction filler with a point-surface heterostructure is prepared, and compared with a single boron nitride nanosheet layer and Al2O3 particles, the heat-conducting filler BNNS-coated Al2O3 with a point-surface heterostructure can increase the contact lap joint probability of the heat-conducting filler in a silicone rubber matrix, more efficient heat-conducting passages or networks are formed, the construction efficiency of the heat-conducting passages of the heat-conducting filler in the matrix is improved, the heat-conducting property of the heat-conducting composite material is further improved, the composite material with high heat-conducting property can be obtained when the use amount of the heat-conducting filler is low, and the mechanical property of the heat-conducting composite material is ensured.

Description

technical field [0001] The invention relates to the technical field of thermally conductive insulating materials, in particular to a BNNS@Al 2 o 3 Heterostructure thermally conductive fillers and their preparation and application, thermally conductive and insulating composite materials and their preparation. Background technique [0002] Silicone rubber has high flexibility, excellent high and low temperature resistance, corrosion resistance and outstanding electrical insulation performance, which can play the role of sealing, insulation and shock absorption, and is widely used in the preparation of thermal interface materials and other thermal insulation composite materials. At present, the market demand for thermally conductive and insulating silicone rubber in the industry is expanding day by day, and the preparation of traditional thermally conductive composite materials is mainly based on simply filling thermally conductive fillers. However, a large amount of thermall...

Claims

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Application Information

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IPC IPC(8): C08K3/22C08K3/38C08L83/04
CPCC08K3/22C08K3/38C08K2201/011C08K2003/385C08L83/04
Inventor 任泽明顾军渭严含阮坤鹏王号
Owner GUANGDONG SUQUN NEW MATERIAL CO LTD
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