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Preparation method of boron nitride/carbon nanotube/polyimide composite material

A carbon nanotube and composite material technology is applied in the field of preparation of boron nitride/carbon nanotube/polyimide composite materials, which can solve the problems of poor thermal conductivity and increased electrical conductivity.

Inactive Publication Date: 2021-11-05
大同共聚西安科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the poor thermal conductivity of existing polyimides, and the addition of conductive fillers or graphene and other fillers will lead to an increase in its electrical conductivity, and to provide a boron nitride / carbon nanotube / polyimide The preparation method of the amine composite material, by simultaneously adding modified boron nitride and carboxyl carbon nanotubes to form a boron nitride / carbon nanotube composite filler, realizes the purpose of improving the thermal conductivity of polyimide, and broadens the use of polyimide in The application range in the field of heat conduction is of great significance to the scientific research and application of polyimide heat conduction materials

Method used

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  • Preparation method of boron nitride/carbon nanotube/polyimide composite material

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Experimental program
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Effect test

Embodiment 1

[0017] (1) Disperse commercially available micron boron nitride in 5mol / L sodium hydroxide solution to make a 4g / L dispersion, place it in an ultrasonic bath with an oscillation frequency of 26kHz and an output power of 500W for 2h, then Transfer the dispersion to a hydrothermal kettle and react at 150°C for 6h. After the reaction is complete, cool the room temperature naturally, wash the product with deionized water until it is neutral, and dry it in a vacuum oven at 60°C for 8h to obtain boron nitride nanoparticles. piece;

[0018] (2) Add the silane coupling agent KH550 into 95% ethanol aqueous solution to form a 0.5wt% solution, then add the boron nitride nanosheets obtained in step (1), stir and react at 60°C for 8h, and spin the solvent to obtain silane Coupling agent modified boron nitride, wherein the mass ratio of silane coupling agent to boron nitride is 1:10;

[0019] (3) Add 1 g of commercially available carbon nanotubes to a mixture of 30 mL of concentrated hydro...

Embodiment 2

[0024] (1) consistent with embodiment 1 step (1);

[0025] (2) Add the silane coupling agent KH550 into 95% ethanol aqueous solution to form a 0.5wt% solution, then add the boron nitride nanosheets obtained in step (1), stir and react at 60°C for 8h, and spin the solvent to obtain silane Coupling agent modified boron nitride, wherein the mass ratio of silane coupling agent to boron nitride is 1:20;

[0026] (3) consistent with embodiment 1 step (3);

[0027] (4) consistent with embodiment 1 step (4);

[0028] (5) consistent with embodiment 1 step (5);

[0029] (6) Consistent with embodiment 1 step (6), the thermal conductivity of the composite material reaches 0.7W / mK, and the resistance is 1.5×10 11 Ωm.

Embodiment 3

[0031] (1) consistent with embodiment 1 step (1);

[0032] (2) consistent with embodiment 1 step (2);

[0033] (3) consistent with embodiment 1 step (3);

[0034] (4) Add 0.1g of carboxyl carbon nanotubes and 1g of modified boron nitride to 100g of N,N-dimethylacetamide, at room temperature, in an ultrasonic bath with an oscillation frequency of 26kHz and an output power of 500W Ultrasound for 2 hours to obtain boron nitride / carbon nanotube filler;

[0035] (5) consistent with embodiment 1 step (5);

[0036] (6) Consistent with embodiment 1 step (6), the thermal conductivity of the composite material reaches 0.7W / mK, and the resistance is 1.8×10 11 Ωm.

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Abstract

The invention relates to a preparation method of a boron nitride / carbon nanotube / polyimide composite material. The preparation method of the composite material comprises the following steps: firstly, preparing micron boron nitride into boron nitride nanosheets through a hydrothermal method, and then modifying the boron nitride nanosheets through a silane coupling agent KH550; acidizing a carbon nanotube to obtain a carboxyl carbon nanotube, compounding the modified boron nitride and the carboxyl carbon nanotube in a solvent, and adding a tetracarboxylic dianhydride monomer of diamine into a system to prepare polyamide acid, and finally, drying the polyamide acid solution added with the boron nitride / carbon nanotube composite filler, and performing high-temperature dehydration imidization to obtain the boron nitride / carbon nanotube / polyimide composite material. The microstructure of the filler particles is regulated and controlled by regulating and controlling the proportion of the boron nitride and the carbon nanotubes at the same time, so that the heat-conducting property of the composite material is regulated and controlled, the heat conductivity of the prepared composite material is larger than 0.6 W / mK, and the resistivity is larger than 1 * 10 < 11 > omegam.

Description

technical field [0001] The invention relates to a method for preparing a boron nitride / carbon nanotube / polyimide composite material, which belongs to the field of heat-conducting composite materials. The thermally conductive and insulating compound prepared by the invention can be used as a thermally conductive material in the fields of electronic devices, electronic packaging, integrated circuits and the like. Background technique [0002] Polyimide (Polyimide, PI for short) refers to a class of high-performance engineering plastics containing imide rings (-CO-N-CO-) in the main chain. The reason why polyimide can be widely used in the fields of aerospace, microelectronics and lithium-ion battery separation membranes is mainly due to the high temperature resistance of polyimide can reach above 400°C, and it can be used at -200°C-300°C It has an extremely long service life in a wide temperature range. It is precisely because of the above advantages that polyimide is known a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K9/06C08K9/02C08K3/38C08K3/04
CPCC08K9/06C08K9/02C08K3/38C08K3/041C08K2003/385C08K2201/011C08K2201/016C08L79/08
Inventor 周雨薇
Owner 大同共聚西安科技有限公司
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