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Nanometer carbon-coated boron nitride composite powder and its preparation method and use

A composite powder and boron nitride technology, which is applied in nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem that the infrared radiation characteristics of nano-carbon materials cannot be well utilized, and various heat dissipation modes cannot be fully utilized. Infrared radiation rate Low-level problems, achieve good thermal conductivity, maintain thermal conductivity, and high infrared radiation rate

Active Publication Date: 2015-07-29
江苏联科纳米科技有限公司
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AI Technical Summary

Problems solved by technology

However, its infrared radiation rate is too low, and it cannot give full play to the role of multiple heat dissipation modes.
[0005] At present, nano-carbon materials and boron nitride in composite materials are only added as separate fillers separately or mixed together. For example, CN100590069A discloses a method for preparing boron nitride-coated carbon nanotubes or nanowires and boron nitride nanotubes. Metal borohydride and fluoroborate are used as boron source, ammonium salt is used as nitrogen source, and boron nitride-carbon nanotube composite material is obtained by means of in-situ wrapping process, but the composite material is wrapped with nano-carbon material inside the material , so that the infrared radiation characteristics of carbon nanomaterials cannot be well exerted

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  • Nanometer carbon-coated boron nitride composite powder and its preparation method and use
  • Nanometer carbon-coated boron nitride composite powder and its preparation method and use

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preparation example Construction

[0040] In a typical implementation case, the preparation method may include the following steps:

[0041](1) Functionalization of nano-carbon materials: reflux nano-carbon materials in 2-8 M concentrated nitric acid solution at 100-140°C for 1-24 h, filter and wash until neutral to prepare carboxylated nano-carbon materials, collect Standby; Wherein, nano-carbon material can adopt various types of carbon nanotubes and graphene materials of various forms, for example, graphene, graphene microplate etc., and graphene material also can directly select graphene oxide for use;

[0042] (2) Disperse the boron nitride powder in an anhydrous solvent, add an amino coupling agent accounting for 1-30% of the weight of the boron nitride powder, mix and stir for 1-24h, then stir at 70-100°C for 30min-1h , collected by filtration and prepared to obtain amino-functionalized boron nitride powder;

[0043] (3) Disperse the carboxylated nano-carbon material in water, gradually add amino-functi...

Embodiment 1

[0049] 1 g of multi-walled carbon nanotubes (diameter 20 nm, length 15 μm) was refluxed at 120 °C for 6 h in a 6 M nitric acid solution, filtered and washed until neutral to obtain carboxylated multi-walled carbon nanotubes, and then ultrasonically dispersed in Reserve in water. At the same time, 10 g of boron nitride powder (hexagonal boron nitride, average particle size 15 μm) was dispersed in absolute ethanol with high-speed stirring, and 2 g of KH550 coupling agent was added dropwise during the stirring process, stirred for 6 hours, and then Heat up to 70°C and reflux for 30 minutes, filter and wash excess coupling agent to obtain amino-functionalized boron nitride. Next, disperse the amino-functionalized boron nitride in water, add carboxylated multi-walled carbon nanotube dispersion liquid during the stirring process, mix and stir for 1 hour, filter and wash, and vacuum-dry at 60°C for 4 hours to obtain multi-walled carbon nanotube-wrapped boron nitride Composite powder...

Embodiment 2

[0051] 1 g single-walled carbon nanotubes (diameter 20 nm, length 15 μm) were refluxed at 120 °C for 6 h in a 6 M nitric acid solution, filtered and washed until neutral to obtain carboxylated single-walled carbon nanotubes, and then ultrasonically dispersed in Reserve in water. At the same time, 10 g of boron nitride powder (average particle size 15 μm) was dispersed in absolute ethanol with high-speed stirring, 2 g of KH550 coupling agent was added dropwise during stirring, stirred for 6 hours, and then heated to 70°C for 30 minutes under reflux. Filter and wash excess coupling agent to obtain amino-functionalized boron nitride. Next, disperse the amino-functionalized boron nitride in water, add carboxylated single-wall carbon nanotube dispersion liquid during the stirring process, mix and stir for 1 hour, filter and wash, and vacuum-dry at 60°C for 4 hours to obtain single-wall carbon nanotube-wrapped boron nitride Composite powder.

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Abstract

The invention discloses nanometer carbon-coated boron nitride composite powder and its preparation method and use. The nanometer carbon-coated boron nitride composite powder comprises a nanometer carbon material and boron nitride. The nanometer carbon material is uniformly adsorbed and coats boron nitride surface so that a composite coated structure is formed. The preparation method comprises carrying out surface functionalization on the boron nitride powder by an amino coupling agent, carrying out oxidative carboxylation treatment on the nanometer carbon material, and carrying out electrostatic adsorption on the nanometer carbon material on the surface of boron nitride so that a desired product is obtained. The nanometer carbon-coated boron nitride composite powder utilizes boron nitride as a nanometer carbon material carrier, is conducive to nanometer carbon material addition and dispersion, has a high efficiency heat-conduction electric-conduction network, has excellent heat conduction performances of the nanometer carbon material and boron nitride and electric conduction and infrared radiation characteristics of the nanometer carbon material, and has an important application value in the field of composite materials and functional paint. The preparation method has a simple process route, is suitable for large-scale production and has an important industrialization prospect.

Description

technical field [0001] The invention relates to a micro-nano wrapped powder and a preparation method thereof, in particular to a nano-carbon-wrapped boron nitride composite powder, a preparation method and an application thereof. Background technique [0002] With the rapid development of the national economy, the demand for high-efficiency heat dissipation technology has expanded rapidly, making traditional materials under great pressure to improve performance. The existing heat dissipation methods mainly include heat conduction, convection and radiation heat dissipation, but heat conduction is still the main method at present, but when forced convection heat dissipation cannot be adopted due to factors such as size, space and cost, it is increasingly impossible to use only heat conduction. Meet the needs. Especially with the trend of large-scale and miniaturized electronic devices, it is particularly urgent to explore new heat dissipation technologies. The combination of ...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/04C01B21/064
Inventor 陈名海董其宝李清文徐坤元
Owner 江苏联科纳米科技有限公司
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