Method for preparing carbon coated hexagonal boron nitride

A technology of hexagonal boron nitride and carbon coating, applied in the preparation/purification of carbon, chemical instruments and methods, nitrogen compounds, etc., can solve the problems of easy agglomeration, large specific surface energy of BN nanoparticles, etc. , low price, easy availability of raw materials

Inactive Publication Date: 2012-06-20
镇江中孚复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BN nanoparticles obtained by the preparation methods of these functional materials have large specific surface energy and are easy to agglomerate. Due to their relative inertness, it is difficult to solve them by conventional chemical techniques. How to prepare a large amount of BN nanoparticles with controllable structure, high purity, Boron nitride nanomaterials with good crystallinity is a major problem at present. Research on this problem not only contributes to the development of nanomaterial growth mechanism, but also serves as the basis and guarantee for further application development.
On the other hand, after obtaining high-quality boron nitride nanomaterials, how to improve the application performance of the materials by means of modification or doping is also a very challenging problem.

Method used

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  • Method for preparing carbon coated hexagonal boron nitride
  • Method for preparing carbon coated hexagonal boron nitride
  • Method for preparing carbon coated hexagonal boron nitride

Examples

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Effect test

Embodiment 1

[0017] Take boric acid and urea at a molar ratio of 2:3, mix them evenly and put them into the ark, place them in a tube furnace and raise the temperature to 800°C for 1 hour at a rate of 5°C / min to obtain hexagonal boron nitride. Carry out x-ray diffraction analysis to product, the result is as follows figure 1 shown. The obtained hexagonal boron nitride was placed in the maleic anhydride ethylene octene graft copolymer dissolved in tetrahydrofuran, stirred evenly, extracted with absolute ethanol, filtered with suction, and dried in an oven at 60°C for 5 hours. Transfer the above dried product into a stainless steel reaction kettle, seal it and place it in a tube furnace, raise the temperature to 600°C at a rate of 5 / min, keep it warm for 1 hour, and then cool it naturally to obtain carbon-coated hexagonal boron nitride. X-ray diffraction analysis was carried out on it, and the results were as follows figure 2 As shown, it can be seen from the figure that carbon-coated hex...

Embodiment 2

[0019] Take boric acid and urea at a molar ratio of 2:3, mix them evenly and put them into the ark, place them in a tube furnace and raise the temperature to 850°C for 1 hour at a rate of 10°C / min to obtain hexagonal boron nitride. The obtained hexagonal boron nitride was placed in the maleic anhydride ethylene octene graft copolymer dissolved in tetrahydrofuran, stirred evenly, extracted with absolute ethanol, filtered with suction, and dried in an oven at 70°C for 4.5 hours. Transfer the above dried product into a stainless steel reaction kettle, seal it and place it in a tube furnace, raise the temperature to 600°C at a rate of 5°C / min, keep it warm for 1 hour, and then cool it down naturally to obtain carbon-coated hexagonal boron nitride.

Embodiment 3

[0021] Take boric acid and urea at a molar ratio of 2:3, mix them evenly and put them into the ark, place them in a tube furnace and raise the temperature to 800°C for 1 hour at a rate of 10°C / min to obtain hexagonal boron nitride. The obtained hexagonal boron nitride was placed in the maleic anhydride ethylene octene graft copolymer dissolved in tetrahydrofuran, stirred evenly, extracted with absolute ethanol, filtered with suction, and dried in an oven at 80°C for 5 hours. Transfer the above dried product into a stainless steel reaction kettle, seal it and place it in a tube furnace, raise the temperature to 600°C at a rate of 5°C / min, keep it warm for 1 hour, and then cool it down naturally to obtain carbon-coated hexagonal boron nitride.

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Abstract

The invention discloses a method for preparing carbon coated hexagonal boron nitride. The method is characterized in that boric acid and urea are used as raw materials to prepare hexagonal boron nitride, maleic anhydride ethylene octylene graft copolymers are used as a carbon source, the carbon coated hexagonal boron nitride with a core-shell structure is obtained by the aid of steps of stirring,extracting, leaching, drying and carbonizing at high temperature, wherein, a core is the hexagonal boron nitride, and carbon is a shell. When the method is used for preparing carbon coated hexagonal boron nitride, the raw materials are available easily, prices of the raw materials are cheap, inclusive compound of the hexagonal boron nitride has the core-shell structure, the hexagonal boron nitride is the core, the carbon is the shell, sizes of products are uniform, specific surface areas are large, and the products have excellent dispersibility when added to base oil or high-polymer resin, and still have an excellent mechanical performance and excellent abrasion resistance when in extreme environments with high temperature and high pressure.

Description

technical field [0001] The invention relates to a method for preparing lubricating materials, in particular to a method for preparing carbon-coated hexagonal boron nitride. Background technique [0002] Hexagonal boron nitride is an important III-V compound, which belongs to the hexagonal crystal system and has a layered structure similar to graphite, known as white graphite. Its lattice constant is a=0.2504nm, c=6652nm, with P63 / mmc space symmetry. Each layer of hexagonal boron nitride has B atoms and N atoms arranged alternately to form a planar hexagonal ring structure, and the atoms in each layer along the C axis are arranged in the ABAB... way, and the B atoms and N atoms in the layer are arranged by SP 2 The hybrid covalent bonds are bonded together, and the layers are bonded by van der Waals force, so the structure of each layer of hexagonal boron nitride is stable, but the layers are easy to peel off. Hexagonal boron nitride has stable chemical properties and is ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064C01B31/02C10M125/26C10N30/06C01B32/05
Inventor 李长生霍生伟唐华
Owner 镇江中孚复合材料有限公司
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