Boron nitride hollow tube with tube wall formed by directional coverage of lamellas and preparation method of boron nitride hollow tube

A boron nitride, hollow tube technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of unsuitable mass production, low output, small surface area, etc., achieve good application prospects, and improve specific surface area. Effect

Active Publication Date: 2022-05-27
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a low yield and is not suitable for mass production.
Liu Bingsai et al. used boric acid and magnesium chloride as reaction raw materials, sodium chloride or potassium chloride as co-solvent, mixed in a certain proportion, annealed at 800-1000°C to form a boron-containing precursor, and then introduced ammonia gas to protect the Annealing at about 1100°C to collect a one-dimensional hierarchical thin-walled BN microtube with an internal diameter of 0.4-2um, a tube length of 5-60um, and a tube wall thickness of 30-100nm. Boron nitride nanosheets are loaded on the surface of the tube. The flakes are interwoven to form boron nitride sheets, and the thickness of the boron nitride sheets is 40-80nm. The boron nitride hierarchical structure obtained by this preparation method has important and broad application prospects in the strengthening and toughening of ceramics and the improvement of thermal conductivity of polymers. However, the structure The nano flakes are small and irregular in shape, and the BN sheets are randomly interwoven without orientation, and its surface area is small, and its adsorption performance is weak

Method used

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  • Boron nitride hollow tube with tube wall formed by directional coverage of lamellas and preparation method of boron nitride hollow tube
  • Boron nitride hollow tube with tube wall formed by directional coverage of lamellas and preparation method of boron nitride hollow tube
  • Boron nitride hollow tube with tube wall formed by directional coverage of lamellas and preparation method of boron nitride hollow tube

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Effect test

Embodiment 1

[0040] A method for preparing a boron nitride hollow tube with lamella directionally covering and forming a tube wall, comprising the following steps:

[0041] (1) Under magnetic stirring at room temperature, the H 3 BO 3 and Mg(NO 3 ) 2 Mix and dissolve in deionized water so that the concentrations are 3 mol / L and 2 mol / L respectively, and then dropwise add ammonia water with a concentration of 25% to pH 10 to obtain a precursor solution. After that, take 80ml of the precursor solution and put it into a 100ml polytetrafluoroethylene-lined hydrothermal reactor, heat it to 200°C, keep it under isothermal conditions for 20h, then naturally cool to room temperature, filter the product, use Washed with ionized water three times, and vacuum-dried at 110 °C for 12 h to obtain a boron-containing precursor;

[0042] (2) Take the boron-containing precursor prepared above, put it into a tubular furnace, and pass into ammonia gas after vacuuming, and the ammonia gas flow rate is 100m...

Embodiment 2

[0050] A method for preparing a boron nitride hollow tube with lamella directionally covering and forming a tube wall, comprising the following steps:

[0051] (1) Under magnetic stirring at room temperature, the H 3 BO 3 and Mg(NO 3 ) 2 Mix and dissolve in deionized water so that the concentrations are 3 mol / L and 2 mol / L respectively, and then dropwise add ammonia water with a concentration of 25% to pH 10 to obtain a precursor solution. After that, take 80ml of the precursor solution and put it into a 100ml polytetrafluoroethylene-lined hydrothermal reactor, heat it to 200°C, keep it under isothermal conditions for 20h, then naturally cool to room temperature, filter the product, use Washed with ionized water three times, and vacuum-dried at 110 °C for 12 h to obtain a boron-containing precursor;

[0052] (2) Take the boron-containing precursor prepared above, put it into a tube furnace, and pass into ammonia gas after vacuuming, and the ammonia gas flow rate is 150ml / m...

Embodiment 3

[0055] A method for preparing a boron nitride hollow tube with lamella directionally covering and forming a tube wall, comprising the following steps:

[0056] (1) Under magnetic stirring at room temperature, the H 3 BO 3 and Mg(NO 3 ) 2 Mix and dissolve in deionized water so that the concentrations are 3 mol / L and 2 mol / L respectively, and then dropwise add ammonia water with a concentration of 25% to pH 10 to obtain a precursor solution. After that, take 80ml of the precursor solution and put it into a 100ml polytetrafluoroethylene-lined hydrothermal reactor, heat it to 200°C, keep it under isothermal conditions for 20h, then naturally cool to room temperature, filter the product, use Washed with ionized water three times, and vacuum-dried at 110 °C for 12 h to obtain a boron-containing precursor;

[0057] (2) Take the boron-containing precursor prepared above, put it in a tube furnace, and pass ammonia gas after vacuuming. The flow rate of ammonia gas is 200ml / min, keep...

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Abstract

The invention relates to a boron nitride hollow tube with a tube wall formed by directional coverage of lamellas, and a preparation method of the boron nitride hollow tube mainly comprises the following steps: taking ammonia water, boric acid and magnesium nitrate as raw materials, and carrying out hydrothermal reaction to obtain a boron-containing precursor; then, calcining the boron-containing precursor in a nitrogen-containing atmosphere to obtain a nitridation product; then, mixing the nitridation product with ammonium chloride, and putting the mixture into a high-pressure reaction kettle for reaction to obtain the boron nitride with the hollow structure. According to the invention, the boron nitride hollow tube with the tube wall formed by directional coverage of the lamellas is prepared by a high-pressure synthesis process after high-temperature nitridation of a boron-containing precursor for the first time.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a boron nitride hollow tube in which a sheet layer is directionally covered to form a tube wall and a preparation method thereof. Background technique [0002] Boron nitride (BN) is called "white graphite", its structure is similar to graphite, but it has more excellent physical and chemical properties than graphite, such as high heat resistance and thermal conductivity, excellent dielectric properties (high temperature insulation good), good high temperature stability, low thermal expansion coefficient, good lubricity and chemical stability (excellent corrosion resistance), etc. In recent years, with the vigorous development of materials, materials have developed from zero-dimensional, one-dimensional, two-dimensional, etc. to multi-dimensional structures. According to the different dimensions, morphology and size, boron nitride materials include nanotubes, microt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
CPCC01B21/064B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2004/62C01P2004/64C01P2004/13Y02E30/30
Inventor 王吉林李正德吉钰纯陈文卓宣伟萍顾远平周美均郑国源龙飞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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