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A kind of spherical boron nitride and its application

A boron nitride, spherical technology, applied in nitrogen compounds, inorganic chemistry, alkali metal compounds, etc., to achieve the effects of low reaction temperature, large specific surface area, and cheap raw materials

Active Publication Date: 2015-10-28
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, although boron nitride materials have obvious advantages in many applications, there is no simple and easy method to prepare high-purity special-type boron nitride products in high yield.

Method used

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  • A kind of spherical boron nitride and its application
  • A kind of spherical boron nitride and its application
  • A kind of spherical boron nitride and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 spherical boron nitride

[0028] (1) Preparation method

[0029] 1) Dissolve glucose, urea and boric acid in a molar ratio of 1:1:1 in water with the assistance of magnetic stirring to obtain a colorless and transparent solution;

[0030] 2) Put the colorless and transparent solution into a 100ml stainless steel hydrothermal reaction kettle, put the reaction kettle into a constant temperature oven, and keep it warm at 180°C for 24 hours; naturally cool down to room temperature, filter the product, and wash it with water and ethanol several times in sequence , dried to give a brown solid;

[0031] 3) Put the brown solid in a high-temperature furnace, raise the temperature to 450°C at a rate of 1°C per minute under air atmosphere, and keep it at this temperature for 2 hours to obtain a light yellow solid;

[0032] 4) Put the light yellow solid in a container, under the protection of nitrogen, raise the temperature to 900°C at a rate of 1°C per minute, and k...

Embodiment 2

[0038] Embodiment 2 spherical boron nitride

[0039] The preparation method is the same as in Example 1, except that the molar ratio of glucose, urea and boric acid is changed. The results are shown in Table 1.

[0040] Table 1

[0041] Glucose: Urea: Boric acid

[0042] It can be seen from Table 1 that the size of the sphere can be controlled by changing the amount of glucose to meet different needs.

Embodiment 3

[0043] Example 3 spherical boron nitride

[0044] The preparation method is the same as in Example 1, except that the urea in step 1) is changed to melamine, biuret, ammonium chloride or ammonium nitrate respectively, and the results are shown in Table 2.

[0045] Table 2

[0046] nitrogen source

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Abstract

The invention relates to spherical boron nitride and an application thereof. The spherical boron nitride is prepared by taking a template agent, boric acid and carbamide as raw materials. The preparation method comprises the following steps: dissolving the template agent, a nitrogen source and a boron source into water till a solution is clear; filling the clear solution into a hydrothermal reaction kettle for heating to prepare a precursor; calcining the precursor at an air atmosphere; carrying out high temperature pyrolysis at a protective atmosphere; and soaking an obtained product, then repeatedly cleaning the product by using the water and ethanol to obtain large-surface area spherical boron nitride. The spherical boron nitride synthesized through the method has the advantages of large specific area, higher organic pollutant absorption capacity, simple preparation process, low-cost raw material without a particular catalyst and other additives. The method disclosed by the invention is green and environment-friendly.

Description

technical field [0001] The invention relates to a spherical boron nitride material with high adsorption activity, which belongs to the science of inorganic non-metallic materials. Background technique [0002] As an important inorganic non-metallic material, boron nitride has a series of excellent performance characteristics such as good mechanical properties, high thermal conductivity, stable chemical properties, and strong oxidation resistance. Materials, catalyst supports, environmental protection and other fields have potential application value. [0003] At present, industrially produced boron nitride powders are produced in batches from simple raw materials such as boric acid and urea or melamine through metallurgical pyrolysis reactions. The surface area is very low. But even so, boron nitride powder still has many uses, such as being used in the manufacture of high temperature resistant crucibles, insulators, release agents, lubricants, etc. At present, many new h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064B01J20/02B01J20/28B01J20/30C02F1/28
Inventor 张向东杨玉清王平葛春华卢丙增韩潍坊关宏宇
Owner LIAONING UNIVERSITY
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