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Preparation method and application of boron nitride foams

A technology of boron nitride and foam, applied in chemical instruments and methods, applications, inorganic chemistry, etc., can solve problems such as overcooling and leakage, and achieve the effects of low reaction temperature, low energy consumption, and simple synthesis process

Active Publication Date: 2018-09-11
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second object of the present invention is to provide a method to solve the problems of energy storage efficiency, leakage and overcooling of phase change energy storage materials in the application process.

Method used

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  • Preparation method and application of boron nitride foams
  • Preparation method and application of boron nitride foams
  • Preparation method and application of boron nitride foams

Examples

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preparation example Construction

[0033] (1) a preparation method of boron nitride foam, comprising the steps of:

[0034] 1) Dissolving boron source and nitrogen source in water to obtain a colorless and transparent solution; the boron source is boric acid, phenylboronic acid, sodium borohydride, boramine or borax. The nitrogen source is urea, melamine, biuret, ammonium borate, ammonium chloride, ammonium nitrate or dicyandiamide. In molar ratio, boron source: nitrogen source=1: (1-10).

[0035] 2) Add the template agent to the colorless transparent solution obtained in step 1), pull and soak repeatedly, and dry the obtained product to obtain the precursor. The template agent is melamine sponge, mineral wool or cotton fabric. The drying is vacuum drying, vacuum freeze drying or blast drying.

[0036] 3) Put the precursor obtained in step 2) in a high-temperature furnace, and under the protection of an inert gas, raise the temperature to 800-1900°C at a heating rate of 1-15°C / min, and react at this temperat...

Embodiment 1

[0042] (1) The preparation method is as follows:

[0043] 1) Dissolve 0.1 mol of boric acid and 0.3 mol of urea in 80 mL of 45°C water under magnetic stirring at a molar ratio of 1:3 to obtain a colorless and transparent solution.

[0044] 2) Put the melamine sponge into the colorless transparent solution, pull and soak repeatedly until the melamine sponge is saturated, then place it in a vacuum freeze dryer, and dry it for 48 hours at a temperature of -50°C and a pressure of 26Pa , to obtain a white bulk precursor.

[0045] 3) Put the white bulk precursor in a high-temperature furnace, raise the temperature to 1000°C at a rate of 5°C / min under a nitrogen protective gas, and react at this temperature for 3 hours to obtain a crude product.

[0046] 4) Place the obtained crude product in ethanol and water for ultrasonication for 5 hours, and then place it in a vacuum drying oven at 110° C. for 12 hours to obtain a boron nitride foam with a yield of 80.1% and a purity of 99.3%, ...

Embodiment 2

[0052] The method is the same as in Example 1, except that the molar ratio of boric acid and urea is changed to 1:1, 1:5, 1:7, and the results are shown in Table 1.

[0053] Table 1

[0054]

[0055]

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Abstract

The invention discloses a preparation method and application of boron nitride foams. The method comprises the steps that a boron source and a nitrogen source are dissolved in water to obtain a colorless transparent solution, a template agent is added to the colorless transparent solution, repeatedly lifting and dropping are conducted for soaking, and obtained products are dried to obtain precursors; the precursors are placed in a high-temperature furnace, the temperature of the precursors is increased to 800-900 DEG C in the temperature raising rate of 1-15 DEG C / min under the protection of inert gases, and reaction is conducted for 1-10 hours under the temperature to obtain crude products; after the crude products are washed by deionized water and ethanol, vacuum drying is conducted to obtain the boron nitride foams. The boron nitride foams synthesized by means of the method have more extensive pore size distribution and large specific surface area and can be used as absorbents of pollutants and carriers of heat conductive fillers and catalysts, the preparation process is simple, raw materials are cheap, special catalysts and other additives are not needed, and the method is green and environmentally friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to the preparation of boron nitride foam material and its application in energy storage, belonging to the science of inorganic non-metallic materials. Background technique [0002] As a new type of synthetic inorganic non-metallic material, boron nitride has a series of excellent physical and chemical properties, such as: high stability, high melting point, high thermal conductivity, low density, low electrical conductivity and excellent mechanical properties. It has been widely used in electronic packaging materials, heat-resistant materials, heat-conducting materials and sewage treatment materials. [0003] At present, the basic principle of industrial production of boron nitride is that the boron source and the nitrogen source are heated and refined together. Commonly used boron sources are mainly boric acid and borax; commonly used nitrogen sources are mainly urea, ammonium chloride and melamine. However, the synthesized bor...

Claims

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Application Information

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IPC IPC(8): C04B35/583C04B35/622C04B38/06B01J20/02B01J20/28B01J20/30C02F1/28B01J27/24C09K5/06C09K5/14
CPCB01J20/0259B01J20/28045B01J27/24C02F1/281C04B35/583C04B35/622C04B38/0615C04B2235/3409C04B2235/48C04B2235/6562C04B2235/6567C09K5/063C09K5/14C04B38/0074C04B38/0054
Inventor 张向东韩维坊白宇峰葛春华张蕊关宏宇
Owner LIAONING UNIVERSITY
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