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Preparation method of boron nitride fiber three-dimensional structure material and product of boron nitride fiber three-dimensional structure material

A boron nitride fiber and three-dimensional structure technology, applied in the field of ceramic materials, can solve the problems of limited application range, complex reaction and process conditions, and limited high temperature resistance of boron nitride

Active Publication Date: 2018-03-13
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

[0008] Zeng et al. used the modified hydroxylated boron nitride nanosheets as building units, dispersed them in aqueous solution to obtain a homogeneous system, and obtained an aerogel based on boron nitride nanosheets by cryoforming. As a binder, polymers have excellent elasticity and high compressive strength, but the presence of polymers limits the high temperature resistance of boron nitride (X.Zeng, L.Ye, S.Yu, et al. al.,Facile preparation of superelastic and ultralow dielectric boron nitride nanosheet aerogels via freeze-casting process[J].,Chem.Mater.,27(2015)5849-5855.)
[0009] The above-mentioned three-dimensional porous boron nitride structure materials all use nanomaterials as structural units. Although they have the characteristics of light weight and high porosity, their mechanical strength is usually not high and they are easily damaged during use. The stability of the structure can only be ensured by using high-molecular polymers that are not resistant to high temperatures as a binder, which undoubtedly limits the application range of this type of structure.
In addition, due to the limitation of the size of the template and the harsh atmosphere environment and complex and toxic precursors required for the reaction to occur during the template synthesis process, it is difficult to achieve batch production and preparation of this type of method. Low-temperature solidification into a template for the construction of structural units, although the size limit of the inherent template is broken through, the process is simple, but it is necessary to carry out hydrophilic surface modification of structural units such as boron nitride nanosheets, which involves complex reactions and process conditions , is not conducive to promoting

Method used

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  • Preparation method of boron nitride fiber three-dimensional structure material and product of boron nitride fiber three-dimensional structure material
  • Preparation method of boron nitride fiber three-dimensional structure material and product of boron nitride fiber three-dimensional structure material
  • Preparation method of boron nitride fiber three-dimensional structure material and product of boron nitride fiber three-dimensional structure material

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Experimental program
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Embodiment 1

[0058] S1. Synthetic fibrils: add melamine and boric acid to deionized water, add 1.26 grams of melamine and 1.86 grams of boric acid per 100 ml of deionized water, the molar ratio of the two is 1:3, put the system into a water bath at 85 ° C and heat and stir Continue to heat and stir for 30 minutes until the solute is completely dissolved to form a colorless transparent solution; then cool it at 30°C to precipitate a precipitate, and after standing for 24 hours, filter to obtain a solid precipitate and dry it at a constant temperature of 50°C Insulated in the box for 24 hours, a white solid after drying was obtained, figure 1 The scanning electron microscope image shows that it is a fiber morphology, figure 2 The X-ray diffraction pattern shows that its structure is C 3 N 6 h 6 2H 3 BO 3 Molecular crystal, namely M·2B;

[0059] S2. Fibril three-dimensional structure forming: add dry M·2B fibrils to deionized water, add 10.0 grams of fibrils per 100 ml of deionized wa...

Embodiment 2

[0065] S1. Synthetic fibrils: Add melamine and boric acid to water, add melamine and boric acid to water, add 1.26 grams of melamine and 1.24 grams of boric acid per 100 ml of water, the molar ratio of the two is 1:2, put the system in a water bath at 80 °C Heat and stir at medium temperature until the solute is completely dissolved, continue to heat and stir for 10 minutes, and form a colorless transparent solution; then place it at 20°C to cool, and a precipitate precipitates, after standing for 10 hours, filter to obtain a solid precipitate, and place in 80 ℃ in a constant temperature drying oven for 5 hours to obtain dried white M·2B fibrils;

[0066] S2. Fibril three-dimensional structure forming: add dry M·2B fibrils to water, add 5.0 grams of fibrils per 100 ml of water, keep stirring in a water bath at 50°C for 0.5 hours to form a fluid slurry, and pour it into In a cylindrical mold, cool at 20°C and let it stand for 24 hours, then freeze it with liquid nitrogen at -80...

Embodiment 3

[0070] S1. Synthetic fibrils: add melamine and boric acid to deionized water, add 2.52 grams of melamine and 6.20 grams of boric acid per 100 ml of water, the molar ratio of the two is 1:5, put the system into a 95 ° C water bath and heat and stir until the solute Dissolve completely, continue to heat and stir for 30 minutes to form a colorless and transparent solution; then place it at room temperature at 30°C to cool, precipitate precipitates, and after standing for 24 hours, filter to obtain solid precipitates, and place them in a constant temperature drying oven at 60°C Insulated for 15 hours to obtain a dried white solid, i.e. M·2B fibrils;

[0071]S2. Fibril three-dimensional structure forming: add dry M·2B fibrils to water, add 22.5 grams of fibrils per 100 ml of water, heat and stir for 5 hours in a water bath at 95°C to form a fluid slurry, and pour it into In a cylindrical mold, cool at 25°C and let it stand for 24 hours, then put it in the refrigerator to freeze for...

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Abstract

The invention provides a preparation method of a boron nitride fiber three-dimensional structure material and the product of the boron nitride fiber three-dimensional structure material. According tothe preparation method, melamine and boric acid are taken as raw materials, water is taken as a reaction medium, and M.2B (with an English name of Melamine diborate) fibrils can be prepared by means of simple and convenient water bath synthesis; furthermore, the prepared fibrils are taken as a raw material, and a fibril-based three-dimensional net structure is obtained by adopting a freeze-moldingtechnology; the fibril-based three-dimensional net structure is converted into a boron nitride fiber three-dimensional structure by means of the conventional heat treatment process. The technical method provided by the invention is simple and convenient in technology, low in raw material cost and environmentally-friendly; the material provided by the invention has the three-dimensional net structure taking boron nitride fibers as structural units and has the characteristics of being light in weight, high in strength and hydrophobic, thus having wide application prospect in the fields of pollutant treatment, catalyst carriers and enhanced functional composite materials.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for preparing a boron nitride fiber three-dimensional network structure material and a product thereof. Background technique [0002] Boron nitride materials are widely used in aerospace, electrical engineering, Microelectronic devices and metallurgical industry and other fields have a wide range of applications. [0003] As one of them, three-dimensional boron nitride porous ceramics have the characteristics of light weight and high specific surface area, and have important application value in sewage treatment, noble metal catalyst loading and composite material preparation. In recent years, researchers have devoted themselves to the preparation of this type of boron nitride material by using a simple method. Currently, airgel with boron nitride nanosheets and nanotubes as structural units is mainly prepared by two methods: template synthesis and cryoforming...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/583C04B35/622B01J27/24B01J35/06C02F1/28C02F1/40C04B111/40
CPCC02F1/281C02F1/40C04B35/583C04B35/6229C04B38/00B01J27/24C04B2111/40C04B2235/606C04B2235/96C04B2235/77B01J35/58
Inventor 王应德吴纯治
Owner NAT UNIV OF DEFENSE TECH
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