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A preparation method of porous boron nitride fiber with high specific surface area

A boron nitride fiber, high specific surface area technology, applied in the direction of inorganic raw material rayon, etc., can solve the problems of high cost, high risk, long production cycle of freeze-drying technology, unsuitable for large-scale production, etc. Crystallinity, the effect of strong practicality

Active Publication Date: 2021-11-16
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are many deficiencies in these preparation methods, such as the need to use toxic organic solvents, the need to use liquid nitrogen in the preparation process, the cost is high and has certain risks, and the freeze-drying technology used has a long production cycle and is not suitable for large-scale production. mass production

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  • A preparation method of porous boron nitride fiber with high specific surface area
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preparation example Construction

[0039] A preparation method of porous boron nitride fiber. This method mainly has four steps. Mainly, the precursor is prepared in a water bath, dried after suction filtration, calcined in a nitrogen atmosphere, and decarbonized by air heat treatment.

[0040] (1). Add boric acid, melamine and PEG600 into a container filled with deionized water, then put it into a water bath with a temperature of 90°C, and stir until a clear solution is obtained. After natural cooling, a white floc was obtained, and after suction filtration, a white solid was obtained.

[0041] (2). Wherein, the concentration of melamine is 0.125mol / ml, the concentration of boric acid is 0.375mol / ml, and the molar ratio boric acid: melamine is 3:1. The content of PEG600 is 0.5%, 1%, 2%.

[0042] (3). Place the white solid obtained in step 1 in an oven between 85° C. and 90° C. and keep it warm for 3-4 hours. A white solid is obtained, which is the boron nitride precursor.

[0043] (4). The boron nitride p...

Embodiment 1

[0048] A method for preparing porous boron nitride fibers with a high specific surface area, comprising the following steps:

[0049] (1). Put weighing paper and a clean beaker on the electronic balance, take 4.635g of boric acid, 3.15g of melamine and 2g of PEG600 with a clean medicine spoon, and put them into the beaker. Pipette 200ml of deionized water with a graduated cylinder and pour it into the same beaker.

[0050](2). Put the mixed solution in a water bath and heat it in the water bath. The temperature of the water bath was 90 °C until the mixed solution became a clear solution. Stop heating, the mixed solution is gradually cooled to room temperature, and white flocculent precipitates gradually precipitate out of the solution. The obtained solution is suction filtered, and the obtained solid is placed in an oven for drying. The drying temperature is 90°C, and the holding time is 3h. , to obtain the boron nitride precursor.

[0051] (3). The obtained precursor was p...

Embodiment 2

[0055] A method for preparing porous boron nitride fibers with a high specific surface area, comprising the following steps:

[0056] (1). Put weighing paper and a clean beaker on the electronic balance, take 4.635g of boric acid, 3.15g of melamine and 4g of PEG600 with a clean medicine spoon, and put them into the beaker. Pipette 200ml of deionized water with a graduated cylinder and pour it into the same beaker.

[0057] (2). Put the mixed solution in a water bath and heat it in the water bath. The temperature of the water bath was 90 °C until the mixed solution became a clear solution. Stop heating, the mixed solution is gradually cooled to room temperature, and white flocculent precipitates gradually precipitate out of the solution. The obtained solution is suction filtered, and the obtained solid is placed in an oven for drying. The drying temperature is 90°C, and the holding time is 3h. , to obtain the boron nitride precursor.

[0058] (3). The obtained precursor was ...

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Abstract

The invention belongs to the field of preparation of boron nitride fibers, and relates to a preparation method of porous boron nitride fibers with high specific surface area. The method of the invention adopts boric acid, melamine and PEG600 as raw materials. After water bath, suction filtration, and drying, the melamine diboric acid precursor is obtained, and the boron nitride fiber is obtained by calcining at high temperature. PEG is doped into the precursor fiber as an organic solvent, which improves the surface activity of the precursor fiber, and PEG is decomposed during high temperature calcination to generate gas, which increases the pore content and specific surface area of ​​boron nitride fibers. The porous boron nitride fibers obtained in the present invention have higher purity and lower crystallinity. There are many defects on the fiber surface, which provide a large number of surface adsorption sites. The diameter of the prepared boron nitride fibers is between 1-2 μm and the length is between 4-10 μm. With uniform fiber structure and high specific surface area, the specific surface area reaches 874m 2 / g. The problems of high cost, toxic raw materials and long production cycle of the current porous boron nitride fiber technology are solved.

Description

technical field [0001] The technical solution of the invention relates to the field of preparation of boron nitride fibers, specifically the preparation of a porous boron nitride fiber with a high specific surface area. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The constituent elements of boron nitride are boron (B) atoms and nitrogen (N) atoms, with four different crystal structures, the most common being hexagonal boron nitride (HBN). Others exist, rhombohedral boron nitride (RBN), cubic boron nitride (CBN), and wurtzite boron nitride (WBN). And it has a structure similar to graphite, so it is also called "white graphite". Boron nitride has very excellent proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 钱磊刘洪收谢娇赵洪元
Owner SHANDONG UNIV