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Method for preparing nano-calcium carbonate whisker/hexagonal boron nitride nanocomposite material

A nano-composite material, hexagonal boron nitride technology, applied in the direction of calcium carbonate/strontium/barium, nitrogen compounds, chemical instruments and methods, etc., can solve the problems that the whisker size is not easy to control, does not reach the nano-scale, and has high equipment requirements, Achieve the effect of low cost, good high temperature resistance, safe and simple method

Active Publication Date: 2018-01-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem with the high gravity crystallization method and the apatite hydrothermal synthesis method is that the size of the synthesized whiskers is not easy to control
The sol-gel method needs to be reacted at 700°C, which requires high equipment and high cost
In addition, no matter which method, the diameter of the synthesized calcium carbonate whiskers is above 100nm, which does not reach the nanoscale

Method used

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  • Method for preparing nano-calcium carbonate whisker/hexagonal boron nitride nanocomposite material
  • Method for preparing nano-calcium carbonate whisker/hexagonal boron nitride nanocomposite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 8 g of commercially available hexagonal boron nitride powder and add it into 100 ml of deionized water for 8 h of ultrasonication. Pour the sonicated solution into a centrifuge tube and centrifuge at 8000 rpm for 5 minutes. Pour the supernatant into a beaker and dry it at 80 degrees Celsius to obtain a powder.

[0023] Weigh 2.2g calcium chloride and dissolve in 100ml deionized water. Weigh 100 mg of the above dried powder and add it into the calcium chloride solution, stir and heat. Weigh 2.1g of sodium carbonate and dissolve in 100ml of deionized water. After the mixed solution of calcium chloride and powder is heated to 30 degrees Celsius, sodium carbonate solution is added dropwise thereto at a speed of 1 ml / min, and the insulation is continued for 50 minutes after the dropwise addition is completed. Cool to room temperature when finished. The solution cooled to room temperature was poured into a centrifuge tube and washed five times by centrifugation at 6...

Embodiment 2

[0025] Weigh 8 g of commercially available hexagonal boron nitride powder and add it into 100 ml of deionized water for 8 h of ultrasonication. Pour the sonicated solution into a centrifuge tube and centrifuge at 8000 rpm for 5 minutes. Pour the supernatant into a beaker and dry it at 80 degrees Celsius to obtain a powder.

[0026] Weigh 4.4g calcium chloride and dissolve in 200ml deionized water. Weigh 200 mg of the above dried powder and add it into the calcium chloride solution, stir and heat. Weigh 4.2g of sodium carbonate and dissolve in 200ml of deionized water. After the mixed solution of calcium chloride and powder is heated to 40 degrees centigrade, sodium carbonate solution is added dropwise thereto at a speed of 2 ml / min, and the insulation is continued for 60 minutes after the dropwise addition is completed. Cool to room temperature when done. The solution cooled to room temperature was poured into a centrifuge tube and washed five times by centrifugation at 60...

Embodiment 3

[0028] Weigh 8 g of commercially available hexagonal boron nitride powder and add it into 100 ml of deionized water for 8 h of ultrasonication. Pour the sonicated solution into a centrifuge tube and centrifuge at 8000 rpm for 5 minutes. Pour the supernatant into a beaker and dry it at 80 degrees Celsius to obtain a powder.

[0029] Weigh 2.2g calcium chloride and dissolve in 100ml deionized water. Weigh 100 mg of the above dried powder and add it into the calcium chloride solution, stir and heat. Weigh 2.1g of sodium carbonate and dissolve in 100ml of deionized water. After the mixed solution of calcium chloride and powder is heated to 50 degrees Celsius, start to drop sodium carbonate solution therein at a speed of 3 ml / min, and continue to insulate for 70 minutes after the dropwise addition. Cool to room temperature when done. The solution cooled to room temperature was poured into a centrifuge tube and washed five times by centrifugation at 6000 rpm with deionized water...

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Abstract

The invention relates to a method for preparing a nano-calcium carbonate whisker / hexagonal boron nitride nanocomposite material. The method comprises stripping hexagonal boron nitride through a simpleultrasonic method, adding the stripped precursor into a calcium chloride solution and synthesizing the nano-calcium carbonate whisker / hexagonal boron nitride nanocomposite material through a simple solution method. The method is simple and safe, realizes a low cost, needs a low temperature and can synthesize calcium carbonate whisker having diameters of about 50nm and good overall uniformity. Thenano-calcium carbonate whisker in the nano-calcium carbonate whisker / hexagonal boron nitride nanocomposite material has a length-diameter ratio of 25-50 satisfying the industrial application requirement. The hexagonal boron nitride has strong oxidation resistance, high temperature resistance and good mechanical properties. The material performances are further improved in application.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of nanometer calcium carbonate whisker / hexagonal boron nitride nanometer material. Background technique [0002] Whiskers are short fibers grown from high-purity single crystals. Their mechanical strength is equal to the force between adjacent atoms. The highly oriented structure of whiskers not only makes them have high strength, modulus and elongation, but also has optical, electrical, magnetic properties. Calcium carbonate whisker is another new type of inorganic filler after nano-calcium carbonate. It is non-toxic, odorless, and white fluffy solid. Calcium carbonate whisker is a new generation of filler material because of its high comprehensive mechanical strength, It is widely used because of its friction coefficient, wear resistance and heat resistance. [0003] At present, the main preparation methods of calcium carbonate whiskers are: calcium bi...

Claims

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Application Information

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IPC IPC(8): C01B21/064C01F11/18B82Y40/00
Inventor 李炫华朱金萌张媛媛魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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