Preparation method of nanometer calcium hydroxide/hexagonal boron nitride nano-composite

A nano-composite material, hexagonal boron nitride technology, applied in nitrogen compounds, chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of large calcium hydroxide particles and achieve difficult agglomeration , strong antioxidant, simple effect

Active Publication Date: 2017-09-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of large calcium hydroxide particles in the preparation of composite materials by existing methods, the present invention provides a method for preparing nano calcium hydroxide / hexagonal boron nitride nanocomposite materials

Method used

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  • Preparation method of nanometer calcium hydroxide/hexagonal boron nitride nano-composite
  • Preparation method of nanometer calcium hydroxide/hexagonal boron nitride nano-composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Commercially available hexagonal boron nitride powder was added to dimethylformamide to obtain a 2.9% hexagonal boron nitride solution and sonicated for 8 hours. Pour the sonicated solution into a centrifuge tube and centrifuge at 5000 rpm for 5 minutes. Pour the supernatant into a beaker and dry it at 80 degrees Celsius to obtain a powder.

[0016] Calcium chloride was dissolved in deionized water to obtain a 2.1% calcium chloride solution. The above-mentioned hexagonal boron nitride powder with a mass ratio of 0.013 to calcium chloride was added into the calcium chloride solution with stirring and heated to 60 degrees Celsius. Sodium hydroxide was dissolved in deionized water to obtain a 1.1% sodium hydroxide solution. When the solution of calcium chloride and powder is heated to 60 degrees Celsius, sodium hydroxide solution is added dropwise thereto at a speed of 0.5 ml / min, and the solution is continued to be incubated for 30 minutes after the addition is complete...

Embodiment 2

[0019] Add commercially available hexagonal boron nitride powder into dimethylformamide to obtain a 3.5% hexagonal boron nitride solution and sonicate for 10 h. Pour the sonicated solution into a centrifuge tube and centrifuge at 6000 rpm for 8 minutes. Pour the supernatant into a beaker and dry at 90°C to obtain a powder.

[0020] Calcium chloride was dissolved in deionized water to obtain a 3.3% calcium chloride solution. Said hexagonal boron nitride powder with a mass ratio of 0.014 to calcium chloride was added into the calcium chloride solution with stirring and heated to 70 degrees Celsius. Sodium hydroxide was dissolved in deionized water to obtain a 1.7% sodium hydroxide solution. When the solution of calcium chloride and powder is heated to 70 degrees Celsius, sodium hydroxide solution is added dropwise thereto at a speed of 0.9 ml / min, and the solution is continued to be incubated for 40 minutes after the dropwise addition. After the incubation period, it was cool...

Embodiment 3

[0022] Add commercially available hexagonal boron nitride powder into dimethylformamide to obtain a 4.3% hexagonal boron nitride solution and sonicate for 12 hours. Pour the sonicated solution into a centrifuge tube and centrifuge at 7000 rpm for 10 minutes. Pour the supernatant into a beaker and dry it at 100 degrees Celsius to obtain a powder.

[0023] Calcium chloride was dissolved in deionized water to obtain a 4.3% calcium chloride solution. The above-mentioned hexagonal boron nitride powder with a mass ratio of 0.015 to calcium chloride was added into the calcium chloride solution with stirring and heated to 90 degrees Celsius. Sodium hydroxide was dissolved in deionized water to obtain a 2.3% sodium hydroxide solution. When the solution of calcium chloride and powder is heated to 90 degrees Celsius, sodium hydroxide solution is added dropwise thereto at a speed of 1.1 ml / min, and after the dropwise addition, the temperature is continued for 60 minutes. After the incu...

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Abstract

The invention discloses a preparation method of a nanometer calcium hydroxide/hexagonal boron nitride nano-composite, used for solving the technical problem of large calcium hydroxide particles in a nano-composite prepared by the existing method. According to the technical scheme, the nanometer calcium hydroxide/hexagonal boron nitride nano-composite is synthesized by adding hexagonal boron nitride in the process of synthesizing calcium hydroxide through a solution method. Compared with the prior art, on one hand, the preparation method is simple in preparation process, saves the time, is controllable and is large in quantity; and on the other hand, the particle size of the synthesized nano-composite is about 50 nanometers, so that the nano-composite meets the requirements for the aspect of cultural relic restoration. Meanwhile, with participation of boron nitride, the synthesized calcium hydroxide is not liable in aggregation, so that the technical problems of instability and easiness in aggregation of the synthesized calcium hydroxide are solved. Meanwhile, more importantly, by utilizing the strong oxidation resistance, high temperature resistance and good mechanical properties of the hexagonal boron nitride, the strength of protecting cultural relics is improved.

Description

technical field [0001] The invention relates to a method for preparing a nanocomposite material, in particular to a method for preparing a nanometer calcium hydroxide / hexagonal boron nitride nanocomposite material. Background technique [0002] Calcium hydroxide is extremely versatile. In modern times, people use it in lime mortar to paint walls and produce calcium carbonate. In addition, it is also used in medical treatment, such as apex induction and so on. (Ning Jia. Clinical analysis of the efficacy of Vitapex paste and calcium hydroxide paste in the treatment of chronic apical periodontitis [D]. Jilin University, 2014) In ancient times, people used it as a support for ancient tomb murals. [0003] People have used calcium hydroxide aqueous solution (lime water) for the restoration of murals very early, but because of the low solubility of calcium hydroxide, poor permeability and easy to form white films on the surface of murals and other shortcomings, it has not been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02C01B21/064B82Y40/00
CPCB82Y40/00C01B21/0648C01F11/02C01P2002/72C01P2004/03C01P2004/64
Inventor 李炫华朱金萌张媛媛魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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