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High-stability calcium hydroxide/graphene nanocomposite and preparation method

A nano-composite material, calcium hydroxide technology, applied in the field of high-stability calcium hydroxide/graphene nano-composite materials and preparation, can solve problems such as difficult to disperse, not well resolved, and easy agglomeration of nano-calcium hydroxide , to achieve the effect of simple preparation process, strong stability and simple preparation process

Active Publication Date: 2016-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-calcium hydroxide synthesized by chemical methods has always been prone to agglomeration and difficult to disperse, which limits its application in cultural relics protection.
Researchers have also adopted many methods to solve this problem, such as using TX-100, SDS, isopropanol and other modifications to prepare nano calcium hydroxide, but the above problems have not been well resolved.

Method used

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  • High-stability calcium hydroxide/graphene nanocomposite and preparation method
  • High-stability calcium hydroxide/graphene nanocomposite and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] CaCl with a configured concentration of 0.2mol / L (volume 100ml) 2 Heat on a magnetic stirrer with constant vigorous stirring. When the temperature reaches 90°C, add CaCl at a rate of 4ml / min 2 NaOH solution with a solubility of 0.4mol / L (volume 100ml) was added dropwise into the solution. Continue to keep warm for 20min after the dropwise addition. After the reaction was completed, the solution was naturally cooled to room temperature. Then centrifuge (8000 rpm, 5 minutes), wash with water three times, and then vacuum dry at 110° C. for 24 hours.

[0026] Weigh 20 mg of graphene oxide powder and dissolve in 60 ml of deionized water. Weigh 10 mg of PVP and dissolve in the above deionized water. Weigh 0.5g of nano calcium hydroxide powder and pour it into the above solution. Finally, the above solution was poured into an 80ml polytetrafluoroethylene liner, and finally sealed with a cylinder, and placed in an oven at 100°C for 24 hours. Centrifuge (8000 rpm, 10 minu...

Embodiment 2

[0028] CaCl with a configured concentration of 0.4mol / L (volume 100ml) 2 Heat on a magnetic stirrer with constant vigorous stirring. When the temperature reaches 90°C, add CaCl at a rate of 4ml / min 2 NaOH solution with a solubility of 0.8mol / L (volume 100ml) was added dropwise into the solution. Continue to keep warm for 20min after the dropwise addition. After the reaction was completed, the solution was naturally cooled to room temperature. Then centrifuge (8000 rpm, 5 minutes), wash with water three times, and then vacuum dry at 110° C. for 24 hours.

[0029] Weigh 40 mg graphene oxide powder and dissolve it in 60 ml deionized water. Weigh 20 mg of PVP and dissolve it in the above deionized water. Weigh 1g of nano calcium hydroxide powder and pour it into the above solution. Finally, the above solution was poured into an 80ml polytetrafluoroethylene liner, and finally sealed with a cylinder, and placed in an oven at 120°C for 36h. Centrifuge (8000 rpm, 10 minutes) 3 ...

Embodiment 3

[0031] CaCl with a configured concentration of 0.6mol / L (volume 100ml) 2 Heat on a magnetic stirrer with constant vigorous stirring. When the temperature reaches 90°C, add CaCl at a rate of 4ml / min 2 NaOH solution with a solubility of 1.2mol / L (volume 100ml) was added dropwise into the solution. Continue to keep warm for 40min after the dropwise addition. After the reaction was completed, the solution was naturally cooled to room temperature. Then centrifuge (8000 rpm, 5 minutes), wash with water three times, and then vacuum dry at 110° C. for 24 hours.

[0032] Weigh 60 mg of graphene oxide powder and dissolve in 60 ml of deionized water. Weigh 40mg of PVP and dissolve it in the above deionized water. Weigh 1.5g of nano calcium hydroxide powder and pour it into the above solution. Finally, the above solution was poured into an 80ml polytetrafluoroethylene liner, and finally sealed with a cylinder, and placed in an oven at 140°C for 48 hours. Centrifuge (8000 rpm, 10 mi...

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Abstract

The invention relates to a high-stability calcium hydroxide / graphene nanocomposite and a preparation method. Firstly, nano calcium hydroxide is synthesized with a simple precipitation method; graphene oxide (prepared with a Hummer's method) and nano calcium hydroxide are mixed at a certain proportion for hydrothermal treatment, and the calcium hydroxide / graphene nanocomposite can be prepared. The preparation process is simple and time-saving. The microstructure of the calcium hydroxide / graphene nanocomposite prepared with the method is shown in a monodisperse state formed by wrapping calcium hydroxide nanoparticles with graphene. More importantly, the composite can be kept for at least three months in isopropanol and cannot precipitate; the calcium hydroxide / graphene nanocomposite has super-high stability. Compared with the prior art, the provided calcium hydroxide / graphene nanocomposite has the advantage that the preparation process is simple, time-saving and controllable.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a high-stability calcium hydroxide / graphene nanocomposite material and a preparation method. Background technique [0002] Calcium hydroxide has a wide range of uses, such as plastering walls with lime mortar, producing calcium carbonate, and apex induction in medical treatment, etc. (Ning Jia. Clinical analysis of curative effect of Vitapex paste and calcium hydroxide paste in the treatment of chronic apical periodontitis[D]. Jilin University, 2014) [0003] Since the application of nano-calcium hydroxide in the restoration of murals in 2001, the application of nano-calcium hydroxide in the protection of cultural relics has gradually attracted people's attention. In 2006, S. Sequeir et al. used nano-calcium hydroxide to deacidify paper cultural relics and achieved good results. (Journal of Cultural Heritage 2006,7,264-272.) Nano calcium hydroxide has also been applied in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02C01B31/04B82Y30/00
CPCB82Y30/00C01F11/02C01P2002/72C01P2004/03C01P2004/61C01P2004/80
Inventor 李炫华朱金萌魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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