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Preparation method of rodlike nano-calcium carbonate

A nano-calcium carbonate and rod-shaped technology, applied in the field of calcium carbonate, can solve the problems of poor particle dispersibility and stability, complicated preparation process of rod-shaped nano-calcium carbonate, etc., and achieve the effects of simple operation, good application prospect, uniform and controllable size.

Inactive Publication Date: 2016-03-23
CHANGSHU HONGYU CALCIFICATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the existing rod-shaped nano-calcium carbonate is complicated, and the particle dispersibility and stability are relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of rod-shaped nano-calcium carbonate, comprising the steps of:

[0020] (1) Calcination: put the calcite in a muffle furnace and calcine at 1000°C for 3 hours to obtain calcium oxide powder;

[0021] (2) Digestion reaction: After cooling the calcium oxide powder obtained in step (1), dissolve it in deionized water at a solid-to-liquid ratio of 1g / L, stir and disperse it ultrasonically, and prepare an emulsion;

[0022] (3) Carbonization: To the emulsion obtained in step (3), add the crystal form control agent sodium sulfate in an amount of 2 g per liter of emulsion, stir evenly, place in an ice-water bath, detect the temperature and pH value of the emulsion in real time, and Keep the temperature constant at 18°C, and then pass in carbon dioxide gas while stirring. When the pH value of the mixed solution is above 5.0, add 5g of dispersant (polyethylene glycol and polyvinyl alcohol at a ratio of 1:1) to each liter of mixed solution. mass ratio mixed ...

Embodiment 2

[0025] A preparation method of rod-shaped nano-calcium carbonate, comprising the steps of:

[0026] (1) Calcination: put the calcite in a muffle furnace and calcine at 1100°C for 1 hour to obtain calcium oxide powder;

[0027] (2) Digestion reaction: After cooling the calcium oxide powder obtained in step (1), dissolve it in deionized water at a solid-to-liquid ratio of 3g / L, stir and ultrasonically disperse, and prepare an emulsion;

[0028] (3) Carbonization: To the emulsion obtained in step (3), add the crystal form control agent sodium sulfate in an amount of 5 g per liter of emulsion, stir evenly, place in an ice-water bath, detect the temperature and pH value of the emulsion in real time, and Keep the temperature constant at 22°C, and then pass in carbon dioxide gas while stirring. When the pH value of the mixed solution is above 5.0, add 8g of dispersant (polyethylene glycol and polyvinyl alcohol at a ratio of 1:1) to each liter of mixed solution. mass ratio mixed mixt...

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Abstract

The invention discloses a preparation method of rodlike nano-calcium carbonate. The method comprises the steps of: (1) calcination; (2) slaking reaction; (3) carbonization; and (4) drying moulding. The rodlike nano-calcium carbonate obtained by the method provided by the invention has an average particle size of 180-260nm, a length of 0.8-1 micrometer, a width of 60-90nm, and a surface Zeta potential ranging from -10 to -30mV. The preparation method of the rodlike nano-calcium carbonate provided by the invention has the advantages of simple operation, easy realization and good repeatability. The prepared calcium carbonate nanorods have the characteristics of uniform and controllable size, good dispersibility and stable performance, and have good application prospects.

Description

technical field [0001] The invention relates to the field of calcium carbonate, in particular to a method for preparing rod-shaped nanometer calcium carbonate. Background technique [0002] Calcium carbonate has extensive and important uses in many fields such as coatings, rubber, plastics, agriculture, medicine, and pharmacy. The practical application of calcium carbonate is closely related to its properties (such as morphology, particle size, Zeta potential, specific surface area, etc.). Due to its small size effect, surface effect and high specific surface area, nanoscale calcium carbonate particles endow it with great application potential. [0003] The morphology of the nano-calcium carbonate prepared in the prior art includes hollow nano-calcium carbonate particles, flake, cube, porous nano-calcium carbonate and rod-shaped nano-calcium carbonate. Among them, it has potential application value in biomedical utilization such as gene and drug carriers and tissue enginee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCC01F11/182C01P2004/16C01P2004/62C01P2006/22
Inventor 周建新
Owner CHANGSHU HONGYU CALCIFICATION CO LTD
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