Preparation method of modified nano calcium carbonate

A nano-calcium carbonate, modification technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the impact of structure, performance and application preparation methods and processes, precise control of nano-calcium carbonate, energy-saving and environmentally friendly raw materials Using problems such as increasing difficulty to achieve the effects of reducing interactions, maintaining crystal morphology, and improving surface properties

Active Publication Date: 2020-09-01
襄汾县兴盛建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nano-calcium carbonate is widely used in rubber, plastics, papermaking, chemical building materials, inks, coatings, sealants and adhesives and other industries, especially porous nano-calcium carbonate as an inorganic material, with its large specific surface area, non-toxic, biocompatible However, the structure, performance and application of porous nano-calcium carbonate are seriously affected by its preparation method and process, and the nano-calcium carbonate prepared by different methods presents a wide variety of structures and crystal forms. Accurate control of calcium carbonate production process, energy saving and environmental protection, raw material utilization and other aspects have increased great difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of modified nanometer calcium carbonate, it comprises the following steps:

[0023] (1) Stir and mix quicklime and water according to the ratio of quicklime to water mass ratio of 1:5, then add EDTA and continue to stir for 25 minutes, filter and remove slag after passing through a 200-mesh sieve to obtain lime slurry and adjust the solid content of the lime slurry to 12% for later use; the addition of the EDTA is 15% of the quicklime quality; the calcium oxide content in the quicklime is more than 95%, and the content of silicon dioxide is less than 2%; the stirring speed is 600r / min;

[0024] (2) Weigh tannic acid, polyvinyl alcohol and deionized water according to the mass ratio of tannic acid, polyvinyl alcohol and water at a ratio of 2.5:4:100, then mix tannic acid with deionized water and vibrate ultrasonically for 15 minutes Obtain solution A, then add polyvinyl alcohol to solution A under stirring condition, heat to 90°C, keep the temperatur...

Embodiment 2

[0029] A preparation method of modified nanometer calcium carbonate, it comprises the following steps:

[0030] (1) Stir and mix quicklime and water according to the ratio of quicklime to water mass ratio of 1:3, then add EDTA and continue to stir for 30 minutes, filter and remove slag after passing through a 150 mesh sieve to obtain lime slurry and adjust the solid content of the lime slurry to 10% for later use; the addition of the EDTA is 10% of the quicklime quality; the calcium oxide content in the quicklime is more than 95%, and the content of silicon dioxide is less than 2%; the stirring speed is 500r / min;

[0031] (2) Weigh tannic acid, polyvinyl alcohol and deionized water according to the mass ratio of tannic acid, polyvinyl alcohol and water at a ratio of 3:6:100, then mix tannic acid with deionized water and vibrate ultrasonically for 10 minutes Obtain solution A, then add polyvinyl alcohol to solution A under stirring conditions, heat to 85°C, keep the temperature...

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PUM

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Abstract

The invention discloses a preparation method of modified nano calcium carbonate. The preparation method comprises the following steps of: proportionally stirring and mixing quick lime and water, adding EDTA, performing continuous stirring, enabling an obtained mixture to pass through a 150-200-mesh sieve, and performing filtering, and removing slag to obtain lime slurry for later use; mixing tannic acid with deionized water to obtain a solution A, adding polyvinyl alcohol into the solution A under a stirring condition, heating an obtained mixture solution to 85-90 DEG C, keeping the temperature constant for 3-5 hours, and naturally cooling a product to 20-25 DEG C to obtain hydrogel; mixing the lime slurry with the hydrogel to obtain a mixed solution B, adding carbon dioxide into the mixedsolution B for carbonization reaction, heating the mixed solution B to 50-60 DEG C, keeping the temperature constant, adding stearic acid, urea and starch into the mixed solution B, stirring and mixing an obtained solution for 2-5 hours, and performing filtering and drying to obtain the modified nano calcium carbonate. By adopting the method, the crystal form of the nano calcium carbonate productcan be improved and controlled, and the loose and porous nano calcium carbonate product with large specific surface area is obtained.

Description

technical field [0001] The invention belongs to the technical field of calcium carbonate production, and in particular relates to a preparation method of modified nanometer calcium carbonate. Background technique [0002] Nano-calcium carbonate, also known as ultra-fine calcium carbonate, refers to calcium carbonate particles with characteristic dimensions on the order of nanometers (1-100nm), including ultra-fine calcium carbonate (particle size 0.02-0.1μm) collectively referred to in the light calcium carbonate industry And ultra-fine calcium carbonate (particle size ≤ 0.02μm), due to the ultra-fine nano-scale calcium carbonate, its particle crystal structure and surface electronic structure change, resulting in quantum size effect and small size effect that ordinary calcium carbonate does not have , surface effects and macroscopic quantum effects, and show superior performance compared with conventional materials in terms of magnetism, catalyst, photothermal resistance an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01F11/16B82Y30/00B82Y40/00C04B2/06
CPCC01F11/183C01F11/181C01F11/185C01F11/16B82Y30/00B82Y40/00C04B2/063C04B2/06C01P2004/64C01P2006/12C01P2006/80
Inventor 韦明
Owner 襄汾县兴盛建材有限公司
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