Method for preparing ultrafine calcium carbonate

A technology of ultrafine calcium carbonate and stearic acid, applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of immature preparation technology of ultrafine calcium carbonate, and achieve The effect of preventing adhesion and block, easy reaction process, and scientific and reasonable preparation method

Inactive Publication Date: 2018-05-11
南晓慧
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is exactly to provide a kind of preparation method of superfine calcium carbonate for the problem that the preparation technology of domestic superfine calcium carbonate is not mature yet

Method used

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Embodiment 1

[0009] A preparation method of superfine calcium carbonate, comprising the following steps: firstly take 10 parts by weight of quicklime, add a small amount of water to digest it naturally, then continue to add water to make the total amount of the solution reach 30 parts by weight, stir it evenly, and filter it out with a 120-mesh sieve. slag, and then put the obtained milk of lime in a carbonization reactor, then add 30 parts by weight of water, add 0.001-0.002 parts by weight of hydroxyethyl diphosphonic acid, stir evenly, heat up to 70 ° C, keep the temperature, and pass in carbon dioxide and air Mixed gas, when the pH is stable at 7.5, stop carbonization; then take out the carbonization liquid, add a certain proportion of water, stir at a constant temperature at 80°C, add a mixture of stearic acid and sodium dodecylbenzenesulfonate After reacting for 2 hours, stop the reaction, filter under reduced pressure after the temperature of the solution drops to 40°C, wash the filt...

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Abstract

The invention discloses a method for preparing ultrafine calcium carbonate. The method comprises the following steps: taking quicklime, adding a small amount of water to naturally digest the quicklime, continuously adding water, uniformly stirring the obtained solution, filtering the solution by a 120 mesh sieve to remove residues, placing the obtained lime milk in a carbonization reactor, addingwater and hydroxyethyldiphosphonic acid, uniformly stirring above materials, heating the obtained mixture to 65-80 DEG C, keeping the temperature constant, introducing a carbon dioxide and air mixed gas, and stopping carbonization when the pH value stabilizes at 7.2-8.4; and taking out the obtained carbonized solution, adding a small amount of water, stirring the solution at 80-90 DEG C, adding astearic acid and sodium dodecyl benzene sulfonate mixed solution, carrying out a reaction for 1.5-2 h, stopping the reaction, carrying out reduced pressure filtration after the solution is cooled to 40-50 DEG C, and washing the filtered solution with water to obtain calcium carbonate with the particle size being 0.01-0.03 [mu]m. The preparation method has the advantages of scientific and reasonable property, simple process route, small investment, easiness in control of the reaction process, and extremely high economic values.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a preparation method of ultrafine calcium carbonate. Background technique [0002] Ultrafine calcium carbonate refers to calcium carbonate with primary particle size between 0.02-0.1μm. It was first developed in Japan and is the cheapest nanomaterial. It has special quantum size effect and small size effect. , surface effect, which makes it show obvious advantages compared with conventional powder materials in terms of reinforcement, transparency, dispersion, thixotropy and leveling, especially active ultrafine calcium carbonate, which has functional fillers Its characteristics greatly broaden its scope of application, and its toughening and reinforcing effect greatly improves and improves the performance and quality of products in related industries. Ultrafine calcium carbonate can be used as a filler in high-end cosmetics, soaps, facial cleansers, and children's toothpa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/183C01P2004/62
Inventor 南晓慧
Owner 南晓慧
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