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Preparation method and usage of spherical nanometer calcium carbonate

A technology of nano-calcium carbonate and spherical shape, which is applied in applications, household appliances, fibrous fillers, etc., can solve the problems of lower added value, limit the application and promotion of nano-calcium made from carbide slag, and achieve increased added value, small particle size, and reduced The effect of craft difficulty

Inactive Publication Date: 2013-09-18
石家庄市油漆厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nano-calcium carbonate obtained by ordinary methods is mostly used as an additive in industries such as plastics due to the problem of dispersion stability, and is rarely used in the coating industry, which greatly reduces the added value of the nano-calcium carbonate prepared from calcium carbide slag. Limiting the application and promotion of calcium carbide slag production of nano-calcium technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of solution: directly add calcium carbide slag to 3 times of water and mix evenly, add ammonium chloride to the calcium carbide slag slurry at a ratio of 1:1.0 by weight of calcium carbide slag (dry basis) to ammonium chloride, and adjust the pH Value = 7-8, leached and stirred at room temperature for 1 hour, and filtered to remove insoluble matter to obtain a clear solution.

[0021] (2) Carbonization: Put the above clarified solution in the reaction device, control the reaction temperature between 5°C, and pass CO while stirring. 2 Carry out carbonization reaction, keep CO 2 The gas flow rate is 0.1 / min, the stirring rate is 100-3000 rpm (rev / min), and the pH value change of the reaction system is monitored with a pH meter or pH test paper. When the pH value of the reaction system decreases from strong alkalinity to lower than 7.0, the reaction can be terminated to obtain the reactant nano-calcium carbonate, which is filtered and washed to obtain a so...

Embodiment 2

[0025] (1) Solution preparation: directly add calcium carbide slag to 4 times of water and mix evenly, add glutamic acid to the calcium carbide slag slurry according to the weight ratio of calcium carbide slag (dry basis) and glutamic acid as 1:1.5, and adjust the pH Value = 7-8, leached and stirred at room temperature for 6 hours, and filtered to remove insoluble matter to obtain a clear solution.

[0026] (2) Carbonization: Put the above clarified solution in the reaction device, control the reaction temperature between 35°C, and feed CO while stirring. 2 Carry out carbonization reaction, keep CO 2 The gas flow rate is 0.5 / min, the stirring rate is 100-3000 rpm (rev / min), and the pH value change of the reaction system is monitored with a pH meter or pH test paper. When the pH value of the reaction system decreases from strong alkalinity to lower than 7.0, the reaction can be terminated to obtain the reactant nano-calcium carbonate, which is filtered and washed to obtain a s...

Embodiment 3

[0029] (1) Solution preparation: directly add calcium carbide slag to 6 times of water and mix evenly, add glycine to the calcium carbide slag slurry at a ratio of 1:2.0 by weight of calcium carbide slag (dry basis) and glycine, and adjust the pH value=7~ 8. Leach and stir the reaction at room temperature for 2 hours, and obtain a clear solution after filtering to remove insoluble matter.

[0030] (2) Carbonization: Put the above clarified solution in the reaction device, control the reaction temperature between 45°C, and pass CO while stirring. 2 Carry out carbonization reaction, keep CO 2 The gas flow rate is 2.5 / min, the stirring rate is 100-3000 rpm (rev / min), and the pH value change of the reaction system is monitored with a pH meter or pH test paper. When the pH value of the reaction system decreases from strong alkalinity to lower than 7.0, the reaction can be terminated to obtain the reactant nano-calcium carbonate, which is filtered and washed to obtain a solid produ...

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Abstract

The invention relates to a preparation method and usage of spherical nanometer calcium carbonate. The surface of the spherical nanometer calcium carbonate is wrapped by the coating which is formed by mixing and atomizing the coupling agent and the polymer pigment dispersant, wherein the proportion of the coupling agent to the polymer pigment dispersant is 1:0.5-2.0. The spherical nanometer calcium carbonate has good dispersity and stability and high purity. The paint contains the spherical nanometer calcium carbonate can be stored for 15 days at 50 DEG C without being changed in the fineness and the quality and becoming coarse. The spherical nanometer calcium carbonate is prepared from the raw material of calcium carbide slag with obviously reduced process difficulty and cost and without high-temperature calcination for pretreatment. The spherical nanometer calcium carbonate is wrapped by the coating, thus the dispersity and the stability of the spherical nanometer calcium carbonate in the paint and the ink are improved, the application range is widened and the additional value is increased, and the spherical nanometer calcium carbonate is suitable for industrial production on a larger scale.

Description

technical field [0001] The invention relates to a spherical nano-calcium carbonate, a preparation method and an application of the spherical nano-calcium carbonate. Background technique [0002] According to statistics, the annual production of calcium carbide in the country is about 20 million tons. Based on the calculation of 1.2 tons of waste residue for every ton of calcium carbide consumed, the annual production of calcium carbide slag will reach more than 24 million tons. The main component of calcium carbide slag is calcium hydroxide (the content reaches more than 90%), and it also contains some other impurities such as SiO 2 , Fe 2 o 3 , MgO, Al 2 o 3 and carbon residue, etc. Light calcium carbonate is made from limestone, which is digested into calcium hydroxide slurry and then carbonized with carbon dioxide. Light calcium carbonate has a wide range of uses, mainly used as fillers in industries such as rubber, plastics, papermaking, coatings, inks, etc. It can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/10C09D7/12C09D11/02C09D167/08C09D11/00
Inventor 王怀奎
Owner 石家庄市油漆厂
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