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Preparation method of composite calcium carbonate

A technology for compounding calcium carbonate and calcium hydroxide, which is applied in chemical instruments and methods, dyeing polymer organic compound treatment, fibrous fillers, etc. It can solve problems such as easy peeling, low coating rate, and difference in titanium dioxide coating rate. , to achieve the effect of improving hiding power, simple production process, and high UV absorption intensity

Active Publication Date: 2014-07-02
北京中互睿石新材料科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is that when there is no dispersant in the carbonization reaction process, the coating rate of titanium dioxide in the calcium carbonate-titanium dioxide particles is not high and is easy to peel off. The defect that the coverage rate of titanium dioxide in the product varies greatly

Method used

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  • Preparation method of composite calcium carbonate
  • Preparation method of composite calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0017] At 40°C and a stirring speed of 800 rpm, add 7.4% of calcium hydroxide mass rutile titanium dioxide and 0.074% polyethylene glycol or polyethylene glycol to the calcium hydroxide slurry with a mass fraction of 10%. Alcohol ester (molecular weight 1000), mechanically stirred for 30 minutes, and then at a rate of 120 liters / min, a mixed gas of carbon dioxide and nitrogen with a volume ratio of 1:2 was passed through for carbonization reaction. When the pH value of the solution was 7, the reaction was stopped. A white water slurry was obtained; the white water slurry was centrifugally dehydrated and dried at 120° C. for 4 hours.

[0018] The whiteness value of the composite calcium carbonate is 96.3, the yield rate is 97%, and the coating rate of calcium carbonate reaches 94%. When the composite calcium carbonate is observed with a scanning electron microscope, rutile-type titanium dioxide is coated on the surface of the calcium carbonate, and no separate titanium dioxide ...

Embodiment 2

[0020] Under the conditions of 50°C and a stirring speed of 800 rpm, add 11.1% rutile titanium dioxide and 0.296% polyethylene glycol or polyethylene glycol to the calcium hydroxide slurry with a mass fraction of 10%. Alcohol ester (molecular weight 2000), mechanically stirred for 40 minutes, and then at a rate of 90 liters / min, a mixed gas of carbon dioxide and nitrogen with a volume ratio of 1:2 was passed through for carbonation reaction. When the pH value of the reaction solution was 7, stop react to obtain a white water slurry; the white water slurry is subjected to centrifugal dehydration, and then dried at 120° C. for 4 hours.

[0021] The whiteness value of the composite calcium carbonate is 97.2, the yield rate is 98%, and the coating rate of calcium carbonate is 96%. When the composite calcium carbonate is observed with a scanning electron microscope, rutile-type titanium dioxide is coated on the surface of the calcium carbonate, and no separate titanium dioxide exis...

Embodiment 3

[0023] Under the conditions of 50°C and a stirring speed of 900 rpm, add 14.8% of calcium hydroxide mass rutile titanium dioxide and 0.518% polyethylene glycol or polyethylene glycol to the calcium hydroxide slurry with a mass fraction of 15%. Alcohol esters (molecular weight 6000), mechanically stirred for 50 minutes, and then at a rate of 80 liters / minute, a mixture of carbon dioxide and nitrogen with a volume of 1:2 was passed through to carry out carbonation reaction. When the pH value of the reaction solution was 7, stop react to obtain a white water slurry; the white slurry is subjected to centrifugal dehydration, and then dried at 120° C. for 4 hours.

[0024] The whiteness value of the composite calcium carbonate is 96.8, the yield rate is 97%, and the coating rate of calcium carbonate is 94%. When the composite calcium carbonate is observed with a scanning electron microscope, rutile-type titanium dioxide is coated on the surface of the calcium carbonate, and no separ...

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Abstract

The invention relates to a preparation method of composite calcium carbonate, belonging to the technical field of inorganic synthesis. The preparation method comprises the following steps: by using polyethyleneglycol or polyglycol esters as a dispersant, adding titanium dioxide and the dispersant into calcium hydroxide slurry, and introducing a gas mixture of carbon dioxide and nitrogen in a volume ratio of 1:2 to perform carburizing reaction, thereby obtaining the composite calcium carbonate. The obtained composite calcium carbonate product has the structure that spindle-shaped calcium carbonate particle surfaces are uniformly coated with titanium dioxide nanoparticles. The prepared composite calcium carbonate has the characteristics of high ultraviolet absorption intensity, high whiteness, high covering power, high weather resistance and the like, and has a bactericidal action; and the preparation method has the characteristics of simple manufacturing technique, mild reaction conditions and the like, and can easily implement industrial production.

Description

technical field [0001] The invention relates to the technical field of inorganic synthesis, in particular to a preparation method of composite calcium carbonate. Background technique [0002] As an important inorganic chemical raw material, calcium carbonate has the characteristics of abundant resource reserves, non-toxic, odorless, and excellent performance. It is widely used in coatings, plastics, papermaking, rubber, inks and other fields. Especially in the field of paint, calcium carbonate has received more and more attention. In the water-based paint industry, calcium carbonate can prevent paint from settling, make the paint dispersible and high gloss, and the amount of calcium carbonate in water-based paint accounts for 20%. ~60%. Calcium carbonate not only acts as a skeleton in the coating, but also can increase the thickness of the coating film, improve the wear resistance of the coating, and significantly improve the adhesion of the coating. Adding calcium carbona...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/10
Inventor 周兵李真黄春影刘忠甫
Owner 北京中互睿石新材料科技有限公司
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