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Superfine ground calcium carbonate as well as preparation method and application thereof

A heavy calcium carbonate, calcium carbonate technology, applied in fibrous filler, dyeing physical treatment, dyeing low molecular organic compound treatment and other directions, can solve problems such as easy to produce agglomeration, achieve good modification effect, low oil absorption value, activation good effect

Active Publication Date: 2022-07-08
JIANGXI GUANGYUAN CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although precipitated nano-calcium can improve mechanical properties and reduce certain costs, the particles of nano-calcium carbonate in the precipitation method have reached the nanometer level during the chemical reaction generation process, but it is easy to agglomerate in the subsequent drying process

Method used

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  • Superfine ground calcium carbonate as well as preparation method and application thereof
  • Superfine ground calcium carbonate as well as preparation method and application thereof
  • Superfine ground calcium carbonate as well as preparation method and application thereof

Examples

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preparation example Construction

[0025] The invention provides a kind of preparation method of superfine heavy calcium carbonate, comprising the following steps:

[0026] The calcium carbonate and calcium carbonate concentrate are successively crushed and dry ground to obtain calcium carbonate coarse powder;

[0027] The calcium carbonate coarse powder is mixed with water to obtain calcium carbonate coarse powder slurry;

[0028] Mixing the calcium carbonate coarse powder slurry, polymer dispersant and anti-settling agent for wet grinding to obtain calcium carbonate fine powder;

[0029] Mixing the calcium carbonate fine powder with a surface modifier for modification to obtain the ultrafine heavy calcium carbonate, the surface modifier includes an aluminate coupling agent, phosphate esters and alkylamidopropyl betaine.

[0030] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the field.

[0031] In the present invention, calcium carbon...

Embodiment 1

[0062] 1. Select calcium carbonate concentrate with calcium carbonate content ≥ 98%, after cleaning, drying and two-stage Erzian crushing, dry grinding to obtain 600-mesh calcium carbonate coarse powder;

[0063] 2. Mixing the calcium carbonate coarse powder with water to obtain a calcium carbonate coarse powder slurry with a solid content of 70%;

[0064] 3. Mix sodium polymethacrylate and sodium methylene dinaphthalene sulfonate with water at 85°C, respectively, to prepare 0.5% polysodium methacrylate dispersant by mass of calcium carbonate and 0.3% methylene by mass of calcium carbonate. Sodium dinaphthalene sulfonate;

[0065] 4. The calcium carbonate coarse powder slurry obtained in step 2 is subjected to wet grinding, and in the grinding process, sodium methylene dinaphthalene sulfonate and sodium polysodium methacrylate dispersant prepared in step 3 are added for liquid phase dispersion, and the slurry is dispersed. The temperature of the mill is controlled at 80°C, th...

Embodiment 2

[0069] 1. Select calcium carbonate concentrate with calcium carbonate content ≥ 98%, after cleaning, drying and two-stage Erzian crushing, dry grinding to obtain 500-mesh calcium carbonate coarse powder;

[0070] 2. Mix the calcium carbonate coarse powder with water to obtain a calcium carbonate coarse powder slurry with a solid content of 68%;

[0071] 3. Mix sodium polymethacrylate and sodium methylene dinaphthalene sulfonate with water at 85°C to prepare 0.4% sodium polymethacrylate dispersant by mass of calcium carbonate and 0.4% methylene dinaphthalene by mass of calcium carbonate Sodium sulfonate;

[0072] 4. The calcium carbonate coarse powder slurry obtained in step 2 is subjected to wet grinding, and in the grinding process, sodium methylene dinaphthalene sulfonate and sodium polysodium methacrylate dispersant prepared in step 3 are added for liquid phase dispersion, and the slurry is dispersed. The temperature of the mill is controlled at 80°C, the grinding feed rat...

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Abstract

The invention provides superfine ground calcium carbonate as well as a preparation method and application thereof, and belongs to the technical field of superfine inorganic powder. Comprising the following steps that calcium carbonate concentrate is sequentially subjected to crushing and dry grinding, and calcium carbonate coarse powder is obtained; mixing the calcium carbonate coarse powder with water to obtain calcium carbonate coarse powder slurry; mixing the calcium carbonate coarse powder slurry, a polymeric dispersant and an anti-precipitating agent, and carrying out wet grinding to obtain calcium carbonate fine powder; the calcium carbonate fine powder and a surface modifier are mixed for modification, the superfine heavy calcium carbonate is obtained, and the surface modifier comprises an aluminate coupling agent, phosphate esters and alkyl amide propyl betaine. The superfine ground calcium carbonate powder prepared by the invention is good in fineness, large in specific surface area and good in compatibility with PVC (Polyvinyl Chloride) resin, the surface glossiness and toughness are not worse than those of precipitated nano calcium, the later printing of the PVC edge band is not influenced, and the superfine ground calcium carbonate powder replaces the traditional precipitated nano calcium to be applied to the same-color trimmed PVC edge band.

Description

technical field [0001] The invention relates to the technical field of ultrafine inorganic powders, in particular to an ultrafine heavy calcium carbonate and a preparation method and application thereof. Background technique [0002] With the continuous development of the country, the improvement of people's living standards and the improvement of the demand for material quality, the application requirements of PVC edge strips in furniture, office, kitchen utensils, teaching equipment, civil laboratories and other fields have also been continuously improved, especially in Some high-end furniture and office equipment have higher requirements for PVC edge bands, and the surface gloss and toughness requirements are very good. The color of the trimmed side should be close to the surface color, not whitish, with good gloss, and the overall color of the product should be coordinated. Wait. As the main inorganic filler in the production of PVC edge banding, calcium carbonate can n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/04C08L27/06C08K9/04C08K3/26
CPCC09C1/021C09C3/08C09C3/041C09C3/006C08L27/06C08K2201/006C08K2003/265C08L23/06C08K9/04C08K3/26
Inventor 邓克文宋波李晓丹李海滨
Owner JIANGXI GUANGYUAN CHEM