A kind of preparation method of flame-retardant large-diameter flake calcium carbonate

A flaky calcium carbonate, large-diameter technology, applied in the field of calcium carbonate, can solve the problems of narrow particle size distribution, covering power to be improved, etc., and achieve the effect of narrow particle size distribution, increased diameter-thickness ratio, and uniform particles.

Active Publication Date: 2019-11-15
浙江振鑫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese invention patent CN101514533A discloses a flaky calcium carbonate and its preparation method and application. This method uses a simple mechanical grinding method to obtain flaky calcium carbonate, and the particles are uniform and the particle size distribution is narrow. However, the flaky calcium carbonate obtained by this method The diameter of flaky calcium carbonate is 0.2-0.6μm, and the ratio of diameter to thickness is (10-30): 1. Its hiding power still needs to be improved, so it is necessary to study a preparation method of flame-retardant large-diameter flaky calcium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of flame-retardant large-diameter flake calcium carbonate, comprising the following steps:

[0027] A, adding fibrous light calcium carbonate to water;

[0028] B. Add composite grinding aid, dispersant, aluminum-magnesium hydrotalcite and graphene to the water, and obtain slurry after dispersing evenly;

[0029] C. Grinding the slurry to obtain flame-retardant large-diameter flake calcium carbonate.

[0030] The fibrous light calcium carbonate has an aspect ratio of (60-120):1.

[0031] The compound grinding aids are sodium polyacrylate and sodium hexametaphosphate.

[0032] The graphene-specific dispersant is the winsperse4900 graphene dispersant produced by Weibosi New Materials (Weifang) Co., Ltd.

[0033] In the step B, the amount of the compound grinding aid, dispersant, aluminum-magnesium hydrotalcite and graphene is respectively 0.5%, 0.02%, 0.8% and 0.004% of the dry weight of light calcium carbonate.

Embodiment 2

[0035] A preparation method of flame-retardant large-diameter flake calcium carbonate, comprising the following steps:

[0036] A, adding fibrous light calcium carbonate to water;

[0037] B. Add composite grinding aid, dispersant, aluminum-magnesium hydrotalcite and graphene to the water, and obtain slurry after dispersing evenly;

[0038] C. Grinding the slurry to obtain flame-retardant large-diameter flake calcium carbonate.

[0039] The fibrous light calcium carbonate has an aspect ratio of (60-120):1.

[0040] The compound grinding aids are sodium polyacrylate and sodium hexametaphosphate.

[0041] The graphene-specific dispersant is the winsperse4900 graphene dispersant produced by Weibosi New Materials (Weifang) Co., Ltd.

[0042] In the step B, the addition amount of the composite grinding aid, dispersant, aluminum-magnesium hydrotalcite and graphene is 0.2%, 0.03%, 0.2% and 0.005% of the dry weight of light calcium carbonate respectively.

Embodiment 3

[0044] A preparation method of flame-retardant large-diameter flake calcium carbonate, comprising the following steps:

[0045] A, adding fibrous light calcium carbonate to water;

[0046] B. Add composite grinding aid, dispersant, aluminum-magnesium hydrotalcite and graphene to the water, and obtain slurry after dispersing evenly;

[0047] C. Grinding the slurry to obtain flame-retardant large-diameter flake calcium carbonate.

[0048] The fibrous light calcium carbonate has an aspect ratio of (60-120):1.

[0049] The compound grinding aids are sodium polyacrylate and sodium hexametaphosphate.

[0050] The graphene-specific dispersant is the winsperse4900 graphene dispersant produced by Weibosi New Materials (Weifang) Co., Ltd.

[0051] In the step B, the additions of the composite grinding aid, dispersant, aluminum-magnesium hydrotalcite and graphene are respectively 1%, 0.01%, 1% and 0.001% of the dry weight of light calcium carbonate.

[0052] After testing, the diamet...

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Abstract

The invention provides a preparing method of inflame-retarding type big-diameter plate-shaped calcium carbonate. On the basis of a traditional preparing method of plate-shaped calcium carbonate, the draw ratio of fibroid light calcium carbonate is adjusted, graphene is added, in a grinding process, graphene is regarded as a base plane, the diameter of obtained plate-shaped calcium carbonate is obviously increased, the radius-thickness ratio is also increased accordingly, and meanwhile the advantages of the traditional method that the particles are uniform, the particle diameters are narrow in distribution are maintained, and the inflame-retarding type big-diameter plate-shaped calcium carbonate is large in superficial area and high in covering power; magnesium-aluminum hydrotalcite of which the particle diameter is 50-200 micrometers is added to conduct joint grinding, on one hand, the lamellar surface of the magnesium-aluminum hydrotalcite is tiled with graphene, and the radius-thickness ratio of calcium carbonate is further increased; on the other hand, in the grinding process, the magnesium-aluminum hydrotalcite forms nanoscale small particles, the nanoscale small particles are dispersed to the surface of plate-shaped calcium carbonate, and prepared plate-shaped calcium carbonate has a certain inflaming retarding effect.

Description

technical field [0001] The invention relates to the technical field of calcium carbonate, in particular to a method for preparing flame-retardant large-diameter flake calcium carbonate. Background technique [0002] Calcium carbonate is an inorganic compound, commonly known as: limestone, limestone, stone powder, marble, etc. Main ingredient: Calcite, chemical formula is CaCO 3 , Neutral, basically insoluble in water, soluble in hydrochloric acid. It is a common substance on the earth and exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also the main component of animal bones or shells. Calcium carbonate is an important building material and is widely used in industry. Calcium carbonate is formed by combining calcium ions and carbonate ions, so it is both a calcium salt and a carbonate. [0003] According to different production methods of calcium carbonate, calcium carbonate can generally be divided into heavy calcium carbonate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCC01F11/185C01P2004/60
Inventor 朱自学
Owner 浙江振鑫新材料科技有限公司
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