Preparation method of modified superfine calcium carbonate powder and product of preparation method

A technology of ultrafine calcium carbonate and powder, which is applied in chemical instruments and methods, dyeing physical treatment, dyeing organic silicon compound treatment, etc., can solve the problem of inability to effectively improve the dry and wet covering effect of architectural coatings, the addition of titanium dioxide, the ultrafine weight The high surface activity of high-quality calcium carbonate powder affects the performance and product application effect, and achieves excellent anti-sedimentation effect, improved storage stability, and excellent modification effect.

Inactive Publication Date: 2017-02-22
JIANGXI GUANGYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, ordinary superfine ground calcium carbonate powder itself has high surface activity, is easy to agglomerate, and has poor dispersion. Therefore, when it is added to architectural coatings (such as latex paint) as a filler, its steric hindrance effect cannot b

Method used

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  • Preparation method of modified superfine calcium carbonate powder and product of preparation method
  • Preparation method of modified superfine calcium carbonate powder and product of preparation method
  • Preparation method of modified superfine calcium carbonate powder and product of preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Calcite ore and kaolin are crushed at a ratio of 100:1, and ground into 400 mesh dry powder, which is configured into a slurry with a solid content of 80%, and three kinds of polyacrylic acid ammonium salt, sodium hexametaphosphate and polyacrylic acid sodium salt are added to disperse agent, the dispersant accounts for 6% of the dry powder mass fraction, and the ratio of the three dispersants is 6:1:7. The dispersed slurry is poured into a 3600L vertical wet grinder for wet grinding, and ground into a slurry with a fineness of 10,000 mesh. After flash drying, it is collected by a cloth bag and added to a mixer for depolymerization and dispersing. It maintains the original particle size of the particles, and then puts them into the surface modifier through a spiral reamer, and adds a solid modifier, a liquid modifier and a hyperdispersant with a certain powder mass ratio respectively, and performs wrapping treatment to further improve Its dispersing effect avoids second...

Embodiment 2

[0040] Calcite ore and kaolin are crushed at a ratio of 80:1, and ground into 400 mesh dry powder, which is configured into a slurry with a solid content of 80%, and three kinds of polyacrylic acid ammonium salt, sodium hexametaphosphate and polyacrylic acid sodium salt are added to disperse The dispersant accounts for 6% of the dry powder mass fraction, and the ratio of the three dispersants is 9:1:4. The dispersed slurry is poured into a 3600L vertical wet grinder for wet grinding, and ground into a slurry with a fineness of 8000 meshes. After being flashed and dried, it is collected by a cloth bag and added to a dispersing machine for depolymerization and dispersing. It maintains the original particle size of the particles, and then puts them into the surface modifier through a spiral reamer, and adds a solid modifier, a liquid modifier and a hyperdispersant with a certain powder mass ratio respectively, and performs wrapping treatment to further improve Its dispersing effect...

Embodiment 3

[0043] Calcite ore and kaolin are crushed at a ratio of 50:1, and ground into 400 mesh dry powder, which is configured into a slurry with a solid content of 80%, and three kinds of polyacrylic acid ammonium salt, sodium hexametaphosphate and polyacrylic acid sodium salt are added to disperse agent, the dispersant accounts for 6% of the dry powder mass fraction, and the ratio of the three dispersants is 4:1:5. The dispersed slurry is poured into a 3600L vertical wet grinder for wet grinding, and ground into a slurry with a fineness of 9000 mesh. After flash drying, it is collected by a cloth bag and added to a disperser for depolymerization and dispersal. It maintains the original particle size of the particles, and then puts them into the surface modifier through a spiral reamer, and adds a solid modifier, a liquid modifier and a hyperdispersant with a certain powder mass ratio respectively, and performs wrapping treatment to further improve Its dispersing effect avoids second...

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Abstract

The invention provides a preparation method of modified superfine calcium carbonate powder. The preparation method comprises following steps: raw material mixing, slurry preparation, wet grinding, drying collection, depolymerization scattering and modified treatment, wherein a dispersing agent at least comprises ammonium polyacrylate salt, sodium hexametaphosphate and sodium polyacrylate salt; a modifying agent comprises one or more of octadecylamine, polymethyl methacrylate, a titanate coupling agent and a silane coupling agent; and a hyperdispersant comprises one or more of a polyester type hyperdispersant, a polyether type hyperdispersant, a polyacrylate hyperdispersant and a polyolefin hyperdispersant. By virtue of the preparation method, the dispersity of the powder can be improved, the dry-wet cover effects of building coatings can be improved, and the addition amount of titanium dioxide can be reduced.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of modified calcium carbonate powder, in particular to a method for preparing modified superfine calcium carbonate powder specially used for architectural coatings and a product thereof. [0003] 【Background technique】 [0004] Calcium Carbonate is an important and widely used inorganic salt. Heavy Calcium Carbonate (Heavy Calcium Carbonate), also known as Ground Calcium Carbonate (GCC for short, or Kotamite in the United States), is produced by directly crushing natural calcite, marble, limestone, etc. by mechanical means. Because its sedimentation volume (1.1-1.9mL / g / g) is smaller than that of light calcium carbonate produced by chemical methods (2.4-2.8mL / g), it is called heavy calcium carbonate. [0005] Ground calcium carbonate can be divided into coarsely ground calcium carbonate (greater than 3 μm), finely ground calcium carbonate (1-3 μm), and ultra-fine calcium carbonate (0.5-1 μm) accordin...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/08C09C3/10C09C3/12
CPCC09C1/021C01P2006/12C01P2006/22C09C3/006
Inventor 李海滨徐永华周峰李永安张翔
Owner JIANGXI GUANGYUAN CHEM
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