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Single-layer kaolin modified ultrafine heavy calcium carbonate and preparation method thereof

A technology of heavy calcium carbonate and kaolin, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve problems such as large specific surface area, high surface energy, and easy powder agglomeration, and achieve simple operation process, Reduce agglomeration and overlap, and design scientific and reasonable effects

Active Publication Date: 2016-11-09
JIANGXI GUANGYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although ground calcium carbonate has excellent comprehensive physical and chemical properties and is widely used in all aspects of national production and life, its large specific surface area, high surface energy, and easy agglomeration of powder seriously affect its excellent performance and product application. Effect

Method used

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  • Single-layer kaolin modified ultrafine heavy calcium carbonate and preparation method thereof
  • Single-layer kaolin modified ultrafine heavy calcium carbonate and preparation method thereof
  • Single-layer kaolin modified ultrafine heavy calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of monolayer kaolin nanosheets

[0024] Add kaolin powder into tap water, ultrasonically vibrate for 0.5-12h, add carboxyl modifier proportional to kaolin nanosheets, mechanically stir or ultrasonically vibrate for 1-4h, stir it evenly with nitrogen bubbling, and then heat up to 60 °C. o C, gradually add 1.5M sodium hydroxide solution dropwise to adjust the pH of the reaction system to 7-12, and heat to 90 after the reaction for 0.5-2h o C, continue the reaction for 1-4h, the reaction product is washed three times with tap water, centrifuged, and dried in a vacuum drying box for 24h to obtain monolayer kaolin nanosheets; the carboxyl modifier used is sodium alginate, and the seaweed The mass ratio of sodium to ground calcium carbonate is 1:5.

[0025] (2) Preparation of single-layer kaolin modified ground calcium carbonate

[0026] The calcium carbonate coarse material with a diameter of less than 5 cm is sent into the grinding machine, and the surfact...

Embodiment 2

[0032] (1) Preparation of monolayer kaolin nanosheets

[0033] Add kaolin powder into tap water, ultrasonically vibrate for 0.5-12h, add carboxyl modifier proportional to kaolin nanosheets, mechanically stir or ultrasonically vibrate for 1-4h, stir it evenly with nitrogen bubbling, and then heat up to 60 °C. o C, gradually add 1.5M sodium hydroxide solution dropwise to adjust the pH of the reaction system to 7-12, and heat to 90 after the reaction for 0.5-2h o C, continue the reaction for 1-4h, the reaction product is washed three times with tap water, centrifuged, and dried in a vacuum drying oven for 24h to obtain single-layer kaolin nanosheets; the carboxyl modifier used is sodium carboxymethyl cellulose, The mass ratio of the sodium carboxymethyl cellulose to the ground calcium carbonate is 1:200.

[0034] (2) Preparation of single-layer kaolin modified ground calcium carbonate

[0035] The calcium carbonate coarse material with a diameter of less than 5 cm is sent into ...

Embodiment 3

[0041] (1) Preparation of monolayer kaolin nanosheets

[0042] Add kaolin powder into tap water, ultrasonically vibrate for 0.5-12h, add carboxyl modifier proportional to kaolin nanosheets, mechanically stir or ultrasonically vibrate for 1-4h, stir it evenly with nitrogen bubbling, and then heat up to 60 °C. o C, gradually add 1.5M sodium hydroxide solution dropwise to adjust the pH of the reaction system to 7-12, and heat to 90 after the reaction for 0.5-2h o C, continue the reaction for 1-4h, the reaction product is washed three times with tap water, centrifuged, and dried in a vacuum drying oven for 24h to obtain single-layer kaolin nanosheets; the carboxyl modifier used is polyacrylamide, and the polymer The mass ratio of acrylamide to ground calcium carbonate is 1:1000.

[0043] (2) Preparation of single-layer kaolin modified ground calcium carbonate

[0044] The calcium carbonate coarse material with a diameter of less than 5 cm is sent into the grinding machine, and t...

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Abstract

Single-layer kaolin modified ultrafine heavy calcium carbonate and a preparation method thereof. The method comprises the following steps: firstly preparing carboxyl-modified single-layer kaolin nanosheet by a polymer-assisted liquid-phase stripping method; grinding calcium carbonate coarse powder into 5-10 micrometers of fine powder in the presence of a surfactant; adding the carboxyl-modified single-layer kaolin nanosheet dispersion liquid to prepare slurry with solid content being 70-80%; and stir-grinding by a wet method to obtain the modified ultrafine heavy calcium carbonate with the particle size being 0.1-1 micrometer. The design is scientific and reasonable; the operation process is simple; the production cost is low; and the product is easy for large-scale production. In addition, agglomeration and overlapping of particles can be reduced, powder fluidity of particles can be enhanced, and dispersity of particles in a polymer matrix can be improved. The invention is of great significance for improving comprehensive performance of the polymer matrix and expanding application fields of heavy calcium carbonate.

Description

technical field [0001] The invention relates to a single-layer kaolin modified ultrafine heavy calcium carbonate and a preparation method thereof, belonging to the technical field of fine chemical calcium carbonate powder. Background technique [0002] Heavy calcium carbonate is an important inorganic chemical product, and its industrial products are ground from natural carbonate minerals such as calcite, marble, and limestone. It is a commonly used powdery inorganic filler with the advantages of high chemical purity, good thermal stability, low oil absorption and low hardness and wear. Calcium carbonate has been widely used in various fields such as papermaking, plastics, chemical fiber, rubber, adhesives, sealants, cosmetics, building materials, coatings, medicine, food and feed, etc. Its functions include: increasing product volume, reducing production costs, and improving processing performance ( Such as adjusting viscosity, rheological properties, vulcanization propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/08
CPCC01P2006/22C09C1/022C09C3/006C09C3/041C09C3/06C09C3/08
Inventor 王光硕彭鹤松宋建强曾伟李永安
Owner JIANGXI GUANGYUAN CHEM
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