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Ceramic powder with high covering power and method for preparing ceramic powder

A technology of ceramic powder and covering power, which is applied in the field of high covering power ceramic powder and its preparation, can solve the problems of low covering power of ceramic powder, affecting the application performance of end products, etc., and achieves increased surface activation energy and convenient operation. , the effect of high hiding power

Inactive Publication Date: 2018-05-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the ceramic powder prepared with a single kaolin as raw material has low covering power, which affects the application performance of end products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix 100g of kaolin micropowder with 100g of pyrophyllite and put it into a muffle furnace for high-temperature calcination. The calcination temperature is 900°C and the calcination time is 5h. The calcined powder obtained after high-temperature calcination is air-flown in a jet mill Pulverization, the flow rate of the airflow is 120m / s, and the particle size range of the ultrafine powder obtained after the airflow pulverization is 800-1500 mesh;

[0022] (2) Stir 200 g of the ultrafine powder with 20,000 g of water to form a suspension, and add 120 g of urea to the suspension, heat to 90° C. and stir for 1 hour for initial modification to obtain a powder suspension system;

[0023] (3) Add 2000g of titanium dioxide and 2000g of calcium hydroxide to 20320g of the powder suspension system after the primary modification, and continue to stir and react for 1.5h at 90°C for secondary modification, and the resulting reaction mixture is filtered and dried , after breaking ...

Embodiment 2

[0026] (1) Mix 200g of kaolin micropowder with 100g of pyrophyllite and put it into a muffle furnace for high-temperature calcination. The calcination temperature is 1000°C and the calcination time is 4h. The calcined powder obtained after high-temperature calcination is air-flown in a jet mill Pulverization, the flow rate of the airflow is 150m / s, and the particle size range of the ultrafine powder obtained after the airflow pulverization is 1200-1800 mesh;

[0027] (2) Add 300 g of the ultrafine powder to 3000 g of water and stir to form a suspension, and add 9 g of urea to the suspension, heat to 80° C. and stir for 2 hours for initial modification to obtain a powder suspension system;

[0028] (3) Add 330g of titanium dioxide and 330g of calcium hydroxide to 3309g of the powder suspension system after the primary modification, and continue to stir and react for 2 hours at 80°C for secondary modification, and the resulting reaction mixture is filtered and dried. The ceramic...

Embodiment 3

[0031] (1) Mix 300g of kaolin powder and 100g of pyrophyllite and put it into a muffle furnace for high-temperature calcination. The calcination temperature is 1100°C and the calcination time is 3h. The calcined powder obtained after high-temperature calcination is air-flown in a jet mill. Pulverization, the flow rate of the airflow is 170m / s, and the particle size range of the ultrafine powder obtained after the airflow pulverization is 1800-2200 mesh;

[0032] (2) Stir 400 g of the ultrafine powder with 8000 g of water to form a suspension, and add 40 g of urea to the suspension, heat to 90° C. and stir for 1 hour for initial modification to obtain a powder suspension system;

[0033] (3) Add 400g of titanium dioxide and 400g of calcium hydroxide to 8440g of the powder suspension system after the primary modification, and continue to stir and react for 1 hour at 90°C for secondary modification, and the resulting reaction mixture is filtered and dried , after breaking up and ...

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Abstract

The invention discloses ceramic powder with high covering power. The ceramic powder is characterized in that a method for preparing the ceramic powder with the high covering power includes calcining kaolin micro-powder and pyrophyllite at the high temperatures to obtain calcined powder, smashing the calcined powder by airflow to obtain ultrafine powder, adding the ultrafine powder into water, stirring the ultrafine powder and the water to obtain suspension, adding urea into the suspension, heating the urea and the suspension until the temperatures of the urea and the suspension reach 80-95 DEGC, carrying out stirring reaction for 1-2 h and carrying out primary modification to obtain powder and suspension system; adding titanium dioxide powder and calcium hydroxide into the obtained powderand suspension systems, continuing to carry out stirring reaction at the temperature of 80-95 DEG C for 1-2 h, carrying out suction filtration on obtained reaction mixtures, and drying, scattering and dispersing obtained filter residues to obtain the ceramic powder. The kaolin micro-powder and the pyrophyllite are used as mixed matrix raw materials. The ceramic powder and the method have the advantages that the method includes simple and convenient processes and is convenient to operate, the calcined powder is smashed by the airflow, accordingly, the particle sizes of particles of the calcined powder can be reduced, surface activation energy of the calcined powder can be increased, the ceramic powder prepared by the aid of the method is environmentally friendly and is high in covering powder, excellent technical support can be provided to applying terminal products of the ceramic powder, and the like.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a ceramic powder with high hiding power and a preparation method thereof. Background technique [0002] The main raw materials for ceramic production are kaolin, feldspar, quartz, wollastonite, diopside, etc. Their quality directly affects the quality and stability of ceramic products. Only high-quality ceramic raw materials can produce high-quality ceramic products. [0003] Kaolin is a clay mineral with kaolinite and halloysite as the main mineral components. Its structure is dioctahedral, consisting of 1:1 silica tetrahedron and alumina octahedron, silica tetrahedron and alumina octahedron The facets share oxygen atoms, belong to the triclinic crystal system, and its theoretical chemical composition is 46.54% SiO 2 , 39.5% Al 2 o 3 , 13.96% H 2 O, the crystal chemical formula is Al 4 [Si 4 o 10 ](OH) 8 . Kaolin has important properties such as cohesiveness and plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/13
CPCC04B33/1305C04B33/131C04B2235/3208C04B2235/3232C04B2235/96C04B2235/9646
Inventor 张俭盛嘉伟孙青
Owner ZHEJIANG UNIV OF TECH
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