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A kind of functional white pigment prepared with calcined kaolin as carrier and its preparation method and application

A technology of calcining kaolin and white pigments, which is applied in the direction of inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc. It can solve the problems of insufficient hiding power, large particle size distribution and influence on the use effect, etc., and achieve good hiding power , low price, resource saving effect

Active Publication Date: 2020-08-11
张建平 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, white pigments are mainly prepared from titanium dioxide. However, in order to save expensive titanium dioxide resources, there are many varieties of similar white pigments in the market. Due to the different formula processing equipment and processing technology, the product quality varies greatly.
Its whiteness, especially its hiding power, is far inferior to ordinary titanium dioxide, and the surface of the product has not been activated, so its dispersion is poor, and the particle size distribution is wide, which seriously affects the use effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Kaolinite (dickite) is crushed into fragments with a particle size of 1-3cm by a hammer crusher, and then ground into a fine powder with a particle size of 6-8μm by a ball mill, and the fine powder is loaded into calcined After the box, it enters the tunnel kiln, and is calcined with the high-temperature gas generated by the gas generator. The calcined temperature is 1200 ° C, and the temperature is kept for 11 hours. After cooling, the porous spongy calcined kaolin with a particle size of 6-8 μm and a whiteness of 99% is obtained.

[0034] 50Kg of the calcined kaolin and 80Kg of water are prepared into slurry A, 30Kg of titanium dioxide, 20Kg of calcium carbonate, 10Kg of barium sulfate and 50Kg of water are prepared into slurry B, and slurry A of slurry B and 1kg of diethylene glycol are added to the sand After grinding in the mill for one hour, a functional white pigment slurry was prepared.

[0035] Slurry properties: whiteness: 98.5%, particle size: D 90 =2.5μm, h...

Embodiment 2

[0039] Kaolinite (dickite) is crushed into fragments with a particle size of 1-2cm by a hammer crusher, and then ground into a fine powder with a particle size of 6-7μm by a ball mill, and the fine powder is loaded into calcined After the box, it enters the tunnel kiln, and is calcined with the high-temperature gas generated by the gas generator. The calcined temperature is 1200°C, and the temperature is kept for 10 hours. After cooling, the porous spongy calcined kaolin with a particle size of 6-7 μm and a whiteness of 99.5% is obtained.

[0040] 20Kg of the calcined kaolin and 50Kg of water are formulated into slurry A, 10Kg of titanium dioxide, 20kg of calcined talc, 10Kg of calcium carbonate, 10Kg of zinc oxide and 50Kg of water are formulated into slurry B, and slurry A of slurry B is mixed with 0.6 After adding kg alkyl phosphate diethanolamine salt into a sand mill and grinding for one hour, a functional white pigment slurry was obtained.

[0041] Slurry properties: whi...

Embodiment 3

[0045] Kaolinite (dickite) is crushed into fragments with a particle size of 5 cm with a hammer crusher, and then ground into fine powder with a particle size of 8-10 μm with a ball mill, and the fine powder is loaded into a calcination box and then processed The tunnel kiln is calcined with high-temperature gas generated by the gas generator, the calcined temperature is 1200°C, the temperature is kept for 12 hours, and the porous spongy calcined kaolin with a particle size of 8-10 μm and a whiteness of 98.5% is obtained after cooling.

[0046] 60Kg of the calcined kaolin and 50Kg of water are formulated into slurry A, 10Kg of titanium dioxide, 20kg of calcined talc, 10Kg of calcium carbonate, 10Kg of zinc oxide and 50Kg of water are formulated into slurry B, and slurry A of slurry B is mixed with 0.4 kg stearic acid, 0.5 kg 2-methyl-2-hydroxymethyl-1.3 propanediol (TME) was added into a sand mill and ground for one hour to prepare a functional white pigment slurry.

[0047] S...

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Abstract

The invention relates to a functional white pigment prepared by taking clacined kaolin as a carrier, and a preparation method and application thereof. The preparation method comprises: crushing kaolin, performing ball milling and calcing, so as to form calcined kaolin, then using the calcined kaolin and a pigment auxiliary material to respectively prepare aqueous slurries with certain solid contents, then performing sand milling on the two aqueous slurries and a processing auxiliary agent, so as to prepare a white pigment slurry with the particle size of 2-4 mu m, removing water and drying to obtain the functional white pigment with the whiteness of 98% or more and the particle size of 2-4 mu m. A hydrophilic or lipophilic functional white pigment can be prepared based on different selection on the processing auxiliary agents, the hydrophilic functional white pigment is applied to aqueous paint and papermaking industry, and the lipophilic functional white pigment is applied to plastic, rubber, oil paint and powdery paint industry.

Description

technical field [0001] The invention relates to the field of pigment preparation, in particular to a functional white pigment prepared by using calcined kaolin as a carrier, a preparation method and application thereof. Background technique [0002] At present, white pigments are mainly prepared from titanium dioxide. However, in order to save expensive titanium dioxide resources, there are many types of white pigment products in the market. Due to the different formula processing equipment and processing technology used, the product quality varies greatly. Its whiteness, especially its hiding power, is far inferior to that of ordinary titanium dioxide, and the surface of the product has not been activated, so its dispersion is poor, and its large particle size distribution is wide, which seriously affects the use effect. [0003] The present invention adopts sponge-like calcined kaolin with good whiteness, small particle size, and multi-aperture as the carrier, and adds a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/42C09C3/06C09C3/08D21H17/69
Inventor 张建平张易坤陈丽君
Owner 张建平