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Method for enhancing oil absorption of calcined kaolin

A technology of calcined kaolin and calcined kaolin powder, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of large equipment investment, complex process, low oil absorption rate, etc., and achieve the effect of low cost

Inactive Publication Date: 2012-05-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's calcined kaolin is generally prepared by calcining coal-based kaolin. The whiteness of the calcined kaolin can reach more than 90%, and the performance is stable, but the oil absorption rate is generally low.
Moreover, there are often problems of complex process and large investment in equipment.
At present, domestic kaolin enterprises increase the oil absorption of calcined kaolin by adjusting the calcination temperature and controlling the particle size of the product, which can increase the oil absorption to 69-72ml / 100g, but it still cannot meet the requirements of the high-end coating field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 20 g of calcined kaolin powder (particle size ≤ 10 μm) and 0.6 g of anhydrous calcium chloride powder (particle size ≤ 10 μm) and place them in a conical flask, and then place them in an oil bath at 80 ° C and stir for 1 hour (fully It can be stirred, usually for 1 to 3 hours), to obtain the product. After testing, the oil absorption of the product is 79.0ml / 100g.

Embodiment 2

[0020] Weigh 20 g of calcined kaolin powder (particle size ≤ 10 μm) and 0.6 g of anhydrous calcium chloride powder (particle size ≤ 10 μm) and place them in a conical flask, then place them in an oil bath at 130 ° C and stir for 1 hour at a constant temperature to obtain product. After testing, the oil absorption of the product is 80.0ml / 100g.

Embodiment 3

[0022] Weigh 20 g of calcined kaolin powder (particle size ≤ 10 μm) and 0.4 g of anhydrous calcium chloride powder (particle size ≤ 10 μm) and place them in a conical flask, then place them in an oil bath at 150° C. and stir for 1 hour at a constant temperature to obtain product. After testing, the oil absorption of the product is 83.5ml / 100g.

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Abstract

The invention discloses a method for enhancing oil absorption of calcined kaolin, which is implemented by putting calcined kaolin powder with granularity being less than or equal to 10 mu m and anhydrous calcium chloride powder with granularity being less than or equal to 10 mu m in a reaction vessel with the mass of added anhydrous calcium chloride powder being 2-5% of that of calcined kaolin powder, adequately agitating at constant temperature ranging from 80 DEG C to 300 DEG C. By using the inventive method, the oil absorption of calcined kaolin is enhanced from 69-72ml / 100g to 78.5-83.5ml / 100g, no adverse influence on physical performances of calcined kaolin such as whiteness, dispersibility, water-solubility and the like is exerted, and the method is simple and easy to implement, is low in cost and causes no pollution to the environment.

Description

technical field [0001] The invention relates to a method for increasing the oil absorption of calcined kaolin, which belongs to the field of coatings. Background technique [0002] Titanium dioxide, which is widely used in the field of high-grade coatings, is expensive, and all countries are exploring alternative products. At present, some developed countries have used kaolin to replace titanium dioxide for high-grade coatings. Kaolin used in the field of high-grade coatings generally has the characteristics of good whiteness and high oil absorption. Although the kaolin processed in my country has good whiteness, its oil absorption is generally low, and its dispersion in oil is poor, which cannot meet the requirements of the high-end coating field. As a result, my country's kaolin used in the high-end paint coating field has been dependent on imports. [0003] my country's coal series kaolin has high purity (kaolinite content > 95%), good quality, easy mining and wide d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/42C09C3/06C09D7/12
Inventor 严春杰万为敏余洪杰陈洁渝郭霞
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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