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Simple method for improving oil absorption value of calcined kaolin

A technology of calcining kaolin and oil absorption value, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of unfavorable preparation of coatings, high viscosity, high equipment requirements, etc., and achieve simple process, low cost, and equipment requirements low effect

Inactive Publication Date: 2012-07-25
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can increase the oil absorption value of calcined kaolin, but it also requires high equipment, and the product has a high viscosity after mixing with water, which is not conducive to the preparation of coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 20 g of calcined kaolin powder (particle size ≤ 50 μm) into the conical flask, stir for -3 to -5 minutes, then weigh 0.1 g of sodium sulfide crystal particles (particle size ≥ 40 mesh) into the conical flask, and stir for 7 ~ Stir for 10 minutes until uniform, then transfer to a crucible, and bake in an oven at 150°C for 1 hour to obtain calcined kaolin with higher oil absorption value. After testing, its oil absorption value is 88.75ml / 100g.

Embodiment 2

[0025] Weigh 20 g of calcined kaolin powder (particle size ≤ 50 μm) into a conical flask, stir for -3 to -5 minutes, then weigh 0.2 g of sodium sulfide crystal particles (particle size ≥ 40 mesh) into the conical flask, and stir for 7 ~ Stir for 10 minutes until uniform, then transfer to a crucible, and bake in an oven at 150°C for 1 hour to obtain calcined kaolin with higher oil absorption value. After testing, its oil absorption value is 93.74ml / 100g.

Embodiment 3

[0027] Weigh 20 g of calcined kaolin powder (particle size ≤ 50 μm) into the conical flask, stir for -3 to -5 minutes, then weigh 0.3 g of sodium sulfide crystal particles (particle size ≥ 40 mesh) into the conical flask, and stir for 7 ~ Stir for 10 minutes until uniform, then transfer to a crucible and bake in an oven at 150°C for 1 hour to obtain calcined kaolin with higher oil absorption value. After testing, its oil absorption value is 96.00ml / 100g.

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PUM

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Abstract

The invention relates to a simple method for improving an oil absorption value of calcined kaolin. The simple method is characterized by comprising the following steps: stirring the calcined kaolin at room temperature; then adding sodium sulfide crystal particles, wherein the addition of the sodium sulfide crystal particles is 0.5wt%-4.0wt% of the calcined kaolin; and evenly stirring at room temperature, baking at the temperature of 25-150 DEG C, and then cooling so as to obtain the product. By using the method, the oil absorption value of the calcined kaolin is increased from 65-70ml / 100g to72.50-102.00ml / 100g; and the method has the advantages of simple and convenient process, low cost, low requirement on equipment and suitability for industrial production.

Description

technical field [0001] The invention relates to a simple method for increasing the oil absorption value of calcined kaolin. Background technique [0002] my country has become the world's second largest paint producer and consumer, and has entered the mainstream of the world's paint industry. Calcined kaolin is widely used as paint filler. Calcined kaolin with high oil absorption value is often needed in the preparation of high-grade coatings. The oil absorption value of unmodified calcined kaolin in my country is generally between 55ml / 100g and 70ml / 100g, and the oil absorption value of calcined kaolin in the United States is relatively high, generally 90ml / 100g Between 120ml / 100g, but it is expensive. Therefore, due to the performance gap, most of the calcined kaolin used in the field of high-grade coatings in my country has been dependent on imports. Accordingly, in order to make full use of our country's high-quality and cheap kaolin resources, we have carried out rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/42C09C3/06C09D7/12
Inventor 陈涛严春杰马睿郭霞仇秀梅
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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