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Application of calcined kaolin and titanium dioxide in paints

A technology for calcining kaolin and titanium dioxide, applied in the direction of coating, can solve the problems of low whiteness, poor dispersibility, poor covering ability, etc., and achieve the effects of large specific surface area, good rheology, and good workability

Active Publication Date: 2017-01-11
中钛集团焦作市裕盛钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite titanium dioxide is prepared by wet ball milling, and the hiding power of the prepared composite titanium dioxide is improved, but its whiteness is low, and its dispersion is poor. It is easy to settle for a long time, affecting the quality of the product, and its rheology is low. It is not conducive to the manufacture and use of coating film
[0004] Chinese patent CN 105524494A provides a titanium dioxide-coated composite titanium dioxide material, the composite titanium dioxide material includes titanium dioxide and mineral powder, wherein the mineral powder is used as the matrix, and the outer surface is covered with titanium dioxide, so that the titanium dioxide The price of titanium dioxide is greatly reduced, and it can be used as an appropriate substitute for titanium dioxide. However, the composite titanium dioxide prepared above still has the disadvantages of poor dispersion in water-based coatings, narrow application range, poor hiding power, and low rheology.

Method used

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  • Application of calcined kaolin and titanium dioxide in paints
  • Application of calcined kaolin and titanium dioxide in paints
  • Application of calcined kaolin and titanium dioxide in paints

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0025] Industrial titanium dioxide with different particle size distribution was used as filler to prepare finished coatings, and relevant indicators of coatings were tested, and other parameters in the process were taken as intermediate values.

[0026] Table 1 Effect of titanium dioxide with different particle sizes on coating properties

[0027]

[0028] Note: relevant assay methods in the present invention are all measured according to the following methods:

[0029] According to the GB / T 1726-1979 standard to test the hiding power of the paint;

[0030] Test the whiteness of paint according to GB / T 5950-2008 standard;

[0031] Determination of the dispersion stability of the coating: take 50ml of the coating and pour it into a stoppered scale test tube and let it stand, read the volume V of the supernatant after 48 hours, then the dispersion stability of the coating = (50-V) / 50, where the larger the value Indicates that the dispersion stability of the paint is better...

experiment example 2

[0034] Industrial calcined kaolin with different particle size distributions was taken, and other parameters in the process were taken as intermediate values, and coatings were prepared and related tests were carried out. The results are shown in Table 2.

[0035] Table 2 Effects of calcined kaolin with different particle sizes on coating properties

[0036]

[0037] It can be seen from Table 2 that when the median particle size of calcined kaolin exceeds 5 μm, its dispersion in the coating is poor, and its dispersion is unstable, and when it is less than 0.1um, it is easy to agglomerate and the dispersibility is not good. Therefore, the present invention chooses Particle size satisfies 0.1um≤D 50高岭土 Calcined kaolin ≤5um was used as the experimental raw material.

experiment example 3

[0039] Take industrial titanium dioxide with a median particle size of 1 μm and industrial calcined kaolin with a median particle size of 1 μm, and obtain different numbers of compositions by mixing calcined kaolin and titanium dioxide with different mass ratios, and make coatings and test their key Index, other parameters in the process take intermediate values.

[0040] Table 3 Effect of different mass ratios of titanium dioxide and calcined kaolin on coating properties

[0041]

[0042] As shown in Table 3, as the amount of calcined kaolin increased, the whiteness and hiding power of the paint decreased significantly. When the amount of calcined kaolin added exceeded 40%, the whiteness and hiding power of the paint decreased significantly, which could not meet the requirements. Therefore, in the present invention, the mass ratio of titanium dioxide to calcined kaolin is 60%-95%: 40%-5%.

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Abstract

The invention provides a paint-oriented composite titanium dioxide which comprises titanium dioxide and calcined kaolin. The weight ratio between the titanium dioxide and calcine kaolin is 60%-95%:40%-5%; the average particle size of the titanium dioxide satisfies: 0.1Mum<=D50 titanium dioxide<=5Mum. The average particle size of the calcine kaolin satisfies: 0.1Mum<=D50 calcine kaolin<=5Mum. Besides the absolute value DeltaD of the difference between D50 titanium dioxide and D50 calcine kaolin satisfies: DeltaD<=2Mum. The composite titanium dioxide provided by the invention can be applied in paints, achieve a better dispersion and better stability of paint liquid, improves the application performance of the paints. Further the titanium dioxide enjoys a high fluidity in the paints which can facilitate the average distribution of the paints and offers better workable characteristics.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a composite titanium dioxide, which is used as a filler to prepare a coating with high dispersibility and high rheology. Background technique [0002] Titanium dioxide, scientifically known as titanium dioxide, is considered to be a white pigment with the best performance in the world. It is widely used in coatings, plastics, papermaking, printing ink, chemical fiber, rubber, cosmetics and other industries. Especially the paint industry is the largest user of titanium dioxide. The paint made of titanium dioxide has bright colors, high covering ability and strong tinting power. Production costs are higher. [0003] In order to solve the high cost, lithopone, calcium sulfate and other products are used to replace titanium dioxide on the market, but the comprehensive performance is far inferior to titanium dioxide. Among them, Chinese patent CN 102031023A provides a preparation...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D201/00
CPCC09D201/00C08L91/06C08K3/346C08K2003/2241
Inventor 徐春长
Owner 中钛集团焦作市裕盛钛业有限公司
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