Application of Calcined Kaolin and Titanium Dioxide Composition in Coatings

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: 2017-06-16
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
[0005] 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 Composition in Coatings
  • Application of Calcined Kaolin and Titanium Dioxide Composition in Coatings
  • Application of Calcined Kaolin and Titanium Dioxide Composition in Coatings

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0026] Take industrial titanium dioxide with different particle size distributions as fillers to prepare finished coatings, and test the relevant indexes of the coatings. The other parameters in the process are taken as intermediate values.

[0027] Table 1 The influence of different particle diameters of titanium dioxide on coating performance

[0028]

[0029] Note: The relevant measurement methods in the present invention are all determined according to the following methods:

[0030] Test the hiding power of paint according to GB / T 1726-1979 standard;

[0031] Detect the whiteness of paint according to GB / T 5950-2008 standard;

[0032] Determination of the dispersion stability of the coating: Take 50ml of the coating and pour it into a graduated test tube with a stopper and let it stand. After 48 hours, read the volume V of the supernatant, then the dispersion stability of the coating = (50-V) / 50, where the larger the value It means that the dispersion stability of the coating is b...

experiment example 2

[0035] Take industrial calcined kaolin with different particle size distributions, and take intermediate values ​​of other parameters in the process, prepare coatings and carry out relevant tests. The results are shown in Table 2.

[0036] Table 2 The influence of calcined kaolin with different particle size on coating performance

[0037]

[0038] It can be seen from Table 2 that when the median particle size of calcined kaolin exceeds 5μm, 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 selection of the present invention Bit particle size meets 0.1um≤D 50 Kaolin Calcined kaolin ≤5um was used as the experimental raw material.

experiment example 3

[0040] Take industrial titanium dioxide with a median particle size of 1μm and industrial calcined kaolin with a median particle size of 1μm, and mix different mass ratios of calcined kaolin and titanium dioxide to obtain compositions with different numbers to make coatings and test the key Index, other parameters in the process take the middle value.

[0041] Table 3 The effect of different mass ratios of titanium dioxide and calcined kaolin on coating properties

[0042]

[0043]

[0044] As shown in Table 3, as the addition of calcined kaolin increases, the whiteness and hiding power of the coating will decrease significantly. When the addition of calcined kaolin exceeds 40%, the whiteness and hiding power of the coating will be significantly reduced, which cannot be satisfied. 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 specifically relates to a composite titanium dioxide, the coating prepared by using it as a filler has high dispersibility and high rheology. Background technique [0002] The scientific name of titanium dioxide is titanium dioxide, which is considered to be the best white pigment in the world. It is widely used in coatings, plastics, papermaking, printing inks, chemical fiber, rubber, cosmetics and other industries. In particular, the paint industry is the largest user of titanium dioxide. Paints made of titanium dioxide have bright colors, high hiding power and strong tinting power. However, due to the limitation of the resources of titanium dioxide, titanium dioxide resources are becoming increasingly scarce and the price is higher. The production cost is higher. [0003] Kaolin is also called kaolin clay, the main component is Al 4 (Si 4 O 10 )(OH) 8 . [0004] In order to solve the high cost, the market...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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