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Preparation method of titanium dioxide pigment with high covering power, weather resistance and whiteness

A technology of titanium dioxide and hiding power, which is applied in the field of preparation of high-whiteness titanium dioxide pigments, which can solve the problems of adverse effects on product whiteness and sacrifice of product weather resistance, and achieve excellent filtration performance, good hiding power and weather resistance, and weather resistance excellent effect

Active Publication Date: 2017-03-15
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a lot of experimental research, it is found that titanium dioxide coated with hydrated silica and alumina surface can indeed improve the hiding power of the product, but it will have an adverse effect on the whiteness of the product. The acid hydrated silica coated product is used Although the whiteness index has been improved, the weather resistance of the product has been sacrificed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a concentration of 20wt%, and use a pH meter to detect the pH value of the slurry during the entire coating process, and adjust it with sodium hydroxide solution Slurry pH to 8.5, add sodium silicate solution, the concentration of sodium silicate solution is SiO 2 Calculated as 100g / L, the amount of sodium silicate solution added is calculated as SiO in sodium silicate 2 accounted for TiO 2 0.2% by weight, disperse for 20 minutes; then grind so that the average particle size of the slurry is 300nm, the particle size distribution is calculated by number, and the proportion exceeding 500nm is 8%, and the grinding medium is removed from the slurry;

[0025] 1.2. Heat the ground slurry to 50°C, and maintain this temperature throughout the coating process;

[0026] 1.3. Add 2.0% at one time (based on SiO in sodium silicate 2 accou...

Embodiment 2

[0031] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a concentration of 30%, use a pH meter to detect the pH value of the slurry during the entire coating process, and adjust it with potassium hydroxide solution Slurry pH to 10.5, add potassium silicate solution, the concentration of potassium silicate solution is SiO 2 Calculated as 200g / L, the amount of potassium silicate solution added is calculated as SiO in potassium silicate 2 accounted for TiO 20.5% by weight, disperse for 40 minutes; then grind, so that the average particle size of the slurry is 450nm, the particle size distribution is calculated by number, and the proportion exceeding 500nm is 9%, and the grinding medium is removed from the water slurry;

[0032] 1.2. Heat the ground slurry to 70°C, and maintain this temperature throughout the coating process;

[0033] 1.3, add 4.0% at one time (as SiO 2 accounted for ...

Embodiment 3

[0038] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a concentration of 25%, use a pH meter to detect the pH value of the slurry during the entire coating process, and adjust it with potassium hydroxide solution Slurry pH to 9.5, add sodium silicate solution, the concentration of sodium silicate solution is SiO 2 Calculated as 150g / L, the amount of sodium silicate solution added is 0.3% based on the weight of silicon dioxide in sodium silicate in the initial product of titanium dioxide, and dispersed for 30 minutes; then it is ground to make the average particle size of the slurry is 250nm, and the particle size distribution is uniform. 8.5% by quantity over 500nm, removal of grinding media from aqueous slurry;

[0039] 1.2. Heat the ground slurry to 60°C, and maintain this temperature throughout the coating process;

[0040] 1.3, add 3.5% at one time (as SiO 2 accounted for TiO...

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Abstract

The invention provides a preparation method of a titanium dioxide pigment with high covering power, weather resistance and whiteness. The preparation method includes: adopting a titanium dioxide primary product, beating in water to prepare slurry, adding water-soluble silicate solution as a dispersant, and performing curing prior to grinding treatment; heating up the slurry, adding in the water-soluble silicate solution, adopting mineral acid to regulate pH value, and performing curing prior to forming a dense, hydrated and unformed silica membrane; adding the water-soluble silicate solution again, maintaining the pH value of the slurry with an acidic aluminium compound, and performing curing prior to forming a loose and porous membrane layer taking aluminium hydrosilicate as a main ingredient so as to assure high covering power and whiteness; wrapping the loose hydrated alumina membrane to assure excellent dispersibility; performing filtration washing, drying, gasification and pulverization, and recovering with a bag filter to obtain the finished product. The preparation method has the advantages that the titanium dioxide pigment prepared with the method has high weather resistance and whiteness besides excellet covering power, is high in production cost, and can be widely applied to the fields of flat and matt building coatings, printing ink and the like with requirements on high dry covering power.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide pigment with high hiding power, high weather resistance and high whiteness in the field of chemical industry. Background technique [0002] Titanium dioxide is one of the most important fine chemical raw materials. It has become the most widely used white pigment due to its high refractive index, high color reduction and hiding power, and is known as the "king of white pigments". It is widely used in industrial production such as coatings, plastics, paper, rubber, and chemical fibers. Among them, the coating industry uses the largest amount of titanium dioxide, accounting for more than 60% of the total. Titanium dioxide pigment is an important part of coatings. Its purpose is to cover and impart color and durability to the coating. The quality of coatings is very important Much depends on the quality of the pigment. As a kind of water-based paint, architectural latex paint has the ch...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/04C09C3/06C09D7/12
CPCC01P2006/65C01P2006/90C09C1/3607C09C1/3623C09C1/3661C09C3/006C09C3/041C09C3/063C09D7/62
Inventor 臧颖波姜志刚王建伟李俊强刘立新付岩李冬旭马玉杰李东丹任健穆宇同吴琼
Owner 中信钛业股份有限公司
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