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Red schorl type titanium dioxide coating method and preparation of used reagent

A titanium dioxide, rutile type technology, applied in the direction of dyeing low molecular organic compounds, fibrous fillers, etc., can solve the problems of yellowing, powder coating film, reduce product performance and service life, etc., to improve whiteness, improve weather resistance and other problems properties, improve gloss

Inactive Publication Date: 2009-06-24
HENGYANG TIANYOU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This lattice defect of titanium dioxide makes it have many photoactive points on the surface. During use, due to the irradiation of sunlight, these photoactive points are excited to catalyze and degrade the organic components in contact with it, which eventually leads to powdering of the coating film. , loss of light, yellowing, discoloration, seriously reduce the various performance and service life of the product
[0008] The properties of titanium dioxide products produced by the above methods are quite different, and the product properties are single. During the production process, acid (sulfuric acid) and alkali (sodium hydroxide) are repeatedly used to adjust the pH value of the slurry, thereby reducing the processing capacity of the equipment and other defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The rutile type titanium dioxide coating method of the present invention, it adopts following steps to carry out successively:

[0030](1) Add rutile titanium dioxide powder to the aqueous solution containing dispersant ethylene glycol grafted modified simethicone oil, which contains 400 g / L of titanium dioxide powder and 1 ml / L of dispersant in the aqueous solution; adjust the pH value at 11 , stirring and sand milling until the particle size of titanium dioxide is 0.20 μm;

[0031] (2) Stirring step (1) Sand mill the obtained slurry, add water to dilute the content of titanium dioxide in the slurry to 300g / L, and maintain the temperature of the slurry at 40°C; then add zirconium salt to the slurry, adding 1g Zr(SO 4 ) 2 At this time, the pH of the slurry is 1.5; then stir and mature at 40°C for 60 minutes;

[0032] (3) Add sodium aluminate to the slurry obtained in step (2), add 1 g of aluminate per liter of slurry, and then the pH of the slurry is 3.5; then stir a...

Embodiment 2

[0040] The rutile type titanium dioxide coating method of the present invention, it adopts following steps to carry out successively:

[0041] (1) Add the rutile titanium dioxide powder to the aqueous solution containing the dispersant ethylene glycol grafted modified simethicone oil, which contains 800 g / L of titanium dioxide powder and 10 ml / L of the dispersant in the aqueous solution; adjust the pH value at 12 , stirring and sand milling until the titanium dioxide particle size is 0.20-0.30 μm; the particle size of the rutile titanium dioxide powder is 45 μm standard sieve residue≤0.5%, and the titanium dioxide content is≥98% (weight).

[0042] (2) Stirring step (1) Sand mill the obtained slurry, add water to dilute the content of titanium dioxide in the slurry to 400g / L, and maintain the temperature of the slurry at 45°C; then add zirconium salt to the slurry, adding 15g ZrCl 4 At this time, the pH of the slurry is 2.5; then stir and mature at 45°C for 70 minutes;

[004...

Embodiment 3

[0050] The rutile type titanium dioxide coating method of the present invention, it adopts following steps to carry out successively:

[0051] (1) Add rutile titanium dioxide powder to the aqueous solution containing dispersant ethylene glycol grafted modified simethicone oil, which contains 600g / L of titanium dioxide powder and 5ml / L of dispersant in the aqueous solution; adjust the pH value at 12 , stirring and sand milling until the titanium dioxide particle size is 0.30 μm; the particle size of the rutile titanium dioxide powder is 45 μm standard sieve residue ≤ 0.5%, titanium dioxide content ≥ 98% (weight).

[0052] (2) Stirring step (1) Sand mill the obtained slurry, add water to dilute the content of titanium dioxide in the slurry to 350g / L, and maintain the temperature of the slurry at 40°C; then add zirconium salt to the slurry, adding 8g ZrOCl 2 At this time, the pH of the slurry is 2.5; then stir and mature at 40°C for 70 minutes;

[0053] (3) Add sodium aluminate...

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Abstract

The invention relates to a rutile type titanium dioxide coating method and a preparation method of reagent used thereby. A layer of ZrO2 is firstly coated on a TiO2 particle, thus improving the white content, lustrousness and weather resistance of the product; four layers of pellumina are coated in batches to further improve the performances such as weather resistance, dispersivity (dry powder fluidness), hiding power, lustrousness and the like of the product; finally, the main function of organic coating is to improve the dry powder fluidness of the product and the dispersivity in the application media; meanwhile, the lustrousness of the product is improved, and the aggregation resistant performance of the product in storage and transportation can be enhanced. Sodium aluminate or aluminium sulphate is added at the different stages of the coating process, so that the pH value the sizing agent can be regulated by utilizing the different pH values of the two aluminates, and the complicated operation that the pH value the sizing agent is regulated after coating agent is added every time is omitted. The titanium dioxide which coated and finally obtained has the advantages of high lustrousness, dispersivity, dry powder fluidness and weather resistance.

Description

technical field [0001] The invention relates to a production method of titanium dioxide powder, in particular to a rutile-type titanium dioxide coating method and a preparation method of the reagent used. Background technique [0002] Titanium dioxide has become the best white pigment because of its high refractive index, strong decolorizing power, good gloss and whiteness, and is widely used in the fields of coatings, plastics, papermaking, inks and chemical fibers. [0003] At present, the preparation of crude rutile titanium dioxide powder (titanium dioxide content in the powder ≥ 98%) is a common technology in China, mainly divided into sulfuric acid method and chloride method. [0004] However, the crystal formation stage of rutile titanium dioxide will produce oxygen defects on the crystal lattice, which is the so-called Schottky defect. This lattice defect of titanium dioxide makes it have many photoactive points on the surface. During use, due to the irradiation of ...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/08
Inventor 胡飞跃刘平
Owner HENGYANG TIANYOU CHEM
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