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Process for preparing titanium dioxide with dispersion sensitive property and high weatherability

A titanium dioxide, high-weather-resistant technology, applied in the treatment of dyed low-molecular-weight organic compounds, fibrous fillers, etc., can solve the problems of broken aggregates, difficult to control the density of the coating layer, affecting the weather resistance and dispersibility of products, etc. Effects of weatherability and dispersibility

Inactive Publication Date: 2006-10-11
江苏镇钛化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the SiO on the surface of the product 2 The compactness of the coating layer is difficult to control, and due to the change of slurry dispersion and flocculation state caused by the change of pH value in the surface treatment process, the phenomenon of coating of titanium dioxide particle aggregates will occur, and the subsequent steam pulverization will make The aggregates are broken, resulting in incomplete coating of the particle surface and affecting the weather resistance and dispersion of the product

Method used

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  • Process for preparing titanium dioxide with dispersion sensitive property and high weatherability
  • Process for preparing titanium dioxide with dispersion sensitive property and high weatherability
  • Process for preparing titanium dioxide with dispersion sensitive property and high weatherability

Examples

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example 1

[0021] Get 700g of sulfuric acid method rutile type titanium dioxide without surface treatment, add deionized water to make a slurry with a concentration of about 700g / l, add 28ml sodium hexametaphosphate solution (concentration is based on P 2 o 5 Calculated at 50g / l, the amount added is based on TiO 2 0.2%), 0.74ml isopropanolamine (content 98%, density: 0.9650g / ml, the amount added is based on TiO 2 0.1% in total) as a dispersant, and disperse for 60 minutes at a speed of 3000 rpm on a high-speed disperser. Then add deionized water to dilute the dispersed slurry to 300g / l, take 1000ml of it, raise the temperature of the slurry to 91°C, add NaOH solution to adjust the pH value to 10, and add 60ml of sodium silicate solution within 40 minutes (The concentration of sodium silicate is based on SiO 2 Calculated at 50g / l, the amount added is based on TiO 2 1%) and dilute sulfuric acid (concentration is 10%, w / w), matured for 20 minutes after adding, cooled the slurry to a tem...

example 2

[0023] Get 700g of sulfuric acid method rutile type titanium dioxide without surface treatment, add deionized water to make a slurry with a concentration of about 700g / l, add 14ml sodium hexametaphosphate solution (concentration is based on P 2 o 5 Calculated at 50g / l, the amount added is based on TiO 2 0.1% in total), 1.48ml of isopropanolamine (content 98%, density: 0.9650g / ml, the amount added is based on TiO 2 0.2% in total) as a dispersant, and dispersed for 60 minutes at a speed of 3000 rpm on a high-speed disperser. Then the dispersed slurry is diluted to 200g / l with deionized water, 1000ml of it is taken, the temperature of the slurry is raised to 92°C, the pH value of the slurry is adjusted to 11, and within 50 minutes, 40ml of sodium silicate ( The concentration of sodium silicate is SiO 2 Calculated at 50g / l, the amount added is based on TiO 2 1%) and dilute sulfuric acid (concentration is 10%, w / w), matured for 20 minutes after adding, cooled the slurry to a te...

example 3

[0025] Get 700g of sulfuric acid method rutile type titanium dioxide without surface treatment, add deionized water to make a slurry with a concentration of about 700g / l, add 28ml sodium hexametaphosphate solution (concentration is based on P 2 o 5 Calculated at 50g / l, the amount added is based on TiO 2 0.2%), 0.77ml triethanolamine (content 80%, density: 1.140g / ml, the amount added is based on TiO 2 0.1% in total) as a dispersant, and dispersed for 60 minutes at a speed of 3000 rpm on a high-speed disperser. Then add deionized water to dilute the dispersed slurry to 250g / l, take 1000ml of it, raise the temperature of the slurry to 92°C, add NaOH solution to adjust the pH value to 10, and add 50ml of sodium silicate solution within 40 minutes (The concentration of sodium silicate is based on SiO 2 Calculated at 50g / l, the amount added is based on TiO 21%) and dilute sulfuric acid (concentration is 10%, w / w), matured for 20 minutes after adding, cooled the slurry to a tempe...

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Abstract

The invention relates to a method for preparation of titanic anhydride which is easy to disperse and is of high weatherability. The method consists of selecting 0.1 %-0.5 % hexametaphosphate, 0.1 %-0.3 % isopropanolamine or triethanolamine as disperser, dispersing the titanic anhydride paste and adjusting the PH value of the sodium-hydroxide solution to 10-11, adding silicate of soda solution and dilute sulphuric acid to cover silica dioxide at 91-95 DEG C, in which the added quantity of the soda solution is 1 %-6 % of the silica dioxide, then adjusting the PH value to 6.5-8.5, adding aluminum sulfate solution and sodium-hydroxide solution, in which the added quantity of the aluminum sulfate is 2 %-3.5 % of the aluminum oxide,maturing for 10 min to cover the aluminum oxide, rinshing and drying, then adding some organosilicon additive, performing comminution by gas stream to obtain the said titanic anhydride which is easy to disperse and is of high weatherability. The advantages of this invention lie in that it can effectively guarantee the dispersion of the paste before mat-forming treatment, can carry out the coating of the inorganic mat-forming treatment in single grain surface of titanic anhydride, and can reach the attempt of improving the weatherability and the dispersibility of titanic anhydride.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide with good dispersibility and high weather resistance, in particular, coating the surface of titanium dioxide with silicon and aluminum, and simultaneously using organic matter to prepare titanium dioxide with good dispersibility and high weather resistance in organic media. . Background technique [0002] Titanium dioxide is a white pigment with excellent performance, which can be widely used in the fields of coatings, plastics, papermaking, inks, catalysts and high-end cosmetics. However, titanium dioxide has strong photochemical activity, which can easily cause bond breakage and degradation of organic medium molecules in the application system, resulting in chalking, loss of light, discoloration and other phenomena. In addition, titanium dioxide itself is hydrophilic, and its pigment performance is limited. Full performance also depends on how well it is dispersed in organic media. ...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/08
Inventor 姚恒平刘俊王玲邱健亭奉辉
Owner 江苏镇钛化工有限公司
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