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Method for performing compact silicon aluminum coating on titanium dioxide

A titanium dioxide, dense technology, applied in the field of titanium dioxide, to achieve the effect of simple operation, improved weather resistance, uniform and dense coating effect

Inactive Publication Date: 2018-02-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no published patent on the preparation of silicon-aluminum coated titanium dioxide pigments from orthosilicic acid and low-basic sodium metaaluminate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. Add 150g of the primary product of titanium dioxide into deionized water, stir and beat at high speed, and control the concentration of the slurry at 300g / L (with TiO 2 ), adding 10% (mass fraction) of NaOH solution, controlling the pH value of the slurry at 9.5, and controlling the amount of sodium hydroxide added to obtain slurry a;

[0031] B, slurry a is warmed up to 90 ℃, adds the NaOH solution of ortho silicic acid and 10% (mass fraction) simultaneously, the add-on of ortho silicic acid (as SiO 2 Calculated) is the TiO in the primary product of titanium dioxide 2 3% by weight, the pH value of the slurry is controlled at 9.5, the pH controls the amount of sodium hydroxide added, the feeding time is 120min, and after the addition is completed, it is matured for 120min to obtain slurry b;

[0032] C, adjust the temperature of slurry b to 70°C, add 200g / L low-alkalinity sodium metaaluminate and 6% hydrochloric acid concurrently in slurry b, the addition of sodium ...

Embodiment 2

[0035] A. Add 150g of the primary product of titanium dioxide into deionized water, stir and beat at high speed, and control the concentration of the slurry at 300g / L (with TiO 2 ), adding 10% (mass fraction) of NaOH solution, controlling the pH value of the slurry at 9.5, and controlling the amount of sodium hydroxide added to obtain slurry a;

[0036] B. Raise the temperature of slurry a to 90°C, add orthosilicic acid, the amount of orthosilicic acid added (based on SiO 2Calculated) is the TiO in the primary product of titanium dioxide 2 3% by weight, the feeding time of orthosilicic acid is 30min; then add 10% (mass fraction) NaOH solution, the NaOH feeding time is 120min, the pH of the slurry is controlled at 9.5, and the pH controls the amount of sodium hydroxide added. Aging for 120min to obtain slurry b;

[0037] C, adjust the temperature of the slurry b to 65°C, add 200g / L low-alkalinity sodium metaaluminate and 6% hydrochloric acid in parallel in the slurry b, add t...

Embodiment 3

[0040] A. Add 150g of the primary product of titanium dioxide into deionized water, stir and beat at high speed, and control the concentration of the slurry at 300g / L (with TiO 2 ), adding 10% (mass fraction) NaOH solution, controlling the pH value of the slurry at 9.5, and controlling the amount of sodium hydroxide added to obtain slurry a;

[0041] B. Raise the temperature of slurry a to 90°C, add orthosilicic acid, the amount of orthosilicic acid added (based on SiO 2 Calculated) is the TiO in the primary product of titanium dioxide 2 3% by weight, the feeding time of orthosilicic acid is 30 minutes; then add 10% (mass fraction) NaOH solution, the feeding time is 120 minutes, control the pH of the slurry at 9.5, pH control the amount of sodium hydroxide added, and ripen after adding 120min, get slurry b;

[0042] C. Adjust the temperature of the slurry b to 80°C, add 6% hydrochloric acid to the slurry b, control the pH of the slurry at 3.0, and control the amount of hydro...

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Abstract

The invention discloses a method for performing compact silicon aluminum coating on titanium dioxide and belongs to the field of titanium dioxide. The invention aims to provide a novel method for performing compact silicon aluminum coating on the titanium dioxide. The method for performing compact silicon aluminum coating on the titanium dioxide comprises the following steps: A, pulping a titaniumdioxide primary product, controlling the pulping concentration to be 150 to 350 g / L based on TiO2, and adding inorganic alkali to control the pH value of the pulp to be 9.0 to 11.0; B, heating to 60to 90 DEG C, adding orthosilicic acid and inorganic alkali, controlling the pH value of the pulp to be 8.0 to 11.0 and ageing for 1 to 3 hours; adjusting the temperature of the pulp to be 50 to 90 DEGC, adding inorganic acid and sodium metaaluminate, or adding inorganic acid, sodium metaaluminate, aluminum sulfate and inorganic alkali, controlling the pH value of the terminal pulp to be 6.0 to 10.0, ageing for 1 to 3 hours and completing coating. According to the method, the coating effect is uniform and compact, the weather resistance of the titanium dioxide pigment is obviously improved, and a new approach is provided for titanium dioxide surface coating.

Description

technical field [0001] The invention belongs to the field of titanium dioxide, and in particular relates to a method for dense silicon-aluminum coating of titanium dioxide. Background technique [0002] Due to its semiconductor properties, titanium dioxide has strong photocatalytic activity, and can degrade organic matter in contact with it under sunlight, especially ultraviolet radiation, causing yellowing and pulverization of coatings. In order to improve the weather resistance of titanium dioxide pigments, proper surface treatment is very necessary. According to the theory that "heterogeneous nucleation" is better than "homogeneous nucleation", it is easy to 2 A hydrated silica film is deposited on the particle surface. However, since the main component of the hydrated silica film is a polymer of orthosilicic acid or metasilicic acid; this polymer has the characteristics of large molecular weight, loose structure, and fast precipitation rate, so it is necessary to unifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3661C09C3/006C09C3/063
Inventor 吕波伍良英陆平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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