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Surface modified titanium dioxide particles and preparation method thereof

A technology of surface modification and titanium dioxide, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of titanium dioxide agglomeration and low quality of titanium dioxide, and improve whiteness, weather resistance and cost Low cost, simple and easy method

Inactive Publication Date: 2013-02-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems that titanium dioxide is easy to agglomerate due to polar adsorption or moisture absorption, and the quality of the coated titanium dioxide is not high, the present invention provides a surface-modified titanium dioxide particle and a preparation method thereof, specifically in titanium dioxide The surface is coated with a layer of inorganic substances to improve the dispersibility, weather resistance and whiteness of titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh the titanium dioxide powder, add water to form a suspension with a concentration of 5wt%, add sodium hexametaphosphate of 0.1% of the mass of the titanium dioxide powder, adjust the pH to 11 with a NaOH solution with a mass concentration of 10%, and then Stir for two hours to obtain a titanium dioxide slurry;

[0020] (2) Add sodium silicate to the titanium dioxide slurry obtained in step (1) to maintain the concentration of alkali metal ions at 0.2mol / L, and use 10% H 2 SO 4 The pH value of the solution is adjusted to be 9, and the slurry is allowed to stand for 30 minutes, so that silicon is precipitated on the surface of the titanium dioxide powder particle in the form of silicon oxide, wherein the addition of the water-soluble silicon compound (in terms of SiO 2 Calculated) is 5% of the mass of titanium dioxide powder to obtain a mixed slurry;

[0021] (3) The coating agent, aluminum sulfate, was formulated to 70g / L (as Al 2 o 3 ) solution, and then ad...

Embodiment 2

[0025] (1) Weigh the titanium dioxide powder, add water to make a suspension with a concentration of 15wt%, add 0.2% sodium hexametaphosphate of the mass of the titanium dioxide powder, adjust the pH to 10 with KOH with a mass concentration of 10%, and then stir Two hours, obtain titanium dioxide slurry;

[0026] (2) Add potassium silicate to the titanium dioxide slurry obtained in step (1) to maintain the alkali metal ion concentration at 0.3 mol / L, adjust the pH value to 8 with HCl with a mass concentration of 10%, and let the slurry stand Feed for 50 minutes to make silicon precipitate on the surface of titanium dioxide powder particles in the form of silicon oxide, wherein the amount of water-soluble silicon compound (in terms of SiO 2 Calculated) is 10% of the mass of titanium dioxide powder to obtain a mixed slurry;

[0027] (3) The coating agent, aluminum sulfate, was formulated to 150g / L (as Al 2 o 3 ) solution, and then added to the mixed slurry obtained in step (2...

Embodiment 3

[0031] (1) Weigh the titanium dioxide powder, add water to make a suspension with a concentration of 30wt%, add 0.05% sodium hexametaphosphate to the mass of the titanium dioxide powder, adjust the pH to 9 with NaOH with a mass concentration of 10%, and then stir Two hours, obtain titanium dioxide slurry;

[0032] (2) Add sodium silicate and calcium silicate to the titanium dioxide slurry obtained in step (1) to maintain the concentration of alkali metal ions at 0.1mol / L, and use 10% H 2 SO 4 Adjust the pH value to 9, and let the slurry stand for 60 minutes, so that silicon is precipitated on the surface of the titanium dioxide powder particles in the form of silicon oxide, wherein the addition of the water-soluble silicon compound (in terms of SiO 2 Calculated) is 1% of the mass of titanium dioxide powder to obtain a mixed slurry;

[0033] (3) The coating agent, aluminum sulfate, was prepared at 1% of the mass of titanium dioxide powder to 40g / L (as Al 2 o 3 ) solution, a...

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Abstract

The invention provides surface modified titanium dioxide particles and a preparation method thereof. The surfaces of the titanium dioxide particles are coated with a compact inorganic coating layer, the particle size is 0.5-5mum, and the titanium dioxide particles are spherical particles. Water is added into titanium dioxide to prepare suspension liquid, sodium hexametaphosphate is added into the suspension liquid and stirred for two hours, a water-soluble silicon compound is added, and slurry standing is performed to obtain mixed slurry. A membrane forming agent aluminum sulfate prepared solution is added into the mixed slurry of 80-100 DEG C, and inorganic base is added into the mixed slurry to enable the slurry to be stirred evenly, then inorganic acid is added to adjust the mixed slurry to be neutral, and the stirring is kept to enable aluminum salt to be fully hydrolyzed. The inorganic acid is added to adjust potential of hydrogen (pH), then lanthanum oxide is slowly added to perform curing, suction filtration and washing are performed after re-curing, and filter cakes are dried and grinded to obtain the surface modified titanium dioxide particles. The preparation method reduces the titanium dioxide surface activity, increase titanium dioxide dispersibility, improves whiteness and weather resistance of titanium dioxide, and is simple and easy to operate, low in cost and free of pollution.

Description

technical field [0001] The invention relates to a surface-modified titanium dioxide particle and a preparation method thereof, belonging to the technical field of material modification. Background technique [0002] Titanium dioxide is widely used in pigments (paints, rubber, plastics, paper, etc.), photocatalysts, photoelectric cells, and ultraviolet shielding due to its stable chemical properties, good whiteness, tinting strength and hiding power, and good heat resistance. medicines and other fields. The surface of titanium dioxide without surface treatment is generally covered by polar groups (such as -OH), so titanium dioxide is easy to agglomerate due to polar adsorption or moisture absorption, and it is difficult to disperse in other systems. Therefore, it is very important to coat titanium dioxide. With the rapid development of the national economy, the demand for titanium dioxide is also rising. Although my country's titanium dioxide production capacity is large, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
Inventor 严继康张松林王韫甘国友袁君贾瑞娇杜景红张家敏刘意春易健宏
Owner KUNMING UNIV OF SCI & TECH
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