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Method for inorganic, organic modified surface of white titanium pigment

A titanium dioxide, inorganic technology, applied in inorganic pigment processing, chemical instruments and methods, dyeing high molecular organic compound processing and other directions, can solve the problems of time-consuming, expensive alkoxysilane, expensive collection and processing, etc., to achieve convenient production, Low cost and simple operation

Inactive Publication Date: 2007-07-25
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned organic treatment agents basically use alkoxysilanes. The disadvantage is that they produce volatile organic compounds (VOC), such as methanol or ethanol. The collection and treatment of these organic substances are expensive and time-consuming
Furthermore, alkoxysilanes are also relatively expensive organic compounds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dilute TiO with water 2 The concentration is 20wt% slurry, press P in the slurry 2 o 5 with TiO 2 The weight ratio of 0.1:100 was added (NaPO 3 ) 6 Solution, use NaOH solution to adjust pH=9, disperse at high speed for 30min, raise the temperature of the slurry to 70°C, use NaOH to adjust the pH value of the solution to 10, according to the weight ratio Si:TiO 2 =1:100 add NaSiO 3 Solution and HCl, keep the pH value at 8.5, stir and mature for 30min, adjust the pH value with HCl to 8, stir and mature for 30min, while the temperature drops to 60°C, add Al and TiO 2 NaAlO with a weight ratio of 1.5:100 2 Solution and HCl, maintain the pH value of the previous step at 8.5, continue to stir for 40 minutes, adjust the pH of the solution to 6 with HCl, continue to stir for 15 minutes, filter with suction, and wash with water.

[0021] The aluminum-silicon double-coated titanium dioxide is formulated into a slurry (I) with a concentration of 20 wt%, and its pH value is ...

Embodiment 2

[0023] Dilute TiO with water 2 The concentration is 50wt% slurry, press P in the slurry 2 o 5 with TiO 2 The weight ratio of 0.5:100 was added (NaPO 3 ) 6 Solution, use KOH solution to adjust pH=10.7, disperse at high speed for 60min, raise the temperature of the slurry to 80°C, use KOH to adjust the pH value of the solution to 11, according to the weight ratio Si:TiO 2 =4:100 add NaSiO 3 Solution and HCl, keep the pH value at 10.0, stir and mature for 60min, adjust the pH value with HCl to 9, stir and mature for 60min, while the temperature drops to 70°C, add Al and TiO 2 NaAlO with a weight ratio of 4:100 2 Solution and HCl, maintain the pH value of the previous step at 9, continue stirring for 80 min, adjust the pH of the solution to 7 with HCl, continue stirring for 30 min, filter with suction, and wash with water.

[0024] The aluminum-silicon double-coated titanium dioxide is formulated into a slurry (I) with a concentration of 50 wt%, and its pH value is adjusted...

Embodiment 3

[0026] Dilute TiO with water 2 The concentration is 30wt% slurry, press P in the slurry 2 o 5 with TiO 2 The weight ratio of 0.2:100 was added (NaPO 3 ) 6 Solution, use NaOH solution to adjust pH=9.5, disperse at high speed for 45min, raise the temperature of the slurry to 80°C, use NaOH to adjust the pH value of the solution to 10.2, according to the weight ratio Si:TiO 2 =1.5:100 Add NaSiO 3 solution and H 2 SO 4 , keep the pH value at 9, stir and ripen for 30min, use H 2 SO 4 Adjust the pH value to 8, stir and mature for 40min, while the temperature drops to 65°C, add Al and TiO 2 NaAlO with a weight ratio of 2:100 2 solution and H 2 SO 4 , maintain the pH value of the previous step at 8, continue stirring for 45 minutes, adjust the pH of the solution to 6.2 with HCl, continue stirring for 20 minutes, filter with suction, and wash with water.

[0027]The aluminum-silicon double-coated titanium dioxide is formulated into a slurry (I) with a concentration of 30 w...

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Abstract

This invention relates to a method for inorganic-organic surface coating of titanium dioxide powder. The method comprises: coating the surface of titanium dioxide powder with a layer of aluminum and a layer of silicon to improve the weathering resistance, whiteness and water dispersibility of titanium dioxide powder, and reacting with hydrogen-containing methyl silicone oil and hexamethyl disilazane to form a special surface film layer, which can improve the dispersibility of titanium dioxide powder in alkyd resin. The method has such advantages as easy operation, mild reaction conditions, no secondary pollution.

Description

technical field [0001] The invention belongs to a method for modifying titanium dioxide, specifically a method for organically wrapping titanium dioxide on the basis of inorganic modification, so as to improve its dispersibility in oil. technical background [0002] Titanium dioxide has high chemical stability, heat resistance, good whiteness, tinting power and hiding power, and is used in white pigments (industrial and civil coatings, plastics, printing inks, rubber, paper, ceramics and synthetic fibers), photocatalysts , photoelectric cells, ultraviolet shielding agents and other fields have broad application prospects. For titanium dioxide without surface treatment, its surface is generally covered by polar groups (such as -OH), so titanium dioxide is easy to agglomerate due to polar adsorption or moisture absorption. It is used in plastics, paints or other non- In a polar system, it is difficult to disperse evenly in the system. In order to improve the dispersion perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/10
Inventor 徐耀王俊刚吴东孙予罕章斌
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI