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Preparation method of super-weather-resistant titanium dioxide

A titanium dioxide and super-weather-resistant technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve problems such as high oil absorption and water absorption, poor storage stability of paint, low oil absorption or water absorption, etc. Achieve the effects of reduced oil absorption and water absorption, good storage stability, and good formula applicability

Inactive Publication Date: 2020-03-24
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the method of improving the weather resistance of titanium dioxide through a large amount of coating (based on the total mass of titanium dioxide, the coating amount is 10-30wt%), although the weather resistance of titanium dioxide can be improved, the oil absorption and The water absorption is generally high, which will affect its viscosity in downstream customer formulation systems, which in turn will affect its formulation applicability, thus limiting its application fields
The method of improving the weather resistance of titanium dioxide by doping transition metals such as US20060032402A1, in fact, a small amount of doping can not achieve the effect of improving weather resistance, and a large amount of doping is equivalent to increasing the number of coating layers of titanium dioxide, which is also very It is difficult to achieve low oil absorption or water absorption, and some color-developing metals such as cerium and tin doped will reduce the whiteness of titanium dioxide at the same time
And the method of adopting calcining such as US2671031, although can improve the weather resistance of titanium dioxide by reducing the active group on the surface of titanium dioxide, its energy consumption is higher, and because the hydroxyl group on its surface is taken off at high temperature, formed relatively The hard oxide layer will affect its grindability, that is, its dispersibility, and due to the lack of surface hydroxyl groups, it also reduces the compatibility with the resin, and the storage stability of the coating is also poor

Method used

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  • Preparation method of super-weather-resistant titanium dioxide
  • Preparation method of super-weather-resistant titanium dioxide
  • Preparation method of super-weather-resistant titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take the qualified chlorination base material, beat the slurry and dilute it to 280g / L, heat to 95℃, adjust the pH to 10.0 with sodium hydroxide solution; add 2.5wt% sodium silicate solution (with SiO 2 Calculate), add time 20min; adjust the pH of the slurry with dilute sulfuric acid to 6.0, adjust the time to 150min, after homogenizing for 30min, add 2.0wt% aluminum sulfate solution (with Al 2 O 3 Calculate), while adding sodium hydroxide solution to keep the slurry pH at 7.0 unchanged, adding time for 30 minutes, homogenizing for 30 minutes and then sanding, the sanding particle size is controlled to 0.32μm; the hydrothermal reaction is carried out at 240 ℃, the reaction The time is 3h; after cooling to 50°C, water washing (water washing conductivity 2 The total amount of TMP is 0.3wt%, and the vapor-solid ratio is 1.8.

Embodiment 2

[0033] Take the qualified chlorination method base material, beat the slurry and dilute it to 240g / L, heat it up to 80℃, adjust the pH to 11.0 with sodium hydroxide solution; add 2.0wt% sodium silicate solution (with SiO 2 Calculate), adding time 20min; adjust the pH of the slurry with dilute sulfuric acid to 6.0, adjusting time to 150min, after homogenizing for 30min, add 2.5wt% aluminum sulfate solution (with Al 2 O 3 At the same time, add sodium hydroxide solution to keep the pH of the slurry unchanged at 7.0. Add time for 30 minutes, homogenize for 30 minutes, and then sand mill. The sand mill particle size is controlled to 0.31 μm; the hydrothermal reaction is carried out at 200 ℃. The time is 5h; after cooling to 50°C, water washing (water washing conductivity 2 The total amount of TMP is 0.3wt%, and the vapor-solid ratio is 1.8.

Embodiment 3

[0035] Take the qualified chlorination base material, beat the slurry and dilute it to 200g / L, heat to 75℃, adjust the pH to 7.0 with sodium hydroxide solution; add 1.5wt% zirconium oxychloride solution (with ZrO 2 Calculate), add time 20min; adjust the pH of the slurry with sodium hydroxide solution to 8.5, adjust the time for 60min, after 30min homogenization, add 3.0wt% aluminum sulfate solution (with Al 2 O 3 At the same time, add sodium hydroxide solution to keep the pH of the slurry unchanged at 7.0. Add time for 30 minutes, homogenize for 30 minutes and then sand mill. The particle size of sand mill is controlled to 0.30 μm; the hydrothermal reaction is carried out at 120°C. The time is 8h; after cooling to 50°C, water washing (water washing conductivity 2 The total amount of TMP is 0.3wt%, and the vapor-solid ratio is 1.8.

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Abstract

The invention discloses a preparation method of super-weather-resistant titanium dioxide, which comprises the following steps: pulping a titanium dioxide base material, carrying out inorganic coating,carrying out sanding, carrying out hydrothermal reaction, washing the reaction product with water, drying the reaction product, and pulverizing the reaction product with steam to obtain the super-weather-resistant titanium dioxide. According to the preparation method of the super-weather-resistant titanium dioxide, a special surface treatment process is adopted, and a more uniform and compact film layer can be formed on the surface of the titanium dioxide with the coating amount not exceeding 6wt% of the total mass of the titanium dioxide. The product obtained by the invention not only has super weather resistance, but also has excellent dispersity and storage stability, and the formula applicability of the product in downstream customers is relatively good due to small coating amount.

Description

Technical field [0001] The invention relates to the field of titanium dioxide preparation, in particular to a method for preparing super weather-resistant titanium dioxide. Background technique [0002] Titanium dioxide is a very important white pigment, which is widely used in coatings, plastics, paper, ink and other industries. With the improvement of people’s living standards, the sensory requirements for products are getting higher and higher. For example, exterior wall coatings, automobile paints, and marine anticorrosive paints are required to be durable and always be bright and beautiful. This is the weather resistance of titanium dioxide. Sex puts forward higher requirements. [0003] To improve the weather resistance of titanium dioxide is basically to reduce the photocatalytic performance of titanium dioxide. Most of the titanium dioxide manufacturers at home and abroad usually use a large amount of silicon-aluminum coating, zirconium-aluminum coating or doping with tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/04
CPCC09C1/3607C09C1/3623C09C1/3661C09C3/041C09C3/063
Inventor 陈建立王永珊冯亚阳李瑞瑞周文静曹青喜赵丁
Owner LOMON BILLIONS GRP CO LTD
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