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Preparation method of high-weather-resistance titanium dioxide

A titanium dioxide and weather-resistant technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of no way to guarantee the compactness of the film layer, large oil absorption or water absorption, and reduced resin compatibility. , to achieve the effects of good formula applicability, improved production efficiency, and small coating amount

Pending Publication Date: 2020-04-17
LOMON BILLIONS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the weather resistance of titanium dioxide can be improved through a large number of coating methods, there is no way to guarantee the compactness of the film layer, resulting in a large oil absorption or water absorption. It is only suitable for high PVC pigment systems, which limits its use. Application field
And through high-temperature calcination, such as the patent No. US2671031, although the weather resistance of titanium dioxide can be improved by reducing the active groups on the surface of titanium dioxide, after high-temperature calcination, titanium dioxide will be sintered, and subsequent Sanding is also required, which requires high energy consumption, and because the hydroxyl groups on the surface are removed at high temperatures, a hard oxide layer is formed, which will affect its grindability, and due to the lack of surface hydroxyl groups, it also reduces Compatibility with some resins affects its field of application

Method used

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  • Preparation method of high-weather-resistance titanium dioxide
  • Preparation method of high-weather-resistance titanium dioxide
  • Preparation method of high-weather-resistance titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take the qualified chlorination method base material, beat it and dilute it to 180g / L, raise the temperature to 30°C, adjust the pH to 10.2 with sodium hydroxide solution; add a sodium silicate solution (using SiO 2 The pH of the slurry was adjusted to 6.0 with dilute sulfuric acid, and the adjustment time was 120 minutes. After homogenizing for 30 minutes, 2.5wt% aluminum sulfate solution (using Al 2 o 3 At the same time, sodium hydroxide solution was added to keep the pH of the slurry at 7.0, and the addition time was 20 minutes. After homogenizing for 30 minutes, sand milling was carried out, and the particle size of sand milling was controlled to 0.33 μm; microwave hydrothermal reaction was carried out at 150 ° C. The reaction time is 1.5 h; after cooling to 50°C, washing with water (conductivity of water washing is less than 100 μs / cm), flash evaporation, and steam powder are carried out to obtain product 1. In the case of steam powder, in terms of solute, the add...

Embodiment 2

[0032] Take the qualified chlorination method base material, beat it and dilute it to 220g / L, raise the temperature to 40°C, adjust the pH to 10.6 with sodium hydroxide solution; add a sodium silicate solution (using SiO 2 The addition time is 30 minutes; the pH of the slurry is adjusted to 6.0 with dilute sulfuric acid, and the adjustment time is 150 minutes. After homogenizing for 30 minutes, 3.0wt% aluminum sulfate solution (based on Al 2 o 3 At the same time, sodium hydroxide solution was added to keep the pH of the slurry at 7.0, and the addition time was 30 minutes. After homogenizing for 30 minutes, sand milling was carried out, and the particle size of sand milling was controlled to 0.30 μm; microwave hydrothermal reaction was carried out at 130 ° C. The reaction time is 0.5h; after cooling to 50°C, water washing (water washing conductivity 2 The total amount of TMP is 0.35wt%, and the vapor-to-solid ratio is 1.8.

Embodiment 3

[0034] Take the qualified chlorination method base material, beat it and dilute it to 280g / L, raise the temperature to 50°C, adjust the pH to 7.2 with sodium hydroxide solution; add a zirconium oxychloride solution (using ZrO 2 ), the addition time is 30 minutes; the pH of the slurry is adjusted to 8.5 with sodium hydroxide solution, and the adjustment time is 60 minutes. After homogenizing for 30 minutes, 4.0wt% aluminum sulfate solution (using Al 2 o 3 At the same time, sodium hydroxide solution was added to keep the pH of the slurry at 7.0, and the addition time was 30 minutes. After homogenizing for 30 minutes, sand milling was carried out, and the particle size of sand milling was controlled to 0.29 μm; microwave hydrothermal reaction was carried out at 80 ° C. The reaction time is 4 hours; after cooling to 50°C, water washing (water washing conductivity 2 The total amount of TMP is 0.35wt%, and the vapor-to-solid ratio is 1.8.

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Abstract

The invention discloses a preparation method of high-weather-resistance titanium dioxide, which comprises the following steps: pulping a titanium dioxide base material, carrying out inorganic coating,sanding, carrying out a microwave hydrothermal reaction, washing with water, drying, and pulverizing to obtain the high-weather-resistance titanium dioxide. According to the preparation method of thesuper-weather-resistant titanium dioxide, a special surface treatment process is adopted, and a more uniform and compact vitreous oxide film layer can be formed on the surface of the titanium dioxideat the coating amount not exceeding 6wt% of the total mass of the titanium dioxide and at a lower coating temperature; the product obtained by the invention not only has high weather resistance, butalso 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 preparation method of highly weather-resistant titanium dioxide. Background technique [0002] Titanium dioxide is a very important white pigment. It has a wide range of uses and can be seen in all aspects of life. It is known as the monosodium glutamate of chemical raw materials and the barometer of the national economy. [0003] With the improvement of people's living standards, there are more and more stringent requirements for the aesthetics around human settlements, such as anti-corrosion paints for cars, ships, and indoor and outdoor paints that are always bright and durable. And this has a higher requirement for the weather resistance of titanium dioxide. [0004] In order to improve the weather resistance of titanium dioxide, most titanium dioxide manufacturers use a large amount of coating or high-temperature calcination to improve the weather resistance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06
CPCC09C1/3607C09C1/3623C09C1/3661C09C3/006C09C3/041C09C3/063
Inventor 陈建立王永珊冯亚阳赵姗姗王莉萍王欢欢颜世鹏
Owner LOMON BILLIONS GRP CO LTD
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