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A kind of preparation method of surface-modified titanium dioxide pigment
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A titanium dioxide, surface modification technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc.
Active Publication Date: 2021-07-06
HENAN BILLIONS NEW MATERIAL CO LTD
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Problems solved by technology
[0005] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide a method for preparing a surface-modified titanium dioxide pigment, which solves the shortcomings of the existing titanium dioxide gas-phase coating technology, and makes the surface of the titanium dioxide pigment form a uniform and dense coating layer
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Effect test
Embodiment 1
[0029] at 350 m 3 / h Pass the mixed gas into the feeding ring, the volume ratio of oxygen and chlorine in the mixed gas is 4:1. The temperature of the preheated oxygen is adjusted to 980°C, which promotes the reaction temperature of the combustion chamber to be above 1800°C. Raise the preheating temperature of TiCl4 to 380°C and then enter the AlCl3 generator, and add aluminum particles into the generator at 79.4kg / h. The content of alumina in titanium dioxide is 1.5%, and gradually increase the outlet temperature of the generator to 500°C, add 10% SiO2 and KCl mixed aqueous solution at a flow rate of 50 kg / h above the toluene combustion chamber, the mass ratio of KCl to SiO2 is 1:1, and add scar removal to the quenching end at a speed of 1.35t / h At the same time, open the Venturi sampling tube, adjust the pressure difference between the inlet and outlet, add the coating agent at 1554kg / h, wherein the mass ratio of AlCl3:SiCl4:SiO2 is 1:1.06:0.02, and the prepared titanium di...
Embodiment 2
[0031] Different from Example 1, at 350 m 3 / h Pass the mixed gas into the feeding ring, the volume ratio of oxygen and chlorine in the mixed gas is 5:1. The temperature of the preheated oxygen is adjusted to 980°C, which promotes the reaction temperature of the combustion chamber to be above 1800°C. Raise the preheating temperature of TiCl4 to 380°C before entering the AlCl3 generator, and add aluminum particles into the AlCl3 generator at 68.8kg / h, the content of alumina in titanium dioxide is 1.3%, and gradually increase the outlet temperature of the generator to 500°C. Other experimental conditions are the same as in Example 1, and the test results are shown in Table 1.
Embodiment 3
[0033] The difference from Implementation 1 is that a mixed aqueous solution of SiO2 and KCl with a concentration of 10% is added at a flow rate of 50 kg / h above the toluene combustion chamber, and the mass ratio of KCl to SiO2 is 3:1. Other conditions are the same as in Example 1, and the test results are shown in Table 1.
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Abstract
The invention discloses a method for preparing a surface-modified titanium dioxide pigment, comprising the following steps: S1, introducing O2 and Cl2 into a feeding ring, S2, introducing preheated oxygen into a toluene combustion chamber, S3, introducing preheated tetrachloride Titanium is passed into the aluminum chloride generator, and enters the feeding ring through the aluminum chloride generator. In S4, aluminum metal is added to the aluminum chloride generator. In S5, a grain refiner is added above the toluene combustion chamber. Add the grain refiner through the grain refiner inlet, S6, add the scar removal sand from the inlet of the bag filter, S7, set the Venturi sampling tube at a distance of 1.0-2.0m from the feed ring; S8, through Venturi injection tube is added with coating agent, the coating agent is composed of halides and gas phase SiO2, S9, after the coating is completed, the titanium dioxide is passed through bag filter, beating, washing and sand removal, pressure filtration, flash steaming, steam powder, packaging The finished titanium dioxide pigment is obtained; the invention can form a uniform and dense coating layer on the surface of the titanium dioxide particles.
Description
technical field [0001] The invention relates to the technical field of preparation of titanium dioxide pigments, in particular to a method for preparing surface-modified titanium dioxide pigments. Background technique [0002] Titanium dioxide pigments can be obtained by chlorination process or sulfuric acid process, and are mainly used in the fields of coatings, plastics, paper and ink. In the chloride process, titanium dioxide pigments are produced by the reaction of titanium halides with oxygen at a temperature of 1800-2000 °C. The titanium dioxide base is sand-milled to deposit metal oxides on the pigment surface by one or more wet processes, followed by washing, flashing and steaming to optimize pigment dispersion, optics or weatherability. [0003] There have been many reports at home and abroad on the method of modifying the surface of titanium dioxide pigments by wet process. CN201811088102.8 discloses a preparation method of titanium dioxide silicon zirconium alumi...
Claims
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Application Information
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