Preparation method of novel zirconium-aluminum coated titanium dioxide

Abstract

The invention discloses a preparation method of novel zirconium-aluminum coated titanium dioxide. The preparation method includes the steps that rutile type titanium dioxide screened to meet the particle size requirement is dissolved in an organic solvent for slurrying, organic zirconium salt is added into slurry for coating, zirconium salt obtained after coating is filtered, dried and dispersed, and filter liquor is cooled, filtered and volatilized and then is recycled; organic aluminum salt is dissolved in an organic solvent to prepare organic aluminum sol, zirconium-coated crystals and organic aluminum sol are in contact in a spraying mode, and zirconium-coated crystals obtained after contact are dried and dispersed again. According to the preparation method, reaction conditions are mostly mild, many washing procedures are omitted, the process is simplified, and modified titanium dioxide which is more uniform in coating effect and has both an inorganic film and an organic film can be obtained at a low cost through the coating method; meanwhile, by treating waste liquor and recycling the treated organic solvents, the cost can be further reduced, and secondary pollution to the environment can be prevented.

Description

technical field [0001] The invention relates to the field of titanium dioxide production, in particular to a preparation method of zirconium-aluminum coated titanium dioxide. Background technique [0002] As a widely used high-grade white pigment, titanium dioxide is developing rapidly in China. However, titanium oxide has strong photochemical activity, which can easily cause the organic medium molecules in the application system to prosper and break bonds and degrade, resulting in pulverization, loss of light and other phenomena. At present, the inorganic surface treatment of high-grade titanium dioxide at home and abroad generally uses one or more layers of oxides of single zirconium, single silicon and single aluminum for one or more coatings, which increases the hydrophilicity, pulverization resistance and preservation of titanium dioxide to a certain extent. color. [0003] The patent application number is 201410638417.0, the application date is 2014.11.13, and the pa...

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Problems solved by technology

[0003] The patent application number is 201410638417.0, the application date is 2014.11.13, and the patent application document of the patent name is the sulfuric acid method titanium dioxide zirconium aluminum coating method discloses a method for zirconium aluminum coating in the process of producing titanium dioxide by the sulfuric acid method. Zirconium-aluminum-coated titanium dioxide is obtained by adding the obtained titanium dioxide slurry layer by layer for conditional coating. Although this method can improve the hydrophilicity of titanium dioxide to a certain extent, it can ensure that the titanium dioxide There is a certain improvement in the glossiness of titanium dioxide, but there is no improvement in the dispersibility of titanium dioxide in organic solvents, and the reaction conditions are complex and changeable, and it takes a long time;

[0004] The patent application number is 201210591118.7, the application date is 2012.12.30, and the patent name is titanium dioxide coating method, coated titanium dioxide and coating. The patent application documents provide a method of spraying contact with organic aluminum for coating. However, in the process of using this method, there will be uneven coating, and there may be secondary pollution without impurity removal and recycling devices, resulting in certain cost increases and environmental pollution.

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