Preparation process for improving weather resistance of titanium dioxide

Abstract

The invention provides a preparation process for improving weather resistance of titanium dioxide. The preparation process specifically comprises the following steps: (1) adding a dispersing agent and deionized water into titanium dioxide, and controlling the temperature at 50-80 DEG C to prepare titanium dioxide slurry with the concentration of 250-300g / L; (2) adding tetraethoxysilane, isopropanol and water into a reaction kettle, stirring for 10-20 minutes, adding a catalyst, carrying out ultrasonic treatment for 200-240 minutes, adding (3-anilinopropyl) trimethoxysilane, and continuously carrying out ultrasonic treatment for 180-220 minutes to obtain a coating agent; and (3) adding the coating agent obtained in the step (2) into titanium dioxide slurry in batches under a stirring condition, carrying out ultrasonic treatment for 2-4 hours, controlling the temperature to be 50-70 DEG C, simultaneously controlling the pH to be 5, aging for 2-3 hours under a stirring condition, and filtering, washing and drying a suspension to obtain the high-weather-resistance titanium dioxide. The titanium dioxide prepared by the preparation process has higher weather resistance; and the ultrasonic treatment method can reduce the overall viscosity in the coating process, improve the agglomeration of the titanium dioxide, enhance the reaction activity of hydroxyl on the surface of the titanium dioxide and enhance the coating effect.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide preparation, in particular to a preparation process for improving the weather resistance of titanium dioxide. Background technique [0002] Titanium dioxide, chemical name: titanium dioxide (TiO 2 ), is a polymorphic compound that is non-toxic and harmless to the human body. It is also the best white pigment in the world. It not only has very stable physical and chemical properties, but also has a high refractive index, the best hiding power, and the best whiteness. It is widely used in coatings, plastics, papermaking, ink, electronics and other fields due to its excellent optical and electrical properties such as the ability to absorb ultraviolet rays, and has high commercial value. [0003] High hiding power and weather resistance are the key characteristic indicators of high-performance pigmented titanium dioxide, because there are lattice defects in the normal production of titanium ...

AI Technical Summary

Problems solved by technology

[0003] High hiding power and weather resistance are the key characteristic indicators of high-performance pigmented titanium dioxide, because there are lattice defects in the normal production of titanium dioxide crystals, such defects include electronic defects, point defects and composite defects, and it is precisely because of this defect that it gives its Brings photocatalytic activity, forms active centers in catalytic oxidation, generates electrons and holes under ultraviolet radiation, and generates free radicals after reacting with water and oxygen. In order to improve the weather resistance and chemical stability of titanium dioxide, Improve the dispersion of titanium dioxide in various media, usually for TiO 2 For surface treatment, in order to overcome the above shortcomings of titanium dioxide, the surface of titanium dioxide particles is often coated with one or more layers of inert inorganic protective films by chemical methods, but this method is prone to agglomeration during coating, coating The effect is not ideal, and a large number of uncoated titanium dioxide particles seriously affect the dispersion performance and weather resistance of titanium dioxide