Aluminum precursor coated titanium dioxide, preparation method thereof and method for preparing aluminum coated titanium dioxide

Abstract

The invention discloses aluminum precursor coated titanium dioxide. The surface of titanium dioxide is coated with an aluminum oxide precursor. The invention also discloses a preparation method of the aluminum precursor coated titanium dioxide and a method for preparing the aluminum coated titanium dioxide. The coating process is different from a common aluminum coating method in which hydrated alumina is directly formed and coated on titanium dioxide. According to the preparation method, the aluminum precursor is firstly generated and coats the surface of the titanium dioxide, and the aluminum precursor is of a molecular chain structure, so that the precursor is more easily coated on the surface of the titanium dioxide; the surface of the aluminum oxide precursor in the solution has a large number of hydroxyl groups, so that the repulsive interaction among particles is relatively large, the self-phase nucleation difficulty is high, and heterogeneous nucleation is facilitated, so that titanium dioxide is perfectly coated, then water is removed through drying, and non-bridging hydroxyl groups of adjacent colloidal particles are spontaneously converted into bridging hydroxyl groups; meanwhile, coordination water of a gel part structure is removed, and bridging hydroxyl groups are also formed among coating particles, so that a coating layer on the surface of the titanium dioxide is uniform and compact, and the weather resistance of the titanium dioxide is superior to that of the titanium dioxide prepared by a traditional aluminum coating method.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide coating, and in particular relates to a preparation method of aluminum-coated titanium dioxide. Background technique [0002] Titanium dioxide (TiO 2 ) is an important inorganic chemical pigment, especially under modified coating, it has important uses in industries such as coatings, printing inks, papermaking, plastic rubber, chemical fibers, and ceramics. Titanium dioxide (English name: titanium dioxide), the main component is titanium dioxide (TiO 2 ) white pigment is a polycrystalline compound whose particles are arranged regularly and have a lattice structure. At present, the main modification and coating methods of titanium dioxide include metal oxide single coating, silicon aluminum binary coating and organic coating. [0003] Among them, metal oxide single coating mainly includes alumina coating, zirconia coating, silicon oxide coating, etc., the main reagents are silicon, alum...

AI Technical Summary

Problems solved by technology

[0006] In the existing titanium dioxide coating technology, the problem of uneven coating layer is very common, such as common silicon coating, aluminum coating, zirconium coating, silicon aluminum binary coating, aluminum zirconium binary coating, due to It is difficult to control the self-phase nucleation and heterogeneous nucleation during the coating process, which may easily cause the formed coating layer to be not dense enough, and the coating is thick in some places, thin in some places, or even not

In the common inorganic coating method, whether it is unit coating or multi-component coating, there is self-nucleation of the coating agent during the coating process. These conditions will lead to different thicknesses of the coating layer on the surface of titanium dioxide, and even coating defects, so that the weather resistance of coated titanium dioxide will not increase significantly, and the application of titanium dioxide will be limited.

Especially in the current aluminum coating process, this situation is even more prominent

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