A kind of preparation method of aluminum precursor coated titanium dioxide

Abstract

The invention discloses an aluminum precursor coated titanium dioxide, wherein the surface of the 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 of the present invention is different from the usual aluminum coating method which directly forms hydrated alumina to coat the titanium dioxide. In the present invention, the aluminum precursor is first formed and coated on the surface of titanium dioxide, and the molecular chain structure of the aluminum precursor makes it easier to coat the precursor on the surface of titanium dioxide; moreover, there are a large number of hydroxyl groups on the surface of the aluminum oxide precursor in the solution, making it The repulsion between particles is relatively large, and self-nucleation is difficult, which is conducive to heterogeneous nucleation, so that the titanium dioxide is perfectly coated, and then dried to remove moisture, and the non-bridging hydroxyl groups of adjacent colloidal particles are spontaneously transformed into bridging hydroxyl groups; at the same time , the gel part structure coordination water is excluded, and bridging hydroxyl groups are also formed between the coating particles, so that the coating layer on the surface of titanium dioxide is uniform and dense, and the weather resistance of titanium dioxide is better than that of traditional aluminum coating methods.

Description

Technical field [0001] The present invention belongs to the field of titanium dioxide coating technology, specifically relates to an aluminum coated titanium dioxide preparation method. Background [0002] Titanium dioxide (TiO 2 ) is an important inorganic chemical pigment, especially under modified coating in coatings, inks, paper, plastic rubber, chemical fiber, ceramics and other industries have important uses. Titanium dioxide (English name: titanium dioxide), the main component is titanium dioxide (TiO 2 ) is a polycrystalline compound whose particles are regularly arranged and have a lattice structure. At present, the main modified coating methods of titanium dioxide include metal oxide single coating, silicon aluminum binary coating and organic coating. [0003] Among them, the metal oxide single coating mainly includes alumina coating, zirconia coating, silicon oxide coating, etc., the main reagents are silicon, aluminum, zirconium oxide, silicon, aluminum unit coating, ...

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

Images