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

A technology of precursors and titanium dioxide, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of limiting the application of titanium dioxide, difficulty in controlling self-phase nucleation and heterogeneous nucleation, and the thickness of the coating layer unequal problem

Active Publication Date: 2021-11-16
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment 1

[0032] An aluminum precursor is coated with titanium dioxide, and the surface of the titanium dioxide is coated with an aluminum oxide precursor.

[0033] In this embodiment, the alumina precursor is basic ammonium aluminum carbonate.

Embodiment 2

[0035] The invention relates to an aluminum-coated titanium dioxide. The aluminum precursor coated with the titanium dioxide is dried and converted into a hydrated aluminum oxide film, and the hydrated aluminum oxide film is coated on the surface of the titanium dioxide.

Embodiment 3

[0037] A kind of preparation method of aluminum precursor coating titanium dioxide, its step comprises,

[0038] (1) Take titanium dioxide or titanium dioxide slurry prepared in the laboratory, or commercially available titanium dioxide or titanium dioxide slurry and mix it with water to prepare a titanium dioxide slurry with a concentration of 40-200g / L, and add titanium dioxide to the titanium dioxide slurry Sodium hexametaphosphate with a mass fraction of white powder of 1-5% is used as a dispersant and ultrasonically dispersed;

[0039] (2) Add 0.5-10% soluble aluminum salt accounting for titanium dioxide mass fraction, the concentration of soluble aluminum salt solution is 0.1-3mol / L, stir for 0.5h-3h; soluble aluminum salt includes but not limited to aluminum sulfate, aluminum nitrate, aluminum chloride;

[0040] (3) Add 50-200% of the soluble ammonium salt that accounts for 50-200% of the mass fraction of the soluble aluminum salt used in step (2), the concentration of...

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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...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3661C09C3/063
Inventor 邹丽霞黄前曹小红刘若妍
Owner EAST CHINA UNIV OF TECH
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