Preparation method of monodisperse anatase nano-titanium dioxide transparent liquid phase dispersion

Abstract

The invention discloses a monodisperse anatase nanometer titanium dioxide transparent liquid-phase dispersion body preparation method, which comprises: dissolving a titanium salt precursor in an alcohol solvent, stirring at a normal temperature for 20-40 min, adding an acid, and recording as a material liquid A; mixing an alcohol solvent and deionized water at a normal temperature, and recording as a material liquid B; preparing a supergravity rotating packed bed reactor, and keeping the temperature of the reactor at 5-50 DEG C; simultaneously adding the material liquid A and the material liquid B into the supergravity rotating bed reactor, and carrying out a reaction to obtain a reaction solution after the reaction; transferring the reaction solution into a high-temperature and high-pressure reaction kettle, and carrying out a solvothermal or hydrothermal reaction to obtain a titanium dioxide white precipitate; and centrifuging the titanium dioxide white precipitate, washing, modifying, and dispersing in different solvents to obtain the monodisperse anatase nanometer titanium dioxide transparent liquid-phase dispersion body. According to the invention, the prepared liquid-phase dispersion body has high Zeta potential and obvious Tyndall effect; and the dispersoid can be stably dispersed for more than or equal to 6 months after being properly modified.

Description

technical field [0001] The invention relates to the technical field of preparation of fluorescent dyes, in particular to a method for preparing a monodisperse anatase nano-titanium dioxide transparent liquid phase dispersion. Background technique [0002] Nano-titanium dioxide is a non-toxic, odorless, non-polluting inorganic non-metallic material. Due to its small particle size, large specific surface area, good light absorption performance, strong ability to absorb ultraviolet rays, high surface activity, and good thermal conductivity, it is widely used It is widely used in dyes, food, cosmetics, photocatalysis and solar cells, etc. Among the three natural crystalline forms of titanium dioxide (anatase, rutile, and brookite), anatase has been the most extensively studied because of its excellent optoelectronic and photochemical properties. [0003] As we all know, the application performance of nano titanium dioxide mainly depends on its size, dispersion and shape. Tradi...

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Problems solved by technology

Traditional preparation methods include precipitation method, thermal decomposition method, hydrothermal method, solvothermal method, and sol-gel method. Different methods have different advantages and disadvantages. Most of the above methods produce nano-titanium dioxide powder, which is easy to agglomerate and cannot Give full play to its excellent characteristics. For example, the Chinese patent publication number is CN1490249, and the patent named "a preparation method of nano-titanium dioxide" uses a high-gravity rotating packed bed reactor to produce nano-titanium dioxide powder. Titanium tetrachloride or sulfuric acid Titanium oxide is used as raw material, and hydrated titanium dioxide is prepared by neutralization and hydrolysis in a rotating packed bed reactor, and then dried and calcined to obtain nano-titanium dioxide products

The production process is short and the production efficiency is high, but the defect of this method is that the agglomeration of the prepared titanium dioxide particles is relatively serious, cannot be dispersed, and cannot exert the excellent characteristics of nano-titanium dioxide

This method prepares anatase titanium dioxide nanoparticle dispersion in water and a suitable complexing solvent mixture. The defect of this method is that titanium dioxide cannot realize the dispersion of organic phase and aqueous phase, and the process is more complicated, and the dispersion stability is not high. Cannot achieve shape control

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