Water-soluble titanium dioxide and preparation method thereof

Abstract

The invention discloses a method for preparing water-soluble titanium dioxide. The method comprises the following steps: 1) preparing a titanium compound solution with the concentration of 5-50 wt%; 2) uniformly mixing the titanium compound solution, alcohol, inorganic acid and organic acid to obtain a mixed solution; 3) stirring the mixed solution at 90-130 DEG C to obtain a heat treatment solution; 4) adding deionized water and alcohol into the heat treatment solution, and uniformly mixing all the components to obtain an alcohol treatment solution; 5) adding a modifier into the alcohol treatment liquid to obtain a dispersion liquid; 6) stirring the dispersion liquid at 120-150 DEG C, and then adding alcohol to obtain sol; 7) drying and grinding the sol to obtain the water-soluble titanium dioxide. According to the method, subsequent calcination and addition of a dispersing agent are not needed, the prepared water-soluble titanium dioxide is directly dispersed in water to form a transparent sol, the dispersity is good, and a film formed by the prepared water-soluble titanium dioxide and a water-based coating prepared from the water-soluble titanium dioxide have photocatalytic properties.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide preparation, and in particular relates to a water-soluble titanium dioxide and a preparation method thereof. Background technique [0002] The stable dispersion mechanism of nanoparticles in liquid medium is determined by the interaction between nanoparticles. It includes four aspects: the intermolecular van der Waals attraction; the electric double layer force generated between the particles with the same charge, which is generally expressed as repulsion; the steric hindrance formed by the surfactant or polymer adsorbed on the particle surface; The solvating force generated by the hydration molecules on the particle surface is weak and can be either attractive or repulsive depending on the nature of the surface and the arrangement of the solvent. The mutual magnitude of the above four forces determines the dispersion stability of the system. Among them, electrostatic stabilization and ...

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional preparation process of nano-titanium dioxide powder, due to the large specific surface area and high surface energy of nano-titanium dioxide particles, the van der Waals attraction and Coulomb force between particles, the mutual agglomeration of particles reduces the total surface area and surface free energy.

Nanoparticles are very easy to agglomerate, easy to form secondary particles, forming soft and hard agglomerates, and the particle size of the secondary particles reaches micron level, which affects the advantages of nanoparticles and loses the functions of nanoparticles

In the final application of nano-titanium dioxide, there are problems of uneven dispersion and low use efficiency

In particular, titanium dioxide dispersions on the market are often prepared by adding dispersants such as sodium metaphosphate. The disadvantage of this type of dispersion is that the formed sol system is unstable, and changes in external conditions can easily cause titanium dioxide to precipitate.

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