Production method of titanium oxide sol
AssigneeNissan Chemical Industries, Ltd.
InventorsHirokazu Kato, Natsumi Tsuihiji
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Abstract
There is provided a method for efficiently producing an anatase-type titanium oxide sol in an extremely advantageous dispersion state. The method comprises mixing a titanium alkoxide, an organic acid, and a quaternary ammonium hydroxide with water in a molar ratio of the organic acid of 0.4 to 4.0 relative to 1 mol of a titanium atom of the titanium alkoxide and in a molar ratio of the quaternary ammonium hydroxide of 0.8 to 1.9 relative to 1 mol of the organic acid to prepare an aqueous mixed solution having a concentration in terms of TiO2 of 0.5 to 10% by mass; heating the aqueous mixed solution to 50 to 100° C. to remove an alcohol; and subjecting the resulting titanium-containing aqueous solution to a hydrothermal treatment at 110 to 170° C.
Claims5
A production method of an anatase-type titanium oxide sol, comprising the processes (a) to (c):
- (a) mixing a titanium alkoxide, an organic acid, and a quaternary ammonium hydroxide with water in a molar ratio of the organic acid of 0.4 to 4.0 relative to 1 mol of a titanium atom of the titanium alkoxide and in a molar ratio of the quaternary ammonium hydroxide of 0.8 to 1.9 relative to 1 mol of the organic acid to prepare an aqueous mixed solution having a concentration in terms of TiO2 of 0.5 to 10% by mass;
- (b) heating the aqueous mixed solution to 50 to 100° C. to remove an alcohol to prepare a titanium-containing aqueous solution;
- and
- (c) subjecting the titanium-containing aqueous solution to a hydrothermal treatment at 110 to 170° C.
Dependencies are inferred from the claim text.