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Solution of particles containing titanium dioxide and titanium peroxide complex and preparation thereof

A technology of titanium dioxide and titanium peroxide, applied in the directions of titanium oxide/hydroxide, titanium dioxide, titanium compound, etc., can solve problems such as inconvenience and achieve the effect of reducing product cost

Inactive Publication Date: 2009-06-03
AGENCY FOR SCI TECH & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many applications where large amounts of heating can be problematic or cause inconvenience

Method used

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  • Solution of particles containing titanium dioxide and titanium peroxide complex and preparation thereof
  • Solution of particles containing titanium dioxide and titanium peroxide complex and preparation thereof
  • Solution of particles containing titanium dioxide and titanium peroxide complex and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0056] Hydrated titanium oxide was prepared as follows. First, add 5 liters of deionized water to the container. The water is ice-cooled at a temperature of 5-7°C. Add 33ml of 36.6wt% TiCl to the container 4 The solution. TiCl 4 The solution is from Sumitomo TM Co. acquired. Add 200ml of 3.0% NH to the container 4 OH NH 4 OH dilute solution. Mix the contents of the container by stirring. Then add to the vessel containing 30% NH 4 concentrated solution of OH until the pH of the mixed solution in the container is about 7. The mixed solution in the container was allowed to stand at room temperature until the hydrated titanium oxide precipitated. Then the contents in the container are washed with water until the conductivity of the liquid contents measured by a conductivity meter reaches 6˜20 μS / m. The precipitate in the vessel was separated from the liquid material to form a hydrated titania mass weighing 94 g and containing about 9.3% solid TiO 2 particles.

[005...

Embodiment II

[0059] Different PTC solutions were prepared in a similar manner to that described in Example 1, except that the concentration of ammonium hydroxide in the mixed solution was changed to 0, 100, 200, 400, 600, 800, 1,000, 1,200, 1,400, or 1,500 ppm, respectively outside. Moreover, two PTC solutions were prepared in a similar manner except that amines, ethanolamine (H 2 NCH 2 CH 2 OH), replacing the ammonium hydroxide at concentrations of 500 and 1,000 ppm, respectively.

[0060] It was found that the ammonium concentration in the mixed solution had a significant effect on the final appearance of the solution as well as the time required to form a clear solution. The test results for the two series are listed in Table IA and Table IB, respectively. As can be seen from Table IA and Table IB, NH up to 600ppm can be used 4 OH concentration to obtain a transparent PTC solution. However, in one test, 500ppm of NH 4 The OH sample solution produced a precipitate, which in this c...

Embodiment III

[0066] With 300ppm NH 4 OH, the PTC solution was prepared as in Example I, except that the final solution was aged without stirring. It was observed that the viscosity of the PTC solution increased with time, and the solution became translucent with time. When the pH of the solution reaches about 5, a gel develops in the solution.

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Abstract

In solution, hydrous titanium oxide (HTO) reacts with hydrogen peroxide (H2O2) in the presence of a volatile base catalyst to produce a titanium peroxide complex (PTC), thus preparing solution of titanium dioxide particles. The solution is diluted by at least two folds. Then, part of the volatile catalyst is removed from the solution by evaporation to form the particles, and the particles contain the titanium dioxide and the PTC which is adsorbed on the particle, thus obtaining the transparent solution with the pH being 7. The particles in the solution can have minus 60-minus 80mV xi electric potential, 10nm-25nm particle size and more than 4wt% concentration, such as 6-8wt%.

Description

technical field [0001] The present invention relates to solutions containing particles of titanium dioxide and a peroxo-titanium complex, and their preparation. Background technique [0002] Titanium dioxide (TiO2) with adsorbed titanium peroxide complex (PTC) in granular form 2 ) particles have a wide range of commercial and industrial applications due to their desirable optical and chemical properties. PTCs contain coordination complexes containing Ti(IV) ions and peroxo ligands bonded to the Ti(IV) ions. TiO 2 Can be in different phases. For example, anatase TiO 2 Can act as a photocatalyst, containing anatase TiO 2 The coating has photoactivated self-cleaning properties. In conventional technology, this TiO 2 Particles are prepared and stored in solution. [0003] However, conventional methods of preparing such solutions suffer from several drawbacks, some of which are discussed in Ichinose, US Patent 6,602,918, issued August 5, 2003 (hereinafter "Ichinose"). Ic...

Claims

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Application Information

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IPC IPC(8): C01G23/00C01G23/047C01G23/053
CPCC01G23/0536C01P2002/72C01P2004/64C01P2004/04C01P2006/60B82Y30/00
Inventor 蔡汝雄
Owner AGENCY FOR SCI TECH & RES
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