JP2003277057A5 - - Google Patents

Claims (27)

In titanium dioxide, the average particle diameter measured by laser particle size analysis is in the range of 5 to 200 μm, the purity as TiO ₂ is 99.5% by mass or more, and Fe, Ni, Cr, Al and Zr Are each 20 mass ppm or less, Si is 40 mass ppm or less, Cl is 0.05 mass% or less, and S is 50 mass ppm or less. The titanium dioxide according to claim 1 , wherein the density of the titanium dioxide is 3.7 g / cm ³ or more. The titanium dioxide according to any one of claims 1 to 2, wherein the titanium dioxide has a photocatalytic ability. Titanium dioxide has the following formula (1)
Sphericality = (circumference of a circle having the same area as the projected area of the particle) / (length of the contour of the projected particle image) (1)
The titanium dioxide according to any one of claims 1 to 3, which is a particle having a sphericity defined by (1) of 0.9 or more. The manufacturing method of the titanium dioxide as described in any one of Claim 1 thru | or 4 which introduces and manufactures raw material titanium dioxide in a flame . The raw material titanium dioxide is titanium dioxide obtained by preheating the gas containing titanium tetrachloride and the oxidizing gas to 500 ° C. or more and supplying them to the reaction tube at a flow rate of 10 m / second or more. The method for producing titanium dioxide according to claim 5, wherein: The method for producing titanium dioxide according to claim 6, wherein the reaction is carried out by retaining a gas containing titanium tetrachloride and an oxidizing gas in a temperature region exceeding 600 ° C in the reaction tube for a period of 3 seconds or less. The raw material titanium dioxide has a BET equivalent particle diameter of 7 to 500 nm, an average particle diameter of 0.4 to 10 μm measured by a laser particle size analysis method, and Fe, Ni, Cr, Al and Zr are each 20 mass ppm or less, The method for producing titanium dioxide according to any one of claims 5 to 7, which is titanium dioxide containing Si at 40 mass ppm or less, Cl at 1 mass% or less, and S at 200 mass ppm or less. The raw material titanium dioxide is vapor phase titanium dioxide containing Fe, Ni, Cr, Al, and Zr, each of 20 mass ppm or less, Si 40 mass ppm or less, Cl 1 mass% or less, and S 200 mass ppm or less. In addition, titanium dioxide having a BET equivalent particle diameter of 7 to 500 nm and an average particle diameter of 0.4 to 10 μm measured by a laser particle size analysis method, and a BET equivalent particle diameter of 150 to 1000 nm and a laser particle size analysis method. The method for producing titanium dioxide according to any one of claims 5 to 7, which is a mixed powder with titanium dioxide having an average particle diameter of 0.5 to 20 µm. The method for producing titanium dioxide according to any one of claims 5 to 9, wherein the raw material titanium dioxide is dispersed and transported by a carrier gas in a turbulent state having a Reynolds number of 10,000 or more in the pipe and introduced into the high-temperature flame. The jet velocity of the nozzle of the raw material carrier gas is 8 Nm / sec (N means the standard state. Nm / sec is the flow rate (Nm ³ / sec) converted from the flow rate of the gas ejected from the nozzle to the standard state. The flow rate obtained by dividing by the area of the jet outlet (m ² ) is shown above.) The combustion flow rate of the burner nozzle of the combustible gas is 0.8 to 4 times the nozzle flow rate of the raw material carrier gas. The burner nozzle ejection flow rate of the oxidizing gas is in the range of 1.3 to 11 times the nozzle ejection flow rate of the raw material carrier gas, and the oxidizing gas ejection flow rate is greater than the combustible gas ejection flow rate. Item 11. A method for producing titanium dioxide according to Item 10. Combustible gas, methane, ethane, propane, ethylene, propylene, acetylene, butane, LPG, hydrogen, according to claim 10 or 11, characterized in that one of carbon monoxide, or vice gaseous mixture dioxide A method for producing titanium. The method for producing titanium dioxide according to any one of claims 10 to 12, wherein the oxidizing gas contains 15% by volume to 100% by volume of oxygen. The method for producing titanium dioxide according to any one of claims 10 to 13, wherein the raw material titanium dioxide is jetted together with the carrier gas from the upstream portion of the flame in the downstream direction of the combustion gas. An organic polymer composition comprising 0.01% to 80% by mass of the titanium dioxide according to any one of claims 1 to 4 in the total mass of the composition. The organic polymer composition according to claim 15, wherein the organic polymer of the organic polymer composition is at least one resin selected from the group consisting of a synthetic thermoplastic resin, a synthetic thermosetting resin, and a natural resin. . The organic polymer composition according to claim 15 or 16, wherein the organic polymer composition is a compound. The organic polymer composition according to claim 15 or 16, wherein the organic polymer composition is a master batch. A molded article obtained by molding the organic polymer composition according to claim 15 or 16. A slurry comprising the titanium dioxide according to any one of claims 1 to 4. The coating agent characterized by including the titanium dioxide as described in any one of Claims 1 thru | or 4. The coating material characterized by including the titanium dioxide as described in any one of Claims 1 thru | or 4. A structure comprising the titanium dioxide according to any one of claims 1 to 4 on a surface. Titanium dioxide single crystal characterized by using the titanium dioxide according to any one of claims 1 to 4 as a raw material. A ceramic molded body comprising the titanium dioxide according to any one of claims 1 to 4 as a raw material. A dielectric material comprising the titanium dioxide according to any one of claims 1 to 4. Cosmetics containing the titanium dioxide as described in any one of Claims 1 thru | or 4.