Abstract

Provided is a preparation method for a titanium dioxide material, comprising the following steps: (1) preparing a titanium oxychloride solid powder compound; (2) controlling the water content of the titanium oxychloride solid powder compound in step (1) to be 1% to 50% by mass of water; preferably, the water content being 5% to 30%; and (3) heating the titanium oxychloride solid powder compound in step (2) at a low temperature in a closed environment, so as to obtain the titanium dioxide material. The preparation method for the nano titanium dioxide material can be used for large-scale development of low-cost, high-performance nano titanium dioxide materials.

IPC Classes  ?

• C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts
• C01G 23/047 - Titanium dioxide
• B01J 21/06 - Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof

Abstract

A method for preparing titanium dioxide and a method for improving titanium dioxide dispersibility. A method for preparing a low-temperature crystallized titanium dioxide, the method comprising the following steps: (1) subjecting a titanium compound to hydrolysis, separation, purification and drying processes to obtain hydrated titanic acid; (2) heating the hydrated titanic acid to 100°C to 200°C; and (3) introducing hydrogen chloride gas into the heated hydrated titanic acid system and carrying out a constant pressure reaction to obtain a crystalline nano titanium dioxide material. The technical method of the low-temperature crystallized titanium dioxide can improve the precipitation synthesis method of nano titanium dioxide, and can also improve the performances and application field of titanium dioxide nano materials.

IPC Classes  ?

• C01G 23/047 - Titanium dioxide
• C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts

Abstract

Provided are a titanium dioxide material, a preparation method therefor and a use thereof, and a method for improving the dispersibility of titanium dioxide. The preparation method for a titanium dioxide material comprises: reacting a titanium alkoxide with water to form a hydrated titanium hydroxide precipitate; separating and drying the hydrated titanium hydroxide precipitate; mixing the dried titanium hydroxide with a small amount of an acid solution; heating the titanium hydroxide and acid solution mixture to react under sealed conditions so as to obtain a solid titanium dioxide material comprising crystalline nano-titanium dioxide particles. The solid titanium dioxide material can spontaneously disperse in water to form an aqueous dispersion in which the nano-titanium dioxide particles are stably suspended. Said material can be used in the preparation of composite materials, or in the fields of air and water purification, antibacterial disinfection, self-cleaning, sun protection and skin care, and so on. The method for improving the dispersibility of titanium dioxide comprises: placing a precursor solid titanium dioxide A in a container, filling same with hydrogen chloride gas and performing low-temperature heating to obtain a dispersible titanium dioxide B product.

IPC Classes  ?

• C01G 23/047 - Titanium dioxide
• B01J 21/06 - Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof

Abstract

A preparation method for nano titanium dioxide, comprising the following steps: mixing titanium oxide powder with a small amount of water and a catalyst; and performing heat treatment after sealing, so as to obtain a nano titanium dioxide product. The titanium oxide powder comprises one or a combination of more of low crystalline titanium dioxide, amorphous titanium dioxide, titanic acid, metatitanic acid, titanium hydroxide, polytitanic acid and hydrated titanium acid. The catalyst is an acid or a chloride. The specific acid is one or a combination of more selected from hydrochloric acid, perchloric acid, hypochlorous acid, nitric acid, hydrofluoric acid, sulfuric acid and acetic acid. The specific chloride is one or a combination of more selected from titanium tetrachloride, titanium trichloride, titanium oxychloride, silicon tetrachloride, aluminium chloride and zirconium chloride.

IPC Classes  ?

• C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts

Abstract

A method and a device for preparing monodisperse nano titanium dioxide, by means of which a nano titanium dioxide material with excellent performances can be developed at a low cost and on a large scale. A device for preparing monodisperse nano titanium dioxide by using a vapor bath process is comprised, wherein vapor is provided by means of a mixed vapor of hydrochloric acid and water formed by heating a hydrochloric acid solution, and the vapor pressure is greater than one atmosphere. The device comprises a sealed reaction kettle placed in an environment of 100°C to 200°C, and a container A and a container B located in the sealed reaction kettle, wherein the container A is used for containing a solid titanium oxide powder; the container B is used for containing the hydrochloric acid solution; the container B has a vapor outlet in communication with the interior of the sealed reaction kettle; and the container A has a vapor inlet in communication with the interior of the sealed reaction kettle.

IPC Classes  ?

• C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts
• B01J 21/06 - Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof

Abstract

Provided are a nano titanium dioxide powder material having a monodisperse, stably suspended, and transparent rutile phase, and a preparation method therefor. A titanium dioxide material is comprised, wherein the surface of the titanium dioxide material is acidic; the titanium dioxide material is composed of crystalline nano titanium dioxide particle agglomerates with a particle diameter of less than 200 nanometers; and the titanium dioxide particle agglomerates can be spontaneously dispersed in pure water without an additive or a dispersant to form a stably suspended nano titanium dioxide particle dispersion.

IPC Classes  ?

• C01G 23/053 - Producing by wet processes, e.g. hydrolysing titanium salts
• B01J 21/06 - Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof