Method for preparing nano-titanium dioxide powder

A nano-titanium dioxide and powder technology, which is applied in the direction of titanium dioxide, nanostructure manufacturing, titanium oxide/hydroxide, etc., can solve the problems of difficult dispersion, difficulty in completeness, and large particle size of the powder, so as to achieve good preparation repeatability and improve production Efficiency and the effect of shortening the production cycle

Inactive Publication Date: 2011-01-26
CHERY AUTOMOBILE CO LTD
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  • Abstract
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Problems solved by technology

Among them, the high-temperature solid-phase sintering method disclosed in the title of the invention "a preparation method of nano-titanium dioxide" (patent number: CN02145860.X) needs to be carried out at high temperature, and the prepared TiO 2 The powder particle size is large, the sintering activity is low, the grain is too large and the reaction is not complete, and it is difficult to obtain high-purity TiO 2 Powder; the sol-gel method requires post-heat treatment to make the powder hard agglomerate and difficult to disperse; the hydrothermal synthesis method can be carried out at a lower temperature, and the obtained powder has good dispersibility and crystallinity, but the preparation cycle is long and The reaction process is not easy to control

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  • Method for preparing nano-titanium dioxide powder

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Effect test

Embodiment 1

[0021] Step 1: preparing titanium dioxide hydrothermal reaction precursor. Measure a certain amount of n-butyl titanate and absolute ethanol, the volume ratio of n-butyl titanate and absolute ethanol is 4:1, stir magnetically for 0.5h to make it evenly mixed, and then continue to drop 0.5ml of distilled water to control The dropping rate was 0.5ml / min, and the stirring was continued after the dropping was completed to obtain a light yellow sol, which was then fully stirred for 1 hour to obtain a hydrothermal reaction precursor.

[0022] Step 2: microwave-hydrothermal synthesis reaction. Put the precursor obtained in step 1 into a polytetrafluoroethylene-lined reactor with a fixed filling degree of 70%, and tightly seal the reactor. The reaction kettle was placed in a microwave-assisted hydrothermal synthesizer, the reaction temperature was controlled at 180°C, the pressure was 1.0 MPa, and the reaction time was 90 minutes. After the required time was reached, the temperature ...

Embodiment 2

[0027] Step 1: preparing titanium dioxide hydrothermal reaction precursor. Measure a certain amount of n-butyl titanate and absolute ethanol, the volume ratio of n-butyl titanate and absolute ethanol is 5:1, and magnetically stir for 1 hour to make them evenly mixed. Then continue to add 1ml of distilled water dropwise, and control the dropping rate to 0.5ml / min. After the dropwise addition, continue to stir to obtain a light yellow sol, and then fully stir for 0.5h to obtain a hydrothermal reaction precursor.

[0028] Step 2: microwave-hydrothermal synthesis reaction. Put the precursor obtained in step 1 into a polytetrafluoroethylene-lined reactor with a fixed filling degree of 80%, and tightly seal the reactor. The reaction kettle was placed in a microwave-assisted hydrothermal synthesizer, the reaction temperature was controlled at 200°C, the pressure was 1.5 MPa, and the reaction time was 60 minutes. After the required time was reached, the temperature was cooled to room...

Embodiment 3

[0031] Step 1: preparing titanium dioxide hydrothermal reaction precursor. Measure a certain amount of n-butyl titanate and absolute ethanol, the volume ratio of n-butyl titanate and absolute ethanol is 6:1, then continue to drop 2ml of distilled water, control the dropping rate to 1ml / min, drop Stirring was then continued to obtain a pale yellow sol. Then fully stir for 1 h to obtain the hydrothermal reaction precursor.

[0032] Step 2: microwave-hydrothermal synthesis reaction. Put the precursor obtained in step 1 into a polytetrafluoroethylene-lined reactor with a fixed filling degree of 60%, and seal the reactor tightly. The reaction kettle was placed in a microwave-assisted hydrothermal synthesizer, the reaction temperature was controlled at 170°C, the pressure was 2.0 MPa, and the reaction time was 40 minutes. After the required time was reached, the temperature was cooled to room temperature by natural cooling.

[0033] Step 3: Wash and dry. The product obtained in ...

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Abstract

The invention relates to a method for preparing nano-titanium dioxide powder, which comprises the following steps of: preparing a titanium dioxide hydrothermal reaction precursor; putting the prepared precursor into a reaction kettle, and putting the reaction kettle into a microwave hydrothermal synthesizer for reaction to obtain a reaction product; and washing and drying the obtained reaction product. The nano-titanium dioxide powder prepared by the method has the advantages of uniform particle size and high dispersibility.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of nano titanium dioxide powder. Background technique [0002] TiO 2 It is a cheap, widely used, non-toxic, stable and corrosion-resistant inorganic material, which is widely used in paints, coatings, chemical fibers, plastics, ceramics and other fields. With the development of nanomaterials, nano-TiO 2 It is widely used in catalysts, sensitive components, etc. With the technical progress of dye-sensitized solar cells and its good industrialization prospects in recent years, nano-TiO is the best choice for photoanode materials. 2 Powder has also begun to receive great attention. [0003] In the prior art, TiO 2 The preparation methods of powder mainly include high temperature solid phase sintering method, sol-gel method and hydrothermal method. Among them, the high-temperature solid-phase sintering method disclosed in the title of the invention "a pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82B3/00
Inventor 焦方方
Owner CHERY AUTOMOBILE CO LTD
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