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Nano titanium oxide and mechanical force chemical reaction preparation method for its composite powder

A technology of nano-titanium dioxide and composite powder, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of harsh synthesis conditions, high production costs, and increased processing technology, so as to speed up the chemical reaction and shorten the chemical reaction time , the effect of increasing the specific surface area

Inactive Publication Date: 2007-10-31
SICHUAN UNIV
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Problems solved by technology

[0003] From the contents of the above Chinese patent applications, it can be seen that these preparation methods require complex equipment, relatively harsh synthesis conditions, and a long production cycle, so the production cost is relatively high
In addition, in order to reduce the optical activity of nano-titanium dioxide, it is necessary to carry out surface coating treatment on nano-titanium dioxide, which increases the subsequent treatment process.

Method used

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  • Nano titanium oxide and mechanical force chemical reaction preparation method for its composite powder

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Embodiment 1

[0026] In this embodiment, the reactant is butyl titanate, and the ligand is oxalic acid. The process flow is shown in Figure 1, with the following steps in sequence

[0027] 1. Ingredients

[0028] The molar ratio of butyl titanate to oxalic acid is 1:3

[0029] 2. Mixing

[0030] Mix the proportion of butyl titanate and oxalic acid until uniform;

[0031] 3. Preparation of precursors by mechanochemical reaction method

[0032] The uniformly mixed butyl titanate and oxalic acid are ball milled at room temperature and normal pressure, so that they react to form precursors under the action of mechanical shear force and impact force generated during the ball milling process, and the speed of the ball mill is controlled at 300 rpm , 50 minutes of ball milling can make butyl titanate and oxalic acid completely react to form precursors;

[0033] 4. Precursor removal

[0034] The impurity removal of the precursor adopts the washing and filtering method, the detergent is ethanol...

Embodiment 2

[0041] In the present embodiment, the reactant is titanium sulfate, and the ligand is sodium carbonate. The process flow is shown in Figure 1, and the following steps are arranged successively

[0042] 1. Ingredients

[0043] The molar ratio of titanium sulfate to sodium carbonate is 1:4

[0044] 2. Mixing

[0045] Mix titanium sulfate and sodium carbonate in proportion until uniform;

[0046] 3. Preparation of precursors by mechanochemical reaction method

[0047] The uniformly mixed titanium sulfate and sodium carbonate are ball milled at room temperature and normal pressure, so that they react to form precursors under the action of mechanical shear force and impact force generated during the ball milling process. The speed of the ball mill is 320 rpm. It takes 40 minutes to completely react titanium sulfate and sodium carbonate to form precursors;

[0048] 4. Precursor removal

[0049] The impurity removal of the precursor adopts the washing and filtering method, the d...

Embodiment 3

[0056] In this embodiment, the reactant is a complex of titanium sulfate and zinc sulfate, and the ligand is oxalic acid. The process flow is shown in Figure 1, and there are the following steps in turn

[0057] 1. Ingredients

[0058] The molar ratio of the complex of titanium sulfate and zinc sulfate to oxalic acid is 1:3, and the molar ratio of titanium sulfate and zinc sulfate in the complex is 10:1;

[0059] 2. Mixing

[0060] Mix the composite of titanium sulfate and zinc sulfate in proportion with oxalic acid until uniform;

[0061] 3. Preparation of precursors by mechanochemical reaction method

[0062] The uniformly mixed reaction system is ball milled at room temperature and normal pressure, so that it reacts to form a precursor under the action of mechanical shear force and impact force generated during the ball milling process. It can completely react titanium sulfate, zinc sulfate and oxalic acid to form precursors;

[0063] 4. Precursor removal

[0064] The ...

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Abstract

The invention discloses a preparing technology of nanometer titanium oxide and composite powder body, which comprises the following steps: using shearing force and impact force generated in balling course to bruise solid phase reacting system; increasing specific surface area of the reactant; improving reaction rate to advance the ratio of nucleation rate and growth rate; preparing fine and even forerunner material; washing; drying; controlling the temperature and time of heat decomposition; getting nanometer titanium oxide and composite powder body with diverse crystal system and grain size; realizing surface coating of nanometer titanium oxide. This method possesses simple craft and can control crystal system, outlook and grain diameter of nanometer titanium oxide, which powder grain diameter distribution is 30-80nm.

Description

1. Technical field [0001] The invention patent belongs to the "nano-oxide powder preparation technology", which involves a preparation method of nano-titanium dioxide and its composite powder that can be used in cosmetics, coatings and other fields. 2. Background technology [0002] Nano-TiO 2 Because it is safe, non-toxic, non-irritating, safe and reliable to use, it has a good shielding effect on UVA and UVB, good stability, does not decompose and does not change color after absorbing ultraviolet rays, so it is widely used in sunscreen cosmetics, exterior wall coatings, etc. UV shielding field. At present, physical methods such as vapor deposition and sputtering and chemical methods such as sol-gel and hydrothermal synthesis are often used to prepare nano-titanium dioxide powder and film. For example: a Chinese patent application with application number 200410022136.9 titled "A Preparation Method for Nano-Titanium Dioxide with Controllable Particle Size Distribution", an...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 朱达川涂铭旌黄婉霞
Owner SICHUAN UNIV
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