Prepn of nano titania particle

A technology of nano-titanium dioxide and particles, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high energy consumption and long preparation cycle, achieve uniform particle size distribution, simple preparation method, and reduce particle agglomeration

Inactive Publication Date: 2004-09-08
上海华实纳米材料有限公司
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Problems solved by technology

However, some methods have a long pr...

Method used

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Embodiment 1

[0014] Dissolve tetrabutyl titanate in ethanol at room temperature to form a titanium-containing ethanol solution with a concentration of 0.3 mol / L; dissolve 5% by weight polyvinyl alcohol (PVA) with a molecular weight of 2000 in deionized water to form hydrolysis While vigorously stirring the titanium-containing ethanol solution, add the hydrolysate dropwise to the titanium-containing ethanol solution at the ratio of hydrolysis solution: titanium-containing ethanol solution = 0.3: 10 (weight ratio);

[0015] The lecithin is dissolved in carbon tetrachloride at a weight ratio of 3%, and the hydrolyzed solution is added to the titanium-containing ethanol solution: carbon tetrachloride containing lecithin at the ratio of 1:4 (weight ratio). The latter ethanol solution containing titanium was added dropwise to carbon tetrachloride containing lecithin, stirred for 2 hours, and dispersed ultrasonically for 10 minutes to form an emulsion, and continued stirring until a precipitate forme...

Embodiment 2

[0017] Dissolve titanium tetrachloride in ethanol at room temperature to form a titanium-containing ethanol solution with a concentration of 0.5mol / L; dissolve polyethylene glycol (PEG) with a molecular weight of 10,000 in deionized water at a weight ratio of 1% to form hydrolysis While vigorously stirring the titanium-containing ethanol solution, add the hydrolysate dropwise to the titanium-containing ethanol solution at the ratio of hydrolysis solution: titanium-containing ethanol solution = 0.4: 10 (weight ratio);

[0018] The lecithin is dissolved in carbon tetrachloride at a weight ratio of 3%, and the hydrolyzed solution is added at the ratio of titanium-containing ethanol solution: carbon tetrachloride containing lecithin = 1:5 (weight ratio). The latter ethanol solution containing titanium was added dropwise to carbon tetrachloride containing lecithin, stirred for 3 hours, ultrasonically dispersed for 15 minutes to form an emulsion, and continued stirring until a precipita...

Embodiment 3

[0020] Dissolve tetrabutyl titanate in ethanol at room temperature to form a titanium-containing ethanol solution with a concentration of 0.3 mol / L; dissolve polyacrylic acid (PAA) with a molecular weight of 5000 in 5% by weight in deionized water to form a hydrolysis solution , While vigorously stirring the titanium-containing ethanol solution, add the hydrolysate dropwise to the titanium-containing ethanol solution according to the ratio of hydrolysis solution: titanium-containing ethanol solution = 0.3: 10 (weight ratio);

[0021] The lecithin is dissolved in carbon tetrachloride at a weight ratio of 3%, and the hydrolyzed solution is added to the titanium-containing ethanol solution: carbon tetrachloride containing lecithin at the ratio of 1:4 (weight ratio). The latter ethanol solution containing titanium was added dropwise to carbon tetrachloride containing lecithin, stirred for 2 hours, and dispersed ultrasonically for 10 minutes to form an emulsion, and continued stirring ...

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Abstract

The preparation process of nano titania particle includes the following steps: dissolving titanium tetrachloride or tetrabutyl titanate in ethanol to form titanium-containing ethanol solution; dissolving at least one of PVA, polyglycol and polyacrylic acid of molecular weight 200-30000 in deionized water to form hydrolyzed solution; dropping the hydrolyzed solution into the titanium-containing ethanol solution and dropping the solution into organic solvent with emulsifier via stirring and ultrasonic dispersing to form emulsion and precipitate; centrifugal separation, washing with deionized water, freeze drying and of the precipitate; and heat treatment at 400-800 deg.c for 0.5-2 hr. The said process can prepare titania particle of 15-100 nm granularity, homogeneously distributed granularity and no aggregate. The nano titania particle may be rutile phase or anatase phase depending on the different heat treatment temperature.

Description

Technical field [0001] The invention relates to a method for preparing nano titanium dioxide particles. Background technique [0002] Nano-titanium dioxide particles usually have two crystal types: rutile phase and anatase phase, which are widely used. Due to its low photocatalytic activity and good stability, the rutile phase titanium dioxide can be used in anti-ultraviolet coatings and cosmetics. Titanium dioxide in the anatase phase has strong photocatalytic activity and is often used in the treatment of organic waste. At present, many technologies have been developed to prepare nanometer titanium dioxide particles. For example, Chinese patent CN1407027A uses mechanical ball milling to prepare rutile nanometer titanium dioxide, Chinese patent CN1384151A uses metatitanic acid calcining method to prepare nanometer titanium dioxide. However, some methods have longer preparation cycles and higher energy consumption. Summary of the...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01G23/053
Inventor 翁文剑黄德欢韩高荣
Owner 上海华实纳米材料有限公司
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