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Microwave irradiation modification method of titanium dioxide sol

A technology of titanium dioxide and microwave irradiation, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of easy cracks in films, poor dispersion of colloidal particles, and weak carrier binding, etc., to reduce by-products and crystallization Effect of temperature, induced catalysis

Active Publication Date: 2015-04-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the colloidal particles prepared by this method have poor dispersion, easy agglomeration between colloidal particles, and high crystallization temperature, and the film is prone to defects such as cracks and weak bonding with the carrier during drying and heat treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Add butyl titanate to acetylacetone at a molar ratio of 1:6, stir vigorously at 60°C for 5 hours, then add deionized water dropwise, and continue stirring for 3 hours to obtain a concentration of 0.3mol / L and a pH value of Titanium dioxide sol of 5;

[0017] 2) Flow the titanium dioxide sol into the serpentine tube of the microwave irradiator at a rate of 30L / min, and ensure that the microwave irradiation time of the sol is 1h by controlling the flow rate of the sol, and at the same time ensure that the temperature of the sol is at 200°C by adjusting the microwave power, The pressure is guaranteed to be 1MPa through the adjustment of the pressure valve.

[0018] The colloidal particle size of the titanium dioxide sol modified in this embodiment is only 20 nanometers.

Embodiment 2

[0020] 1) Add isopropyl titanate to ethylenediaminetetraacetic acid at a molar ratio of 1:1, stir vigorously at 80°C for 1h, then add deionized water dropwise, and continue stirring for 5h to make the concentration 2mol / L , a titania sol with a pH value of 7;

[0021] 2) Flow the titanium dioxide sol into the serpentine tube of the microwave irradiator at a rate of 100L / min, and ensure that the microwave irradiation time of the sol is 0.5h by controlling the flow rate of the sol, and at the same time, ensure that the temperature of the sol is at 100°C by adjusting the microwave power , through the adjustment of the pressure valve to ensure the pressure at 4MPa.

Embodiment 3

[0023] 1) Add titanium salt to lactic acid at a molar ratio of 1:10, stir vigorously at 40°C for 8 hours, then add deionized water dropwise, and continue stirring for 1 hour to make a solution with a concentration of 0.01mol / L and a pH value of 3. Titanium dioxide sol; among them, titanium salt is formed by mixing titanium chloride and titanyl sulfate with a mass ratio of 3:1

[0024] 2) Flow the titanium dioxide sol into the serpentine tube of the microwave irradiator at a rate of 10L / min, and ensure that the microwave irradiation time of the sol is 4h by controlling the flow rate of the sol, and at the same time, ensure that the temperature of the sol is at 50°C by adjusting the microwave power. The pressure is guaranteed to be 0.1MPa through the adjustment of the pressure valve.

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PUM

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Abstract

The invention discloses a microwave irradiation modification method of titanium dioxide sol. The method comprises the following steps: adding titanium dioxide sol to a coiled pipe of a microwave irradiator, and carrying out microwave irradiation at 50-300 DEG C and 0.1-4MPa for 0.5-4 hours, so as to finish microwave irradiation modification of the titanium dioxide sol. The method is short in reaction time, low in cost, low in energy consumption, and suitable for industrialized production, and can be continuously prepared; and the modified titanium dioxide sol is low in crystallization temperature, small in sol particle size, narrow in distribution, and excellent in film-forming property.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a microwave irradiation modification method for titanium dioxide sol. Background technique [0002] As an important inorganic functional material, titanium dioxide has attracted much attention because of its good photocatalytic properties, high dielectric properties, weather resistance, and corrosion resistance. Therefore, the preparation of nano-titanium dioxide thin films with high purity, good crystallinity, uniform density, and stable performance is the prerequisite for its excellent performance to be realized and put into application. At present, the general methods for preparing nano-titanium dioxide films include hydrothermal synthesis, vapor deposition, electrochemical methods, and sol-gel methods, among which the sol-gel method is characterized by easy control, less side reactions, and simple process operation. , has been widely adopted in recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/146
Inventor 徐友龙杜显锋王杰
Owner XI AN JIAOTONG UNIV
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