Preparation process of titania hydrosol having anatase type

A titanium dioxide and anatase type technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of difficult washing impurities, restricting industrial applications, and limiting applications, and achieve the effect of expanding the scope of application

Active Publication Date: 2009-07-15
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patents CN00127951.3, CN00110406.3, CN03119113.4, CN200410029904.3, CN200410043228.5, CN200510039171.6, and CN200510012123.8 all adopt peptization methods to prepare titanium dioxide hydrosols with various properties. In the above preparation process, a The unavoidable contradiction is that the particles of orthotitanic acid sol are too small, which makes it extremely difficult to wash impurities
This actually limits the industrial application of the method
In addition, the titanium dioxide in the sol obtained by the above method is amorphous and needs to be heated for crystallization after coating (generally above 400°C), which also limits the practical application of this method

Method used

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  • Preparation process of titania hydrosol having anatase type
  • Preparation process of titania hydrosol having anatase type

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Put 112 mL of analytically pure titanium tetrachloride solution into a three-necked flask, add 388 mL of distilled water dropwise in an ice bath, and the temperature does not exceed 20°C. A stock solution of titanium dioxide (solution I) with a concentration of about 2 mol / L was obtained. Take 20mL of solution I and add 140ml of distilled water, and hydrolyze at a constant temperature of 40°C for 5 hours. A clear solution was obtained. The extraction system using trioctylamine as the extractant and toluene as the diluent (volume ratio: 2:1) was shaken at room temperature to extract the hydrolyzed transparent solution for 15 minutes. The aqueous phase and the organic phase were separated, and the organic phase was back-extracted with 20 mL of 10% sodium hydroxide at room temperature with shaking, and the obtained organic phase could be used repeatedly. Until the pH value of the aqueous phase is 6-7. The aqueous phase is a titanium dioxide hydrosol with anat...

Embodiment 2

[0016] Example 2: Add 140ml of distilled water to 20mL of the solution I in Example 1, and perform constant temperature hydrolysis at 70°C for 1.5 hours to obtain a transparent solution. A mixed system of toluene and trioctylamine (volume ratio: 2:1) was used as the extractant to shake and extract the transparent solution after hydrolysis at room temperature for 15 minutes. The aqueous phase and the organic phase are separated, and the organic phase is reverse-extracted with 20 mL of 10% sodium hydroxide at room temperature for 3 to 5 times, and the obtained organic phase can be used repeatedly. Until the pH value of the aqueous phase is 6.5-7. The aqueous phase is a titanium dioxide hydrosol with anatase characteristics, and the sol TiO 2 The weight percentage is 2%, pH=6~7. Cl - content is 1×10 -6 ~1×10 -7 mol.L -1 .

Embodiment 3

[0017] Example 3: 20 mL of the solution I in Example 1 was added to 56 ml of distilled water, and hydrolyzed at a constant temperature of 70° C. for 1 hour to obtain a transparent solution. A mixed system of toluene and trioctylamine (volume ratio: 2:1) was used as the extractant to shake and extract the transparent solution after hydrolysis at room temperature for 15 minutes. The aqueous phase and the organic phase are separated, and the organic phase is reverse-extracted with 20 mL of 10% sodium hydroxide at room temperature for 3 to 5 times, and the obtained organic phase can be used repeatedly. Until the pH value of the aqueous phase is 6.5-7. The aqueous phase is titanium dioxide hydrosol with anatase characteristics. The sol TiO 2 The weight percentage is 5%, pH=6~7. Cl - content is 1×10 -6 ~1×10 -7 mol.L -1 .

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Abstract

The present invention relates to a preparation method of photocatalysis and laser anti-counterfeiting materials, in particular to a preparation method of anatase-type titanium dioxide hydrosol, which uses titanium tetrachloride as raw material, according to the volume ratio of titanium tetrachloride and water of 1 : 1-10 diluted at 0°C-20°C, and hydrolyzed with water for 30-480 minutes at a temperature of 40-90°C. The solution formed by the above hydrolysis is extracted with a mixed extraction system using trioctylamine as the extractant and alkanes such as cyclohexane, benzene, toluene or aromatic hydrocarbons as the diluent. The aqueous phase and the organic phase are separated, and the organic phase is stripped with an inorganic base at room temperature to remove Cl- in the sol, and a titanium dioxide hydrosol with anatase characteristics is obtained. Stripping agent The hydrosol can be stored stably for more than 1 month at room temperature. The preparation process of the invention is simple and efficient, and the product can be sprayed and coated on various inorganic and organic materials for photocatalysis or laser marking and anti-counterfeiting.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic and laser anti-counterfeiting material, in particular to a preparation method of anatase-type titanium dioxide hydrosol, the material can undergo a photocatalytic reaction under the irradiation of ultraviolet light, and is applied in the field of environmental protection . At the same time, the coating film can be used to form a laser holographic anti-counterfeiting film with text on the surface of the laser holographic anti-counterfeiting image formed by molding. Background technique [0002] In the early 1970s, Professor Fujishima in Japan first discovered TiO 2 Has photocatalytic properties. When the nano-titanium dioxide particle size is smaller than a certain critical size, its quantum size effect becomes significant, the charge carrier shows quantum behavior, the conduction band and valence band become separated energy levels, the energy gap widens, and the valence band potential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 陈若愚王国平朱建飞刘小华
Owner 溧阳常大技术转移中心有限公司
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