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Method for preparing weak excitation photochromism WO3 powder by utilizing n-propanol hybridization

A technology of n-propanol and excitation light, which is applied in the direction of chemical instruments and methods, luminescent materials, color-changing fluorescent materials, etc., can solve the problems of complex powder preparation methods and strict requirements for photochromic excitation light sources, etc. The effect of link structure stabilization

Inactive Publication Date: 2010-02-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a small amount about WO 3 In the research report of powder preparation and photochromism, the powder preparation method is complicated, especially for WO 3 Extremely demanding requirements for photochromic excitation light sources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, prepare 1mol / L Na 2 WO 4 Solution 50ml, under the action of magnetic stirrer stirring at a speed of 400r / min, drop HCl to adjust the pH value of the solution to 1.0, while stirring, dropwise add n-propanol 6ml, stir and homogenize the obtained reaction system for 4 Hours later, put it into a hydrothermal kettle for hydrothermal reaction at 100°C for 48h. The product powder is then collected and washed. The reaction product is first washed with distilled water until the pH value of the clear solution is 6.5-7.5, and then washed with absolute ethanol to wash away excess n-propanol remaining therein. Finally, put the hybridized powder into a vacuum drying oven to dry for 1 h under the conditions of a vacuum degree of 0.085 and a temperature of 50°C. Utilize SC-80C full-automatic colorimeter (Beijing Kangguang Instrument Co., Ltd.) to measure powder chromaticity to be 2.693; Watt, the wavelength of ultraviolet light selected is 365nm. The powder body is 10cm away...

Embodiment 2

[0029] The difference from Example 1 is to test WO between 12:00 noon and 14:00 on a sunny day 3 The photochromic performance of the powder, its chromaticity value is 48.835 after being illuminated for 20 minutes, and fades after being moved into a dark place for 2 hours, and its chromaticity value is 2.382.

Embodiment 3

[0031] Different from embodiment one is the Na of preparation 0.1mol / L 2 WO 4 Solution 50ml, adjust the pH value of the final system to 2.0, the amount of n-propanol added is 1 / 2 of that of Example 1, the homogenization time is 6 hours, the reaction temperature of hydrothermal is 180°C, and the reaction time is 72 hours, The measured chromaticity value of the hybrid powder is 2.382, and after 20 minutes of ultraviolet light irradiation, WO 3 The powder turned blue with a chroma value of 37.784, and faded after being moved into a dark place for 1.5 hours, with a chroma value of 2.417.

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PUM

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Abstract

The process of hybridizing n-propanol to prepare weak excitant photochromic WO3 powder includes the following steps: 1. preparing tungstate solution; 2. regulating pH of the reactant solution to 0.8-2.0; 3. adding n-propanol to the solution and homogenizing the reactant system through stirring for 2-6 hr; 4. setting the reaction system in a hydrothermal kettle for hydrothermal reaction to obtain WO3 portions; 5. washing the powder; and 6. vacuum drying in a vacuum drying oven to obtain the weak excitant photochromic WO3 powder. The hybridized powder has raised photochromic reaction activity, fast bluing under the excitation of sunlight or low power ultraviolet ray, fast discoloring in no light condition and relaxed requirement on the light source for color change.

Description

technical field [0001] The present invention relates to photochromic WO 3 The preparation method of powder, especially relates to a kind of using n-propanol hybridization to prepare weak excitation (low power ultraviolet excitation or sunlight excitation) photochromic WO 3 powder method. Background technique [0002] The so-called photochromism refers to the reversible change of a substance between two physical or chemical states, at least one of which is caused by light radiation. Photochromism can be observed in liquid, solid state, solution and crystal, and can also be observed in nature, such as photosynthesis of plants and visual process of animals. This material has many superior properties, such as being used as a filling color-changing agent for transparent interlayers to adjust the light transmittance of the target environment. At the same time, this material is also used in optical information and storage displays, military camouflage, and special smart windows. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68C09K9/00
Inventor 沈毅朱华黄荣胡国华张青龙
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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