Thermochromic vanadium dioxide powder and preparation method thereof

A vanadium dioxide, thermochromic technology, applied in vanadium oxide, chemical instruments and methods, color-changing fluorescent materials, etc., can solve the difficulty of adding vanadium dioxide single-phase crystalline powder, cannot fully meet the preparation requirements, and affect the reaction products. Chemical ratio and other issues, to achieve the effects of environmental protection, stable chemical state, improved comfort and energy saving

Inactive Publication Date: 2011-10-19
刘爱林 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above-mentioned patented technologies for the preparation and application of thermochromic vanadium dioxide powders, some preparation methods require the pre-synthesis of vanadium-containing oxide precursors and then high-temperature firing procedures (documents 1-3), Obviously, this process is complicated and includes high-temperature treatment, which will bring about large time and energy consumption
In the newly disclosed technology of preparing thermochromic vanadium dioxide powder by hydrothermal reaction (patent document 4), it is also necessary to pre-configure the solution containing vanadium ions, and then undergo hydrothermal reaction synthesis and other processes. The process is sophisticated and complex, requiring Precise control of parameters, and more time-consuming, cannot fully meet the large amount of fast and simple preparation requirements required by industrial production
Moreover, because the vanadium-containing compound and the solvent or reducing agent or additive will lose part of the gas during the mixing and dissolving process, thereby affecting the stoichiometric ratio of the reaction product, increasing the formation of the vanadium dioxide single-phase crystalline powder with a rutile structure. physical difficulties

Method used

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  • Thermochromic vanadium dioxide powder and preparation method thereof
  • Thermochromic vanadium dioxide powder and preparation method thereof
  • Thermochromic vanadium dioxide powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of the thermochromic vanadium dioxide powder provided in this embodiment is to weigh vanadyl oxalate hydrate (VOC 2 O 4 ·nH 2 O) 1.602 g, ammonium metavanadate (NH 4 VO 3 ) 0.882g, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction vessel at the same time with 50g of ice and seal it immediately, put it in a drying oven and heat it up to 270°C and keep it warm for 12 hours to take out. The reaction product was isolated by filtration and dried in an oven at 70°C for 12 hours to obtain the defined microparticles.

[0027] The powder X-ray diffraction analysis results of the determined particles are as follows figure 1 As shown, it is a single-phase crystal of vanadium dioxide with rutile structure; the powder electron microscope observation results of the determined particles are as follows figure 2 As shown, the single-phase crystalline powder of vanadium dioxide is monodispersed, the morphology is rod-like, and the minimu...

Embodiment 2

[0031] The preparation method of the thermochromic vanadium dioxide powder provided in this embodiment is to weigh vanadyl oxalate hydrate (VOC 2 O 4 ·nH 2 O) 0.830 g, ammonium metavanadate (NH 4 VO 3 ) 0.212 g, vanadium pentoxide (V 2 O 5 ) 0.335g, put it into a 25ml polytetrafluoroethylene-lined hydrothermal reaction vessel at the same time with 10g of ice and seal it immediately, and put it in a drying oven and heat it up to 220°C and take it out after keeping the temperature for 120 hours. After separation by filtration and drying at 70°C for 12 hours, the specified microparticles were obtained.

[0032] The powder X-ray diffraction analysis result of the obtained particles is a single crystal phase of vanadium dioxide with rutile structure, which is an aggregate and has a rod-like shape.

Embodiment 3

[0034] The preparation method of the thermochromic vanadium dioxide powder provided in this example is different from Example 1 in that: adding tungstic acid (H 2 WO 4 ) 0.035 g, the powder X-ray diffraction analysis result of the obtained particles is a vanadium dioxide single crystal phase with a rutile structure, which is an aggregate and has a rod-like appearance.

[0035] The obtained powder was uniformly dispersed on the transparent resin double-sided tape, and the double-sided tape was attached to a glass test piece with a thickness of 1 mm to obtain a dimming glass. The spectral transmission spectrum of the dimming glass was measured. The phase transition temperature of the high powder was determined to be 35°C from the temperature change of the near-infrared (wavelength 1 μm) transmittance.

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Abstract

The invention relates to thermochromic vanadium dioxide powder, which is characterized by being a monodispersed and / or aggregated rutile crystal with a rod-like and / or similar square morphology. The thermochromic vanadium dioxide powder provided by the invention has good phase transition properties near room temperature and appropriate granularity, and can be applied to intelligent energy-saving glass, intelligent energy-saving resin and the like. The invention also relates to a preparation method of the thermochromic vanadium dioxide powder.

Description

Technical field [0001] The invention relates to a thermochromic vanadium dioxide powder, which belongs to the field of inorganic functional powder materials for building energy conservation; the invention also relates to a preparation method of the above-mentioned thermochromic vanadium dioxide powder. Background technique [0002] Statistics show that the energy consumption of the construction industry accounts for nearly half of the total social energy consumption, and a considerable part of it is used for building air conditioners, and the heat loss of building air conditioners is mainly concentrated in openings such as glass windows. my country is adopting various types of energy-saving windows to reduce air-conditioning load and achieve the purpose of energy saving and emission reduction. Recently, it has been found that the rutile-structured vanadium dioxide is accompanied by the semiconductor-metal phase transition near room temperature, and the huge optical change of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C09K9/00
Inventor 刘爱林
Owner 刘爱林
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