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Vanadium oxide powder with high latent heat of phase change and preparation method thereof

A technology of latent heat of phase change and vanadium oxide, applied in the direction of vanadium oxide, chemical instruments and methods, heat exchange materials, etc., can solve the problems of poor phase change performance of products, achieve low cost, facilitate mass production, and low price Effect

Active Publication Date: 2019-11-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this technical approach, VO 2 (B) The powder preparation process window is wide, the operation is relatively simple, and it is easy to realize, but the annealed product often contains B-phase VO 2 Or lower valence vanadium oxide phase, resulting in poor phase transition performance of the product
[0006] VO for high thermochromic properties 2 The powder body has the above-mentioned problems existing in the preparation technology, and CN108892172A discloses a kind of VO with high phase change latent heat 2 The preparation method of the powder, which uses short-time oxygen atmosphere annealing and the compound annealing process after in-situ vacuum annealing to prepare high-purity M-phase VO 2 powder, thereby increasing the latent heat of phase change of the powder, but the produced VO 2 The latent heat of phase change of the powder does not exceed 40J / g

Method used

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  • Vanadium oxide powder with high latent heat of phase change and preparation method thereof
  • Vanadium oxide powder with high latent heat of phase change and preparation method thereof
  • Vanadium oxide powder with high latent heat of phase change and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Get 0.335g vanadium pentoxide and 0.249g anhydrous oxalic acid, add 35ml deionized water, stir at room temperature for 1 hour, then add 0.013g polyvinylpyrrolidone (PVP) and stir for 15 minutes to obtain PVP, vanadium pentoxide and oxalic acid Uniform precursor dispersions with mass concentrations of 0.037%, 0.94% and 0.70%, respectively. The dispersion liquid was added to a 100ml p-polyphenol (PPL) liner, and then the liner was placed in a reaction kettle, and then hydrothermally reacted at 220° C. for 8 hours. After the hydrothermal reaction was completed, it was cooled to room temperature. After the reaction suspension was centrifuged and washed in a high-speed centrifuge. The obtained product was then dried in an oven at 50°C for 20 hours to obtain PVP-modified nano-VO 2 (B) powder (denoted as VO 2 (B)-PVP-1).

[0070] Weigh 0.2g of VO prepared above 2 (B) The powder is placed in a tube furnace, and the powder is degassed for 80 minutes in a low vacuum with an ...

Embodiment 2

[0077] Get 0.364g vanadium pentoxide and 0.378g oxalic acid dihydrate, add 40ml deionized water, stir at room temperature for 2 hours, then add 0.017g polyvinylpyrrolidone (PVP) and stir for 10 minutes to obtain PVP, vanadium pentoxide and oxalic acid Uniform precursor dispersions with mass concentrations of 0.042%, 0.89% and 0.66%, respectively. The dispersion liquid was added to a 100ml p-polyphenol (PPL) liner, and then the liner was placed in a reaction kettle, and then hydrothermally reacted at 240° C. for 4 hours. After the hydrothermal reaction was completed, it was cooled to room temperature. After the reaction suspension was centrifuged and washed in a high-speed centrifuge. The obtained product was then dried in an oven at 80°C for 12 hours to obtain PVP-modified nano-VO 2 (B) powder (denoted as VO 2 (B)-PVP-2).

[0078] Weigh 0.2g of VO prepared above 2 (B) The powder is placed in a tube furnace, and the powder is degassed for 30 minutes in a low vacuum with an...

Embodiment 3

[0084] Get 0.345g vanadium pentoxide and 0.359g dihydrate oxalic acid, add 45ml deionized water, stir at room temperature for 3 hours, then add 0.022g polyvinylpyrrolidone (PVP) and stir for 15 minutes to obtain PVP, vanadium pentoxide and oxalic acid Uniform precursor dispersions with mass concentrations of 0.048%, 0.75% and 0.56%, respectively. The dispersion liquid was added to a 100ml p-polyphenol (PPL) lining, and then the lining was placed in a reaction kettle, and then hydrothermally reacted at 230°C for 6h. After the hydrothermal reaction was completed, it was cooled to room temperature. After the reaction suspension was centrifuged and washed in a high-speed centrifuge. The resulting product was then dried in an oven at 70°C for 16 hours to obtain PVP-modified nano-VO 2 (B) powder (denoted as VO 2 (B)-PVP-3).

[0085] Weigh 0.2g of VO prepared above 2 (B) The powder is placed in a tube furnace, and the powder is degassed for 80 minutes in a low vacuum with an air...

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Abstract

The invention discloses a vanadium oxide powder with high latent heat of phase change and a preparation method thereof, belonging to the technical field of thermochromic materials. The preparation method of the invention comprises the following steps: with vanadium pentoxide, oxalic acid and PVP as starting materials, preparing PVP-modified B-phase VO2 nanopowder by using a hydrothermal synthesisprocess; and then, subjecting the PVP-modified B-phase VO2 nanopowder to annealing at high temperature in oxygen atmosphere to prepare the vanadium oxide powder with high latent heat of phase change.The powder of the invention is composed of M-phase VO2 and V6O13, wherein the percentage content of phase V6O13 is 1-4%, and the percentage content of the M-phase VO2 is 96-99%. The latent heat of phase change of the powder is more than 50 J / g. Compared with traditional vanadium oxide powder prepared through vacuum annealing and free of the addition of PVP, the latent heat of phase change of the vanadium oxide powder prepared in the invention is at least increased by 60%. The preparation method provided by the invention has the advantages of mild reaction conditions, simple operation, low energy consumption and low cost, and is favorable for batch preparation.

Description

technical field [0001] The invention relates to the technical field of thermochromic materials, in particular to a vanadium oxide powder with high phase change latent heat characteristics and a preparation method thereof. Background technique [0002] Thermochromic coating is an intelligent thermal control coating, which can automatically adjust the thermal control parameters of the material itself to sunlight transmittance according to the temperature change of the coating, so as to achieve the thermal control technology of controlling the temperature of the object. Its core is Thermochromic material. At present, in the application of thermochromic coating technology, the thermochromic materials that have been studied mainly include VO 2 Inorganic phase change materials represented by liquid crystals or polymer materials represented by thermosensitive polymers. Among them, VO 2 Thermochromic coatings have good transparency, low preparation cost, reversible phase change, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02C09K5/06
CPCC01G31/02C09K5/063C01P2006/32C01P2002/72C09D139/04C08K3/22C01P2002/70C08L39/06
Inventor 李亚涛顾德恩林丽成马永海蒋亚东袁凯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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