Color-development-adjustable vanadium dioxide based thermochromic composite material and application thereof

A thermochromic material, a vanadium dioxide-based technology, applied in the field of composite films, can solve the problems of affecting the thermochromic properties of composite materials, adverse effects of publicity and promotion, reducing the total insolation adjustment rate, etc., so as to improve the anti-ultraviolet radiation. Stability and solar regulation rate, improve the stability of anti-ultraviolet radiation, improve the effect of solar energy regulation rate

Active Publication Date: 2019-04-05
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the main inventor of the above-mentioned technology, he also noticed that the above-mentioned vanadium dioxide temperature-controlled intelligent energy-saving window still has the following deficiencies: (1) It has a relatively high adjustment range for the solar infrared band, but it accounts for 50% of the total solar energy. The visible light band has almost no adjustment effect, which reduces the total insolation adjustment rate; (2) Since there is no obvious adjustment effect in the visible light band, this adjustment cannot be used to produce sufficient visual changes, which is not helpful for customers. Demonstration of powerful adjustment effect has a decisive adverse effect on product publicity and promotion; (3) It has a strong absorption effect on short-wavelength visible light, resulting in yellow coloration of the film
[0005] Patent 1 (China Publication No. CN105694615A) discloses that a Ligand Exchange Thermochromic (LETC for short) material is compounded with a vanadium dioxide-based thermochromic material, which realizes high and low temperature sensitivity to visible light and infrared light spectrum. Reversible adjustment, however, the LETC material contains volatile components such as organic alcohols, which are prone to volatilization and failure during production and daily use, thus affecting the thermochromic performance of the composite material. In addition, the discoloration of the LETC material depends on thermal drive
Patent 2 (Chinese Publication No. CN108300002A) adopts the method of replacing organic alcohols with ionic liquids. Although the LETC containing hydroxyl ionic liquids has the advantages of non-volatility, high heat resistance and good chemical stability, the ionic liquids are not stable at room temperature or close to room temperature. It is liquid under low temperature, also known as low-temperature molten salt, which cannot be solidified, which seriously limits its practical use

Method used

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  • Color-development-adjustable vanadium dioxide based thermochromic composite material and application thereof
  • Color-development-adjustable vanadium dioxide based thermochromic composite material and application thereof
  • Color-development-adjustable vanadium dioxide based thermochromic composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh 0.1g of vanadium dioxide particles (30-60nm in particle size) and ultrasonically disperse them in 2g of ethanol to form a 5wt% dispersion, then add 4g of silicone resin to it, and form a uniform slurry by magnetic stirring. Apply it on the substrate (glass, etc.), leave it at room temperature for 2 hours to cure (it can also be heated in an oven to accelerate its curing), and obtain a vanadium dioxide-based thermochromic film, which is yellow and has a thickness of 80 μm.

[0057] The photosensitive powder that absorbs ultraviolet light and turns blue uses toluene as a solvent to form a 3wt% dispersion by ball milling, takes 2g of the dispersion and adds 2.5g of polycrystalline resin and 1g of silicone resin to it, and magnetically stirs to form a uniform slurry. And scrape-coat it on the pre-prepared vanadium dioxide-based thermochromic film, and after it is cured, the color of the film (with a total thickness of 200 μm) will change from yellow to blue under sunli...

Embodiment 2

[0059] Add vanadium dioxide particles according to the mass ratio: photosensitive powder=2:1 and add in the ball mill, use toluene as solvent and mix with appropriate dispersant, obtain the mixed dispersion liquid containing vanadium dioxide-based thermochromic composite material, its concentration is respectively 5wt% and 2.5wt%, then take 2g of the dispersion and add 4g of silicone resin to it, form a uniform slurry by magnetic stirring, apply it on the substrate by scraping, and wait for it to solidify to obtain a thickness of 120μm Vanadium dioxide-based thermochromic composite film.

Embodiment 3

[0061] Prepare a vanadium dioxide-based thermochromic film according to Example 1, with a thickness of 80 μm;

[0062] Use toluene as a solvent to form a 3wt% dispersion by ball milling the photosensitive powder that absorbs ultraviolet light and turns blue. Take 0.5, 1, 3, and 4 g of the dispersion, and add 2.5 g of polycrystalline resin and 1 g of silicone resin to it, magnetically Stir to form a uniform slurry, and scrape-coat it on the pre-prepared vanadium dioxide-based thermochromic film to obtain a film with adjustable depth of discoloration (the total thickness is 200 μm).

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Abstract

The invention relates to a color-development-adjustable vanadium dioxide based thermochromic composite material and application thereof. The vanadium dioxide based thermochromic composite material comprises a vanadium dioxide based thermochromic material and an ultraviolet photochromic material, wherein a mass ratio of the vanadium dioxide based thermochromic material to the ultraviolet photochromic material is 1:(0.1-2) and is 5:1-2:1 preferably.

Description

technical field [0001] The invention relates to a vanadium dioxide-based thermochromic composite material with adjustable color development and its application, in particular to the adjustment and application of the color development of a vanadium dioxide-based thermochromic material thin film, and belongs to the technical field of composite membranes. Background technique [0002] The problem of global energy shortage is becoming more and more serious, and excessive carbon emissions are causing the environment to deteriorate day by day. Energy conservation and emission reduction have become the top priority of all countries. It is estimated that building energy consumption accounts for more than 1 / 3 of the total energy consumption in society. Therefore, promoting building energy conservation is one of the key measures for energy conservation, emission reduction and sustainable development. A large part of building energy consumption is used for air conditioning, and glass w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D5/26C09D7/61C08J7/04
CPCC08J2383/04C08J2483/04C09D5/26C09D183/04C09D7/61C08J7/0427C08K3/22
Inventor 纪士东赵书文金平实黄爱彬周奕杰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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