CN111057263A - Vanadium dioxide composite flexible film with organic layer protection function and preparation and application thereof - Google Patents

Vanadium dioxide composite flexible film with organic layer protection function and preparation and application thereof Download PDF

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CN111057263A
CN111057263A CN201911407281.1A CN201911407281A CN111057263A CN 111057263 A CN111057263 A CN 111057263A CN 201911407281 A CN201911407281 A CN 201911407281A CN 111057263 A CN111057263 A CN 111057263A
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vanadium dioxide
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flexible film
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organic
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李静波
王丹
金海波
常晴峰
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Beijing Institute of Technology BIT
Chongqing Innovation Center of Beijing University of Technology
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Chongqing Innovation Center of Beijing University of Technology
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Abstract

The invention provides a preparation method of a vanadium dioxide composite flexible film with an organic layer protection function, and belongs to the technical field of composite film materials. The method comprises the following steps: dispersing vanadium dioxide nano powder into an organic reagent I to obtain a dispersion liquid, dissolving polyacrylonitrile into an organic reagent II to obtain a transparent solution, mixing the dispersion liquid and the transparent solution to obtain vanadium dioxide slurry, coating the vanadium dioxide slurry on a base material, and drying to obtain a vanadium dioxide thin film; and dissolving thermoplastic polyurethane in an organic reagent III, stirring and dissolving, coating the thermoplastic polyurethane solution on the surface of the vanadium dioxide film, and drying to obtain the vanadium dioxide composite flexible film protected by the organic layer. The composite flexible film prepared by the method provided by the invention has an organic protective layer, can slow down the oxidation of vanadium dioxide nano particles, effectively avoids the problem of intelligent temperature control failure of the film caused by the oxidation of vanadium dioxide nano powder, and can be applied to the surfaces of building materials, glass, vehicle windows, walls, metals and agricultural greenhouses.

Description

Vanadium dioxide composite flexible film with organic layer protection function and preparation and application thereof
Technical Field
The invention belongs to the technical field of composite film materials, and particularly relates to a vanadium dioxide composite flexible film with an organic layer protection function, and preparation and application thereof.
Background
According to survey results, the electricity consumption of the Chinese residential and commercial air conditioners accounts for 34% of the electricity consumption of the global air conditioners and 9.6% of the total electricity consumption of the national society. The window is a main channel for exchanging energy between the building and the outside, and accounts for 50% of the energy exchange between the building and the outside, so that the energy conservation of the window is a key link for building energy conservation.
Vanadium dioxide (VO)2) The metal oxide is a metal oxide with phase change property, reversible semiconductor phase-metal phase transition occurs at 68 ℃, the phase change process is accompanied with the drastic change of optical and electrical properties, and especially in the infrared band range, the infrared transmittance before and after the phase change changes by 70%. According to the characteristic, the vanadium dioxide material can intelligently respond to the change of environmental temperature to realize the transmission and reflection of sunlight, and when the temperature is below the phase change temperature, infrared light can transmit VO2The film enters the window, and the temperature in the window is increased; VO when the temperature rises above the phase transition temperature2The phase transition of the insulator metal occurs, so that the infrared transmittance is reduced and the temperature in the window is reduced. Thus, VO2The intelligent window of the film can intelligently maintain the ambient temperature in the window while meeting the lighting requirement in the window, and is suitable for being used as an ideal material for automatically regulating and controlling the indoor temperature of buildings, automobiles and the like.
The method for preparing the vanadium dioxide film comprises a vapor deposition method, a wet chemical precipitation method and an organic-inorganic composite method, wherein the organic-inorganic composite method is to obtain VO with excellent phase change performance2Slurry formed by dispersing nano particles into organic high-molecular mediumCoating the material on different substrates to form VO2A film. The preparation process has the advantages of simple process, low cost, higher universality and the like. But VO prepared using this method is currently used2Thin films face a series of challenges, the most important of which is the high quality VO in the thin film2The superfine powder is easy to be oxidized in the long-time use process, and the film fails to be used.
Disclosure of Invention
The invention aims to provide a simple and large-scale prepared composite flexible film for effectively protecting an organic layer of vanadium dioxide nano powder from losing efficacy due to oxidation, and a preparation method and application of the composite flexible film.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a vanadium dioxide composite flexible film protected by an organic layer comprises the following steps:
1) preparation of vanadium dioxide film
Dispersing vanadium dioxide nano powder into an organic reagent I to obtain a dispersion liquid, dissolving polyacrylonitrile into an organic reagent II to obtain a transparent solution, mixing the dispersion liquid and the transparent solution to obtain vanadium dioxide slurry, coating the vanadium dioxide slurry on a base material, and drying to obtain a vanadium dioxide thin film;
2) preparation of vanadium dioxide composite flexible film protected by organic layer
And dissolving thermoplastic polyurethane in an organic reagent III, stirring and dissolving to obtain a thermoplastic polyurethane solution, coating the thermoplastic polyurethane solution on the surface of the vanadium dioxide film, and drying to obtain the vanadium dioxide composite flexible film protected by the organic layer.
The vanadium dioxide nano powder used in the step 1) has good crystallinity, excellent stoichiometric ratio, good dispersibility and high chemical stability. The process for synthesizing the vanadium dioxide nano powder by solvent annealing in the reference document (Wang et al. Solar energy Mater Solar Cell 2019,200,110031.DOI: 10.1016/j.solmt.2019.110031) of the preparation method is concretely described. Of course, the preparation of the vanadium dioxide nanopowder can be realized by other conventional techniques in the art by those skilled in the art, or the vanadium dioxide nanopowder can be purchased directly on the market as long as the requirements of crystallinity, stoichiometric ratio, dispersibility and chemical stability can be met.
Further, the weight ratio of the vanadium dioxide nano powder to the polyacrylonitrile is 1: 300-1: 50; the weight ratio of the vanadium dioxide nano powder to the organic reagent I is 1: 1-1: 100, preferably 1: 15-1: 30, the vanadium dioxide nano powder with the proportion can be effectively dispersed in an organic solvent. The weight ratio of polyacrylonitrile to organic reagent II is 1: 1-1: 20, preferably 1: 5-1: 15. the weight ratio of the thermoplastic polyurethane to the organic reagent III is 1: 2-1: 10, preferably 1: 5-1: 8.
further, the organic reagent I and the organic reagent II are at least one of N, N-Dimethylacetamide (DMF), dimethyl sulfoxide (DMSO) and Dimethylacetamide (DMAC); the organic reagent III is at least one of DMF, butanone, cyclohexanone, acetone, ethyl acetate and toluene.
Further, the solid content of the vanadium dioxide nano powder in the vanadium dioxide slurry is 5% -20%, preferably 8% -15%, and the vanadium dioxide nano powder and polyacrylonitrile in the proportion can keep a good film forming effect and can achieve a good nano powder oxidation resistance result.
Further, in the step 1), the base material is selected from poly terephthalic acid plastic (PET plastic); the coating comprises modes of blade coating, roller coating, spraying and the like, and the coating thickness is 20-500 mu m; the drying temperature is 60-150 ℃.
Further, in the step 2), the dissolving temperature of the thermoplastic polyurethane is 60-80 ℃, and the stirring and dissolving time is 30-120 min; heating aids in the dissolution of the thermoplastic polyurethane. The coating thickness is 80-400 μm, preferably 100-300 μm; the drying temperature is 60-150 ℃.
Further, the vanadium dioxide slurry and the thermoplastic polyurethane solution can be coated after vacuum defoaming treatment.
Further, the vacuum defoaming treatment time is 20-40 min, and the vacuum defoaming treatment is carried out at room temperature.
The vanadium dioxide composite flexible film with the organic layer protection function is prepared by the method.
The utility model provides a vanadium dioxide composite flexible film of organic layer protection, the film is three layer construction's double-sandwich structure, includes thermoplasticity polyurethane layer, vanadium dioxide thin film layer and substrate layer.
The application of the vanadium dioxide composite flexible film with the organic layer protection function is to apply the film to the surfaces of building materials, glass, vehicle windows, walls, metal and agricultural greenhouses.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the preparation method of the composite flexible film, the coating prepared from the vanadium dioxide slurry has high transparency and high weather resistance and aging resistance, and the problem of intelligent temperature control failure of the film caused by oxidation of the vanadium dioxide nano powder can be effectively avoided.
2. The composite flexible film adopts the organic protective layer to further slow down the oxidation of the vanadium dioxide nano particles, and meanwhile, the organic protective layer has high transparency, has the functions of wear resistance and oil resistance, and prolongs the service life of the vanadium dioxide film;
3. the composite flexible film can be applied to the surfaces of building materials, vehicle windows, walls exposed to sunlight and metal surfaces, and can also be used as a heat-insulating film in an agricultural greenhouse, the film can intelligently adjust indoor and outdoor heat exchange, the utilization rate of an air conditioner is reduced, the energy consumption is reduced, and the emission of vanadium dioxide is reduced to protect the environment.
4. The preparation method of the composite flexible film has the characteristics of simple operation, simple film structure, low cost, low energy consumption and the like, and is beneficial to industrial production.
Drawings
FIG. 1 is a schematic structural diagram of a vanadium dioxide composite flexible film protected by an organic layer according to the present invention;
FIG. 2 is an X-ray diffraction (XRD) pattern of the vanadium dioxide nanopowder prepared in example 1;
FIG. 3 is a Scanning Electron Microscope (SEM) image of the vanadium dioxide nanopowder prepared in example 1;
FIG. 4 is a temperature-variable infrared test spectrum of the vanadium dioxide thin film prepared in example 1;
FIG. 5 is a temperature swing infrared test spectrum of the composite flexible film prepared in example 2;
FIG. 6 is a temperature swing infrared test spectrum of a composite flexible film prepared in example 3;
FIG. 7 is a temperature swing infrared test spectrum of a composite flexible film prepared in example 4;
FIG. 8 is a temperature swing infrared test spectrum of a composite flexible film prepared in example 5;
FIG. 9 is a temperature swing infrared test spectrum of a composite flexible film prepared in example 6;
reference numerals: 1-thermoplastic polyurethane layer, 2-vanadium dioxide film layer and 3-base material layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples product testing illustrates.
1. Ray diffraction analysis:
the test was carried out using an X-ray powder diffractometer model Rigaku-D/max-2550pc from Hitachi, Japan, using Cu-k α as radiation source and a wavelength of
Figure BDA0002348997680000051
Adopting a Ni filter plate, wherein the pipe flow is 40mA, the pipe pressure is 40KV, the scanning range is 10-90 degrees, the scanning speed is 8 degrees/min, and the step length is 0.02 degrees; respectively placing the samples into glass slides, flattening, embedding the glass slides into the center of an experimental groove of the instrument, and testing; phase identification and crystal structure information was analyzed by HighScore Plus software.
2. Observation by a scanning electron microscope:
and (3) carrying out microscopic morphology test on the sample by using a Hitachi S-4800 high-resolution field emission Scanning Electron Microscope (SEM).
3. Variable temperature infrared transmission test
After the vanadium dioxide iS coated into a film by spin coating, a variable temperature infrared transmission test iS carried out, the test temperature iS 20-90 ℃, and a test instrument iS a Nicolet iS50 Fourier transform infrared (FT-IR) spectrometer.
Example 1
Weighing 1.163g of vanadyl sulfate powder, dispersing into 20ml of deionized water, stirring for 20min at a constant temperature of 60 ℃ in a water bath, preparing a mixed solution of 0.3ml of hydrazine hydrate and 2.1ml of water, gradually dripping into the dissolved vanadyl sulfate solution, and simultaneously adjusting the pH to about 10 by using 1M sodium hydroxide aqueous solution to finally obtain brown suspension. The liquid is washed by deionized water for three times, the centrifugal speed is 12500r/min, the washed liquid is dispersed in 20ml of deionized water, the deionized water is put into a reaction kettle, and the temperature is raised to 240 ℃ in a forced air drier and kept for 48 hours. A black reaction product was obtained. Washing the black product obtained by the reaction twice by using deionized water, washing the black product twice by using ethanol, and drying the black product once in a vacuum drying oven at 60 ℃ for 12 hours to obtain loose black powder which is anoxic-state M-phase vanadium oxide.
50mg of oxygen-deficient vanadium dioxide is weighed out and dispersed in 10ml of DMF, and the mixture is dispersed uniformly by ultrasonic sound to form a suspension. Transferring the suspension into a quartz lining, simultaneously adding a hydrogen peroxide solution with a certain content into the polytetrafluoroethylene lining, then putting the quartz lining into the polytetrafluoroethylene lining to form a double-layer nested structure, putting the double-layer nested lining into a metal shell of a hydrothermal kettle, screwing down, and keeping the hydrothermal kettle at 280 ℃ in a forced air drying oven for 2 hours; and obtaining black suspension after the reaction is finished, and washing and vacuum drying the black suspension to obtain the solvent annealed vanadium dioxide nano powder.
Weighing 40mg of vanadium dioxide nano powder, ultrasonically dispersing the vanadium dioxide nano powder into 5ml of DMF (dimethyl formamide), simultaneously weighing 6g of polyacrylonitrile and 50ml of DMF, mixing and continuously stirring for 3h to obtain colorless transparent slurry, and mixing the vanadium dioxide nano powder dispersion liquid and the polyacrylonitrile transparent slurry, and continuously stirring for 24h at normal temperature to obtain the vanadium dioxide slurry. The vanadium dioxide film is coated on a PET substrate by a blade coating method, the coating thickness is 60 mu m, and the vanadium dioxide film is obtained after drying for 15min at 120 ℃.
The aging resistance test is carried out on the vanadium dioxide film which is not coated with the thermoplastic polyurethane protective layer, and the specific steps are as follows: and (3) sticking the vanadium dioxide film on a window, standing for three months under natural conditions, and carrying out variable-temperature infrared test analysis.
The vanadium dioxide nano powder prepared in the embodiment is tested and analyzed, and the result is as follows:
1. x-ray diffraction analysis:
as shown in fig. 2, the X-ray diffraction pattern of the vanadium dioxide nanopowder prepared in this example is consistent with the characteristic peak in JCPDS 43-1051, and thus it is known that the vanadium dioxide nanopowder prepared in this example is a monoclinic phase vanadium dioxide nanopowder.
2. Observation by a scanning electron microscope:
fig. 3 is a scanning electron microscope image of the vanadium dioxide nanopowder prepared in this example, from which it can be seen that the vanadium dioxide nanopowder is a uniformly distributed spheroidal particle with a particle size range of 30nm to 50 nm.
The results of the variable temperature infrared test analysis of the vanadium dioxide thin film prepared in this example and the vanadium dioxide thin film naturally used for three months are shown in fig. 4, and it can be seen from the graph that the variable temperature infrared modulation rate of the vanadium dioxide thin film just prepared reaches about 40% at 1500nm, and the vanadium dioxide thin film has excellent optical modulation performance. After three months, the performance of the film is seriously attenuated, and the variable temperature infrared modulation rate at 1500nm is about 10 percent.
From the optical transmittance change results, the vanadium dioxide film without the thermoplastic polyurethane protective layer is subject to failure after being used for a long time under the environmental condition, and the vanadium dioxide film cannot be applied in the actual life.
The following examples use the vanadium dioxide nanopowder prepared in this example.
Example 2
The vanadium dioxide film slurry prepared here was coated to a film thickness of 100 μm as in example 1.
4g of thermoplastic polyurethane is dissolved into 20ml of DMF at the temperature of 60 ℃, the thermoplastic polyurethane solution is cooled to room temperature after being completely dissolved, the solution is coated on the surface of the vanadium dioxide film in a blade mode, the coating thickness is 150 mu m, and the vanadium dioxide composite flexible film with the organic protective layer is obtained after the coating is dried for 10min at the temperature of 120 ℃.
The results of the temperature-variable infrared test analysis of the vanadium dioxide composite film prepared in this example and the vanadium dioxide composite film naturally used for three months are shown in fig. 5, and it can be seen from the graph that the temperature-variable infrared modulation rate of the just-obtained vanadium dioxide composite film at 1500nm reaches about 44%, and after three months, the film performance is basically unchanged, and the excellent optical modulation performance is still maintained. Meanwhile, the visible light transmittance of the vanadium dioxide composite film is not influenced by the 150-micron thermoplastic polyurethane film, which is very beneficial to the application of the vanadium dioxide composite film.
Example 3
30mg of vanadium dioxide nano powder is weighed and ultrasonically dispersed into 5ml of DMF, simultaneously 6g of polyacrylonitrile and 50ml of DMF are weighed and mixed and continuously stirred for 3h to obtain colorless transparent slurry, and the vanadium dioxide nano powder dispersion liquid and the polyacrylonitrile transparent slurry are mixed and continuously stirred for 24h at normal temperature to obtain the vanadium dioxide slurry. The vanadium dioxide film is coated on a PET substrate by a blade coating method, the coating thickness is 60 mu m, and the vanadium dioxide film is obtained after drying for 15min at 120 ℃.
6g of thermoplastic polyurethane is dissolved into 20ml of ethyl acetate at 70 ℃, the thermoplastic polyurethane solution is cooled to room temperature after being completely dissolved, the solution is coated on the surface of the vanadium dioxide film in a blade mode, the coating thickness is 120 mu m, and the vanadium dioxide composite flexible film with the organic protective layer is obtained after the coating is dried for 10min at 120 ℃.
The vanadium dioxide composite film prepared in this example was subjected to temperature-variable infrared test analysis, and the results were as follows:
the final product test result is shown in fig. 6, and it can be seen from the graph that the variable temperature infrared modulation rate reaches about 41% at the wavelength of 1500nm, and the optical modulation performance is excellent.
Example 4
Weighing 40mg of vanadium dioxide nano powder, ultrasonically dispersing the vanadium dioxide nano powder into 5ml of DMAC (dimethylacetamide), simultaneously weighing 5g of polyacrylonitrile and 30ml of DMAC, mixing and continuously stirring for 5h to obtain colorless transparent slurry, and mixing the vanadium dioxide nano powder dispersion liquid and the polyacrylonitrile transparent slurry, and continuously stirring for 24h at normal temperature to obtain the vanadium dioxide slurry. The vanadium dioxide film is coated on a PET substrate by a blade coating method, the coating thickness is 90 mu m, and the vanadium dioxide film is obtained after drying for 15min at 120 ℃.
6g of thermoplastic polyurethane is dissolved into 30ml of acetone at 60 ℃, the thermoplastic polyurethane solution is cooled to room temperature after being completely dissolved, the solution is coated on the surface of the vanadium dioxide film in a blade mode, the coating thickness is 100 mu m, and the vanadium dioxide composite flexible film with the organic protective layer is obtained after the coating is dried for 10min at 110 ℃.
The vanadium dioxide composite film prepared in this example was subjected to temperature-variable infrared test analysis, and the results were as follows:
the final product test result is shown in fig. 7, and it can be seen from the graph that the variable temperature infrared modulation rate reaches about 47% at the wavelength of 1500nm, and the optical modulation performance is excellent.
Example 5
Weighing 50mg of vanadium dioxide nano powder, ultrasonically dispersing the vanadium dioxide nano powder into 5ml of DMSO (dimethylsulfoxide), simultaneously weighing 6g of polyacrylonitrile and 40ml of DMSO, mixing and continuously stirring for 4 hours to obtain colorless transparent slurry, and mixing the vanadium dioxide nano powder dispersion liquid and the polyacrylonitrile transparent slurry, and continuously stirring for 24 hours at normal temperature to obtain vanadium dioxide slurry. The vanadium dioxide film is coated on a PET substrate by a blade coating method, the coating thickness is 120 mu m, and the vanadium dioxide film is obtained after drying at 130 ℃ for 10 min.
4g of thermoplastic polyurethane is dissolved into 30ml of cyclohexanone at the temperature of 60 ℃, the thermoplastic polyurethane solution is cooled to the room temperature after being completely dissolved, the solution is coated on the surface of the vanadium dioxide film in a blade mode, the coating thickness is 120 mu m, and the vanadium dioxide flexible composite film with the protective layer coated with the organic matter is obtained after the coating is dried for 15min at the temperature of 120 ℃.
The vanadium dioxide composite film prepared in this example was subjected to temperature-variable infrared test analysis, and the results were as follows:
the final product test result is shown in fig. 8, and it can be seen from the graph that the variable temperature infrared modulation rate reaches about 54% at the wavelength of 1500nm, and the optical modulation performance is excellent.
Example 6
Weighing 60mg of vanadium dioxide nano powder, ultrasonically dispersing the vanadium dioxide nano powder into 4ml of DMSO (dimethylsulfoxide), simultaneously weighing 5g of polyacrylonitrile and 30ml of DMSO, mixing and continuously stirring for 4h to obtain colorless transparent slurry, and mixing the vanadium dioxide nano powder dispersion liquid and the polyacrylonitrile transparent slurry, and continuously stirring for 24h at normal temperature to obtain vanadium dioxide slurry. The vanadium dioxide film is coated on a PET substrate by a blade coating method, the coating thickness is 60 mu m, and the vanadium dioxide film is obtained after drying for 15min at 120 ℃.
4g of thermoplastic polyurethane is dissolved into 20ml of DMF at the temperature of 60 ℃, the thermoplastic polyurethane solution is cooled to room temperature after being completely dissolved, the solution is blade-coated on the surface of the vanadium dioxide film, the coating thickness is 120 mu m, and the vanadium dioxide flexible composite film with the protective layer coated by the organic substance is obtained after drying for 15min at the temperature of 120 ℃.
The vanadium dioxide composite film prepared in this example was subjected to temperature-variable infrared test analysis, and the results were as follows:
the final product test result is shown in fig. 9, and it can be seen from the graph that the variable temperature infrared modulation rate reaches about 52% at the wavelength of 1500nm, and the optical modulation performance is excellent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A preparation method of a vanadium dioxide composite flexible film protected by an organic layer is characterized by comprising the following steps:
1) preparation of vanadium dioxide film
Dispersing vanadium dioxide nano powder into an organic reagent I to obtain a dispersion liquid, dissolving polyacrylonitrile into an organic reagent II to obtain a transparent solution, mixing the dispersion liquid and the transparent solution to obtain vanadium dioxide slurry, coating the vanadium dioxide slurry on a base material, and drying to obtain a vanadium dioxide thin film;
2) preparation of vanadium dioxide composite flexible film protected by organic layer
And dissolving thermoplastic polyurethane in an organic reagent III, stirring and dissolving to obtain a thermoplastic polyurethane solution, coating the thermoplastic polyurethane solution on the surface of the vanadium dioxide film, and drying to obtain the vanadium dioxide composite flexible film protected by the organic layer.
2. The method for preparing the vanadium dioxide composite flexible film with the organic layer protection function as claimed in claim 1, wherein the weight ratio of the vanadium dioxide nano powder to polyacrylonitrile is 1: 300-1: 50; the weight ratio of the vanadium dioxide nano powder to the organic reagent I is 1: 1-1: 100, respectively; the weight ratio of polyacrylonitrile to organic reagent II is 1: 1-1: 20; the weight ratio of the thermoplastic polyurethane to the organic reagent III is 1: 2-1: 10.
3. the method for preparing the vanadium dioxide composite flexible film with several layers of protection according to claim 1, wherein the organic reagent I and the organic reagent II are at least one of N, N-Dimethylacetamide (DMF), dimethyl sulfoxide (DMSO) and Dimethylacetamide (DMAC); the organic reagent III is at least one of DMF, butanone, cyclohexanone, acetone, ethyl acetate and toluene.
4. The method for preparing the vanadium dioxide composite flexible film with several layers of protection as claimed in claim 1, wherein the solid content of the vanadium dioxide nanopowder in the vanadium dioxide slurry is 5-20%.
5. The method for preparing the vanadium dioxide composite flexible film with several layers of protection according to claim 1, wherein in the step 1), the substrate is selected from poly-p-phthalic plastic; the coating comprises modes of blade coating, roller coating, spraying and the like, and the coating thickness is 20-500 mu m; the drying temperature is 60-150 ℃.
6. The preparation method of the vanadium dioxide composite flexible film with several layers of protection as claimed in claim 1, wherein in the step 2), the dissolution temperature of the thermoplastic polyurethane is 60-80 ℃, and the stirring dissolution time is 30-120 min; the coating thickness is 80-400 μm; the drying temperature is 60-150 ℃.
7. The method for preparing the vanadium dioxide composite flexible film with the organic layer protection function as claimed in claim 1, wherein the vanadium dioxide slurry and the thermoplastic polyurethane solution are subjected to vacuum defoaming treatment before being coated.
8. A vanadium dioxide composite flexible film protected by an organic layer, characterized in that the film is prepared by the method of any one of the preceding claims 1 to 7.
9. The organic layer-protected vanadium dioxide composite flexible film of claim 8, wherein the film is a three-layer double sandwich structure comprising a thermoplastic polyurethane layer, a vanadium dioxide film layer and a substrate layer.
10. The use of the organic layer protected vanadium dioxide composite flexible film according to claim 8, wherein the film is used for building materials, glass, vehicle windows, walls, metals, and agricultural greenhouse surfaces.
CN201911407281.1A 2019-12-31 2019-12-31 Vanadium dioxide composite flexible film with organic layer protection function and preparation and application thereof Pending CN111057263A (en)

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Application publication date: 20200424