Intelligent curtain and preparation method thereof

Abstract

The application discloses an intelligent curtain and a preparation method thereof. The intelligent curtain takes a flexible transparent material with thermal expansion and contraction performance as a base layer, and a thermochromic layer is compounded on the surface of the base layer. The thermal expansion coefficients of the base layer and the thermochromic layer are different. Based on the difference in the thermal expansion coefficients, the intelligent curtain can deform according to illumination or temperature to change the shielding of outdoor light. The thermochromic layer of the intelligent curtain can also change the light transmittance of the intelligent curtain according to illumination or temperature. The intelligent curtain has fast photo-thermal response performance and excellent sunlight modulation capacity, can modulate the sunlight entering the indoor, and thus adjusts the room temperature. The intelligent curtain itself has no energy consumption, the preparation process is simple, the cost is low, and the intelligent curtain is more easily obtained, and thus meets the actual needs of application to the curtain and outdoor sunlight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to an intelligent curtain and a preparation method thereof. BACKGROUND

[0002] With the wide use of intelligent curtains, various electric intelligent curtains emerge in endlessly. The principle is to open or close more conveniently through timing or remote control, thereby improving the use experience of users. However, the research on non-electric intelligent curtains is still less. The working mechanism is to change the shape and color of the body in response to the external light intensity or temperature through a light-heat actuator, so as to control the sunlight entering the indoor through the window. It not only has the effect of adjusting the indoor temperature, but also helps to reduce the indoor energy consumption. For example, in the hot summer, the indoor temperature can be reduced by using this non-electric intelligent curtain, thereby reducing the demand for air conditioning.

[0003] In the prior art, there is a self-coiling nanometer film that can spontaneously and reversibly switch between coiling and stretching states with temperature changes. However, the preparation cost of this micrometer-level film sample is high and difficult, which cannot meet the actual needs of application in curtains. There is also a light-heat actuator based on a shape memory substrate that can deform after being heated after absorbing light. However, it has good effect only under the stimulation of light in a certain wave band, and it is difficult to be applied to sunlight in actual outdoor environment. Therefore, the current technology related to non-electric intelligent curtains cannot meet the actual needs. How to obtain a curtain that can spontaneously deform according to temperature changes and control the sunlight entering the indoor to adjust the room temperature has become a problem to be solved. SUMMARY

[0004] Based on the above problems, the present application provides an intelligent curtain and a preparation method thereof, which has a fast light-heat response performance, can spontaneously change the shape according to the environmental light intensity or temperature, and has excellent sunlight modulation capacity, can modulate the sunlight entering the indoor, thereby adjusting the room temperature.

[0005] The present application discloses an intelligent curtain,

[0006] The intelligent curtain takes a flexible transparent material with thermal expansion and contraction performance as a substrate layer, and a thermochromic layer is compounded on the surface of the substrate layer.

[0007] The thermal expansion coefficients of the substrate layer and the thermochromic layer are different, and the intelligent curtain combines the difference in thermal expansion coefficients to deform according to light or temperature.

[0008] The thermochromic layer changes the light transmittance of the intelligent curtain according to light or temperature.

[0009] Optionally, the flexible transparent material includes polyethylene and polyester.

[0010] Optionally, the thermochromic layer comprises bacterial cellulose and tungsten-doped vanadium dioxide nanowires.

[0011] Optionally, when the bacterial cellulose and the tungsten-doped vanadium dioxide nanowires are co-assembled, the volume ratio of the bacterial cellulose dispersion solution and the tungsten-doped vanadium dioxide nanowire solution used is 1:0.025 to 1:0.25.

[0012] Optionally, the volume ratio is 1:0.05 to 1:0.1.

[0013] Optionally,

[0014] The concentration of the bacterial cellulose dispersion solution is 0.111 g / mL.

[0015] The concentration of the tungsten-doped vanadium dioxide nanowire solution is 0.010 g / mL.

[0016] Optionally,

[0017] The diameter of the bacterial cellulose is 50-100 nm, and the length of the bacterial cellulose is 20 μm.

[0018] The diameter of the tungsten-doped vanadium dioxide nanowire ranges from 100 to 280 nm, and the length of the tungsten-doped vanadium dioxide nanowire ranges from 15 to 30 μm.

[0019] Optionally,

[0020] The thickness of the thermochromic layer is greater than the diameter of the tungsten-doped vanadium dioxide nanowire.

[0021] The thickness of the base layer is less than or equal to 100 μm.

[0022] Optionally, the mole fraction of tungsten elements doped in the tungsten-doped vanadium dioxide nanowire ranges from 2 to 7%.

[0023] Optionally,

[0024] The thickness of the thermochromic layer is greater than or equal to 20 μm.

[0025] The thickness of the base layer is 50 μm.

[0026] Based on the above-mentioned intelligent window curtain, the application further discloses a preparation method of an intelligent window curtain, which is used for preparing the above-mentioned intelligent window curtain, and the preparation method comprises the following steps:

[0027] The bacterial cellulose is added into deionized water to prepare a bacterial cellulose dispersion solution;

[0028] The tungsten-doped vanadium dioxide nanowire solution is added into the bacterial cellulose dispersion solution, and stirring is performed to form a uniform mixed solution.

[0029] vacuum filtration to obtain a thermochromic layer;

[0030] transferring the thermochromic layer to a substrate layer to obtain an intelligent curtain.

[0031] Optionally, after the vacuum filtration of the mixed solution to obtain the thermochromic layer, the preparation method further comprises:

[0032] placing the thermochromic layer on a heating table for constant temperature treatment to remove residual moisture in the thermochromic layer.

[0033] Optionally, after obtaining the intelligent curtain, the preparation method further comprises:

[0034] pre-curling the intelligent curtain and wrapping an aluminum foil layer outside the intelligent curtain;

[0035] placing the wrapped intelligent curtain into an oven for shaping;

[0036] removing the aluminum foil after the intelligent curtain is shaped.

[0037] The present application discloses an intelligent curtain and a preparation method thereof. The intelligent curtain uses a flexible transparent material with thermal expansion and contraction performance as a substrate layer, and a thermochromic layer is compounded on the surface of the substrate layer. The thermal expansion coefficients of the substrate layer and the thermochromic layer are different. Based on the difference in thermal expansion coefficients, the intelligent curtain can deform according to light or temperature to change the shading of outdoor light. The thermochromic layer of the intelligent curtain can also change the light transmittance of the intelligent curtain according to light or temperature. The intelligent curtain described in the present application has fast photo-thermal response performance and excellent solar light modulation capability, can modulate the sunlight entering the indoor, and thus adjust the room temperature. Moreover, the intelligent curtain itself has no energy consumption, the preparation process is simple, the cost is low, and it is easier to obtain, which meets the actual needs of being applied to curtains and outdoor sunlight. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0039] Figure 1 a schematic diagram of an intelligent curtain disclosed by an embodiment of the present application;

[0040] Figure 2a a schematic diagram of the difference in thermal expansion coefficients of the substrate layer and the thermochromic layer disclosed by an embodiment of the present application;

[0041] Figure 2b The transmittance change schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0042] Figure 2c The flowchart of the preparation method of the smart curtain disclosed in the embodiment of the present application;

[0043] Figure 2d The SEM cross-section schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0044] Figure 2e The SEM front surface schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0045] Figure 2f The actual object schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0046] Figure 2g The light stimulation response schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0047] Figure 2h The light-heat actuation performance schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0048] Figure 2i The stability schematic diagram of the solar light transmittance of the smart curtain disclosed in the embodiment of the present application;

[0049] Figure 2j The outdoor test result schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0050] Figure 2k The outdoor test result schematic diagram of the smart curtain disclosed in the embodiment of the present application;

[0051] Figure 2l The schematic diagram of the smart curtain adjusting the chamber temperature disclosed in the embodiment of the present application. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0053] Embodiment one: the present application discloses a smart curtain.

[0054] Specifically, please refer to Figure 1 the present application discloses a smart curtain,

[0055] The intelligent curtain 100 takes a flexible transparent material with thermal expansion and contraction performance as a base layer 101, and a thermochromic layer 102 is compounded on the surface of the base layer.

[0056] In the intelligent curtain 100 described in the embodiment, the flexible transparent material includes polyethylene (PE) and polyester (PET). The base layer 101 can be in the form of a PE tape and a PET tape. In the embodiment, the flexible transparent material needs to have obvious thermal expansion and contraction effect, and other aspects of the flexible transparent material are not specifically limited, and can be selected by a person skilled in the art according to actual needs. In the embodiment, the preferred flexible transparent material includes one or more of the PE tape and the PET tape, and the PE tape is most preferred. In the embodiment, the thickness of the base layer 101 is not specifically limited, and can be adjusted and selected by a person skilled in the art according to actual production conditions, performance and quality requirements of the base layer 101. In the embodiment, the thickness of the preferred base layer 101 is less than or equal to 100 μm, more preferably less than or equal to 80 μm, more preferably less than or equal to 60 μm, and most preferably 50 μm.

[0057] In the intelligent curtain 100 described in the embodiment, the thermochromic layer 102 includes bacterial cellulose and tungsten-doped vanadium dioxide nanowires. The thermochromic layer 102 can be obtained by co-assembly of bacterial cellulose dispersion and tungsten-doped vanadium dioxide nanowire solution. The bacterial cellulose dispersion and the tungsten-doped vanadium dioxide nanowire solution are mixed and stirred uniformly, and then poured into a vacuum filtration device for filtration. At this time, most of the water is removed through the filter paper, and the diameters of the bacterial cellulose and the tungsten-doped vanadium dioxide nanowires are greater than the pore size of the filter paper, so they do not pass through the filter paper but are accumulated on the filter paper, thereby forming the thermochromic layer 102.

[0058] In the embodiment, the volume ratio of the bacterial cellulose dispersion and the tungsten-doped vanadium dioxide nanowire solution used in the co-assembly is not specifically limited, and can be adjusted and selected by a person skilled in the art according to actual production conditions, performance and quality requirements of the thermochromic layer 102. In the embodiment, to improve the thermochromic performance of the thermochromic layer 102 and balance the light transmittance of the thermochromic layer 102, the volume ratio of the bacterial cellulose dispersion and the tungsten-doped vanadium dioxide nanowire solution can be 1:0.025 to 1:0.25, more preferably 1:0.05 to 1:0.2, and most preferably 1:0.05 to 1:0.1.

[0059] In the smart curtain 100 described in the embodiment, the concentration of the bacterial cellulose dispersion solution in the thermochromic layer 102 can be 0.111 g / mL, and the concentration of the tungsten-doped vanadium dioxide nanowire solution can be 0.010 g / mL. In the embodiment, the source of the bacterial cellulose dispersion solution and the tungsten-doped vanadium dioxide nanowire solution is not particularly limited, and can be prepared by a method known to those skilled in the art or purchased from the market.

[0060] In the smart curtain 100 described in the embodiment, the diameter of the bacterial cellulose in the bacterial cellulose dispersion solution can range from 50 to 100 nm, and the length of the bacterial cellulose can be 20 μm. The diameter of the tungsten-doped vanadium dioxide nanowire can range from 100 to 280 nm, and the length of the tungsten-doped vanadium dioxide nanowire can range from 15 to 30 μm. The mole fraction of tungsten doped in the tungsten-doped vanadium dioxide nanowire can range from 2 to 7%.

[0061] In the smart curtain 100 described in the embodiment, the thickness of the thermochromic layer 102 is not particularly limited, and can be adjusted and selected by those skilled in the art according to the actual production situation, the performance and quality requirements of the thermochromic layer 102. In the embodiment, the thickness of the thermochromic layer 102 is preferably greater than the diameter of the tungsten-doped vanadium dioxide nanowire, more preferably greater than or equal to 5 μm, more preferably greater than or equal to 10 μm, and most preferably greater than or equal to 20 μm.

[0062] The thermal expansion coefficients of the base layer 101 and the thermochromic layer 102 are different, and the smart curtain 100 deforms according to the light or temperature in combination with the difference in thermal expansion coefficients.

[0063] Thermal expansion effect is a very common phenomenon in nature. For example, a mercury thermometer can be prepared by using the property of mercury that its volume expands when heated. In the smart curtain 100 described in the embodiment, the thermal expansion coefficient of the base layer 101 is high, and the thermal expansion coefficient of the thermochromic layer 102 is low. When the two layers are heated due to light or ambient temperature change, the deformation of the base layer 101 is much larger than that of the thermochromic layer 102, thereby causing the smart curtain 100 to deform. Specifically, the thermal expansion effect can be measured by the thermal expansion coefficient. The commonly used coefficient is the linear expansion coefficient, which is the ratio of the length change of the material to be measured in a certain direction to the length of the material to be measured at a certain temperature per unit temperature change. Figure 2a A diagram showing the difference in thermal expansion coefficients of the base layer and the thermochromic layer disclosed in the embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, when the PE tape is used as the base layer 101 and the tungsten-doped vanadium dioxide nanowire is used as the thermochromic layer 102, there is a large difference in the thermal expansion coefficients of the PE tape and the tungsten-doped vanadium dioxide nanowire. As the temperature rises, the PE tape continuously and dramatically deforms, while the deformation of the tungsten-doped vanadium dioxide nanowire is very small. Figure 2a A diagram showing the difference in thermal expansion coefficients of the base layer and the thermochromic layer disclosed in the embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, when the PE tape is used as the base layer 101 and the tungsten-doped vanadium dioxide nanowire is used as the thermochromic layer 102, there is a large difference in the thermal expansion coefficients of the PE tape and the tungsten-doped vanadium dioxide nanowire. As the temperature rises, the PE tape continuously and dramatically deforms, while the deformation of the tungsten-doped vanadium dioxide nanowire is very small.

[0064] Tungsten-doped nanometer vanadium dioxide has excellent optical properties, mainly including adjustable transmittance characteristics of visible light and infrared light. In the smart curtain 100 described in the embodiment, the thermochromic layer 102 made of tungsten-doped vanadium dioxide nanowires can change the light transmittance of the smart curtain 100 according to light or temperature. Figure 2b The transmittance change diagram of the smart curtain disclosed in the embodiment of the application is shown in Figure 2b As shown, when the thermochromic layer 102 is made using 0.75 mL of tungsten-doped vanadium dioxide nanowire solution, the transmittance of the smart curtain 100 changes as the temperature rises. It can be seen that the transmittance of the smart curtain 100 is higher at a lower temperature (20°C), and the transmittance of the smart curtain 100 is lower at a higher temperature (50°C). Among them, the transmittance mainly changes is the transmittance of near-infrared light, which shows that the smart curtain described in the embodiment can excellently complete the task of adjusting the transmittance to modulate the light entering the indoor room in the face of normal outdoor environment outdoor light / visible light / sunlight.

[0065] Embodiment two: based on the smart curtain disclosed in the above embodiment, the embodiment corresponds to disclose a preparation method of a smart curtain, for preparing the above smart curtain. Please refer to Figure 2c , the preparation method of the smart curtain comprises:

[0066] Step 201: adding bacterial cellulose into deionized water to prepare a bacterial cellulose dispersion.

[0067] Among them, deionized water refers to pure water after removing ionic impurities. In the method described in the embodiment, deionized water is used as a solvent to obtain a bacterial cellulose dispersion.

[0068] Step 202: adding tungsten-doped vanadium dioxide nanowire solution into the bacterial cellulose dispersion and stirring to form a uniform mixed solution.

[0069] In the method described in the embodiment, the source of tungsten-doped vanadium dioxide nanowire solution is not particularly limited, which can be prepared by a method well known to those skilled in the art or purchased from the market. The preferred preparation method of tungsten-doped vanadium dioxide nanowire solution can be according to the synthesis method reported in the literature (Optical Materials, 2019, Vol. 97, page 109367) and using ethanol solution as a solvent.

[0070] Step 203: vacuum filtration of the mixed solution to obtain a thermochromic layer.

[0071] In the method described in this embodiment, the mixed solution is poured into a glass sand core filtering device with filter paper, and the thermochromic layer can be obtained by vacuum filtration for a period of time (e.g., 20 minutes). The purpose of this step is to remove the water in the mixed solution and make the liquid mixed solution into a solid thermochromic layer. The method described in this embodiment does not have specific limitations on the equipment for vacuum filtration technology, and any equipment known to those skilled in the art can be used, and the preferred equipment is a glass sand core filtering device.

[0072] After that, the thermochromic layer can also be placed on a heating table at a preset temperature (e.g., 60°C) for constant temperature treatment for a period of time (e.g., 3 hours), so as to better remove the remaining water in the thermochromic layer. The method described in this embodiment does not have specific limitations on the equipment for constant temperature treatment technology, and any equipment known to those skilled in the art can be used, and the preferred equipment is an electric heating constant temperature air drying oven.

[0073] In this embodiment, the method described does not have specific limitations on the time of vacuum filtration, the temperature and time of constant temperature treatment, and those skilled in the art can adjust and select according to the actual production situation, the state and quality requirements of the thermochromic layer.

[0074] Step 204: Transfer the thermochromic layer to the substrate layer to obtain an intelligent curtain.

[0075] In the method described in this embodiment, when the substrate layer is a PE adhesive tape, the thermochromic layer can be transferred from the filter paper to the PE adhesive tape by using the strong adhesion between the PE adhesive tape and the thermochromic layer, and the desired shape can be obtained by cutting and designing to obtain an intelligent curtain.

[0076] After that, the intelligent curtain can also be pre-crimped and wrapped with an aluminum foil on the outside of the intelligent curtain. The wrapped intelligent curtain is placed in an oven for shaping, and then the aluminum foil is removed after the intelligent curtain is shaped to obtain a shaped intelligent curtain. The method described in this embodiment does not have specific limitations on the shaping step, and those skilled in the art can adjust and select according to the actual production situation, the performance and quality requirements of the intelligent curtain. The preferred step is to place the wrapped intelligent curtain in an electric heating constant temperature air drying oven at 60°C for 12 hours for shaping.

[0077] Figure 2d The SEM cross-sectional schematic diagram of the intelligent curtain disclosed in the embodiments of the present application. The scanning electron microscope SEM is a large-scale analytical instrument, which is widely used to observe the morphology and composition of the surface ultrastructure of various solid substances. Figure 2d The double-layer structure of the thermochromic layer and the PE substrate is shown, indicating that the thermochromic layer has been successfully transferred to the substrate layer. Figure 2e The SEM front view schematic diagram of the intelligent curtain disclosed in the embodiments of the present application, Figure 2eThe close packing of tungsten-doped vanadium dioxide nanowires and bacterial cellulose is shown, which is conducive to improving the corresponding photo-thermal actuation performance. Figure 2f The physical schematic diagram of the smart curtain disclosed in the embodiment of the present application is shown, specifically the physical schematic diagram of the smart curtain prepared with 0.75 mL of tungsten-doped vanadium dioxide nanowire solution.

[0078] In the method described in the embodiment, the photo-thermal actuation performance of the smart curtain can be tested by a solar simulator. Figure 2g The light stimulation response schematic diagram of the smart curtain disclosed in the embodiment of the present application is shown in Figure 2g The smart curtain prepared with 1.0 mL of tungsten-doped vanadium dioxide nanowire solution is tested, which can rapidly increase the bending angle under light stimulation and quickly recover to the original state after losing the light stimulation. Figure 2h The photo-thermal actuation performance schematic diagram of the smart curtain disclosed in the embodiment of the present application is shown in Figure 2h The smart curtain prepared with 1.0 mL of tungsten-doped vanadium dioxide nanowire solution is tested, and the response of the smart curtain to light stimulation is more rapid and more intense with the increase of light intensity, which indicates that the photo-thermal actuation performance of the smart curtain is improved with the increase of light intensity.

[0079] In the method described in the embodiment, the stability performance of the smart curtain can be tested by a UV-Vis-NIR spectrophotometer. Figure 2i The stability schematic diagram of the solar light transmittance of the smart curtain disclosed in the embodiment of the present application is shown in Figure 2i It can be seen that the solar light transmittance of the smart curtain is relatively stable before and after discoloration in 50 days, which indicates that the solar light modulation ability of the smart curtain does not obviously decline, and the smart curtain can maintain good thermal discoloration stability with time and multiple uses.

[0080] In the method described in the embodiment, the performance of the smart curtain can be tested intuitively by outdoor testing. Figure 2j and Figure 2k The outdoor testing result schematic diagram of the smart curtain disclosed in the embodiment of the present application is shown. Among them, Figure 2j and Figure 2k In the above, the left small house window is configured with a smart curtain, and the right small house window is only a common glass window without a smart curtain. Figure 2j The time is nine o'clock in the morning, at which time the light intensity and temperature are relatively low, Figure 2k The time is two o'clock in the afternoon, at which time the light intensity and temperature are relatively high. As Figure 2j and Figure 2kAs shown, the smart curtain at 9:00 am is in a curled state, i.e., an unopened state. The smart curtain at 2:00 pm is in an extended state, i.e., an opened state. It is illustrated that the smart curtain can automatically control its state according to the light intensity and temperature. When the light intensity and temperature are low, the smart curtain is not opened. When the light intensity and temperature are high, the smart curtain is opened.

[0081] In the method described in the embodiment, the performance of the smart curtain can be tested by a multi-channel temperature tester and a chamber model. Figure 2l The schematic diagram of the smart curtain adjusting the temperature of the chamber disclosed in the embodiment of the present application is shown in FIG. 6. Figure 2l As shown, when the chamber is not configured with the smart curtain, the indoor blackbody temperature reaches 51℃ at about 15:30 pm, which is 22℃ higher than the indoor blackbody temperature at 9:00 am. When the chamber is configured with the smart curtain, the indoor blackbody temperature reaches 45℃ at about 15:30 pm, which is 16℃ higher than the indoor blackbody temperature at 9:00 am. It is proved that the smart curtain can spontaneously adjust the indoor temperature with the change of the ambient light intensity and temperature, and create a comfortable indoor living environment.

[0082] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0083] The steps of the methods or algorithms described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0084] The features described in the embodiments in the specification can be replaced with each other or combined, so as to enable or use the present application for those skilled in the art.

[0085] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An intelligent window curtain, characterized in that, the intelligent window curtain is made of a flexible transparent material with thermal expansion and contraction properties as a base layer, and a thermochromic layer is compounded on the surface of the base layer; the base layer and the thermochromic layer have different thermal expansion coefficients, and the intelligent window curtain deforms according to light or temperature by combining the difference in thermal expansion coefficients; the thermochromic layer changes the light transmittance of the intelligent window curtain according to light or temperature; the thermochromic layer comprises bacterial cellulose and tungsten-doped vanadium dioxide nanowires; when the bacterial cellulose and the tungsten-doped vanadium dioxide nanowires are co-assembled, the volume ratio of the bacterial cellulose dispersion solution and the tungsten-doped vanadium dioxide nanowire solution used is 1:0.025 to 1:0.25; the concentration of the bacterial cellulose dispersion solution is 0.111 g / mL; the concentration of the tungsten-doped vanadium dioxide nanowire solution is 0.010 g / mL.

2. The smart window shade of claim 1, wherein, The flexible transparent material comprises polyethylene and polyester.

3. The smart window shade of claim 1, wherein, The volume ratio of the bacterial cellulose dispersion solution and the tungsten-doped vanadium dioxide nanowire solution is 1:0.05 to 1:0.

1.

4. The intelligent window curtain of claim 1, characterized in that, the diameter of the bacterial cellulose is 50-100 nm, and the length of the bacterial cellulose is 20 µm; the diameter of the tungsten-doped vanadium dioxide nanowires ranges from 100 to 280 nm, and the length of the tungsten-doped vanadium dioxide nanowires ranges from 15 to 30 µm.

5. The intelligent window curtain of claim 1, characterized in that, the thickness of the thermochromic layer is greater than the diameter of the tungsten-doped vanadium dioxide nanowires; the thickness of the base layer is less than or equal to 100 µm.

6. The smart window treatment of claim 1, wherein, The molar fraction of tungsten elements doped in the tungsten-doped vanadium dioxide nanowires ranges from 2 to 7%.

7. The intelligent window curtain of claim 5, characterized in that, the thickness of the thermochromic layer is greater than or equal to 20 µm; the thickness of the base layer is 50 µm.

8. A method for manufacturing a smart curtain, characterized in that, A method for preparing the intelligent window curtain of any one of claims 1-7, the method comprising: adding bacterial cellulose to deionized water to prepare a bacterial cellulose dispersion solution; adding a tungsten-doped vanadium dioxide nanowire solution to the bacterial cellulose dispersion solution and stirring to form a uniform mixed solution; vacuum suction filtering the mixed solution to obtain a thermochromic layer; transferring the thermochromic layer to a base layer to obtain an intelligent window curtain.

9. The production method according to claim 8, characterized by, After vacuum suction filtering the mixed solution to obtain a thermochromic layer, the method further comprises: placing the thermochromic layer on a heating table for constant temperature treatment to remove the remaining moisture in the thermochromic layer.

10. The preparation method according to claim 8, characterized in that, After obtaining the intelligent window curtain, the method further comprises: pre-curling the intelligent window curtain and wrapping an aluminum foil layer on the outside of the intelligent window curtain; placing the wrapped intelligent window curtain in an oven for shaping; removing the aluminum foil after the intelligent window curtain is shaped.

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