Intelligent thermal insulation coating as well as preparation method and composition thereof

Abstract

The invention relates to the field of coatings, and discloses an intelligent thermal insulation coating and a preparation method and composition thereof, the composition comprises the following components by mass: 5-15% of cesium tungsten bronze slurry, 10-30% of vanadium dioxide slurry, 30-70% of a film-forming agent, 5-25% of a diluent and 0-10% of other auxiliary agents; wherein the cesium tungsten bronze slurry is prepared from the following components in percentage by mass: 10 to 30 percent of cesium tungsten bronze nano powder, 69 to 88 percent of a first solvent and 1 to 2 percent of a first dispersing agent, and the vanadium dioxide slurry is prepared from the following components in percentage by mass: 10 to 30 percent of vanadium dioxide nano powder, 69.5 to 88.5 percent of a second solvent and 0.5 to 1.5 percent of a second dispersing agent. The cesium tungsten bronze slurry and the vanadium dioxide slurry are blended to prepare the composite heat insulation coating, so that the coating has the advantages of the two heat insulation slurries, not only can realize high visible light transmittance and high infrared rejection rate, but also can bidirectionally adjust infrared light, and has the cost advantage compared with similar products, and meanwhile, the preparation method of the heat insulation coating is simple.

Description

TECHNICAL FIELD

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

[0002] Cesium tungsten bronze, represented by the chemical formula Cs x WO3 (0 < x < 0.33) is a compound with a special structure of oxygen octahedron, which has low resistivity and low-temperature superconductivity. In recent years, it has been found that the cesium tungsten bronze-based paint has good infrared barrier performance, and is expected to replace the existing ATO, ITO thermal insulation materials, and be applied as a good near-infrared thermal insulation material in the fields of automobiles and buildings. In the building industry, the cesium tungsten bronze paint coated on the building glass curtain wall can not only affect the transparency of the glass, but also effectively block the infrared radiation, reduce the indoor temperature, reduce the use of air conditioning, and reduce carbon emissions. In the field of automobile film, the transparent thermal insulation film prepared from the cesium tungsten bronze powder can effectively reduce the temperature in the car, so that the driver can also enjoy a comfortable driving environment in the hot summer. The difficulty in the preparation of the cesium tungsten bronze thermal insulation paint mainly lies in the preparation of the cesium tungsten bronze powder. There are various methods for preparing the powder, such as solid phase method, hydrothermal method, sol-gel method, etc. The preparation of the film or paint is relatively conventional.

[0003] The thermal insulation film prepared from the vanadium dioxide nano-powder has the characteristics of intelligent adjustment of infrared light, and can be applied to building glass or automobile film. In different seasons, the temperature inside and outside the room or the car can be dynamically adjusted. The main methods for preparing the vanadium dioxide film include coating method, magnetron sputtering method, and vapor deposition method.

[0004] The cesium tungsten bronze paint has excellent infrared barrier performance and visible light transmission performance. When the visible light transmission rate is above 80%, the infrared barrier rate can still be above 90%. However, the cesium tungsten bronze paint can only adjust the infrared light in one direction, and does not have the function of intelligent two-way adjustment of infrared light. Moreover, the preparation cost is high.

[0005] The vanadium dioxide-based thermal insulation paint can intelligently adjust the transmittance and reflectivity of infrared light with the increase and decrease of temperature, and the preparation cost is low. However, due to the thermochromic property of the vanadium dioxide powder, the powder itself has a certain color, which requires that the visible light transmittance of the vanadium dioxide-based film must be above 60% during use, on the basis of which the maximum infrared light reflectivity or barrier rate is obtained. In this case, it is difficult to ensure that both the visible light transmittance and the infrared light barrier rate can reach a high level. That is, the visible light transmittance and the infrared light barrier rate of the vanadium dioxide-based thermal insulation paint are difficult to balance, and at the same time meet the use requirements.

[0006] Therefore, the prior art still needs to be improved. SUMMARY

[0007] The main purpose of the present application is to provide an intelligent thermal insulation coating, a preparation method and a composition thereof, so as to solve the technical problems that the cesium tungsten bronze coating does not have the function of intelligent bidirectional adjustment of infrared light, and the visible light transmittance and infrared light blocking rate of the vanadium dioxide-based thermal insulation coating are difficult to simultaneously meet the use requirements.

[0008] According to one aspect of the present application, an intelligent thermal insulation coating composition is provided, which comprises, in terms of mass percentage, 5-15% of cesium tungsten bronze paste, 10-30% of vanadium dioxide paste, 30-70% of film-forming agent, 5-25% of diluent and 0-10% of other additives. In the cesium tungsten bronze paste, 10-30% of cesium tungsten bronze nanometer powder, 69-88% of first solvent and 1-2% of first dispersant are included; in the vanadium dioxide paste, 10-30% of vanadium dioxide nanometer powder, 69.5-88.5% of second solvent and 0.5-1.5% of second dispersant are included.

[0009] According to one embodiment of the present application, the film-forming agent comprises one or more of polyurethane resin, acrylic resin and alkyd resin; and / or The diluent comprises a mixture of isopropyl alcohol and ethanol in a volume ratio of (1.5-2.5):1; and / or The other additives comprise a leveling agent and / or a defoaming agent.

[0010] According to one embodiment of the present application, the leveling agent comprises polyether-modified polysiloxane; and the defoaming agent comprises modified polysiloxane and / or silicone-based defoaming agent.

[0011] According to one embodiment of the present application, the primary grain size of the cesium tungsten bronze nanometer powder is 20-30 nm; and / or The first solvent comprises ethanol; and / or The dispersant comprises silane coupling agent.

[0012] According to one embodiment of the present application, the vanadium dioxide nanometer powder comprises tungsten-doped vanadium dioxide nanometer powder, and the phase transition temperature of the vanadium dioxide nanometer powder is lower than 40℃; and / or The primary grain size of the vanadium dioxide nanometer powder is 20-30 nm; and / or The second solvent comprises isopropyl alcohol; and / or The second dispersant comprises silane coupling agent.

[0013] According to another aspect of the present application, a preparation method of the intelligent thermal insulation coating is provided, which comprises uniformly mixing the composition as described above to obtain the intelligent thermal insulation coating.

[0014] According to one embodiment of the present application, the mixing the composition uniformly comprises: adding the cesium tungsten bronze slurry drop by drop into the vanadium dioxide slurry during stirring, and then adding the film forming agent, the diluent and other auxiliaries, and then stirring and mixing uniformly.

[0015] According to one embodiment of the present application, the method further comprises preparing the cesium tungsten bronze slurry according to the following steps: adding the cesium tungsten bronze nano-powder into the first solvent and stirring for 10-20 min, and then adding the first dispersant and continuing to stir for 10-20 min to obtain a mixture; grinding the mixture for 1-3 h until the particle size D 50 of the mixture is less than 30 nm to obtain the cesium tungsten bronze slurry.

[0016] According to one embodiment of the present application, the method further comprises preparing the vanadium dioxide slurry according to the following steps: adding the vanadium dioxide nano-powder into the second solvent and stirring for 10-20 min, and then adding the second dispersant and continuing to stir for 10-20 min to obtain a mixture; grinding the mixture for 1-3 h until the particle size D 50 of the mixture is less than 30 nm to obtain the vanadium dioxide slurry.

[0017] According to another aspect of the present application, an intelligent thermal insulation coating is provided, which is prepared by the method described above.

[0018] In the technical solution of the present application, the cesium tungsten bronze slurry and the vanadium dioxide slurry are blended to form a composite thermal insulation coating, so that the coating has the advantages of both kinds of thermal insulation slurries, can realize high visible light transmittance and high infrared barrier rate, can bidirectionally adjust infrared light, has a cost advantage compared with similar products, and the blending method is simple, and different thermal insulation coatings with different optical properties can be blended according to different application fields and scenes or different product index requirements. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 a flow chart of a preparation method of an intelligent thermal insulation coating according to an embodiment of the present application is shown; Figure 2 a SEM image of a thermal insulation coating of embodiment 1 of the present application is shown; Figure 3 SEM image showing the thermal insulation coating of the present application embodiment 2; Figure 4 SEM image showing the thermal insulation coating of the present application embodiment 3. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the present application clearer, the present application embodiments are further described in detail below with reference to the accompanying drawings.

[0022] It should be noted that all the expressions of "first" and "second" in the present application embodiments are used to distinguish two same name but different entities or different parameters, and "first" and "second" are only for the convenience of description and should not be understood as a limitation of the present application embodiments. The subsequent embodiments will not be described one by one.

[0023] The present application provides an intelligent thermal insulation coating composition, which comprises, by mass percentage, 5-15% cesium tungsten bronze paste, 10-30% vanadium dioxide paste, 30-70% film-forming agent, 5-25% diluent and 0-10% other additives; wherein, by mass percentage, the cesium tungsten bronze paste comprises 10-30% cesium tungsten bronze nanopowder, 69-88% first solvent and 1-2% first dispersant, and the vanadium dioxide paste comprises 10-30% vanadium dioxide nanopowder, 69.5-88.5% second solvent and 0.5-1.5% second dispersant.

[0024] The present application uses 10-30% cesium tungsten bronze nanopowder and 10-30% vanadium dioxide nanopowder, which is beneficial to adjust the optical properties of the final thermal insulation coating to be suitable for various possible application scenarios. When 10% cesium tungsten bronze nanopowder and 10% vanadium dioxide nanopowder are used, the visible light transmittance is relatively high and the infrared blocking rate is relatively low, which is suitable for high transmittance application scenarios. When 30% cesium tungsten bronze nanopowder and 30% vanadium dioxide nanopowder are used, the visible light transmittance is relatively low and the infrared blocking rate is relatively high, which is suitable for high thermal insulation application scenarios. When the content of cesium tungsten bronze nanopowder and the content of vanadium dioxide nanopowder are less than 10% or more than 30%, the application scenarios will be limited.

[0025] In some embodiments, when used in cold regions, the coating composition comprises 5-10% cesium tungsten bronze paste; when used in hot regions, the coating composition comprises 10-15% cesium tungsten bronze paste. The cesium tungsten bronze paste is irreversible in terms of isolating infrared, has no phase change function and cannot dynamically adjust solar radiation energy, so relatively less cesium tungsten bronze paste is used in cold regions to isolate less energy, and relatively more cesium tungsten bronze paste is used in hot regions to isolate more energy.

[0026] The coating composition of the present application adopts cesium tungsten bronze slurry and vanadium dioxide slurry, compared with powder, the slurry is a coatable suspension system in which powder is dispersed in liquid, and is more suitable for applications such as thermal insulation coating and thermal insulation film.

[0027] In the technical scheme of the present application, the cesium tungsten bronze slurry and the vanadium dioxide slurry are compounded to form a composite thermal insulation coating, so that the coating has the advantages of both thermal insulation slurries, can realize high visible light transmittance and high infrared barrier rate, can bidirectionally adjust infrared light, and has a cost advantage compared with similar products. The compounding method of the present application is simple, and different thermal insulation coatings with different optical properties can be compounded according to different application fields and scenarios or different product index requirements. The coating of the present application can realize rapid large-scale commercial application, especially in the fields of building windows / glass curtain walls and automobile film.

[0028] In some embodiments, the film-forming agent includes one or more of polyurethane resin, acrylic resin, and alkyd resin.

[0029] In some embodiments, the diluent includes a mixture of isopropyl alcohol and ethanol in a volume ratio of (1.5-2.5):1. This ratio can combine the advantages of the two solvents to adjust the evaporation speed, solubility, safety, and cost, thereby obtaining an efficient, economical, and easy-to-use diluent.

[0030] In some embodiments, the other additives include a leveling agent and / or a defoaming agent.

[0031] In some embodiments, the leveling agent includes polyether-modified polysiloxane, and the defoaming agent includes modified polysiloxane and / or silicone-based defoaming agent.

[0032] In some embodiments, the primary grain size of the cesium tungsten bronze nanopowder is 20-30 nm.

[0033] In some embodiments, the first solvent includes ethanol. There are two advantages of using ethanol: first, ethanol does not react with cesium tungsten bronze nanopowder and has good compatibility; second, ethanol can be mixed and compounded with isopropyl alcohol in the vanadium dioxide slurry to achieve better results.

[0034] In some embodiments, the first dispersant includes a silane coupling agent.

[0035] In some embodiments, the vanadium dioxide nanopowder includes tungsten-doped vanadium dioxide nanopowder (W-VO2), and the phase transition temperature of the vanadium dioxide nanopowder is lower than 40℃. The phase transition temperature of the vanadium dioxide nanopowder is reduced by doping tungsten elements.

[0036] In some embodiments, the primary grain size of the vanadium dioxide nanopowder is 20-30 nm.

[0037] In some embodiments, the second solvent comprises an alcohol (e.g. isopropyl alcohol). All alcohols are compatible with vanadium dioxide powder, and the compatibility between isopropyl alcohol and vanadium dioxide nanopowder is the best, and it is easier to form a stable and uniform dispersion.

[0038] In some embodiments, the second dispersant comprises a silane coupling agent.

[0039] Reference Figure 1 The application also provides a preparation method of the intelligent thermal insulation coating, comprising: Step S1, preparing cesium tungsten bronze slurry; Step S2, preparing vanadium dioxide slurry; Step S3, mixing the composition comprising the cesium tungsten bronze slurry and the vanadium dioxide slurry uniformly to obtain the intelligent thermal insulation coating.

[0040] In some embodiments, the cesium tungsten bronze slurry is prepared by the following steps: adding cesium tungsten bronze nanopowder into a first solvent and stirring for 10-20 min, then adding a first dispersant and continuing to stir for 10-20 min to obtain a mixture; grinding the mixture for 1-3 h until the particle size D 50 of the mixture is less than 30 nm to obtain the cesium tungsten bronze slurry.

[0041] In some embodiments, the vanadium dioxide slurry is prepared by the following steps: adding vanadium dioxide nanopowder into a second solvent and stirring for 10-20 min, then adding a second dispersant and continuing to stir for 10-20 min to obtain a mixture; grinding the mixture for 1-3 h until the particle size D 50 of the mixture is less than 30 nm to obtain the vanadium dioxide slurry.

[0042] In some embodiments, the mixing of the composition uniformly comprises: adding the cesium tungsten bronze slurry drop by drop into the vanadium dioxide slurry during stirring, then adding a film-forming agent, a diluent and other additives, and then stirring and mixing uniformly.

[0043] The application also provides an intelligent thermal insulation coating prepared by the above method.

[0044] In summary, the technical scheme of the present application has the following beneficial effects: (1) The preparation method of the heat insulation slurry is simple and flexible to adjust. (2) The heat insulation coating obtained by the present application has high stability and good dispersibility, and can be stored for a long time. (3) The heat insulation coating obtained by the present application has high visible light transmittance and high infrared barrier rate, and can intelligently adjust infrared light in both directions, which can meet the application in the fields of building glass curtain walls, automobile film, agricultural film and the like. (4) The cost of the heat insulation coating obtained by the present application is greatly reduced compared with the coating made of ATO, ITO and the like in the market, and the optical performance is good compared with the coating made of single VO2, which is conducive to industrialization promotion.

[0045] The following will be described according to specific embodiments.

[0046] Example 1 The intelligent heat insulation coating composition contains, by mass percentage: cesium tungsten bronze slurry 5%, tungsten-doped vanadium dioxide slurry 30%, polyurethane resin 30%, diluent (a mixture of isopropyl alcohol and ethanol in a volume ratio of 2:1) 25%, and polyether modified polysiloxane 10%. The cesium tungsten bronze slurry contains: nano cesium tungsten bronze powder 30%, ethanol 69%, and silane coupling agent 1%; the tungsten-doped vanadium dioxide slurry contains: nano tungsten-doped vanadium dioxide powder 10%, isopropyl alcohol 88.5%, and silane coupling agent 1.5%.

[0047] The preparation method of the intelligent heat insulation coating comprises: Step 1, preparing cesium tungsten bronze slurry: taking a corresponding volume of ethanol solution, adding a corresponding mass of cesium tungsten bronze nano powder, magnetically stirring for 15 min, then adding a corresponding mass of silane coupling agent, continuing to magnetically stir for 15 min, then adding the material into a nano sand mill for grinding for 1-3 h, during the grinding process, sampling every 5 min, and measuring the particle size of the powder with a nano particle size instrument, when the particle size D 50 is less than 30 nm, it is determined as the grinding end point, and the nano cesium tungsten bronze slurry with good dispersibility is obtained.

[0048] Step 2, preparing tungsten-doped vanadium dioxide slurry: taking a corresponding volume of isopropyl alcohol solution, adding a corresponding mass of tungsten-doped vanadium dioxide nano powder, magnetically stirring for 15 min, then adding a corresponding mass of silane coupling agent, continuing to magnetically stir for 15 min, then adding the material into a nano sand mill for grinding for 1-3 h, during the grinding process, sampling every 5 min, and measuring the particle size of the powder with a nano particle size instrument, when the particle size D 50 is less than 30 nm, it is determined as the grinding end point, and the tungsten-doped vanadium dioxide slurry with good dispersibility is obtained.

[0049] Step 3, preparation of thermal insulation coating: under high speed stirring, the cesium tungsten bronze slurry is added dropwise into the tungsten-doped vanadium dioxide slurry, and then the polyurethane resin, diluent and polyether modified polysiloxane are added and stirred to obtain the intelligent thermal insulation coating. The SEM image of the prepared coating is shown in Figure 2 , Figure 2 No obvious particle agglomerates are observed in the coating, indicating that the coating is dense, uniform and has good dispersibility, and the coating is composed of nanoparticles, meeting the subsequent use requirements.

[0050] Example 2 The intelligent thermal insulation coating composition contains, by mass percentage: cesium tungsten bronze slurry 10%, tungsten-doped vanadium dioxide slurry 20%, acrylic resin 50%, diluent (a mixture of isopropyl alcohol and ethanol with a volume ratio of 2:1) 15%, and modified polysiloxane 5%. The cesium tungsten bronze slurry contains: nano cesium tungsten bronze powder 20%, ethanol 78.5%, and silane coupling agent 1.5%; the tungsten-doped vanadium dioxide slurry contains: nano tungsten-doped vanadium dioxide powder 20%, isopropyl alcohol 79%, and silane coupling agent 1%.

[0051] The preparation method of the intelligent thermal insulation coating comprises: Step 1, preparation of cesium tungsten bronze slurry: take a corresponding volume of ethanol solution, add a corresponding mass of cesium tungsten bronze nanopowder, magnetically stir for 15 min, then add a corresponding mass of silane coupling agent, continue to magnetically stir for 15 min, then add the material to a nano sand mill and grind for 1-3 h. During the grinding process, sample every 5 min, and measure the particle size of the powder with a nanoparticle size instrument. When the particle size D 50 is less than 30 nm, it is determined as the grinding endpoint, and a well-dispersed nano cesium tungsten bronze slurry is obtained.

[0052] Step 2, preparation of tungsten-doped vanadium dioxide slurry: take a corresponding volume of isopropyl alcohol solution, add a corresponding mass of tungsten-doped vanadium dioxide nanopowder, magnetically stir for 15 min, then add a corresponding mass of silane coupling agent, continue to magnetically stir for 15 min, then add the material to a nano sand mill and grind for 1-3 h. During the grinding process, sample every 5 min, and measure the particle size of the powder with a nanoparticle size instrument. When the particle size D 50 is less than 30 nm, it is determined as the grinding endpoint, and a well-dispersed tungsten-doped vanadium dioxide slurry is obtained.

[0053] Step 3, preparation of thermal insulation coating: under high speed stirring, the cesium tungsten bronze slurry is added dropwise into the tungsten-doped vanadium dioxide slurry, and then the polyurethane resin, diluent and polyether modified polysiloxane are added and stirred to obtain the intelligent thermal insulation coating. The SEM image of the prepared coating is shown in Figure 3 , Figure 3No obvious particle agglomeration is observed, indicating that a dense, uniform, and well-dispersed coating is obtained, which is composed of nanoparticles and meets the subsequent use requirements.

[0054] Example 3 The intelligent thermal insulation coating composition contains, by mass percentage, cesium tungsten bronze paste 15%, tungsten-doped vanadium dioxide paste 10%, alkyd resin 70%, and diluent (a mixture of isopropyl alcohol and ethanol at a volume ratio of 2:1) 5%. The cesium tungsten bronze paste contains nano cesium tungsten bronze powder 10%, ethanol 88%, and silane coupling agent 2%; the tungsten-doped vanadium dioxide paste contains nano tungsten-doped vanadium dioxide powder 30%, isopropyl alcohol 69.5%, and silane coupling agent 0.5%.

[0055] The preparation method of the intelligent thermal insulation coating comprises: Step 1, preparation of cesium tungsten bronze paste: take a corresponding volume of ethanol solution, add a corresponding mass of cesium tungsten bronze nanopowder, magnetically stir for 15 min, then add a corresponding mass of silane coupling agent, continue to magnetically stir for 15 min, then add the material to a nano sand mill and grind for 1-3 h. During the grinding process, sample every 5 min, and measure the particle size of the powder with a nanoparticle size instrument. When the particle size D 50 is less than 30 nm, it is determined as the grinding endpoint, and a well-dispersed nano cesium tungsten bronze paste is obtained.

[0056] Step 2, preparation of tungsten-doped vanadium dioxide paste: take a corresponding volume of isopropyl alcohol solution, add a corresponding mass of tungsten-doped vanadium dioxide nanopowder, magnetically stir for 15 min, then add a corresponding mass of silane coupling agent, continue to magnetically stir for 15 min, then add the material to a nano sand mill and grind for 1-3 h. During the grinding process, sample every 5 min, and measure the particle size of the powder with a nanoparticle size instrument. When the particle size D 50 is less than 30 nm, it is determined as the grinding endpoint, and a well-dispersed tungsten-doped vanadium dioxide paste is obtained.

[0057] Step 3, preparation of thermal insulation coating: during high-speed stirring, add the cesium tungsten bronze paste dropwise to the tungsten-doped vanadium dioxide paste, then add alkyd resin and diluent, and stir to mix uniformly to obtain the intelligent thermal insulation coating. The SEM image of the prepared coating is shown in Figure 4 , Figure 4 No obvious particle agglomeration is observed, indicating that a dense, uniform, and well-dispersed coating is obtained, which is composed of nanoparticles and meets the subsequent use requirements.

[0058] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary, and is not intended to mean that the scope of the embodiments disclosed by the present application (including claims) is limited to these examples; under the idea of the embodiments of the present application, the above embodiments or technical features among different embodiments can also be combined, and there are many other changes of different aspects of the embodiments of the present application as described above, which are not provided in details for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. An intelligent thermal insulation coating composition, characterized in that: Calculated by mass percentage, it contains: 5~15% cesium tungsten bronze slurry, 10~30% vanadium dioxide slurry, 30~70% film-forming agent, 5~25% diluent and 0~10% other additives; Specifically, the cesium tungsten bronze slurry contains, by mass percentage, 10-30% of cesium tungsten bronze nanopowder, 69-88% of a first solvent, and 1-2% of a first dispersant; the vanadium dioxide slurry contains, by mass percentage, 10-30% of vanadium dioxide nanopowder, 69.5-88.5% of a second solvent, and 0.5-1.5% of a second dispersant.

2. The composition according to claim 1, wherein The film-forming agent comprises one or more of polyurethane resin, acrylic resin and alkyd resin; and / or The diluent comprises a mixture of isopropyl alcohol and ethanol in a volume ratio of (1.5-2.5):1; and / or The other additives include leveling agents and / or defoaming agents.

3. The composition according to claim 2, wherein The leveling agent includes polyether-modified polysiloxane; the defoaming agent includes modified polysiloxane and / or an organosilicon defoaming agent.

4. The composition according to claim 1, wherein The primary grain size of the cesium tungsten bronze nanopowder is 20-30 nm; and / or The first solvent comprises ethanol; and / or The first dispersant includes a silane coupling agent.

5. The composition according to claim 1, wherein The vanadium dioxide nanopowder comprises tungsten-doped vanadium dioxide nanopowder, and the phase transition temperature of the vanadium dioxide nanopowder is lower than 40° C.; and / or The primary grain size of the vanadium dioxide nanopowder is 20-30 nm; and / or The second solvent comprises isopropyl alcohol; and / or The second dispersant includes a silane coupling agent.

6. A method for preparing an intelligent thermal insulation coating, characterized in that: include: The composition according to any one of claims 1 to 5 is mixed evenly to obtain the intelligent thermal insulation coating.

7. The method according to claim 6, characterized in that Mixing the composition uniformly includes: adding the cesium tungsten bronze slurry dropwise into the vanadium dioxide slurry during stirring, then adding the film-forming agent, the diluent and the other additives, and then stirring and mixing uniformly.

8. The method according to claim 6, characterized in that The cesium tungsten bronze slurry is prepared according to the following steps: Adding the cesium tungsten bronze nanopowder to the first solvent and stirring for 10 to 20 minutes, then adding the first dispersant and continuing to stir for 10 to 20 minutes to obtain a mixed material; The mixture is ground for 1 to 3 hours until the particle size D 50 The cesium tungsten bronze slurry is obtained when the particle size is less than 30 nm.

9. The method according to claim 6, characterized in that The vanadium dioxide slurry is prepared according to the following steps: Adding the vanadium dioxide nanopowder to the second solvent and stirring for 10 to 20 minutes, then adding the second dispersant and continuing to stir for 10 to 20 minutes to obtain a mixed material; The mixture is ground for 1 to 3 hours until the particle size D 50 The vanadium dioxide slurry is obtained when the particle size is less than 30 nm.

10. An intelligent thermal insulation coating, characterized in that: The method is prepared by any one of claims 6 to 9.

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