Nano heat-insulating hardened coating and preparation method thereof

Abstract

The invention relates to the field of coating materials, in particular to a nanometer heat-insulation hardened coating and a preparation method thereof. The nano heat-insulating hardened coating is prepared from the following components in parts by weight: 25 to 35 parts of epoxy modified organic silicon resin, 15 to 25 parts of aliphatic polyurethane acrylate, 10 to 15 parts of polyfunctional group acrylate, 5 to 15 parts of dysprosium-doped molybdenum tungsten oxide, 1 to 3 parts of silane coupling agent, 3 to 6 parts of photoinitiator, 0.2 to 0.8 part of flatting agent and 10 to 20 parts of solvent. According to the nano heat-insulation hardened coating provided by the invention, through compounding of various resin systems and the nano heat-insulation slurry, the technical problem that hardness, heat insulation, weather resistance and transparency of an existing heat-insulation coating are difficult to consider at the same time is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating materials, in particular to a nano thermal insulation and hardening coating and a preparation method thereof. BACKGROUND

[0002] With the upgrading of technology in the fields of building energy saving, transportation and electronic device protection, the demand for coating materials with both thermal insulation and surface strengthening functions is increasingly urgent. Nano composite coating has become the core technology direction for realizing the above functions due to the size effect and functional characteristics of nano particles. The nano thermal insulation and hardening coating has been widely used in building glass, automobile windows, display panels and precision device housings, etc. due to the integrated advantages of "passive thermal insulation-surface protection".

[0003] In the prior art, the thermal insulation function of the nano thermal insulation coating is mainly realized by two types of materials: one type is metal-based nano particles (such as silver, tungsten, indium tin oxide ITO), which can absorb infrared radiation through free electron resonance, and the infrared shielding efficiency in the 800-2500 nm wave band can reach more than 70%, but this type of material has defects of high conductivity, easy oxidation failure and high cost, which limits its application in insulating scenarios; the other type is metal oxide nano particles (such as titanium dioxide, zinc oxide, silica aerogel), which realize thermal insulation through scattering and reflection of infrared light by particles, and have the characteristics of good insulation and strong weather resistance, but the thermal insulation efficiency of single oxide particles is low, and high addition amount is usually required to achieve the expected effect, which will lead to a decrease in coating transparency and poor film forming property.

[0004] To realize the integration of "thermal insulation-hardening", the prior art mostly adopts a composite scheme of directly dispersing nano thermal insulation particles in the hardening resin matrix, but this scheme generally has three major problems: first, the compatibility of thermal insulation particles and resin matrix is poor, and agglomeration easily occurs, leading to a decrease in coating light transmittance and limited improvement in thermal insulation efficiency; second, the hardness and adhesion are unbalanced, and when the coating pencil hardness reaches more than 4H, cracks easily occur during the bending or cold and hot cycle of the substrate, and the adhesion level can only reach level 2; third, the weather resistance is insufficient, and the metal-based thermal insulation particles are easily subjected to photocatalytic degradation under ultraviolet light, leading to a yellowing rate of the coating of more than 5%, and the high addition amount of oxide particles will accelerate the hydrolytic aging of the resin matrix, shortening the service life of the coating.

[0005] Therefore, it is a technical problem to be solved in the field to develop a nano thermal insulation and hardening coating with high thermal insulation, high hardness, high adhesion and weather resistance, and high transparency. SUMMARY

[0006] In view of the problems in the prior art, the purpose of the present application is to provide a nano thermal insulation and hardening coating and a preparation method thereof.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] In a first aspect, the present invention provides a nano-thermal insulating and hardening coating, comprising, by weight parts:

[0009] 25-35 parts epoxy-modified silicone resin, 15-25 parts aliphatic polyurethane acrylate, 10-15 parts multifunctional acrylate, 5-15 parts dysprosium-doped molybdenum tungsten oxide, 1-3 parts silane coupling agent, 3-6 parts photoinitiator, 0.2-0.8 parts leveling agent, and 10-20 parts solvent.

[0010] Preferably, the epoxy-modified silicone resin has an epoxy value of 0.25-0.35 mol / 100g, a solid content of 40%-60%, and a density of 1.17-1.23 g / cm³. 3 .

[0011] Preferably, the aliphatic polyurethane acrylate is a difunctional polyurethane acrylate, specifically grade RJ4257 or RJ4237.

[0012] Preferably, the multifunctional acrylate is trimethylolpropane triacrylate or pentaerythritol triacrylate.

[0013] Preferably, the silane coupling agent is a silane coupling agent containing methacryloxy group or a silane coupling agent containing amino group, specifically KH-570 or KH-550.

[0014] Preferably, the photoinitiator is photoinitiator 184 and / or photoinitiator TPO. More preferably, photoinitiator 184 and photoinitiator TPO are mixed in a weight ratio of 1:1-2.

[0015] Preferably, the leveling agent is BYK-333 or BYK-358.

[0016] Preferably, the solvent is one or more of acetone, butanone, and propylene glycol methyl ether acetate. More preferably, it is propylene glycol methyl ether acetate.

[0017] Preferably, the method for preparing the dysprosium-doped molybdenum-tungsten oxide includes:

[0018] S1. Weigh sodium tungstate and sodium molybdate and add them to deionized water. After mixing thoroughly, adjust the pH of the system to 1.0-1.5. Then add oxalic acid dropwise, stir evenly, pour into a reaction vessel, and hydrothermally treat at 110-140℃ for 10-20 hours. After the reaction is completed, filter, wash, dry and sinter to obtain molybdenum tungsten oxide precursor powder.

[0019] S2. Weigh dysprosium nitrate and add it to deionized water. After dissolving evenly, add molybdenum tungsten oxide precursor powder, ball mill, dry and sinter to obtain dysprosium-doped molybdenum tungsten oxide.

[0020] Preferably, in S1, the ratio of sodium tungstate, sodium molybdate, oxalic acid and deionized water is (1.87-1.96)g:(1.04-1.53)g:(0.32-0.46)g:(40-60)mL.

[0021] Preferably, in step S1, sintering is performed by calcining in an air atmosphere at 450-550°C for 1-2 hours.

[0022] Preferably, in S2, the ratio of molybdenum tungsten oxide precursor powder, dysprosium nitrate and deionized water is 1g:(0.26-0.45)g:(6-10)mL.

[0023] Preferably, in step S2, sintering is performed by calcining at 450-550°C in a reducing atmosphere for 1-2 hours. The reducing atmosphere refers to a hydrogen to nitrogen volume ratio of 1:9.

[0024] Secondly, the present invention provides a method for preparing a nano-thermal insulating and hardening coating, comprising the following steps:

[0025] Step 1: Mix dysprosium-doped molybdenum tungsten oxide with silane coupling agent in a weight ratio, add 1 / 4 part by weight of solvent, and disperse evenly at a speed of 800-1000 rpm to obtain nano heat insulation slurry.

[0026] Step 2: In a light-proof container, add epoxy-modified silicone resin, aliphatic polyurethane acrylate, multifunctional acrylate, photoinitiator, leveling agent, accelerator and remaining solvent in sequence, and add nano heat insulation slurry at the same time. Stir mechanically at 500-800 rpm for 20-40 minutes, and then degas under vacuum to obtain a uniform coating liquid.

[0027] Step 3: Apply the coating liquid to the pre-treated clean substrate surface by means of slot coating, spin coating or spraying, control the wet film thickness to be 15-25μm, and then place it in an oven at 60-80℃ to dry for 2-5 minutes.

[0028] Step 4: Under a nitrogen protective atmosphere, use an output wavelength of 365nm and an energy of 800-1200mJ / cm². 2 The UV curing machine is used for curing, with a curing time of 5-15 seconds, to form a nano heat-insulating and hardened coating.

[0029] The beneficial effects of this invention are as follows:

[0030] 1. The nano-thermal insulation and hardening coating provided by the present invention solves the technical problem that existing thermal insulation coatings are difficult to balance in terms of hardness, thermal insulation, weather resistance and transparency by compounding various resin systems and nano-thermal insulation slurry.

[0031] 2. The dysprosium-doped molybdenum tungsten oxide nanofiller in the nano-insulation slurry prepared by this invention has a high efficiency in near-infrared absorption and scattering, and the near-infrared shielding rate can reach more than 85%. It can effectively block solar heat radiation, reduce indoor or equipment internal temperature, and achieve significant energy-saving effect.

[0032] 3. This invention utilizes the synergistic effect of epoxy-modified silicone resin and multifunctional acrylate resins. The epoxy-modified silicone resin provides a rigid framework, the aliphatic polyurethane acrylate imparts flexibility, and the multifunctional acrylate ensures a high crosslinking density, resulting in a coating with high crosslinking density, a pencil hardness of 6H or higher, excellent wear resistance, and suitability for high-frequency contact surfaces.

[0033] 4. Molybdenum tungsten oxide has a perovskite-like structure. By doping it with rare earth metal dysprosium to modulate the band structure, it achieves broadband near-infrared absorption, which not only improves the chemical stability and weather resistance of the nano-insulating slurry, but also makes the coating less prone to yellowing or degradation in high temperature and high humidity environments, resulting in a long service life. Detailed Implementation

[0034] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0035] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0036] The present invention will be further described below with reference to the following embodiments.

[0037] Example 1

[0038] A nano-insulating and hardening coating, comprising, by weight parts:

[0039] 30 parts epoxy-modified silicone resin, 20 parts aliphatic polyurethane acrylate, 12 parts multifunctional acrylate, 10 parts dysprosium-doped molybdenum tungsten oxide, 2 parts silane coupling agent, 4 parts photoinitiator, 0.5 parts leveling agent and 15 parts solvent.

[0040] The epoxy-modified silicone resin has an epoxy value of 0.3 mol / 100g, a solid content of 50%, and a density of 1.21 g / cm³. 3 The aliphatic polyurethane acrylate is a difunctional polyurethane acrylate RJ4257; the polyfunctional acrylate is trimethylolpropane triacrylate; the silane coupling agent is KH-570; the photoinitiator is a mixture of photoinitiator 184 and photoinitiator TPO in a weight ratio of 1:1; the leveling agent is BYK-358; and the solvent is propylene glycol methyl ether acetate.

[0041] The method for preparing the dysprosium-doped molybdenum-tungsten oxide includes:

[0042] S1. Weigh 1.93g of sodium tungstate (Na2WO4) and 1.37g of sodium molybdate (Na2MoO4) and add them to 50mL of deionized water. After mixing thoroughly, add 1mol / L hydrochloric acid solution dropwise until the pH of the system is 1.0-1.5. Then add 0.39g of oxalic acid dropwise. After stirring evenly, pour the mixture into a reaction vessel and hydrothermally treat it at 120℃ for 15h. After the reaction is completed, filter the reaction solution and collect the solid. Wash it three times with deionized water and methanol in sequence, dry it under vacuum, and then place it in a muffle furnace and calcine it at 500℃ in an air atmosphere for 1.5h. After cooling, the molybdenum tungsten oxide precursor powder is obtained.

[0043] S2. Weigh 0.36g of dysprosium nitrate (Dy(NO3)3·6H2O) and add it to 8mL of deionized water. After dissolving evenly, add 1g of molybdenum tungsten oxide precursor powder and ball mill at 350rpm for 3h. After ball milling, vacuum dry the powder and then place it in a muffle furnace. Calcinate it at 500℃ in a reducing atmosphere (hydrogen and nitrogen volume ratio 1:9) for 1.5h. After cooling, pulverize it to a particle size of 20-50nm to obtain dysprosium-doped molybdenum tungsten oxide.

[0044] The preparation method of the above-mentioned nano-thermal insulating and hardening coating includes the following steps:

[0045] Step 1: Mix dysprosium-doped molybdenum tungsten oxide with silane coupling agent in a weight ratio, add 1 / 4 part by weight of solvent, and disperse evenly at 1000 rpm to obtain nano-insulating slurry;

[0046] Step 2: In a light-proof container, add epoxy-modified silicone resin, aliphatic polyurethane acrylate, multifunctional acrylate, photoinitiator, leveling agent, accelerator and remaining solvent in sequence, and add nano heat insulation slurry at the same time. Stir mechanically at 600 rpm for 30 minutes, and then degas under vacuum to obtain a uniform coating liquid.

[0047] Step 3: Apply the coating liquid to the pre-treated clean substrate surface through slit coating, control the wet film thickness to 20 μm, and then place it in an oven at 70°C to dry for 3 min.

[0048] Step 4: Under a nitrogen protective atmosphere, use an output wavelength of 365nm and an energy of 1000mJ / cm². 2 The UV curing machine is used for curing, with a curing time of 10 seconds, to form a nano heat-insulating and hardened coating.

[0049] Example 2

[0050] A nano-insulating and hardening coating, comprising, by weight parts:

[0051] 25 parts epoxy-modified silicone resin, 15 parts aliphatic polyurethane acrylate, 10 parts multifunctional acrylate, 5 parts dysprosium-doped molybdenum tungsten oxide, 1 part silane coupling agent, 3 parts photoinitiator, 0.2 parts leveling agent and 10 parts solvent.

[0052] The epoxy-modified silicone resin has an epoxy value of 0.25 mol / 100g, a solid content of 50%, and a density of 1.18 g / cm³. 3 The aliphatic polyurethane acrylate is a difunctional polyurethane acrylate with the grade RJ4257; the polyfunctional acrylate is trimethylolpropane triacrylate; the silane coupling agent is KH-570; the photoinitiator is photoinitiator 184; the leveling agent is BYK-333; and the solvent is acetone.

[0053] The method for preparing the dysprosium-doped molybdenum-tungsten oxide includes:

[0054] S1. Weigh 1.87g sodium tungstate (Na2WO4) and 1.04g sodium molybdate (Na2MoO4) and add them to 40mL of deionized water. After mixing thoroughly, add hydrochloric acid solution dropwise until the pH of the system is 1.0-1.5. Then add 0.32g oxalic acid dropwise. After stirring evenly, pour the mixture into a reaction vessel and hydrothermally treat it at 120℃ for 10h. After the reaction is completed, filter the reaction solution and collect the solid. Wash it three times with deionized water and methanol in sequence, dry it under vacuum, and then place it in a muffle furnace and calcine it at 450℃ in an air atmosphere for 2h. After cooling, the molybdenum tungsten oxide precursor powder is obtained.

[0055] S2. Weigh 0.26g of dysprosium nitrate (Dy(NO3)3·6H2O) and add it to 6mL of deionized water. After dissolving evenly, add 1g of molybdenum tungsten oxide precursor powder and ball mill at 300rpm for 2h. After ball milling, vacuum dry the powder and then place it in a muffle furnace. Calcinate it at 450℃ in a reducing atmosphere (hydrogen and nitrogen volume ratio 1:9) for 2h. After cooling, pulverize it to a particle size of 20-50nm to obtain dysprosium-doped molybdenum tungsten oxide.

[0056] The preparation method of the above-mentioned nano-thermal insulating and hardening coating includes the following steps:

[0057] Step 1: Mix dysprosium-doped molybdenum tungsten oxide with silane coupling agent in a weight ratio, add 1 / 4 part by weight of solvent, and disperse evenly at 800 rpm to obtain nano-insulating slurry;

[0058] Step 2: In a light-proof container, add epoxy-modified silicone resin, aliphatic polyurethane acrylate, multifunctional acrylate, photoinitiator, leveling agent, accelerator and remaining solvent in sequence, and add nano heat insulation slurry at the same time. Stir mechanically at 500 rpm for 20 minutes, and then degas under vacuum to obtain a uniform coating liquid.

[0059] Step 3: Apply the coating liquid to the pre-treated clean substrate surface by spraying, control the wet film thickness to 15μm, and then place it in an oven at 60℃ to dry for 5min.

[0060] Step 4: Under a nitrogen protective atmosphere, use an output wavelength of 365nm and an energy of 800mJ / cm². 2 The UV curing machine is used for curing, with a curing time of 15 seconds, to form a nano heat-insulating and hardened coating.

[0061] Example 3

[0062] A nano-insulating and hardening coating, comprising, by weight parts:

[0063] 35 parts epoxy-modified silicone resin, 25 parts aliphatic polyurethane acrylate, 15 parts multifunctional acrylate, 15 parts dysprosium-doped molybdenum tungsten oxide, 3 parts silane coupling agent, 6 parts photoinitiator, 0.8 parts leveling agent and 20 parts solvent.

[0064] The epoxy-modified silicone resin has an epoxy value of 0.35 mol / 100g, a solid content of 50%, and a density of 1.22 g / cm³. 3 .

[0065] Wherein, the aliphatic polyurethane acrylate is a difunctional polyurethane acrylate RJ4237; the polyfunctional acrylate is pentaerythritol triacrylate; the silane coupling agent is KH-550; the photoinitiator is photoinitiator TPO; the leveling agent is BYK-358; and the solvent is methyl ethyl ketone (MEK).

[0066] The method for preparing the dysprosium-doped molybdenum-tungsten oxide includes:

[0067] S1. Weigh 1.96g of sodium tungstate (Na2WO4) and 1.53g of sodium molybdate (Na2MoO4) and add them to 60mL of deionized water. After mixing thoroughly, add hydrochloric acid solution dropwise until the pH of the system is 1.0-1.5. Then add 0.46g of oxalic acid dropwise. After stirring evenly, pour the mixture into a reaction vessel and hydrothermally treat it at 120℃ for 20h. After the reaction is completed, filter the reaction solution and collect the solid. Wash it three times with deionized water and methanol in sequence, dry it under vacuum, and then place it in a muffle furnace and calcine it at 550℃ in air atmosphere for 1h. After cooling, the molybdenum tungsten oxide precursor powder is obtained.

[0068] S2. Weigh 0.45g of dysprosium nitrate (Dy(NO3)3·6H2O) and add it to 10mL of deionized water. After dissolving evenly, add 1g of molybdenum tungsten oxide precursor powder and ball mill at 400rpm for 4h. After ball milling, vacuum dry the powder and then place it in a muffle furnace. Calcinate it at 550℃ in a reducing atmosphere (hydrogen and nitrogen volume ratio 1:9) for 2h. After cooling, pulverize it to a particle size of 20-50nm to obtain dysprosium-doped molybdenum tungsten oxide.

[0069] The preparation method of the above-mentioned nano-thermal insulating and hardening coating includes the following steps:

[0070] Step 1: Mix dysprosium-doped molybdenum tungsten oxide with silane coupling agent in a weight ratio, add 1 / 4 part by weight of solvent, and disperse evenly at 1000 rpm to obtain nano-insulating slurry;

[0071] Step 2: In a light-proof container, add epoxy-modified silicone resin, aliphatic polyurethane acrylate, multifunctional acrylate, photoinitiator, leveling agent, accelerator and remaining solvent in sequence, and add nano heat insulation slurry at the same time. Stir mechanically at 500-800 rpm for 40 minutes, and then degas under vacuum to obtain a uniform coating liquid.

[0072] Step 3: Apply the coating liquid to the pre-treated clean substrate surface by spin coating, control the wet film thickness to 25μm, and then place it in an oven at 80℃ to dry for 2min.

[0073] Step 4: Under a nitrogen protective atmosphere, use an output wavelength of 365nm and an energy of 1200mJ / cm².2 The UV curing machine is used for curing, with a curing time of 5 seconds, to form a nano heat-insulating and hardened coating.

[0074] Comparative Example 1

[0075] A nano-insulating and hardening coating differs from Example 1 in that it does not contain multifunctional acrylates, while the other components and preparation methods are the same as in Example 1.

[0076] The nano-insulating and hardening coating, by weight, includes:

[0077] 36 parts epoxy-modified silicone resin, 26 parts aliphatic polyurethane acrylate, 10 parts dysprosium-doped molybdenum tungsten oxide, 2 parts silane coupling agent, 4 parts photoinitiator, 0.5 parts leveling agent and 15 parts solvent.

[0078] Comparative Example 2

[0079] A nano-insulating and hardening coating differs from Example 1 in that the dysprosium-doped molybdenum tungsten oxide is replaced with conventional nano-cesium tungsten bronze powder (Cs). 0.33 WO3).

[0080] Comparative Example 3

[0081] A nano-thermal insulating and hardening coating differs from Example 1 in that the dysprosium-doped molybdenum tungsten oxide is replaced with molybdenum tungsten oxide precursor powder (preparation is the same as step S1 of Example 1).

[0082] To more clearly illustrate the content of this invention, the coatings prepared in Example 1 and Comparative Examples 1-3 were compared in terms of performance, and the results are shown in Table 1:

[0083] Table 1. Performance Comparison of Different Nanoscale Thermal Insulation Hardening Coatings

[0084]

[0085] As can be seen from Table 1, the nano-thermal insulating and hardening coating prepared in Example 1 of this invention is a high-performance coating that achieves an optimal balance between thermal insulation, hardness, transparency, adhesion, and long-term weather resistance. The significant decrease in hardness and adhesion in Comparative Example 1 demonstrates the crucial role of multifunctional acrylates in constructing a high-crosslink density network; their absence directly leads to a significant decrease in coating hardness and adhesion. Comparative Example 2 shows that although traditional nano-cesium tungsten bronze may have a slight advantage in initial thermal insulation performance, its severe weather resistance defects and poor optical properties prevent it from replacing the dysprosium-doped molybdenum tungsten oxide of this invention in high-end, long-term applications. Comparative Example 3 highlights the importance of dysprosium doping in the dysprosium-doped molybdenum tungsten oxide; it is not a simple mixture but rather alters the band structure and intrinsic properties of the filler at the crystal structure level, thereby significantly improving thermal insulation efficiency and enhancing material stability.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A nano-thermal insulating and hardening coating, characterized in that, Calculated by weight, including: 25-35 parts epoxy-modified silicone resin, 15-25 parts aliphatic polyurethane acrylate, 10-15 parts multifunctional acrylate, 5-15 parts dysprosium-doped molybdenum tungsten oxide, 1-3 parts silane coupling agent, 3-6 parts photoinitiator, 0.2-0.8 parts leveling agent, and 10-20 parts solvent.

2. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, The epoxy-modified silicone resin has an epoxy value of 0.25-0.35 mol / 100g, a solid content of 40%-60%, and a density of 1.17-1.23 g / cm³. 3 .

3. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, The aliphatic polyurethane acrylate is a difunctional polyurethane acrylate, specifically designated as RJ4257 or RJ4237.

4. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, The multifunctional acrylate is trimethylolpropane triacrylate or pentaerythritol triacrylate.

5. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, The silane coupling agent is a silane coupling agent containing methacryloxy group or a silane coupling agent containing amino group; the photoinitiator is photoinitiator 184 and / or photoinitiator TPO; the leveling agent is BYK-333 or BYK-358.

6. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, The solvent is one or more of acetone, butanone, and propylene glycol methyl ether acetate. More preferably, it is propylene glycol methyl ether acetate.

7. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, The method for preparing the dysprosium-doped molybdenum tungsten oxide includes the following steps. S1. Weigh sodium tungstate and sodium molybdate and add them to deionized water. After mixing thoroughly, adjust the pH of the system to 1.0-1.

5. Then add oxalic acid dropwise, stir evenly, and pour into a reaction vessel. Perform hydrothermal treatment at 110-140℃ for 10-20 hours. After the reaction is completed, filter, wash, and dry the product in sequence, and sinter in an air atmosphere to obtain molybdenum tungsten oxide precursor powder. S2. Weigh dysprosium nitrate and add it to deionized water. After dissolving evenly, add molybdenum tungsten oxide precursor powder, ball mill it, dry it, and sinter it under a reducing atmosphere to obtain dysprosium-doped molybdenum tungsten oxide.

8. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, In S1, the ratio of sodium tungstate, sodium molybdate, oxalic acid, and deionized water is (1.87-1.96)g:(1.04-1.53)g:(0.32-0.46)g:(40-60)mL.

9. The nano-thermal insulating and hardening coating according to claim 1, characterized in that, In S2, the ratio of molybdenum tungsten oxide precursor powder, dysprosium nitrate and deionized water is 1g:(0.26-0.45)g:(6-10)mL.

10. A method for preparing the nano-thermal insulating and hardening coating according to claim 1, comprising the following steps: Step 1: Mix dysprosium-doped molybdenum tungsten oxide with silane coupling agent in a weight ratio, add some solvent, and disperse evenly to obtain nano-insulating slurry; Step 2: In a light-proof container, add epoxy-modified silicone resin, aliphatic polyurethane acrylate, multifunctional acrylate, photoinitiator, leveling agent, accelerator and remaining solvent in sequence, and add nano heat insulation slurry at the same time. Stir evenly and degas to obtain a uniform coating liquid. Step 3: Apply the coating liquid to the pre-treated clean substrate surface and then place it in an oven to dry; Step 4: Use a UV curing machine to cure the coating and form a nano-heat-insulating and hardened coating.

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