A coating layer having excellent heat insulation performance and transparent appearance and a method for preparing the same

Abstract

This invention discloses a transparent coating with excellent thermal insulation performance and its preparation method, belonging to the field of transparent thermal insulation materials technology. The transparent coating with excellent thermal insulation performance is composed of the following components: silica, additives, transparent resin, and solvent. The specific steps are: (1) coating the outside of a polymer template with organosilicon and sintering at high temperature to obtain hollow silica; (2) modifying the hollow silica to improve its compatibility with the resin; (3) compositing silica particles with the resin. This coating has good thermal insulation performance and a transparent appearance, and can be used on the surfaces of various glass materials, such as automotive glass and glass curtain walls.

Description

Technical Field

[0001] This invention belongs to the field of heat-insulating coatings, specifically relating to a transparent coating with excellent heat-insulating performance and its preparation method. Background Technology

[0002] In modern buildings, glass curtain walls and windows now account for over 45% of the exterior facade area, becoming the most active and vulnerable link in the building envelope for heat exchange. Ordinary glass lacks selectivity for the solar spectrum, allowing visible light to penetrate while also allowing a large amount of infrared radiation to directly enter, causing indoor temperatures to rise. This significantly exacerbates total building energy consumption, especially in regions with high summer temperatures, where over 60% of the air conditioning load originates from solar radiation heat entering through the glass.

[0003] Transparent thermal insulation materials, through spectral selective modulation technology, block most infrared and ultraviolet rays while maintaining a certain level of visible light transmittance. This characteristic makes them a core means of balancing lighting needs and thermal management. Glass coated with thermal insulation films can significantly reduce indoor temperatures, further achieving energy conservation and emission reduction. In addition, transparent thermal insulation technology also offers comprehensive benefits such as ultraviolet shielding (protecting people and furniture), reducing glare, and maintaining visual transparency, making it one of the key technologies for achieving the "dual carbon" goals of green buildings.

[0004] Traditional thermal insulation materials face a core contradiction: the incompatibility between "transparency" and "thermal insulation." For example, while heat-reflective coated glass can reflect infrared rays, its visible light transmittance is usually less than 50%, and its high reflectivity causes light pollution. Thermal insulation films can block some heat, but they result in significant light loss, short lifespan, and high cost.

[0005] To address the aforementioned issues, this invention employs a strategy of combining hollow silica with transparent resin to prepare a coating that is both transparent and possesses excellent thermal insulation properties. Compared to conventional insulation materials, the hollow silica composite resin technology offers an innovative solution for transparent thermal insulation through precise interface design and dimensional control. The surface-modified hollow silica microspheres, when combined with transparent resin, can efficiently absorb ultraviolet light, reduce interface reflection, improve coating hardness, and resist water and oxygen corrosion; and block most infrared rays, thus lowering indoor temperature. Through integrated material-structure-function design, this invention successfully resolves the traditional contradiction between transparency and thermal insulation. With the popularization of green building standards and the advancement of the "dual-carbon" policy, this technology is expected to become the mainstream solution for transparent thermal insulation materials, propelling the energy-saving glass industry from a new stage of "high-energy-consumption passive heat reduction" to "intelligent dynamic temperature regulation." Summary of the Invention

[0006] To address the challenge of balancing transparency and thermal insulation in existing technologies, this invention proposes a transparent coating with excellent thermal insulation performance, along with its preparation method. This transparent thermal insulation coating, by forming an ultra-thin functional layer on the glass surface, effectively blocks infrared heat and ultraviolet rays while maintaining high light transmittance. This significantly reduces indoor temperature and is an indispensable core technology for achieving building energy conservation and environmental protection.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides a transparent coating with excellent heat insulation performance and a method for preparing the same, characterized in that the heat insulation coating comprises silica, additives, transparent resin, and solvent; The silica mentioned is obtained by coating the outside of a polymer template with organosilicon, sintering it at high temperature to form a hollow structure, and then modifying it with a silane coupling agent. The additives include ultraviolet absorbers, defoamers, and dispersants.

[0008] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that, by mass fraction, the coating comprises 1-3 parts of ultraviolet absorber, 0.1-0.5 parts of defoamer, 0.5-1 parts of dispersant, 20-50 parts of transparent resin, 5-10 parts of hollow modified silica, and 40-90 parts of solvent.

[0009] The coating described above, which is transparent in appearance and has excellent heat insulation properties, and its preparation method, are characterized by comprising the following steps: S1: Silicone is coated on the outside of a polymer template and sintered at high temperature to obtain hollow silicon dioxide. S2: Modify hollow silica with silane coupling agent to improve compatibility with resin in the subsequent process; S3: Add modified silica particles and resin to the solvent and mix them evenly. Add UV absorbers, defoamers, dispersants and other additives to the system, spray evenly on the surface of the glass substrate, and cure into a film.

[0010] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the ultraviolet absorber includes at least one of 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol.

[0011] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the defoamer includes at least one of polydimethylsiloxane (Mn=100-2000), polyethylene glycol (Mn=200-4000), polypropylene glycol (Mn=200-4000), petroleum hydrocarbons, and white oil.

[0012] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the dispersant includes at least one of sodium polynaphthalene sulfonate, sodium methylene bis(naphthalene) sulfonate, sodium polyacrylate, sodium lignosulfonate, alkylphenol polyoxyethylene ether phosphate, and sodium fatty acid methyl ester sulfonate.

[0013] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the polymer template includes at least one of polyacrylic acid (Mn=1000-50000), polyvinylpyrrolidone (Mn=2000-40000), and polyoxyethylene-polyoxypropylene-polyoxyethylene.

[0014] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the organosilicon includes at least one of isobutyl cage polysilsesquioxane, vinyl cage polysilsesquioxane, amino cage polysilsesquioxane, aminopropyl cage polysilsesquioxane, allyl cage polysilsesquioxane, and phenyl cage polysilsesquioxane.

[0015] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the silane coupling agent includes at least one of γ-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

[0016] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the transparent resin includes at least one of acrylonitrile-butadiene-styrene copolymer, polystyrene, polymethyl methacrylate, polycarbonate, polyethylene, polyamide, polyvinyl chloride, and polyethylene terephthalate.

[0017] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that the solvent includes at least one of ethanol, propylene glycol, glycerol, acetone, butanone, ethyl acetate, methyl acetate, ethylene glycol monobutyl ether, diethylene glycol butyl ether, dichloromethane, acetonitrile, and N-methylpyrrolidone.

[0018] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that, in S1, the hollow structure high-temperature sintering step is as follows: organosilicon is dissolved in chloroform and mixed evenly with a polymer template, and dried in a vacuum oven at 85°C for 8-12 h; the heating program of the tube furnace is set as follows: at a rate of 5-10°C / min, the temperature is raised to 600-800°C, held for 1-6 h, and then cooled by ventilation and static cooling until room temperature is obtained to obtain hollow structure silicon dioxide particles.

[0019] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that, in step S2, the silane coupling agent modification step is as follows: 1-10 parts of hollow silica are dissolved in 50-200 parts of ethanol, the pH is adjusted to 8-10 with 0.5-3 parts of ammonia, 0.1-0.8 parts of silane coupling agent are added, the mixture is stirred for 2-8 hours, and after drying, the modified hollow silica particles are obtained.

[0020] The coating with a transparent appearance and excellent heat insulation performance and its preparation method are characterized in that, in step S3, the coating curing temperature is 40-80℃ and the coating thickness is 100-300 μm.

[0021] By employing the above technical solution, hollow silica is utilized for efficient absorption of infrared and ultraviolet light. Simultaneously, the modified hollow silica spheres exhibit good compatibility with transparent resin, optimizing the dispersion performance of the silica spheres in the coating. This coating can be widely applied to various glass substrates, especially in glass curtain walls and automotive glass applications. Furthermore, the preparation method is simple and convenient to use, offering significant advantages compared to existing technologies.

[0022] In summary, this application has the following beneficial effects: Compared to the dense and smooth solid silica structure, hollow silica, with its abundant micropores and cavities, can form a more significant optical trapping effect (i.e., light undergoes multiple reflections and scatterings within the cavities). This unique structure greatly extends the optical path and significantly improves the material's efficiency in capturing and absorbing photons in the mid- and far-infrared or specific ultraviolet spectral regions, thus exhibiting superior optical absorption performance.

[0023] By chemically modifying the surface of hollow silica spheres using silane coupling agents, specific organic functional groups can be introduced onto their surface. These functional groups exhibit better affinity for the molecular chains of transparent resins or can undergo chemical reactions, thereby significantly improving the interfacial compatibility between the two. This improved compatibility effectively reduces the tendency of silica nanoparticles to aggregate in the resin matrix, promoting a more uniform and stable dispersion. Ultimately, this highly uniform dispersion system ensures the consistency of the internal heat conduction path of the composite coating, resulting in a more balanced and efficient overall thermal insulation performance.

[0024] Among numerous thermal insulation solutions (such as high-reflectivity coatings, foam insulation layers, or hollow brick structures), there is a common problem of limited application scenarios, especially in situations requiring high light transmittance. In contrast, using transparent coatings for thermal insulation offers an innovative approach. This solution forms a micron-sized functional film on the substrate surface, effectively blocking infrared heat energy from the solar spectrum while maintaining excellent visible light transmittance. This transparent thermal insulation technology provided by the present invention successfully solves the core contradiction of traditional thermal insulation materials being unable to simultaneously achieve light transmittance and thermal insulation, greatly expanding the application potential of thermal insulation technology in optically sensitive fields. Attached Figure Description

[0025] Figure 1 A schematic diagram of a coating structure that is transparent in appearance and has excellent heat insulation performance, provided by the present invention; Figure 2 This is a schematic diagram of a coating preparation method that provides a transparent appearance and excellent heat insulation performance according to the present invention.

[0026] Figure 3 A comparison diagram of the transmittance in the visible light range between Example 1 and Comparative Example 1, which provides a transparent coating with excellent heat insulation performance according to the present invention.

[0027] Reference numerals: 1. Hollow silica particles; 2. Ultraviolet absorber; 3. Transparent resin; 4. Glass substrate. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] Example 1 Add 300 ml of chloroform to a 500 ml beaker and dissolve 4.2 g of isobutyl cage-like polysilsesquioxane in the system. Slowly add 2 g of polyvinylpyrrolidone (Mn=30000) and stir with a magnetic stirrer at 400 rpm for 10 min to ensure uniform dispersion of the polyvinylpyrrolidone. Dry in a vacuum oven at 85℃ for 8 h to remove excess solvent, yielding isobutyl cage-like polysilsesquioxane-coated polyvinylpyrrolidone particles. Place the powder in a tube furnace and sinter in air atmosphere. Set the program to slowly heat to 600℃ at a heating rate of 5℃ / min, hold for 2 h, and then cool to room temperature to obtain hollow silica particles.

[0030] In a 500 ml beaker, add 200 g of ethanol and 5 g of hollow silica, adjust the pH to 8 with 3 g of ammonia, add 0.5 g of γ-aminopropyltriethoxysilane, stir for 4 h, and then remove excess solvent by rotary evaporation to obtain modified hollow silica particles.

[0031] 1 g of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, 0.2 g of polydimethylsiloxane (Mn=1000), 0.5 g of alkylphenol polyoxyethylene ether phosphate, and 30 g of acrylonitrile-butadiene-styrene copolymer were dissolved in 80 g of ethanol. A magnetic stirrer was set to 600 rpm, and 5 g of modified hollow silica particles were slowly added and stirred for 20 min. The coating was then uniformly sprayed onto a glass surface and cured at 50℃ for 1 h, resulting in a final coating thickness of 150 μm. The properties of this transparent heat-insulating coating and the prepared coating are shown in Table 1.

[0032] Table 1 Example 2 Add 300 ml of chloroform to a 500 ml beaker and dissolve 4.2 g of vinyl cage-type polysilsesquioxane in the system. Slowly add 2 g of polyacrylic acid (Mn=45000) and stir with a magnetic stirrer at 500 rpm for 10 min to ensure uniform dispersion of the polyacrylic acid. Dry in a vacuum oven at 85℃ for 8 h to remove excess solvent, yielding vinyl cage-type polysilsesquioxane-coated polyacrylic acid particles. Place the powder in a tube furnace and sinter in air atmosphere. Set the program to slowly heat to 800℃ at a heating rate of 5℃ / min, hold for 2 h, and then cool to room temperature to obtain hollow silica particles.

[0033] In a 500 ml beaker, add 200 g of ethanol and 6.5 g of hollow silica, adjust the pH to 8 with 3 g of ammonia, add 0.8 g of γ-aminopropyltriethoxysilane, stir for 3 h, and then remove excess solvent by rotary evaporation to obtain modified hollow silica particles.

[0034] 1 g of 2,4-dihydroxybenzophenone, 0.2 g of polypropylene glycol (Mn=800), 0.5 g of alkylphenol polyoxyethylene ether phosphate, and 30 g of polystyrene were dissolved in 85 g of ethanol. A magnetic stirrer was set to 600 rpm, and 6 g of modified hollow silica particles were slowly added and stirred for 20 min. The coating was then uniformly sprayed onto a glass surface and cured at 60℃ for 0.5 h, resulting in a final coating thickness of 200 μm. The properties of this transparent heat-insulating coating and the prepared coating are shown in Table 2.

[0035] Table 2 Example 3 Add 300 ml of chloroform to a 500 ml beaker and dissolve 4.2 g of phenyl cage-type polysilsesquioxane in the system. Slowly add 2 g of polyoxyethylene-polyoxypropylene-polyoxyethylene, and stir with a magnetic stirrer at 500 rpm for 10 min to uniformly disperse the polyoxyethylene-polyoxypropylene-polyoxyethylene. Dry in a vacuum oven at 85℃ for 12 h to remove excess solvent, obtaining phenyl cage-type polysilsesquioxane-coated polyoxyethylene-polyoxypropylene-polyoxyethylene particles. Place the powder in a tube furnace and sinter in air atmosphere. Set the program to slowly heat to 700℃ at a heating rate of 5℃ / min, hold for 3 h, and then cool to room temperature to obtain hollow silica particles.

[0036] In a 500 ml beaker, add 180 g of ethanol and 6.5 g of hollow silica, adjust the pH to 9 with 3 g of ammonia, add 0.7 g of γ-methacryloyloxypropyltrimethoxysilane, stir for 3 h, and then remove excess solvent by rotary evaporation to obtain modified hollow silica particles.

[0037] 1 g of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.2 g of polyethylene glycol (Mn=1000), 0.5 g of sodium methylene bis(thalassyl)sulfonate, and 30 g of polymethyl methacrylate were dissolved in 85 g of ethylene glycol monobutyl ether. A magnetic stirrer was set to 600 rpm, and 6 g of modified hollow silica particles were slowly added and stirred for 20 min. The coating was then uniformly sprayed onto a glass surface and cured at 60℃ for 0.5 h, resulting in a final coating thickness of 200 μm. The properties of this transparent heat-insulating coating and the prepared coating are shown in Table 3.

[0038] Table 3 Comparative Example 1 Add 300 ml of chloroform to a 500 ml beaker and dissolve 4.2 g of isobutyl cage-like polysilsesquioxane in the system. Slowly add 2 g of polyvinylpyrrolidone (Mn=30000) and stir with a magnetic stirrer at 400 rpm for 10 min to ensure uniform dispersion of the polyvinylpyrrolidone. Dry in a vacuum oven at 85℃ for 8 h to remove excess solvent, yielding isobutyl cage-like polysilsesquioxane-coated polyvinylpyrrolidone particles. Place the powder in a tube furnace and sinter in air atmosphere. Set the program to slowly heat to 300℃ at a heating rate of 5℃ / min, hold for 2 h, and then cool to room temperature to obtain hollow silica particles.

[0039] In a 500 ml beaker, add 200 g of ethanol and 5 g of hollow silica, adjust the pH to 8 with 3 g of ammonia, add 0.5 g of γ-aminopropyltriethoxysilane, stir for 4 h, and then remove excess solvent by rotary evaporation to obtain modified hollow silica particles.

[0040] 1 g of 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, 0.2 g of polydimethylsiloxane (Mn=1000), 0.5 g of alkylphenol polyoxyethylene ether phosphate, and 30 g of acrylonitrile-butadiene-styrene copolymer were dissolved in 80 g of ethanol. A magnetic stirrer was set to 600 rpm, and 5 g of modified hollow silica particles were slowly added and stirred for 20 min. The coating was then uniformly sprayed onto a glass surface and cured at 50℃ for 1 h, resulting in a final coating thickness of 150 μm. The properties of this transparent heat-insulating coating and the prepared coating are shown in Table 4.

[0041] Table 4 Comparative Example 2 Add 300 ml of chloroform to a 500 ml beaker and dissolve 4.2 g of vinyl cage-type polysilsesquioxane in the system. Slowly add 2 g of polyacrylic acid (Mn=45000) and stir with a magnetic stirrer at 500 rpm for 10 min to ensure uniform dispersion of the polyacrylic acid. Dry in a vacuum oven at 85℃ for 8 h to remove excess solvent, yielding vinyl cage-type polysilsesquioxane-coated polyacrylic acid particles. Place the powder in a tube furnace and sinter in air atmosphere. Set the program to slowly heat to 800℃ at a heating rate of 5℃ / min, hold for 2 h, and then cool to room temperature to obtain hollow silica particles.

[0042] In a 500 ml beaker, add 200 g of ethanol and 6.5 g of hollow silica, then add 0.8 g of γ-aminopropyltriethoxysilane. After stirring for 3 h, remove excess solvent by rotary evaporation to obtain modified hollow silica particles.

[0043] 1 g of 2,4-dihydroxybenzophenone, 0.2 g of polypropylene glycol (Mn=800), 0.5 g of alkylphenol polyoxyethylene ether phosphate, and 30 g of polystyrene were dissolved in 85 g of ethanol. A magnetic stirrer was set to 600 rpm, and 6 g of modified hollow silica particles were slowly added and stirred for 20 min. The coating was then uniformly sprayed onto a glass surface and cured at 60℃ for 0.5 h, resulting in a final coating thickness of 200 μm. The properties of this transparent heat-insulating coating and the prepared coating are shown in Table 5.

[0044] Table 5 Comparative Example 3 Add 300 ml of chloroform to a 500 ml beaker and dissolve 4.2 g of phenyl cage-type polysilsesquioxane in the system. Slowly add 2 g of polyoxyethylene-polyoxypropylene-polyoxyethylene, and stir with a magnetic stirrer at 500 rpm for 10 min to uniformly disperse the polyoxyethylene-polyoxypropylene-polyoxyethylene. Dry in a vacuum oven at 85℃ for 12 h to remove excess solvent, obtaining phenyl cage-type polysilsesquioxane-coated polyoxyethylene-polyoxypropylene-polyoxyethylene particles. Place the powder in a tube furnace and sinter in air atmosphere. Set the program to slowly heat to 700℃ at a heating rate of 5℃ / min, hold for 3 h, and then cool to room temperature to obtain hollow silica particles.

[0045] In a 500 ml beaker, add 180 g of ethanol and 6.5 g of hollow silica, adjust the pH to 9 with 3 g of ammonia, add 0.7 g of γ-methacryloyloxypropyltrimethoxysilane, stir for 3 h, and then remove excess solvent by rotary evaporation to obtain modified hollow silica particles.

[0046] 1 g of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.2 g of polyethylene glycol (Mn=1000), 0.5 g of sodium methylene bis(thalassyl)sulfonate, and 30 g of polymethyl methacrylate were dissolved in 85 g of ethylene glycol monobutyl ether. A magnetic stirrer was set to 600 rpm, and 6 g of modified hollow silica particles were slowly added and stirred for 20 min. The coating was then uniformly sprayed onto a glass surface and cured at 60℃ for 0.5 h, resulting in a final coating thickness of 10 μm. The properties of this transparent heat-insulating coating and the prepared coating are shown in Table 6.

[0047] Table 6 The performance of the transparent heat-insulating coatings prepared in Examples 1-3 and Comparative Examples 1-3 was tested, and the specific process is as follows: The haze of the transparent heat-insulating coating was tested according to GB / T 2410-2008; The hardness of the transparent heat-insulating coating was tested according to GB / T 6739-1996; The thermal insulation performance of transparent thermal insulation coatings is tested according to GB / T 29501-2013.

[0048] As can be seen from the data in Tables 1-3, the transparent heat-insulating coatings prepared in Examples 1-3 of the present invention have good appearance and hardness, and can also play a good heat-insulating role.

[0049] The test results from Example 1 and Comparative Example 1 show that sintering temperature has a significant impact on the final structure of silica. At lower sintering temperatures, the inner polymer template is difficult to carbonize and is released as CO2 or CO. The resulting particles are not hollow structures, but rather core-shell structures with a polymer template as the inner layer and organosilicon as the outer layer. Such structures are less likely to form "light traps," thus hindering the absorption of ultraviolet and infrared wavelengths. Therefore, sintering temperature is crucial for the formation of the silica structure.

[0050] The test results from Example 2 and Comparative Example 2 show that adjusting the pH value during silica modification can facilitate the modification process of functional groups. By modifying the silica surface, the compatibility between the particles and the transparent resin can be further improved, resulting in uniform particle distribution and good heat insulation effect.

[0051] The test results from Example 3 and Comparative Example 3 show that the final coating thickness has a significant impact on the heat insulation effect. If the coating is too thin, the heat migration path in the vertical direction is too short, reducing the heat insulation effect. Therefore, the coating thickness needs to be strictly controlled.

[0052] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A coating with a transparent appearance and excellent thermal insulation performance, and a method for preparing the same, characterized in that... The heat-insulating coating comprises silica, additives, transparent resin, and solvent; The silica mentioned is obtained by coating the outside of a polymer template with organosilicon, sintering it at high temperature to form a hollow structure, and then modifying it with a silane coupling agent. The additives include ultraviolet absorbers, defoamers, and dispersants.

2. The coating with a transparent appearance and excellent heat insulation performance and its preparation method according to claim 1, characterized in that, By mass fraction, the coating comprises 1-3 parts of ultraviolet absorber, 0.1-0.5 parts of defoamer, 0.5-1 parts of dispersant, 20-50 parts of transparent resin, 5-10 parts of hollow modified silica, and 40-90 parts of solvent.

3. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claims 1-2, is characterized in that... Includes the following steps: S1: The organosilicon is coated on the outside of the polymer template and sintered at high temperature to obtain hollow silicon dioxide. S2: Modify hollow silica with silane coupling agent to improve compatibility with resin in the subsequent process; S3: Add modified silica particles and resin to the solvent and mix them evenly. Add UV absorbers, defoamers, dispersants and other additives to the system, spray evenly on the surface of the glass substrate, and cure into a film.

4. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claims 1-2, is characterized in that... The ultraviolet absorber includes at least one of 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, and 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol.

5. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claims 1-2, is characterized in that... The defoamer includes at least one of polydimethylsiloxane (Mn=100-2000), polyethylene glycol (Mn=200-4000), polypropylene glycol (Mn=200-4000), petroleum hydrocarbons, and white oil.

6. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claims 1-2, is characterized in that... The dispersant includes at least one of sodium polynaphthalene sulfonate, sodium methylene bis(thalassium) sulfonate, sodium polyacrylate, sodium lignin sulfonate, alkylphenol polyoxyethylene ether phosphate, and sodium fatty acid methyl ester sulfonate.

7. The coating with a transparent appearance and excellent heat insulation performance and its preparation method according to claim 1, characterized in that, The polymer template includes at least one of polyacrylic acid (Mn=1000-50000), polyvinylpyrrolidone (Mn=2000-40000), and polyoxyethylene-polyoxypropylene-polyoxyethylene.

8. The coating with a transparent appearance and excellent heat insulation performance and its preparation method according to claim 1, characterized in that, The organosilicon includes at least one of isobutyl cage polysilsesquioxane, vinyl cage polysilsesquioxane, amino cage polysilsesquioxane, aminopropyl cage polysilsesquioxane, allyl cage polysilsesquioxane, and phenyl cage polysilsesquioxane.

9. The coating with a transparent appearance and excellent heat insulation performance and its preparation method according to claim 1, characterized in that, The silane coupling agent includes at least one of γ-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

10. A coating with a transparent appearance and excellent heat insulation performance, and its preparation method, according to claims 1-2, characterized in that, The transparent resin includes at least one of acrylonitrile-butadiene-styrene copolymer, polystyrene, polymethyl methacrylate, polycarbonate, polyethylene, polyamide, polyvinyl chloride, and polyethylene terephthalate.

11. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, according to claims 1-2, is characterized in that, The solvent includes at least one of ethanol, propylene glycol, glycerol, acetone, butanone, ethyl acetate, methyl acetate, ethylene glycol monobutyl ether, diethylene glycol butyl ether, dichloromethane, acetonitrile, and N-methylpyrrolidone.

12. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claim 3, is characterized in that... In S1, the hollow structure high-temperature sintering step is as follows: organosilicon is dissolved in chloroform and mixed evenly with a polymer template, and dried in a vacuum oven at 85°C for 8-12 h; the heating program of the tube furnace is set as follows: at a rate of 5-10°C / min, the temperature is raised to 600-800°C, held for 1-6 h, and then cooled by ventilation and static cooling until room temperature is obtained to obtain hollow structure silicon dioxide particles.

13. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claim 3, is characterized in that... In S2, the silane coupling agent modification step is as follows: dissolve 1-10 parts of hollow silica in 50-200 parts of ethanol, adjust the pH to 8-10 with 0.5-3 parts of ammonia, add 0.1-0.8 parts of silane coupling agent, stir for 2-8 hours, and dry to obtain the modified hollow silica particles.

14. The coating with a transparent appearance and excellent heat insulation performance, and its preparation method, as described in claim 3, is characterized in that... In S3, the coating curing temperature is 40-80℃ and the coating thickness is 100-300 μm.

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