Solar full-spectrum high-reflection heat-insulation coating and preparation method thereof

Abstract

The invention belongs to the technical field of coatings, and discloses a solar full-spectrum high-reflection heat-insulation coating and a preparation method thereof. The filler comprises the following components: 50%-70% of a film-forming emulsion, 10%-40% of a reflective filler, 0%-20% of a heat-insulating filler, 0.2%-2% of a wetting agent, 0.2%-1% of a dispersing agent, 1%-5% of a defoaming agent, 1%-5% of a coalescing agent, 0.1%-1% of a thickening agent and 10%-20% of water. Reflection fillers with different particle sizes are added into the coating, the adding proportion is optimized, the reflection performance of the coating in ultraviolet, visible light and near-infrared bands is optimized, and the effect of improving the solar full-spectrum high reflection performance is achieved; therefore, heat absorbed by various surfaces such as building outer walls, roofs, vehicle surfaces and storage tank equipment is reduced, the internal temperature is reduced, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a solar full-spectrum high-reflective heat-insulating coating and a preparation method thereof. Background Art

[0002] To this end, countries are vigorously promoting the optimization of energy structure and improving energy efficiency to achieve the established timetable. However, high energy consumption in industries, transportation, and construction still poses a challenge to achieving these goals. Therefore, reducing energy consumption in these key areas has become a core requirement for achieving emission reduction targets. In order to effectively reduce energy consumption, common methods currently include improving energy efficiency, developing clean energy, optimizing industrial structure, and introducing advanced energy-saving technologies. For example, in the industrial field, intelligent production and green manufacturing technologies are used to optimize process flows and reduce waste of resources and energy; in the transportation field, new energy vehicles are promoted and the efficiency of transportation infrastructure is improved to reduce dependence on traditional fuels. In addition, as an important means of energy conservation, thermal insulation technology has a wide range of application value in many fields. Reducing heat transfer through thermal insulation materials can effectively reduce the load of air conditioning and heating systems, thereby reducing energy consumption.

[0003] Thermal insulation materials play an important role in building energy conservation. By improving the thermal insulation performance of building walls, windows, etc., they can reduce indoor and outdoor heat exchange and reduce the demand for heating and cooling. In industrial production, thermal insulation materials are also widely used in high-temperature equipment, pipelines and storage tanks to reduce heat loss and improve production energy efficiency. In the field of cold chain logistics and warehousing, thermal insulation technology ensures the stability of the temperature control environment and reduces the consumption of refrigeration energy. In addition, thermal insulation materials also play a role in energy saving and improving the riding experience in the thermal insulation and noise reduction of transportation tools such as electric vehicles, airplanes and high-speed railways. Therefore, thermal insulation technology has become an indispensable energy-saving measure in various industries. Among traditional thermal insulation materials, the thermal conductivity of glass wool is about 0.035W / m·K, and the thickness usually needs to reach 50-100mm to meet the building insulation requirements; the thermal conductivity of rock wool is close to 0.04W / m·K, and the commonly used thickness is between 70-150mm; the thermal conductivity of expanded polystyrene (EPS) is as low as 0.03W / m·K, and the general application thickness is about 50-100mm. In general, although these materials have low thermal conductivity, in order to achieve good thermal insulation, a thicker application layer is often required. This not only increases the amount of material used, but also takes up limited space. Therefore, with the increasing requirements for lightweight materials and space utilization, the limitations of traditional thermal insulation materials are gradually emerging. In order to overcome these shortcomings, thermal insulation coatings have gradually become a new type of thermal insulation method. Thermal insulation coatings can effectively reduce heat conduction and achieve a thinner coating thickness by mixing high-efficiency reflective fillers or low thermal conductivity thermal insulation fillers with emulsion resins, thereby showing advantages in lightweight, easy construction and long-term thermal insulation.

[0004] At present, there are many patents related to reflective heat-insulating coatings. For example, patent CN 112225493 B discloses a method for preparing a super-weather-resistant infrared reflective heat-insulating inorganic coating. By optimizing the combination of acrylic emulsion and near-infrared reflective filler, a heat-insulating coating material is prepared that can achieve a reflectivity of 85% in the near-infrared band and provide excellent weather resistance and fire resistance; CN 107337975 B discloses a method for preparing an infrared reflective heat-insulating coating based on an aluminum composite. By compounding an orange infrared reflective pigment aluminum composite and a reflective filler of titanium oxide, a coating material is prepared that can reflect 90% of near-infrared light and avoid the problem of too single color; CN 104130646 B discloses an infrared reflective heat-insulating coating for construction. In addition to conventional titanium dioxide and hollow glass microspheres, low-cost and highly resource-utilized phosphogypsum whiskers are added, which also achieves a near-infrared reflectivity of 91% and optimization of the coating production process; CN 116178991 A discloses a method for preparing a Fe2O3-Cr2O3 high near-infrared reflective filler and applying it to a silicone resin coating. The final coating has a near-infrared reflectivity of 76.68%; CN 107384072B and CN 107286776B respectively disclose infrared reflective thermal insulation coatings with cerium-doped and molybdenum-doped composites as yellow infrared reflective fillers. Both infrared reflective thermal insulation coatings achieve 90% near-infrared reflection capability while meeting the visible light color requirements.

[0005] It can be seen that the existing technology mainly studies the reflection ability of the near-infrared band. Figure 1 As shown in the figure, near infrared radiation, visible light radiation and ultraviolet radiation account for 43%, 50% and 7% of the full spectrum radiation energy respectively. It can be seen that the optimal thermal insulation effect cannot be achieved only through reflection of the near infrared band. Summary of the invention

[0006] Purpose of the invention: In order to improve the heat insulation effect of heat insulation coatings, the present invention provides a method for preparing heat insulation coatings that can achieve high reflection within the full spectrum of sunlight (200-2500nm) (ultraviolet: 200nm-380nm, visible light: 380nm-780nm, near infrared: 780nm-2500nm). The present invention optimizes the reflection performance of the coating in the ultraviolet, visible light and near infrared bands by adding reflective fillers of different particle sizes to the coating and optimizing the addition ratio, thereby achieving the effect of improving the high reflection performance of the full spectrum of sunlight, thereby reducing the heat absorbed by various surfaces including building exterior walls, roofs, vehicle surfaces, storage tank equipment, etc., reducing the internal temperature, and achieving the purpose of energy saving and emission reduction.

[0007] Technical solution: When light waves hit particles, scattering will occur, and the intensity and direction of the scattering are closely related to factors such as the size and shape of the particles and the refractive index of the medium. The scattering efficiency of light on particles will change with the change of particle size. When the particle diameter is close to the wavelength of the light wave, the scattering effect is most significant.

[0008] The present invention achieves optimal scattering and reflection effects within a specific wavelength range of sunlight (ultraviolet, visible light and near-infrared regions) by precisely controlling the particle size distribution of filler particles in the coating, thereby improving the thermal insulation performance of the coating.

[0009] The solar full-spectrum high-reflective heat-insulating coating provided by the present invention comprises the following raw material components in percentage by weight: 50% to 70% of film-forming emulsion, 10% to 40% of reflective filler, 0% to 20% of heat-insulating filler, 0.2% to 2% of wetting agent, 0.2% to 1% of dispersant, 1% to 5% of defoaming agent, 1% to 5% of film-forming aid, 0.1% to 1% of thickener and 10% to 20% of water.

[0010] Specifically, the film-forming emulsion is one of acrylic resin, polyurethane, epoxy resin, fluorocarbon resin, and silicone resin. As the basis of the coating, the film-forming emulsion forms a continuous film after drying, providing a carrier and support for other components. Materials such as acrylic resin and polyurethane have good weather resistance and adhesion, and can ensure the long-term stability and protective effect of the coating. For the present invention, acrylic resin is preferably used as the film-forming emulsion.

[0011] Specifically, the reflective filler is rutile titanium dioxide, including two or more of R-996, Altiris-800, Altiris-1000, IR-1000, and FPR-404 mixed in a specific ratio; the specific ratio is: R-996: Altiris-800: Altiris-1000: IR-1000: FPR-404 = 0% to 80%: 0% to 50%: 0% to 50%: 0% to 50%: 0% to 50%. The reflective filler has an extremely high reflectivity and can effectively reflect most of the energy in solar radiation, especially the energy in the near-infrared region, which is one of the main sources of solar thermal energy. By selecting different types of reflective fillers and mixing them in a specific ratio, the reflective performance of the coating can be optimized to achieve effective reflection of the full spectrum. For the present invention, a combination of R-996, FPR-404 and IR-1000 is preferred as the reflective filler.

[0012] Furthermore, the particle size distribution of the reflective filler is precisely controlled, and the particle size distribution range of the reflective filler is 100-1000nm. Furthermore, the reflective filler has a particle size range of 100-300nm accounting for 0%-30%; a particle size range of 300-600nm accounting for 30%-60%; and a particle size range of 600-1000nm accounting for 30%-60%.

[0013] Specifically, the heat insulating filler is one or more of hollow glass microspheres, mica, silica aerogel, ceramic microspheres, expanded perlite, and aluminum silicate fibers mixed in any proportion. These materials have a lower thermal conductivity, which can reduce the speed of heat transfer from the external environment to the inside, and further enhance the heat insulating effect of the coating. For the present invention, hollow glass microspheres are preferably used as heat insulating fillers.

[0014] Specifically, the wetting agent is one of polyether siloxane copolymer or polyether modified polydimethylsiloxane. The wetting agent is used to improve the fluidity and coating performance of the coating, ensure that the coating can be evenly distributed on the substrate, and also help to improve the adhesion between the coating and the substrate. For the present invention, the polyether siloxane copolymer is used as the wetting agent.

[0015] Specifically, the dispersant is a reflective filler dispersant and a heat-insulating filler dispersant; the reflective filler dispersant is one or more of sodium lauryl sulfate, sodium hexametaphosphate or sodium tripolyphosphate; the heat-insulating filler dispersant is one or more of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, sodium lauryl sulfate, sodium hexametaphosphate or sodium tripolyphosphate. The dispersant helps the reflective filler and the heat-insulating filler to be evenly distributed in the coating system, prevents particle aggregation, and ensures the consistency and stability of the coating performance. For the present invention, sodium lauryl sulfate is preferably used as the reflective filler dispersant, and sodium hexametaphosphate is used as the heat-insulating filler dispersant.

[0016] Specifically, the defoamer is one of tributyl phosphate, polyether modified silicone oil, and polysiloxane. In the coating production process, stirring and other operations easily introduce air to form foam, which affects the quality of the coating. The function of the defoamer is to eliminate these unnecessary foams and ensure the quality of the coating. For the present invention, tributyl phosphate is preferably used as the defoamer.

[0017] Specifically, the film-forming aid is one of ethylene glycol, propylene glycol, and dipropylene glycol butyl ether; the film-forming aid helps the film-forming process, especially under low temperature conditions, the film-forming aid can promote the leveling and curing of the film-forming emulsion, and improve the flatness and hardness of the final coating. For the present invention, dipropylene glycol butyl ether is used as a film-forming aid.

[0018] Specifically, the thickener is one of latex acrylic polymer, polyvinyl alcohol, polyacrylamide, polyethylene glycol, and polyethylene copper. The viscosity of the coating is adjusted by the thickener, making it easy to apply and not easy to flow, which helps to form a coating with uniform thickness. For the present invention, polyethylene glycol is used as the thickener.

[0019] The present invention also provides the above-mentioned solar full-spectrum reflective heat-insulating coating and a preparation method thereof, comprising the following steps:

[0020] 1) According to the above ratio, the wetting agent, reflective filler, reflective filler dispersant and water are added to part of the film-forming emulsion and mixed and stirred evenly to obtain a mixed slurry A; 2) The wetting agent, thermal insulation filler, thermal insulation filler dispersant and water are added to another part of the film-forming emulsion and mixed and stirred evenly to obtain a mixed slurry B; 3) The mixed slurries A and B are mixed and dispersed at high speed to obtain a mixed slurry C, and the film-forming aid, defoaming agent and thickener are added to the mixed slurry C according to the ratio, and stirred evenly to obtain a solar full-spectrum reflective thermal insulation coating.

[0021] The preparation method provided by the present invention prepares a mixed slurry of a reflective filler and a mixed slurry of a heat-insulating filler respectively, thereby effectively improving the dispersion effect of the two inorganic fillers in the film-forming material.

[0022] The present invention also provides an optimal solution for the above-mentioned solar full-spectrum reflective heat-insulating coating, comprising the following steps:

[0023] 1) First, 0.5 parts of polyether siloxane copolymer, 15 parts of R-996 titanium dioxide, 5 parts of FPR-404 titanium dioxide, 5 parts of IR-1000 titanium dioxide and 1 part of sodium dodecyl sulfate were sequentially added to 30 parts of acrylic emulsion, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution A.

[0024] 2) Then, 0.5 parts of polyether siloxane copolymer, 10 parts of hollow glass microspheres and 1 part of sodium hexametaphosphate were added to 30 parts of acrylic emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution B.

[0025] 3) Finally, the dispersion solutions A and B are placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniform dispersion solution C. 15 parts of dipropylene glycol butyl ether, 0.5 parts of polyethylene glycol and 0.5 parts of tributyl phosphate are sequentially added to the dispersion solution C for high-speed dispersion at room temperature for 1 hour at a speed of 1200 r / min to obtain a solar full-spectrum reflective thermal insulation coating.

[0026] Beneficial effects: Unlike existing reflective heat-insulating coating patents, this invention focuses on the reflection of the full band of the solar spectrum, not just the near-infrared band. The technical core of this invention is to precisely control the particle size distribution of the reflective filler particles so that they produce the best scattering and reflection effects on solar radiation of different wavelengths, thereby minimizing the absorption of solar energy and significantly improving the thermal insulation performance of the coating. This full-band reflection design effectively makes up for the shortcomings of the existing technology and has obvious advantages in energy saving.

[0027] The present invention adopts functional fillers with high reflectivity, which can efficiently reflect solar radiation and reduce heat accumulation. The present invention analyzes the Mie scattering theory model, determines the relationship between the particle size of the reflective filler and the solar spectrum characteristics, and establishes a preparation method for solar full-spectrum high-reflection thermal insulation coating, which realizes efficient heat reflection in the ultraviolet-visible-near infrared range.

[0028] The fully reflective heat-insulating coating of the present invention achieves efficient reflection within the full spectrum of sunlight (200nm-2500nm), significantly reducing the absorption of solar radiation heat by various surfaces including building exterior walls, roofs, vehicle surfaces, storage tank equipment, etc., thereby effectively reducing their internal temperature.

[0029] The application of this coating can significantly reduce refrigeration energy consumption in a variety of scenarios, such as buildings, vehicles, storage tanks and cold chain logistics facilities, significantly improve the efficiency of sunlight reflection, reduce internal temperature, and thus reduce air conditioning energy consumption. It effectively improves energy efficiency and brings significant energy-saving and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the solar full spectrum radiation diagram.

[0031] Figure 2 It is a diagram of the reflective heat insulation mechanism of the solar full-spectrum reflective heat insulation coating.

[0032] In the figure: 1-solar radiation energy, 2-near infrared radiation, 3-visible light radiation, 4-near infrared radiation, 5-visible light reflection, 6-ultraviolet reflection, 7-near infrared reflection, 8-ultraviolet-visible reflective coating, 9-near infrared reflective coating, 10-solar full spectrum reflective thermal insulation coating, 11-cement substrate, 12-heat transfer, 13-reflective filler A, 14-reflective filler B.

[0033] Figure 3 This is a graph showing the relationship between filler particle size and scattering efficiency in the full solar spectrum band.

[0034] Figure 4 It is the reflectivity diagram of Examples 1-4 under the full solar spectrum band.

[0035] Figure 5 is a graph of thermal conductivity of Examples 1-4. DETAILED DESCRIPTION

[0036] The technical solution of the present application is described in detail below through embodiments, but the protection scope of the present application is not limited to the embodiments.

[0037] Example 1

[0038] The reflective thermal insulation coating 1 was prepared by the following method:

[0039] 1) First, 0.5 parts of polyether-modified polydimethylsiloxane, 18 parts of Altiris-800 titanium dioxide, 18 parts of Altiris-1000 titanium dioxide, and 1 part of sodium tripolyphosphate were added to 60 parts of polyurethane emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution A.

[0040] 2) Then, 5 parts of dipropylene glycol butyl ether, 0.5 parts of polyethylene glycol and 0.5 parts of tributyl phosphate were sequentially added to the dispersion solution A and dispersed at room temperature for 1 hour at a speed of 1200 r / min to obtain a solar full-spectrum reflective heat-insulating coating 1.

[0041] Example 2

[0042] The reflective thermal insulation coating 2 was prepared by the following method:

[0043] 1) First, 0.5 parts of polyether-modified polydimethylsiloxane, 15 parts of R-996 titanium dioxide, 15 parts of Altiris-1000 titanium dioxide, and 0.5 parts of sodium hexametaphosphate were added to 30 parts of acrylic emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution A.

[0044] 2) Then, 0.5 parts of polyether-modified polydimethylsiloxane, 10 parts of hollow glass microspheres, and 1 part of sodium hexametaphosphate were sequentially added to 30 parts of acrylic emulsion, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution B.

[0045] 3) Finally, the dispersed solutions A and B are placed in a high-speed disperser and dispersed at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniform dispersed solution C. 5 parts of dipropylene glycol butyl ether, 0.5 parts of polyvinyl alcohol and 0.5 parts of tributyl phosphate are sequentially added to the dispersed solution C and dispersed at room temperature for 1 hour at a speed of 1200 r / min to obtain a solar full-spectrum reflective thermal insulation coating 2.

[0046] Example 3

[0047] The reflective thermal insulation coating 3 was prepared by the following method:

[0048] 1) First, 0.4 parts of polyether siloxane copolymer, 15 parts of Altiris-800 titanium dioxide, 5 parts of FPR-404 titanium dioxide, and 0.5 parts of sodium tripolyphosphate were added to 30 parts of epoxy resin emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution A.

[0049] 2) Then, 0.4 parts of polyether siloxane copolymer, 15 parts of mica powder and 0.8 parts of sodium tripolyphosphate were added to 30 parts of epoxy resin emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution B.

[0050] 3) Finally, the dispersed solutions A and B are placed in a high-speed disperser and dispersed at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniform dispersed solution C. 6 parts of ethylene glycol, 0.2 parts of polyvinyl alcohol and 0.5 parts of polyether modified silicone oil are added to the dispersed solution C in sequence and dispersed at room temperature for 1 hour at a speed of 1200 r / min to obtain a solar full-spectrum reflective thermal insulation coating 3.

[0051] Example 4

[0052] The reflective thermal insulation coating 4 was prepared by the following method:

[0053] 1) First, 0.5 parts of polyether siloxane copolymer, 15 parts of R-996 titanium dioxide, 5 parts of Altiris-800 titanium dioxide, 5 parts of Altiris-1000 titanium dioxide and 1 part of sodium hexametaphosphate were added to 30 parts of acrylic emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution A.

[0054] 2) Then, 0.5 parts of polyether siloxane copolymer, 10 parts of silica aerogel and 1 part of sodium hexametaphosphate were added to 30 parts of acrylic emulsion in sequence, and the mixed solution was placed in a high-speed disperser for high-speed dispersion at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniformly dispersed solution B.

[0055] 3) Finally, the dispersed solutions A and B are placed in a high-speed disperser and dispersed at room temperature for 20 minutes at a speed of 1200 r / min to obtain a uniform dispersed solution C. 5 parts of dipropylene glycol butyl ether, 0.5 parts of polyethylene glycol and 0.5 parts of polyether modified silicone oil are added to the dispersed solution C and dispersed at room temperature for 1 hour at a speed of 1200 r / min to obtain a solar full-spectrum reflective thermal insulation coating 4.

[0056] For the reflective heat-insulating coatings obtained in the above Examples 1 to 4, the coatings were applied on the surface of cement test panels at a construction temperature of 25° C. by spraying with a coating thickness of 1 mm, and then performance tests were performed.

[0057] The relationship between filler particle size and scattering efficiency under the full solar spectrum band is as follows: Figure 3 As shown;

[0058] The reflectivity of Examples 1-4 under the full solar spectrum band is as follows: Figure 4 As shown;

[0059] The thermal conductivity of Examples 1-4 is as follows Figure 5 shown.

[0060] The relationship between filler particle size and scattering efficiency in the full solar spectrum (200nm~2400nm) calculated by Mie scattering formula is as follows: Figure 3 As shown. The horizontal axis of the figure is the particle size of the reflective functional filler, the vertical axis is a certain wavelength in the solar spectrum, and the z-axis is the scattering efficiency when the particle size and wavelength are corresponding. From this figure, it can be clearly found that as the wavelength increases, the particle size needs to be increased accordingly to achieve the best scattering efficiency.

[0061] The test results are shown in Table 1. The experimental methods for solar reflectivity, thermal conductivity (25°C, W / (m·K)), adhesion, alkali resistance (48h), acid resistance (48h), water resistance (96h), and weather resistance (600h) are JG / T 235-2014, GB / T10295-2008, GB / T 6745-2008, GB / T9265-2009, GB / T 9265-2009, GB / T 1733-1993, and GB / T1865-2009, respectively.

[0062] Table 1

[0063]

[0064] As can be seen from Table 1, the reflective coating prepared in Example 1 has a high reflectivity in the near-infrared range, but not so good in the ultraviolet-visible range. This is because the selected reflective filler particle size is about 600-1000nm, which is more compatible with the near-infrared region, and no thermal insulation filler is added in this case, and the thermal conductivity is relatively low; the reflective thermal insulation coating prepared in Example 2 has a high reflectivity in the ultraviolet and visible light ranges, but shows a downward trend in the near-infrared band. This is because the reflective filler in Example 2 is a compound of two reflective fillers, R-996 and FPR-404. The particle size of R-996 titanium dioxide is about 300nm, and it has excellent ultraviolet and visible light reflection effects, while the latter is a rod-shaped titanium dioxide, which is effective in improving the reflective performance of the coating. The result is not good, so the overall solar reflectivity effect of Example 2 is not ideal; the reflective thermal insulation coating prepared in Example 3 has excellent reflectivity performance in the near-infrared band, but poor effects in the ultraviolet and visible light bands. This is because the reflective fillers in Example 3 are Altiris-800 and Altiris-1000, and the particle sizes of Altiris-800 and Altiris-1000 are approximately 600nm and 800nm, respectively, which can effectively reflect the near-infrared band; Example 4 uses a combination of R-996, Altiris-800 and Altiris-1000 and optimizes the ratio, and finally obtains a coating with excellent reflectivity performance in the full spectrum of the sun.

[0065] The above description is only a preferred embodiment of the present application and is not intended to limit the present application.

Claims

1. A solar full-spectrum high-reflection thermal insulation coating, characterized in that: The raw material components contained therein are as follows by weight: 50% to 70% of film-forming emulsion, 10% to 40% of reflective filler, 0% to 20% of heat-insulating filler, 0.2% to 2% of wetting agent, 0.2% to 1% of dispersant, 1% to 5% of defoaming agent, 1% to 5% of film-forming aid, 0.1% to 1% of thickener and 10% to 20% of water.

2. The solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: The film-forming emulsion is one of acrylic resin, polyurethane, epoxy resin, fluorocarbon resin and silicone resin.

3. The solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: The reflective filler is rutile titanium dioxide, including two or more of R-996, Altiris-800, Altiris-1000, IR-1000, and FPR-404 mixed in a specific proportion; the specific proportion is: R-996: Altiris-800: Altiris-1000: IR-1000: FPR-404 = 0%~80%: 0%~50%: 0%~50%: 0%~50%: 0%~50%.

4. The solar full spectrum high reflective heat insulation coating according to claim 3, characterized in that The particle size distribution of the reflective filler is precisely controlled, and the particle size distribution range is 100 to 1000 nm.

5. According to the solar full-spectrum high-reflective thermal insulation coating of claim 3, the reflective filler in the particle size range of 100-300 nm accounts for 0% to 30%; the particle size range of 300-600 nm accounts for 30% to 60%; the particle size range of 600-1000 nm accounts for 30% to 60%.

6. The solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: The heat-insulating filler is one or more of hollow glass microspheres, mica, silica aerogel, ceramic microspheres, expanded perlite, and aluminum silicate fibers mixed in any proportion.

7. The solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: The wetting agent is one of polyether siloxane copolymer or polyether modified polydimethylsiloxane.

8. The solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: The dispersant is a reflective filler dispersant and a thermal insulation filler dispersant; the reflective filler dispersant is one or more of sodium dodecyl sulfate, sodium hexametaphosphate or sodium tripolyphosphate; the dispersant of the thermal insulation filler is one or more of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, sodium dodecyl sulfate, sodium hexametaphosphate or sodium tripolyphosphate.

9. The solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: The defoaming agent is one of tributyl phosphate, polyether modified silicone oil, and polysiloxane; the film-forming aid is one of ethylene glycol, propylene glycol, and dipropylene glycol butyl ether; the thickener is one of latex acrylic polymer, polyvinyl alcohol, polyacrylamide, polyethylene glycol, and polyethylene copper.

10. The method for preparing the solar full-spectrum high-reflective heat-insulating coating according to claim 1, characterized in that: 1) According to the above ratio, the wetting agent, reflective filler, reflective filler dispersant and water are added to part of the film-forming emulsion and mixed and stirred evenly to obtain a mixed slurry A; 2) The wetting agent, thermal insulation filler, thermal insulation filler dispersant and water are added to another part of the film-forming emulsion and mixed and stirred evenly to obtain a mixed slurry B; 3) The mixed slurries A and B are mixed and dispersed at a high speed to obtain a mixed slurry C, and the film-forming aid, defoaming agent and thickener are added to the mixed slurry C according to the ratio, and stirred evenly to obtain a solar full-spectrum reflective thermal insulation coating.

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