Anti-radiation multifunctional spectrum regulation optical metamaterial coating and preparation method thereof

Abstract

The application relates to the field of paint coatings, in particular to an anti-radiation multifunctional spectrum regulation optical metamaterial coating and a preparation method thereof. A diluent is added into an organic polymer to obtain an organic polymer preparation liquid; a certain amount of high-refractive particles and a dispersing agent are added into the organic polymer preparation liquid to obtain a paint semi-finished product; a certain amount of a curing agent is added into the paint semi-finished product to obtain a paint finished product; the above three steps are repeated to prepare paint finished products with three kinds of particle sizes; the paint finished product with the first particle size of high-refractive particles, the paint finished product with the second particle size of high-refractive particles and the paint finished product with the third particle size of high-refractive particles are sequentially sprayed on the surface of an object to be coated to form a high-reflection bottom layer; ultraviolet-visible light wavelength conversion particles are added into the organic polymer preparation liquid to obtain anti-ultraviolet paint after mixing; the anti-ultraviolet paint can be coated on the surface of the high-reflection bottom layer by means of scraping, spraying and the like, and an anti-ultraviolet intermediate layer is obtained after drying; dyes are added into the organic polymer preparation liquid to obtain colored paint after mixing; the colored paint can be coated on the surface of the anti-ultraviolet intermediate layer by means of scraping, spraying and the like, and finally an optical metamaterial coating with a high-reflection bottom layer, an anti-ultraviolet intermediate layer and a colored surface layer from bottom to top is obtained.

Description

Technical Field

[0001] This application relates to the field of coatings, specifically to a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating and its preparation method. Background Technology

[0002] Currently, numerous outdoor structures and equipment operate in sectors closely related to people's lives, such as energy storage and transportation, power transmission, and information transmission. These facilities, besides enduring wind and rain, are also constantly exposed to intense solar radiation. Without effective protective measures, radiant heat easily accumulates, leading to rapid temperature increases, surface aging resulting in reduced strength, and equipment overheating and shutdown, severely impacting the stability and reliability of these facilities. Currently, there is no technology that combines protection with passive cooling. Coatings, as a conventional and efficient form of protection, have significant potential for development and improvement. Therefore, there is an urgent need to develop a protective optical metamaterial coating that, in addition to providing wear resistance, waterproofing, and resistance to acids, alkalis, and salt spray, also offers excellent resistance to high radiation, protecting outdoor structures and equipment from radiation aging while reducing thermal stress and lowering equipment failure rates.

[0003] Patent CN114634727A discloses a radiative cooling coating structure and its manufacturing method for building exteriors. By adding various additives to acrylate and adjusting their proportions, a high-gloss, alkali-resistant, and rust-preventive protective paint with good adhesion, corrosion resistance, and luster is obtained. This coating can be applied to cement or steel substrates and provides good protection. However, the coating requires the addition of multiple additives and raw materials during its preparation, making the process complex. Furthermore, this coating does not possess strong radiation resistance, and its lifespan in outdoor exposure environments is unknown.

[0004] Patent CN202310903062 discloses a protective coating for building exterior walls and its preparation method. By adding additives, titanium dioxide, tetrahedral radiation-cooling fillers, and other substances to an organic polymer emulsion, a radiation-cooling coating for buildings is obtained. This coating achieves approximately 93% solar reflectance and 96% atmospheric window emissivity. Its high solar reflectance theoretically provides it with certain radiation resistance, but its wear resistance and corrosion resistance remain to be verified.

[0005] Patent CN116004026A discloses a radiation-cooling coating with borate as the main filler. This coating uses borate as scattering particles, achieving approximately 92% solar spectral reflectance while also possessing good anti-corrosion and anti-mildew effects. Although the preparation of this coating is relatively simple, there is still significant room for improvement in its solar spectral reflectance.

[0006] Patent CN115851126A discloses a radiation-cooling coating and its preparation method and radiation-cooling coating. It uses n-hexane as a solvent, PDMS as a film-forming material to obtain high emissivity, and adds TiO2 and Y2O3 as fillers to reflect solar radiation. The coating uses PDMS as a substrate, which has poor mechanical properties and unknown resistance to harsh outdoor environments.

[0007] Currently, there are few protective coatings for high-irradiation environments. The protective coatings used in outdoor facilities in high-irradiation areas cannot simultaneously achieve acid, alkali, salt spray, and erosion resistance as well as high-irradiation resistance and cooling properties. This is mainly because these coatings lack optical design and cannot fundamentally solve the problems of surface aging and overheating in high-irradiation environments from an optical perspective. Therefore, they provide limited radiation protection for buildings, equipment, etc. Summary of the Invention

[0008] In summary, developing a coating that provides multiple protective effects against acids, alkalis, and salt spray, enhances the solar radiation reflection characteristics of the coating from an optical perspective, achieves long-term, high-efficiency radiation resistance, and provides a cooling effect for equipment is of great significance. Therefore, this application provides a multi-functional, spectrally modulated optical metamaterial coating with a layered structure, its preparation method, and its application. This coating can effectively prevent or mitigate the temperature rise and aging phenomena caused by solar radiation on object surfaces, and avoid damage to the coating from harsh outdoor environments.

[0009] 1. A method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, comprising the steps of: adding a diluent to an organic polymer to obtain an organic polymer preparation solution; and adding a fixed amount of high refractive index particles and a dispersant to the organic polymer preparation solution to obtain a coating semi-finished product;

[0010] A certain amount of curing agent is added to the semi-finished coating and mixed to obtain the finished coating.

[0011] Repeat the above three steps to prepare coating products with high-refractive-index particles of the first particle size, the second particle size, and the third particle size, respectively. The first, second, and third particle sizes satisfy the following relationship: first particle size ≥ second particle size ≥ third particle size.

[0012] The high-reflectivity underlayer is formed by sequentially spraying a coating product with high-refractive-index particles of a first particle size, a coating product with high-refractive-index particles of a second particle size, and a coating product with high-refractive-index particles of a third particle size onto the surface of the object to be coated.

[0013] UV-Vis wavelength conversion particles are added to an organic polymer formulation solution and mixed evenly to obtain an anti-UV coating. The anti-UV coating can be applied to the surface of a high-reflectivity underlayer by means of scraping, spraying, etc., and after drying, an anti-UV intermediate layer is obtained.

[0014] 2. The method according to item 1, characterized in that the dye is added to the organic polymer preparation liquid, and after being mixed evenly, a colored surface layer coating is obtained. The colored surface layer coating can be coated on the surface of the anti-ultraviolet intermediate layer by means of scraping, spraying, etc., and finally a multifunctional spectrally modulated optical metamaterial coating with a high-reflection underlayer, an anti-ultraviolet intermediate layer and a colored surface layer is obtained.

[0015] 3. The method according to item 1, characterized in that, one or more of the following coatings are further coated on the colored surface layer: waterproof coating, acid-resistant coating, alkali-resistant coating, and anti-corrosion coating, to form other functional layers.

[0016] 4. The method according to item 1, wherein the high-reflectivity underlayer is obtained by coating the object to be coated with a mixture of high-refractive-index particles of various particle sizes.

[0017] 5. The method according to item 1, wherein the diluent is selected from one or more of nitrocellulose lacquer diluent, chlorinated vinyl lacquer diluent, phenolic lacquer diluent, acrylic lacquer diluent, alkyd lacquer diluent, epoxy lacquer diluent, phenolic lacquer diluent, and silicone lacquer diluent.

[0018] 6. The method according to claim 1, wherein the organic polymer is selected from one or more of phenolic resins, polyamide resins, amino resins, alkyd resins, furan resins, polyester resins, vinyl resins, acrylic resins, epoxy resins and silicone resins.

[0019] 7. The method according to item 1, wherein the particle size range of the high refractive index particles is 100-3000 nm.

[0020] 8. The method according to item 7, wherein the high refractive index particles are selected from one or more of the following materials: titanium dioxide, silicon dioxide, zinc oxide, silicon carbide, silicon nitride, zinc sulfide, aluminum oxide, iron oxide, boron nitride, magnesium oxide, barium sulfate, barium carbonate, and aluminum silicate.

[0021] 9. The method according to claim 1, wherein the ultraviolet-visible wavelength conversion particles are selected from one or more of the following: fluorescein isothiocyanate, Oregon Green, carboxynaphthofluorescein, fluorescein isothiocyanate, rhodamine, oxadiazole and its derivatives, triazole and its derivatives, rhodamine and its derivatives, coumarin derivatives, 1,8-naphthylimide derivatives, pyrazoline derivatives, triphenylamine derivatives, porphyrin compounds, carbazole, pyrazine, thiazole derivatives, and perylene derivatives.

[0022] 10. The method according to claim 1, wherein the dye is selected from one or more of chrome yellow, iron oxide red, iron yellow, iron blue, iron green, iron black, toluidine red, scarlet powder, and molybdenum chrome orange.

[0023] 11. The method according to claim 1, wherein the dispersant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium bromide, polyoxyethylene stearate, polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyphosphate, colloidal silica, and hydroxyethyl cellulose.

[0024] 12. The method according to claim 1, wherein the diluent is selected from one or more of ethyl acetate, butyl acetate, n-butanol, acetone, toluene, xylene, ethyl acetate, isobutanol, and methanol.

[0025] 13. The method according to item 1, wherein the curing agent is selected from one or more of aromatic polyamines, imidazoles, acid anhydrides, polyisocyanate curing agents, nitrogen-containing phenolic resins, aryl ether ester diarylamines, acid anhydride curing agents, polyether amine curing agents, thiol amine epoxy curing agents, trimellitic anhydride, m-phenylenediamine curing agents, methyltetrahydrophthalic anhydride, and dicyandiamide.

[0026] 14. The method according to item 1, wherein the mass ratio of the curing agent to the organic polymer is 0.1:5 to 2:5.

[0027] 15. The method according to item 1, wherein the volume fraction of the high refractive index particles in the finished coating is 0.5%-50%.

[0028] 16. An optical metamaterial coating, comprising:

[0029] The high-reflectivity substrate comprises high-refractive-index particles with a first particle size, high-refractive-index particles with a second particle size, and high-refractive-index particles with a third particle size. The first particle size, the second particle size, and the third particle size satisfy the following relationship: first particle size ≥ second particle size ≥ third particle size.

[0030] UV-resistant intermediate layer;

[0031] Colored surface layer; and

[0032] Other functional layers.

[0033] 17. The optical metamaterial coating according to item 16, wherein,

[0034] The thickness of the high-reflectivity substrate is 10-500 μm;

[0035] The thickness of the UV-resistant intermediate layer is 10-500 μm;

[0036] The thickness of the colored surface layer is 10-500 μm;

[0037] The thickness of the other functional layers is 10-500 μm.

[0038] 18. The optical metamaterial coating according to item 16, wherein a high-reflectivity underlayer, an anti-ultraviolet intermediate layer, a colored surface layer and other functional layers are arranged sequentially from bottom to top, and the high-reflectivity underlayer is directly coated on the surface of the object to be coated.

[0039] 19. The optical metamaterial coating according to item 16, wherein the other functional layers have at least one or more of the following functions: waterproof, acid-resistant, alkali-resistant, and corrosion-resistant.

[0040] 20. The optical metamaterial coating according to item 16, wherein the particle size range of the high refractive index particles in the high reflectivity substrate is 100-3000 nm.

[0041] 21. The optical metamaterial coating according to item 16, wherein the volume fraction of the high refractive index particles in the high reflectivity underlayer is 0.5%-50%.

[0042] 22. The optical metamaterial coating according to any one of items 16-21, which is prepared by the method described in any one of items 1-15.

[0043] 23. A radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, wherein it is prepared by the method described in any one of items 1-15.

[0044] 24. The radiation-resistant coating as described in any one of items 16-23 is used for passive cooling of various equipment and buildings under direct sunlight conditions outdoors.

[0045] The beneficial effects of this application are as follows:

[0046] This application provides a hierarchical optical metamaterial coating. A polymer is used as the film-forming material, and inorganic scattering nanoparticles of different sizes are used as fillers after hierarchical regulation. This hierarchical regulation further enhances the solar radiation reflectivity of the coating and optimizes the reflection paths of different wavelengths of radiation within the coating, resulting in stronger resistance to high radiation. Simultaneously, UV-Vis wavelength conversion particles, colored pigments, and other functional materials can be added sequentially or simultaneously to the polymer base to prepare an anti-UV intermediate layer, a colored surface layer, and other functional layers, further improving the performance of the optical metamaterial coating. In actual testing, after more than 2000 hours of artificial climate aging, the coating surface showed no significant changes, and the surface temperature was reduced by approximately 20°C compared to ordinary coatings, exhibiting extremely strong resistance to high radiation. The average reflectivity in the solar band reaches over 93%, while the emissivity in the 8-13μm mid-infrared band is over 95%. Furthermore, this high-radiation-resistant multifunctional spectral-regulating coating also possesses excellent waterproof performance, strong salt and alkali resistance, good adhesion properties, and high hardness. In summary, this high-radiation resistant multifunctional spectrally modulated optical metamaterial coating provides reliable protection for equipment in high-radiation environments while exhibiting a significant cooling effect. This effectively extends the service life of equipment in outdoor high-radiation environments and reduces the incidence of thermal failures. Attached Figure Description

[0047] The accompanying drawings are provided to better understand this application and do not constitute an undue limitation thereof. Wherein:

[0048] Figure 1 The high-reflectance underlayer of the radiation-resistant multifunctional spectrally modulated optical metamaterial coating prepared in this invention is shown in the SEM image.

[0049] Figure 2 The simulation results of the reflectivity of the optical metamaterial coating in Example 1 of this application are compared with those of the coating without a hierarchical structure in Example 8, wherein the film thickness is 100 micrometers.

[0050] Figure 3 The temperature performance of ordinary metallic fluorocarbon paint coating and the optical metamaterial coating of this application under outdoor solar radiation is shown. Detailed Implementation

[0051] Specific embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the present application are shown in the drawings, it should be understood that the present application 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 application and to fully convey the scope of the present application to those skilled in the art.

[0052] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0053] In this application specification, "first particle size" refers to the average particle size of high-refractive-index particles in a finished coating product composed of high-refractive-index particles; "second particle size" refers to the average particle size of high-refractive-index particles in a finished coating product composed of high-refractive-index particles; and "third particle size" refers to the average particle size of high-refractive-index particles in a finished coating product composed of high-refractive-index particles; and the first particle size ≥ second particle size ≥ third particle size is satisfied.

[0054] The particle size measurement in this invention employs laser diffraction technology, primarily using a Mastersizer 3000+ Ultra laser particle size analyzer to measure the particle size and particle size distribution of the material. This is achieved by measuring the intensity of light scattered when a laser beam passes through dispersed particles. These data are then analyzed to calculate the particle size that generates the scattering model. The micro / nano particle samples to be tested must undergo pretreatment to ensure complete dispersion before testing. Background measurements using the Mastersizer 3000+ Ultra laser particle size analyzer typically last for 10 seconds; sample measurements typically last for 10-12 seconds, with a typical number of tests performed (3 times). The measurement results are displayed by default in DI (intensity distribution), with DI50 selected as the corresponding micro / nano particle size data.

[0055] In this application specification, the term "optical metamaterial" refers to man-made materials containing nanostructures, whose special structures endow them with special optical properties, and whose structures are obtained from at least two different materials (typically including metals and dielectric materials).

[0056] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, the steps of which include: adding a diluent to an organic polymer to obtain an organic polymer preparation solution; and adding a certain amount of high refractive index particles and a dispersant to the organic polymer preparation solution to obtain a coating semi-finished product.

[0057] A certain amount of curing agent is added to the semi-finished coating and mixed to obtain the finished coating.

[0058] Repeat the above three steps to prepare coating products with high-refractive-index particles of the first particle size, the second particle size, and the third particle size, respectively. The first, second, and third particle sizes satisfy the following relationship: first particle size ≥ second particle size ≥ third particle size.

[0059] The high-reflectivity underlayer is formed by sequentially spraying a coating product with high-refractive-index particles of a first particle size, a coating product with high-refractive-index particles of a second particle size, and a coating product with high-refractive-index particles of a third particle size onto the surface of the object to be coated.

[0060] UV-Vis wavelength conversion particles are added to an organic polymer formulation solution and mixed evenly to obtain an anti-UV coating. The anti-UV coating can be applied to the surface of a high-reflectivity underlayer by means of scraping, spraying, etc., and after drying, an anti-UV intermediate layer is obtained.

[0061] The dye is added to the organic polymer preparation solution and mixed evenly to obtain a colored surface coating. The colored surface coating can be applied to the surface of the anti-ultraviolet intermediate layer by means of scraping, spraying, etc., and finally a multifunctional spectrally modulated optical metamaterial coating with a high-reflection underlayer, an anti-ultraviolet intermediate layer and a colored surface layer is obtained.

[0062] In one specific embodiment of this application, the resin is selected from one or more of phenolic resin, polyamide resin, amino resin, alkyd resin, furan resin, polyester resin, vinyl resin, acrylic resin, epoxy resin and silicone resin.

[0063] In one specific embodiment of this application, the refractive index of the multifunctional spectrally modulated optical metamaterial coating can be controlled by the type and concentration of the added nanoparticles (i.e., high refractive index particles). One or more high refractive index particles can be selected to be added to the multifunctional spectrally modulated optical metamaterial coating.

[0064] In one specific embodiment of this application, the refractive index of the multifunctional spectrally modulated optical metamaterial coating can be controlled by the type and concentration of the added nanoparticles (i.e., high refractive index particles). For example, the high refractive index particles can be titanium dioxide, silicon dioxide, zinc oxide, silicon carbide, silicon nitride, zinc sulfide, aluminum oxide, iron oxide, boron nitride, magnesium oxide, barium sulfate, barium carbonate, and aluminum silicate.

[0065] In one specific embodiment of this application, the refractive index of the multifunctional spectrally modulated optical metamaterial coating can be controlled by the type and concentration of added nanoparticles (i.e., high-refractive-index particles). The particle size range of the high-refractive-index particles is 100-3000 nm, for example, 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm, 700 nm, 750 nm, 800 nm, 850 nm, 900 nm, 950 nm, 1000 nm, 1050 nm, 1100 nm, 1150 nm, 1200 nm, and 1250 nm. , 1300nm, 1350nm, 1400nm, 1450nm, 1500nm, 1550nm, 1600nm, 1650nm, 1700 nm, 1750nm, 1800nm, 1850nm, 1900nm, 1950nm, 2000nm, 2050nm, 2100nm, 215 0nm, 2200nm, 2250nm, 2300nm, 2350nm, 2400nm, 2450nm, 2500nm, 2550nm, 2 600nm, 2650nm, 2700nm, 2750nm, 2800nm, 2850nm, 2900nm, 2950nm, 3000nm.

[0066] In one specific embodiment of this application, the ultraviolet-visible wavelength conversion particles are selected from one or more of the following: fluorescein isothiocyanate, Oregon Green, carboxynaphthofluorescein, fluorescein isothiocyanate, rhodamine, oxadiazole and its derivatives, triazole and its derivatives, rhodamine and its derivatives, coumarin derivatives, 1,8-naphthalimide derivatives, pyrazoline derivatives, triphenylamine derivatives, porphyrin compounds, carbazole, pyrazine, thiazole derivatives, and perylene derivatives.

[0067] In one specific embodiment of this application, the dye can bring one or more colored surface layers to the multifunctional spectrally modulated optical metamaterial coating. For example, the dye can be one or more of chrome yellow, iron oxide red, iron yellow, iron blue, iron green, iron black, toluidine red, scarlet powder, and molybdenum chrome orange.

[0068] In one specific embodiment of this application, the colored surface layer is coated with other functional layers, which may be other functional layers with waterproof function made of waterproof coating.

[0069] In one specific embodiment of this application, the colored surface layer is coated with other functional layers, which may be other functional layers with acid-resistant function composed of acid-resistant coating.

[0070] In one specific embodiment of this application, the colored surface layer is coated with other functional layers, which may be other functional layers with alkali-resistant function composed of alkali-resistant coating.

[0071] In one specific embodiment of this application, the colored surface layer is coated with other functional layers, which may be other functional layers with anti-corrosion function composed of anti-corrosion coating.

[0072] In one specific embodiment of this application, the dispersant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium bromide, polyoxyethylene stearate, polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyphosphate, colloidal silicon, and hydroxyethyl cellulose.

[0073] In one specific embodiment of this application, the diluent is selected from one or more of ethyl acetate, butyl acetate, n-butanol, acetone, toluene, xylene, ethyl acetate, isobutanol, and methanol.

[0074] In one specific embodiment of this application, the curing agent is selected from one or more of aromatic polyamines, imidazoles, acid anhydrides, polyisocyanate curing agents, nitrogen-containing phenolic resins, aryl ether ester diarylamines, acid anhydride curing agents, polyether amine curing agents, thiol amine epoxy curing agents, trimellitic anhydride, m-phenylenediamine curing agents, methyltetrahydrophthalic anhydride, and dicyandiamide.

[0075] In one specific embodiment of this application, the mass ratio of the curing agent to the organic polymer added to the finished coating is 0.1:5 to 2:5, for example, it can be 0.1:5, 0.2:5, 0.3:5, 0.4:5, 0.5:5, 0.6:5, 0.7:5, 0.8:5, 0.9:5, 1:5, 1.1:5, 1.2:5, 1.3:5, 1.4:5, 1.5:5, 1.6:5, 1.7:5, 1.8:5, 1.9:5, or 2:5.

[0076] This application provides an optical metamaterial coating comprising a high-reflectivity underlayer, wherein the high-reflectivity underlayer comprises high-refractive-index particles having a first particle size, high-refractive-index particles having a second particle size, and high-refractive-index particles having a third particle size, wherein the first particle size, the second particle size, and the third particle size satisfy the following relationship: first particle size ≥ second particle size ≥ third particle size; an anti-ultraviolet intermediate layer; a colored surface layer; and other functional layers.

[0077] In one specific embodiment of this application, the first particle size is greater than the second particle size. Preferably, the range of the first particle size is 1000-3000 nm, for example, it can be 1001 nm, 1050 nm, 1100 nm, 1150 nm, 1200 nm, 1250 nm, 1300 nm, 1350 nm, 1400 nm, 1450 nm, 1500 nm, 1550 nm, 1600 nm, 1650 nm, 1700 nm, 1750 nm. 1800nm, 1850nm, 1900nm, 1950nm, 2000nm, 2050nm, 2100nm, 2150nm, 2200nm, 2250nm, 2300nm, 2350nm, 240 0nm, 2450nm, 2500nm, 2550nm, 2600nm, 2650nm, 2700nm, 2750nm, 2800nm, 2850nm, 2900nm, 2950nm, 3000nm.

[0078] In one specific embodiment of this application, the second particle size satisfies that it is greater than the third particle size and less than the first particle size. Preferably, the range of the second particle size is 600-1000nm, for example, it can be 601nm, 650nm, 700nm, 750nm, 800nm, 850nm, 900nm, 950nm, or 1000nm.

[0079] In one specific embodiment of this application, the third particle size is smaller than the second particle size. Preferably, the range of the third particle size is 100-600nm, such as 101nm, 150nm, 200nm, 250nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, or 600nm.

[0080] In one specific embodiment of this application, the volume fraction of the high refractive index particles in the finished coating is 0.5%-50%, for example, it can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%. 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 38.5%, 39%, 39.5%, 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, 45%, 45.5%, 46%, 46.5%, 47%, 47.5%, 48%, 48.5%, 49%, 49.5%, 50%.

[0081] In one specific embodiment of this application, the thickness of the high-reflectivity substrate is 10-500 μm, for example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm. 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm , 185μm, 190μm, 195μm, 200μm, 205μm, 210μm, 215μm, 220μm, 225μm, 230μm, 235μm, 240μm, 245μm m, 250μm, 255μm, 260μm, 265μm, 270μm, 275μm, 280μm, 285μm, 290μm, 295μm, 300μm, 305μm, 310 μm, 315μm, 320μm, 325μm, 330μm, 335μm, 340μm, 345μm, 350μm, 355μm, 360μm, 365μm, 370μm, 37 5μm, 380μm, 385μm, 390μm, 395μm, 400μm, 405μm, 410μm, 415μm, 420μm, 425μm, 430μm, 435μm, 4 40μm, 445μm, 450μm, 455μm, 460μm, 465μm, 470μm, 475μm, 480μm, 485μm, 490μm, 495μm, 500μm.

[0082] In one specific embodiment of this application, the thickness of the UV-resistant interlayer is 10-500 μm, for example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, or 115 μm. , 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm m, 185μm, 190μm, 195μm, 200μm, 205μm, 210μm, 215μm, 220μm, 225μm, 230μm, 235μm, 240μm, 245 μm, 250μm, 255μm, 260μm, 265μm, 270μm, 275μm, 280μm, 285μm, 290μm, 295μm, 300μm, 305μm, 31 0μm, 315μm, 320μm, 325μm, 330μm, 335μm, 340μm, 345μm, 350μm, 355μm, 360μm, 365μm, 370μm, 3 75μm, 380μm, 385μm, 390μm, 395μm, 400μm, 405μm, 410μm, 415μm, 420μm, 425μm, 430μm, 435μm, 440μm, 445μm, 450μm, 455μm, 460μm, 465μm, 470μm, 475μm, 480μm, 485μm, 490μm, 495μm, 500μm.

[0083] In one specific embodiment of this application, the thickness of the colored surface layer is 10-500 μm, for example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm. 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm , 185μm, 190μm, 195μm, 200μm, 205μm, 210μm, 215μm, 220μm, 225μm, 230μm, 235μm, 240μm, 245μm m, 250μm, 255μm, 260μm, 265μm, 270μm, 275μm, 280μm, 285μm, 290μm, 295μm, 300μm, 305μm, 310 μm, 315μm, 320μm, 325μm, 330μm, 335μm, 340μm, 345μm, 350μm, 355μm, 360μm, 365μm, 370μm, 37 5μm, 380μm, 385μm, 390μm, 395μm, 400μm, 405μm, 410μm, 415μm, 420μm, 425μm, 430μm, 435μm, 4 40μm, 445μm, 450μm, 455μm, 460μm, 465μm, 470μm, 475μm, 480μm, 485μm, 490μm, 495μm, 500μm.

[0084] In one specific embodiment of this application, the thickness of the other functional layers is 10-500 μm, for example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, etc. 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm , 185μm, 190μm, 195μm, 200μm, 205μm, 210μm, 215μm, 220μm, 225μm, 230μm, 235μm, 240μm, 245μm m, 250μm, 255μm, 260μm, 265μm, 270μm, 275μm, 280μm, 285μm, 290μm, 295μm, 300μm, 305μm, 310 μm, 315μm, 320μm, 325μm, 330μm, 335μm, 340μm, 345μm, 350μm, 355μm, 360μm, 365μm, 370μm, 37 5μm, 380μm, 385μm, 390μm, 395μm, 400μm, 405μm, 410μm, 415μm, 420μm, 425μm, 430μm, 435μm, 4 40μm, 445μm, 450μm, 455μm, 460μm, 465μm, 470μm, 475μm, 480μm, 485μm, 490μm, 495μm, 500μm.

[0085] In one specific embodiment of this application, the optical metamaterial coating is used for passive cooling of various devices, buildings, etc., under direct outdoor sunlight. The optical metamaterial coating and a common metallic fluorocarbon coating are placed together in the same outdoor solar irradiation environment, and the temperature changes are as follows: Figure 3 As shown.

[0086] Example 1

[0087] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, which includes the following steps:

[0088] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0089] S2. Mix 190g of titanium dioxide powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the semi-finished coating.

[0090] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain a finished coating A with a particle size of 1000nm.

[0091] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity underlayer, a second high-reflectivity underlayer, and a third high-reflectivity underlayer, each 100μm thick and with a titanium dioxide particle volume fraction of 25%. After drying, a high-reflectivity underlayer is obtained. (See [reference needed]). Figure 1 The SEM image is shown.

[0092] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0093] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0094] A waterproof coating is applied to the colored surface layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, an anti-UV intermediate layer, a colored surface layer, and a waterproof layer is called an anti-radiation multifunctional spectrally modulated optical metamaterial coating.

[0095] Example 2

[0096] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, which includes the following steps:

[0097] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0098] S2. Mix 115g of titanium dioxide powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the semi-finished coating.

[0099] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain a finished coating A with a particle size of 1000nm.

[0100] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick and with a titanium dioxide particle volume fraction of 15%. After drying, a high-reflectivity underlayer is obtained.

[0101] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0102] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0103] A waterproof coating is applied to the surface of the UV-resistant intermediate layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, a UV-resistant intermediate layer, a colored surface layer, and a waterproof layer is called a radiation-resistant multifunctional spectrally modulated optical metamaterial coating.

[0104] Example 3

[0105] A method for preparing a radiation-resistant coating, comprising the following steps:

[0106] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0107] S2. Mix 190g of titanium dioxide powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the semi-finished coating.

[0108] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent. Use a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃. Stir for 10 minutes to obtain the final coating product A.

[0109] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick and with a titanium dioxide particle volume fraction of 25%. After drying, a high-reflectivity underlayer is obtained.

[0110] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0111] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of dye and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0112] A waterproof coating is applied to the colored surface layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, an anti-UV intermediate layer, a colored surface layer, and a waterproof layer is called an anti-radiation multifunctional spectrally modulated optical metamaterial coating.

[0113] Example 4

[0114] A method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, comprising the following steps:

[0115] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0116] S2. Mix 115g of silica powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain a semi-finished coating.

[0117] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent. Use a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃. Stir for 10 minutes to obtain the final coating product A.

[0118] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick and with a silicon dioxide particle volume fraction of 15%. After drying, a high-reflectivity underlayer is obtained.

[0119] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0120] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0121] A waterproof coating is applied to the surface of the UV-resistant intermediate layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, a UV-resistant intermediate layer, a colored surface layer, and a waterproof layer is called a radiation-resistant multifunctional spectrally modulated optical metamaterial coating.

[0122] Example 5

[0123] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, which includes the following steps:

[0124] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0125] S2. Mix 266g of titanium dioxide powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the semi-finished coating.

[0126] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain a finished coating A with a particle size of 1000nm.

[0127] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick and with a titanium dioxide particle volume fraction of 35%. After drying, a high-reflectivity underlayer is obtained.

[0128] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0129] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0130] A waterproof coating is applied to the surface of the UV-resistant intermediate layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, a UV-resistant intermediate layer, a colored surface layer, and a waterproof layer is called a radiation-resistant multifunctional spectrally modulated optical metamaterial coating.

[0131] Example 6

[0132] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, which includes the following steps:

[0133] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0134] S2. Mix 266g of titanium dioxide powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the semi-finished coating.

[0135] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain a finished coating A with a particle size of 1000nm.

[0136] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick, with titanium dioxide particle volume fractions of 35%, 25%, and 15%, respectively. After drying, a high-reflectivity underlayer is obtained.

[0137] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0138] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0139] A waterproof coating is applied to the surface of the UV-resistant intermediate layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, a UV-resistant intermediate layer, a colored surface layer, and a waterproof layer is called a radiation-resistant multifunctional spectrally modulated optical metamaterial coating.

[0140] Example 7

[0141] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, which includes the following steps:

[0142] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0143] S2. Mix 266g of titanium dioxide powder with a diameter of 1000nm and 3.8g of sodium dodecylbenzenesulfonate with the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the semi-finished coating.

[0144] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain a finished coating A with a particle size of 1000nm.

[0145] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick, with titanium dioxide particle volume fractions of 15%, 25%, and 35%, respectively. After drying, a high-reflectivity underlayer is obtained.

[0146] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0147] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0148] A waterproof coating is applied to the surface of the UV-resistant intermediate layer to obtain a waterproof coating. Overall, the composite material consisting of a high-reflectivity underlayer, a UV-resistant intermediate layer, a colored surface layer, and a waterproof layer is called a radiation-resistant multifunctional spectrally modulated optical metamaterial coating.

[0149] Example 8

[0150] A method for preparing a coating, comprising the following steps:

[0151] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0152] S2. 64g each of titanium dioxide particles with diameters of 400nm, 700nm, and 1000nm, totaling 192g of titanium dioxide powder, are mixed with 3.8g of sodium dodecylbenzenesulfonate and the organic polymer preparation liquid prepared in S1. The stirring tool is a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃. The stirring is carried out for 25 minutes to finally obtain the semi-finished coating.

[0153] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain the final coating product. Spray the coating product onto the surface of a metal substrate with a thickness of 300μm and a titanium dioxide particle volume fraction of 25%.

[0154] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.5g of fluorescein isothiocyanate and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a wavelength conversion coating solution. Spray this solution onto the surface of a high-reflectivity underlayer, dry, and cure to obtain an anti-UV intermediate layer.

[0155] S5. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the UV-resistant intermediate layer, dry, and cure to obtain a colored surface layer.

[0156] Comparative Example 1

[0157] This application provides a method for preparing a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating, which includes the following steps:

[0158] S1. Mix 180g of acrylic resin varnish with 27g of methanol using a magnetic stirrer at 800r / min and an ambient temperature of 25℃ for 15 minutes to obtain the final organic polymer solution.

[0159] S2. Mix 266g of titanium dioxide powder with a diameter of 1000nm, 3.8g of sodium dodecylbenzenesulfonate and the organic polymer preparation liquid prepared in S1. Use a magnetic stirrer with a speed of 800r / min and an ambient temperature of 25℃ for 25 minutes to obtain the coating semi-finished product.

[0160] S3. Mix the product obtained in S2 with 90g of polyisocyanate curing agent using a magnetic stirrer at a speed of 800r / min and an ambient temperature of 25℃ for 10 minutes to obtain a finished coating A with a particle size of 1000nm.

[0161] Repeat steps S1-S3 above, replacing the original 1000nm titanium dioxide with 700nm and 400nm titanium dioxide particles respectively to prepare coating product B with a 700nm particle size and coating product C with a 400nm particle size. The three coating products A and C are sequentially sprayed onto the surface of a metal substrate to form a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer, each 100μm thick, with titanium dioxide particle volume fractions of 15%, 25%, and 35%, respectively. After drying, a high-reflectivity coating is obtained.

[0162] S4. Mix 100g of acrylic resin varnish with 27g of methanol and stir for 30 minutes. Add 0.3g of iron blue and 0.07g of sodium dodecyl sulfate, stir for 20 minutes, and then add polyisocyanate curing agent and mix to obtain a colored coating solution. Spray the colored surface layer coating onto the surface of the high-reflectivity substrate, dry, and cure to obtain a colored surface layer.

[0163] A waterproof coating is applied to the surface of the high-reflectivity substrate to obtain a waterproof coating. Overall, the composite material consisting of the high-reflectivity substrate, the colored surface layer, and the waterproof layer is termed a radiation-resistant, multifunctional, spectrally modulated optical metamaterial coating.

[0164] Table 1 Reflection results of different coatings

[0165]

[0166]

[0167] Comparing Examples 1 and 2, it can be found that reducing the titanium dioxide content in the high-reflectivity substrate from 25% to 15% leads to a decrease in the overall coating reflectivity. Comparing Examples 1 and 3, it can be found that reducing the thickness of the high-reflectivity substrate from 100 μm to 80 μm leads to a decrease in the overall coating reflectivity. Comparing Examples 2 and 4, it can be found that a high-reflectivity substrate using titanium dioxide as a high-refractive-index particle exhibits better reflectivity in the solar irradiation band than a high-reflectivity substrate using silicon dioxide as a high-refractive-index particle. Comparing Examples 1 and 5, it can be found that increasing the titanium dioxide content in the high-reflectivity substrate from 25% to 35% leads to a decrease in the overall coating reflectivity. This is because excessively high-refractive-index particle content causes agglomeration, thus affecting the overall reflectivity of the coating. Comparing Examples 1 with Examples 6 and 7, it can be found that the coating exhibits optimal reflectivity when the volume fraction of particles of all three particle sizes in their respective layers is 25%. Comparing Example 7 and Comparative Example 1, it can be found that the UV-resistant intermediate layer composed of UV-visible wavelength conversion particles improves the overall coating reflectivity. The simulated coating reflectivity results for Example 1 and Example 8 are as follows: Figure 2As shown, blending high-refractive-index particles of different sizes reduces the overall reflectivity of the coating, proving that the layered structure design of the coating is essential.

[0168] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0169] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for preparing an optical metamaterial coating, comprising the following steps: An organic polymer formulation is obtained by adding a diluent to an organic polymer. A certain amount of high refractive index particles and a dispersant are added to the organic polymer preparation solution and mixed to obtain a coating semi-finished product; A certain amount of curing agent is added to the semi-finished coating and mixed to obtain the finished coating. Repeat the above three steps to prepare coating products with high-refractive-index particles of the first particle size, high-refractive-index particles of the second particle size, and high-refractive-index particles of the third particle size, respectively, wherein the first particle size, the second particle size, and the third particle size satisfy the following relationship: First particle size ≥ Second particle size ≥ Third particle size, where, A high-reflectivity underlayer is formed by sequentially spraying a coating product with high-refractive-index particles of the first particle size, a coating product with high-refractive-index particles of the second particle size, and a coating product with high-refractive-index particles of the third particle size onto the surface of the object to be coated. UV-Vis wavelength conversion particles are added to an organic polymer formulation solution and mixed evenly to obtain an anti-UV coating. The anti-UV coating is then applied to the surface of a high-reflectivity underlayer and dried to obtain an anti-UV intermediate layer. in, The first particle size is 1000 nm; The second particle size is 700 nm; The third particle size is 400 nm; The high refractive index particles have a volume fraction of 25% in the finished coating. The coating thickness of each of the aforementioned high-reflectivity substrates is 100 μm; The organic polymer is an acrylic resin; The ultraviolet-visible wavelength conversion particle is fluorescein isothiocyanate; The curing agent is polyisocyanate; The mass ratio of the curing agent to the organic polymer is 1:2; The high refractive index particles are titanium dioxide.

2. The method according to claim 1, wherein, A colored surface layer is coated on the UV-resistant intermediate layer. Dye is added to an organic polymer preparation solution and mixed evenly to obtain a colored surface layer coating. The colored surface layer coating is then coated on the surface of the UV-resistant intermediate layer to finally obtain an optical metamaterial coating with a high-reflection underlayer, a UV-resistant intermediate layer, and a colored surface layer.

3. The method according to claim 2, characterized in that, The colored surface layer is further coated with one or more of the following coatings: waterproof coating, acid-resistant coating, alkali-resistant coating, and anti-corrosion coating, forming other functional layers.

4. The method according to claim 1, wherein, The dispersant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium bromide, polyoxyethylene stearate, polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyphosphate, colloidal silicon, and hydroxyethyl cellulose.

5. The method according to claim 1, wherein, The diluent is selected from one or more of ethyl acetate, butyl acetate, n-butanol, acetone, toluene, xylene, isobutanol, and methanol.

6. An optical metamaterial coating, comprising: The high-reflectivity substrate is composed of a first high-reflectivity layer, a second high-reflectivity layer, and a third high-reflectivity layer. The first high-reflectivity layer has high-refractive-index particles with a first particle size, the second high-reflectivity layer has high-refractive-index particles with a second particle size, and the third high-reflectivity layer has high-refractive-index particles with a third particle size. The first particle size, the second particle size, and the third particle size satisfy the following relationship: first particle size ≥ second particle size ≥ third particle size. UV-resistant intermediate layer; Colored surface layer; and Other functional layers; The first high-reflectivity layer is in direct contact with the surface of the object to be coated, and the second and third high-reflectivity layers are stacked in sequence. in, The first particle size must be within the range of 1000 nm; The second particle size must be within the range of 700 nm; The third particle size must be within the range of 400 nm; The thickness of the high-reflectivity substrate is 100 μm; The volume fraction of high-refractive-index particles in the high-reflectivity sublayer is 25%. The high refractive index particles are titanium dioxide; The thickness of the UV-resistant intermediate layer is 10-500 μm; The thickness of the colored surface layer is 10-500 μm; The thickness of the other functional layers is 10-500 μm.

7. The optical metamaterial coating according to claim 6, wherein, It consists of a high-reflectivity underlayer, an anti-UV intermediate layer, a colored surface layer, and other functional layers arranged sequentially from bottom to top, with the high-reflectivity underlayer being directly applied to the surface of the object to be coated.

8. The optical metamaterial coating according to claim 6, wherein, The other functional layers have at least one or more of the following functions: waterproof, acid-resistant, alkali-resistant, and corrosion-resistant.

9. An optical metamaterial coating, wherein, It is prepared by the method described in any one of claims 1-5.

10. The optical metamaterial coating as described in any one of claims 6-9 is used for passive cooling of various devices and buildings under direct sunlight conditions outdoors.

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