86 results about "Solar reflectance" patented technology

Permafrost thawing prevention may involve deploying a cooling geotextile onto a permafrost soil. The geotextile may include a biomass scaffold comprising natural plant-based fibers. The geotextile may further include a cellulose layer comprising cellulose fibers laminated onto the biomass scaffold such that the cellulose fibers are physically entangled with the plant-based fibers. The geotextile may further include a hydrophobic and biodegradable coating which defines at least one surface of the geotextile. The geotextile may be optically opaque, exhibits high solar reflectivity, and maintains high mid-infrared emissivity to enable passive radiative cooling.

A mulch may include a hydrophilic cellulose layer and hydrophobic top layer formed on the cellulose layer. The cellulose layer and top layer together may form a wettability gradient which facilitates directional water transport from the hydrophobic top layer to the hydrophilic cellulose layer. A surface of the hydrophobic top layer is optically opaque and exhibits a solar reflectance of 85% to 98% in response to incident light the 250-2500 nm wavelength range. The mulch provides a mid-infrared emissivity of 0.85 to 0.97 in the 8-13 μm range. The solar reflectance and mid-infrared emissivity decrease underlying soil temperature by at least 2° C. compared to uncovered soil under equivalent solar conditions.

The invention relates to the technical field of radiation refrigeration films, and discloses a porous polyvinylidene fluoride based composite radiation refrigeration film and a preparation method thereof. The method comprises the following steps: firstly, carrying out melt blending on PVDF, NaCl and ZnO nanoparticles and forming a film, then dissolving out NaCl through water washing, and constructing a continuous three-dimensional porous structure in a PVDF matrix; and immersing the obtained porous PVDF / ZnO membrane material into a methanol aqueous solution containing 2-methylimidazole, so that ZnO is subjected to a coordination reaction at the pore wall and is converted into the ZIF-8 nanocrystal in situ. In the thin film prepared by the steps, the micron-sized salt-induced pore structure, the nano-sized ZIF-8 particles and the interface of the ZIF-8 particles jointly form a multi-stage scattering network, so that the scattering ability of the thin film in the solar spectrum range of 0.25-2.5 microns can be remarkably enhanced, the high infrared emission performance of the PVDF matrix in an atmospheric window of 8-13 microns is maintained, and the thin film has high solar reflectivity and high infrared emissivity, and can be used for preparing the solar film. An excellent radiation refrigeration effect can be achieved, and the heat-dissipating material is suitable for being applied to building outer surfaces, equipment heat dissipation, individual heat management and the like.

The invention relates to the technical field of coatings, in particular to a double-layer super-hydrophobic passive daytime radiation cooling coating and application thereof. The super-hydrophobic passive daytime radiation cooling coating is developed through a two-step spraying process. And the bottom layer is formed by combining a high refractive index TiO / Al2O3 composite material and modified polydimethylsiloxane. The top layer employs high band gap SiO to mitigate ultraviolet absorption and combines unmodified PDMS to ensure high thermal emissivity and low surface energy. By accurately controlling the particle size distribution and concentration gradient between the two layers of structures, the optimized SPDRC coating shows excellent optical performance, the solar reflectivity is 93.2%, and the mid-infrared thermal emissivity is 95.4%. Under the direct irradiation of the sun, the temperature reduction of 10 DEG C is obviously lower than that of the environment, and the radiation cooling power of 125 Wm <-2 > is realized. In addition, the coating has a water contact angle of 155 degrees, has strong super-hydrophobicity, can ensure excellent self-cleaning performance and long-term durability, and is suitable for actual outdoor application of building cooling.

The invention discloses a passive radiation cooling powder coating and a preparation method of a refrigeration coating, and relates to the technical field of powder paints.The specific powder combination of titanium dioxide, barium sulfate, aluminum oxide and zirconium silicate is added into a powder coating formula, so that the solar reflectivity of the coating cured on a substrate is increased to 85% or above, and the coating has the advantages of being high in heat resistance, good in heat resistance and the like. Meanwhile, the infrared emissivity is improved to 90% or above, a synergistic cooling effect is generated, and the material is an ideal radiation refrigeration material.

This invention discloses a colored radiation-cooling coating based on a transparent composite film and its preparation method, belonging to the technical field of colored radiation-cooling coatings for building energy conservation. The colored radiation-cooling coating based on a transparent composite film includes a surface transparent composite film layer and a bottom radiation-cooling composite layer. The bottom layer is prepared from components A and B. Component A includes transparent resin and radiation-functional fillers; the radiation-functional fillers include barium sulfate particles and hollow structured dielectric microspheres. The surface layer is prepared from components A1 and B. Component A1 includes transparent resin, a light stabilizer, and an ultraviolet absorber. The colored radiation-cooling coating based on a transparent composite film allows the radiation-cooling coating to display different colors without affecting its solar reflectivity. Simultaneously, the combination of the radiation-cooling composite layer and the transparent composite film layer improves the radiation reflection performance of the radiation-cooling coating.

The invention discloses a ternary ceramic aerogel with radiation refrigeration and heat insulation functions and a preparation method and application thereof.The ternary ceramic aerogel has the radiation refrigeration and heat insulation functions, has the extremely high solar reflectivity (98%) and infrared emissivity (98.4%), can achieve efficient daytime radiation cooling, has the extremely low heat conductivity coefficient (24.7 mW m <-1 > K <-1 >), and has the advantages of being high in heat conductivity coefficient (24.7 mW m <-1 > K <-1 >) and good in heat conductivity coefficient (24.7 mW m <-1 > K <-1 >). The material can provide an all-day thermal insulation effect, has excellent tensile strength, compression strength and bending strength, has no modulus attenuation after tens of thousands of cycles, can maintain cyclic compression strain in a temperature range of-198 DEG C to 1200 DEG C, has no mechanical strength loss, and has the characteristics of high temperature resistance and high mechanical strength; the system is suitable for meeting the temperature adjusting requirements of different scenes and harsh environments, and can be widely applied to the fields of buildings, vehicles or aerospace and the like.

The invention relates to the technical field of coatings, and discloses a heat-insulating powder coating as well as a preparation method and application thereof. The heat insulation powder coating is prepared from the following preparation raw materials in parts by mass: 160 to 220 parts of organic silicon modified polyester resin, 10 to 30 parts of modified hollow glass beads, 30 to 70 parts of modified sericite powder, 40 to 60 parts of titanium dioxide, 3 to 5 parts of hydrophobic SiO2 aerogel and 10 to 20 parts of curing agent, wherein the organic silicon modified polyester resin is prepared by melting and blending weather-proof polyester resin and organic silicon resin according to the mass ratio of (4-9): 1; the temperature of melt blending is 90 to 130 DEG C. According to the coating, the excellent heat insulation performance that the solar reflectance is larger than or equal to 0.87 and the heat conductivity coefficient is smaller than or equal to 0.075 W / m.K is achieved, the excellent mechanical strength, adhesive force, impact resistance and long-acting weather resistance are achieved, and heat loads on the surfaces of building outer walls, industrial furnace shells, household appliances and the like can be remarkably reduced.

The invention discloses a passive radiation-cold storage composite box body and a preparation method. The box body sequentially comprises a composite radiation film, a heat insulation layer and a cold storage layer from outside to inside. The outer-layer radiation film is composed of an elastic organic matrix and high-reflection inorganic particles such as barium sulfate, has high solar reflectivity and mid-infrared high emissivity, and can effectively restrain solar absorption and achieve radiation heat dissipation in the daytime. The heat insulation layer is made of XPS, EPS, aerogel felt and other low-heat-conduction materials so as to reduce external heat transfer. Phase change microcapsules are dispersed in the cold storage layer, and flake graphite and other high-thermal-conductivity fillers can be added to improve the cold transfer efficiency and temperature uniformity. And the phase-change material realizes automatic cold storage and cold release through a latent heat mechanism, so that the temperature in the box body is kept stable. Through the synergistic effect of radiation refrigeration, heat insulation and phase change cold storage, long-time and recyclable passive cold chain temperature control is achieved, and the device has the advantages of being simple and convenient in structure, high in cost performance, flexible in application, uniform in internal temperature distribution and the like.

Nanofibrous materials and their fabrication by electrospinning are disclosed for passive temperature control on earth and in outer space. The materials combine high solar reflectivity with high thermal emittance in the infrared region, including in the long wavelength atmospheric window region between 8 μm and 13 μm. The materials include nanofibrous PTFE / PEO and silica materials. The physical properties of the materials are suitable for extraterrestrial as well as terrestrial applications.

The invention discloses a phase-change radiation refrigeration coating which is prepared by the following steps: dispersing nano aluminum oxide particles in phase-change paraffin in advance to form a high-thermal-conductivity and high-radiation composite phase-change material, and encapsulating the high-thermal-conductivity and high-radiation composite phase-change material in a porous ceramic skeleton through vacuum infusion to obtain composite phase-change ceramic particles; then, the composite phase-change ceramic particles are dispersed in polyol resin containing aluminum oxide microspheres, the aluminum oxide microspheres accurately block pores in the surface of the porous ceramic through particle size matching, paraffin leakage is prevented, and the aluminum oxide microspheres serve as heat conduction channels and radiation units at the same time, so that it is guaranteed that the finally prepared coating integrates phase-change temperature control, efficient heat conduction and radiation refrigeration; the high sunlight reflectivity (94%-98%) and the high atmospheric window infrared emissivity (92%-96%) are achieved, and the thermal response rate and the leakproof performance are remarkably improved.

A colored bilayer sub-ambient radiative cooling coating designed to enhance solar reflectance and aesthetic coloration is introduced. The coating includes a white bottom layer containing TiO2 or ZrO2 nanoparticles, and hollow glass spheres dispersed in a polymer matrix, and a colored top layer containing SiO2 microspheres and fluorescent pigments selected from Sr2Si5N8:Eu2+, Y3A15O12:Ce3+, (Ba,Sr)SiO4:Eu2+, or SrO·Al2O3:Eu phosphors dispersed in a polymer matrix. This bilayer structure achieves an effective solar reflectance of at least 90% and reduces surface temperature by at least 3° C. compared to ambient air, providing energy-efficient cooling with aesthetic appeal.

This invention discloses a self-cleaning radiative cooling coating based on biomass carbon quantum dots, its preparation method, and its application. The coating comprises a polymer film-forming resin, carbon quantum dots, and hollow glass microspheres; wherein the mass ratio of the polymer film-forming resin to the filler is 1:(0.1-0.5), and the mass ratio of the hollow glass microspheres to the carbon quantum dots is 1:(0.05-0.2). This invention synergistically enhances solar reflectivity through the photoluminescence properties of carbon quantum dots and the scattering properties of hollow glass microspheres, while simultaneously utilizing the synergistic effect of fluorinated resin and modified hollow glass microspheres to endow the coating with superhydrophobic self-cleaning function. A single layer of this coating can achieve a solar reflectivity >92%, mid-infrared emissivity >94%, and contact angle >150°, possessing both efficient daytime radiative cooling and long-lasting self-cleaning performance. It is particularly suitable for passive heat dissipation of outdoor equipment such as new energy vehicle charging piles, and features simple process, environmental friendliness, and excellent performance.

The invention discloses a solid waste-based micro-nano radiation cooling coating and a preparation method thereof.The preparation method comprises the steps that fly ash and coal gangue serve as main solid waste raw materials, and after being subjected to ultra-fining and silane modification, the main solid waste raw materials and a phosphate exciting agent are subjected to chemical action to form an inorganic micro-nano gel matrix; nano-silica (SiO2) and barium sulfate (BaSO4) are cooperatively introduced as a spectrum regulation functional filler, and a multi-scale scattering structure and an intermediate infrared radiation channel are constructed, so that the radiation cooling effect of high solar reflectivity and high infrared emissivity is realized. The prepared coating has excellent spectral selectivity (the solar reflectivity is larger than or equal to 0.88, and the mid-infrared emissivity is larger than or equal to 0.95), high weather resistance (the 500-hour ultraviolet aging retention rate is larger than or equal to 95%) and remarkable passive cooling capacity (the temperature drop can reach 5-8 DEG C). The raw materials are wide in source, the preparation process is simple, a large amount of building solid waste or industrial solid waste can be utilized, the low-cost and high-performance green radiation cooling coating is achieved, and a technical path capable of being popularized on a large scale is provided for building outer wall energy-saving transformation and urban heat island relieving.

Disclosed herein are highly solar-reflective passive radiative cooling materials in powder form based on calcium phosphates. These materials can be synthesized at a low material cost approaching that of paint additives available on the market, and they are safe, non-toxic, and environmentally-friendly. These materials achieve solar reflectance values ranging from 93% to nearly 98%, making them extremely effective passive radiative cooling materials.

The invention provides a water-based radiation refrigeration coating and a preparation method thereof, and belongs to the technical field of refrigeration coatings. The water-based radiation refrigeration coating comprises the following components: 25%-40% of a water-based emulsion, 10%-20% of polymethyl methacrylate powder, 10%-20% of functional filler, 0.1%-0.5% of a pH regulator, 0.1%-1.0% of a flatting agent, 0.1%-0.7% of a defoaming agent, 0.5%-1.8% of a thickening agent, 0.1%-0.5% of a dispersing agent, 0.1%-1.5% of a coalescing agent and the balance of deionized water. The water-based radiation refrigeration coating provided by the invention has high solar reflectivity (Rgt, 95%) and high infrared emissivity (ATSWgt, 95%), can effectively reflect and block sunlight, reduces the temperature of an external wall of a building through radiation heat dissipation and reduces the energy consumption of refrigeration equipment, and has important significance on energy conservation and environmental protection.

The invention relates to the technical field of coatings, and particularly discloses a daytime radiation refrigeration coating and a preparation method and application thereof.The preparation method comprises the steps that a scatterer and hollow glass microspheres are added into water in advance and stirred to form initial slurry, and the mass ratio of the sum of the mass of the scatterer and the mass of the hollow glass microspheres to the mass of the water is 1: 5-1: 10; adding a long-chain molecular dispersing agent into the initial slurry, stirring, carrying out ultrasonic treatment, heating, evaporating and concentrating until the water content is 20-60%, so as to obtain concentrated slurry; and mixing a water-based paint resin emulsion, a wetting agent, a defoaming agent and a coalescing agent, adding the concentrated slurry, stirring for a preset time, adding a curing agent, and continuously stirring to obtain the daytime radiation refrigeration paint. After the prepared daytime radiation refrigeration coating forms a coating, the sunlight reflectivity of the coating is larger than 90%, and the infrared emissivity of the coating in an atmospheric window interval of 8-13 microns is larger than 90%.

A multilayer roofing material includes a first layer, a second layer, a third layer, and a fourth layer. The first layer is a topmost layer and a color layer. The first layer comprises a UV stabilizer. The second layer comprises TPO. The second layer is a white layer. The third layer comprises a scrim. The third layer contacts the second layer and the second layer is between the first layer and third layer. The fourth layer comprises TPO. The fourth layer is a core layer. The fourth layer contacts the third layer.

To provide an exterior laminate that can be used as an exterior component and is capable of sufficiently suppressing heat accumulation due to radiant heat such as sunlight. [Solution] An exterior laminate 10 is disclosed, having, in order from the surface side, a) a transparent film layer 1 containing an acrylic resin and b) a colored film layer 3 containing a polyvinyl chloride resin, wherein the colored film layer 3 of b) contains 1% by mass or more of titanium oxide particles relative to the total mass of the layer, and the solar reflectance of the colored film layer 3 of b) is 30% or more. The exterior laminate may have, in order from the surface side, a) a transparent film layer 1 containing an acrylic resin, c) a printed layer 2, and b) a colored film layer 3 containing a polyvinyl chloride resin. Preferably, the printed layer 2 of c) does not contain carbon black.

The invention relates to the field of membrane materials, and discloses a non-electric refrigeration coiled material and a preparation process thereof, and the non-electric refrigeration coiled material sequentially comprises an anti-ultraviolet layer, an intermediate infrared radiation layer, a porous reflection layer, a secondary reflection layer, a back adhesive layer and a release layer. When the non-electric refrigeration coiled material is prepared, the porous reflecting layer is subjected to hot-melt extrusion and stretched into film thickness, one side of the porous reflecting layer is sequentially coated with the intermediate infrared radiation layer and the ultraviolet layer, the other side of the porous reflecting layer is sequentially coated with the secondary reflecting layer, the back adhesive layer and the release layer, and the non-electric refrigeration coiled material is obtained after drying. The non-electric refrigeration coiled material prepared by the invention has a high reflection ratio to sunlight, obviously reflects the sunlight and reduces the indoor temperature; the radiation rate in the middle infrared band is high, indoor heat can be dissipated to the outer space in a radiation mode, the urban heat island effect is weakened, and meanwhile the service life is long. The problems that an existing cooling material is low in sunlight reflectivity, low in mid-infrared radiance and short in service life are solved, and the cooling material can be widely applied to building surfaces.

The application discloses a preparation method of multifunctional leather-based wearable material based on dynamic heat conversion, specifically comprising the following steps: preparing a radiative cooling layer on the grain side of leather; mixing poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) solution, multi-walled carbon nanotube powder, trimethoxy(1H,1H,2H,2H-hexadecafluorodecyl)silane and PDMS, adding ethyl acetate, stirring, then ultrasonic stirring, spraying on the flesh side of the leather, and drying, so multifunctional leather-based wearable material is prepared.The multifunctional leather-based wearable material prepared by the application has excellent asymmetric wettability, flame retardancy, electrical conductivity, joule heating, electromagnetic shielding, physiological signal monitoring and switchable thermal management performance.The radiative cooling layer has a solar reflectance of about 90.13% and a mid-infrared emissivity of about 87.6%, and the heating layer has a solar absorptivity of about 89%.

The invention provides a preparation method of a polymer-based radiation refrigeration material with a porous particle nested structure, and belongs to the technical field of radiation cooling energy-saving structural materials. The preparation method comprises the following steps: preparing a pre-emulsion from the polymer matrix, the diluent and the emulsifier; the polymer matrix is water-insoluble polymer polydimethylsiloxane and the like; preparing dispersion liquid from nano particles and water; adding the dispersion liquid into the pre-emulsion, and violently stirring to obtain a water-in-oil emulsion; and obtaining the polymer-based radiation refrigeration material by an emulsion template method. The internal structure of the material is composed of three photon scattering interfaces with refractive index gradients, including air / polymers, nanoparticles / polymers and air / nanoparticles, and the solar reflectivity greater than 93.0% and the atmospheric window emissivity greater than 96.0% are achieved. According to the material, the temperature is reduced by 5.0 DEG C at the lowest environment temperature in the daytime, and the maximum radiation cooling power can reach 61.0 W / m < 2 >; the temperature is reduced by 16.0 DEG C at night compared with the lowest environment temperature, and the maximum radiation cooling power can reach 105.5 / W m < 2 >.

Thermal control coatings are shown and described herein. The thermal control coating is provided from a two component addition cure silicone composition. The composition includes a curable siloxane and titanium dioxide. The compositions are fast curing compositions that exhibit low solar absorptivity, high solar reflectance, and / or high infrared emissivity when cured. In addition, the composition exhibits good flexibility when cured, and can be applied to a surface without the aid of a primer.

To provide an exterior laminate that can be used as an exterior component and is capable of sufficiently suppressing heat accumulation due to radiant heat such as sunlight. [Solution] An exterior laminate 10 is disclosed, having, in order from the surface side, a) a transparent film layer 1 containing an acrylic resin, b) a colored film layer 3 containing a polyvinyl chloride resin, and d) a base material 4, wherein the solar transmittance of b) the colored film layer 3 is 20% or more, and the solar reflectance of d) the base material 4 is 40% or more. The exterior laminate 10 may have, in order from the surface side, a) a transparent film layer 1 containing an acrylic resin, c) a printed layer 2, b) a colored film layer 3 containing a polyvinyl chloride resin, and d) a base material 4. It is preferable that c) the printed layer 2 does not contain carbon black.

The application discloses a multilayer phase change all-year energy-saving material and a preparation method thereof. The material comprises, from inside to outside, a carbonized substrate layer, a radiation energy collecting layer and a phase change radiation switch layer. The carbonized substrate layer is made of carbonized material slurry. The raw materials of the phase change radiation switch layer comprise modified nano vanadium dioxide 0.5-25 parts, a polymer substrate 20-60 parts, acetone 130-200 parts and zirconium dioxide 0.2-15 parts in terms of mass fraction. In the multilayer phase change all-year energy-saving material, the phase change radiation switch realizes the switch change of transmission and reflection at different temperatures through the spectrum change of the phase change material. The material has good radiation refrigeration function in summer, has solar reflectivity of more than 90% and atmospheric window emissivity, has solar transmittance of more than 70% in winter, absorbs solar heat through the radiation energy collecting layer to realize building heat absorption, and realizes all-year energy saving.

The invention belongs to the technical field of polymer composite materials, and relates to aerogel for radiation refrigeration, which takes biomass cellulose as a framework and is loaded with a functional layer formed by SiO2 sol derived from wollastonite and calcium phytate. Wherein the SiO2 microspheres form a radiation refrigeration layer, so that the material is endowed with high solar reflectivity (greater than or equal to 95.1%) and high infrared emissivity (greater than or equal to 91.2%); calcium phytate formed by coordination of phytic acid and calcium ions in wollastonite forms a flame-retardant layer, so that the material has rapid self-extinguishing capability. The preparation method comprises the following steps: carrying out acid treatment on wollastonite, and preparing silica sol by a sol-gel method; the radiation refrigeration layer is constructed by loading the radiation refrigeration layer on the cellulose aerogel; and then treatment is carried out through a phytic acid solution, so that calcium resource fixation and flame-retardant layer construction are synchronously realized. All-element high-value utilization of silicon and calcium components of wollastonite is achieved, the problem of waste liquid in a traditional process is solved, and the obtained aerogel integrates efficient radiation refrigeration, active flame retardance, greenness and low cost and has wide application prospects in the field of building energy conservation.

This invention relates to the field of coatings, and more particularly to a heat-insulating, waterproof coating and its preparation method. Specifically, it comprises an acrylic copolymer emulsion, a wetting agent, a dispersant, a defoamer, a thickener, a film-forming agent, a filler, and water; wherein the filler consists of mica powder and modified hollow glass microspheres. When 800-mesh mica powder and modified hollow glass microspheres are used in combination in this invention, good mechanical properties and weather resistance are maintained while ensuring good solar reflectivity. Furthermore, the addition of mica powder and modified hollow glass microspheres further enhances the waterproof performance of the coating.

The invention provides a thermal radiation refrigeration photon fiber fabric, a preparation method thereof and a wet spinning device, and belongs to the technical field of functional textile materials and radiation refrigeration. The method comprises the following steps: mixing two or more polymers which have obvious difference in dissolution behavior and viscosity in a solvent to form a spinning solution of which one phase is fully dissolved and the other phase is not completely dissolved; through a high-shear spinning device with a convergence-divergence microstructure runner and a multi-stage conical spinning assembly, a spinning stock solution is subjected to a high-shear effect in the extrusion process, remarkable velocity gradient and shear stress are generated between two phases with large viscosity difference, and a low-viscosity and incompletely-dissolved polymer phase is fibrillated and oriented; the fully dissolved polymer phase is rapidly solidified after entering a coagulating bath, a photon scattering cavity which spreads all over the fiber matrix is formed due to a phase separation effect, and finally the photon fiber with a multi-stage scattering cavity and directional microfiber synergistic structure is prepared. According to the structure, no micro-nano functional filler needs to be added, the solar reflectivity as high as 95.6% and the mid-infrared emissivity as high as 96.1% can be achieved at the same time, and an outdoor test shows that the temperature under coverage is reduced by 11.8 DEG C compared with that of a cotton fabric.

The invention provides a radiation refrigeration coating based on reactive polyurethane and a preparation method thereof. The radiation refrigeration coating based on reactive polyurethane is prepared from the following components in percentage by weight: 10 to 30 percent of silicon dioxide filler, 30 to 60 percent of macromolecular polyol, 20 to 40 percent of isocyanate, 1 to 10 percent of chain extender and 0.1 to 0.5 percent of catalyst, wherein the silicon dioxide filler is composed of at least two kinds of hollow silicon dioxide with different particle sizes. Through the gradation effect of the multi-particle-size filler, the technical problems of high viscosity and poor dispersity of a system under high filler filling are solved, the coating has high sunlight reflectivity, high infrared emissivity and excellent processing performance, the cooling effect obviously lower than the environment temperature can be achieved in the natural environment, the process is simple, and the coating is suitable for large-scale production.

The invention belongs to the technical field of radiation refrigeration materials, and discloses a waste glass / alpha-Al2O3 composite radiation refrigeration material and a preparation method thereof, and the material is composed of 40-60 wt% of waste glass powder, 40-60 wt% of alpha-Al2O3 powder and 1-10 wt% of a sintering aid. The components of the waste glass powder need to meet the following requirements: 65 to 75 weight percent of SiO2, 13 to 17 weight percent of Na2O / K2O, 6.9 to 9.0 weight percent of CaO, 1.0 to 5.0 weight percent of MgO, 1.0 to 3.5 weight percent of Al2O3, less than or equal to 0.3 weight percent of Fe2O3 and less than or equal to 2.0 weight percent of total impurities. The sintering aid is selected from low-melting-point oxides such as P2O5 and B2O3. The preparation method comprises the following steps: respectively carrying out ball milling on the waste glass and alpha-Al2O3 to D50lt; 10 [mu] m and lt; and after being mixed with an auxiliary agent to form slurry, the slurry is coated on a base material, and the base material is sintered and molded at a low temperature of 500-600 DEG C. The solar reflectivity of the material is greater than or equal to 92% (0.3-2.5 [mu] m), the atmospheric window emissivity is greater than or equal to 94% (8-13 [mu] m), and the performance of the material is attenuated by 1t after the material is subjected to ultraviolet aging for 1000 hours; 5%. According to the invention, the waste glass is used as a low-cost binding phase and an infrared emission reinforcing phase, so that the coating has excellent weather resistance, environmental benefits and process compatibility, and is suitable for building tiles and metal roof coatings.