Passive Radiative Cooling Paint for Thermal Management

A double-layer radiation cooling coating that enhances cooling performance through a novel reflective and protective layer combination. The coating comprises a lower reflective layer with high solar reflectivity (96%) and an upper protective layer with enhanced thermal resistance (91%) in the 8-13 μm wavelength range. The reflective layer is applied on a substrate, followed by a protective layer on top. This dual-layer design enables superior cooling performance compared to traditional coatings, particularly in environments with frequent heavy rainfall.

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Radiative cooling paint that achieves zero-energy cooling through selective reflection and emission of infrared radiation. The paint comprises a polymer binder, a hydrophobic ceramic fine particle dispersion, and air bubbles. The dispersion and bubbles are formed within the polymer binder, creating a composite material with enhanced light scattering properties. The ceramic particles and bubbles work together to maximize infrared emission while minimizing absorption, enabling the paint to reflect and radiate infrared radiation without absorbing incident solar energy.

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Double-layer radiation cooling coating for ambient temperature surfaces, comprising an outer reflective layer and a thermal insulation layer. The coating combines a hollow aluminum oxide structure with a solid silicon dioxide filler, where the outer layer features a hollow structure with nano-sized reflective particles. This unique composition enables the coating to achieve radiative cooling at ambient temperatures without energy consumption, while maintaining excellent thermal insulation properties.

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Radiation cooling coating for buildings that enhances natural cooling through enhanced surface reflection and radiation absorption. The coating incorporates tetrahedral radiation cooling fillers, nano-titanium dioxide, and hollow glass beads, which form a multi-directional reflective surface when applied to the building's surface. This unique surface structure maximizes radiation absorption and reflection of solar and ambient radiation, effectively reducing building temperature without employing traditional infrared shielding.

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Water-based radiative cooling paints that achieve passive thermal cooling through selective reflection of solar radiation while maximizing thermal emission. The paints contain a water-based binder, hydrophobing agent, and radiative cooling pigment, which are combined in a specific ratio to produce a uniform solution. The solution is then applied to surfaces or structures, where it exhibits enhanced thermal emission properties compared to conventional paints. The paints' hydrophobic surface properties prevent water penetration, while the radiative cooling pigment absorbs solar radiation and emits thermal energy.

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Heat-insulating coating composition for buildings that combines thermal insulation with radiant cooling. The composition comprises an epoxy resin with controlled curing agents, pigment with enhanced photocatalytic properties, and titanium dioxide, aluminum oxide, or aluminum flakes as fillers. The coating exhibits superior thermal insulation performance when applied as a white pigment-based coating, while also demonstrating enhanced radiant cooling capabilities when used as a colored pigment-based coating. The composition enables buildings to maintain optimal interior temperatures during peak solar radiation hours while reducing energy consumption through the coating's ability to release internal heat and reflect external solar radiation.

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Radiative cooling coatings that enhance solar reflectivity and infrared emission through bubble formation within the film layer. The coatings achieve this through controlled porosity within the film, where bubbles are created by dispersing ceramic particles in a polymer binder. The bubbles absorb and scatter solar radiation while emitting infrared energy, effectively reducing heat gain through radiation. The porosity range is optimized between 3% and 50% to balance reflectivity and infrared emission. This innovative approach enables radiative cooling without requiring thick coatings, while maintaining paint workability and surface finish.

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Heat shielding and insulating paint composition that combines superior thermal performance with excellent adhesion properties. The composition comprises an aqueous emulsion of acrylic ester-methacrylic ester-styrene copolymer, rutile-type titanium dioxide, and hollow acrylic beads, with specific mass ratios of 35-50% emulsion, 20-30% rutile, and 5-20% beads. This composition achieves optimal thermal insulation while maintaining strong adhesion to substrates.

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A thermal insulation coating with enhanced reflectivity and infrared radiation properties that combines high-reflective pigments with high-reflective fillers. The coating consists of a base film-forming resin, hollow glass beads coated with ferric oxide and titanium dioxide, and a rutile titanium dioxide nanoparticle layer. The hollow glass beads are prepared using a process that maintains their structural integrity during the coating process, while the ferric oxide and titanium dioxide layers are prepared through controlled chemical reactions. The coating achieves superior thermal insulation performance while maintaining high reflectivity and infrared radiation properties.

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Radiation refrigeration coating for passive building cooling that achieves both solar radiation reduction and infrared emission. The coating comprises a water-based base, film-forming additives, and specific reflectivity components. The coating's reflectivity profile ranges from 0.25 to 14 microns, with a maximum of 0.93 in the atmospheric window for infrared radiation. The coating's performance is achieved through a single-layer composition with specific reflectivity values optimized for solar radiation reduction and infrared emission.

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A refrigeration coating that enables passive solar cooling through enhanced thermal insulation and radiation management. The coating comprises a transparent protective layer with weather-resistant and light-resistant properties, an interface layer between the reflective layer and the radiation layer, and a radiation layer with enhanced thermal infrared absorption. The coating incorporates a specially formulated interface layer that enhances adhesion between the reflective layer and the radiation layer, while the protective layer provides durability against environmental factors. The radiation layer is prepared through a multi-step process involving preparation of a base material, nanoparticles, interface agent, and film-forming agent, with the protective layer being applied as a varnish.

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Radiative cooling paint layer that enables passive cooling through selective reflection of near-infrared radiation while absorbing visible light, achieving a cooling effect without energy consumption. The paint layer comprises a radiant cooling paint layer under a color paint layer, where the color paint layer absorbs visible light while the radiant cooling paint layer reflects near-infrared radiation. This dual-layer approach enables efficient cooling through selective absorption and reflection of radiation, particularly effective in daylight conditions. The paint layer can be formulated with nano-particles that enhance its infrared absorption properties, while maintaining high reflectivity for visible light. The paint layer can be applied on various surfaces, including metals, plastics, and glass, and can be formulated with additional protective layers for durability.

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Radiative cooling coating preparation method that enables efficient and environmentally friendly cooling through selective reflection of solar radiation while maintaining hydrophobic properties. The method involves dissolving a film-forming material in an organic solvent, heating and stirring to form a solution, followed by ultrasonic treatment to create a radiation cooling coating. This process enables the creation of coatings with enhanced radiation cooling performance while maintaining their hydrophobic surface properties.

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Radiative cooling coating with enhanced solar reflectance for buildings and outdoor structures. The coating comprises a pigment and filler system, a film-forming agent, an auxiliary agent, and water, with median particle sizes between 300nm and 2000nm. The coating achieves high solar reflectance through a specialized resin emulsion and solid resin formulation, enabling effective radiation cooling without absorbing significant amounts of solar radiation. The coating can be applied using conventional coating methods, including spraying, brushing, or painting, and is particularly suitable for building surfaces.

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Radiative cooling paint that achieves high daytime cooling through thin, lightweight formulations. The paint comprises nanoplatelets of hexagonal boron nitride (hBN) and an acrylic binder, with a wet phase binder system that enables uniform nanoplatelet distribution. The hBN nanoplatelets exhibit high solar reflectance and sky window emittance, while the acrylic binder provides structural integrity. The paint formulation enables radiative cooling without requiring thick coatings, making it suitable for applications requiring low-weight materials.

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Radiant cooling element comprising a heat-radiating powder coating and a coating film layer using a heat-radiating powder coating, specifically, by maximizing reflection of incident sunlight and minimizing absorption, minimizing absorption of near-infrared rays even when colored, does not absorb heat from incident sunlight, and at the same time has high absorption (radiance) for long-wavelength infrared rays and high thermal conductivity, so that the energy of the heat source is directed to the surface.

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Devices and methods for enhanced radiative cooling through integrated mid-infrared reflectors and radiative cooling coatings. The system employs a radiative cooling coating that exhibits high emissivity for wavelengths between 8-13 microns, while a mid-infrared reflector is strategically positioned to redirect thermal energy from the lower surfaces of the object to space. This dual-approach enables concentrated radiative cooling by leveraging both upper and lower surface areas to achieve deeper space cooling.

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Radiative cooling device that achieves ambient temperature cooling without energy consumption through selective reflection of sunlight and infrared radiation. The device comprises a paint film layer with a high refractive index in the incident sunlight region and a high refractive index in the atmospheric window region. The paint film layer is formed using radiation cooling paint that maximizes reflectivity and absorption in the 0.3-2.5 μm wavelength range while maintaining high transmittance in the 8-13 μm wavelength range. The paint film layer incorporates nanostructured particles with a refractive index of 1.6 or more and a bandgap of 5 eV or more, enabling efficient scattering and reflection of solar radiation while minimizing absorption. The device includes a primer layer and a polymer protective layer for surface modification and adhesion.

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Radiative cooling paint that enhances surface cooling through controlled thermal radiation emission. The paint comprises a porous structure formed through a pore-forming agent, which is cured to create a thermal radiation emitter. This structure is applied to surfaces and exhibits enhanced cooling properties through selective emission of thermal radiation at specific wavelengths. The paint's porous structure allows efficient heat dissipation while maintaining thermal radiation emission, making it particularly effective for cooling applications where direct heat absorption is limited.

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Radiant refrigeration paint with enhanced solar reflectivity for efficient cooling applications. The paint achieves high reflectivity through a novel composition that combines advanced metal oxides with specific surface treatments. The preparation method involves a controlled thermal treatment process to create a uniform, high-reflectivity coating. The application field includes industrial refrigeration systems, particularly in high-temperature environments where radiant cooling is critical.

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