Radiation-Cooling Powder Coatings: Principle, Production and Energy-Saving Benefits

Under the background of global dual-carbon goals and building energy-saving transformation, passive energy-saving materials have become a key research and development direction in the coating industry. Traditional thermal insulation powder coatings only rely on physical barrier to isolate external heat, which can slow down heat transfer but cannot actively reduce surface temperature, resulting in limited energy-saving effects. Radiation cooling powder coating is a revolutionary new type of green energy-saving coating, which breaks through the limitation of passive thermal insulation and realizes active zero-energy cooling through atmospheric infrared radiation technology.

The working principle of radiation cooling powder is based on the atmospheric transparent window theory. The coating has two core super performances: high solar reflectivity and high infrared emissivity. In the daytime, the high-reflection pigment inside the coating can reflect more than 90% of ultraviolet, visible light and near-infrared heat radiation in sunlight, preventing heat accumulation on the surface of buildings and equipment. At the same time, the special infrared radiation filler can continuously radiate the residual heat of the coating surface to the outer space in the form of long-wave infrared through the atmospheric transparent window. This all-day passive cooling mode does not consume any electric energy, which can reduce the surface temperature of outdoor buildings by 5-12℃ in summer, and effectively reduce the indoor temperature by 3-8℃.

The formula of radiation cooling powder is different from conventional powder coatings. It does not rely on thick thermal insulation fillers, but takes high-purity rutile titanium dioxide, ceramic micro-powder, silicon carbide and special infrared radiation powder as the core functional components. The matching of different functional fillers directly determines the cooling efficiency and weather resistance of the coating. However, multi-component composite formulas are prone to uneven dispersion in the production process. Local aggregation of radiation fillers will lead to inconsistent heat dissipation efficiency of the coating film, and insufficient dispersion of reflective pigments will reduce solar reflectivity, resulting in unqualified cooling effect of finished products.

TYOPSUN’s complete radiation cooling powder production line solves the problem of unstable performance of mass-produced products from the source. The intelligent batching system realizes accurate proportioning of trace functional fillers with an error of less than 0.1%. The layered high-speed mixing technology ensures uniform mixing of high-reflection pigments and infrared radiation materials. The low-temperature constant-speed twin-screw extrusion process avoids thermal inactivation of functional fillers and ensures the stability of molecular structure. After precise milling and classification, the finished powder has excellent spraying fluidity and film-forming performance, and the cooling effect of each batch is consistent and stable.

At present, radiation cooling powder coatings have been widely promoted in new energy-saving buildings, color steel roof panels, prefabricated container houses, outdoor distribution equipment and photovoltaic supporting facilities. Long-term application data shows that buildings using radiation cooling powder can reduce air conditioning energy consumption by 15%-25% in summer, greatly reducing building carbon emissions. With the continuous improvement of national green building standards, radiation cooling energy-saving powder will become a standard supporting material for low-carbon buildings, with broad market prospects and high industrial promotion value.