本发明涉及一种多级多孔辐射制冷薄膜涂 层的制备方法，以高内相油包水乳液为模板，将 有机硅烷和高分子预聚体或单体溶解在油相中， 经加热聚合形成有机无机复合骨架，干燥后，即 可得到多级多孔辐射制冷薄膜涂层。本发明无需 使用复杂昂贵的加工设备和严苛的加工条件，即 可大规模生产。本发明制备的薄膜涂层因其丰富 的多级孔结构和优异的光学固有特性，不仅可以 将波长范围在0 .3‑2 .5μm的太阳光高反射回去， 还把自身热量通过波长为8‑13μm的大气透明窗 口散逸到寒冷的外太空，即使在阳光直射下，薄 膜涂层仍可降温5℃以上。本发明作为一种新型 制冷技术，有望减少或替代传统的电冷却系统， 实现建筑物表面的自发降温，并可有效缓解全球 气候变暖的问题。 

The present invention relates to a preparation method for a multi-level, multi-porous radiant cooling thin film coating. Using a high internal phase emulsion (HIPE) as a template, organosilane and polymer prepolymers or monomers are dissolved in the oil phase. Through heating and polymerization, an organic-inorganic composite framework is formed, and after drying, a multi-level, multi-porous radiant cooling thin film coating can be obtained. The present invention enables large-scale production without the need for complex and expensive processing equipment or stringent processing conditions. The thin film coating prepared by the present invention, with its abundant multi-level pore structure and excellent optical properties, not only reflects solar radiation in the wavelength range of 0.3-2.5 μm but also dissipates its own heat through the atmospheric window with a wavelength of 8-13 μm to the cold outer space. Even under direct sunlight, the thin film coating can still reduce the temperature by more than 5℃. As a new refrigeration technology, the present invention has the potential to reduce or replace traditional electric refrigeration systems, achieve spontaneous cooling of building surfaces, and effectively alleviate global climate warming issues.