A flexible and superhydrophobic PTFE/PU-SiO2 complex coating with synergistic effect for enhancement of passive daytime radiative cooling

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2025-04-01 Epub Date: 2025-02-12 DOI:10.1016/j.porgcoat.2025.109145

Yanhua Su , Jianyang Shi , Shuang Wang , Haibo Wang , Zongliang Du , Jinghong Qiu , Xu Cheng

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Abstract

Passive radiative cooling (PRC) is a novel form of cooling with zero pollution and zero energy consumption, which cools objects by reflecting sunlight and radiating heat to cold outer space. In this study, PTFE as the functional filler, PU as binder, SiO₂ with high infrared emissivity as the end agent in the PU, MEK and DMF as solvents were used to prepare microporous radiative cooling films. PTFE powder enhances the films' solar rflectivity, hydrophobic properties, and UV aging resistance. Using MEK and DMF as solvents eliminates the requirement for a complicated preparation procedure, and the direct drying approach may be used to create the porous coating films. When the average solar irradiance is 860 W/m², the average temperature of the films decreases by 16.4 °C, and the average radiative cooling power reaches 130 W/m². These films also demonstrate excellent hydrophobicity with a water contact angle of 134°. Notably, they retain their cooling efficiency and hydrophobic properties after 200 h of ultraviolet exposure, show amazing environmental durability and ensuring a sustained daytime radiative cooling effect.

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一种柔性超疏水PTFE/PU-SiO2复合涂层，具有增强被动日间辐射冷却的协同效应

被动辐射冷却（PRC）是一种零污染、零能耗的新型冷却方式，它通过反射阳光和向寒冷的外层空间辐射热量来冷却物体。本研究以PTFE为功能填料，PU为粘结剂，在PU中以红外发射率高的SiO2为末端剂，以MEK和DMF为溶剂制备微孔辐射冷却膜。聚四氟乙烯粉末增强了薄膜的太阳反射率、疏水性和抗紫外线老化性能。使用MEK和DMF作为溶剂消除了对复杂制备过程的要求，并且可以使用直接干燥方法来创建多孔涂层。当平均太阳辐照度为860 W/m2时，薄膜的平均温度降低16.4℃，平均辐射冷却功率达到130 W/m2。这些膜还表现出优异的疏水性，水接触角为134°。值得注意的是，它们在紫外线照射200小时后仍保持其冷却效率和疏水性，表现出惊人的环境耐久性，并确保持续的日间辐射冷却效果。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.