Calcium carbonate (CaCO₃) is the most commonly used inorganic filler in polymer materials to improve the mechanical properties and reduce the costs. However, there are few reports on the preparation of cooling materials using CaCO₃. In this study, CaCO₃ was introduced into the polymer matrix as a solar reflective filler to prepare passive cooling materials. Specifically, the influences of CaCO₃ content on the structure and performances of polyvinyl chloride (PVC)/CaCO₃ composite films were characterized by scanning electron microscope (SEM), contact angle test, surface roughness and glossiness, solar reflectivity, thermal emissivity, temperature test and mechanical property characterization. When the volume fraction of CaCO₃ reaches 67%, the total solar reflectance of PVC/CaCO₃ composite films is 80.8%, which is 351.4% higher than that of PVC films. CaCO₃ powder has little influence on the thermal emissivity of the atmospheric window (3‐5 μm and 8‐13 μm) of the composite films, which remains at a high level about 0.86. In temperature test, the final temperature of sample 67 v% is only 26.8°C, which is only 2.8°C higher than the room temperature and 22.2°C lower than that of PVC films. For comparison, the cooling performance of PVC/titanium dioxide (TiO₂) composite films with 10 v% TiO₂ was also measured, and the final temperature is 29.1°C, even 2.3°C higher than that of PVC/CaCO₃ composite films with 67 v% CaCO₃. In this study, the cost‐effective and solar‐reflective PVC/CaCO₃ composites have potential application in cooling material field.

中文翻译：

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CaCO3作为高日光反射填料的新成员对聚合物复合材料的冷却性能

碳酸钙（CaCO ₃）是聚合物材料中最常用的无机填料，可改善机械性能并降低成本。然而，关于使用CaCO ₃制备冷却材料的报道很少。在这项研究中，将CaCO ₃作为太阳能反射填料引入到聚合物基体中，以制备被动冷却材料。具体而言，CaCO ₃含量对聚氯乙烯（PVC）/ CaCO ₃的结构和性能的影响通过扫描电子显微镜（SEM），接触角测试，表面粗糙度和光泽度，太阳反射率，热发射率，温度测试和力学性能表征对复合膜进行了表征。当CaCO ₃的体积分数达到67％时，PVC / CaCO ₃复合膜的总太阳反射率为80.8％，比PVC膜高351.4％。碳酸钙₃粉末对复合膜的大气窗口（3–5μm和8–13μm）的热发射率影响很小，其保持在0.86左右的高水平。在温度测试中，样品67 v％的最终温度仅为26.8°C，仅比室温高2.8°C，比PVC膜低22.2°C。为了比较，还测量了具有10 v％TiO ₂的PVC /二氧化钛（TiO ₂）复合膜的冷却性能，最终温度为29.1°C，甚至比PVC / CaCO ₃复合膜高2.3°C。含67 v％的CaCO ₃。在这项研究中，具有成本效益的太阳能反射PVC / CaCO ₃复合材料在冷却材料领域具有潜在的应用。