In the last years, the rising temperature caused by global warming brought the research to find new efficient solutions to lower the temperature of buildings and reduce the consumption of electrical energy for air conditioning. In this work, we propose the combined use of organic and inorganic near-infrared (NIR) reflective additives in low-density polyethylene (PE) films as an accessible plastic coating with enhanced cooling features. Two ‘cool’ pigments, the inorganic Sicopal® Black (Si Black) and the organic Paliogen® Black (Pa Black), were investigated for black-tinted coatings, while TiO₂ (TI) and glass bubbles (GB) were tested for opaque white coatings. The additive's size and concentration influence the composite processing, and their ultimate optical properties were determined in terms of total solar reflectance (TSR) and cooling effect under solar radiation. TI and GB dispersed in PE showed the highest TSR, whereas the organic Pa Black confirmed its superior reflective features with respect to the traditional carbon black (CB). Moreover, a significant increase in the TSR occurred when TI or GB was added to the black pigments (12.7% and 13.6%, respectively). TSR increasing led to a cooler black-tinted PE film under solar irradiation. When using reflective pigments, a cooling effect of about 10°C was measured with respect to the traditional CB.

中文翻译：

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通过结合近红外反射添加剂增强低密度聚乙烯薄膜的冷却性能

在过去的几年里，全球变暖导致气温上升，人们开始研究寻找新的有效解决方案来降低建筑物的温度并减少空调的电能消耗。在这项工作中，我们建议在低密度聚乙烯 (PE) 薄膜中结合使用有机和无机近红外 (NIR) 反射添加剂，作为一种具有增强冷却功能的可及塑料涂层。研究了两种“酷”颜料，即无机 Sicopal® Black (Si Black) 和有机 Paliogen® Black (Pa Black) 的黑色涂料，而 TiO ₂(TI) 和玻璃泡 (GB) 测试了不透明的白色涂层。添加剂的大小和浓度会影响复合材料的加工，其最终的光学性能取决于太阳辐射下的总太阳反射率 (TSR) 和冷却效果。分散在 PE 中的 TI 和 GB 显示出最高的 TSR，而有机 Pa Black 证实了其相对于传统炭黑 (CB) 的优异反射特性。此外，当向黑色颜料中添加 TI 或 GB 时，TSR 显着增加（分别为 12.7% 和 13.6%）。TSR 增加导致在太阳照射下颜色变冷的黑色 PE 薄膜。当使用反光颜料时，相对于传统的 CB，测得的冷却效果约为 10°C。