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Influence of binder viscosity on the control of infrared emissivity in low emissivity coating

机译：粘合剂粘度对低发射率涂料中红外发射率控制的影响

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摘要

Low emissivity is the complex system and polymer binder is one of the most important factors that affect optical and mechanical properties of the coating. Low infrared emissivity coatings were prepared by using flake aluminum particles and three types of polymer resins as fillers and binders, respectively. The influence of polymer binder viscosity on pigment particles distribution, surface morphology and infrared emissivity of the coating was systematically investigated. The results indicate that infrared emissivity of the coating can be strongly affected by the resin viscosity at the same preparation condition, which induces different aluminum particles distribution and surface morphology of the coating. Low resin viscosity is helpful for aggregating pigments and reducing the top polymer layer thickness near the surface, thus the infrared emissivity is reduced. If the resin viscosity value is decreased by two orders of magnitude, the infrared emissivity values would be reduced as much as 0.2. Additionally, a theoretical model is proposed to account for this mechanism, which indicates that sedimentation, evaporation and diffusion play important roles in forming different aluminum particles distribution during the drying process of the coating.
机译：低发射率是复杂的系统，聚合物粘合剂是影响涂层光学和机械性能的最重要因素之一。通过使用片状铝颗粒和三种类型的聚合物树脂分别作为填充剂和粘合剂来制备低红外发射率涂料。系统地研究了聚合物粘合剂粘度对涂料中颜料颗粒分布，表面形貌和红外发射率的影响。结果表明，在相同的制备条件下，涂料的红外发射率会受到树脂粘度的强烈影响，从而导致涂料中铝颗粒的分布和表面形态不同。低的树脂粘度有助于聚集颜料并减小表面附近的顶部聚合物层的厚度，因此降低了红外发射率。如果树脂粘度值降低两个数量级，则红外发射率值将降低多达0.2。此外，提出了一个理论模型来解释这种机理，这表明在涂层的干燥过程中，沉积，蒸发和扩散在形成不同的铝颗粒分布中起着重要的作用。

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