为降低夏热冬冷地区建筑降耗，以片状钴蓝为颜料，改性纳米硅溶胶/苯丙复合乳液为基料，制备了深蓝色建筑节能涂层并探究片状钴蓝的掺量对涂层性能的影响。采用X 射线衍射仪、紫外/可见光/近红外分光光度计、红外辐射率测量仪、精密色差仪和扫描电子显微镜对钴蓝和建筑节能涂层性能进行表征，自制隔热装置测量涂层隔热性能。结果表明：钴蓝的近红外平均反射率为49.64%；当钴蓝掺量为15%时，涂层近红外平均反射率最大，为21.47%，此时，涂层在8～14 μm 波段的法向发射率高达0.96，涂层试板背面平衡温度比空白石棉水泥板低7.5℃，隔热性能较好。

To reduce energy consumption of buildings, dark blue building energy saving coatings were prepared by using flake cobalt blue as pigment and modified silica sol-styrene acrylic emulsion as adhesive. The influence of the cobalt blue on the properties of the coatings were then tested and characterized by using XRD diffraction, ultraviolet/visible/near infrared spectrophotometry, infrared emissivity measurement, and precision chromatic meter techniques. A custom-made infrared lamp to simulate sunlight heating was used to analyze the properties of heat insulation. The results demonstrate that the average near infrared reflectance of cobalt blue is 49.64% and the average near infrared reflectance of the coatings is 21.47% when the content of cobalt blue is 15%. Meanwhile, the normal infrared emissivity of the coatings in the 8-14 μm wave band is as high as 0.96. The equilibrium temperature of the reverse side of the plate coating is 7.5℃ lower than that of blank asbestos cement. Thus, the effective heat resistance obtained with this coating is impressive.