建筑节能涂层光学性能影响因素研究

Optical Property Influence Factors of Building Energy Saving Coatings

目的通过研究建筑节能涂层光学性能的影响因素,从而提高建筑节能涂层的光学性能。方法改变涂层的固化温度和涂层的厚度,改变增稠剂用量来调节涂料体系的黏度,采用刷涂、刮涂和喷涂来改变涂层的表面光泽度,采用差示扫描量热仪、紫外/可见光/近红外分光光度计、红外发射率测量仪、涂层光泽度测量仪和涂层测厚仪,来研究涂料体系的固化温度、黏度、涂层表面光泽度和涂层厚度对建筑节能涂层光学性能的影响。结果固化温度、黏度、表面粗糙度和厚度对涂层8~14μm波段的红外发射率的影响均较小,但对涂层的全波段和近红外波段的反射率有一定影响。实际应用时,固化温度、增稠剂用量、制备方式和涂层厚度分别以65℃、1%、喷涂和200μm为宜。结论通过改变几种影响因素可较明显地影响建筑节能涂层的反射性能,但对建筑节能涂层的红外发射率影响不大,实际应用时应综合考虑几种影响因素来获得较满意的涂层光学性能。

The work aims to improve optical property of building energy saving coatings by studying optical property influ-ence factors of the coatings. Viscosity of paint system was adjusted by changing curing temperature, coating thickness and thickener dosage. Coating surface glossiness was changed by means of brushing painting, blade painting and spraying. Effects of curing temperature, viscosity, coating surface glossiness and coating thickness of the paint paint system on optical properties of building energy saving coatings were studied using differential scanning calormimetry （DSC）, ultraviolet/visible/near infrared spectrophotometer, infrared emissivity measurement device, coating glossiness gauge and coating thickness tester. Curing tem-perature, viscosity, coating surface glossiness and coating thickness had slight effects on infrared emissivity in 8~14μm band. Whereas, the factors had certain effects on total solar reflectance and near infrared reflectance. Optimum curing temperature, thickener dosage, preparation method and coating thickness should be 65℃, 1%, spraying and 200μm, respectively during practical application. Changing several influence factors has significant effects on reflectance properties of the building energy saving coatings, but minor effects on infrared emissivity of building energy saving coatings. All the influence factors shall be considered comprehensively to present satisfactory optical properties during practical application.