为研究环境因素对冷屋面涂料反射隔热功能的影响，进行了北京地区为期 3a的冷屋面涂料自然老化试验，定期观察样板涂层形貌变化，测试其太阳光反射比和发射率等功能性参数。试验结果表明：涂层表面受污染较为严重，是影响太阳光反射比的最主要因素。太阳光反射比总体呈下降趋势，初始反射比越高，衰减越明显。在 3a内，太阳光反射比随着季节呈现周期性变化，清洗对延缓太阳光反射比尤其是溶剂型涂层反射比的衰减有所帮助。发射率略有增加，变化不大，始终维持在一个较高的水平。
In order to research the enviromental influences on radiative reflection function of cool roof coatings，a three years field weathering test of the cool roof coatings in Beijing areawas implemented by checking the changes of coatings surface and measuring solar reflectanceand thermal emittance periodically. The results indicated a serious contamination on coatingssurface，which was the main factor reducing the solar reflectance. The higher the initial solarreflectance was，the more obvious reduction of reflectance occured. During 3 years，solar reflectance showed a periodical change along with seasons. Cleaning could delay the reductionof solar reflectance，especially for solvent based coatings. Thermal emittance increaced a littleand always maintained high values.
[1]SLEIMAN M，BAN-WEISS G，GILBERT H E，et al.Soilingof building envelope surfaces and its effect on solarreflectance—Part I：Analysis of roofing product databases[J].Solar Energy Materials and Solar Cells, 2011, 95(12):3385-3399
[2] Cool Roof Rating Council，CRRC-1，Product rating program [S].Portland：CRRC，2015.
[3]林美.热反射涂料隔热机理及耐久性研究[J].中国建筑防水, 2014, (11):31-33
[4]韩立丹，陈炳跃，陈明毅等.耐候型反射隔热涂料的制备及性能[J].电镀与涂饰, 2017, 36(10):505-509
[5]杨文颐，乔亚玲，王强强等.冷屋面节能实效研究[J].中国建材科技, 2014, (1):14-17
[6] BERDAHL P，LEVINSON R，CHEN S.Measurement of solar reflectance，thermal emittance，color，and thickness[Z]. Lawrence Berkeley National Laboratory（LBNL），2015.
[7]LEVINSON R，BERDAHL P，BERHE A，et al.Effects of soiling and cleaning on the reflectance and solar heat gain ofa light-colored roofing membrane[J].Atmospheric Environment, 2005, 39(40):7807-7824
