Coloured Solar Reflective Coating for Energy Conservation

Abstract

This research investigated the development of reflective coating in order to enhance the solarreflectance. The influence of pigment volume concentration (PVC), types of pigment, and thickness ofcoating were examined. The results obtained showed an increase in the solar reflectance as the pigmentvolume concentration and the thickness of coating were increased. It was also found that the increasingof the pigment volume concentration and the thickness of coating did not produce any major changes inthe solar reflectance as reaching its saturation value. In the comparison with the solar reflectance ofcommercial coating, it was found that the solar reflectance of the reflective coating was higher than thatof the commercial coating, except for the red and blue pigments which do not have significant differencewhen compared with the commercial coating. The degradation of coating was also investigated by acceleratedweathering test. It was found that the reflective coating of white pigment significantly decreasedduring the early stage of exposure, whlist it has no significant change in another pigment. The degradationof coating being closely associated with the degradation of binder, the chemical reaction between additiveand UV absorber, and the reversing phenomena of UV absorber and HALs.

Keywords : Degradation of Coating / Energy Conservation / Solar Reflective / Solar ReflectanceCoating