Preparation and Application of High Near-Infrared Reflective Green Pigment for Ceramic Tile Roofs

摘要

Complex inorganic green pigments having a high near-infrared (NIR) solar reflectance were synthesized. Chromium oxide (Cr_2O_3) was used as the host component with mixtures of TiO_2, Al_2O_3, and V_2O_5 as the guest components. TiO_2, Al_2O_3, and V_2O_5 were mixed into 39 different compositions. It was found that a sample, denoted by S9, with the composition of Cr_2O_3, TiO_2, Al_2O_3, and V_2O_5 are 80, 4, 14, and 2 wt%, respectively, gives a maximum NIR solar reflectance of 82.8% compared with 69.6% of a commercially available cool pigment powder. The comparison study on the effectiveness of the synthesized pigment and a commercial pigment on ceramic glaze and sprayed on ceramic tile roofs show that the new powder has given a better result by keeping the tested room about 2℃ cooler. It can be concluded that the new formulated green pigment is a highly thermal effective as an NIR reflective roof coating.