Spectral selectivity of black and green painted surfaces

Black, green and mixed paints were prepared from organically modified siloxane resin. The solar absorptance (as) of prepared black paint/metal coatings was 0.90 with corresponding thermal emittance (eT) 0.20, whereas green paint coatings did not reach satisfactory solar absorptance (as<0.8O). To improve the absorptance of the green coating, the black paint was admixed into the green paint. Optical properties of the prepared coatings were determined by the help of Kubelka–Munk formalism.