Alkyd-urethane paints contg. molybdenum di:sulphide or ferric oxide - used esp. for coating solar collectors, have excellent IR absorption properties

摘要

Paint compsn. comprises a mixt. of (by wt. on total compsn.) 60-70%, esp. 6% MoS2 or Fe2O3 and 30-40%, esp. 35% of at least one alkyd-urethane. The latter is pref. comprised of 20-25% (20%) of at least one urethane and 10-15% (15%) of at least one alkyd, and is in the form of a matt colourless emulsion. The compsn. may also contain at least 20% of a diluent such as white spirit, trichloroethylene, turpentine oil, etc. The paints have excellent infra red absorption properties and are useful (esp. in layers at least 8 microns thick) for coating the front panels of solar collectors. The paints have a high performance, low cost and high heat resistance.