Improvement of Polyurethane Coating Performance by Adding Titania Nanoparticles and Investigation of its Self-cleaning Effect

In this study, nanocomposite coating was performed by incorporating nano-titania photocatalyst pigment with rutile and anatase phase in polyurethane (PU) to different loading level ( . , 0.5, 1.0 and 2.0% by weight) and also self-cleaning effect practically assessment. Dispersion of nanoparticles in PU matrix was done by using ultrasonication mixing machine, rotary mixer and finally gas removing. For providing nanocomposites with low agglomerate, shall be use dispersant accordance manufacture instruction. After addition of the appropriate amount of hardener, prepared nanocomposite coating was investigated by applying on steel and glass substrate and after 2weeks time for curing, exposing them to UV weathering and salt spray testing. The dispersion quality and surface morphology of nanocomposite coating was evaluated by using different analytical techniques. Dry film thickness (DFT) of samples was mostly in the range 90 μm. Roughness after exposing of naoncomposites on UV radiation and salt spray measurement by atomic force microscopy (AFM) topography. The results revealed that addition of 0.1 wt.% rutile phase of TiO2 nanoparticles improves the best performance of nanocomposite coatings. According the results adding nanoparticle to PU improve coating lift time and also reduce maintenance and repair costs and help to decrease environment damage.