hydrophobicity achievement of polyurethane coating using nano-silica and teflon powders

The current study reports synthesis of nano-sio2/teflon powder polyurethane composite coating. results have shown adequate hydrophobicity (ca>90°) for two various samples with different nano-sio2 concentration of 9 wt.% and 11 wt.% wich were modified by thermal treatment method. propertie of prepared hydrophobic coatings were analyzed and characterized using scanning electron microscopy (sem) and contact angle measurement (ca). eventually this study proposed a simple, low-cost method of hydrophobic coatings preparation. the adequate samples have a water contact angle of 125.6° and 139.8°, respectively.