Comparative Study on the Performance of Solvent-Based and Waterborne Polyurethane Top-Coats in Laboratory Accelerated Test and Field Test
Taking solvent-based acrylic polyurethane top-coat and waterborne aliphatic polyurethane top-coat as the research objects,this study explored the effects of two laboratory accelerated aging methods(neutral salt spray,xenon lamp aging)and natural environmental expo-sure(Hainan Island)on the aging failure of the two top-coats under the condition of matching the primer and intermediate coat.The salt spray resistance of the coating was assessed by observing changes in the macro/micro morphology and gloss loss rate of top-coats.Electrochemical im-pedance spectroscopy and infrared absorption spectroscopy were utilized to compare and analyze the difference of anti-corrosion and anti-aging properties of the two coatings,both before and after undergoing xenon lamp aging and natural environmental aging tests.Results showed that un-der each accelerated failure test,the waterborne polyurethane coating was found to have better salt-spray resistance.Additionally,it was observed that the solvent-based acrylic polyurethane top-coat exhibited superior anti-corrosion properties and better aging resistance after the aging test.
polyurethane top-coatneutral salt sprayaging testanti-corrosion property
万方数据
维普
