溶剂型与水性聚氨酯面漆室内加速试验和现场试验性能对比研究

Comparative Study on the Performance of Solvent-Based and Waterborne Polyurethane Top-Coats in Laboratory Accelerated Test and Field Test

以溶剂型丙烯酸聚氨酯面漆与水性脂肪族聚氨酯面漆为研究对象,在涂覆底漆和中间漆配套情况下,探讨2种室内加速老化方法(中性盐雾、氙灯老化)和自然环境曝晒(海南岛)对2种面漆老化失效的影响。试验通过面漆的宏观/微观形貌变化和失光率,来研究涂层的耐盐雾性能。通过电化学阻抗谱和红外吸收光谱对比分析2种涂层在氙灯老化和自然环境老化前后的防腐性能的差异和耐老化性能。结果表明,在各加速失效试验下,水性聚氨酯涂层具有更好的耐盐雾性能;而溶剂型丙烯酸聚氨酯面漆在老化试验后的防腐性能更好,且具有更好的耐老化性能。

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.