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研究了丙烯酸聚氨酯清漆涂层在荧光紫外UVA辐照/凝露和氙灯辐照/雨淋两种加速实验程序下的物理、化学性能和防护屏障性与暴露时间的关系.结果表明:氙灯辐照/雨淋对涂层的膜厚损失、失光率的影响程度略大于同周期UVA加速的效果;而黄色指数及不同暴露周期的完整涂层的低频阻抗模值与暴露时间的关系则与FTIR反映的羰基指数的变化规律较为一致,显示UVA加速涂层老化的效果大于同周期氙灯加速效果.且在两种加速条件下,完整涂层的低频阻抗模值均与暴露时间呈指数规律衰减,表现出较好的时间函数关系;说明EIS的低频阻抗模值与UV光辐射产生的涂层性能的变化有一定的相关性,并很好地反映其防护屏障性,可作为有效的监测参量用于建立室内外老化实验的相关性,预测光老化涂层的防护寿命.
The relationship between the physical and chemical properties and the protective barrier and the exposure time of acrylic urethane varnish coatings under accelerated UV-Vis irradiation / condensation and xenon lamp irradiation / rain shower were studied.The results showed that the xenon lamp irradiation / Rain on the film thickness loss, the impact of the rate of light is slightly greater than the same period of accelerated UVA effect; and the yellow index and different exposure cycles complete coating low frequency impedance modulus and exposure time with the FTIR The results showed that the change of carbonyl index was consistent, indicating that the effect of UVA accelerated coating aging was greater than that of xenon lamp accelerated at the same period. Under both accelerated conditions, the low frequency impedance of intact coating decreased exponentially with exposure time, Which shows that the low frequency impedance of EIS has a certain correlation with the change of coating performance caused by UV light radiation and can well reflect the protective barrier and can be used as an effective monitoring parameter To establish the correlation between indoor and outdoor aging experiments, predict the protective life of photo-aged coatings.