用UVB紫外辐照结合冷凝的人工加速方法对丙烯酸聚氨酯清漆进行老化试验。采用电化学交流阻抗（EIS）技术、傅立叶变换红外光谱（FTIR）及其它物理性能表征研究UV加速实验对涂层老化及防护性能的影响。结果表明，随暴露时间的增加，涂层的附着力下降，失光率和黄色指数上升，一定频率下的低频阻抗模值下降，表现为时间的变化函数。FTIR分析表明，老化试验12 d后附着力或阻抗模值的升高，可能与断链分子的重新组合有关。低频阻抗模值随暴露时间而变化，并与其它物理、化学性能的变化表现出一定的相关性。
Acrylic polyurethane varnish coatings were exposed to artificial weathering test (UVB radiation/condensation) for different periods of time. The changes of properties and barrier protection property were monitored by adhesion tester, glossmeter, spectrophotometer, Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The results showed that the adhesion strength and low frequency impedance |Z| f at a fixed frequency from EIS spectra decreased, while gloss loss and yellow index increased with increasing aging time. FTIR results showed that the increase of adhesion strength or |Z|f at 12 days exposure may be attributed to the re-association of scission molecular segments. The low frequency impedance of intact coatings for different exposure time correlated with other physical and chemical properties.
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