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首页> 外文期刊>Journal of Applied Polymer Science >Comparisons of Weathering Performance of Two Automotive Refinish Coatings: A Case Study
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Comparisons of Weathering Performance of Two Automotive Refinish Coatings: A Case Study

机译：两种汽车修补漆的耐候性能比较：一个案例研究

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摘要

The aim of this study was to compare the weathering performance of two commonly refinish coatings used in a domestic car manufacturer based on polyurethane (PU) and acid-catalyzed alkyd-melamine resins. The replacement of the alkyd-melamine refinish with the PU system was shown to largely lower the reported fading behavior of the monocoat system. For better comparison between the refinish coatings, an original equipment manufacturers' (OEM) topcoat, Cured at production line, was also used. Different characterization methods including DSC, atomic force microscopy, thermo gravimetric analysis, DMTA, and Fourier transform infrared spectroscopy were performed to elucidate the changes observed in the optical, mechanical, and weathering performance Of studied coatings. It was found that the main reason for the inferior behavior of the acid-catalyzed coatings compared with that of the PU and OEM was due to its low crosslinking density. The poor weathering resistance of the former coatings was attributed to its incomplete curing reaction and therefore, to its immatured film formation. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2946-2956, 2009
机译：这项研究的目的是比较两种基于聚氨酯（PU）和酸催化的醇酸三聚氰胺树脂的家用汽车制造商常用的修补漆的耐候性。结果表明，用PU体系代替醇酸三聚氰胺修补漆可大大降低单涂层体系的褪色性能。为了更好地比较修补涂料之间的关系，还使用了原始设备制造商（OEM）在生产线上固化的面漆。进行了包括DSC，原子力显微镜，热重分析，DMTA和傅里叶变换红外光谱在内的不同表征方法，以阐明所研究涂层在光学，机械和耐候性能方面的变化。发现与PU和OEM相比，酸催化涂层的性能差的主要原因是由于其低的交联密度。前一种涂料的耐候性差归因于其固化反应不完全，因此其成膜不牢固。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2946-2956，2009

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