车用高分子材料不同地区户外曝晒试验相关性研究

目的将3种高分子材料以及3种车用外饰材料分别投放在中国海南琼海和美国佛罗里达州2种典型湿热环境中进行户外曝晒试验,研究气候相似的2种地区的试验相关性。方法通过测试相同时间间隔下不同材料在2处试验场曝晒过程中的黄变程度,表征材料的老化现象。采用斯皮尔曼等级相关系数的统计方法,研究材料在2个地区相同时间节点的试验结果的相关性,并利用时间同轴的作图方法比较2个地区严酷度的差异。结果琼海与佛罗里达州2个地区在各个时间节点的相关系数接近于1,且在材料黄变方面呈现一定比例关系。结论琼海和佛罗里达州2个地区的试验结果呈现出较好的相关性,且严酷度比值约为琼海︰佛罗里达=1︰1.19。

The Correlation of Areas for Natural Weathering Exposure of Automotive Materials

The outward appearance, physical and chemical properties of automotive materials will change during the production, machining, storage and the application, which is the aging process of polymer materials. Three polymer materials and three automotive materials were exposed in two typical humid and hot environments, one is Qionghai (China) and the other is Florida (USA), for natural weathering exposure test. The yellowing degree and the aging phenomenon of the materials during the exposure were evaluated at set intervals. The Spearman''s rank correlation coefficient was used to study the correlation of the two said regions which have similar environments, and the difference in environmental severity of these two regions was compared by characterizing the aging degree of the same material in different testing grounds. The results are listed as follows, in terms of the yellowing degree of materials, these two regions have a good correlation, and the environmental severity ratio is about Qionghai:Florida=1:1.19.