光老化实验试验基础培训.ppt

2020溶剂(气态/液态)012021试剂/水解介质(气态/液态)022022pH调节剂(气态/液态)03化学作用水/湿度直接影响热化作用反应速度膨胀/收缩系数01协同作用试样温度最高温度蒸发/挥发021.3热/温度模拟并加速1水：湿度/降雨/冷凝3光：质量/昼夜循环2温度42.试验室老化技术理想特性重复性重现性独立控制各应力2.1实验室老化基准日光谱基准日光谱基准日光谱聚合物敏感波长碳弧灯紫外光氙弧灯其它光源2.2实验室模拟日光碳弧灯封闭式/紫外型碳弧灯开放式/阳光型碳弧灯碳弧灯与日光光谱01020304结论不能精确模拟自然日光；可作为筛选工具；在一些汽车标准中仍然使用。碳弧灯荧光灯光源:紫外光”UVA-340UVB-31301UVB-FS400203UVA-35104紫外灯与日光光谱结论不能精确模拟自然日光，仅包括紫外部分；可作为材料筛选工具；相关性较差；紫外光源氙弧灯TitleSlideCAUTION:Ihavetriedtobeconsistentinusingtheterm“Laboratory”Weatheringthroughoutthispresentation,because(a)theterm“artificial”weatheringmayhaveasomewhatnegativecontext,(b)theterm“accelerated”weatheringcanapplytonaturaltestmethodssuchasEmmaqua,andc)it’sthetermusedintheAtlasWeatheringGuidebook.PUNCHLINE:Nonereally,althoughIsometimesoffertheexplanationabovewhilethisslideisshowing.CAUTION:Thisisa“timed”slidewherethepicturespopuponebyone,withoutyouhavingtopushthebuttons.Allofthepictures(exceptforthelastone)weretakenwithintwoblocksoftheAtlasmanufacturingfacilityinChicago,showingjusthowmanydifferenttypesofweatheringexist.Thisincludes(fromtoplefttobottomright):delaminationoftheclearcoatonacarbumper,pipeinsulationcrackingaroundapipe,awoodfencestaining,peelingofapaintonawoodsubstrate,sealantmaterialdiscoloring,automotivepaintdelaminatingonthehoodofacar,andexudationofasealantattheVietnamWarMemorialinWashington,DC.PUNCHLINE:Graphicalrepresentationofwhytestingisneeded.Solarenergyfromthesunisvariable,basedonthetimeofday,cloudconditions,seasonalvariation,location,etc.Wehavetostandardizeitsomehow.CIEistheInternationalCommissiononLight,andthisgrouphasdefinedsolarradiationtobeinthesethreecomponentsandtheseapproximatepercentages,basedonstandardatmosphericconditions.Iusuall