翻译版ISO-4892-2氙弧灯老化

Plastics—Methodsofexposuretolaboratorylightsources—Part2:Xenon-arclamps塑料---实验室光照老化测试第二部分---氙弧灯1ScopeThispartofISO4892specifiesmethodsforexposingspecimenstoxenon-arclightinthepresenceofmoisturetoreproducetheweatheringeffects(temperature,humidityand/orwetting)thatoccurwhenmaterialsareexposedinactualend-useenvironmentstodaylightortodaylightfilteredthroughwindowglass.此ISO4892标准中介绍了将试样暴露在氙灯及雨淋环境中，通过模仿自然光或有窗户玻璃过滤状态下的自然环境，以确定终端客户在使用材料时受到自然气候的影响（温度，湿度/或受潮）。SpecimenpreparationandevaluationoftheresultsarecoveredinotherInternationalStandardsforspecificmaterials.特殊材料试样的制备以及结果评价参考其他国际标准。GeneralguidanceisgiveninISO4892-1.通则见ISO4892-1NOTEXenon-arcexposuresofpaintsandvarnishesaredescribedinISO11341.注：涂料及清漆的氙灯老化见ISO113412NormativereferencesThefollowingdocuments,inwholeorinpart,arenormativelyreferencedinthisdocumentandareindispensableforitsapplication.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.ISO4582,Plastics—Determinationofchangesincolourandvariationsinpropertiesafterexposuretodaylightunderglass,naturalweatheringorlaboratorylightsourcesISO4892-1,Plastics—Methodsofexposuretolaboratorylightsources—Part1:GeneralguidanceISO9370,Plastics—Instrumentaldeterminationofradiantexposureinweatheringtests—Generalguidanceandbasictestmethod3Principle3原理3.1Axenonarc,fittedwithfilters,isusedtosimulatetherelativespectralirradianceofdaylightintheultraviolet(UV)andvisibleregionsofthespectrum.3.1配置了合适的滤光器的氙弧灯，其产生的辐射类似于地面日光的紫外和可见区的光谱能量分布。3.2Specimensareexposedtovariouslevelsoflight,heat,relativehumidityandwater(see3.4)undercontrolledenvironmentalconditions.3.2将试样暴露于不同水平的光线，热度，相对湿度以及水淋等受控的环境条件下3.3Theexposureconditionsarevariedbyselectionofa)thelightfilter(s);b)theirradiancelevel;c)thetemperatureduringexposuretolight;d)therelativehumidityinthechamberduringlightanddarkexposures,whenexposureconditionsrequiringcontrolofhumidityareused;e)thewaythetestspecimensarewetted(see3.4);f)thewatertemperatureandwettingcycle;g)therelativelengthsofthelightanddarkperiods.3.3暴露的条件可有多种选择：a）滤光器b）辐射等级c）光照时的温度d）当暴露条件要求控制湿度时，测试箱在日光及无光照射时的相对湿度e）试样加湿的方式f）水浴温度计加湿循环周期g）光照及非光照的周期时长3.4Wettingisproducedbysprayingthetestspecimenswithdemineralized/deionizedwater,byimmersioninwaterorbycondensationofwatervapourontothesurfacesofthespecimens.试验片的加湿是通过喷射去矿物水/去离子水，浸入水中或在试样表面冷凝水汽来实现的。3.5TheprocedureincludesmeasurementsoftheUVirradianceandUVradiantexposureintheplaneofthespecimens.3.5程序应包含测量试验片平面上受到的UV辐射度及UV辐射曝量。3.6Itisrecommendedthatasimilarmaterialofknownperformance(acontrol)beexposedsimultaneouslywiththetestspecimenstoprovideastandardforcomparativepurposes.3.6建议同时放置一个已知性能的材料用做测试样品的比对标准。3.7Intercomparisonofresultsobtainedfromspecimensexposedindifferentapparatusshouldnotbemadeunlessanappropriatestatisticalrelationshiphasbeenestablishedbetweentheapparatusesfortheparticularmaterialexposed.3.7试样暴露于不同的装置得到的结果可相互比较，4Apparatus4.1Laboratorylightsource实验光源4.1.1GeneralThelightsourceshallcompriseoneormorequartz-jacketedxenon-arclampswhichemitradiationfrombelow270nmintheultravioletthroughthevisiblespectrumandintotheinfrared.4.1.1石英套管的氙弧灯的光谱范围包括波长大于270nm的紫外光、可见光和红外辐射Inordertosimulatedaylight,filtersshallbeusedtoremoveshort-wavelengthUVradiation(methodA,seeTable1).为了模拟直接的自然暴露，辐射光源必须过滤，以便提供与地球上的日光相似的光谱能量分布（方法A，将表1）Filterstominimizeirradianceatwavelengthsshorterthan310nmshallbeusedtosimulatedaylightthroughwindowglass(methodB,seeTable2).采用可减少波长310nm以下光谱福照度的滤光器来模拟透过窗户玻璃绿光后的日光（方法B，见表2）Inaddition,filterstoremoveinfraredradiationmaybeusedtopreventunrealisticheatingofthetestspecimens,whichcancausethermaldegradationnotexperiencedduringoutdoorexposures.总之，当加热试样对光化学反应速度有不利影响，或在自然暴露下并不会引起热老化时，可以使用附加的滤光器来减少非光化作用的红外能量。NOTESolarspectralirradianceforanumberofdifferentatmosphericconditionsisdescribedinCIEPublicationNo.85.ThebenchmarkdaylightusedinthispartofISO4892isthatdefinedinTable4inCIENo.85:1989.注：一些列不同大气环境下日光光谱福照度在CIENo.85中有进行刊登。本标准ISO4892中使用的日光基准见CIENo.85:1989表4规定。4.1.2Spectralirradianceofxenon-arclampswithdaylightfilters4.1.2经过日光滤光器的氙弧灯光谱辐照度Filtersareusedtofilterxenon-arcemissionsinordertosimulatedaylight(CIEPublicationNo.85:1989,Table4).TheminimumandmaximumlevelsoftherelativespectralirradianceintheUVwavelengthrangearegiveninTable1(seealsoAnnexA).为模仿自然光需使用滤光器来过滤氙弧光谱（CIENo.85:1898表4）。紫外光谱的最大及最小辐照水平见表1Table1—Relativespectralirradianceofxenon-arclampswithdaylightfiltersab(methodA)经滤光的氙弧灯相对光谱辐照度（方法A）aThistablegivestheirradianceinthegivenpassband,expressedasapercentageofthetotalirradiancebetween290nmand400nm.Todeterminewhetheraspecificfilterorsetoffiltersforaxenon-arclampmeetstherequirementsofthistable,thespectralirradiancemustbemeasuredfrom250nmto400nm.Thetotalirradianceineachwavelengthpassbandisthensummedanddividedbythetotalirradiancefrom290nmto400nm.Typically,thisisdonein2nmincrements.a此表给出了固定波段的辐照度，以290-400nm之间的全部辐照度百分比来表示。根据此表的要求来决定是否需要特殊的滤光器或设定来过滤氙弧光，必须测量250-400nm光谱辐照度。各个波段总的光谱辐照度求和并除以290-400nm的总光谱福照度。其典型的增量为2nm。bTheminimumandmaximumlimitsinthistablearebasedonmorethan100spectralirradiancemeasurementswithwater-andai