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【英文标准名称】:StandardPracticeforPolyurethaneRawMaterials:DeterminingHydroxylNumberofPolyolsbyNearInfrared(NIR)Spectroscopy
【原文标准名称】:聚氨基甲酸乙酯原料的标准实施规范:利用近红外谱法测定多元醇中的羟基值
【标准号】:ASTMD6342-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.22
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:chemometrics;hydroxylnumber;MLR;multivariateanalysis;near-infraredanalysis;NIR;PCR.PLS;polyol;polyurethane;rawmaterial;NIR(nearinfrared)spectroscopy;PCR(principalcomponentsregression);PLS(partialleastsquares)regression;Polyols;
【摘要】:GeneralUtility:Itisnecessarytoknowthehydroxylnumberofpolyolsinordertoformulatepolyurethanesystems.Thispracticeissuitableforresearch,qualitycontrol,specificationtesting,andprocesscontrol.Limitations:FactorsaffectingtheNIRspectraoftheanalytepolyolsneedtobedeterminedbeforeacalibrationprocedureisstarted.Chemicalstructure,interferences,anynonlinearities,theeffectoftemperature,andtheinteractionoftheanalytewithothersamplecomponentssuchascatalyst,waterandotherpolyolsneedstobeunderstoodinordertoproperlyselectsamplesthatwillmodelthoseeffectswhichcannotbeadequatelycontrolled.CalibrationsaregenerallyconsideredvalidonlyforthespecificNIRinstrumentusedtogeneratethecalibration.Usingdifferentinstruments(evenwhenmadebythesamemanufacturer)forcalibrationandanalysiscanseriouslyaffecttheaccuracyandprecisionofthemeasuredhydroxylnumber.ProceduresusedfortransferringcalibrationsbetweeninstrumentsareproblematicandaretobeutilizedwithcautionfollowingtheguidelinesinSection16.Theseproceduresgenerallyrequireacompletelynewvalidationandstatisticalanalysisoferrorsonthenewinstrument.Theanalyticalresultsarestatisticallyvalidonlyfortherangeofhydroxylnumbersusedinthecalibration.Extrapolationtolowerorhigherhydroxylvaluescanincreasetheerrorsanddegradeprecision.Likewise,theanalyticalresultsareonlyvalidforthesamechemicalcompositionasusedforthecalibrationset.Asignificantchangeincompositionorcontaminantscanalsoaffecttheresults.Outlierdetection,asdiscussedinPracticesE1655,isatoolthatcanbeusedtodetectthepossibilityofproblemssuchasthosementionedabove.1.1ThisstandardcoversapracticeforthedeterminationofhydroxylnumbersofpolyolsusingNIRspectroscopy.1.2Definitions,terms,andcalibrationtechniquesaredescribed.Proceduresforselectingsamples,andcollectingandtreatingdatafordevelopingNIRcalibrationsareoutlined.Criteriaforbuilding,evaluating,andvalidatingtheNIRcalibrationmodelarealsodescribed.Finally,theprocedureforsamplehandling,datagatheringandevaluationaredescribed.1.3TheimplementationofthisstandardrequiresthattheNIRspectrometerhasbeeninstalledincompliancewiththemanufacturer''sspecifications.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoequivalentorsimilarISOstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_040_10
【页数】:9P.;A4
【正文语种】:英语