【英文标准名称】:StandardTestMethodforMeasurementofTransitionTemperaturesofPetroleumWaxesbyDifferentialScanningCalorimetry(DSC)
【原文标准名称】:用差示扫描量热法测定石油蜡转变温度的标准试验方法
【标准号】:ASTMD4419-1990(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:1990
【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】:D02.10.0A
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:differentialscanningcalorimetry;petroleumwax;thermalproperties;transitiontemperature;Differentialscanningcalorimetry(DSC);Petroleumwax;Solidphasematerials;Temperaturetests--petroleumproducts
【摘要】:DSCinaconvenientandrapidmethodfordeterminingthetemperaturelimitswithinwhichawaxundergoesduringtransitions.Thehighesttemperaturetransitionisasolid-liquidtransitionassociatedwithcompletemelting;itcanguidethechoiceofwaxstorageandapplicationtemperatures.Thesolid-solidtemperaturetransitionisrelatedtothepropertiesofthesolid,thatis,hardnessandblockingtemperature.Note28212;Forarelativelynarrowcutpetroleumwax,thelowesttransitionwillbeasolid-solidtransition.Anarrowcutwaxisoneobtainedbydeoilingasinglepetroleumdistillatewithamaximumrangeof120x00B0;Fbetweenits5%and95%volinaccordancewithTestMethodD1160boilingpoints(convertedto760torr).TheDSCmethodcannotdifferentiatebetweensolid-liquidandsolid-solidtransitions.Suchinformationmustbepredeterminedbyothertechniques.Inthecaseofblends,thelowertemperaturetransitionmaybeenvelopesofbothsolid-liquidandsolid-solidtransitions.Sincepetroleumwaxisamixtureofhydrocarbonswithdifferentmolecularweights,itstransitionsoccuroveratemperaturerange.Thisrangeisonefactorthatinfluencesthewidth,expressedinx00B0;C,oftheDSCpeaks.Thehighesttemperaturetransitionisafirst-ordertransition.If,foraseriesofwaxes,thereissupportingevidencethatthehighesttemperaturetransitionofeachwaxisthemajorfirst-ordertransition,itsrelativewidthshouldcorrelatewiththerelativewidthofthewax''smolecularweightdistribution.1.1Thistestmethodcoversthetransitiontemperaturesofpetroleumwaxes,includingmicrocrystallinewaxes,bydifferentialscanningcalorimetry(DSC).Thesetransitionsmayoccurasasolid-solidtransitionorasasolid-liquidtransition.1.2Thenormaloperatingtemperaturerangeextendsfrom15x00B0;Cto150x00B0;C(Note1).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E42
【国际标准分类号】:75_140
【页数】:4P.;A4
【正文语种】:英语