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【英文标准名称】:StandardPracticeforRheologicalCharacterizationofArchitecturalCoatingsusingThreeRotationalBenchViscometers
【原文标准名称】:用立体台式旋转粘度计测定建筑涂料流变学性能的规程
【标准号】:ASTMD7394-2008
【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】:D01.24
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:Brookfield-typeviscometer;cone/plate-typeviscometer;high-shearviscosity;low-shearviscosity;mid-shearviscosity;paints;rheology;Stormerviscometer;viscosity
【摘要】:AsignificantfeatureofthispracticeistheabilitytoobtainasemblanceofcoatingrheologyoverabroadrangeofshearrateswiththesamebenchviscometersandtestprotocolthatpaintformulatorsandpaintQCanalystsroutinelyuse.Byusingthisprocedure,anapproximationoftheshearrheologyofacoatingispossiblewithoutusingarheometer,andperformancepredictionscanbemadebasedonthosemeasurements.Low-ShearViscosity(LSV)8212;Thedeterminationoflow-shearviscosityinthispracticecanbeusedtopredicttherelativex201C;in-canx201D;performanceofcoatingsfortheirabilitytosuspendpigmentorpreventsyneresis,orboth.TheLSVcanalsopredictrelativeperformanceforlevelingandsagresistanceafterapplicationbyroll,brushorspray.Fig.1showsthepredictivelow-shearviscosityrelationshipsforseveralcoatingsproperties.5.3Mid-ShearViscosity(MSV)8212;ThedeterminationofMSV(coatingconsistency)inthispracticeisoftenthefirstviscosityobtained.Thisviscosityreflectsthecoatingsresistancetoflowonmixing,pouring,pumping,orhandstirring.Architecturalcoatingsnearlyalwayshaveatargetspecificationformid-shearviscosity,whichisusuallyobtainedbyadjustingthelevelofthickenerinthecoating.Consequently,mid-shearviscosityisideallyaconstantforagivenseriesofcoatingsbeingtestedtoprovidemeaningfulcomparisonsoflow-shearandhigh-shearviscosity.WithviscositiesatthesameKUvalue,MSVcanalsobeusedtoobtaintherelativeMid-ShearThickenerEfficiency(MSTE)ofdifferentthickenersinthesamecoatingexpressedaslbthickener/100galwetcoatingorgthickener/Lwetcoating.5.4High-ShearViscosity(HSV)8212;High-shearviscosityinthispracticeisameasureofthecoatingsresistancetoflowonapplicationbybrushorroller,whichisoftenreferredtoasbrush-dragorrollingresistancerespectively.Thisviscosityrelatestothecoatingsabilitytoprovideone-coathiding,itseaseofapplication(brushingorrollingresistance),anditsspreadrate.Fig.2showshigh-shearviscosityrelationshippredictionsforrelativecoatingperformance.FIG.1LowShearViscosity(LSV)FIG.2HighShearViscosity(HSV)1.1Thispracticecoversapopularindustryprotocolfortherheologicalcharacterizationofwaterbornearchitecturalcoatingsusingthreecommonlyusedrotationalbenchviscometers.Eachviscometeroperatesinadifferentshearrateregimefordeterminationofcoatingviscosityatlowshearrate,midshearrate,andathighshearraterespectivelyasdefinedherein.Generalguidelinesareprovidedforpredictingsomecoatingperformancepropertiesfromtheviscositymeasurementsmade.Withappropriatecorrelationsandsubsequentmodificationoftheperformanceguidelines,thispracticehaspotentialforcharacterizationofothertypesofaqueousandnon-aqueouscoatings.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q18
【国际标准分类号】:17_060
【页数】:5P.;A4
【正文语种】:英语