ASTM D6099-13 英文版

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1、Designation:D6099−13StandardTestMethodforPolyurethaneRawMaterials:DeterminationofAcidityin1ModeratetoHighAcidityAromaticIsocyanatesThisstandardisissuedunderthefixeddesignationD6099;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecase

2、ofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*duringurethaneformation.Theacidistitratedpotentiometri-callywithmethanolicKOH,andtheaciditypres

3、entinthe1.1Thistestmethoddeterminestheacidity,expressedasisocyanatesampleiscalculatedfromthetiter.partspermillion(ppm)ofHCl,inaromaticisocyanatesamplesofgreaterthan100–ppmacidity.Thetestmethodisapplicable5.SignificanceandUsetoproductsderivedfromtoluenediisocyanateandmet

4、hylene-5.1Thistestmethodcanbeusedforresearchorforqualitybis-(4–phenylisocyanate)(seeNote1).controltocharacterizearomaticisocyanatesandprepolymersNOTE1—ThistestmethodisequivalenttoISO14898,TestMethodA.ofmoderatetohighacidity.Aciditycorrelateswithperfor-manceinsomepolyure

5、thanesystems.2.ReferencedDocuments26.Apparatus2.1ASTMStandards:D883TerminologyRelatingtoPlastics6.1250-mLBeakers.E180PracticeforDeterminingthePrecisionofASTM6.250-mLPipetorRepipet,ClassAvolumetric.MethodsforAnalysisandTestingofIndustrialandSpe-36.3100-mLPipetorRepipet,C

6、lassAvolumetric.cialtyChemicals(Withdrawn2009)E691PracticeforConductinganInterlaboratoryStudyto6.4AutomaticTitrationEquipment,capableofinflectionDeterminethePrecisionofaTestMethoddetectionandstirringthesamplewhile,titrating,suchas:2.2ISOStandards:6.4.1Commerically-avail

7、ableAutomaticTitrationISO14898Plastics—AromaticisocyanatesforuseintheApparatus,4productionofpolyurethane—Determinationofacidity6.4.2ReferenceElectrode,withsaturatedLiCl/ethanolso-3.Terminologylutioninbothchambers.6.4.3pHGlassElectrode,(seeNote2).3.1Definitions—Termsused

8、inthistestmethodareinaccordancewithTerminologyD883.NOTE2—AcombinationpHelectrodewithinternalreferencealsomaybe