Designation:D1469–00StandardTestMethodforTotalRosinAcidsContentofCoatingVehicles1ThisstandardisissuedunderthefixeddesignationD1469;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftherosinacidscontentofrosin,unmodifiedbysuchmaterialsasmaleicorfumaricacid,orphenols.Rosinacidsdeterminedbythistestmethodincludefreerosin.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SummaryofTestMethod2.1Therosinacidscontentoftalloilrosinandrelatedproductsisdeterminedfromatitrationoftheresidualacidityofaspecimenafterfirstselectivelyesterifyinganyfattyacids,whichmaybepresent.2.2Thespecimenisrefluxedinasolutionofcyclohexaneandbutylsulfuricacid,withcontinuousremovalofthewaterofesterification.Theresidualacidity,whichconsistsoftherosinacidsandthebutylsulfuricacidcatalyst,isthentitrated;areagentblankistreatedinthesamemannerandtitratedtodetermnetheamountofacidcatalyst.Thepercentrosinacidsiscalculatedasthedifferencebetweenthetwotitrations2.2.3Thistestmethodisapplicableovertheentirerangeofrosinacids-fattyacidsconcentrations.3.Apparatus3.1AirCondenser,760mm(30in.),witha24/40standard-taperjoint.3.2Buret,self-zeroing,ClassA,havingacapacityof25mL,forthestandardpotassiumhydroxidesolution,fittedwithsoda-limetrapstoprotectagainstabsorptionofatmosphericcarbondioxide(CO2).3.3ErlenmeyerFlasks,250-mLcapacity,with24/40groundjoint.3.4MoistureCollectionTrap,Bidwell-Sterling,5–mLca-pacity,with24/40joints.Wrapwithinsulatingtape.3.5DispensingPipet,50-mLcapacity...
