Basf-Test-methods-for-colorants-for-coating

TechnicalInformationEVP000106e,October2006supersedesEVP000106e,May2006Page1of31®=registeredtrademarkofBASFAktiengesellschaft,unlessotherwiseindicatedTestmethodsforcolorantsforcoatingsThisTechnicalInformationbulletincontainsacollectionofbriefdescriptionsofthetestmethodsweusetodeterminetheproper-tiesofourcolorantsforcoatings.Thepurposeisnotsomuchtogivedetailedproceduresastoindicatetheunderlyingprinciples.TechnicalInformationbulletinsonourproductsrefertosomeofthetestmethodsdescribedhere.Generally,thesearemethodstodeterminethephysicalpropertiesofthecolorantsassuppliedandapplicationdatatoassesshowthecolorantsperformincoatings(fastnessproperties).Notincludedareapplication-specifictestprocedures.Theseare,whennecessary,givenintherelevantTechnicalInformationbulletinsontheproducts.StandardssuchasDIN,ENorISO,whichdescribethetestmethodsinmoredetail,arereferredtowheneverpossible.Thetestmethodspresentedbelowgiveageneralcharacterizationofourcolorantsandarevalidatthetimeofgoingtopress.Occa-sionally,amendmentsmaybenecessary.EVP000106e,October2006Page2of31TestmethodsforcolorantsforcoatingcompoundsPhysicalandfastnesspropertiesofcolorantsToevaluatethefastnessproperties,weusethecommonassess-mentcriteriaaccordingtoDINENISO105-A02(grayscalefortheevaluationofchangeinshade)andDINENISO105-A03(grayscalefortheevaluationofbleeding)respectively,usingtheseratings:ratingfastnesschangeinshadeorbleeding1poorstrong2moderatepronounced3fairlygoodsomewhat4goodatrace5verygoodnoneBulkvolumeThebulkvolumegivesanindicationofthespacerequirementsduringshipmentandstorage;ithasnoapplication-technologicalsignificance.Theaveragevaluesquotedinlitersperkilogramapplytotheproductsatthetimeoffilling.DensityThedensity–required,forinstance,todeterminethepigmentvolumeconcentration–is,unlikethebulkvolume,apropertyofthepigmentparticles.ItisdeterminedinapyknometerfollowingDIN787-10.SpecificsurfaceThespecificsurfaceisdeterminedbymeasuringthenitrogenab-sorptionusinganareameterandfollowingtheHaulandDümbgenmethod(DIN66132).Fastnesstosolvents(BASFtestmethod11.4.5.5)Thefastnesstosolventsprovidesanindicationofthepigments’bakingbehaviorandfastnesstoovercoating,hintingatthefast-nesstosolventsofthefinalcoatings.However,sincethepigments’particlesinthecoatingaresur-roundedbythebinderandthuslessexposedtosolventattack,amoderatefastnesstosolventsofthepigmentpowderdoesnotnecessarilyimplyacorrespondinglypoorfastnesstosolventsofthecoating.Thesolventsemployedarewater,ethanol,butylacetate,methyl-ethylketone,xylene,whitespiritandSolvenon®PM1.Afilterpaperbagcontaining0.5gofpigmentisimmersedin20mlofsolventfor24hoursatroomtemperature.Thefilterbagisremoved,thesolventfilteredorcentrifugedanditscolorisassessedonthegrayscaleaccordingtoDINENISO105-A02.1methoxy-1,2-propanolEVP000106e,October2006Page3of31TestmethodsforcolorantsforcoatingcompoundsConductivity(BASFtestmethod11.4.5.2)determinedfollowingDIN787-14determinedfollowingDIN787-94.0gpigment6.0mldenaturedethanol39.0ml0.1%KClARsolutioninbidistilledwaterpHvalue(BASFtestmethod11.4.5.1)Shakefor1minute,allowtostandfor5minutesandmeasurethepHtoa0.1unitaccuracy.Drycontent(BASFtestmethod11.4.5.3)determinedfollowingDIN787-2SieveresidueFollowingDIN53196,slurryaweighedamountofpigmentinwhitespirit,pourintoa40-µmmeshsieveandrinsewithfreshwhitespirituntilnomoreparticlespassthroughthesieve.Allowtheresiduetoflashoffanddrythesieveinadryingoven.Thesieveresidueconsistsofpigmentaggregates,pigmentag-glomeratesand/orcoarseimpurities.Evaluation:Thequotientofsieveresidueandinitialpigmentweightismultipliedby100togivethesieveresidueinpercent.EVP000106e,October2006Page4of31TestmethodsforcolorantsforcoatingcompoundsColoristictestingoforganicpigmentscoloredfinish:Ina370-mlglassbottle,disperse5.0gpigment95.0gbakingfinish(alkyd/melaminesystemwith35%solids)150.0gglassbeads(3mmØ)Testinginabakingfinish(EPL)Heliogen®Paliogen®Paliotol®Lithol®(BASFtestmethod11.4.1.1)onalaboratoryshakerfor60minutes.Otherratiosofpigmentandbakingfinishordispersingtimesmaybeusedforspecificpigments.Preparethewhitereductionbyhomogeneouslymixingthecoloredfinishwithawhitefinish(alsoalkyd/melaminesystem)containing40%titaniumdioxide.Thecoloredtowhitefinishratioischosensothatastandarddepthofshadeof1/3isobtained.Witha150-µmspiralapplicator,thecoloredandwhitefinishesaredrawndownunthinnedonablack-and-whitemetalpanelorablack-and-whitecontrastcard,flashedofffor20minutesandbakedat130°C(266°F)for30minutes.coloredfinish:Ina370-mlglassbottle,disperse5.0gpigment95.0gair-dryingfinish(medium-oilalkydresinwithapprox.50%solids)150.0gglassbeads(3mmØ)Testinginanair-dryingfinishSico®(BASFtestmethod11.4.1.2)onalaboratoryshakerfor60minutes.Otherratiosofpigmentandair-dryingfinishordispersingtimesmaybeusedforspecificpigments.Preparethewhitereductionbyhomogeneouslymixingthecoloredfinishwithawhitefinishcontaining40%titaniumdioxide.Thecol-oredtowhitefinishratioischosensothatastandarddepthofshadeof1/9isobtained.Witha150-µmspiralapplicator,thecoloredandwhitefinishesaredrawndownunthinnedonablack-and-whitemetalpanelorablack-andwhitec