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1、TheUseofAERODISP®FumedSilicaDispersionstoenhanceWaterborneCoatingsDispersionstoEnhanceWaterborneCoatingsTechnicalInformationTI1371TableofContentsPage1Introduction32AERODISP®FinelyDispersedAggregates33AERODISP®–PhysicalandChemicalAttributes44PRIMARYATTRIB
2、UTES–Anti-settling45PRIMARYATTRIBUTES–ImprovedFilmFormation66SecondaryAttributes87FundamentalsforUseofAERODISP®821IntroductionFigure1showstheparticlesizeanalysisoftheAERODISP®W7520(20%solidsdispersionofAEROSIL®200)vs.Fumedsilica,invariousgradesandmodific
3、ations,hasAEROSIL®200dispersedviasonicationinwateratvary-beenusedfordecadesinthefieldofcoatingsasthixo-ingtimeintervals.tropes,anti-settlingandanti-sagagents.However,water,becauseofitslowviscosityandhighdielectricAsFigure1shows,evenafter90secondsofsonica
4、-constant,hasprovedtobeapoorgrindingmediumfortionthelevelofde-aggregationthatisachievedinthefumedsilica,makingitdifficulttoachievethedegreeAERODISP®W7520isnotpossiblewithstandardofde-aggregationanddispersionofparticlesneededAEROSIL®200inpowderform.Inmost
5、cases,whentoachieveoptimumbenefitsinwaterbornecoatings.attemptingtodispersepowderedfumedsilica,abi-modalWithoutproperdispersion,efficacyiscompromiseddistributionisproducedwithapeakoffineaggregates,andsurfaceappearancepropertiessuffer.Bothoftheseandasecon
6、dpeakofmuchlargerparticles(comprisingconcernscanbeovercomebyemployingpre-madeaggregatesandagglomerates).Theselargerparticlesdispersionsinwateroffumedsilica.EvonikIndustriesnegativelyaffectgloss,haze,andfilmclarityascanbeoffersawidevarietyoffumedsilica,al
7、uminaandtita-seeninFigure2.niadispersionsintheirAERODISP®lineofproducts.Figure2showsAEROSIL®200addedtotheacrylicLabevaluationshavedemonstratedthatmultipleper-resinRhoplex®AC337Nandmixedwithahighspeedformanceattributescanbeenhancedbytheuseofdisperserat400
8、0rpmfor15min,vs.theAERODISP®AERODISP®fumedsilicadispersionssuchas,improve-W7520atequalsilicaloading,mixedinviahandstirringmentofpigment,fillerandmattingagentsuspen-withlabspatula.sion,reducedtack,improveddirtpick-upresista
