陶氏水性环氧涂料.ppt

VOC-freeWaterborneEpoxyEmulsionsandDispersionsforAmbientCureCoatings,WaterborneEpoxydispersions?,Stricterlegislationislimitingtheuseofsolvents-VolatileOrganicCompounds(VOC)inpaintse.g.Europeandirective1999/13/ECandamendment2004/42/ECfirststageimplementedin2007secondstageimplementedin2010U.S.:3majororganizationsdrivingthereductionofVOCEnvironmentalProtectionAgency(EPA,throughCleanAirAct)SouthCoastAirQualityManagementDistrict(SCAQMD)OzoneTransportationCommission(OTC)“GreenImage”environmentalfriendlycoatingsLowodor,lowflammabilityEasycleaningofequipmentwithwaterMakinguseoftheexcellentpropertiesofEpoxyresins(e.g.corrosionresistance,chemicalresistance,adhesion,)withminimalamountsofsolventtofulfilllegalandenvironmentalrequirements,Driversandalternativeapproaches,TypicalsolventborneformulationsforMarineandProtectivecoatingsarebasedonepoxyresingradeswithanEpoxyEquivalentWeightof500gr/eqcontainingsolventslikeXyleneTypicalsolventcontentofthesesolidepoxyresinsolutionsis25%MajorcontributortotheoverallVOCcontentofasolventborneformulationSeveralapproachesexisttominimizeoreliminatetheVOCcontentHighsolidscoatingsPowdercoatingsRadiationcuredcoatingsWaterbornecoatings,DowsTechnologyApproach,DowtechnologyNonionicsurfactantwasespeciallydevelopedforWBepoxyresinsSurfactantisepoxyfunctionalsothatitwillbepartofthecuredmatrixUniquedispersionprocesswhichallowsmonomodularandsubmicronparticlesizedistributionsSubmicronparticlesizedistributionsallowagoodstoragestabilityandfilmformationFormulatorcanusesolventofchoiceNoadditionalsolvent,solowVOCformulationscanbepreparedGradesEmulsionofaLiquidEpoxyResincommercialgradeDispersionofanEpoxyNovolacResincommercialgradeDispersionofaSolidEpoxyResincommercialgrade,Chemistry,Process,Properties,+,Ambientcuredcoatings,VOCfreeWBepoxydispersions,TypicalParticleSizedistributions,Particlesizedistributionofanaqueousdispersionofasolidepoxyresin,Particlesizedistributionofanaqueousdispersionofanepoxynovolacresin,StorageStability,SubmicronparticlesizedistributionsleadtoexcellentstoragestabilitiesdemonstratedwiththeexampleofaWBepoxynovolacdispersionXZ92546.00,Onlyverylightsedimentafteroneyearofstorageat23Cwhichcanbeeasilystirredin,Viscosityprofileofepoxydispersion,Solidcontentsupto54%withoutsolventscanbeachievedifhighviscositiescanbetolerated,XZ92533.00Goodshearthinningpropertiesallowinggoodflowandsprayproperties,MechanicaldispersionProcess,ProcesspatentedbyDow:ContinuousfeedofresinandwatertothemixingunitunderhighshearHighviscousresinscanbedispersedwithouttheadditionofsolventsExcellenttransferofprocessparametersfromlabtopilottomanufacturingscaleSubmicronandmonomodularparticlesizedistributions,Influenceofprocessparameters,Particlesizecanbeinfluencedbythetotalflowrate,Significantincreaseinviscositywithdecreasingparticlesizedistribution,Influenceofprocessparameters,SolidEpoxyResinDispersion,CureRate,BothCuringagentsarebasedonwatersolubleepoxyamineadducts,Dryingtimesbasedondryingtimerecorder,Potlife,As2KWBepoxysystemsdonthavenecessarilyavisibleendofpotlifeliketheirsolventbornecounterpartsotherpropertiesaretested,Some2KWBepoxysystemsbasedonDowsdispersiontechnologyshowexcellentglossretentionovertime,Anti-corrosivePrimerWhite,ComponentAWeight-%1CuringAgent213,42Demineralisedwater29,13TEGODispers750WTego-Chemie1,64BYK019/024(3:2)BYKChemie0,55OmyaBLR3Omya17,56Micro-TalcATExtraOmya9,07Micro-TalcAT1Omya8,08HeucophosZPAHeubach10,09Kronos2059Kronos10,010AerosilR972Degussa0.9TotalComponentA:100,0ComponentB1-TypeDispersion87,0,Barrierproperties,Goodbarrierpropertiesagainstsolvents,waterandbasicmaterialsTheclearcoatedsystemsshowsomeminordeficienciesagainstsomeacidsFullyformulatedsystemsbasedoncommercialavailableanticorrosionpigmentsachieve1000hoursofsaltsprayresistanceonpretreatedsteelpanelsCorrosion/saltsprayresistanceoncoldrolledsteelof1000hourscouldbeachievedwiththehelpofadhesionpromoterse.g.basedonepoxysilanechemistry,Salt-SprayTestDIN50021,Exposure1000hoursBlistering:none(m0g0)Underrusting:1mmAdhesion:GT1Scratch-Test:o.k.(K0)SubstrateColdRolledSteel,TypeR-46(Q-panel),InstitutionalCoating,Pot-lifeandDrying,DryTimes(1.5mildryfilms)Set-To-Touch0.4hrs.SurfaceDry0.6hrs.DryThrough5.0hrs.,20DegreeGlossNoInduction10130Min.1011Hr.1012Hr.923.5Hrs.784.5Hrs.65,Resistance,Cure:14daysR.T.conditionsof720Fand50-55%R.H.TestMethod:ASTMD-1308(coveredspottest,18hr.exposuretime,norecovery),CombinationEpoxy/PUDispersion,Combinationsarepossiblebutappropriatehardenerselectionisrequired(clarity)GlossofcuredmixturesisinthesamehighrangeasforthePUDaloneFlexibilityisimprovedwhenPUDisaddedtoEpoxyDispersionsCoatinghardnessfollowstheratioofEpoxytoPUDfor90%stoichiometrichardenerratio.Especiallysolventresistanceisimprovedwhenepoxydisp