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 TypicalsolventborneformulationsforMarineandProtectivecoatingsarebasedonepoxyresingradeswithanEpoxyEquivalentWeightof 500gr eqcontainingsolventslikeXyleneTypicalsolventcontentofthesesolidepoxyresinsolutionsis25 MajorcontributortotheoverallVOCcontentofasolventborneformulationSeveralapproachesexisttominimizeoreliminatetheVOCcontentHighsolidscoatingsPowdercoatingsRadiationcuredcoatingsWaterbornecoatings Dow sTechnologyApproach DowtechnologyNonionicsurfactantwasespeciallydevelopedforWBepoxyresinsSurfactantisepoxyfunctionalsothatitwillbepartofthecuredmatrixUniquedispersionprocesswhichallowsmonomodularandsubmicronparticlesizedistributionsSubmicronparticlesizedistributionsallowagoodstoragestabilityandfilmformationFormulatorcanusesolventofchoiceNoadditionalsolvent solowVOCformulationscanbepreparedGradesEmulsionofaLiquidEpoxyResin commercialgradeDispersionofanEpoxyNovolacResin commercialgradeDispersionofaSolidEpoxyResin commercialgrade Chemistry Process Properties Ambientcuredcoatings VOCfreeWBepoxydispersions TypicalParticleSizedistributions Particlesizedistributionofanaqueousdispersionofasolidepoxyresin Particlesizedistributionofanaqueousdispersionofanepoxynovolacresin StorageStability SubmicronparticlesizedistributionsleadtoexcellentstoragestabilitiesdemonstratedwiththeexampleofaWBepoxynovolacdispersionXZ92546 00 Onlyverylightsedimentafteroneyearofstorageat23 Cwhichcanbeeasilystirredin Viscosityprofileofepoxydispersion Solidcontentsupto54 withoutsolventscanbeachievedifhighviscositiescanbetolerated XZ92533 00Goodshearthinningpropertiesallowinggoodflowandsprayproperties MechanicaldispersionProcess ProcesspatentedbyDow ContinuousfeedofresinandwatertothemixingunitunderhighshearHighviscousresinscanbedispersedwithouttheadditionofsolventsExcellenttransferofprocessparametersfromlabtopilottomanufacturingscaleSubmicronandmonomodularparticlesizedistributions Influenceofprocessparameters Particlesizecanbeinfluencedbythetotalflowrate Significantincreaseinviscositywithdecreasingparticlesizedistribution Influenceofprocessparameters SolidEpoxyResinDispersion CureRate BothCuringagentsarebasedonwatersolubleepoxyamineadducts Dryingtimesbasedondryingtimerecorder Potlife As2KWBepoxysystemsdon thavenecessarilyavisibleendofpotlifeliketheirsolventbornecounterpartsotherpropertiesaretested Some2KWBepoxysystemsbasedonDow sdispersiontechnologyshowexcellentglossretentionovertime 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 14days R T conditionsof720Fand50 55 R H TestMethod ASTMD 1308 coveredspottest 18hr exposuretime norecovery CombinationEpoxy PUDispersion Combinationsarepossiblebutappropriatehardenerselectionisrequired clarity GlossofcuredmixturesisinthesamehighrangeasforthePUDaloneFlexibilityisimprovedwhenPUDisaddedtoEpoxyDispersionsCoatinghardnessfollowstheratioofEpoxytoPUDfor90 stoichiometrichardenerratio Especiallysolventresistanceisimprovedwhenepoxydi