CalcinedKaolin煅烧高岭土.pdf

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1、CalcinedKaolinDehydroxylatedAluminumSilicateHydrousKaolinSEMPlatykaolinparticlesbeforecalcinationAThermalHistoryofCalcinedClayHeatflowbyDSC,weightlossbyTGAEndothermic0.21000Exothermic96-0.292HeatFlow(mW/mg)De-hydration-0.4WeightLoss(%)88-0.6De-hydroxylationSpinelphase842004006008001000Tempera

2、ture(oC)PoleStar200PSEMMediumparticlesize,mediumstructurePoleStar400SEMFineparticlesize,highstructureStructuredCalcinedKaolinsPhysicalproperties•MediumStructure•HighStructure•Smalleraggregate(~0.7μm)•Largeaggregate(1.5-2.0μm)–smallerprimaryparticles–largerprimaryparticles–veryirregularparticl

3、eshape–irregularparticleshape•Largeairvoids(~0.4μm)•Largeairvoids(~1.0μm)•Highvoidvolume(~1.2ml/g)•Moderatevoidvolume(~0,8ml/g)•Highoilabsorption(75-90goil/100g)•Moderateoilabsorption(50-60goil/100g)StructuredCalcinedKaolinsEffectonpaintperformanceMediumStructureHighStructureLowvoidOpacityHig

4、hvoidvolumevolumeLargevoidsOpacitySmallvoidsRegularIrregularparticleMudCrackResistanceparticleshapeshapeLowOilHighOilScrubResistanceAbsorptionAbsorptionCoarseSheenFineparticleparticlesizesizeStructuredCalcinedKaolinsComparisonofImerysproducts16HighOpacilitePoleStar/g)240012StructureMedium8Pol

5、eStarSurfaceArea(m200PLow421.61.20.80.4MeanParticleSize(µm)ImerysCalcinedKaolinProductsComparisonoftypicalpropertiesProductBrightnessMeanSizeHegman(ISO)(d50)μmμmPoleStar200P902.0PoleStar400920.6FlashCalcinedKaolinOpacilite871.630InteriorMattEmulsionPaintsMajoruseforcalcinedkaolin•Interiorwall

6、sandceilings–usuallyformulatedaboveCPVC•opacitybydryhiding•Typically2to5differentextenders•Typicalproperties–highopacity,highwhiteness–goodscrub&mudcrackresistance–lowglossComparisonofImerysCalcinedKaolinsHighqualitymattemulsion(65%PVC)%byWeightFunctionTi-PureR-70615.0TiOpigment(DuPont)2*Calc

7、inedKaolin12.0Functionalextender(Imerys)RopaqueUltra5.0Opaquepolymer(Rohm&Haas)CaCO(d=5μm)13.0Extender350Tamol731A/AMP95(3:1)0.4Dispersants(R&H/DOW)2%Natrosol250MBR17.5Thickenersolution/water(Hercules)ProxelGXL0.1Biocide(ArchBiocides)Foamaste