Pigments Webinar May 2012.ppt - ? 2012 HORIBA, Ltd. All rights reserved. Pigments A pigment is

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2012 HORIBA, Ltd. All rights reserved.Particle Characterization of PigmentsMark BumillerMark.bumiller@horiba.com 2012 HORIBA, Ltd. All rights reserved.OutlineWhy is particle size important?Organic pigments using laser diffraction Inorganic pigments using laser diffraction Ink pigmentsTiO2 study using laser diffractionTiO2 particle size and zeta potential using dynamic light scatteringConclusions 2012 HORIBA, Ltd. All rights reserved.PigmentsA pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption red and green absorbblue reflects 2012 HORIBA, Ltd. All rights reserved.Properties Dependent on Particle SizeHue/Tint Strength Hiding/Transparency Gloss/Flatting and Film Appearance Flocculation Viscosity Stability Weather resistanceGloss vs. % > 1 m 2012 HORIBA, Ltd. All rights reserved.Organic PigmentsCommonly powder formDry milling procedures monitored by dry laser diffraction methodParticle size effects dispersibility of pigment in application mediaWet laser diffraction method to monitor dispersion of organic pigments in low viscosity liquid media 2012 HORIBA, Ltd. All rights reserved.Organic Pigments StudySamples*:2583 Diarylide Yellow 831274 Hansa Yellow 742574 Hansa Yellow 745576 Phthalo Blue 15:31. Select the small, high-dispersion nozzle for the fine particle sizes expected.2. Set the automatic measurement conditions to proper testing range (96-94%T for the laser).3. Set dispersion air pressure to Low.4. To prevent nozzle clogging, remove large agglomerates from sample using 1mm sieve 5. Load enough filtered sample onto feeder chute to perform multiple measurements.6. Take 3 consecutive measurements using the Auto Measurement function.*Thank-you to Lansco Colors, Warwick, RI for supplying the samples for this study. www.pigments.com 2012 HORIBA, Ltd. All rights reserved.1274 Hansa Yellow 74Sample ID ResultsRun 1 50.125Run 2 50.096Run 3 50.442Mean 50.220COV % 0.38Dry Organic Pigment Results2583 Diarylide Yellow 83Sample ID ResultsRun 1 18.386Run 2 18.082Run 3 18.032Mean 18.17COV % 1.052583 Diarylide Yellow 831274 Hansa Yellow 74 2012 HORIBA, Ltd. All rights reserved.5576 Phthalo Blue 15:3Sample ID ResultsRun 1 25.114Run 2 25.546Run 3 25.531Mean 25.397COV % 0.97Dry Organic Pigment Results2574 Hansa Yellow 74Sample ID ResultsRun 1 36.490Run 2 36.618Run 3 36.603Mean 36.570COV% 0.192574 Hansa Yellow 745576 Phthalo Blue 15:3 2012 HORIBA, Ltd. All rights reserved.Inorganic: Iron Oxide, LA-950 Wet 2012 HORIBA, Ltd. All rights reserved.Inorganic: Chromium Oxide Green Micro 90 surfactant to wet powder 0.1% sodium pyrophosphate 2012 HORIBA, Ltd. All rights reserved.Inorganic: Alumina Al2O3 2012 HORIBA, Ltd. All rights reserved.Ink Pigment 2012 HORIBA, Ltd. All rights reserved.TiO2 Commercial Data Sheet 2012 HORIBA, Ltd. All rights reserved.TiO2 : Effect of Size0.05 0.1 0.15 0.20 0.3 0.5 0.8Size (diameter) in mRelative scattering power0.0 0.25 0.50 0.75 1.00 1.25 1.50 1.75Relative scattering powerrutile TiO2 vs. sizeOpacity of TiO2mean 0.25 and 10 m 2012 HORIBA, Ltd. All rights reserved.TiO2 Measurement ProcedureStep 1: Buy a HORIBA LA-950Decide wet or dry analysisWet: disperse sample using surfactant and ultrasoundMethod development using Method ExpertRI, concentration, ultrasoundDry: Use smallest nozzle and highest air pressure 2012 HORIBA, Ltd. All rights reserved.TiO2: Effect of Refractive IndexMeasure sample onceFix real RI, vary imaginaryMinimize R parameter (error calculation)Use 1.0 for imaginary RI 2012 HORIBA, Ltd. All rights reserved.TiO2 for Cosmetics% under 100 nmnanoparticles 2012 HORIBA, Ltd. All rights reserved.TiO2: Wet vs. DryWetDryOnly 8 nm difference!Dry dispersion below 350 nm median 2012 HORIBA, Ltd. All rights reserved.TiO2: Dry Analysis of 2 SamplesAble to reproducibly distinguish2 samlpes with 12 nm difference@ D(v,0.5) 2012 HORIBA, Ltd. All rights reserved.Nano TiO2**Data from HORIBA LB-500 2012 HORIBA, Ltd. All rights reserved.TiO2 Size & Zeta Potential on SZ-100Size, note: Intensity distributionZeta potential @ pH = 7 2012 HORIBA, Ltd. All rights reserved.ConclusionsParticle size important physical parameter requiring analysis for controlLaser diffraction excellent tool down to 30 nmDynamic light scattering for sub micron particle size + zeta potentialHORIBA has products and support for your application requirements 2012 HORIBA, Ltd. All rights reserved.To Learn More: www.horiba.com/particleReceive news of updatesView application/technical notes (>130), webinars (>40), white papers.Talk to us, ask questions 2012 HORIBA, Ltd. All rights reserved.DankeGracias Grazie ObrigadoTacka dig