Pigments Webinar May 2012.ppt - Horiba · PDF file © 2012 HORIBA, Ltd. All rights...

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Transcript of Pigments Webinar May 2012.ppt - Horiba · PDF file © 2012 HORIBA, Ltd. All rights...

  • © 2012 HORIBA, Ltd. All rights reserved.

    Particle Characterization of Pigments

    Mark Bumiller [email protected]

  • © 2012 HORIBA, Ltd. All rights reserved.

    Outline

    Why is particle size important? Organic pigments using laser diffraction  Inorganic pigments using laser diffraction  Ink pigments TiO2 study using laser diffraction TiO2 particle size and zeta potential using

    dynamic light scattering Conclusions

  • © 2012 HORIBA, Ltd. All rights reserved.

    Pigments A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption

    red and green absorb

    blue reflects

  • © 2012 HORIBA, Ltd. All rights reserved.

    Properties Dependent on Particle Size

    Hue/Tint Strength Hiding/Transparency Gloss/Flatting and Film Appearance  Flocculation  Viscosity  Stability Weather resistance

    Gloss vs. % > 1 µm

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    Organic Pigments

    Commonly powder form Dry milling procedures monitored by dry

    laser diffraction method Particle size effects dispersibility of

    pigment in application media Wet laser diffraction method to monitor

    dispersion of organic pigments in low viscosity liquid media

  • © 2012 HORIBA, Ltd. All rights reserved.

    Organic Pigments Study

    Samples*: •2583 Diarylide Yellow 83 •1274 Hansa Yellow 74 •2574 Hansa Yellow 74 •5576 Phthalo Blue 15:3

    1. 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 74 Sample ID Results Run 1 50.125 Run 2 50.096 Run 3 50.442 Mean 50.220 COV % 0.38

    Dry Organic Pigment Results 2583 Diarylide Yellow 83 Sample ID Results Run 1 18.386 Run 2 18.082 Run 3 18.032 Mean 18.17 COV % 1.05

    2583 Diarylide Yellow 83

    1274 Hansa Yellow 74

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    5576 Phthalo Blue 15:3 Sample ID Results Run 1 25.114 Run 2 25.546 Run 3 25.531 Mean 25.397 COV % 0.97

    Dry Organic Pigment Results

    2574 Hansa Yellow 74 Sample ID Results Run 1 36.490 Run 2 36.618 Run 3 36.603 Mean 36.570 COV% 0.19

    2574 Hansa Yellow 74

    5576 Phthalo Blue 15:3

  • © 2012 HORIBA, Ltd. All rights reserved.

    Inorganic: Iron Oxide, LA-950 Wet

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    Inorganic: Chromium Oxide Green

     Micro 90 surfactant to wet powder  0.1% sodium pyrophosphate

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    Inorganic: Alumina Al2O3

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    Ink Pigment

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    TiO2 Commercial Data Sheet

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    TiO2 : Effect of Size

    0.05 0.1 0.15 0.20 0.3 0.5 0.8 Size (diameter) in µm

    R el

    at iv

    e sc

    at te

    rin g

    po w

    er 0.

    0

    0. 25

    0

    .5 0

    0.

    75

    1 .0

    0

    1. 25

    1

    .5 0

    1.

    75

    Relative scattering power rutile TiO2 vs. size

    Opacity of TiO2 mean 0.25 and 10 µm

  • © 2012 HORIBA, Ltd. All rights reserved.

    TiO2 Measurement Procedure

    Step 1: Buy a HORIBA LA-950 Decide wet or dry analysis Wet: disperse sample using surfactant and

    ultrasound Method development using Method Expert RI, concentration, ultrasound

    Dry: Use smallest nozzle and highest air pressure

  • © 2012 HORIBA, Ltd. All rights reserved.

    TiO2: Effect of Refractive Index Measure sample once Fix real RI, vary imaginary Minimize R parameter (error calculation)

    Use 1.0 for imaginary RI

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    TiO2 for Cosmetics

    % under 100 nm “nanoparticles”

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    TiO2: Wet vs. Dry

    Wet

    Dry

    Only 8 nm difference! Dry dispersion below 350 nm median

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    TiO2: Dry Analysis of 2 Samples Able to reproducibly distinguish 2 samlpes with 12 nm difference @ D(v,0.5)

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    Nano TiO2*

    *

    Data from HORIBA LB-500

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    TiO2 Size & Zeta Potential on SZ-100

    Size, note: Intensity distribution

    Zeta potential @ pH = 7

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    Conclusions

    Particle size important physical parameter requiring analysis for control Laser diffraction excellent tool down to

    30 nm Dynamic light scattering for sub micron

    particle size + zeta potential HORIBA has products and support for

    your application requirements

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    To Learn More: www.horiba.com/particle

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    Danke

    Gracias

    Большое спасибо

    Grazieاُشْكر Σας ευχαριστούμε

    감사합니다 Obrigado

    Tacka dig

    谢谢ขอบคุณครบั

    ありがとうございました

    धन्यवाद நன்ற