dispersion of pigments & additives in inks
TRANSCRIPT
Dispersion of Pigments & Additives in Inks Dr.-Ing. Felipe Wolff-Fabris April, 28th 2016
Outline
• EZD – European Center for
Dispersion Technologies
• The 3 basic dispersing steps
• Dispersion technologies
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Partial view of the analytical lab
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European Center for Dispersion Technologies
Location: Selb, Germany Established in 2014
Analytics & product quality
Process Engineering
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European Center for Dispersion Technologies
Additive synthesis and
functionalization
Dispersion medium (Matrix)
Dispersion process
Characterization
• Mission: To significantly improve the industrial manufacturing and development of dispersions.
Formulation
Training
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Services of the EZD
Services:
Individual consultancy
Market research
Product development
Process optimisation
Analytical services
Training and knowledge transfer
Fields of application: Thermosets (adhesives and
resins)
Inks and Paints Coatings
Elastomers
Releasing agents and lubricants
Ceramics and Porcelain
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Services of the EZD
Services:
Individual consultancy
Market research
Product development
Process optimisation
Analytical services
Training and knowledge transfer
More infos at: www.skz.de/4683
Outline
• EZD – European Center for
Dispersion Technologies
• The 3 basic dispersing steps
• Dispersion technologies
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Components of a suspension
Pigments Dispersion media
Product
Binder Additive
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Agglomeration
Al2O3, Source: EZD
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Agglomeration
SiO2, Source: EZD
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Dispersion of additives
Particles
Agglomerates (soft aggregates)
(reversible aggregates)
Aggregates
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Producing a suspension
1. Wetting • The particle surface should be wetted by the dispersion media.
2. Dispersion process • Agglomerates should be mechanically destroyed in order to
homogeneously disperse the primary particles.
3. Stabilization • By stabilizing a suspension, re-agglomeration of the particles can be
avoided.
Outline
• EZD – European Center for
Dispersion Technologies
• The 3 basic dispersing steps
• Dispersion Technologies
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Dispersion of additives/pigments in an ink
• Elongation: • Shear:
• Turbulence:
• Cavitation:
• Impact:
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Why is a high dispersion quality so important?
• Preventing clogging of the inkjet nozzles
• Improvement of the processability
• Improvement of optical properties (color strength)
• Transparency
• Extension of the product stability
• ...
Enhancement of the processability and the overall product quality
Dispersion technologies
Dissolver Rotor-stator homogenizer Three roll mill
High pressure homogenizer Beads mill Ultrasound
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Beads mill
• Principle of action:
• Loading: impact, shear, elongation
• Parameters: velocity, time duration / number of passages, beads (material, size and content)
Quelle: NETZSCH Feinmahltechnik
Thank you for your attention
Dr.-Ing. Felipe Wolff-Fabris Head of the European Center for Dispersion
Technologies (EZD) Weissenbacher Str. 86
95100 Selb Phone: +49 9287 998800 Fax: +49 9287 9988013 E-Mail: [email protected]