Effect of particle size distribution on stress development and microstructure of particulate coatings

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Abstract

The role of pigment particle size distribution on stress and microstructure development was studied for coatings prepared from aqueous suspensions of ground calcium carbonate (GCC) and latex binder. Stress development was monitored using a modified beam deflection technique under controlled environment. Microstructure was characterized by scanning electron microscopy (SEM) and cryogenic SEM. For coatings containing only GCC particles and no latex, a wide particle size distribution resulted in a significant particle size gradient in the cross-sectional microstructure and irregular stress development. With latex addition, uniform microstructures were observed in coatings with either wide or narrow GCC particle size distribution. GCC/latex coatings prepared using GCC with a wide particle size distribution developed a higher stress than those prepared using GCC with a similar average particle size but a narrow particle size distribution. The higher stress is related to the particle packing that results in smaller pore sizes and larger capillary pressures that drive compaction. In coatings prepared with the same GCC particles but different latex binders, the stress and cracking behavior of the coating depends on the latex properties.

Original languageEnglish (US)
Pages (from-to)455-465
Number of pages11
JournalJournal of Coatings Technology and Research
Volume14
Issue number2
DOIs
StatePublished - Mar 1 2017

Bibliographical note

Funding Information:
The authors would like to gratefully acknowledge support from the WestRock Company and the industrial supporters of the Coating Process Fundamentals Program of the Industrial Partnership for Research in Interfacial and Materials Engineering (IPRIME). Acknowledgements also go to Gary Fugitt, Kyle Price, Chris Frethem, and Wieslaw Suszynski for their contributions to this project. Parts of this work were carried out in the Characterization Facility, University of Minnesota. The Hitachi SU8320 CryoSEM and Cryospecimen preparation system were provided by NSF MRI DMR-1229263.

Funding Information:
Acknowledgments The authors would like to gratefully acknowledge support from the WestRock Company and the industrial supporters of the Coating Process Fundamentals Program of the Industrial Partnership for Research in Interfacial and Materials Engineering (IPRIME). Acknowledgements also go to Gary Fugitt, Kyle Price, Chris Frethem, and Wieslaw Suszynski for their contributions to this project. Parts of this work were carried out in the Characterization Facility, University of Minnesota. The Hitachi SU8320 CryoSEM and Cryospecimen preparation system were provided by NSF MRI DMR-1229263.

Keywords

  • Drying behavior
  • Ground calcium carbonate (GCC)
  • Particle size distribution
  • Particulate coatings
  • Stress development

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