Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 369, Issue -, Pages 426-434Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.11.065
Keywords
Offset printing liquids; Linseed oil; Calcium carbonate; Spreading; Imbibition; Porous structure; Pore surface area
Categories
Funding
- TEKES
- Finnish Funding Agency for Technology and Innovation
- Thermal Effects and Online Sensing (THEOS) [40124/08]
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Spreading of oils and water on porous and pre-saturated model carbonate coating structures was studied with high speed video imaging. The short-time data were complemented with long time absorption and wicking experiments. The results indicate a strong dependence between surface structural features of the pigment tablets and water spreading at short times, both in non-saturated and water pre-saturated cases, while the oil spreading is mainly dependent on the liquid properties. Sodium polyacrylate dispersant on pigment surfaces is shown to contribute to water spreading and absorption. On pre-saturated structures the liquid-liquid interactions are dominant and the majority of results support spreading according to the molecular kinetic model. The evidence supports the hypothesis of S. Rousu, P. Cane, and D. Eklund, [Influence of coating pigment chemistry and morphology on the chromatographic separation of offset ink constituents, in The Science of Papermaking Transactions of the 12th Fundamental Research Symposium, FRC The Pulp & Paper Fundamental Research Society, Oxford, UK, 2001, p. 1115] that at long times the oils absorb into the porous structure at a rate proportional to the ratio of viscosity and surface tension, provided there is no sorptive action with the binder. A combination of nanosized pores and large surface area is useful for providing sufficient absorption capability for carbonate based coatings. (C) 2011 Elsevier Inc. All rights reserved.
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