Short timescale inkjet ink component diffusion

An active part of the absorption mechanism into inkjet coatings

Taina Lamminmäki (Corresponding Author), John Kettle, Pasi Puukko, C. J. Ridgway, P. A. C. Gane

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

The structures of inkjet coatings commonly contain a high concentration of fine diameter pores together with a large pore volume capacity. To clarify the interactive role of the porous structure and the coincidentally occurring swelling of binder during inkjet ink vehicle imbibition, coating structures were studied in respect to their absorption behaviour for polar and non-polar liquid. The absorption measurement was performed using compressed pigment tablets, based on a range of pigment types and surface charge polarity, containing either polyvinyl alcohol (PVOH) or styrene acrylic latex (SA) as the binder, by recording the liquid uptake with a microbalance. The results indicate that, at the beginning of liquid uptake, at times less than 2 s, the small pores play the dominant role with respect to the inkjet ink vehicle imbibition. Simultaneously, water molecules diffuse into and within the hydrophilic PVOH binder causing binder swelling, which diminishes the number of active small pores and reduces the diameter of remaining pores, thus slowing the capillary flow as a function of time. The SA latex does not absorb the vehicle, and therefore the dominating phenomenon is then capillary absorption. However, the diffusion coefficient of the water vapour across separately prepared PVOH and SA latex films seems to be quite similar. In the PVOH, the polar liquid diffuses into the polymer network, whereas in the SA latex the hydrophobic nature prevents the diffusion into the polymer matrix and there exists surface diffusion. At longer timescale, permeation flow into the porous coating dominates as the resistive term controlling the capillary driven liquid imbibition rate.
Original languageEnglish
Pages (from-to)222-235
Number of pages14
JournalJournal of Colloid and Interface Science
Volume365
Issue number1
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Latex
Latexes
Ink
Polyvinyl Alcohol
Styrene
Polyvinyl alcohols
Coatings
Acrylics
Binders
Liquids
Pigments
Swelling
Capillary flow
Surface diffusion
Steam
Surface charge
Polymer matrix
Permeation
Water vapor
Tablets

Keywords

  • Diffusion
  • absorption
  • porosity
  • permeability
  • ink dye adsorption
  • inkjet printing
  • coating

Cite this

Lamminmäki, Taina ; Kettle, John ; Puukko, Pasi ; Ridgway, C. J. ; Gane, P. A. C. / Short timescale inkjet ink component diffusion : An active part of the absorption mechanism into inkjet coatings. In: Journal of Colloid and Interface Science. 2012 ; Vol. 365, No. 1. pp. 222-235.
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Short timescale inkjet ink component diffusion : An active part of the absorption mechanism into inkjet coatings. / Lamminmäki, Taina (Corresponding Author); Kettle, John; Puukko, Pasi; Ridgway, C. J.; Gane, P. A. C.

In: Journal of Colloid and Interface Science, Vol. 365, No. 1, 2012, p. 222-235.

Research output: Contribution to journalArticleScientificpeer-review

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AB - The structures of inkjet coatings commonly contain a high concentration of fine diameter pores together with a large pore volume capacity. To clarify the interactive role of the porous structure and the coincidentally occurring swelling of binder during inkjet ink vehicle imbibition, coating structures were studied in respect to their absorption behaviour for polar and non-polar liquid. The absorption measurement was performed using compressed pigment tablets, based on a range of pigment types and surface charge polarity, containing either polyvinyl alcohol (PVOH) or styrene acrylic latex (SA) as the binder, by recording the liquid uptake with a microbalance. The results indicate that, at the beginning of liquid uptake, at times less than 2 s, the small pores play the dominant role with respect to the inkjet ink vehicle imbibition. Simultaneously, water molecules diffuse into and within the hydrophilic PVOH binder causing binder swelling, which diminishes the number of active small pores and reduces the diameter of remaining pores, thus slowing the capillary flow as a function of time. The SA latex does not absorb the vehicle, and therefore the dominating phenomenon is then capillary absorption. However, the diffusion coefficient of the water vapour across separately prepared PVOH and SA latex films seems to be quite similar. In the PVOH, the polar liquid diffuses into the polymer network, whereas in the SA latex the hydrophobic nature prevents the diffusion into the polymer matrix and there exists surface diffusion. At longer timescale, permeation flow into the porous coating dominates as the resistive term controlling the capillary driven liquid imbibition rate.

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