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Curing processes in solvent-borne alkyd coatings with different drier combinations.

S J F Erich1, L G J van der Ven, H P Huinink

  • 1Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

The Journal of Physical Chemistry. B
|April 14, 2006
PubMed
Summary

Researchers investigated how cobalt, calcium (Ca), and zirconium (Zr) driers affect alkyd coating curing. Adding Ca and Zr as secondary driers accelerated the cross-linking front, with signal decrease linked to diffusing reactive species.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Chemistry

Background:

  • Growing environmental concerns and legislation impact the coatings industry, particularly regarding catalysts like cobalt due to potential carcinogenicity.
  • There is limited understanding of how driers influence the in-depth curing process of alkyd coatings.

Purpose of the Study:

  • To investigate the effect of cobalt (primary drier) combined with calcium (Ca) and zirconium (Zr) (secondary driers) on the in-depth curing of high-solid solvent-borne alkyd coatings.
  • To explore the phenomenon of signal decrease in the un-cross-linked region of the coating during curing.

Main Methods:

  • Utilized a novel high-spatial-resolution Nuclear Magnetic Resonance (NMR) setup for profiling alkyd coating curing.
  • Studied the influence of primary (cobalt) and secondary (Ca, Zr) driers on the cross-linking front progression and signal intensity in the underlying layers.

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Main Results:

  • The addition of Ca and Zr as secondary driers was observed to increase the speed of the cross-linking front.
  • A proportional decrease in NMR signal was detected in the deeper, un-cross-linked region below the front.
  • This signal decrease was found to be inversely proportional to the coating thickness (L), supporting a model of diffusing reactive species.

Conclusions:

  • Calcium and Zirconium act as effective secondary driers, accelerating alkyd coating cure rates.
  • The observed NMR signal decrease is attributed to slowly reacting species diffusing and subsequently cross-linking in deeper coating layers.
  • The findings provide valuable insights into the complex in-depth curing mechanisms of alkyd coatings, crucial for developing environmentally friendlier formulations.