Oxidovanadium(V) dithiocarbamates as driers for alkyd binders
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Oxidovanadium(V) dithiocarbamates as driers for alkyd binders Iva Charamzova´, Jaromı´r Vinkla´rek, Petr Kalenda, Ivana Cı´sarˇova´, Jan Honzı´cˇek
American Coatings Association 2020 Abstract A series of oxidovanadium(V) dithiocarbamates were synthesized by the conventional synthetic procedure and characterized by analytical methods. Structures of two representatives were determined by X-ray diffraction analysis on single crystals. The initial screening of catalytic alkyd drying, performed on a commercial solventborne alkyd resin of medium oil length, revealed a promising activity of oxidovanadium(V) dithiocarbamates, which was further proved on several alkyd formulations including slow-drying highsolid binders. Kinetic behavior of the catalyzed autoxidation process, investigated by time-resolved infrared spectroscopy on a thin alkyd film, was found to be very different from commercial cobalt carboxylates. Appearance of oxidovanadium(IV) species upon the curing process was evidenced by EPR spectroscopy.
behavior of the catalyzed autoxidation process, investigated by time-resolved infrared spectroscopy on a thin alkyd film, was found to be different from commercial cobalt carboxylates. Appearance of oxidovanadium(IV) species upon the curing process was evidenced by EPR spectroscopy.
Graphic abstract Oxidovanadium(V) dithiocarbamates were established as primary driers for solventborne and high-solid alkyd formulations. The kinetic This paper was presented at the 15th Coatings Science International Conference on June 24–29, 2019, in Noordwijk, the Netherlands. I. Charamzova´, P. Kalenda, J. Honzı´cˇek (&) Institute of Chemistry and Technology of Macromolecular Materials, Faculty of Chemical Technology, University of Pardubice, Studentska´ 573, 532 10 Pardubice, Czech Republic e-mail: [email protected] J. Vinkla´rek Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska´ 573, 532 10 Pardubice, Czech Republic I. Cı´sarˇova´ Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, 128 43 Prague 2, Czech Republic
Keywords Alkyd, Vanadium, Autoxidation, Air-drying paints, Primary drier
Introduction Air-drying paints, including alkyd binders, are widely used for protective and decorative coatings as they fulfill current ecological requirements due to a high content of raw material accessible from renewable sources.1 At ambient temperature, they exhibit a very slow film formation when not treated by additives. After fast solvent evaporation, the chemical drying proceeds sluggishly as it is based on autoxidation on polyunsaturated fatty acids originating from modifying plant oils.2 In practice, the drying process
J. Coat. Technol. Res.
is accelerated by additives known as primary or surface driers. In the case of baking enamels, curing of the alkyd binder is accelerated by elevated temperature.2,3 Cobalt(II) carboxylates are currently the most common driers used for industrial use and hobby market. This is not
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