Drier influence on the curing of linseed oil

Fourier transform infrared spectroscopy has been used to investigate the ox idative polymerisation of linseed oil in presence of cobalt 2-ethylhexanoat e drier. Cobalt drier addition provokes the acceleration of all reactions i nvolved in oxidation and the formation of surface solid film. Quantificatio n of oxidation products using SF4 and NO treatments show lower concentratio ns in carboxylic acids, ketones and alcohols, for films cured with cobalt d rier. Photoacoustic spectroscopy has been used to analyse oxidation profile s at the surface of the solid film formed in presence of cobalt drier. Efficiency as peroxides decomposers of cobalt, zirconium and calcium/zircon ium drier, alone and in combination, were compared, by measuring variations of the peroxide value as a function of oxidation time. Indeed, peroxide va lue determination in oxidised drying oils can be considered as a measure of the extent of curing. II was shown that the activity of primary drier (Co) was modified by addition of secondary drier such as Zr or Ca/Zr. (C) 2000 Elsevier Science S.A. All rights reserved.