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COMPARATIVE STUDY OF PRIMARY DRIERS IN OXIDATIVE DRYING PAINTS: MANGANESE(III) ACETYLACETONATE AND COBALT(II) 2-ETHYLHEXANOATE

Authors: Matušková Eliška | Honzíček Jan | Vinklárek Jaromír

Year: 2021

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	COMPARATIVE STUDY OF PRIMARY DRIERS IN OXIDATIVE DRYING PAINTS: MANGANESE(III) ACETYLACETONATE AND COBALT(II) 2-ETHYLHEXANOATE	Polyester resins modified with fatty acids belong to the highly used oxidative drying paints, commonly known as an alkyd resin. Film-formations is based on solvent evaporation and chemical processes proceeding on unsaturated fatty acid chains, also called autoxidation mechanism [1]. The protracted drying of alkyd resin is usually catalysed by primary driers. Nowadays, there is a global demand for the replacement of cobalt(II)carboxylates, which are still the most widely used. This situation was stimulated by European REACH where was cobalt dries classified as a carcinogen 1B [2]. One of the possible alternative could be a manganese(III) acetylacetonate. Catalytic activity of Mn(acac)3 was studied in concentration range 0.1-0.01 wt. % on solvent-borne and high-solid alkyd binders. Prepared coatings were characterized by standardized mechanical tests. Kinetic parameters of autoxidation process, responsible for the chemical drying, has been measured by time-resolved infrared spectroscopy. Subsequently, the respective values were subtracted (half-time, induction period, maximum rate constant, time for maximum intensity of the deformation vibration band). All results were compared with cobalt(II) carboxylates. Based on the results, catalytic activity of manganese(III) acetylacetonate seems to be the same or even better than cobalt(II) carboxylates