Evaluación del hierro como agente de secado para uso en una emulsión alquídica.

Abstract

In the coatings industry, alkyd resins are becoming very important as binders thanks to their independence from petroleum resources. However, the use of these resins requires the use of organic solvents, which are being restricted by environmental regulations due to the emission of volatile organic compounds into the environment, mainly into the atmosphere. For this reason, it is considered necessary to replace them with emulsions based on alkyd resins. In the present study, alkyd emulsions were synthesized under the phase inversion method (EIP), which consisted in adding water to the resin and stirring until the water-in-oil emulsion reversed its phases to an oil-in-water emulsion. Results yielded droplet diameters between 2.5 and 152.5 μm, which indicates that a macroemulsion was obtained. Cobalt and several of its compounds are used in the alkyd industry, which causes workers in these industries are exposed mainly to cobalt inhalation, reports suggest that this exposure has toxic manifestations that affect the respiratory system in addition to exercising a possible carcinogenic activity (Bucher et al., 1999, Dominique Lison, 1996, D. Lison, De Boeck, Verougstraete, & Kirsch-Volders, 2001); In order to reduce these health risks, the search for alternatives for Cobalt blotters is intensified. This study evaluated the iron as a drying agent for the alkyd emulsion obtained by formulating the combination of said metal with ascorbic acid as a reducing agent; In charge of inducing oxidation, by reducing iron ions, in order to validate the drying process by means of ASTM D1640-03. Within the formulations made in this research, a total drying time of 6 hours was reached, which exceeded the commercial secant results.