FORMULATION OF NEW MODIFIED ALKYD RESINS AND THEIR APPLICATION IN THE FIELD OF SURFACE COATINGS

Abstract

In the ongoing shift from solvent to water-based coatings, alkyds have stubbornly resisted the change for valid reasons. Solvent-based alkyds are low cost, efficient and versatile, with a long history of proven performance in architectural, industrial and specialty applications as they offers excellent adhesion, hardness, gloss and corrosion resistance. Alkyd resins are considered modified polyester resins, which may be modified with many chemicals such as polybasic acids, polyhydric alcohols and/or fatty acids to produce resins with different properties and give the final surface coating formulations wide performance range. In this research, we prepared the modifiers N,N-bis(2-hydroxyethyl)thiophene-2-carboxamide (HETCA) 3 and N,N-bis(2-hydroxyethyl)furan-2-carboxamide (HEFCA) 4 by the reaction of 0.1 mole of aromatic five memebered ring (thiophen or furan)-2-carboxylic acid (1a or 1b), respectively, with 0.1 mole of freshly distilled diethanolamine (DEA) 2 in xylene. The reaction mixture was allowed to reflux with Dean Stark apparatus until the theoretical