Preparation and Evaluation of Epoxy Binders Based on Rosin as Organic Coating for Steel

In this work, modification of rosin as epoxy organic coating was reported. Epoxy resins were prepared from modified rosin, rosin Diels-Alder adducts, rosin formaldehyde and their ketone. These adducts were reacted with epichlorohydrine in the presence of NaOH as a catalyst to produce epoxy resins. The preparation of the curing agents for the epoxy resins based on rosin poly (amideimide) was investigated. The recent advances in manipulating patterned rosin arrays and patents are reviewed with a focus on the progress of production of epoxy resins based on biopolymer and natural products and their epoxy organic coating applications. Keywords: Rosin, corrosion protection, organic coatings, epoxy resins, coating characteristics. 1. INTRODUCTION Epoxy resins have been widely used in many industrial applications because of their good heat and chemical resistance, superior mechanical and electrical properties and excellent process capabilities [1]. Intensive research efforts have been devoted to develop new epoxy resins through chemical and physical modifications of the classical resins in the last few years [2, 3]. It was also noted that the epoxy resin based paints generally offer very good corrosion protective properties and are widely used for different applications. Rosin is a complex mixture of mainly twenty carbon atom fused rings, mono-carboxylic acids and a small amount of nonacidic components, where the resin acid molecule has double bonds and the carboxylic acid group, which may be possible for a derivative to be used that maintains the carboxylic acid group. Several patents used rosin in epoxy resin formulation as linking agents [4-8]. Modified epoxy resins comprising the reaction product of rosin and a linking molecule reacted with an epoxy resin are disclosed. Aqueous dispersions and coatings comprising these resins are also reported [4, 5]. On the other hand, rosin was modified and used as a solid curing agent in a composition for coating a substrate with a powder coating comprising a solid polyepoxide resin [6]. Rosin as crosslinking agent is essentially free of active hydrogen functional groups. Methods for preparing rosin as crosslinking agents for aminoplast formulation were investigated