Self-curing with epoxy groups

Isocyanate-free cathodic ED coatings. Most of the resins used in the cathodic electrodeposition (CED) coatings are made from modified epoxy resin and blocked polyisocyanate in which the crosslinking is achieved by polyurethane and polyurea formation. A resin system has been developed that is isocyanate free and avoids not only the toxicity aspect, but also, to a great extent, the weight loss of the coating upon baking. Chintankumar J. Patel, Hitesh Hirani, Ashok Dighe. The adoption of a "Green" approach to the manufacture and application of paints and coating helps users minimize environmental impact [1]. Therefore the current trend in the coating industry is towards the eco-friendly coatings such as waterborne coatings. Along with elimination of organic solvents from the coating formulation, high transfer efficiency during paint application is also very important as it helps not only in meeting environmental regulations and cutting costs, but also provides a safer work place [2]. The method of applying waterborne coating called electrodeposition was introduced during 1960s. It fulfills the requirements of low pollution and high transfer efficiency [3]. Since its introduction, the process has been a growing coatings technology that provides excellent corrosion protection with more effective paint utilization, uniform thickness, good throwing power, operational efficiency and safety. [4,5,6,7].