CORRELATION BETWEEN THE STATE OF CURE OF A COIL COATING AND ITS RESISTANCE TO LIQUIDS

The process of cure of the resin of a coil coating is studied by consi dering the heat transfer by convection onto the surfaces and conductio n through the metal and the resin, the mass transport of the solvent b y diffusion-evaporation, and the cure of the resin. Some properties of the coating, such as its resistance to a liquid using the rubtest, an d its flexibility, are determined from experiments. The state of cure (SOC), which can be evaluated by using a numerical model, is correlate d with the properties of the coating. The numerical model enables one to predict the operational conditions necessary to obtain a given valu e of the state of cure. (C) 1996 Elsevier Science Ltd.