High solids polyurethane (PU) coating formulations were developed by reacting three different castor–oil–based polyester–polyols with aromatic as well as aliphatic isocyanate adducts in different NCO/OH ratios. Structure of polyurethane resins was confirmed by FTIR spectroscopy. The molecular weight between two crosslinks (Mc) and solubility parameter of the samples (polymer films) were determined by a swelling method. The polyurethane resins were coated on test panels and tested for their flexibility, scratch hardness, cross-hatch adhesion, impact, pencil hardness and solvent resistance as per standards. The effect of catalyst, structure of isocyanate and flexibility of polyols on the resulting polyurethanes was evaluated. Thermal stability of these polymers was determined by thermogravimetric analysis (TGA).
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Somani et al. (2004) studied this question.
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