Green Paints Based on Waterborne Polyurethane Dispersions

Polyurethane (PU) is the most versatile polymer material, with a wide variety of physical and chemical properties. In particular, waterborne PU is a rapidly growing segment of thepolyurethane coating industry due to environmental legislations such as the clean air, no toxicity and no flammability. A waterborne polyurethane adhesive is constituted by a linear thermoplastic polyurethane which is dispersable into water due to the presence of ionic groups inits structure (i.e. a polyurethane ionomer), which act as an internal emulsifier. The ionic groups in the ionomer impart theability of dispersion of polyurethanes into water, normally producing stable dispersions. This paper is devoted to study the effect of two different chain extenders on some physicalproperties of waterborne polyurethane dispersion which is synthetized by employing of solvent process and usinghydrophil ionomers. In addition, final resin formulation is used in industrial paint, as a green product and the mechanical properties were studied.