Studies on the effect of the size of waterborne polyurethane nanoparticles on properties and performance of coatings

Abstract

Present research work was performed utilizing prepolymer mixing process and varying NCO:OH mole ratios. Waterborne polyurethane dispersions (WBPUs) were prepared from phosphorous containing polyester polyol and isophorone diisocyanate. These prepolymers were neutralized by triethylamine followed by the addition of optimized quantity of water. Diethylenetriamine was used as a chain extender. These WBPUs were further coated on mild steel panels, glass panels, and wood. Chemical structure was confirmed using instrumental methods. Microtrac particle size analyzer was used to analyze the particle size. An impact of the size of nanoparticles on the performance of coatings was explained by different testing methods.