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High quality emulsified paints formulation by mean of a software for the statistical design of experiments

Abstract:

The purpose of this work was to evaluate the partial substitution of TiO 2 by any of two synthetic pigments known as vesicular pearls (Beads®,) and opaque polymers (Ropaque®), maintaining the properties and quality of the original paints, by mean of a statistically designed set of experiments using the software Design Expert®. The software was developed using a linear programming model that require the definition of those variables useful for the selection of different alternatives, of the objective function to be optimized, and the restrictions to be applied to guarantee the products quality. The defined response variables were those properties with the highest sensitivity to the amount of TiO 2 used in the paint formula, that is: cracking, white index, contrast ratio, and the cost reduction. The latest was also taken as the minimization objective function. The inlet variables were selected between those with the highest expected influence over the response variables, that is: the main pigment, the three extender pigments, the substitutive technology selected (vesicular pearls or opaque polymers), and the latex resin type. Once the optimal formulations were obtained it was possible to assert that the selected response variables were those that characterize an emulsified paint of the highest quality. The selected inlet variables showed to have a clear and direct influence on the variables that characteristics this paints. The partial substitution of TiO 2 by any of the two substitutive technologies (Beads® y Ropaque®) reached the Standard quality required by the norms that characterize emulsified paints of first quality and at a minor cost.