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Optimization of formulation for emulsion paint of highest quality by use of a software for statistical design of experiments

Abstract:

To counteract the increasing costs of TIO2 in the coating industry, measures have been taken to reduce its use in paints sold in the extensive commercial market. In this study, the partial substitution of titanium dioxide by synthetic pigments such as vesicular beads (Beads®) or opaque polymers (Ropaque®), while maintaining the properties and quality of a first-rate paint, was assessed. In order to achieve this, the Design Expert® software, which allows the statistical design of experiments, was used. The input and output variables to be used by the software were determined. The output variables were: cracking, resistance to washing, whiteness factor, contrast ratio and the cutting down of costs (objective to be minimized). The input variables were: main pigment, pigment spreadability, substitute technologies, and the type of latex resin. The experiment showed that the output variables defined are typical of first-rate emulsified paints and the input variables have a direct impact on the variables that typify this paint. By partially substituting titanium dioxide by the two substitute technologies (Beads® and Ropaque®), the quality index that is expected of first-rate emulsion paints is successfully reached and at a lower cost.