Abstract
Assessment of the state of a pigment dispersion in powder coatings is hindered by the lack of a simple and effective method of evaluation, particularly during the production process. A method for evaluating dispersion quality in cured powder coatings or in samples taken immediately after the extrusion process is described in this paper. Quantitative information of pigment dispersion were obtained using plasma etching-SEM-image analysis. In order to correlate the differences in the extrusion equipment and, consequently, the energy input of the dispersion process, two different formulations were studied, each prepared using three different extrusion units. The procedures are described in detail and the results are compared to those obtained using colour difference measurements. Pigment size distribution plots correlate well with measured colour differences and with the energy inputs of the different extrusion units used.
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