Coloration of polypropylene with interference pigment and the effect of wetting agents on its optical properties
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Coloration of polypropylene with interference pigment with and without dispersing agents, namely propylene glycol and poly (ethylene glycol) were studied. Effect of pigment concentrations and dispersing agents on various color properties of the molded specimens, such as reflectance versus wavelength characteristics, angular dependency, K/S data, and flop index were evaluated using the CIE system with goniospectrophotometer. Surface image analysis was also conducted. Based on the above parameters, design equations were developed. The study revealed that the effective concentration of the interference pigment was 0.5% and better color characteristics were found when poly (ethylene glycol) was used as a dispersing agent.
KeywordsColoration of polypropylene interference pigments optical characterization pigments appearance color measurement color color matching process modeling simulation pigmentation pigment optics plastics
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