Spectrophotometric Evaluation of Urethane Acrylate Based Pigment Colour Stability

The aim of the paper is to analyse the influence of violet and green pigment concentration on acrylate coating colour stability with increased temperature and in UV light. A set of coating formulations were generated with different pigment mass concentrations (0, 1% to 5%) and coating colour change were evaluated at room temperature, at 50°C and in direct sunlight over a 28 day period. After application and UV cure, the samples were examined using spectrometric methods. Spectrometric colour difference measurements were performed using colour system CIEL*a*b* to evaluate their stability over time. It was found that increasing pigment concentration improves the colour stability.