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Evaluation of Photoinitiator and Fluorescent Pigments Impact on Color Stability in Pigmented UV-Curable Coatings

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Abstract:

The testing of thin colored coatings based on urethane acrylate composition is a technologically advanced, highly specialized and complex process. For decorative pigmented coatings color stability is crucial quality parameter. The photo chemically curable polymer films were prepared by addition of 3 different radical initiators (KTO, TPO, TPO-L) to aliphatic urethane acrylate composition with various pigments (solid and fluorescent). Coating color change were evaluated in UV chamber (with luminous intensity 130 mw spectrum λmax = 405 nm) after 1 h, 48 h and 72 h. Color measurements were performed according to the CIEL*a*b* color standard to evaluate their stability over time. It was found that pigmented coatings have higher risk of yellowness than clear coatings. Also fluorescent pigments containing red has tendency to yellow after UV light exposure. The influence of the photoinitiator on the color stability were inconsiderable.

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Periodical:

Solid State Phenomena (Volume 320)

Pages:

77-82

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.320.77

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Online since:

June 2021

Authors:

Zane Grigale-Soročina*, Ingmārs Birks, Elina Vindedze

Keywords:

Coating Yellowing, Fluorescent Pigment, Photoinitiators, UV Aging

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© 2021 Trans Tech Publications Ltd. All Rights Reserved

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