樹脂変色の評価方法に関する研究

－新規塗料開発のための汎用技術の構築－

抄録

Coating materials degrade in ways such as yellowing and whitening through the effects of heat, ultraviolet radiation, water, etc. As the degradation seen in coating materials is caused by a complex se.ries of external factors, it is difficult to examine the individual effect of each external factor. In the product development stage, it is common to evaluate color change after long-term exposure in the open air, exposure to ultraviolet radiation and water for several months in an accelerated weathering machine, or immersion in several types of chemicals,but these procedures take a very long time. In this study, we used phototransmittance to evaluate the color change of a coating base made by mixing a polymer and additives. By also taking the environment in which the coating would be used into consideration and evaluating several factors at a time, we were able to reduce the evaluation time greatly.