超臨界CO₂を希釈剤として用いた塗装噴霧の観察

抄録

In order to reduce the VOC (Volatile Organic Compounds) emission from the coating processes, supercritical CO₂ was used as the alternative material of thinner component in paint. However, there were few investigations of the characteristics of paint spray with supercritical CO₂. In this study, spray pattern and droplet distribution on the coating surface were measured using the high speed camera images under the various conditions of CO₂ additive rate. In the experiment, the additive rate of CO₂ is changed from 0% to 60%. As a result, it was confirmed that the atomization characteristics was strongly influenced by the additive rate of CO₂. And the spray characteristics were enhanced by the additive of supercritical CO₂.