Effect of Additive Reagents on the Reactivity of Lacquer Tree Paint

Osamu WATANABE* and Katsutoshi NAGAI

Material Technology Department, Fukushima Technology Centre; 1-12, Machiikedai, Koriyama-shi 963-0215 Japan
Department of Materials Science and Engineering, Faculty of Engineering, Yamagata University; 4-3-16, Jonan, Yonezawa-shi 992-8510 Japan

Additives used in industrial arts of lacquer tree paint were systematically classified into 9 groups of reagents from the components involved in them and the effect of the reagents on the reactivity of lacquer tree paint was investigated and discussed on the basis of reversed micelle structure of urushiol. The effects of the reagents added on the curing reaction, the chemical reaction of catechol ring of urushiol, and their reactivity were examined by measurements of curing time and discoloration of paint film, and mass analysis of thermally eliminated molecules from paint film, respectively.
From the results obtained in the present study, phenol compounds, aromatic amines, aliphatic amines, and unsaturated fatty acids having more than two double bonds were found to be reactive with urushiol. Furthermore, the effect of the acceleration or the inhibition of reagents added on the reactivity of urushiol was confirmed to be dependent on their molecular structure.

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