Studies on Confirming the type of Dried Urushi Film and Its Formatin Mechanism (Urushi Hardening Study Roport 2)

In a previous report (Ref.1), the auther described the chemical structure of acetone powder (AP, the so-called laccase) of the Japan urushi sap, and dope obtained by the classic Kurome process is interpreted as urushiol orthosilicate. In this paper, the further discussion is given about flake pieces which were accidentally obtained from a broken Al tube containing raw urushi during the summer; also described is dope obtained under special treatment (three ceramic rolls mill (TR) compounding) and hardening while keeping at room temperature and 80% humidity. Precise studies have shown that both have hexagonally and octahedrally oriented ozygen atoms around the center Si atom of the acetone powder. it has been found that three kinds of urushiol silicate and inorganic bond (peroxide) bridging formation, such as -H2C-O-OCaOH or =H2C-O-O-OMgOH, are the true hardeningmechanisms, instead of a hirherto considered enzyme action.