Abstract
An organic–inorganic hybrid condensate formed by the reaction of lacquer sap and organic functional silane was examined to develop a naturally drying lacquer. The hydroxyl group of urushiol contained in the lacquer sap underwent alcoholysis reaction with the organic functional silane and generated a high molecular weight polymer of polysiloxane. The natural drying process of the hybrid lacquer film is a hydrolysis reaction. In addition, the activities of the alkoxy groups in the organic functional silane showed that the methoxy activity was higher than ethoxy, and trimethoxy activity was higher than dimethoxy. The amino residues in organic functional silane react with the cathechol ring of urushiol, and then the hybrid oxidizes to a dark color. However, there is a tendency for the ring-opening reduction of an epoxy group to produce a light color due to the coexistence of epoxy silane.
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