Resurrection of dead lacquer鈥擟upric potassium chloride dihydrate (K₂CuCl₄路2H₂O) used as the mimic laccase

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• 作者：Weibin Bai ; Lifang Cai ; Dongxian Zhuo ; Yanlian Xu ; Hanyu Xue ; Qinhui Chen ; Jinhuo Lin
• 关键词：Cupric potassium chloride ; Lacquer ; Urushiol ; Polymerization ; Film
• 刊名：Progress in Organic Coatings
• 出版年：February, 2014
• 年：2014
• 卷：77
• 期：2
• 页码：431-438
• 全文大小：1905 K

文摘

Oriental lacquer collected from lacquer trees is widely used as surface coatings for centuries. The lacquer with little activity of laccase is called dead lacquer vividly which cannot be cured automatically. In this study, the cheap copper chloride dihydrate (K₂CuCl₄路2H₂O) was used as a novel catalyst to cure the dead lacquer at room temperature. The redox property of K₂CuCl₄路2H₂O was studied by cyclic voltammetry. The process of oxidative polymerization of urushiol was confirmed by FT-IR, ¹H NMR, UV-vis, and electron spin-resonance spectroscopy. At 75% relative humidity, the dead lacquer film with the gloss of 101.0% and hardness of 0.84 (glass value) could be obtained when the K₂CuCl₄路2H₂O content was 0.6 wt%. The results of the thermal properties and the chemical resistance tests showed that the dead lacquer film catalyzed by K₂CuCl₄路2H₂O had better thermal stability and chemical resistance than those of the raw lacquer film catalyzed by laccase.