Studies on Synthesis of the Enzymic Polymerized Urushi Liquid that has Natural Drying Property under a Low Humidity Environment

为了开发在低湿度环境下具有自然干燥性能的聚合漆，我们进行了基础实验，并在恒温恒湿箱中检查了当漆酶通过酶促氧化干燥漆液时涂膜随时间的硬化过程。根据生漆和蔗糖漆在干燥过程中红外光谱的变化以及抗氧化性能的变化，推测生漆中酶促聚合容易使漆液中的侧链发生自氧化。结果，测量了漆涂膜和液体薄层的干燥性能和聚合度的进行时间的变化。在低湿度环境下自然干燥的时间内漆酚的分子量分布被认为单体成分减少到27%或更少。生漆通过重复的“Kurome”进行酶氧化，减少漆酚单体。此外，在该反应中，我们开发了一个关系式，因为在变化中存在相关性，确定了羟基值和抗氧化能力降低，侧链的抗氧化更容易发生。

We conducted a basic experiment for the purpose of developing polymerized urushi that has a natural drying property in a low humidity environment, and examined the hardening process of the coating film with time as the urushi liquid dried by the enzymic oxidation using laccase in a constant temperature and humidity chamber. We postulated that the auto-oxidation of the side chain easily occurs in the urushi liquid due to the enzymic polymerization based on the change in the IR spectra during the drying process and anti-oxidation property of raw and sugurome urushi. And, as a result, the change in the progress time of the drying property and degree of polymerization of the urushi coating film and liquid thin phase were measured. The molecular weight distribution of the urushiol in the time that naturally dries in a low humidity environment was admitted that the monomer component decreased to 27% or less. Raw urushi undergoes enzymic oxidation by repetitive "Kurome" and decreases the urushiol monomer. Also, in this reaction, we developed a relation formula because there is a correlation in the changes, it was determined that the hydroxy value and anti-oxidization power decrease and the anti-oxidation of the side chain more easily occurs.