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首页> 外文期刊>Journal of Applied Polymer Science >Laccase-catalyzed polymerization drying of Chinese lacquer sap with TiO2 nanoparticles
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Laccase-catalyzed polymerization drying of Chinese lacquer sap with TiO2 nanoparticles

机译：用TiO2纳米粒子的中国漆液SAP的漆酶催化聚合干燥

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摘要

Nano-TiO2/lacquer hybrid coatings are prepared by the blend of nano-TiO2 and lacquer sap. Nano-TiO2 particles are involved in the laccase-catalyzed polymerization process of urushiol, which improves the properties of lacquer film. With increasing nano-TiO2 from 0 to 5 wt %, the drying time of lacquer film to reach hardened dryness decreases from >12 h to 8 h 30 min under 30 degrees C and 80% relative humidity. Gel permeation chromatography analysis shows that the addition of nano-TiO2 accelerates the polymerization of urushiol. It is also related to the formation of TiOC bonds due to the reaction between nano-TiO2 and the radicals produced by laccase-catalyzed oxidation. The pencil hardness, flexibility, and adhesion of hybrid lacquer film can be improved and reach 4H, 1 mm, and grade 2, respectively. Its inhibition rate against Escherichia coli and Staphylococcus aureus increases from 22.6% and -21.4% to 49.2% and 67.8%, respectively. Furthermore, nano-TiO2 hybrid lacquer films also possess higher thermo-stability than the raw lacquer film. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45865.
机译：纳米TiO2 /漆杂种涂层由纳米TiO2和漆液中的混合物制备。纳米TiO2颗粒涉及尿精的碱酶催化聚合过程，从而改善了漆膜的性质。随着纳米TiO 2的增加，从0到5wt％，漆膜的干燥时间达到硬化干燥的干燥时间从> 12小时降低30℃和80％相对湿度的30分钟。凝胶渗透色谱分析表明，添加纳米TiO2加速尿精的聚合。由于纳米TiO 2之间的反应和通过漆酶催化氧化产生的基团的反应，它也与TiOC键的形成有关。杂交漆膜的铅笔硬度，柔韧性和粘附性可以分别改善和达到4小时，1mm和2级。其对大肠杆菌和金黄色葡萄球菌的抑制率分别从22.6％和-21.4％增加到49.2％和67.8％。此外，纳米TiO2杂交漆膜也具有比未生漆膜更高的热稳定性。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45865。

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