两种波长紫外光辐照对生漆涂层性能及组成的影响  

Effect of Two Wavelengths of Ultraviolet Irradiation on Properties and Composition of Raw Lacquer Coating

作　　者：王珂[1] 周和荣[1] 吴涛[1] 赵阳 方北松 朱诗宇 Wang Ke;Zhou Herong;Wu Tao;Zhao Yang;Fang Beisong;Zhu Shiyu(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Jingzhou Cultural Relics Protection Center,Jingzhou,Hubei,434000,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [2]荆州文物保护中心,湖北荆州434000

出　　处：《涂料工业》2023年第4期21-27,共7页Paint & Coatings Industry

基　　金：国家重点研发计划(2019YFC1520400)“馆藏典型脆弱有机质文物病害防治与评价技术研究”。

摘　　要：采用UVA-351和UVA-340紫外光辐照,研究了生漆涂层老化过程中的表面性能和组成变化,并分析其老化机制。结果表明,生漆涂层经紫外光辐照后,其失光率增加,硬度降低,表面缺陷增多,其中UVA-340紫外光辐照后的试样表面老化程度更严重;UVA-351紫外光辐照后生漆漆酚中羟基、苯环双键和部分侧链共轭双键降解,羰基增加,涂层老化主要是漆酚降解;而UVA-340紫外光辐照后的生漆涂层中羰基含量增加,羟基含量降低程度较大,共轭双键降解时间缩短,涂层老化主要是漆酚降解以及侧链双键变化引起的物理和化学作用。In this paper,the surface properties and composition changes of raw lacquer coating during aging were investigated by ultraviolet(UV)irradiation with wavelength of 351 nm and 340 nm,and its aging mechanism was analyzed.The results showed that light loss rate and surface defects of the lacquer coating increased,and the hardness decreased after UV irradiation.The surface aging degree of the sample after 340 nm UV irradiation was more serious.After 351 nm UV irradiation,the hydroxyl,conjugated double bonds of benzene ring and some side chains in raw urushiol were degraded,and the carbonyl group increased.The coating aging was mainly caused by urushiol degradation.However,the carbonyl content in the lacquer coating increased after 340 nm UV irradiation,the hydroxyl content decreased significantly and the conjugated double bond degradation time was shortened.The coating aging was mainly caused by the urushiol degradation and the changes of double bonds in sidechains.

关 键 词：生漆涂层 紫外光辐照 波长 失光率 红外光谱 光电子能谱 

分 类 号：TQ635.3[化学工程—精细化工]