(1.南京理工大学化工学院，南京210094；
2. 上海大众汽车有限公司宁波分公司，宁波 315336；
3. 山东诚泰安全技术咨询有限公司，济南250013)
摘 要: 采用自制的特种炸药利用爆轰法合成粒径为50nm的纳米CeO2。将纳米CeO2以一定比例与环氧树脂(EP)混合，采用浇铸的方法制备纳米CeO2改性的EP薄膜。利用设计的紫外老化试验箱对制备的薄膜进行了21d加速老化试验，对比测试纯EP和改性EP老化前后薄膜的质量和力学性能变化规律。结果表明：纳米CeO2对紫外线表现出较强的屏蔽作用。当纳米CeO2在EP中的质量分数为0.8%时，改性EP薄膜对波长为254nm的紫外吸光度最大，EP薄膜的力学性能有所提高。相比纯EP薄膜，添加纳米CeO2后在紫外线条件下的使用寿命增加62%，对抗拉强度的保持率提高35%。
关键字: 纳米氧化铈；紫外屏蔽；环氧树脂；改性；老化
（1.School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Ningbo Branch, Shanghai Volkswagen Co.Ltd, Ningbo 315336, China;
3.Shandong Chengtai Security Technology Consulting Co.Ltd, Jinan 250013,China）
Abstract:CeO2 nanoparticles with size of 50 nm were produced by detonation method using self-made special explosive. In order to study shielding effect to the ultraviolet, nano CeO2 and epoxy resin (EP) were mixed in a certain proportion to prepare a modified epoxy resin thin film by casting method. The prepared films were accelerated aging for 21 d in ultraviolet inside a home-made test chamber to compare with no aging case, attempting to obtain the improvement of performance and mechanical properties of modified epoxy resin film. The results show that the modified nano ceria-epoxy resin film has strong shielding effect to ultraviolet. The absorbance of modified epoxy resin film to 254nm UV wavelength is maximum when the mass fraction of nano CeO2 is 0.8%. Meanwhile, the mechanical property of the films has been improved. Compared with the pure epoxy resin, the service life of modified epoxy resin extends by 60% and the tensile strength retention rate increases by 35%.
Key words: nano CeO2; UV-shielding; epoxy resin; modification; aging
