透明耐紫外聚酯薄膜紫外老化性能的研究

Study on UV Ageing Properties of Transparent UV Resistant Polyester Film

通过在聚对苯二甲酸乙二醇酯(PET)薄膜中添加3种相同浓度不同类型的有机紫外线吸收剂,并对PET薄膜试样紫外老化前后性能进行测试,研究紫外线吸收剂对PET薄膜紫外老化性能的影响。结果表明:PET薄膜的紫外老化性能与紫外线吸收剂结构有关,相对于三嗪类和苯并三唑类紫外线吸收剂,氧氮杂萘酮类结构紫外线吸收剂由于具有超共轭结构,表现出紫外吸收波长红移、更宽的紫外吸收范围和更强的紫外吸收强度;随着紫外线辐照能量增加,3种耐紫外透明薄膜试样的力学性能和光泽度均逐渐下降,黄色指数逐渐上升,当紫外辐照能量高于120 kWh/m^(2)时,3种耐紫外透明薄膜试样老化前后的性能差距逐渐明显,其中含氧氮杂萘酮类超共轭结构紫外线吸收剂的薄膜试样在紫外老化前后性能差异最小,耐老化性能最好。

Three kinds of organic ultraviolet absorbers with the same concentration were added to polyethylene terephthalate(PET)films,and the properties of PET films before and after UV ageing were tested,and then the effects of ultraviolet absorbers on the UV ageing properties of PET films were studied.The results show that the UV ageing properties of PET films are related to the structure of ultraviolet absorber.Compared with triazine and benzotriazole ultraviolet absorbers,oxazinone ultraviolet absorber exhibits red shift of UV absorption wavelength,wider UV absorption range,and stronger UV absorption intensity because of its hyperconjugated structure.With the increase of ultraviolet radiation energy,the mechanical properties and glossiness of the three kinds of UV resistant transparent films decrease gradually,and the yellow index increases gradually.When the ultraviolet radiation energy is higher than 120 kWh/m^(2),the property differences of the three kinds of UV resistant transparent films before and after ageing are obvious.The property difference of the film containing oxazinone hyperconjugated structure ultraviolet absorber before and after UV ageing is the smallest,and the ageing resistance is the best.