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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/m2, 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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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