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Room temperature vulcanized silicone rubber (RTV-SiR) is an important polymer coating material for high voltage insulators. The ageing behavior of RTV-SiR under long-term exposure to environmental stimuli is an essential consideration for its field applications. In this study, composite coatings were prepared by incorporating nanometer-scale silicon dioxide (SiO2) and aluminum trihydrate (ATH) into RTV-SiR. Then the composite coating samples were conducted accelerated ageing for 9 000 h, and their micro-morphology, hydrophobicity class (HC), leakage current, Fourier transform infrared spectroscopy (FTIR), electrical strength, and mechanical strength were tested to investigate the ageing characteristics of SiO2/ATH-filled RTV-SiR. The results show that the addition of SiO2 and ATH fillers to RTV-SiR enhances the anti-degradation capability and environmental stress resistance of the composite coatings during ageing, preserving the samples' hydrophobicity. After ageing, compared with RTV-SiR, the composite samples exhibit a relatively smaller increase in leakage current and maintain higher electrical strength. According to FTIR analysis, the loss rates of several important absorption peak intensities of RTV-SiR are higher during ageing, and almost none of them can be restored, whereas those of the samples filled with SiO2/ATH demonstrate a loss-recovery characteristics. Additionally, compared with RTV-SiR, the SiO2/ATH-filled samples exhibit significantly lower reductions in tensile strength, elongation at break, and hardness after ageing treatment, indicating superior ageing resistance.
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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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