Room-temperature-vulcanized (RTV) silicone rubber coatings are widely used on outdoor insulators for their excellent anti-pollution flashover performance. However, under hot and humid climates, algal fouling severely deteriorates their surface insulation properties. In this study, a KH570-modified TiO2/RTV composite coating is developed to simultaneously enhance antifouling and electrical performance. The influence of nano-TiO2 particles on the photocatalytic algal inhibition and electrical insulation performance of the composite coatings is systematically studied using SEM, photocatalytic degradation tests, algal cell mortality measurements, resistivity and dielectric tests, flashover voltage determination, and leakage current analysis. The results show that after 8 hours of UV irradiation, the photocatalytic degradation rates of the pristine RTV, 1 wt% RTV, 3 wt% RTV, and 5 wt% RTV coatings reach 17.37%, 92.11%, 93.16%, and 96.22%, respectively. The incorporation of KH570-TiO₂ endows RTV with photocatalytic capability to inhibit algal growth, with the 5 wt% RTV sample achieving an algal cell mortality rate of 84.19% after 96 hours of cultivation under simulated natural environmental conditions. In addition, doping with KH570-TiO₂ enhances the electrical properties of RTV, with maximum increases in surface and volume resistivity of 8.36% and 15.64%, respectively. After simulated cultivation with green algae for 96 hours, the wet flashover voltage of the 5 wt% RTV sample increases by 8.1 kV compared with the pristine RTV. The findings provide a feasible strategy for integrating photocatalytic antifouling and insulation reinforcement in RTV coatings, addressing biological contamination and flashover degradation under humid conditions.
Yan Cheng,Feng Feng,Tianxue Zhu,Yanhui Zheng,Yukui Gou,Dapeng Yang,Jianying Huang,Yuekun Lai,Zhongyi Jiang
In recent years, the demand for transparent substrates (e.g. windows, mirrors and photovoltaic glass) with anti-fogging performances has increased, while conventional anti-fogging coatings, like single-component organic coatings (PVA, PAA, PAAm), show poor stability and cannot maintain their performance stably under harsh environments. In this work, KH570@TiO 2 plays the role of a bottom layer (KT coating) to increase roughness and binding, where the hydrolysis of KH570 anchors the substrate and provides active sites for the binding of the top coating, and the addition of the TiO 2 enhances UV shielding properties. A composite PVA-AAm-POSS-NH 2 gel (PAP coating) served as the top layer, which contains a large number of hydrophilic groups and thus endow the composite coating with satisfactory anti-fogging performance. The strong bonding force provided by the KT coating and the tight physical entanglement of the PAP coating endow the double-layer coating (PAPKT coating) stable anti-fogging performance (60 times of tape peeling test, 100 times of sandpaper friction test, and sand-punching test), and 48 s icing delay performance. The multi-performances make this work great potential in automotive glass as well as building facades to cope with complex situations.
危险品化学品经营许可证（带存储）