This paper shows a novel approach to reduce the aging of silicone elastomers for outdoor insulators by using different filler surface treatments and inert fillers such as barium sulphate (BaSO4). Silicone rubber composite insulators are used in overhead transmission lines (OHTL) since many years, however under specific environmental conditions, they can show a reduction of mechanical properties, embrittlement and the formation of superficial cracks. Besides other factors, these aging effects can be attributed to strong acids, which can be generated by high electrical field stresses and acidic pollution on the insulator surface. In this study, silicone elastomers used for outdoor insulation, were equipped with aluminum hydroxide with various surface treatments and inert fillers, which provokes a significant improvement of aging performance. Silicone elastomer compounds equipped with barium sulphate show improved aging resistance under acidic environment, like a reduced mass loss when immersed in concentrated nitric acid, decreased crack formation and enhanced stability of mechanical properties with comparable erosion resistance.

中文翻译：

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使用惰性填料提高有机硅弹性体的酸稳定性

本文展示了一种通过使用不同的填料表面处理和惰性填料（如硫酸钡 (BaSO4)）来减少户外绝缘子用有机硅弹性体老化的新方法。硅橡胶复合绝缘子在架空输电线路（OHTL）中使用多年，但在特定的环境条件下，它们会表现出机械性能下降、脆化和表面裂纹的形成。除了其他因素外，这些老化效应还可归因于强酸，强酸可由高电场应力和绝缘体表面的酸性污染产生。在这项研究中，用于户外绝缘的有机硅弹性体配备有各种表面处理的氢氧化铝和惰性填料，这引起了老化性能的显着改善。