水分侵入对现场老化硅橡胶性能影响的研究

Effect of water ingress into on-site aged silicone rubber on its properties

硅橡胶复合绝缘子在高湿环境中长期运行后表面会发生粉化现象。为研究水分侵入对已自然老化的硅橡胶性能的影响,本文以在南方沿海某地运行超10年的复合绝缘子伞裙为研究对象,对去除粉化层的硅橡胶样品开展去离子水浸泡试验,研究水分侵入样品后硅橡胶的质量和理化特性的变化,探讨水分侵入对硅橡胶二次粉化现象的影响。结果表明:去除粉化层后的硅橡胶伞裙样品在去离子水浸泡后可产生新的粉化层,其微观形貌和理化特性与自然形成的粉化层相似;通过改变试验的水温,明确了水分是已老化硅橡胶表面再次发生粉化现象的主要因素,且高温可加速粉化层的产生。

Silicone rubber composite insulators would produce powders on their surface after long-term operation in high humidity environment.In order to study the effect of water ingress into on-site aged silicone rubber on its properties,we used the composite insulator sheds which have operated over ten years in the southern coastal areas as research object.Deionized water immersion tests were conducted on the silicone rubber samples which have been removed their chalking layers to study the effect of water ingress into samples on their mass and physicochemical properties,and the influence of water ingress on the secondary chalking phenomenon of the silicone rubber was discussed.The results show that the silicone rubber samples which have removed their chalking layers could generate new chalking layers after deionized water immersion,whose microstructures and physicochemical properties were close to the naturally formed chalking layers.It is determined that water is the main influence factor which aged silicone rubbers produce powders on their surface again by changing the water temperature of tests,and high temperature can accelerate the generation of chalking layers.