室温硫化硅橡胶绝缘纳米复合材料憎水特性分析

Hydrophobic Characteristics Analysis of RTV-SR Insulating Nanocomposite

室温硫化硅橡胶(RTV-SR,简称RTV)在电气设备防污闪工作中起重要作用的原因在于其优异的憎水性和憎水迁移性,为研究污秽成分和环境因素对RTV憎水特性影响,分析了静态接触角测量影响因素。用恒定湿热试验箱和紫外老化箱模拟不同外界环境,对污秽成分、环境温度、相对湿度、迁移时间和紫外辐照时间与RTV憎水特性的关系进行了定量对比试验,借助接触角影像测试仪、扫描电镜(SEM)和傅立叶变换红外光谱(FTIR)仪对其影响机理进行了分析。结果表明,温度、盐密和灰密对RTV憎水迁移性有明显的影响,相对湿度和灰成分影响RTV憎水迁移速度及稳定后的静态接触角,长时间紫外预处理能加快RTV憎水迁移速度。研究结果可作为分析硅橡胶材料憎水性、憎水性迁移特性的参考,同时也为外绝缘材料憎水性试验标准的制定提供了试验依据。

RTV-SR were widely used in electrical equipment external insulation for antipollution flashover due to its excellent hydrophobicity and hydrophobicity transfer. In order to research the influence of contamination composition and environmental factors on RTV hydrophobic characteristics, influential factors of static contact angle measurement were analyzed. Constant humidity and temperature test chamber and ultraviolet aging equipment were used to imitate various external environments, the influences of contamination composition, environmental temperature, environmental humidity, migration time, and ultraviolet irradiation time on hydrophobic Characteristics of RTV were comparatively investigated by quantitative test, and the influencing mechanisms were analyzed by using contact angle image analysis equipment,SEM and FTIR instruments. The results indicate that, ambient temperature, salt density and non soluble deposit density have obvious effects on hydrophobic recovery characteristics of RTV, relative humidity and ash composition affect velocity of hydrophobicity transfer and migration stable contact angle, and the velocity of RTV hydrophobicity transfer are greatly increased by using long-time UV pretreatment.