干燥环境下紫外辐射对硅橡胶老化性能的影响

Effect of UV Radiation on Aging Performance of HTV-silicone Rubber in Dry Conditions

随着中国"西电东送"及特高压输电工程的展开,复合绝缘子厂家纷纷研制出适合特高压输电工程线路应用的特高压等级的复合绝缘材料。笔者针对哈密至郑州±800 k V特高压直流输电工程在哈密段的复合绝缘子老化问题,提取哈密地区干燥强紫外辐射的气候特征,在干燥环境下对特高压等级的复合绝缘材料和普通电压等级的复合绝缘材料进行紫外加速老化实验。对实验样品进行静态接触角测试,硬度测试,傅里叶变换红外光谱(FTIR)分析。实验结果表明:两种试样硬度均变大,憎水性均部分丧失,并有填充物外露;红外光谱中Si-CH3键和Si-O-Si键的峰面积均减小;在两种试样初始数据相近的情况下,特高压等级样品各个数据的变化量均小于普通等级样品。

Focusing on the HTV-silicone rubber insulators aging problem of Hami section in the Hami-Zhengzhou ±800 k V UHV DC transmission project, the climatic characteristics of dry weather and strong UV radiation in Hami area were extracted, and UV-accelerated aging experiments for UHV level HTV-silicone rubber materials and normal voltage level HTV-silicone rubber materials were conducted in dry environment.Hardness measurement, static contact angle measurement, and Fourior transform infrared spectroscopy（FTIR）analysis were performed for the samples. Experimental results show that for both kinds of materials, the hardness increases, the hydrophobic property becomes weaker, the filler is partially bare, and FTIR peak areas of Si-CH3 and Si-O-Si become narrower. In the condition of similar initial data of the two kinds of samples, the data variations of UHV level samples are smaller than that of the normal level samples because the UHV level HTV-silicone rubber materials are optimized in formulation and manufacturing process and their UV aging resistance is superior to that of the normal voltage level ones in dry environment.