硅烷偶联剂改性绝缘纸抗老化性能的研究

Study on ageing resistance of silane coupling agent modified insulating paper

为提升油浸式变压器中绝缘纸的抗老化性能,选取3种常见硅烷偶联剂作为改性剂,通过浸泡的方式对绝缘纸进行改性,然后将所得样品在130℃下进行35天的油纸联合热老化试验,定期取样测量绝缘纸的抗张强度、介电常数和击穿电压。结果表明:3种硅烷偶联剂均能提升绝缘纸的抗老化性能,其中经3-氨基丙基-三乙氧基硅烷改性的绝缘纸在热老化过程中几乎保持了原本纤维素的三维网状结构,具有最高的机械强度、介电性能和抗击穿能力。

In order to improve the ageing resistance of insulating paper in oil-immersed transformer,three kinds of common silane coupling agents were selected to modify the insulating papers by immersing.The obtained samples were subjected to the combined thermal ageing test of oil paper at 130℃for 35 days,and the tensile strength,permittivity,and breakdown voltage of the insulating papers were measured periodically.The results show that all the three kinds of silane coupling agents can improve the ageing resistance of insulating paper,the insulating paper modified by 3-aminopropyltriethoxysilane almost maintains the original three-dimensional network structure of cellulose during the thermal ageing process,and it exhibits the optimal mechanical strength,dielectric properties,and breakdown resistance.