纳米SiO_(2)改性玻璃纤维增强树脂的耐湿热老化性能

Hygrothermal ageing resistance of nano SiO_(2) modified glass fiber reinforced resin

高压电气设备中广泛使用的玻璃纤维增强树脂(GFRP)材料易在长期运行条件下受到湿热环境侵蚀导致绝缘劣化,影响电力系统的安全稳定运行。本文使用纳米SiO_(2)改性玻璃纤维,随后浸润环氧树脂制备了GFRP复合材料,并对其进行加速湿热老化处理,通过实验测试与仿真分析不同浓度纳米SiO_(2)对GFRP内部水分侵入和抗老化特性的影响。结果表明:当SiO_(2)质量分数为9.4%时,GFRP复合材料对水分侵入的抑制效果最好;同时SiO_(2)的加入可以使GFRP复合材料在老化前后都保持较高的表面绝缘性能。此外,结合仿真计算结果从分子尺度揭示了SiO_(2)对GFRP复合材料水分侵入的抑制作用及抗湿热老化特性的影响机制。

Glass fiber reinforced resin polymer(GFRP),which is widely used in high voltage electrical equipment,is easily to be eroded by hygrothermal environment under long-term operation conditions,resulting in insulation deterioration,which affects the safe and stable operation of power system.In this paper,glass fiber was modified by nano SiO_(2),and GFRP composites were synthesized by infiltrating epoxy resin.Accelerated hygrothermal ageing treatment was carried out on the composites,and the influence of different concentrations of nano SiO_(2) on water invasion and ageing resistance of GFRP was analyzed by experimental test and simulation.The results show that when the mass fraction of SiO_(2) is 9.4%,GFRP has the best inhibition effect on water intrusion.At the same time,the addition of SiO_(2) can make the GFRP composites maintain high surface insulation properties before and after ageing.In addition,combined with the simulation results,the inhibition effect of SiO_(2) on water intrusion of GFRP composites and the influence mechanism of hygrothermal ageing resistance of GFRP are revealed from the molecular scale.