Study on the corona aging characteristics of KH570-modified nano-Al(OH)₃ cycloaliphatic epoxy resin in hygrothermal environments

IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Chemistry and Physics Pub Date : 2024-11-22 DOI:10.1016/j.matchemphys.2024.130190
Maoqiang Bi, Yingtai Du, Xiao Rao, Shaolan Lei, Xi Chen, Tianyan Jiang
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Abstract

Cycloaliphatic epoxy(CE) resin may experience insulation degradation and pose a threat to the safe operation of equipment when used in high-temperature and high-humidity environment. Therefore, to enhance the corona aging resistance of CE under harsh conditions, this study incorporated γ-methacryloxypropyltrimethoxysilane-modified (KH570) nano-Al(OH)₃ with varying content into the CE. The samples were subjected to corona aging tests under different hygrothermal conditions. The corona aging characteristics of CE in high-temperature and high-humidity environments were analyzed using scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR), resistivity, and dielectric loss measurements before and after modification. The results indicate that as humidity increases, the unmodified samples develop pores and cracks on the surface, which leads to an increased water absorption rate and internal hydrolysis. However, with the increase in filler content, the water absorption channels on the sample surface decrease, effectively suppressing chemical moisture absorption and maintaining the stability of the internal chemical structure. Among the various filler contents, the effect was most pronounced at 3%wtCE. Under 65 % RH conditions, the volume/surface resistivity increased by 27.28 % and 26.9 %, respectively, the leakage current decreased by 64.85 %, while the dry and wet breakdown voltages increased by 9.3 kV and 6.85 kV, respectively, and the dielectric loss variation with humidity was reduced. Compared to the unmodified material, KH570-modified nano-Al(OH)₃ has significantly improved the insulation and aging resistance properties of the material under hot and humid corona aging conditions. This study provides a reference for improving the performance of epoxy resins under high temperature, high humidity, and strong electric field conditions.
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kh570改性纳米al (OH)₃环脂肪族环氧树脂在湿热环境中的电晕老化特性研究
环脂肪族环氧树脂(Cycloaliphatic epoxy, CE)在高温高湿环境中使用时,其绝缘性会发生降解,对设备的安全运行构成威胁。因此,为了提高CE在恶劣条件下的耐电晕老化性能,本研究将不同含量的γ-甲基丙烯氧基丙基三甲氧基硅烷改性(KH570)纳米al (OH)₃加入CE中。在不同的湿热条件下对样品进行了电晕老化试验。采用扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)、电阻率和介电损耗测量等方法分析了改性前后CE在高温高湿环境中的电晕老化特性。结果表明:随着湿度的增加,未改性的样品表面出现孔隙和裂纹,导致吸水率和内部水解增加;但随着填料含量的增加,样品表面的吸水通道减少,有效抑制了化学吸湿,保持了内部化学结构的稳定性。在各种填料含量中,以3%wtCE的效果最为显著。在65% RH条件下,材料的体积/表面电阻率分别提高了27.28%和26.9%,泄漏电流降低了64.85%,干击穿电压和湿击穿电压分别提高了9.3 kV和6.85 kV,介质损耗随湿度的变化减小。与未改性的材料相比,kh570改性的纳米al (OH)₃在湿热电晕老化条件下,显著提高了材料的绝缘性能和耐老化性能。本研究为提高环氧树脂在高温、高湿、强电场条件下的性能提供了参考。
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来源期刊
Materials Chemistry and Physics
Materials Chemistry and Physics 工程技术-材料科学:综合
CiteScore
8.70
自引率
4.30%
发文量
1515
审稿时长
69 days
期刊介绍: Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.
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