Abstract
From the perspective of improving the thermodynamic properties of epoxy resin, it has become the focus of research to enhance the operational stability of GIS (Gas Insulated Substation) basin insulators for UHV (Ultra-High Voltage) equipment. In this paper, three aminosilane coupling agents with different chain lengths, (3-Aminopropyl)trimethoxysilane (KH550), Aminoethyl)-γ-aminopropyltrimethoxysilane (KH792) and 3-[2-(2-Aminoethylamino)ethylamino]propyl-trimethoxysilane (TAPS), were used to modify nano-SiO2 and doped into epoxy resin, respectively, using a combination of experimental and molecular dynamics simulations. The experimental results showed that the surface-grafted KH792 model of nano-SiO2 exhibited the most significant improvement in thermal properties compared with the undoped nanoparticle model. The storage modulus increased by 276 MPa and the Tg increased by 61 K. The simulation results also showed that the mechanical properties of the nano-SiO2 surface-grafted KH792 model were about 3 times higher than that of the undoped nanoparticle model, the Tg increased by 36.5 K, and the thermal conductivity increased by 24.5%.
Highlights
In recent years, the national UHV power grid project has developed rapidly
This study combined experimental and molecular dynamics simulations to study the thermal properties of epoxy resin of silica nanoparticles modified with three silane coupling agents, KH550, KH792, and TAPS
The conclusions are as follows: The doped silane coupling agent-modified silica nanoparticles can effectively improve the thermal properties of epoxy resin, as well as the storage modulus, mechanical properties, glass transition temperature, and thermal conductivity of epoxy resin
Summary
The GIS is an important piece of equipment for ensuring the safe and stable operation of a UHV power grid [1]. As key equipment in the GIS, the properties of basin insulators have an important impact on the safe and stable operation of high-voltage insulation equipment [2]. As the main raw material of basin insulators, is easy to be processed. It is low cost and has good corrosion resistance and electrical insulation properties [3]. With the booming development of high-voltage technology, the voltage level is getting higher and higher, so the requirements for the properties of voltage equipment are getting higher and higher. Improving the thermal properties of epoxy resin is of great significance for the stable operation and practical application of basin insulators
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