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Thermal Decomposition Properties of Epoxy Resin in SF6/N2 Mixture

机译：SF6 / N2混合物中环氧树脂的热分解性能

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摘要

As a promising alternative for pure SF6, the mixture of SF6/N2 appears to be more economic and environment-friendly on the premise of maintaining similar dielectric properties with pure SF6. But less attention has been paid to the thermal properties of an SF6/N2 mixture, especially with insulation materials overheating happening simultaneously. In this paper, thermal decomposition properties of epoxy resin in SF6/N2 mixture with different SF6 volume rates were studied, and the concentrations of characteristic decomposition components were detected based on concentrations change of some characteristic gas components such as CO2, SO2, H2S, SOF2, and CF4. The results showed that thermal properties of 20% SF6/N2 (volume fraction of SF6 is 20%) mixture has faster degradation than 40% SF6/N2 mixture. As ratio of SF6 content decreases, thermal stability of the system decreases, and the decomposition process of SF6 is exacerbated. Moreover, a mathematical model was established to determine happening of partial overheating faults on the epoxy resin surface in SF6/N2 mixture. Also thermal decomposition process of epoxy resin was simulated by the ReaxFF force field to reveal basic chemical reactions in terms of bond-breaking order, which further verified that CO2 and H2O produced during thermal decomposition of epoxy resin can intensify degradation of SF6 dielectric property.
机译：作为纯SF6的有希望的替代品，在保持与纯SF6相似的介电性能的前提下，SF6 / N2的混合物似乎更加经济和环境友好。但是，对SF6 / N2混合物的热性能的关注较少，特别是在绝缘材料同时发生过热的情况下。本文研究了不同SF6体积比的SF6 / N2混合物中环氧树脂的热分解特性，并根据CO2，SO2，H2S，SOF2等某些特征气体组分的浓度变化来检测特征分解组分的浓度。和CF4。结果表明，20％SF6 / N2（SF 6 的体积分数为20％）混合物的热性能比40％SF 6 / N 的混合物具有更快的降解速度。 2 混合物。随着SF 6 含量比例的降低，体系的热稳定性下降，SF 6 的分解过程加剧。建立了确定SF 6 / N 2 混合物中环氧树脂表面局部过热故障的数学模型。通过ReaxFF力场对环氧树脂的热分解过程进行了模拟，揭示了键断裂顺序的基本化学反应，进一步验证了CO 2 和H 2 环氧树脂热分解过程中产生的O会加剧SF 6 介电性能的下降。

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