目的 针对目前高空电力作业车绝缘臂所用胺类及酚醛胺类固化树脂存在内应力大、易产生缺陷、工艺窗口窄等问题,导致构件长期耐久性不足,制约其在高压高强度环境下可靠应用的情况,本研究旨在系统探究一种适用于高性能绝缘臂的树脂体系,并深入研究其固化过程与玻璃化转变温度（Tg）,以提升材料的综合性能与可靠性。方法 采用差示扫描量热法（DSC）获取树脂体系在不同升温速率下的固化放热数据,推导得到优化的阶梯式理论固化工艺温度参数。运用唯象模型法建立该树脂的固化动力学方程,并利用120 ℃等温DSC实验数据对模型进行验证。基于DiBenedetto方程,构建了树脂体系玻璃化转变温度与固化度之间的关联数学模型。结果 研究确定了该树脂体系优化的理论固化工艺参数,固化动力学模型与实验数据吻合良好,验证了模型的可靠性。通过模型建立了固化度与玻璃化转变温度之间的定量关系。经后固化处理后,树脂的玻璃化转变温度提高至128 ℃,表明后固化工艺有效促进了树脂交联网络的形成,显著增强了其固化交联密度。结论 系统建立了一种适用于高性能绝缘臂的树脂体系的固化动力学模型及玻璃化转变温度预测模型,为工艺优化提供了理论依据。结果表明,通过合理的后固化处理可显著提升树脂的玻璃化转变温度与交联密度,有助于改善绝缘臂的长期耐久性,为其在高电压、高强度作业环境下的可靠应用提供了固化工艺参数的确定依据。
Abstract
Since the current amine and phenolic amine curing systems used in insulated booms suffer from high internal stress, defect susceptibility, and a narrow processing window, leading to reduced long term durability and limiting reliable application in high voltage and high strength environments, the work aims to systematically investigate a resin system suitable for high performance insulated booms and conduct in-depth analysis on its curing process and glass transition temperature (Tg), to improve the comprehensive performance and reliability of the material. Differential scanning calorimetry (DSC) was used to obtain curing exotherm data at different heating rates, based on which the optimized theoretical curing temperature profile and curing temperature parameters were derived. A phenomenological model was employed to establish the curing kinetic equation and verified with isothermal DSC data at 120 ℃. Based on the DiBenedetto equation, a mathematical model linking the glass transition temperature and the degree of cure was developed. The optimized theoretical curing process parameters of the resin system were determined. The curing kinetic model agreed well with experimental data, which verified the reliability of the model. A quantitative relationship between the degree of cure and the glass transition temperature was established based on the model. After post curing, the resin's Tg increased to 128 ℃, indicating that post curing effectively promoted the formation of a cross linked network and significantly enhanced the cross linking density. A curing kinetic model and a glass transition temperature prediction model for the resin system suitable for high-performance insulated booms are systematically established, providing a theoretical basis for process optimization. The results show that appropriate post curing treatment can significantly increase the glass transition temperature and crosslink density of the resin, which helps improve the long-term durability of insulated booms and offers guidelines for determining curing process parameters for their reliable application under high voltage and high strength operating conditions.
关键词
绝缘斗臂车 /
环氧树脂 /
DSC测试 /
固化温度 /
玻璃化转变温度
Key words
insulated bucket truck /
epoxy resin /
DSC test /
curing temperature /
glass transition temperature
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基金
湖北省随州市产业关键技术核心攻关后补助项目; 湖北省随州创新发展联合基金（JCZRLH202601981）
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