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树脂固化不完全与开裂是浸渍制品的两个主要质量问题。 本文在探讨树脂固化机理的基础上,用红外光谱追踪不同温度、不同时间环氧基的吸收峰变化,得到了环氧基的转化率随温度、时间变化的曲线。以环氧基的转化率作为固化度,以此建立了红外光谱测环氧树脂固化程度的方法。由此,得到了树脂完全固化所需的温度和时间。对等当量配比与固化剂不足之配比在固化速度与固化程度上进行了对比。 我们又在分析开裂原因的基础上,用热分析配合红外光谱找出环氧—酚醛体系固化过程的反应温度区及反应速度最快的温度点。提出了能防止产生破坏性内应力的升温程序和固化工艺。
Incomplete cure and cracking of the resin are two major quality issues with impregnated articles. In this paper, based on the mechanism of resin curing, infrared spectra were used to trace the changes of the absorption peaks of epoxy groups at different temperatures and different times. The curves of epoxy conversion with temperature and time were obtained. Based on the conversion of epoxy groups as curing degree, a method of measuring the curing degree of epoxy resin by infrared spectroscopy was established. Thus, the temperature and time required for complete cure of the resin were obtained. Equivalent equivalent ratio and the lack of curing agent in the curing speed and curing degree were compared. Based on the analysis of the cause of cracking, we used thermal analysis and infrared spectroscopy to find out the reaction temperature zone and the fastest reaction temperature point of the epoxy-phenolic system. Proposed to prevent the destructive internal stress of the heating process and curing process.