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RTM用6818高温环氧树脂化学流变特性研究
龚文化1,杜姝婧1,许亚洪1
航天特种材料及工艺技术研究所,北京 100074
摘要:
以树脂传递模塑(RTM)用6818高温环氧树脂体系的化学流变特性研究为目的, 以差示扫描量热法(DSC)和黏度实验为基础,采用外推法初步确定了6818树脂体系的固化工艺制度。依据双阿累尼乌斯方程建立了树脂体系的化学流变模型,模型曲线与实验数据的吻合性良好。模型分析表明,在80~100 ℃内树脂体系黏度低于200 mPa·s的时间大于12 h,可以作为6818树脂比较理想的注胶温度。该模型能够反映6818树脂黏度变化规律,预报该树脂体系的RTM工艺窗口。
关键词:  环氧树脂  高温  树脂传递模塑工艺  流变特性
DOI:10.12044/j.issn.1007-2330.2019.06.008
分类号:TB332
基金项目:
Rheological Behavior of 6818 High Temperature Epoxy Resin for RTM
GONG Wenhua DU Shujing XU Yahong1
Aerospace Institute of Advanced Materials & Processing Technology,Beijing 100074
Abstract:
The rheological behavior of 6818 high temperature epoxy resin system for resin transfer molding process (RTM) was studied, according to the differential scanning calorimetry analysis (DSC) and viscosity experiments. The curing process of 6818 resin system was determined by extrapolation. A rheological model based on dual-Arrhenius equation was established. The curve tallied exactly with the experimental results. The results showed that the viscosity of the 6818 resin was under 200 mPa·s within the temperature range from 80℃ to 100℃, and the viscosity maintaining time more than 12 hours. The model could reflect the viscosity change of 6818 resin and predict the RTM process window of the resin system.
Key words:  Epoxy resin  Heat resistance  RTM  Rheological behavior