长亚甲基链段改性固化剂的制备与性能

采用二官能度环氧树脂对己二胺进行改性，得到了含多段长亚甲基链段的柔性固化剂。利用红外光谱表征其基本结构。采用环氧树脂E-44与之进行固化，通过不同温度下固化时间对力学强度影响的分析，初步确定其最佳固化条件为80 ℃，6 h。通过热重分析检测不同固化比例下固化产物的热稳定性，并采用差示扫描量热法研究该固化剂的固化动力学参数、反应活性、最佳固化温度及时间。对其固化物拉伸剪切强度进行测试，测试结果表明：在固化比例为1:0.5时，在-196 ℃、室温、60 ℃下的拉伸剪切强度分别为16.84，14.73和13.52 MPa，基本满足实际应用的需求。

Preparation and performance of curing agent modified with long methylene chains

A flexible curing agent containing a long methylene chain segment was synthesized by bis-functional epoxy resin modifying aliphatic amine. The structure of product was characterized by infrared spectroscopy. The epoxy resin E-44 cured with the flexible curing agent was researched. By analysis of the relationship between mechanical strength and temperature, the optimum curing condition was obtained preliminarily, which was 80 ℃, 6 h. The heat resistances of the cured products at different proportion were characterized by thermogravimetric analysis (TGA), and the dynamic parameters, reactivity, best curing temperature and time were studied by differential scanning calorimetry (DSC), the results verify the correctness of the previous work. At last, the tensile shear strength was studied, and the results show that the tensile shear strengths at -196 ℃ , room temperature and 60 ℃ are 16.84, 14.73 and 13.52 MPa respectively when the curing proportion is 1:0.5, which fully meets the practical requirements.