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采用非等温DSC法对自制的低粘度酚醛改性胺固化剂与环氧树脂的固化反应工艺参数进行了推导,并通过测试体系的固化度加以验证。固化物采用红外光谱进行了表征,同时测定了浇注体的力学性能、热性能(TG),并通过扫描电镜(SEM)对拉伸断裂面的表面形貌进行了观察。结果表明:环氧树脂E-51与自制固化剂的质量比为100∶35,固化工艺条件为常温/24 h+80℃/2 h时,体系力学性能最佳,拉伸强度55.2 MPa、弯曲强度92.8 MPa、压缩强度83.0 MPa,断裂伸长率2.2%,Tg达到280.3℃。该固化剂粘度低、耐热性好、具有很好的柔韧性,可用于建筑结构胶。
The non-isothermal DSC method was used to deduce the curing process parameters of self-made low viscosity phenolic modified amine curing agent and epoxy resin, and the curing degree of the system was verified. The cured material was characterized by FTIR spectroscopy. The mechanical properties and thermal properties (TG) of castings were also measured. The surface morphology of tensile fracture surfaces was observed by scanning electron microscopy (SEM). The results showed that the mechanical properties of epoxy resin E-51 were the best when the mass ratio of epoxy resin E-51 to self-made curing agent was 100:35 and the curing conditions were normal temperature / 24 h + 80 ℃ / 2 h, tensile strength 55.2 MPa, The strength of 92.8 MPa, the compressive strength of 83.0 MPa, the elongation at break of 2.2% and the Tg of 280.3 ° C. The curing agent has low viscosity, good heat resistance, good flexibility and can be used for building structural adhesives.