生物质腰果酚基环氧树脂体系固化工艺及性能

Curing Process and Properties of Biomass Cardanol-based Epoxy Resin System

以生物质腰果酚缩水甘油醚为稀释剂,与环氧树脂以不同质量比共混,再与腰果酚改性聚酰胺固化剂进行交联固化反应,通过黏度测试、傅立叶变换红外光谱分析、力学性能测试和扫描电子显微镜分析,考察了稀释剂用量对环氧树脂固化物结构及性能的影响,确定了最佳配方和固化工艺。研究表明,稀释剂对环氧树脂有显著的稀释作用,同时也具有较好的增强增韧作用,可提高固化物的力学性能,当稀释剂的加入量为稀释剂和环氧树脂质量总和的15%,稀释剂和环氧树脂混合质量与固化剂质量之比为100∶80时,25℃固化12 h,80℃固化6 h,固化物的拉伸强度为66.05 MPa,断裂伸长率为2.94%,拉伸弹性模量为3.77 GPa,冲击强度为38.43 kJ/m2,可作为高性能复合材料基体。SEM分析发现,加入稀释剂后的固化物断面呈微观相分离的“海岛”结构,属于韧性断裂特征。

The blends of the biomass cardanol glycidyl ether diluent and epoxy resin at different mass ratios were cured with cardanol modified polyamide curing agent.The influences of the cardanol glycidyl ether content on the structure and properties of the cured epoxy resins were investigated by the viscosity test,Fourier transform infrared spectroscopy analysis,mechanical performance test and scanning electron microscopy(SEM)analysis,while the optimum formulation and curing process were determined.The results show that the diluent has a significant dilution effect on the epoxy resin,and also has a good strengthening and toughening effect,which can improve the mechanical properties of the cured epoxy resin.When the addition amount of diluent is 15%of the total mass of diluent and epoxy resin,and the mass ratio of diluent and epoxy resin mixed mass to curing agent is 100∶80,curing at 25℃for 12 h and at 80℃for 6 h,the tensile strength,elongation at break,bending modulus of elasticity and impact strength of the cured product are 66.05 MPa,2.94%,3.77 GPa and 38.43 kJ/m2,respectively,it can be used as a high-performance composite matrix.SEM analysis shows that the cross-section of the cured product after adding diluent is a micro phase separation sea-island structure,which belongs to ductile fracture characteristics.