一种潜伏性无卤阻燃中温固化环氧树脂体系

选用双氰胺和UR500为固化体系,自制阻燃剂M,制备一种预浸料用潜伏性无卤阻燃中温固化环氧树脂体系。结果表明,该树脂体系室温下储存期超过30 d,固化后力学性能优良,拉伸性能可达66. 5MPa,弯曲强度可达133 MPa,冲击强度可达10. 7 kJ/m2,阻燃防火性能优异,氧指数高达33. 1%,垂直燃烧满足UL-V0级,且可离火自熄。扫描电镜和热分析的结果表明,该体系优异的阻燃性能主要源于其燃烧后所成碳层的隔热隔氧作用。

A Non-Halogen Flame-Retardant Latent Epoxy Resin System Curing at Medium Temperature

A new kind of epoxy resin used in prepreg was preprared by taking dicyandiamide as the curing agent,UR500 as the accelerator and M as the flame retardant.The room temperature storage of the resin was more than 30 days and the resin exhibited excellent mechanical properties.The tensile,flexural and impact strength are 66.5 MPa,133 MPa and 10.7 kJ/m².V-0 level is reached during the UL-94 vertical combustion and the limiting oxygen index(LOI) is 33.6%.The results reveal that the resin exhibits self-extinguish properties away from the fire due to the more dense carbon layer after burning by scanning electron microscope and thermogravimetric analysis.