一种潜伏性无卤阻燃中温固化环氧树脂体系

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

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 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 are66. 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.