Abstract: Kevlar/epoxy composite laminates were prepared by molding process using halogen free flame retardant epoxy preg reinforced with para aramid fiber. The thickness, fiber volume fraction and mechanical properties of the composite laminates under different forming pressures were measured, the cross section of the samples under different forming pressures was characterized by metallographic microscope, and the flame retardancy of the laminates was tested. The results show that the thickness and fiber volume fraction of laminates do not change when the curing temperature (160 ℃) and the curing time (90 min) are constant and the curing pressure is 0.8 MPa. The thickness of the laminate and the volume content of the fiber basically no longer change, the interlayer bonding is tight, the comprehensive mechanical properties are optimal, and the molding quality is the best. The laminate has a limiting oxygen index of 44.57%, a vertical combustion rating of V-0, and excellent heat resistance and flame retardancy.

Key words: composites, compression molding, molding pressure, flame retardant, property