The present invention is obtained by mixing and sonicating the synthesized surface-modified graphene oxide and nanodiamond in ethanol to obtain a stable dispersion, reacted at 60 ° C and filtered to prepare a graphene oxide / nanodiamond composites and then epoxy and curing agent To provide an epoxy composite material with enhanced mechanical strength by mixing with More specifically, (1) oxidizing graphite using a strong acid and an oxidizing agent to synthesize graphene oxide; (2) modifying the surface of the prepared graphene oxide; (3) modifying the surface of the nanodiamond; (4) preparing a graphene oxide composite filler to which nanodiamond nanoclusters are introduced by mixing the prepared surface-modified graphene oxide and nanodiamond; (5) a method for producing an epoxy composite material reinforced with graphene oxide introduced with the nanodiamond nanocluster introduced by mixing the graphene oxide composite filler prepared with the nanodiamond nanocluster prepared above and an epoxy and a curing agent. According to the present invention as described above, by using GN as a filler to add to the epoxy resin, to provide an epoxy composite material with improved mechanical properties even with a small amount of GN filler compared to the epoxy composite reinforced with conventional graphene oxide It works.
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