▎ 摘　　要

NOVELTY - Flame-retardant composite material comprises a magnesium hydroxide/graphene oxide hybrid material and polypropylene mixed with each other. USE - As flame-retardant composite material. ADVANTAGE - The composite material has excellent heat-conducting property and flame-retardant property, adopts simple preparation method, is cost-effective and can be well applied in industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the composite material involving (i) adding a soluble divalent magnesium salt to a graphene oxide solution to obtain a mixed solution, (ii) adding alkali to the mixed solution and reacting to obtain a mixed slurry, (iii) performing a solid-liquid separation of the mixing slurry to obtain the magnesium hydroxide/graphene oxide hybrid material in a solid phase and (iv) adding the magnesium hydroxide/graphene oxide hybrid material to polypropylene to prepare the composite material.