Preparation method of environment-friendly composite engineering plastic

The invention discloses a preparation method of environment-friendly composite engineering plastic. A regenerative polyvinyl chloride material, diallyl phthalate and a polyvinyl acid ester elastomer are adopted to prepare a composite engineering plastic master batch which has very good impact toughness and lowered cost; high-dispersion nanometer calcium carbonate has good dispersibility and compatibility with the composite engineering plastic master batch, so that the fluidity and the processability of the composite engineering plastic master batch are improved, the engineering plastic is endowed with better physical mechanical properties, and the toughness of the engineering plastic is further improved; flame retardant materials including graphene, titanium dioxide and a halloysite nano-tube and anti-ageing materials including wollastonite needle-shaped fibers in a modified anti-ageing flame retardant system form a composite synergistic effect, and the flame retardancy and the anti-ageing performance of the