▎ 摘　　要

NOVELTY - A polylactic acid material comprises 80-99 pts. wt. poly-L-lactic acid (PLLA), 1-20 pts. wt. poly-D-lactic acid (PDLA), 0.5-2 pts. wt. plasticizer, 0.2-1 pt. wt. antioxidant, 0.2-1 pt. wt. nucleating agent, 0.4-1 pt. wt. chain extender, and 0.01-0.1 pt. wt. graphene. USE - Polylactic acid material. ADVANTAGE - The polylactic acid material: has excellent heat resistance and simple preparation method; does not change the degradable characteristics of the raw material itself; and does not pollute the environment after manufacturing, using and discarding. The preparation method is suitable for industrial production, and inexpensive. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the polylactic acid material, which involves transferring the above-mentioned components to a feed mixer of a twin-screw extruder, mixing, entering to the twin screw extruder, extruding, then air-cooling and granulating, where PLLA and PDLA are dried before being mixed.