Patent ID: 8691913

Claim:
A method of preparing a polylactic acid material comprising the steps of: melting and extruding the polylactic acid composition at a temperature ranging from about 140° C. to about 200° C. to form an extruded polylactic acid composition, the polyactic acid material comprising a polymer matrix and a compatibilizer, wherein the polymer matrix includes at least one polylactic acid and at least one acrylonitrile-butadiene-styrene; wherein the compatibilizer is at least one compound selected from the group consisting of: a poly (styrene-ethylene-butadiene-styrene) copolymer grafted with maleic anhydrides; an acrylonitrile-butadiene-styrene copolymer grafted with maleic anhydrides; a polystyrene grafted with maleic anhydrides; and an ethylene-ethyl acrylate-glycidyl methacrylate; and then granulating and injection molding the extruded polylactic acid composition to form the polylactic acid material; and drying the polylactic acid material under a pressure ranging from about 0.04 MPa to about 0.08 MPa at a temperature ranging from about 30° C. to about 95° C.; then melting and extruding the polylactic acid material using a screw having a ratio of length to diameter ranging from about 20 to about 40, the screw having a rotating speed ranging from about 180 to about 230 r/min and under a temperature zone selected from the group consisting of: about 140° C. to about 160° C., about 140° C. to about 170° C., about 140° C. to about 180° C., about 150° C. to about 180° C., about 160° C. to about 180° C., about 170° C. to about 190° C., about 180° C. to about 195° C., about 180° C. to about 195° C., about 190° C. to about 200° C., about 195° C. to about 200° C., and each temperature zone operated under a vacuum degree ranging from about 0.02 MPa to about 0.06 MPa.