▎ 摘　　要

NOVELTY - A polyhydroxyalkanoate composite film comprises 5-15 pts. wt. graphene slurry, 5-25 pts. wt. n-butyl citrate, 100 pts. wt. polyhydroxyalkanoate matrix, 0.2-1 pt. wt. calcium stearate, 0.1-1 pt. wt. erucamide and 0.2-1 pt. wt. antioxidant. USE - Polyhydroxyalkanoate composite film is used as food packaging film and agricultural mulch film. ADVANTAGE - The polyhydroxyalkanoate composite film has low shrinkage rate, and excellent strength, tear resistance, dimensional stability, heat-dissipation property and biodegradability, and is prepared by a simple process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of polyhydroxyalkanoate composite film, which involves uniformly mixing graphene slurry, n-butyl citrate, polyhydroxyalkanoate matrix, calcium stearate, erucamide and antioxidant at 70-90 degrees C for 5-10 minutes, extruding, baking at 80-100 degrees C for 30-50 minutes, and drying.