▎ 摘　　要

NOVELTY - Heat-shrinkable tube comprises 10 to 40 pts. wt. polyethylene, 50 to 80 pts. wt. olefin-acrylate copolymer, 20 to 40 pts. wt. graphene, 3 to 8 pts. wt. phosphate-based flame retardant, 0.5 to 5 pts. wt. lubricant and 0.5 to 5 pts. wt. antioxidant. The graphene is monolayer graphene, bilayered graphene, less mixture of graphene, and multilayer graphene. USE - Heat-shrinkable tube for controlling electric stress (claimed). ADVANTAGE - Heat-shrinkable tube has ideal dielectric constant and volume resistivity, and is suitable for electric stress control protection of the power cable terminal and the intermediate connection of the voltage range is 10-25kV, has good flame retardant properties and good mechanical strength, does not contain mercury, cadmium, hexavalent chromium and other hazardous substances to meet the European union RoHS directive requirements, does not produce toxic substances and so is harmless to the environment and the human body. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing heat-shrinkable tube, which involves: (A) weighing the raw materials and mixing them uniformly to obtain a premix; (B) kneading premix on a twin-screw extruder equipped with an internal mixer and extruding on a single screw extruder to obtain a pipe; and (C) cross-linking tube at 150-170 kGy, heating to 2 to 4 times, and quenching to obtain heat-shrinkable tube.