▎ 摘　　要

NOVELTY - An insulated chemically-crosslinked polyolefin sheathed power cable comprises a conductor, an insulation layer, a filling layer, a sheath layer (a) which is a crosslinked polyethylene composite material, and a sheath layer (b). The crosslinked polyethylene composite material is prepared by adding graphene oxide to a beaker, adding absolute ethanol, ultrasonically dispersing, adding an ultra-high-molecular weight polyethylene, ultrasonically dispersing, ball-milling, drying, transferring to a vulcanizer, pre-compressing, demolding, pressing to obtain a composite material, polishing a surface of the composite material, vacuum-sealing for gamma -ray irradiation treatment, placing the irradiated composite material in a beaker, adding 10% vitamin C solution, magnetically stirring and transferring to a vacuum-drying oven, soaking at 120 degrees C for 20 hours, taking out the composite material and removing vitamin C on the composite material. USE - Insulated chemically-crosslinked polyolefin sheathed power cable. ADVANTAGE - The low-smoke halogen-free flame-retardant insulated chemically-crosslinked polyolefin sheathed power cable has improved wear resistance. The linear structure of ultra-high-molecular weight polyethylene forms network structure, and the filled graphene oxide prevents vitamin C from diffusing into interior of the network structure, and a large amount of vitamin C exists on the surface of the crosslinked polyethylene composite material which acts as lubricating film, thereby reducing wear on the power cable. DETAILED DESCRIPTION - An insulated chemically-crosslinked polyolefin sheathed power cable comprises a conductor, an insulation layer, a filling layer, a sheath layer (a) which is a crosslinked polyethylene composite material, and a sheath layer (b). The outer surface of the conductor is covered with the insulation layer. The conductor and the insulation layer are compounded to form a cable core, and several cable cores are installed inside the layer (a), and filling layer is filled between the cable core and the layer (a). The outer surface of the layer (a) is compounded with the layer (b). The crosslinked polyethylene composite material is prepared by adding graphene oxide to a beaker, adding absolute ethanol, ultrasonically dispersing for 30-45 minutes, adding an ultra-high-molecular weight polyethylene, ultrasonically dispersing for 30-45 minutes to obtain a mixture, adding the mixture to a ball mill, ball-milling at 400-450 rpm for 2 hours, transferring to a beaker, drying the powder at 60-65 degrees C, transferring to a vulcanizer, pre-compressing at a pressure of 5 MPa for 10 minutes, demolding, maintaining at 200 degrees C for 2 hours, pressing at a pressure of 10 MPa for 30 minutes to obtain a composite material, polishing a surface of the composite material, vacuum-sealing for gamma -ray irradiation treatment, placing the irradiated composite material in a beaker, adding 10% vitamin C solution, magnetically stirring and transferring to a vacuum-drying oven, soaking at 80 degrees C for 2 hours, soaking at 100 degrees C for 4 hours, soaking at 120 degrees C for 20 hours, taking out the composite material and removing vitamin C on the surface of the composite material.