Power cables are a key element in the global energy internet and are vital to national security and economic development. Modified polypropylene insulating material with excellent comprehensive performance can act as a new-generation candidate to replace cross-linked polyethylene for the development of green power cables. In this work

the modified polypropylene insulating material via physically blending was used. The control of cooling temperature during extrusion was utilized to simulate the cooling process of polypropylene cable in the actual extrusion production process. As a result

the effects of cooling temperature on the size and distribution of elastomers

polypropylene crystallinity as well as mechanical and electrical properties were studied. When the cooling temperature is 80 ℃

the cooling rate is suitable for the formation of crystalline structure and phase morphology in the polypropylene insulation material

thus exhibiting better mechanical toughness and electrical properties

as well as superior overall performance. The work presented here provides an important reference for the processing and preparation of polypropylene insulated cables in the actual extrusion production process.