Waste crosslinked polyethylene recovered material and recovery method thereof

The invention discloses a waste crosslinked polyethylene recovered material and a recovery method thereof. The waste crosslinked polyethylene recovered material comprises the following steps of crushing waste crosslinked polyethylene to obtain particles with sizes of 0.5-2cm, and grinding the particles by a solid-state mechanochemical reactor to obtain powder of 100-500 meshes, wherein in grinding, a cooling cycle water temperature is controlled in a range of 5-30 DEG C, grinding pressure is controlled in a range of 10-50MPa, a grinding rotation rate is controlled in a range of 10-1000rpm and grinding frequency is 5-30. A Soxhlet extraction device test result shows that the powder has gel content less than 60%. The recovery method can selectively cut out C-O bonds and Si-O bonds in waste crosslinked polyethylene, cut out cross bonds of a three dimensional crosslinking structure, change the original insoluble and non-melting characteristic, improve material thermoplastic and fusion fluidity, and provides thermoplastic processability for the waste crosslinked polyethylene recovered material. The waste crosslinked polyethylene recovered material can be processed to form high-value recovered materials and products with excellent performances by conventional thermoplastic processing processes such as extrusion and rolling.