The molecular weight distribution of polyethylene wax produced by polymerization is narrow, and the relative molecular mass can be controlled artificially, but it must be carried out on large installations with large investment. Domestic manufacturers generally use high molecular weight polyethylene to produce hot cracking. The raw materials used in this method can be polyethylene resin and polyethylene waste plastic. The former is made of high grade and the latter has low grade. High molecular weight polyethylene can be pyrolyze into low molecular weight polyethylene wax under the condition of isolation air. The properties of the polyethylene wax related to the structure, such as crystallinity, density, hardness and melting point, are affected by the cracking raw materials. Cracking process is divided into cracking kettle method and extrusion process. The cracking process is a batch processing method, which is suitable for manufacturers with low production capacity and small production capacity. The extrusion process is a continuous production, which is suitable for large production and high productivity enterprises.
Polyethylene wax can be prepared from recycled polyethylene solution. The raw materials of the technology are very rich and cheap, the process is relatively simple and the operation cost is low.