High-density polyethylene (HDPE), white powder or granular product. Non-toxic, tasteless, crystallinity is 80%~90%, softening point is 125~135℃, and the service temperature can reach 100℃; hardness, tensile strength and creep are better than low density polyethylene; wear resistance, electrical Good insulation, toughness and cold resistance; good chemical stability, insoluble in any organic solvent at room temperature, corrosion resistance of acid, alkali and various salts; thin film permeability to water vapor and air, water absorption Low; poor aging resistance, environmental stress cracking resistance is not as good as low density polyethylene, especially thermal oxidation will reduce its performance, so antioxidants and ultraviolet absorbers must be added to the resin to improve this deficiency. High-density polyethylene film has a low heat distortion temperature under stress, so pay attention to it when applying it.
HDPE is a thermoplastic polyolefin produced by the copolymerization of ethylene. Although HDPE was introduced in 1956, the plastic has not yet reached maturity. This versatile material is constantly being developed for new uses and markets.
my country's domestic high-density polyethylene (high-density polyethylene here does not include high-density polyethylene produced by full-density polyethylene equipment) manufacturers include PetroChina, Sinopec, and CNOOC. As of the end of 2006, it belongs to PetroChina's high-density polyethylene. There are 4 sets of polyethylene plants, namely Lanzhou Petrochemical High Density Polyethylene Plant, Daqing Petrochemical High Density Polyethylene Plant, Liaoyang Petrochemical High Density Polyethylene Plant, Jilin Petrochemical High Density Polyethylene Plant.
High-density polyethylene is usually manufactured by Ziegler-Natta polymerization method, which is characterized by no branches on the molecular chain, so the molecular chain is arranged regularly and has a high density. In this process, ethylene is used as raw material in a tubular or tank-type low-pressure reactor, and the polymerization reaction is initiated with oxygen or organic peroxide as an initiator.