What is high-density polyethylene
Release Time：
2024-06-18
Source：
High-density polyethylene (HDPE), which is a white powder or granular product. Non-toxic, tasteless, crystallinity of 80%~90%, softening point of 125~135 °C, service temperature up to 100 °C; Hardness, tensile strength and creep are better than those of low-density polyethylene; Good wear resistance, electrical insulation, toughness and cold resistance; Good chemical stability, insoluble in any organic solvent at room temperature, resistant to acid, alkali and corrosion of various salts; The film has low permeability to water vapor and air, and low water absorption; 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 shortcoming. The heat deflection temperature of high-density polyethylene film is low under stress, so attention should be paid to it when applying.
A brief history of development
This century has seen a revolutionary advance in the field of pipelines, namely "replacing steel with plastic". With the rapid progress of polymer material science and technology, the deepening of the development and utilization of plastic pipes, and the continuous improvement of production processes, plastic pipes have vividly demonstrated their excellent performance. Today, plastic pipes are no longer mistaken for a "cheap substitute" for metal pipes. In this revolution, polyethylene pipelines are favored and increasingly emitted dazzling brilliance, and are widely used in gas transportation, water supply, sewage discharge, agricultural irrigation, fine particle solid transportation in mines, as well as oil fields, chemical industry, post and telecommunications and other fields, especially in gas transportation has been widely used.
HDPE is a thermoplastic polyolefin produced from ethylene copolymerization. Although HDPE was introduced in 1956, the plastic had not yet reached a mature level. This versatile material is constantly being developed for new uses and markets.
China's domestic high-density polyethylene (where high-density polyethylene does not include high-density polyethylene produced by full-density polyethylene plant) manufacturers of PetroChina, Sinopec, CNOOC three major enterprises, as of the end of 2006, belonging to PetroChina high-density polyethylene plant has 4 sets, 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 using the Ziegler-Natta polymerization method, which is characterized by the absence of branching links on the molecular chains, so the molecular chains are arranged in a regular manner and have a high density. In this process, ethylene is used as raw material in a tubular or kettle low-pressure reactor to initiate a polymerization reaction with oxygen or organic peroxide as an initiator.
High-density ethylene is an environmentally friendly material, and when heated to the melting point, it can be recycled and reused. It should be known that plastic raw materials can be divided into two categories: "thermoplastic" (Thermoplastic) and "thermosetting plastic" (Thermosetting), "thermosetting plastic" is heated to a certain temperature and becomes a cured state, even if it continues to heat can not change its state, therefore, products with environmental problems are "thermosetting plastic" products (such as tires), not "thermoplastic" products (such as plastic pallet Note: pallet is called "plywood" in Hong Kong and Macau), So not all "plastics" are not environmentally friendly.
Related Information
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