A brief history of the development of high-density polyethylene

This century has seen a revolutionary progress in the field of pipes, 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 as "cheap substitutes" for metal pipes. In this revolution, polyethylene pipes are favored and increasingly dazzling. They 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 fields such as It is widely used in gas transportation.
HDPE is a thermoplastic polyolefin produced by the copolymerization of ethylene. Although HDPE was introduced in 1956, this plastic has not yet reached maturity. This versatile material continues to develop new uses and markets.
my country's domestic manufacturers of high-density polyethylene (the high-density polyethylene here does not include high-density polyethylene produced by full-density polyethylene units) include PetroChina, Sinopec, and CNOOC. As of the end of 2006, the high-density polyethylene belonging to PetroChina 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, and Jilin Petrochemical high-density polyethylene plant.
High-density polyethylene is usually manufactured using the Ziegler-Natta polymerization method. It is characterized by the fact that there are no branches on the molecular chain, so the molecular chains are regularly arranged and have a high density. This process uses ethylene as the raw material in a tubular or kettle low-pressure reactor, and uses oxygen or organic peroxide as the initiator to initiate the polymerization reaction.
High-density vinyl is an environmentally friendly material that can be recycled and reused when heated to its melting point. It should be noted that plastic raw materials can be divided into two categories: "Thermoplastic" and "Thermosetting plastic". "Thermosetting plastic" becomes a solidified state after being heated to a certain temperature, and its state cannot be changed even if it is continued to be heated. Therefore, products with environmental problems are "thermosetting plastic" products (such as tires), not "thermoplastic plastic" products (such as plastic pallets Note: pallets are called "plywood" in Hong Kong and Macao), so not all " "Plastic" is not environmentally friendly.