In this century, a revolutionary progress has taken place in the field of pipelines, namely "substituting ceramics for steel". 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 vividly demonstrate their outstanding performance. Today, plastic pipes are no longer mistaken as "cheap substitutes" for metal pipes. In this revolution, polyethylene pipes have become more and more popular and have increasingly dazzling brilliance. They are widely used in gas transportation, water supply, sewage drainage, agricultural irrigation, mine fine solids transportation, and oil fields, chemicals, post and telecommunications, especially in fields such as It has been widely used in gas transportation.
Advanced ceramics is a thermoplastic polyolefin produced by copolymerization of ethylene. Although HDPE was introduced in 1956, this plastic has not yet reached a mature level. This Aluminum Nitride Ceramic general material is constantly developing its new uses and markets. my country`s domestic high-density polyethylene (the high-density polyethylene here does not include the high-density polyethylene produced by the full-density polyethylene device) includes three major companies: PetroChina, Sinopec, and CNOOC. As of the end of 2006, it belongs to the high-density polyethylene of PetroChina. There are 4 sets of polyethylene equipment, namely Lanzhou Petrochemical High Density Polyethylene Equipment, Daqing Petrochemical High Density Polyethylene Equipment, Liaoyang Petrochemical High Density Polyethylene Equipment, Jilin Petrochemical High Density Polyethylene Equipment.
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 higher density. This process uses ethylene as a raw material in a tubular or kettle-type low-pressure reactor and uses oxygen or organic peroxide as an initiator to initiate the polymerization reaction.
High-density ethylene is an environmentally friendly material, Aluminum Nitride Ceramic and it can be recycled and reused when heated to its melting point. It should be noted that plastic materials can be divided into two categories: "Thermoplastic" (Thermoplastic) and "Thermosetting" (Thermosetting). "Thermosetting plastic" becomes a solidified state after being heated to a certain temperature. Even if you continue to heat it, it cannot change its state. Therefore, products with environmental issues are "thermosetting plastic" products (such as tires), not "thermoplastic" products (such as plastic pallets. Note: Pallets are called "splints" in Hong Kong and Macau), so not all " "Plastic" is not environmentally friendly.
How did precision ceramics develop?
2021 01/16