The promotion of heat-resistant polyethylene (PE-RT) pipes in my country shows that many people do not have a deep understanding of this product. Therefore, it is necessary to further introduce and analyze the concept, characteristics and related knowledge of this product.
The concept of heat-resistant polyethylene (PE-RT)：
The special material for heat-resistant polyethylene (PE-RT) pipes was first introduced by the Dow Chemical Company of the United States in March 2002, under the brand name DOWLE9X2344E9LLDPE. This raw material is a medium-density polyethylene with stable properties, which is made by copolymerization of ethylene monomer and octene monomer. The raw material has excellent heat resistance and long-term hydrostatic performance.
When the PE-RT material is under stress under high temperature and high pressure, C8 molecules absorb part of the energy during the stretching process, which can prevent the crystal lattice from being damaged. Through reasonable design, the C8 monomer can be evenly distributed inside the polymer molecule, so that the polymer is uniformly stressed, and by controlling its quantity, its thermal stability and long-term hydrostatic performance can be improved.
In the early stage of PE-RT material development, Dow Chemical Company first developed the DOW2344E pipe special material, and then developed the DOW2388 pipe special material. Among them, the performance of 2388 pipe special material is better than that of 2344E pipe special material. Due to the continuous expansion of the PE-RT pipe market, many petrochemical companies in the world have also developed their own grades of special PE-RT pipe materials, such as the YUCLAIRDX800 PE-RT pipe special material developed by SK Chemical Company, and LG Chemical Company developed The special materials for SP980 pipes, the special materials for 4731B pipes developed by Basell, and the special materials for XP9000 pipes developed by Korea Dalin Company.
With the advancement of polymer polymerization technology, the current PE-RT material has been developed from the copolymerization of ethylene and octene to the copolymerization of ethylene and hexene, ethylene and butene, thus expanding the pipeline manufacturer’s Choose a space.
With the large-scale application of low-temperature floor radiant heating ("floor heating") systems, floor heating pipe manufacturers have increased their investment in floor heating pipes. At present, the commonly used pipes in floor heating systems include PE-X pipes, PE-RT pipes, PB pipes, etc. Because PE-RT pipe has the advantages of strong repairability, good construction flexibility, good recyclability, good environmental protection, and low price, it has developed rapidly in recent years.
