Introduction
Polyethylene pipe (PE pipe)
English name: Polyethylene
PE pipes are used in a wide range of fields. Among them, water supply pipes and gas pipes are the two largest application markets.
PE resin is polymerized from monomeric ethylene. Due to different polymerization conditions such as pressure and temperature during polymerization, resins of different densities can be obtained, and thus high density polyethylene, medium density polyethylene and low density poly are obtained. The fraction of ethylene. When processing different types of PE pipes, depending on the application conditions, the resin grades are selected differently, and the requirements for extruders and molds are also different.
Internationally, the material of polyethylene pipe is divided into five grades of PE32, PE40, PE63, PE80 and PE100, and the materials used for gas pipes and water supply pipes are mainly PE80 and PE100. China does not classify special materials for polyethylene pipes, which makes it difficult for domestic polyethylene gas pipes and water supply pipe manufacturers to select raw materials, and also brings hidden dangers to the use of polyethylene pipes.
Therefore, the National Bureau of Standards has made a large number of revisions in the new GB/T13663-2000 standard, which stipulates that PE80 and PE100 of different grades of water supply pipes have different pressure strengths, and the tensile strength performance of the old standard is removed, and the fracture is increased. Elongation (greater than 350%), which emphasizes basic toughness.
PE water supply pipe
PE pipe for water supply is a replacement for traditional steel pipe and PVC drinking water pipe.
The water supply pipe must withstand a certain pressure, usually a PE resin with a large molecular weight and good mechanical properties, such as HDPE resin. The LDPE resin has low tensile strength, poor pressure resistance, poor rigidity, poor dimensional stability during molding, and difficulty in connection, and is not suitable as a material for a water supply pressure pipe. However, due to its high health index, LDPE, especially LLDPE resin, has become a common material for the production of drinking water pipes. LDPE and LLDPE resins have low melt viscosity, good fluidity and easy processing, so the range of melt index is also wide, and the MI is usually between 0.3 and 3 g/10 min.
