Main Products：UR644

Brief introduction：

polyethylene (PE, short for PE) is a thermoplastic resin prepared by the polymerization of ethylene. In industry, the copolymer of ethylene with a small amount of alpha-olefin is also included. Polyethylene is odorless, non-toxic, feel like wax, has excellent low temperature resistance (the lowest use temperature can reach -100~-70°C), good chemical stability, resistance to most acid and base erosion (not resistant to acid with oxidation properties). Insoluble in general solvents at room temperature, small water absorption, good electrical insulation. It is the most simple polymer organic compound and the most widely used polymer material in the world today. It is made of ethylene polymerization and divided into high density polyethylene, medium density polyethylene and low density polyethylene according to the different density. Low density polyethylene is soft and used for high pressure polymerization. High density polyethylene (HDPE) has the characteristics of rigidity, hardness and mechanical strength, and is often polymerized at low pressure. High-density polyethylene can be used as containers, pipes, and high-frequency electrical insulation for radar and television. Low density (high pressure) polyethylene is often used in large quantities. Polyethylene is waxy and has a waxy smoothness. When it is not stained, low-density polyethylene is transparent while high-density polyethylene is opaque. Polyethylene is a highly polymerized chain connected by repeated -- CH2 -- units through the addition reaction and polymerization reaction of ethylene (CH2=CH2). The properties of polyethylene depend on how it is polymerized; High density polyethylene (HDPE) was synthesized by Ziegler-Natta polymerization under medium pressure (15-30 atmospheres) of organic compounds. The polymerized polyethylene molecule is linear under this condition, and the molecular chain is very long, molecular weight up to hundreds of thousands. If it is under high pressure (100-300MPa), high temperature (190-210 C), peroxide-catalyzed free radical polymerization, the production is low density polyethylene (LDPE), it is branched structure.

Polyethylene is insoluble in water, water absorption is very small, even for some chemical solvents, such as toluene, acetic acid, and so on, only at 70 degrees above the temperature can be slightly dissolved. However, microparticle polyethylene can melt or solidify between 15℃ and 40℃ with the change of temperature. When the temperature rises, it melts and absorbs heat. When the temperature drops, it solidifies and gives off heat. And because it is very small water absorption, not easy to damp, insulation properties, so it is a good building material.

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