Polyethene (PE) is a thermoplastic resin produced by polyethene polymerization. In industry, copolymers of ethylene with a small amount of α -olefin are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest temperature can reach -100~-70°C), good chemical stability, can withstand most acid and alkali erosion (not resistant to acid with oxidizing properties). Insoluble in general solvents at room temperature, low water absorption, excellent electrical insulation.
What is PE and PE material?
PE is a polymer mainly used for packaging such as plastic bags, plastic films, geomembranes and containers, including bottles, etc.
Is PE plastic safe?
While polyethylene is relatively stable, and it is generally considered a safer plastic for food and drink, it has also been shown to leach plastic additives. In one study, pure polyethylene resin did not leach any endocrine disrupting chemicals but common food containers made with polyethylene did leach. The good news regarding Polyethylene is that the material itself has no negative effects on our environment unless of course it is littered. It is completely safe to handle and touch and even lick.
Polyethylene is divided into high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) according to polymerization method, molecular weight and chain structure.
Low density polyethylene (LDPE)
Properties:
Tasteless, odorless, non-toxic, matte surface, milky waxy particles, density of about 0.920g /cm3, melting point 130℃ ~ 145℃. Insoluble in water, slightly soluble in hydrocarbons, etc. Resistance to most acid and alkali erosion, water absorption is small, at low temperature can still maintain softness, high electrical insulation.
USES:
Can use injection molding, extrusion, blow molding and other processing methods. Mainly used for agricultural film, industrial packaging film, medicine and food packaging film, machinery parts, daily necessities, building materials, wire, cable insulation, coating and synthetic paper.
Linear low density polyethylene (LLDPE)
Properties:
Because the molecular structure of LLDPE and LDPE is obviously different, the performance is also different. Compared with LDPE, LLDPE has excellent environmental stress cracking resistance and electrical insulation, higher heat resistance, impact resistance and puncture resistance. Production process: LLDPE resin is mainly produced by full density polyethylene unit, and the representative production process is Innovene process and Unipol process of UCC.
USES:
Through injection molding, extrusion, blow molding and other molding methods, production of film, daily necessities, pipes, wires and cables, etc
High density polyethylene (HDPE)
Nature: natural color, cylindrical or flat round particles, particles smooth, particle size in any direction should be 2 mm ~ 5 mm, no mechanical impurities, thermoplastic.
Production process:
Two production processes, gas phase method and slurry method, are adopted.
USES:
By injection molding, blow molding, extrusion, rolling molding and other molding methods, we produce film products, daily necessities and various sizes of industrial hollow containers
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