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high density polyethylene

BY ANKIT garg 11001005005 Chemical engg. 4th yr

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High density polyethylene

PropertiesHigh tensile strengthStronger intermolecular forcesLess branching as compared to

LLDPE so termed as high density polyethylene

It is harder and more opaque so used for making pipes

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NAPTHA(As refinery product)

ETHYlENE

HIGH DENSITY POLYETHYLENE(HDPE)

LOW DENSITY POLYETHYLENE(LDPE)

PROPYLENE

POLY PROPYLENE(PP)

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HOW HDPE IS PRODUCED

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RAW MATERIAL - Ethylene,Hydrogen (chain terminator)

CATALYST - Ziglar nata catalyst(transition metal)

COCATALYST - Triethyl aluminium

COMONOMER - Butene(in very small amount)

SOLVENT - Hexane(diluent)

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Various processes involved in hdpe production Polymerization Decanter Feed Vessel Centrifuge Drying (Fluidized bed dryer) Nitrogen scrubbing tower Powder treatment vessel Hexane distillation Butene recovery Pelletizing Extruder

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Applications of HDPE1. Helmets2. Pipes3. Polythenes4. Containers5. Cement packing6. bags

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applications of the polymer classes

Elastomers :Rubber is the most important of all elastomers. Natural rubber is a polymer whose repeating unit is isoprene.

Plastics : Among the most important and versatile of the hundreds of commercial plastics is polyethylene.

LDPE is soft and pliable and has applications ranging from plastic bags, containers, textiles, and electrical insulation, to coatings for packaging materials.

Major uses of HDPE are plastic tubing, bottles, and bottle caps.Fibers : Fibers represent a very important application of

polymeric materials, including many examples from the categories of plastics and elastomers.

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