LLDPE
LLDPE is a polyethylene with a density < 965 kg/m, produced by a low pressure process. Polyolefins are produced from olefin (alkene) monomers because the olefins contain a reactive double bond. The starting material, ethylene, is called the monomer and the final product consisting of many thousands of bound ethylene units is called the polymer. Co-monomers (higher alpha olefins such as butene, hexene, octene) are used to control the density and other physical properties Two main techniques are used for the production of LLDPE.
Gas phase polymerisation: A gas phase reactor is essentially a fluidised bed of dry polymer particles maintained either by stirring or by passing gas (ethylene) at high speeds through it. Pressures are usually relatively low at ~2MPa and temperatures are usually in the range of 70-110°C. The molten polymer is mixed with stabilizers and generally extruded into pellets.
Solution polymerisation: the polymer is produced at relatively low temperature (70-110°C) and low pressure (1 – 5 MPa) in a saturated hydrocarbon medium. The polymer forms suspension or mobile slurry. The reaction medium is removed and the polymer separated from the hydrocarbon inert diluents . The obtained powder is mixed with stabilizers and generally extruded into pellets.
Applications:
• Landfill caps / closures
• Lagoon Liners
• Canal linings
• Pond Liners
• Agriculture Pond Liners
• Mining Heap Leach Pads
• Raw water treatment reservoirs
• Potable water reservoirs
• Retention ponds
• Floating Covers
• Secondary containment for above ground
storage tanks
• Solutions ponds for mining applications
• Tank linings
• Waste water treatment lagoon
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