2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
LDPE is made from purified ethylene, and triethylaluminum and titanium tetrachloride act as an organometallic catalyst.
To obtain polyethylene in the domestic industry, several technological options are used, which differ in the type of structures, reactor capacity, methods of washing polyethylene from the catalyst used.
Technology
Most often, three consecutive operations are carried out: ethylene polymerization, the process of cleaning it from the catalyst and final drying. After mixing solutions of triethylaluminum and titanium tetrachloride, cyclohexal and gasoline are added to them. Heated to 50 C, a two percent solution is fed into the reactor, where ethylene is added via the airlift system. Stirring the mass contributes to the partial polymerization of ethylene into polyethylene.
To remove the catalyst from the polymer, the resulting decomposition products are filtered off and dissolved. Polyethylene is washed from the catalyst in a centrifuge using methyl alcohol.
Low-density polyethylene is pressed after washing, and substances are added to it to improve its quality. A stabilizer, ethylene glycol and sodium nitrophosphate are used to lighten it, and wax is used to make it more shiny.
Finally, polyethylene is dried and granulated. LDPE is available in granular and powder form.
LDPE pipes
Used for installation of gas, sewer and water systems.
Pipes are manufactured using continuous extrusion techniques. The raw material for production is polyethylene in granules.
Economically developed countries use such pipes in almost all systems.
HDPE pipes do not adversely affect water quality, as rust does not form on the inner walls and mineral s alts do not collect.
LDPE has found use in sewer systems as it is resistant to aggressive substances and high temperatures.
Gas pipes also do not collapse and do not lose their operational properties for a long time.
Durability is the main quality of HDPE pipes. They are shock-resistant, do not rot and do not rust, do not crack under the influence of high and low temperatures. Their service life is several decades.
High density polyethylene is relatively soft and elastic. Its material has an arrangement of moleculesrelatively rarefied, which primarily affects its density. A wide range of films are produced from LDPE. They are of very high quality, and for packaging material the best option, perhaps, cannot be found. It retains and withstands a set of positive properties even at temperatures reaching sixty degrees. The qualitative characteristics of such polyethylene do not change under the influence of chemicals. It is able to reliably isolate products from moisture and water vapor.
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