Low pressure polyethylene: use

Low pressure polyethylene is produced from purified ethylene, and triethylaluminum and titanium tetrachloride act as an organometallic catalyst. To produce 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: polymerization of ethylene, the process of its purification from the catalyst and the final drying. After mixing the solutions of triethylaluminum and titanium tetrachloride, they add cyclohexal and gasoline. Heated up to 50 C, a 2% solution is fed into the reactor, where ethylene is added via the airlift system. Stirring of the mass contributes to the partial polymerization of ethylene in polyethylene.

To remove polymer from the catalyst, the resulting decomposition products are filtered off and dissolved. In a centrifuge, polyethylene is washed from the catalyst using methyl alcohol.

Polyethylene of low pressure after washing is wrung out, and to it substances for quality improvement are added. For clarification, a stabilizer, ethylene glycol and sodium nitrophosphate are used, and to make it more shiny, wax is used.

Finally, the polyethylene is subjected to drying and granulation. Polyethylene of low pressure is available in the form of granules and powder.

Pipes from polyethylene of low pressure

They are used for installation of gas, sewage and water supply systems.

Pipes are manufactured using continuous extrusion techniques. As a raw material for production is polyethylene in granules.

Economically developed countries use such pipes in virtually all systems.

HDPE pipes do not adversely affect water quality, as rust is not formed on internal walls and mineral salts are not collected.

Low pressure polyethylene has found application in sewage 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.

Longevity is the main quality of HDPE pipes. They are shockproof, 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-pressure polyethylene is relatively soft and elastic. Its material has an arrangement of molecules relatively sparse, which, first of all, affects its density. From PVD produce a wide range of films. They differ very high quality, and for the packaging material the best option, perhaps, is not found. It retains and maintains 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.