low pressure polyethylene is produced from the purified ethylene and organometallic catalyst are the Al-triethyl and titanium tetrachloride.For polyethylene in the domestic industry uses several technology options that vary by type of constructions, the capacity of the reactor cleaning processes polyethylene on the catalyst used.
technology
most often carried out three consecutive steps: polymerization of ethylene, the process of cleaning it from the catalyst and the final drying.After stirring the solution of triethylaluminum and titanium tetrachloride in cyclohexane are added and gasoline.Heated up to 50 C two-percent solution was supplied to the reactor, where the system of airlift added ethylene.Stirring promotes partial mass polymerization of ethylene into polyethylene.
To remove the catalyst from the resulting polymer decomposition products are filtered off and dissolved.The centrifuge polyethylene from catalyst washed using methanol.
polyethylene of low pressure after washing, pressed, and substances added to it to improve.For clarification of stabilizer used, ethylene glycol and nitrophosphate solution, and to make it shinier, wax is applied.
Finally, polyethylene is subjected to drying and granulation.Polyethylene, low pressure is produced in the form of granules and powder.
Pipes of high density polyethylene
are used for installation of gas, sewer and water systems.
pipes are manufactured using the continuous extrusion methods.As raw material for the production of polyethylene in granules acts.
economically developed countries use such pipes in almost all systems.
HDPE pipes do not adversely affect water quality, as on the inner walls are formed rust is not going to mineral salts.
polyethylene of low pressure has been applied to the sewer system, since it is resistant to aggressive agents and high temperature.
Gas pipes is also not destroyed and do not lose performance properties for a long time.
Durability - superior quality pipes from HDPE.They are shock-resistant, do not rot or rust, do not crack under the influence of high and low temperatures.Their service life is several decades.
density polyethylene relatively soft and flexible.Its material has a relatively sparse arrangement of the molecules that primarily affects its density.LDPE produce a wide range of films.They have a very high quality, and for packaging material better option is perhaps to be found.It stores and maintains a set of positive properties, even at temperatures up to sixty degrees.Qualitative characteristics of the polyethylene do not change under the influence of chemicals.He is able to reliably isolate the product from moisture and water vapor.
