mankhwala

Low Density Polyethylene,
Low Density Polyethylene,

Low-density polyethylene (LDPE) ndi utomoni wopangidwa pogwiritsa ntchito njira yoponderezedwa kwambiri kudzera mu polymerization yaulere ya ethylene ndipo imatchedwanso "high-pressure polyethylene".Popeza unyolo wake wa molekyulu uli ndi nthambi zambiri zazitali komanso zazifupi, LDPE imakhala yocheperako kuposa polyethylene yapamwamba kwambiri (HDPE) ndipo makulidwe ake ndi otsika.Imakhala ndi kuwala, kusinthasintha, kukana kwabwino kwa kuzizira komanso kukana mphamvu.LDPE ndi yokhazikika pamakina.Ili ndi kukana kwabwino kwa ma acid (kupatula ma oxidizing acids), alkali, mchere, zinthu zabwino kwambiri zamagetsi zamagetsi.Kulowa kwake kwa nthunzi ndikotsika.LDPE imakhala ndi madzi ambiri komanso kutheka bwino.Ndi oyenera kugwiritsidwa ntchito mitundu yonse ya njira thermoplastic processing, monga jekeseni akamaumba, extrusion akamaumba, kuwotcherera, rotomolding, ❖ kuyanika, thovu, thermoforming, otentha-ndege kuwotcherera ndi kuwotcherera matenthedwe.

Kugwiritsa ntchito

LDPE imagwiritsidwa ntchito makamaka popanga mafilimu.Amagwiritsidwa ntchito kwambiri popanga filimu yaulimi (mulching filimu ndi filimu yokhetsedwa), filimu yonyamula (yogwiritsidwa ntchito ponyamula maswiti, masamba ndi zakudya zozizira), filimu yowomberedwa pakuyika zamadzimadzi (zogwiritsidwa ntchito ponyamula mkaka, msuzi wa soya, madzi, nyemba zamkaka ndi mkaka wa soya), matumba onyamula katundu wolemetsa, filimu yodzaza ndi shrinkage, filimu yotanuka, filimu yotchinga, filimu yopangira nyumba, filimu yopangira mafakitale ndi matumba a chakudya.LDPE imagwiritsidwanso ntchito kwambiri popanga waya & chingwe chotchinjiriza sheath.Cross-linked LDPE ndiye chinthu chachikulu chomwe chimagwiritsidwa ntchito muzitsulo zopangira magetsi okwera kwambiri.LDPE imagwiritsidwanso ntchito popanga zinthu zopangidwa ndi jakisoni (monga maluwa opangira, zida zamankhwala, mankhwala ndi zinthu zopakira chakudya) komanso machubu opangidwa ndi ma extrusion, mbale, zokutira zamawaya & chingwe ndi zinthu zamapulasitiki zojambulidwa.LDPE imagwiritsidwanso ntchito popanga zinthu zopanda pake monga zotengera zakudya, mankhwala, zodzoladzola ndi mankhwala, ndi akasinja.

Phukusi, Kusungirako ndi Mayendedwe

LDPE ndi chidule cha Low Density Polyethylene.Polyethylene imapangidwa ndi polymerization ya ethylene.(Poly amatanthauza 'zambiri'; kwenikweni, amatanthauza ethylene yambiri).Ethylene imapezeka pophwanya mafuta opepuka a petroleum monga naphtha.

The otsika kachulukidwe akamagwira ndi mkulu-anzanu polymerization ndondomeko.Izi zimapanga mamolekyu okhala ndi nthambi zambiri zam'mbali.Nthambi zam'mbali zimatsimikizira kuti kuchuluka kwa crystallization kumakhalabe kochepa.Mwa kuyankhula kwina, chifukwa cha mawonekedwe awo osagwirizana, mamolekyu sangathe kugona kapena pamwamba pa wina ndi mzake mwadongosolo lokonzekera bwino, kotero kuti zochepa za izo zigwirizane ndi malo enaake.Kutsika kwa crystallization kumachepetsanso kachulukidwe kazinthu.

Chitsanzo chabwino cha izi m’moyo watsiku ndi tsiku ndi madzi ndi ayezi.Madzi oundana ndi madzi (apamwamba) owoneka bwino kwambiri, motero amapepuka kwambiri kuposa madzi (ayezi wosungunuka).

LDPE ndi mtundu wa thermoplastic.Ndi pulasitiki yomwe imafewa ikatenthedwa, mosiyana ndi mphira mwachitsanzo.Izi zimapangitsa thermoplastics kukhala yoyenera kugwiritsidwanso ntchito.Pambuyo pakuwotcha, imatha kubweretsedwa mumitundu ina yomwe mukufuna.