Polyethylene (PE) yog thermoplastic cob tau los ntawm polymerizing ethylene. Industrially, cov tshuaj copolymers ntawm ethylene thiab ib qho me me ntawm ib qho α-olefin kuj muaj. Polyethylene tsis zoo, tsis zoo xws li siv quav ciab, zoo nkaus li siv tshuaj tsw qab (tsis tshua muaj kev kub hnyav tau txog -100 ~ -70 ° C), ruaj ntseg tshuaj zoo, thiab tuaj yeem tiv taus feem ntau acid thiab alkali corrosion (tsis resistant oxidation) Xwm ntawm cov kua qaub). Nws yog qhov tsis sib haum nyob rau hauv cov thev dej hauv chav tsev, muaj dej txaus thiab hluav taws xob zoo hluav taws xob.
Polyethylene (POLYETHYLENE, PE) yog ib qho polymer ua los ntawm ethylene. Cov khoom tau raug tsim los txog li 60 xyoo, thiab lub ntiaj teb cov polyethylene ntau tshaj plaws ua ntej ntawm cov saum toj no tsib feem ntau siv cov resins.
Polyethylene yog muab cais ua cov yas siab polyethylene, tsawg ntom polyethylene thiab linear tsawg ceev polyethylene nyob ntawm tus qauv polymerization, molecular nyhav thiab saw qauv.
Low-density polyethylene (LOW DENSITY POLYETHYLENE, LDPE) feem ntau hu ua high-pressure polyethylene. Vim nws tsawg ntom thiab cov khoom muag, nws yog siv hauv hnab yas thiab cov duab ua liaj ua teb.
High-density polyethylene (HIGH DENSITY POLYETHYLENE, HDPE) feem ntau hu ua low-pressure polyethylene. Piv nrog LDPE thiab LLDPE, nws muaj kev kub taub hau, kev ua haujlwm tsis muaj roj, ua pa tsis pom kev thiab qhov chaw ua haujlwm tsis zoo. Tsis tas li ntawd, hluav taws xob rwb thaiv tsev thiab kev ua haujlwm Zoo heev feem thiab txias ua hauj, tsuas yog siv hauv tshuab molding, kev txhaj tshuaj molding thiab lwm cov teb. [3] Kev Hlub
LINEAR LOWER DENSITY POLYETHYLENE (LLDPE) yog ib tug copolymer ntawm ethylene thiab ib qho nyiaj tsawg-olefin polymerized nyob rau hauv muaj qhov catalyst. Cov tsos ntawm LLDPE zoo ib yam li cov LDPE, thiab lub hau tsis zoo. Txawm li cas los xij, qhov ci ntsa dej zoo yog qhov zoo, thiab nws muaj qhov zoo ntawm qhov tsis tshua muaj qhov kub siab, siab tshaj, kev tswj kev tiv thaiv thiab kev nyuab siab rau kev nyuab siab, thiab lub zog zoo ntawm qhov tsawg.
Cov ntawv thov LLDPE tau nkag mus rau txhua lub lag luam LDPE. Nyob rau qib no, LLDPE thiab HDPE yog nyob rau theem ntawm kev loj hlob ntawm lub neej; LDPE nkag mus rau theem pib ntawm txoj kev loj hlob hauv xyoo 1980, thiab ob peb lub LDPE equipments tau muab tso rau hauv ntau lawm hauv lub ntiaj teb. Polyethylene tau tsim los ntawm extrusion, txhaj tshuaj, molding, tshuab molding thiab yaj spinning. Nws yog dav siv hauv kev lag luam, kev ua liaj / teb, ntim thiab txhua hnub kev lag luam. Nws yog dav siv nyob rau hauv Suav teb. Nyias zaj duab xis yog nws cov neeg siv ntau tshaj plaws thiab ua rau tsis ceev. 77% ntawm polyethylene thiab 18% ntawm high-density polyethylene. Tsis tas li ntawd, kev txhaj molding khoom, xaim thiab kabmob, cov khoom tsis zoo, lwm yam zoo li txhua tus neeg nyob hauv lawv txoj kev noj kev haus, thiab nyob rau hauv txoj haujlwm kev lag luam.