Xyoo dhau los no, tau muaj qhov kev ua tau zoo nyob rau hauv cov dej pipeline, uas yog "rau lub cim yas hlau". Nrog rau kev npaj ceev ntawm polymer cov ntaub ntawv thiab kev siv tshuab, kev tsim cov yeeb nkab yas, kev txhim kho ntawm kev siv tshuab ua ke, cov yeeb nkab yas kom pom nws cov kev ua tau zoo. Niaj hnub no, yas tubing yog tsis yuam kev "pheej yig hloov" rau hlau tubing. Nyob rau hauv qhov kev hloov no, lub tshuab hluav taws xob tau zoo tshaj plaws, thiab ua kom muaj zog zoo nkauj, siv cov roj tsheb, dej, cov dej xau, kev ua liaj ua teb, kev siv tsheb thauj mus los ntawm cov mines, thiab cov khoom siv roj, cov chemicals thiab kev sib txuas lus thiab lwm cov hauj lwm, tshwj xeeb tshaj yog cov roj thauj tau dav siv.
HDPE yog ib qho thermoplastic polyolefin uas ua los ntawm ethylene copolymerization. Txawm hais tias HDPE tau pib rau xyoo 1956, lub hnab yas tsis tau txog nws qhov kev paub tseeb. Cov khoom siv dav dav no los kuj tsim txhua yam tshiab thiab kev lag luam.
Tuam Tshoj tus neeg muaj lub siab ua haujlwm polyethylene (HDPE tsis suav nrog high-density polyethylene cog ntau ntawm high-density polyethylene) cov khw muaj PetroChina, Sinopec, CNOOC peb lub lag luam loj, raws li ntawm qhov kawg ntawm 2006, yuav mus rau high-density polyethylene cog muaj 4 poob ntsej muag, namely, Lanzhou Petrochemical high-density polyethylene cog, deging petrochemical high-density polyethylene cog, Liaoyang petrochemical high-density polyethylene cog, Jilin Petrochemical high-density polyethylene cog.
High-density polyethylene feem ntau yog ua los ntawm Ziegler-natta, uas yog yus tsis tuaj ntawm branched chains ntawm molecular saw, kom cov molecular saw structured thiab muaj lub siab ntom. Cov txheej txheem yog raws cov ethylene ua raw khoom hauv tubular lossis autoclave reactor, thiab cov tshuaj tiv thaiv polymerization yog pib los ntawm oxygen lossis organic peroxide.
High-density ethylene yog ib qho chaw tiv thaiv ib puag ncig, rhaub mus rau qhov chaw melting, koj tuaj yeem tsim rov qab thiab rov qab siv dua. Cov khoom yas tuaj yeem raug faib ua ob yam loj: "Thermoplastic yas" thiab "thermosetting plastic" (thermosetting), "thermosetting plastic" yog kub mus rau ib qho kub ntev tom qab ua txoj kev kho mob, txawm tias tseem tshav kub tsis tau Cov khoom noj khoom haus zoo li "thermosetting plastic" (xws li cov log tsheb), tsis yog "thermoplastic" (xws li cov yas pallet) Lus cim: Pallets hauv Hong koob thiab Macao yog hu ua "plywood"), Yog li no , tsis yog tag nrho cov "yas" tsis yog kev phooj ywg zoo.
