Cov yam ntxwv
General HDPE Melting taw tes ntawm 142 degree, decomposition kub ntawm 3 {{{{{{{11 {} degree; Txhaj tshuaj kub ntawm cov khoom siv tau hloov kho. Txhaj tshuaj molding, kev siv ntsuas kub ntawm 180 degree -230 degree; Vim tias nws yog ib qho olefin yas, nws tsis nqus dej, ntau lawm, tuaj yeem siv rau cov khoom kom qhuav 1hr, txhawm rau tawm cov dej ntab; Polyethylene melt viscosity yog loj, ntws ntawm cov khoom ntev me me, yog li, lub rooj thiab flatal channel yog loj; Cov khoom lag luam yog nquag mus rau electrostatic tawm, qhov saum npoo yog nquag nqus E. Qhov muaj nqis Shrinkage tus nqi yog 16 ‰, thiab tus nqi ntawm overflow ntug yog 0.05mm.
Ua yeeb yam
High-ceev polyethylene muaj cov cua sov thiab txias tsis kam, tshuaj lom neeg zoo, tab sis kuj muaj qhov siab ntawm rigidity thiab toughness, zoo siv lub zog. Dielectric cov yam ntxwv, tiv taus rau kev ntxhov siab ib puag ncig kev ntxhov siab kuj yog qhov zoo. Hardness, tensile muaj zog thiab nkag yog zoo dua li cov polyethylene; Puas Ua Ntej, Rwb Thaiv Hluav Taws Xob, Toffness thiab Txias Txias Ua Tau Zoo dua, tab sis me ntsis zuj zus li cov rwb thaiv tsev tsawg; Tshuaj lom neeg zoo, nyob rau hauv chav sov, Insoluble nyob rau hauv tej organic cov kuab tshuaj, tiv taus corrosion ntawm acids, alkalis thiab ntau cov ntsev; zaj duab xis permeability rau dej vapor thiab huab cua me me, cov dej nqus dej tsawg, tsawg; Kev txom nyem tsis zoo yog tsis zoo, thiab cov tsis kam mus rau ib puag ncig kev tawg yog tsis zoo li cov tshuaj tiv thaiv kab mob antioxidation yuav ua rau nws cov kev ua tau zoo, yog li cov khoom siv tsis taus los txhim kho qhov tsis ua haujlwm hauv thaj chaw no. Cov cua sov distalt Kub ntawm HDPE zaj duab xis yog tsawg tsawg kev ntxhov siab, uas yuav tsum tau sau tseg thaum ua ntawv thov.
Cov txheej txheem ntau lawm
PE yog feem ntau tsim los ntawm slurry lossis vapor-theem ua, thiab mus rau ib qho tsawg tshaj plaws los ntawm kev daws teeb meem. Tag nrho cov txheej txheem no yog exothermic cov kev tawm tsam muaj kev cuam tshuam nrog monomer, ib-olomer monomer, uas tej zaum yuav muaj ntau dua ib qho compound) thiab ntau hom kev ua haujlwm hauv hydrocarbon. Hydrogen thiab qee cov catalysts yog siv los tswj cov roj molecular. Lub slurry reactor feem ntau yog ib qho stirred hwj kais lossis ib qho ntawm feem ntau siv reactors loj nyob rau hauv uas cov slurry tuaj yeem yog kev ncig thiab steelred. Thaum muaj kev sib cuag ntawm cov ethylene thiab copolymer monomers (raws li yuav tsum tau) thiab catalyst, polyethylene pellets yog tsim. Tom qab tshem tawm cov depuent, cov polyethylene pellets lossis hmoov yog qhuav thiab ntxiv yog dosed los tsim cov pellets. Cov kab niaj hnub nrog cov tshuaj reactors loj nrog cov tshuaj reactors loj nrog Twin-ntsia hlau EXTRUDERS tuaj yeem tsim ntau dua 40, {5} PE ib teev. Kev txhim kho cov catalysts tshiab ua rau muaj kev txhim kho kev ua tau zoo ntawm cov qib tshiab ntawm HDPE. Ob hom catalyst feem ntau yog philips 'chromium oxide-raws catalysts thiab titanium compound monoalkyl txhuas catalysals. Cov Philips Ntaus catalyst ua yeeb yam HDPE nrog nruab nrab-dav molecular hnyav faib; Titanium-Alkyl-Aluminium catalyst ua cov nqaim molecular hnyav xa tawm. Cov catalysts siv los tsim cov polymers nrog lub ntsej muag melw hauv ib qho reactor tseem tuaj yeem siv los tsim cov qib MDW dav dav. Piv txwv li, ob zaug tandem reactors tsim cov khoom lag luam nrog cov hnyav molecular hnyav tuaj yeem tsim cov bimodal molecers hnyav faib cov khoom hnyav.