Polyethylene hmoov(PE luv luv) yog cov thermoplastic resin ua los ntawm ethylene los ntawm polymerization. Qhov hnyav molecular yog cov kua tsis muaj xim, thiab qhov hnyav molecular hnyav yog saj tsis qab, tsis muaj ntxhiab, tsis yog - tshuaj lom, tsis muaj kuab lom, tsis muaj kuab paug dawb. Soluble nyob rau hauv dej, me ntsis soluble nyob rau hauv hydrocarbons, thiab lwm yam. Nws muaj peev xwm tiv taus corrosion ntawm feem ntau acids thiab alkalis, muaj dej nqus dej tsawg, tseem tuaj yeem tswj tau yooj yim ntawm qhov kub thiab txias, thiab muaj hluav taws xob rwb thaiv tsev siab. Hauv kev lag luam, nws kuj suav nrog ethylene thiab ib qho me me ntawm - Copolymers ntawm olefins. Nws muaj qhov kub thiab txias tsis kam (qhov tsawg kawg nkaus siv kub tuaj yeem ncav cuag - 100} ~ - 70℃C), tshuaj lom neeg ruaj khov, thiab tsis kam mus rau feem ntau cov kua qaub thiab alkalis (tsis resistant rau acids nrog oxidizing zog). Nws yog insoluble nyob rau hauv cov kuab tshuaj nyob rau hauv chav tsev kub, nrog me me nqus dej thiab zoo heev hluav taws xob rwb thaiv tsev.
Polyethylene yog rhiab heev rau ib puag ncig kev ntxhov siab (tshuaj lom neeg thiab kev ua haujlwm), thiab nws cov thermal aging kuj tsis zoo rau cov qauv tshuaj thiab ua cov sawb ntawm polymer. Polyethylene tuaj yeem ua tiav los ntawm cov txheej txheem thermoplastic molding. Nws muaj ntau yam kev siv, feem ntau yog siv los tsim cov yeeb yaj kiab, ntim khoom, ntim, kav, monofilament, xov hlau thiab cables, khoom siv txhua hnub, thiab lwm yam., thiab tuaj yeem siv tau raws li siab -cov ntaub ntawv rwb thaiv tsev zaus rau TV, radar, thiab lwm yam. Nrog rau kev tsim kho ntawm petrochemical kev lag luam, polyethylene ntau lawm tau tsim sai heev.
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Tshuaj Formula |
C4H10 |
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Exact Mass |
58 |
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Molecular Luj |
58 |
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m/z |
58 (100.0%), 59 (4.3%) |
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Elemental Analysis |
C, 82.66; H, 17.34 |
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Polyethylene hmoov(PE), raws li ib qho ntawm cov khoom siv dav siv thoob plaws ntiaj teb, tau pom nws cov nqi hloov tsis tau hauv ntau qhov chaw vim nws lub cev zoo tshaj plaws thiab tshuaj lom neeg.
Cov ntaub ntawv ntim khoom
Polyethylene tau dhau los ua cov khoom siv hauv kev lag luam ntim khoom vim nws cov dej noo zoo heev, tiv thaiv dej, thiab airtightness. Nws yog dav siv nyob rau hauv ntim khoom noj, khw muag khoom lub hnab, thiab cov hnab ntim cia, zoo tiv thaiv cov khoom ntawm ib puag ncig yam. Tsis tas li ntawd, npuas qhwv ua los ntawm polyethylene feem ntau yog siv rau ntim cov khoom tawg yooj yim vim nws cov kev cuam tshuam zoo heev thiab cushioning zog, muab kev ruaj ntseg lav rau kev thauj khoom.
(1) Ntim:
Polyethylene yog siv dav hauv kev ntim khoom noj, nrog rau cov hnab yas, cling zaj duab xis, cov thawv ntim khoom noj, thiab lwm yam. Vim nws tsis muaj tshuaj lom thiab corrosion kuj, polyethylene tuaj yeem ua kom muaj kev nyab xeeb thiab huv ntawm cov zaub mov. Lub caij no, cov khoom siv polyethylene kuj muaj cov pob tshab zoo, tso cai rau cov neeg siv khoom kom pom cov zaub mov hauv ntim thiab ua kom lawv lub siab xav yuav.
(2) Khw muag khoom thiab cov hnab ntim khoom:
Polyethylene ua cov khw muag khoom thiab cov hnab ntim khoom yog lub teeb yuag, ruaj khov, yooj yim nqa thiab khaws cia. Lawv tau siv dav hauv cov khw muag khoom xws li cov khw muag khoom loj thiab cov khw muag khoom, nrog rau hauv cov tsev khaws khoom txhua hnub. Cov hnab no tsis tsuas yog muaj cov dej tsis zoo, tab sis kuj tseem tiv thaiv plua plav thiab av kom nkag mus rau sab hauv ntawm lub ntim, khaws cov khoom kom huv thiab huv.
(3) Bubble zaj duab xis:
Polyethylene npuas zaj duab xis yog cov khoom siv tiv thaiv nrog cov khoom zoo heev. Nws yog dav siv nyob rau hauv lub ntim ntawm cov khoom tawg yooj yim xws li cov khoom siv hluav taws xob, cov khoom siv iav, cov khoom siv ceramic, thiab lwm yam. Cov qauv npuas hauv cov yeeb yaj kiab npuas tuaj yeem nqus tau thiab cuam tshuam cov quab yuam, tiv thaiv cov khoom ntawm kev puas tsuaj. Nyob rau tib lub sijhawm, npuas qhwv kuj muaj lub suab rwb thaiv tsev zoo thiab thermal rwb thaiv tsev, thiab tuaj yeem siv rau hauv thaj chaw xws li suab rwb thaiv tsev cov ntaub ntawv thiab cov ntaub ntawv thermal rwb thaiv tsev.
Cov khoom hauv tsev
Polyethylene ua cov khoom siv hauv tsev yog lub teeb yuag, ruaj khov, cuam tshuam resistant, thiab yooj yim los ntxuav. Lawv tau siv dav hauv qhov chaw sab hauv tsev thiab sab nraum zoov, nqa kev yooj yim thiab kev nplij siab rau tib neeg lub neej.
(1) Cov rooj tog yas:
Cov rooj tog zaum yas ua los ntawm polyethylene muaj qhov zoo ntawm kev hnav, ruaj, thiab yooj yim los ntxuav. Lawv tau siv dav hauv cov rooj tog zaum nraum zoov, cov menyuam yaus cov rooj tog thiab lwm yam. Cov rooj tog zaum sab nraum zoov xws li cov rooj zaum yas, rooj yas, thiab lwm yam tuaj yeem tiv taus qhov chaw hnyav xws li cua thiab hnub ci, thiab tuav lub neej ntev. Cov menyuam yaus cov rooj tog xws li cov khoom ua si yas, txaj yas, thiab lwm yam tuaj yeem ua kom muaj kev nyab xeeb thiab kev noj qab haus huv ntawm cov menyuam yaus.
(2) Cov thawv ntim khoom thiab cov thawv ntim khoom cia:
Polyethylene cia lub thawv thiab cov thawv ntim khoom muaj kev sib khi zoo thiab tsis muaj dej noo. Lawv tau siv dav hauv kev khaws cia hauv tsev txhua hnub, xws li khaws cov khaub ncaws, khoom ua si, phau ntawv, thiab lwm yam khoom. Cov thawv no tsis tsuas yog tiv thaiv plua plav thiab av los ntawm kev nkag mus rau sab hauv, tab sis kuj khaws cov khoom kom qhuav thiab huv si.
(3) Cov khoom siv hauv chav ua noj:
Polyethylene hmoovkuj yog siv dav hauv cov khoom siv hauv chav ua noj. Piv txwv li, cov khoom siv hauv chav ua noj xws li cov laug cam, cling film, thiab cov thawv ntim khoom noj yog txhua yam ua los ntawm polyethylene. Cov khoom no tsis tsuas yog tsis muaj - tshuaj lom thiab corrosion- cov khoom tiv thaiv, tab sis kuj ua kom muaj kev nyiam huv thiab kev nyab xeeb ntawm zaub mov. Nyob rau tib lub sijhawm, lawv kuj muaj qhov zoo ntawm qhov hnyav thiab yooj yim los ntxuav, nqa kev yooj yim rau tib neeg lub neej chav ua noj.
Industrial thiab Architectural Design
Polyethylene kuj tau siv dav hauv kev lag luam thiab kev tsim vaj tsev. Vim nws cov corrosion kuj thiab tshuaj tsis kam, polyethylene yog dav siv nyob rau hauv tsim ntawm industrial pipelines, cia tso tsheb hlau luam, waterproof membranes, thiab tiv thaiv pads.
(1) Industrial pipelines thiab cia tanks:
Polyethylene pipelines thiab cia tso tsheb hlau luam muaj qhov zoo xws li corrosion kuj, hnav tsis kam, hnav thiab siab zog. Lawv tau siv dav hauv cov kua thiab roj tsheb thauj mus los hauv kev lag luam xws li tshuaj lom neeg, roj av, thiab kev kho dej. Cov kav dej polyethylene thiab cov tso tsheb hlau luam tuaj yeem tiv taus qhov chaw hnyav xws li qhov kub thiab txias, thiab tuav lub neej ntev. Nyob rau tib lub sijhawm, lawv kuj muaj qhov zoo ntawm kev teeb tsa yooj yim thiab kev saib xyuas yooj yim, txo cov nqi engineering thiab sijhawm.
(2) Waterproof membrane thiab tiv thaiv ncoo:
Cov khoom siv polyethylene feem ntau yog siv los ua cov ntaub thaiv dej tsis zoo lossis cov ntaub thaiv tiv thaiv hauv kev tsim vaj tsev. Lawv tuaj yeem tiv thaiv dej nkag thiab yaig ntawm lub hauv paus thiab cov qauv ntawm cov tsev, ua kom lawv ruaj khov thiab kev nyab xeeb. Polyethylene waterproof zaj duab xis thiab cov ntaub thaiv npog muaj qhov zoo ntawm lub teeb yuag, yoog raws, thiab kev laus ua haujlwm, thiab tuaj yeem hloov mus rau ntau qhov chaw thiab kev nyab xeeb.
Lwm daim ntawv thov
Ntxiv rau cov lus saum toj no - hais txog, polyethylene kuj tau siv dav hauv kev ua liaj ua teb, kev kho mob, tsheb thiab lwm yam haujlwm.
(1) Agricultural Applications:
Polyethylene yog siv dav hauv kev ua liaj ua teb. Piv txwv li, ua liaj ua teb zaj duab xis, tsev xog paj zaj duab xis, thiab lwm yam yog tag nrho ua los ntawm polyethylene. Cov yeeb yaj kiab no tuaj yeem ua kom cov av kub thiab av noo, txhawb kev cog qoob loo thiab kev loj hlob. Nyob rau tib lub sijhawm, lawv tuaj yeem tiv thaiv kev loj hlob ntawm cov nroj tsuag thiab kev sib kis ntawm kab tsuag thiab kab mob, txhim kho qoob loo thiab zoo. Tsis tas li ntawd, polyethylene kuj tseem siv los tsim cov cuab yeej ua liaj ua teb xws li nuv ntses thiab hlua, muab kev yooj yim rau kev ua liaj ua teb.
(2) Kev siv kho mob:
Polyethylene kuj muaj qee yam kev siv hauv kev kho mob. Piv txwv li, qee cov khoom siv kho mob thiab cov khoom siv phais yog ua los ntawm polyethylene. Cov khoom no muaj qhov zoo ntawm kev ua tsis yog - tshuaj lom, tsis muaj ntxhiab, thiab corrosion- tiv taus, uas tuaj yeem ua kom muaj kev nyab xeeb thiab kev nyiam huv ntawm cov txheej txheem kho mob. Lub caij no, polyethylene kuj muaj qhov yooj yooj yim thiab plasticity, uas tuaj yeem siv los ua ntau yam duab thiab ntau thiab tsawg ntawm cov khoom siv kho mob thiab cov khoom siv kom tau raws li cov kev xav tau ntawm kev kho mob.
(3) Automotive kev siv:
Polyethylene kuj muaj qee yam kev siv hauv kev tsim tsheb. Piv txwv li, lub tsheb sab hauv, qhov chaw sab nrauv, roj tso tsheb hlau luam, thiab lwm yam khoom yog txhua yam ua los ntawm polyethylene. Cov khoom no muaj qhov zoo xws li lub teeb yuag, lub zog siab, thiab kev tiv thaiv corrosion, uas tuaj yeem txo qhov hnyav thiab roj noj ntawm lub tsheb, thiab txhim kho nws cov kev ua tau zoo thiab kev nplij siab. Lub caij no, polyethylene kuj muaj kev ua haujlwm zoo thiab cov yas, uas tuaj yeem hloov kho rau kev tsim khoom ntawm ntau yam duab thiab ntau thiab tsawg ntawm cov khoom siv tsheb.
Kev tsim kho thiab kev siv cov kev ua haujlwm siab polyethylene
Nrog rau kev nce qib ntawm kev siv thev naus laus zis thiab kev xav tau ntau ntxiv rau cov khoom siv, kev txhim kho thiab kev siv cov khoom siv siab tshaj -polyethylene ua tau zoo kuj tau txais kev saib xyuas ntxiv. Kev ua tau zoo ntawm cov ntaub ntawv polyethylene xws li siab - ntom polyethylene (HDPE) thiab ultra- siab molecular hnyav polyethylene (UHMWPE) muaj zog hnav tsis kam thiab dav siv rau kev lag luam.
(1) High density polyethylene (HDPE):
HDPE is a polyethylene material with high density, high strength, and high rigidity. Nws yog dav siv nyob rau hauv kev lag luam xws li ntim khoom, ntim khoom, piping systems, thiab automotive Cheebtsam. HDPE muaj qhov cuam tshuam zoo rau lub zog thiab hnav tsis kam, thiab tuaj yeem tiv taus ntau yam hnyav ib puag ncig thiab kev ntxhov siab. Tib lub sijhawm, HDPE kuj muaj kev ua haujlwm zoo thiab cov yas, uas tuaj yeem hloov kho rau kev tsim khoom ntawm ntau yam duab thiab ntau thiab tsawg ntawm cov khoom.
(2) Ultra siab molecular hnyav polyethylene (UHMWPE):
UHMWPE yog cov khoom siv polyethylene nrog qhov hnyav molecular siab heev. Nws muaj qhov hnyav hnyav heev, nws tus kheej -lubricating zog, thiab cuam tshuam tsis kam. UHMWPE yog dav siv nyob rau hauv kev tsim cov zawv zawg qhov chaw, hauv ob sab phlu, bearings, thiab lwm yam khoom nyob rau hauv kev sib txhuam thiab hnav. Tib lub sijhawm, UHMWPE kuj muaj biocompatibility zoo thiab corrosion kuj, thiab tuaj yeem siv los tsim cov khoom siv kho mob thiab cov pob qij txha thiab lwm yam khoom siv kho mob.
Polyethylene hmoov yog ntau yam khoom siv nrog ntau yam kev siv thoob plaws ntau yam kev lag luam. Nws muaj ntau hom, suav nrog LDPE, HDPE, thiab LLDPE, muaj ntau yam khoom uas tuaj yeem ua raws li cov kev xav tau tshwj xeeb. Cov txheej txheem ntau lawm, los ntawm polymerization mus rau post - polymerization ua, xyuas kom cov khoom zoo ntawm - hmoov zoo nrog cov khoom tswj. Raws li lub ntiaj teb txav mus rau lub neej yav tom ntej, kev tsim cov txheej txheem tsim khoom ruaj khov, cov khoom siv qib siab, thiab cov txheej txheem ntse yuav ntxiv dag zog rau lub luag haujlwm ntawm polyethylene hmoov hauv ntau qhov kev lag luam, ua rau nws yog ib qho khoom tseem ceeb thiab tsis muaj peev xwm.
Polyethylene hmoovtuaj yeem muab faib ua txoj kev siab siab, txoj kev nruab nrab siab thiab txoj kev tsis tshua muaj siab raws li polymerization siab.
Txoj kev kub siab yog siv los tsim cov khoom tsawg- polyethylene ntom ntom. Txoj kev no tau tsim thaum ntxov. Cov polyethylene tsim los ntawm txoj kev no tau suav txog li 2/3 ntawm tag nrho cov khoom siv polyethylene kom deb li deb. Txawm li cas los xij, nrog rau kev tsim cov thev naus laus zis thiab cov khoom siv hluav taws xob, nws txoj kev loj hlob tau lagged qab ntawm txoj kev tsis tshua muaj siab.
Txoj kev qis siab suav nrog txoj kev slurry, txoj kev daws teeb meem thiab cov txheej txheem roj.
Txoj kev slurry feem ntau yog siv los tsim high-polyethylene ntom ntom, thaum txoj kev daws teeb meem thiab vapor theem txoj kev tsis tuaj yeem tsim cov siab -density polyethylene, tab sis kuj tsim cov nruab nrab thiab qis- ntom polyethylene (tseem hu ua linear low-density.polyethylene) los ntawm kev ntxiv comonomers. Ntau yam tsawg- cov txheej txheem siab tau tsim sai heev.
Cov txheej txheem ntawm polymerizing ethylene rau hauv qis- ntom polyethylene siv oxygen lossis peroxide ua tus pib. Ethylene nkag mus rau hauv lub reactor tom qab ob compression thiab polymerizes rau hauv polyethylene nyob rau hauv lub siab ntawm 100 ~ 300 MPa, kub ntawm 200 ~ 300℃thiab qhov kev txiav txim ntawm pib. Cov reactants raug cais los ntawm decompression kom rov ua dua cov ethylene unreacted. Molten polyethylene yog extruded thiab granulated tom qab ntxiv cov yas additives.
Muaj peb txoj hauv kev: txoj kev slurry, txoj kev daws teeb meem thiab txoj kev roj theem. Tsuas yog txoj kev daws teeb meem, lub siab polymerization yog qis dua 2 MPa. Cov kauj ruam dav dav suav nrog kev npaj catalyst, ethylene polymerization, polymer sib cais thiab granulation.
① Slurry txoj kev:Cov polyethylene ua tau yog insoluble nyob rau hauv hnyav thiab zoo li slurry. Slurry polymerization muaj qhov mob me me thiab yooj yim rau kev khiav lag luam. Alkyl txhuas feem ntau yog siv los ua tus activator, hydrogen yog siv los ua tus tswj qhov hnyav molecular, thiab lub hwj chim reactor feem ntau siv. Lub polymer slurry los ntawm lub polymerization kettle yog xa mus rau lub hmoov tshuab ziab khaub ncaws los ntawm lub flash kettle thiab gas-kua separator, thiab ces nws yog granulated. Cov txheej txheem ntau lawm kuj suav nrog hnyav rov qab, hnyav refining thiab lwm cov kauj ruam. Cov khoom uas sib txawv molecular hnyav tis yuav tau los ntawm kev siv sib txawv polymerization reactors nyob rau hauv series los yog nyob rau hauv parallel.
② Kev daws teeb meem:polymerization yog nqa tawm nyob rau hauv hnyav, tab sis ethylene thiab polyethylene yog ob qho tib si soluble nyob rau hauv hnyav, thiab cov tshuaj tiv thaiv system yog homogeneous tov. Cov tshuaj tiv thaiv kub (Ntau dua lossis sib npaug rau 140 degree) thiab siab (4-5MPa) siab. It is characterized by short polymerization time, high production intensity, and can also produce high, medium and low density polyethylene, which can better control the properties of products; Txawm li cas los xij, cov polymer tau los ntawm txoj kev daws teeb meem muaj qhov hnyav molecular, nqaim molecular hnyav faib thiab cov ntsiab lus tsis tshua muaj.
③ Gas theem txoj kev:ethylene yog polymerized nyob rau hauv lub xeev gaseous, feem ntau nyob rau hauv ib tug fluidized txaj reactor. Muaj ob hom catalysts, uas yog chromium system thiab titanium system, uas tau ntxiv rau hauv txaj kom muaj nuj nqis los ntawm lub tank cia. Kev kub ceev ethylene ncig yog siv los tswj lub fluidization ntawm lub txaj thiab tshem tawm cov cua sov ntawm cov tshuaj tiv thaiv polymerization. Cov polyethylene generated yog tawm ntawm lub hauv qab ntawm lub reactor. Lub siab ntawm lub reactor yog li 2 MPa, thiab qhov kub yog 85 ~ 100 degree. Cov txheej txheem roj theem yog txoj hauv kev tseem ceeb tshaj plaws los tsim cov kab qis qispolyethylene. Cov roj theem txoj kev txuag cov kuab tshuaj rov qab thiab cov txheej txheem polymer kom qhuav, thiab txuag 15% ntawm kev nqis peev thiab 10% ntawm cov nqi khiav hauj lwm piv nrog rau txoj kev daws teeb meem. Nws yog 30% ntawm kev nqis peev ntawm ib txwm muaj siab - txoj kev siab thiab 1/6 ntawm tus nqi ua haujlwm. Yog li ntawd, nws tau tsim kho sai heev. Txawm li cas los xij, txoj kev roj theem yuav tsum tau txhim kho ntxiv ntawm cov khoom zoo thiab ntau yam.
Siv chromium catalyst txhawb nqa ntawm silica gel, ethylene yog polymerized nyob rau hauv nruab nrab siab nyob rau hauv lub voj reactor los tsim high- ntom.polyethylene hmoov.
Cov lus nug nquag
Dab tsi yog polyethylene feem ntau siv rau?
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Polyethylene los yog polythene (lub npe PE; IUPAC lub npe polyethene los yog poly (methylene)) yog cov yas uas feem ntau tsim. Nws yog ib qho polymer, feem ntau siv rauntim khoom (cov hnab yas, yas zaj duab xis, geomembranes thiab ntim nrog rau lub raj mis, khob, hub, thiab lwm yam).
Puas yog polyethylene glycol muaj kev nyab xeeb laxative?
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Raws li tshuaj,PEG yog ib feem ntawm cov chav kawm laxative. FDA- pom zoo cov lus qhia suav nrog kev kho mob cem quav hauv cov neeg mob hnub nyoog 17 xyoo thiab laus dua. PEG yog qhov zoo dua rau lwm tus neeg ua haujlwm rau cem quav thiab ua tsis taus pa vim nws cuam tshuam nrog kev cuam tshuam tsis zoo thiab qhov zoo dua - tasting profile.
Puas yog polypropylene muaj kev nyab xeeb rau lub cev?
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Tsis yog, polypropylene tsis muaj teeb meem. Nws yog cov yas muaj kev nyab xeeb uas feem ntau siv hauv cov thawv ntim khoom noj, cov khoom siv kho mob, thiab cov ntaub. Nws tsis muaj cov tshuaj phem xws li BPA thiab tsis yog - tshuaj lom. Polypropylene kuj tiv taus cua sov, yog li nws tsis tso cov khoom txaus ntshai thaum cua sov.
Cim npe nrov: polyethylene hmoov cas 9002-88-4, lwm tus neeg, manufacturers, hoobkas, lag luam wholesale, yuav, nqe, tej, kev muag khoom