Hais txog PE Yas

PE polyethylene

(C2H4)n

POlyethylene yog ib qho thermoplastic cob tau los ntawm polymerizing ethylene. Hauv kev lag luam, copolymers ntawm ethylene nrog me me ntawm alpha-olefins kuj suav nrog. Polyethylene odorless, tsis muaj tshuaj lom, zoo li siv quav ciab, nrog kev ua haujlwm tsis zoo ntawm qhov kub thiab txias (tsawg kawg yog -100 ~ -70 ° C), tshuaj lom neeg ruaj khov, tsis kam mus rau feem ntau cov kua qaub-puag yaig (tsis kam rau oxidation xwm ntawm cov kua qaub). Insoluble nyob rau hauv ib txwm kuab tshuaj nyob rau hauv chav tsev kub, dej nqus, zoo heev hluav taws xob rwb thaiv tsev.

PE yas

• High Density Polyethylene (HDPE)

& quot; High Density Polyethylene", hu ua" HDPE." HDPE yog qib siab ntawm crystallinity, tsis yog-polar thermoplastic resin. Cov tsos ntawm thawj HDPE yog milky dawb.

HDPE yog cov thermoplastic polyolefin ua los ntawm copolymerization ntawm ethylene. Txawm hais tias HDPE tau qhia hauv xyoo 1956, cov yas tsis tau mus txog theem ntawm kev loj hlob. Cov khoom siv ntau yam no txuas ntxiv txhim kho nws cov kev siv tshiab thiab kev lag luam.

Cov yam ntxwv tseem ceeb

HDPE yog lub siab crystallinity, uas tsis yog-polar thermoplastic resin. Tus nkauj xwb HDPE muaj ib tug milky dawb tsos thiab ib tug me ntsis translucent tsos ntawm ib tug nyias nyias. PE muaj kev tiv thaiv zoo heev rau feem ntau lub neej thiab cov tshuaj siv tshuaj. Qee hom tshuaj muaj peev xwm ua rau cov tshuaj corrosion, xws li corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), thiab halogenated hydrocarbons (carbon tetrachloride). Lub polymer yog non-hygroscopic thiab muaj dej vapor tsis kam rau cov ntawv ntim khoom.HDPE muaj cov khoom siv hluav taws xob zoo, tshwj xeeb tshaj yog lub zog dielectric siab, ua rau nws haum rau cov hlau thiab cable. Cov qib nruab nrab mus rau qib siab molecular hnyav muaj qhov cuam tshuam zoo heev, ob qho tib si ntawm ambient thiab txawm tias qis -40F. Cov khoom tshwj xeeb ntawm HDPE yog kev sib xyaw kom zoo ntawm plaub qhov sib txawv:. Lub sib txawv densities, molecular tes taw hnyav li, molecular yuag distributions thiab additives yog siv los ua tailor-made tshwj xeeb polymers Cov tsiaj ua ke kom khoom HDPE qib rau sib txawv; qhov zoo tshaj plaws sib npaug ntawm kev ua haujlwm.

Qhov ntom

Qhov no yog qhov sib txawv tseem ceeb uas txiav txim siab cov yam ntxwv ntawm HDPE, txawm hais tias plaub qhov sib txawv tau hais los yeej muaj feem cuam tshuam rau ib leeg. Ethylene yog cov khoom siv tseem ceeb rau polyethylene. Ob peb lwm cov comonomers, xws li 1-butene, 1-hexene los yog 1-octene, kuj nquag siv los txhim kho cov khoom ntawm polymers. Rau HDPE, cov ntsiab lus ntawm ob peb monomers feem ntau tsis ntau tshaj 1% -2%. Qhov sib ntxiv ntawm comonomer me ntsis diminishes lub crystallinity ntawm lub polymer. Qhov kev hloov no feem ntau ntsuas los ntawm qhov ceev, qhov ceev thiab crystallization tus nqi yog linear. Kev faib tawm dav dav hauv Tebchaws Meskas raws li ASTM D1248 cov cai, HDPE ntom ntom 0.940g / . C los yog ntau dua; nruab nrab ntom polyethylene (MDPE) ntom ntau 0.926 ~ 0.940g / CC. Lwm cov kev sau se qee zaum faib MDPE li HDPE lossis LLDPE. Homopolymers muaj lub siab tshaj plaws ceev, ntau nruj, zoo impermeability thiab siab tshaj plaws melting point, tab sis feem ntau muaj cov neeg pluag ESCR. ESCR yog lub peev xwm ntawm PE los tiv thaiv kev tawg los ntawm kev siv tshuab lossis tshuaj lom neeg kev ntxhov siab Ntau dua qhov ntom ntom feem ntau txhim kho cov khoom siv dag zog xws li tensile lub zog, nruj thiab hardness; thermal zog xws li softening point thiab kub distortion kub; thiab impermeability, xws li huab cua permeability lossis dej vapor permeability. Qhov ntom ntom qis txhim kho nws qhov cuam tshuam lub zog thiab E-SCR. Qhov ntom ntawm cov polymer feem ntau cuam tshuam los ntawm kev sib ntxiv ntawm comonomer tab sis kom tsawg dua los ntawm qhov hnyav molecular. Qhov siab molecular hnyav feem pua ​​​​ua rau me ntsis txo qhov ntom. Piv txwv li, homopolymers muaj qhov sib txawv ntawm qhov dav ntawm qhov hnyav molecular.

Kev tsim khoom thiab catalyst

Cov txheej txheem ntau tshaj plaws ntawm PE ntau lawm yog los ntawm slurry lossis roj theem ua, thiab ob peb yog tsim los ntawm kev daws teeb meem theem. Tag nrho cov txheej txheem no yog exothermic cov tshuaj tiv thaiv nrog ethylene monomers, alpha-olefin monomers, catalyst systems (uas tej zaum yuav muaj ntau tshaj ib tug compound), thiab ntau hom hydrocarbon diluents. Hydrogen thiab qee cov catalysts yog siv los tswj qhov hnyav molecular. Slurry reactors feem ntau yog nplawm tso tsheb hlau luam los yog siv ntau lub voj voog reactor qhov twg cov slurry yog ncig thiab nplawm. Thaum ethylene thiab comonomer (raws li xav tau) tuaj rau hauv kev sib cuag nrog cov catalyst, polyethylene hais yog tsim. Tom qab tshem tawm cov diluent, cov polyethylene granules los yog granules yog qhuav thiab dosed nrog additives los tsim pellets. Kev hloov kho tshiab ntawm lub reactor loj nrog lub ntxaib-ntsia hlau extruder tsim PE 400,000 phaus ib teev lossis ntau dua. Txoj kev loj hlob ntawm cov catalysts tshiab tau pab txhawb kev txhim kho cov qib tshiab ntawm HDPE. Ob hom catalyst feem ntau siv yog Phillips chromium oxide catalysts thiab titanium compound monoalkylaluminum catalysts. HDPE ua los ntawm Philip-type catalysts muaj qhov nruab nrab-dav qhov hnyav molecular faib; mono-alkyl aluminium catalyst muaj qhov nqaim molecular hnyav faib. Catalysts rau zus tau tej cov nqaim MDW polymers siv composite reactors kuj yuav siv tau los tsim dav MDW qib. Piv txwv li, ob lub tandem reactors tsim cov khoom hnyav molecular sib txawv tuaj yeem tsim bimodal molecular hnyav polymers nrog rau tag nrho-dav qhov hnyav molecular tis.

Molecular hnyav

Qhov hnyav dua molecular ua rau muaj cov viscosities ntau dua polymer, txawm hais tias cov viscosity kuj tseem cuam tshuam rau qhov kub thiab txias siv rau kev kuaj. Qhov hnyav molecular ntawm cov khoom yog tus cwj pwm los ntawm rheological lossis molecular hnyav ntsuas.HDPE qib feem ntau muaj qhov hnyav molecular ntau ntawm 40 000 txog 300 000. Qhov hnyav nruab nrab molecular hnyav roughly sib haum mus rau qhov ntsuas qhov ntsuas ntawm 100 txog 0. 029/10 feeb. Feem ntau, siab dua MW (qis Melt Index MI) txhim khu lub zog yaj, zoo dua toughness thiab ESCR, tab sis siab dua MW enables .

Kev ua haujlwm

Cov txheej txheem nyuaj dua thiab yuav tsum tau siab dua lossis kub.

Molecular weight tis (MWD): Lub WD ntawm PE txawv ntawm nqaim mus rau dav nyob ntawm tus catalyst thiab cov txheej txheem siv.

Qhov feem ntau siv MWD ntsuas ntsuas yog Uniformity Index (HI) uas yog sib npaug rau qhov hnyav nruab nrab molecular hnyav (MW) muab faib los ntawm tus lej nruab nrab molecular hnyav (Mn). Qhov ntsuas qhov ntsuas no rau txhua qib HDPE yog 4-30. Narrow MWD muab kev ua tsov rog tsawg thiab muaj kev cuam tshuam loj thaum lub sij hawm molding. Mid-rau-wide MWD muab cov txheej txheem rau feem ntau cov txheej txheem extrusion. Wide MWD kuj tseem txhim kho lub zog yaj thiab nkag siab tsis kam.

Ntxiv

Antioxidants ntxiv los tiv thaiv kev degradation ntawm cov polymer thaum ua thiab tiv thaiv oxidation ntawm cov khoom tiav thaum siv. Antistatic additives yog siv nyob rau hauv ntau qib ntim los txo cov adhesion ntawm lub raj mis los yog tej pob khoom rau av thiab av. Cov ntawv thov tshwj xeeb yuav tsum muaj cov tshuaj ntxiv tshwj xeeb, xws li siv cov xaim thiab cable cuam tshuam nrog tooj liab inhibitors. Cov huab cua zoo heev thiab UV tsis kam (lossis nruab hnub) tuaj yeem ntxiv los ntawm kev ntxiv cov tshuaj tiv thaiv UV. Tsis muaj ntxiv los tiv thaiv UV lossis carbon dub PE, nws raug pom zoo kom tsis txhob siv sab nraum zoov ntxiv. High-grade carbon dub pigments muab UV tiv thaiv zoo heev thiab tuaj yeem siv sab nraum zoov ntau zaus, xws li cov xov hlau, cables, troughs, lossis kav dej.

Txoj kev ua

PE tuaj yeem tsim tau siv ntau hom kev sib txawv. Siv ethylene ua cov khoom tseem ceeb, propylene, 1-butene thiab hexene li interpolymers, slurry polymerization los yog roj theem polymerization txheej txheem yog nqa tawm nyob rau hauv qhov kev txiav txim ntawm catalyst, thiab cov polymer tau flashed, sib cais, qhuav thiab granulated thiab lwm yam. tau ib yam khoom tiav. Xws li cov ntawv extrusion, zaj duab xis extrusion, yeeb nkab lossis profile extrusion, tshuab moulding, txhaj tshuaj molding thiab rotational molding.

PE Atomic Structure Diagram

▲ Extrusion: . Cov qib uas siv rau extrusion feem ntau muaj qhov ntsuas kub tsawg dua 1 thiab qhov dav dav rau MWD. Tsawg MI ua tiav lub zog tsim nyog thaum ua tiav. Cov qib MWD yog qhov tsim nyog rau extrusion ntau dua vim tias lawv muaj kev ua haujlwm siab dua, txo qis kev tuag siab thiab txo qis rau cov pob txha tawg.

PE muaj ntau yam kev siv extrusion xws li xov hlau, cables, hoses, raj thiab profiles. Tubing daim ntaub ntawv muaj xws li los ntawm me me-section daj leeg rau cov roj ntuj mus rau tuab-walled dub hlab rau 48-inch inch kav rau industrial thiab nroog daim ntawv thov. Cov kav dej loj loj hollow-walled yog siv los hloov cov kav dej ua vaj tse thiab lwm cov kav dej phwj tuaj kom loj hlob sai.

Sheet thiab Thermoforming: Thermoformed hauv ob sab phlu rau ntau cov picnic reefers loj yog ua los ntawm PE rau toughness, lub teeb yuag thiab durability. Lwm cov ntawv thiab cov khoom siv thermoformed muaj xws li fenders, tank linings, pan baskets Thauj thawv thiab cov kaus poom. Feem ntau ntawm daim ntawv thov loj hlob sai yog mulch lossis pas dej hauv qab uas yog raws li MDPE rau nws cov tawv tawv, tshuaj tiv thaiv thiab impermeability.

▲ tshuab moulding: HDPE1/3 muag hauv Tebchaws Meskas rau tshuab moulding lub hom phiaj. Cov no muaj xws li cov fwj uas muaj tshuaj dawb, lub cev muaj zog, cov tshuaj ntxuav tes, mis nyuj thiab dej distilled mus rau lub tub yees loj, tsheb roj tank thiab cartridges. Cov khoom xws li yaj lub zog, ES-CR thiab toughness yog zoo ib yam li cov ntaub ntawv thiab thermoforming daim ntaub ntawv, yog li cov qib zoo sib xws yuav siv tau.

Kev txhaj tshuaj molding feem ntau yog siv los ua cov ntim me me (tsawg dua 16 ooj). Qhov kom zoo dua ntawm cov txheej txheem no rau kev ntim tshuaj, tshuaj zawv plaub hau thiab tshuaj pleev ib ce yog tias lub raj mis tau txais kev deburred yam tsis muaj lub tshuab moulding li niaj zaus tom qab hnav khaub ncaws. Txawm hais tias qee qhov nqaim MWD qib tau siv los txhim kho qhov chaw tiav, qhov dav mus rau qib MWD feem ntau siv.

▲ Kev Txhaj Tshuaj: Muaj ntau ntau daim ntawv thov ntawm HDPE, xws li rov qab siv tau nyias-phab ntsa dej khob rau 5-GSL cov kaus poom, uas haus 1/5 ntawm kev tsim tawm hauv tsev ntawm HDPE txhaj tshuaj qib dav dav qhov ntsuas ntawm 5 txog 10, nrog toughness. Cov qib qis qis thiab cov qib ntws siab dua rau kev ua haujlwm muaj xws li cov khoom siv phab ntsa nyias nyias rau cov khoom siv niaj hnub thiab ntim khoom noj; tawv, khoom noj khoom haus thiab cov xim pleev xim; siab tsis kam rau ib puag ncig kev ntxhov siab tawg daim ntaub ntawv xws li lub cav roj tso tsheb hlau luam me me thiab 90 - Gal'

▲ Rotational Moulding: Cov khoom siv uas siv cov qauv no feem ntau yog crushed rau hauv cov khoom siv hmoov uas yaj thiab ntws hauv thermal cycling. Ob hom PE yog siv. General Purpose thiab Crosslinkable General Purpose MDPE / HDPE qib feem ntau nyob rau hauv qhov ceev ntawm 0.935 mus rau 0.945 g / cc nrog nqaim MWD kom muaj kev cuam tshuam siab thiab tsawg kawg warpage ntawm cov khoom nrog lub melt index feem ntau nyob rau hauv 3-8 ntau yam. Cov qib siab MI feem ntau tsis haum vim tias lawv tsis muaj qhov xav tau kev cuam tshuam thiab ib puag ncig kev ntxhov siab tawg tsis kam ntawm cov khoom sib hloov molded.

Kev ua haujlwm siab rotational molding daim ntawv thov siv cov khoom tshwj xeeb ntawm lawv cov qib sib txuas sib txuas. Cov qib no yog cov kua dej hauv thawj theem ntawm lub voj voog molding thiab tom qab ntawd crosslink los tsim lawv cov kev tiv thaiv zoo rau ib puag ncig kev ntxhov siab tawg thiab toughness. Abrasion kuj thiab weatherability. Crosslinkable PE yog qhov tshwj xeeb tsim rau cov ntim loj xws li 500 nkas loos ntawm cov tshuaj cia tso tsheb hlau luam mus txog 20,000 nkas loos ntawm cov chaw ua liaj ua teb.

▲ Zaj duab xis: PE zaj duab xis ua feem ntau yog siv cov tshuab tshuab ua yeeb yaj kiab lossis extrusion ua feem ntau ntawm PE rau zaj duab xis, dav dav PE (LDPE) lossis linear low-density PE (LLDPE) feem ntau muaj. rau superior Lub stretchability thiab zoo heev impermeability ntawm qhov chaw. Piv txwv li, HDPE zaj duab xis feem ntau yog siv rau hauv cov hnab ntim khoom, hnab ntim khoom noj thiab ntim khoom noj.

Khoom ua haujlwm

High-density polyethylene yog non-toxic, tasteless, odorless dawb hais, melting point yog hais txog 130 ℃, tus txheeb ze ceev ntawm 0.941 ~ 0.960. Nws muaj cov cua sov ua haujlwm zoo thiab ua haujlwm txias, tshuaj lom neeg ruaj khov, tab sis kuj muaj siab rigidity thiab toughness, zoo mechanical zog. Dielectric zog, ib puag ncig kev ntxhov siab tawg kuj zoo dua.

Ntim thiab khaws cia

Cia yuav tsum nyob deb ntawm qhov hluav taws kub, rwb thaiv tsev kub, warehouses yuav tsum qhuav, huv si, tsis sib tov ntawm impurities, tsis muaj hnub, los nag. Kev thauj mus los yuav tsum tau muab khaws cia rau hauv qhov chaw huv, qhuav, npog lossis cov cab uas tsis muaj cov khoom ntse xws li cov ntsia hlau. Non-flammable aromatic hydrocarbons, halogenated hydrocarbons thiab lwm yam organic solvents sib xyaw ua haujlwm.

rov siv dua thiab rov siv dua

HDPE yog qhov loj tshaj plaws ntawm kev lag luam yas rov ua dua tshiab. Qhov no feem ntau yog vim nws yooj yim ntawm reprocessing, tsawg degradation thiab nws kim heev siv nyob rau hauv ntim daim ntaub ntawv. Qhov tseem ceeb ntawm kev rov ua dua tshiab yog kev siv 25% cov khoom siv rov ua dua tshiab, xws li cov khoom siv tom qab muag (PCR), nrog HDPE nkauj xwb rau kev rov ua dua los ua cov fwj uas tsis yog khoom noj.

Tsawg ntom polyethylene (LDPE)

Cov khoom siv yas uas tsim nyog rau ntau yam txheej txheem molding hauv thermoforming. Kev tsim cov txheej txheem, xws li kev txhaj tshuaj molding, extrusion, tshuab moulding, teb molding, txheej, ua npuas ncauj tshuab, thermoforming, cua kub vuam, thermal vuam.

Lub hom phiaj tseem ceeb

LDPE yog rau cov khoom siv zaj duab xis, tsim rau cov yeeb yaj kiab, ntim zaj duab xis, cov ntaub ntawv rwb thaiv tsev, kev txhaj tshuaj molding thiab cov khoom ua npuas ncauj.

Xws li kev ua liaj ua teb zaj duab xis, zaj duab xis mulching zaj duab xis, ntawv yas, zaub tsev cog khoom zaj duab xis; ntim zaj duab xis xws li khoom qab zib, zaub, ntim khoom noj khov; kua ntim tshuab zaj duab xis (mis nyuj, kua ntses, kua txiv hmab txiv ntoo, taum paj, kua mis nyuj) Hnab, Shrink Packaging Film, Elastic Film, Lined Film; Architectural Film, General Industrial Ntim Zaj duab xis thiab cov hnab ntim khoom noj. LDPE kuj tseem siv rau hauv kev txhaj tshuaj molded cov khoom, xws li cov thawv me me, hau, cov khoom siv hauv tsev, cov paj yas, ib lub tshuab ncab molding lub thawv yas. Cov khoom siv kho mob, tshuaj thiab cov khoom ntim khoom noj, cov kav dej extruded, cov ntawv txheeb, hlau thiab cable txheej, profile, thermoforming thiab lwm yam khoom; tshuab moulding hollow molding khoom, xws li cov thawv ntim khoom noj nrog cov khoom noj siv mis thiab jam, tshuaj, tshuaj pleev ib ce, tshuaj ntim khoom, tso tsheb hlau luam thiab lwm yam.

txoj kev tsim khoom

Tsawg-density polyethylene los ntawm txoj kev polymerization tuaj yeem muab faib ua kev kub siab thiab tsis tshua muaj siab. Raws li hom reactor tuaj yeem muab faib ua lub tank thiab raj txoj kev. Ethylene li raw khoom, mus rau hauv lub reactor, nyob rau hauv qhov kev txiav txim ntawm tus pib mus rau siab compression polymerization cov tshuaj tiv thaiv, cov khoom los ntawm lub reactor, tom qab tshem tawm unreacted ethylene los ntawm lub separator, yaj extrusion granulation, qhuav, tov ua ke, xa mus rau lub ntim. .

Khoom ua haujlwm

Tsawg-density polyethylene yog milky dawb pearlescent hais. Non-toxic, tasteless, odorless, matte tiav. Qhov ceev ntawm 0.916 ~ 0.930 g / cubic centimeter. Cov khoom yog softer, nrog zoo extensibility, hluav taws xob rwb thaiv tsev, tshuaj stability, processability thiab tsis kub tsis kam (resistant rau -70 ℃), tab sis cov neeg kho tshuab lub zog, ya raws barrier, gas barrier thiab tsis zoo hnyav hnyav. Cov qauv molecular tsis tu ncua, cov degree ntawm crystallinity (55% ~ 65%) yog qhov tsawg, lub crystal melting point (108 ~ 126 ℃) kuj yog tsawg.

Ntim thiab khaws cia

Cov khoom yog ntim rau hauv polyethylene rov ntim zaj duab xis hnab, uas tuaj yeem ntim nrog polypropylene woven hnab raws li tus neeg siv' s yuav tsum tau. Cov khoom yuav tsum tau muab khaws cia rau hauv ib qho chaw huv thiab qhuav, uas tuaj yeem thauj tau los ntawm tsheb ciav hlau, tsheb thiab nkoj. Kev khaws cia thiab kev thauj mus los yuav tsum tau ua tib zoo saib xyuas hluav taws, dej, hnub, plua plav thiab kev tiv thaiv kev ua qias tuaj. Cov kev thauj mus los yuav tsum tau ua kom huv si thiab qhuav. Yuav tsum tsis txhob muaj cov khoom ntse xws li cov ntsia hlau,

• LLDPE

(LLDPE) yog ib tug high-pressure los yog low-pressure polymerization ntawm ethylene nrog ib tug me me ntawm siab alpha-olefins (xws li butene-1, hexene-1, octene-1, tetramethylpentene-1, thiab lwm yam) nyob rau hauv qhov kev txiav txim ntawm ib tug catalyst ntom ntawm 0.915 ~ 0.940 g / cubic centimeter. Txawm li cas los xij, raws li ASTM D-1248-84, 0.926 ~ 0.940 g / cm3 density range yog nruab nrab ntom polyethylene (MDPE). Lub cim tshiab ntawm LLDPE nthuav dav nws qhov ntom ntom rau plastomers (0.890 txog 0.915 g / cm3) thiab elastomers (< 0.890="" g="" cm3).="" txawm="" li="" cas="" los="" xij,="" spi="" thiab="" apc="" tsuas="" yog="" hu="" ua="" lldpe'="" qhov="" ntau="" ntawm="" union="" carbide="" thiab="" dow="" chemical="" company="" rau="" lawv="" cov="" muag="" khoom="" ua="" ntej="" ntawm="" plastomers="" thiab="" elastomers="" raws="" li="" tsawg="" ntom="" ntom="" polyethylene="" (vldpe)="" thiab="" ultra="" low="" density="" polyethylene="" (tsis="" suav="" elastomer)="" uldpe="" )="" cov="">

Cov qauv molecular ntawm cov pa LLDPE yog tus cwj pwm los ntawm nws cov kab mob qaum, nrog ob peb lossis tsis ntev ceg, tab sis nrog qee cov ceg luv. Tsis ntev saw caj dab ua rau cov polymers ntau crystalline.

Feem ntau, LLDPE resins yog tus cwj pwm los ntawm qhov ntom ntom thiab yaj qhov ntsuas. Qhov ceev yog txiav txim los ntawm qhov concentration ntawm comonomer hauv cov saw hlau polymer. Qhov concentration ntawm comonomer txiav txim siab tus nqi ntawm cov ceg luv luv hauv cov polymer. Qhov ntev ntawm cov saw luv luv yog nyob ntawm hom comonomer. Qhov siab dua qhov comonomer concentration, qis dua qhov ntom ntawm cov resin. Tsis tas li ntawd, lub melt index yog ib qho kev xav ntawm qhov nruab nrab molecular hnyav ntawm cov resin thiab feem ntau yog txiav txim siab los ntawm cov tshuaj tiv thaiv kub (txoj kev daws teeb meem) thiab ntxiv cov saw hloov mus rau tus neeg sawv cev (gas theem txoj kev). Qhov nruab nrab qhov hnyav molecular tsis muaj dab tsi cuam tshuam nrog qhov hnyav molecular faib, uas feem ntau cuam tshuam los ntawm hom catalyst.

Kev lag luam ntawm LLDPE los ntawm Union Carbide nyob rau xyoo 1970 tau sawv cev rau kev hloov pauv loj hauv polyethylene catalysts thiab txheej txheem thev naus laus zis, uas ua rau muaj kev nthuav dav ntawm cov khoom lag luam polyethylene. tus nqi ntawm cov hluav taws xob qis-theem polymerization es tsis txhob siv lub tshuab hluav taws xob high-pressure reactor, nyob rau lub sijhawm luv luv, nrog nws cov kev ua tau zoo thiab cov nqi qis, tau hloov LDPE hauv ntau qhov chaw. Tam sim no, LLDPE nkag mus yuav luag txhua lub khw muag khoom polyethylene, suav nrog zaj duab xis, molding, yeeb nkab thiab xaim thiab cable.

LLDPE cov khoom tsis muaj tshuaj lom, tsis qab, tsis muaj ntxhiab, muaj kua mis dawb. Piv nrog LDPE, nws muaj qhov zoo ntawm lub zog siab, zoo toughness, muaj zog rigidity, kub tsis kam thiab txias tsis kam. Nws kuj tseem muaj kev tiv thaiv zoo rau ib puag ncig kev ntxhov siab tawg, rhuav lub zog thiab lwm yam khoom, thiab cov kua qaub, alkali, organic solvents.