Tawm Polyethylene: Nws Yog Dab Tsi? Nta LLDPE (Tsawg Density) Thiab High Density Polyethylene

2024 Tus sau: Beatrice Philips | [email protected]. Kawg hloov kho: 2024-01-18 12:13

Polymers tau ua tiav hloov ntau yam ntawm cov ntaub ntawv uas peb tau siv, uas tau piav qhia los ntawm kev nrawm ntawm kev tsim khoom, tus nqi qis thiab tsis ntseeg qhov zoo.

Nws yog dab tsi?

Tawm polyethylene yog polymer uas, vim nws qhov ntau yam, tau siv hauv ntau qhov chaw. Cov khoom siv yog ua los ntawm elasticity, siab zog thiab ductility . Kev siv hom polymer no ua rau nws muaj peev xwm ua tiav cov cim tshwj xeeb hauv ntau yam lag luam - ob qho tib si hauv lub neej niaj hnub thiab hauv kev lag luam.

Kev tsim tawm ntawm polyethylene linear yog txheej txheem thev naus laus zis rau copolymerization ntawm ethylene thiab siab dua a-olefins siv cov catalysts tshwj xeeb. Thaum lub sijhawm tsim khoom, ethylene yog copolymerized nrog octene - C8, butene - C4, hexene - Sat . Hauv cov polymers ntawm hom no, muaj a -olefins yog 2.5 - 3.5 feem pua, qhov ntom yog los ntawm 0.915 txog 0.925 g / cm3. Qhov ntsuas no feem ntau txo qis raws li kev hwm rau kev loj hlob ntawm olefin saw. Copolymerization nrog hexene muab cov ceg tetrahydric ib sab, nrog butene - diatomic, nrog octene - hexahedral.

• Octene C8-LLDPE polyethylene yog nyob deb ntawm cov thev naus laus zis siab tshaj plaws thiab hom kim hauv kev sib piv rau hexene thiab butene. Lub cev lub cev ntawm C8-LLDPE ua rau nws muaj peev xwm siv nws hauv kev tsim cov yeeb yaj kiab ultra-thin, thaum txhua qhov zoo tau khaws cia hauv cov khoom tiav.
• Tawm Hexene LLDPE yog tus yam ntxwv los ntawm kev ua haujlwm thiab ua haujlwm ntev. Nws cov ceg txuas ntxiv txuas ntxiv muab lub zog yaj. Qhov no lav tau qhov faib txawm tias cov tuab tuab polymer thaum tsim khoom. Cov khoom tau txo cov tshuaj lom thiab muaj kev nyab xeeb ib puag ncig ntau dua li butene. Cov khoom lag luam rau kev lag luam khoom noj yog tsim los ntawm nws.
• Butene polyethylene - Qhov no yog hom kab polyethylene ntau tshaj plaws. Cov thev naus laus zis los tsim cov butene LLDPE yog qhov kev txhim kho ntxov tshaj plaws ntawm hom polymer no thiab ua rau nws cov khoom pheej yig tshaj hnub no.

Tawm qis siab polyethylene muaj ntau yam ntxwv zoo

• Cov khoom siv tsis tshua muaj zog tiv taus kinetic, cov khoom siv dag zog thiab poob siab.
• Kev tiv thaiv zoo heev rau UV rays.
• Kev ywj pheej ntawm LDL ua rau nws ua tau rau cov tuam ntxhab kom tau txais cov yeeb yaj kiab nyias thiab ultra-thin.
• Cov polymer muaj cov pa zoo heev thiab cov khoom tiv thaiv dej, uas ua kom ntseeg tau cov khoom cia ntev.
• Siab tsis kam rau ntau cov kuab tshuaj organic. Nws muaj peev xwm ua kom puas LDL nrog cov kua organic tsuas yog nyob ntawm qhov kub tshaj 60C.
• Cov kab hluav taws xob high-pressure polyethylene muaj cov yam ntxwv zoo ib yam li ntawm LDL, tab sis muaj qhov ua tau zoo dua: nws tiv taus ntau dua rau cov kuab tshuaj organic, cov khoom siv dag zog thiab kinetic. Piv rau cov tshuaj polyethylene uas tsis tshua muaj siab, cov tshuaj polymer siab siab yog cov yas tsawg dua, yog li ntawd, feem ntau cov khoom siv ntau txheej yog tsim los ntawm nws, uas ua rau nws muaj zog ntau ntxiv thiab tso cai rau nws siv rau kev ua haujlwm siab.

Qhov tsis zoo ntawm LLDPE tuaj yeem ua rau muaj kev nyab xeeb rau nws txoj kev ua haujlwm ntev - nws siv tau tsis tawg thiab xav tau kev siv cov thev naus laus zis tshwj xeeb rau kev pov tseg.

LDL cov txheej txheem tsim khoom

• Cov cuab yeej qub tshaj plaws roj-theem polymerization los ntawm txoj kev sib kis. Thaum tawm mus, cov ntaub ntawv tau txais uas yog qhov txawv los ntawm nws qhov kev coj dawb huv, tab sis muaj qhov sib txawv sib txawv.
• Txoj kev daws teeb meem yog txheej txheem thev naus laus zis uas siv qhov kub ntawm 60 txog 130C. Polyethylene ua nyob rau hauv ib txoj kev zoo sib xws tau nce ductility thiab cov khoom puas zoo. Qhov nyuaj ntawm txoj kev nyob hauv kev xaiv cov catalyst - ntawm qhov kub siab, ntau yam tshuaj zoo li ua rau muaj tshuaj lom tshuaj lom.
• Cov txheej txheem polymerization slurry cuam tshuam nrog kev siv cov slurry nrog ntxiv cov catalysts . Kev sib xyaw tas li ntawm cov muaj pes tsawg leeg yog qhov yuav tsum tau ua ntej rau kev tsim khoom. Cov khoom siv tau los ntawm kev siv cov thev naus laus zis no muaj cov qauv sib xws, tab sis sib txawv hauv kev nthuav tawm cov khoom ruaj khov.

Ethylene polymerization thev naus laus zis tau siv kom tau txais HDL. Hauv qhov no, peb tab tom tham txog qhov kub siab (los ntawm 700 txog 1800 C) thiab siab (los ntawm 25 txog 250 MPa). Txoj kev twg los xij ntawm kev npaj polymer siv, qhov kawg tshwm sim yog cov khoom siv me me. Yav tom ntej, nws xav tau kev kho cua sov.

Saib

Kev lag luam niaj hnub no tau siv dav rau qhov qis qis ntom polyethylene, feem ntau yog tsim khoom ntawm ntau hom yeeb yaj kiab

• Teb LDL tsis yog tshuaj lom neeg thiab feem ntau yog siv rau kev tsim cov ntim thiab tso tsheb hlau luam nrog qhov xav tau sib xws.
• Zaj duab xis polyethylene tau siv hauv kev tsim khoom ntawm ntau hom hnab nrog nce kev ywj pheej.
• Rau kev ntim cov khoom kub, siv hom tshuaj polyethylene, vim nws tau qhov txawv los ntawm nws cov elasticity thiab tiv taus kom ya raws thiab kub.
• Tawm qis ntom ntom LLDPE polyethylene yog tus yam ntxwv los ntawm cov qauv uas muaj cov ceg luv luv, siv hauv kev tsim cov yeeb yaj kiab nrog qis rau nruab nrab lub zog. Nws tau ua haujlwm ntawm qhov kub thiab txias li ntawm 20 txog 60C, thiab tseem muaj kev tiv taus te zoo. Siv rau kev tsim khoom ntim khoom noj.

LPVD muaj kev ywj pheej tsawg dua thiab nruj dua.

Nws yog siv rau kev tsim cov kav dej, cov ntim khoom lag luam thiab cov khoom lag luam hauv tsev uas muaj kev tiv thaiv siab rau tshuaj lom.

Cov ntawv thov

Lub hauv paus tseem ceeb ntawm daim ntawv thov yog kev tsim cov yeeb yaj kiab ntawm ntau hom, siv hauv daim ntawv ntawm kev ntxiv rau LDPE, HDPE, mloog zoo polymer dyes. Ib qho ntxiv, muaj lwm qhov kev thov:

• kev tsim cov kav dej thiab cov kav dej ntawm cov kav dej thiab hom dej;
• tsim cov ntaub qhwv thiab tsis-ntaub, xov thiab xov paj;
• tsuag thiab tshuab zaj duab xis ncab;
• rwb thaiv tsev cable, geomembranes, khoom ua npuas ncauj;
• khoom noj khoom haus, silage, ntsws zaj duab xis, hnab, pob khoom;
• casting ntawm qhov chaw pib, fittings, cov khoom siv phab ntsa nyias rau khoom noj thiab cov khoom lag luam uas tsis yog khoom noj.

Daim teb ntawm daim ntawv thov ntawm polyethylene linear yog qhov txawv txawv; cov khoom lag luam ntawm kev lag luam tshuaj no raug txiav txim siab ncaj ncees thiab suav nrog txhua qhov kev lag luam.