Yuav ua li cas xaiv cov khoom siv polyethylene rau cables? Kev sib piv ntawm LDPE / MDPE / HDPE / XLPE

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Yuav ua li cas xaiv cov khoom siv polyethylene rau cables? Kev sib piv ntawm LDPE / MDPE / HDPE / XLPE

Polyethylene Synthesis Methods thiab Ntau Yam

(1) Tsawg-Density Polyethylene (LDPE)

Thaum muaj cov pa oxygen lossis peroxides ntxiv los ua cov neeg pib rau cov ethylene ntshiab, compressed rau kwv yees li 202.6 kPa, thiab cua sov txog li 200 ° C, cov ethylene polymerizes rau hauv dawb, waxy polyethylene. Txoj kev no feem ntau hu ua cov txheej txheem siab vim yog kev ua haujlwm. Cov txiaj ntsig polyethylene muaj qhov ntom ntawm 0.915-0.930 g / cm³ thiab qhov hnyav ntawm molecular li ntawm 15,000 txog 40,000. Nws cov qauv molecular yog cov ceg tawv heev thiab xoob, zoo li "zoo li tsob ntoo" kev teeb tsa, uas suav rau nws qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom polyethylene.

(2) Medium-Density Polyethylene (MDPE)

Cov txheej txheem nruab nrab-siab muaj xws li polymerizing ethylene nyob rau hauv 30-100 atmospheres siv hlau oxide catalysts. Cov txiaj ntsig polyethylene muaj qhov ntom ntawm 0.931-0.940 g / cm³. MDPE kuj tseem tuaj yeem tsim los ntawm kev sib xyaw ua ke ntawm high-density polyethylene (HDPE) nrog LDPE lossis los ntawm copolymerization ntawm ethylene nrog comonomers xws li butene, vinyl acetate, lossis acrylates.

(3) High-density Polyethylene (HDPE)

Nyob rau hauv ib txwm kub thiab siab tej yam kev mob, ethylene yog polymerized siv zoo heev coordination catalysts (organometallic tebchaw muaj li ntawm alkylaluminum thiab titanium tetrachloride). Vim tias muaj kev ua haujlwm siab catalytic, cov tshuaj tiv thaiv polymerization tuaj yeem ua tiav sai sai ntawm qhov tsis tshua muaj siab (0-10 atm) thiab qhov kub thiab txias (60-75 ° C), yog li lub npe hu ua cov txheej txheem qis. Cov txiaj ntsig polyethylene muaj cov qauv tsis sib xws, cov qauv tsim tawm, ua rau nws qhov ntom ntom (0.941-0.965 g / cm³). Piv rau LDPE, HDPE nthuav tawm cov cua sov ua haujlwm zoo dua, cov khoom siv kho tshuab, thiab ib puag ncig kev ntxhov siab-tawg tsis kam.

Cov khoom ntawm Polyethylene

Polyethylene yog ib qho mis-dawb, wax-zoo li, semi-pob tshab yas, ua rau nws zoo tagnrho rwb thaiv tsev thiab sheathing khoom rau cov xov hlau thiab cables. Nws cov txiaj ntsig tseem ceeb suav nrog:

(1) Cov khoom siv hluav taws xob zoo heev: kev rwb thaiv tsev siab thiab lub zog dielectric; Tsawg permittivity (ε) thiab dielectric poob tangent (tanδ) thoob plaws ntau zaus, nrog tsawg zaus dependence, ua rau nws ze li qhov zoo tagnrho dielectric rau kev sib txuas lus cables.

(2) Zoo txhua yam khoom: hloov tau yooj yim tsis tau tawv, nrog zoo deformation kuj.

(3) Muaj zog tiv thaiv thermal aging, low-temperature brittleness, thiab tshuaj stability.

(4) Kev tiv thaiv dej zoo heev nrog kev nqus dej tsawg; Kev tiv thaiv kev tiv thaiv feem ntau tsis txo qis thaum immersed hauv dej.

(5) Raws li cov khoom siv tsis-polar, nws nthuav tawm cov roj permeability siab, nrog LDPE muaj cov roj permeability siab tshaj plaws ntawm cov yas.

(6) Tsawg lub ntiajteb txawj nqus, tag nrho hauv qab 1. LDPE tshwj xeeb tshaj yog nyob ntawm kwv yees li 0.92 g / cm³, thaum HDPE, txawm tias nws qhov ceev dua, tsuas yog nyob ib ncig ntawm 0.94 g / cm³.

(7) Kev ua haujlwm zoo: yooj yim rau yaj thiab plasticize yam tsis muaj decomposition, txias yooj yim rau hauv cov duab, thiab tso cai rau kev tswj xyuas cov khoom geometry thiab qhov ntev.

(8) Cables ua nrog polyethylene yog lub teeb yuag, yooj yim rau nruab, thiab yooj yim rau kev txiav. Txawm li cas los xij, polyethylene kuj tseem muaj ob peb qhov tsis zoo: qhov kub tsis tshua muaj softening; flammability, emitting ib tug zoo li paraffin tsw thaum hlawv; tsis zoo ib puag ncig kev nyuaj siab-cracking kuj thiab creep kuj. Yuav tsum tau saib xyuas tshwj xeeb thaum siv polyethylene ua rwb thaiv tsev los yog sheathing rau submarine cables los yog cables ntsia rau hauv txoj kab ntsug ntsug.

Polyethylene Plastics rau Hlau thiab Cables

(1) General-Purpose Rwb thaiv tsev Polyethylene yas
Tsim los ntawm polyethylene resin thiab antioxidants.

(2) Huab cua-Resistant Polyethylene yas
Feem ntau yog tsim los ntawm polyethylene resin, antioxidants, thiab carbon dub. Huab cua tsis kam nyob ntawm qhov loj me, cov ntsiab lus, thiab dispersion ntawm carbon dub.

(3) Environmental Stress-Crack Resistant Polyethylene Yas
Siv polyethylene nrog lub melt flow index qis dua 0.3 thiab nqaim molecular hnyav tis. Cov polyethylene kuj tseem tuaj yeem cuam tshuam los ntawm irradiation lossis chemical method.

(4) High-Voltage rwb thaiv tsev polyethylene yas
High-voltage cable rwb thaiv tsev yuav tsum tau ultra-ntshiab polyethylene yas, ntxiv nrog voltage stabilizers thiab tshwj xeeb extruders los tiv thaiv void tsim, suppress resin paug, thiab txhim kho arc kuj, hluav taws xob yaig kuj, thiab corona kuj.

(5) Semiconductive Polyethylene Yas
Ua los ntawm kev ntxiv cov pa roj carbon dub rau polyethylene, feem ntau yog siv cov nplua-particle, high-structure carbon dub.

(6) Thermoplastic Low-Smoke Zero-Halogen (LSZH) Polyolefin Cable Compound

Cov khoom siv no siv cov khoom siv polyethylene los ua cov khoom siv hauv paus, suav nrog cov nplaim hluav taws xob tsis muaj hluav taws xob zoo halogen, cov pa luam yeeb, cov thermal stabilizers, cov tshuaj tua kab mob, thiab cov xim, ua tiav los ntawm kev sib xyaw, plasticization, thiab pelletization.

Crosslinked Polyethylene (XLPE)

Nyob rau hauv qhov kev txiav txim ntawm high-zog hluav taws xob hluav taws xob los yog crosslinking agents, linear molecular qauv ntawm polyethylene transforms mus rau hauv ib tug peb-dimensional (network) qauv, hloov cov khoom siv thermoplastic rau hauv ib lub thermoset. Thaum siv los ua rwb thaiv tsev,XLPEtuaj yeem tiv taus qhov kub thiab txias mus txog 90 ° C thiab luv-circuit kub ntawm 170-250 ° C. Crosslinking txoj kev muaj xws li lub cev thiab tshuaj crosslinking. Irradiation crosslinking yog ib txoj hauv kev siv lub cev, thaum cov tshuaj sib txuas sib txuas ntau tshaj plaws yog DCP (dicumyl peroxide).

 


Lub sij hawm xa tuaj: Plaub Hlis-10-2025