Cov ntaub qhwv los yog cov ntaub qhwv sab nrauv yog txheej txheej tiv thaiv sab nraud hauv cov qauv kho qhov muag, feem ntau yog ua los ntawm PE sheath khoom thiab PVC sheath khoom, thiab halogen-dawb nplaim-retardant sheath khoom thiab hluav taws xob nrhiav resistant sheath khoom siv nyob rau hauv tshwj xeeb zaus.
1. PE sheath khoom
PE yog lub npe luv ntawm polyethylene, uas yog ib qho polymer compound tsim los ntawm polymerization ntawm ethylene. Cov khoom siv polyethylene dub yog tsim los ntawm kev sib xyaw ua ke thiab granulating polyethylene resin nrog stabilizer, carbon dub, antioxidant thiab plasticizer nyob rau hauv ib qho kev faib ua feem. Polyethylene sheath cov ntaub ntawv rau optical cable sheaths yuav muab faib ua low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE) thiab high-density polyethylene (HDPE) raws li qhov ceev. Vim lawv qhov sib txawv ntom ntom thiab cov qauv molecular, lawv muaj cov khoom sib txawv. Tsawg-density polyethylene, tseem hu ua high-pressure polyethylene, yog tsim los ntawm copolymerization ntawm ethylene ntawm kev kub siab (siab tshaj 1500 atmospheres) ntawm 200-300 ° C nrog oxygen ua catalyst. Yog li ntawd, cov saw hlau molecular ntawm low-density polyethylene muaj ntau ceg ntawm qhov ntev sib txawv, nrog rau qib siab ntawm cov saw caj dab, cov qauv tsis sib xws, tsis tshua muaj crystallinity, thiab zoo elasticity thiab elongation. High-density polyethylene, tseem hu ua low-pressure polyethylene, yog tsim los ntawm polymerization ntawm ethylene ntawm qis siab (1-5 atmospheres) thiab 60-80 ° C nrog txhuas thiab titanium catalysts. Vim qhov nqaim molecular hnyav faib ntawm high-density polyethylene thiab cov txheej txheem ntawm cov molecules, nws muaj cov khoom siv zoo, tshuaj lom neeg ua haujlwm zoo thiab kev siv ntau yam kub. Medium-density polyethylene sheath khoom yog tsim los ntawm kev sib xyaw high-density polyethylene thiab low-density polyethylene nyob rau hauv ib qho kev faib ua feem, los yog los ntawm polymerizing ethylene monomer thiab propylene (los yog lub thib ob monomer ntawm 1-butene). Yog li ntawd, qhov kev ua tau zoo ntawm nruab nrab-density polyethylene yog nruab nrab ntawm high-density polyethylene thiab low-density polyethylene, thiab nws muaj ob qho tib si yooj yooj yim ntawm low-density polyethylene thiab zoo heev hnav tsis kam thiab tensile zog ntawm high-density polyethylene. Linear low-density polyethylene is polymerized by low-pressure gas phase or solution method with ethylene monomer and 2-olefin. Lub Ceging degree ntawm linear tsawg-ceev polyethylene yog nruab nrab ntawm qis ntom thiab siab ntom, yog li nws muaj kev nyuaj siab zoo heev tawg. Environmental stress cracking resistance yog ib qho tseem ceeb heev rau kev txheeb xyuas qhov zoo ntawm PE cov ntaub ntawv. Nws yog hais txog qhov tshwm sim uas cov khoom kuaj cov khoom raug khoov kev ntxhov siab tawg hauv ib puag ncig ntawm surfactant. Cov yam ntxwv cuam tshuam rau kev ntxhov siab ntawm cov khoom muaj xws li: molecular hnyav, molecular hnyav faib, crystallinity, thiab microstructure ntawm molecular saw. Qhov loj dua qhov hnyav molecular, qhov nqaim ntawm qhov hnyav molecular faib, ntau qhov sib txuas ntawm cov wafers, qhov zoo dua qhov kev ntxhov siab ib puag ncig ntawm cov khoom siv, thiab lub neej ntev ntawm cov khoom siv; tib lub sijhawm, crystallization ntawm cov khoom kuj cuam tshuam rau qhov ntsuas no. Qhov qis dua qhov crystallinity, qhov zoo dua qhov kev ntxhov siab ib puag ncig cracking kuj ntawm cov khoom. Lub zog tensile thiab elongation ntawm kev tawg ntawm PE cov ntaub ntawv yog lwm qhov taw qhia los ntsuas qhov ua tau zoo ntawm cov khoom, thiab tuaj yeem kwv yees qhov kawg ntawm cov khoom siv. Cov ntsiab lus carbon hauv PE cov ntaub ntawv tuaj yeem tiv thaiv kev yaig ntawm ultraviolet rays ntawm cov khoom, thiab antioxidants tuaj yeem txhim kho cov khoom antioxidant ntawm cov khoom.
2. PVC sheath khoom
PVC nplaim taws retardant khoom muaj chlorine atoms, uas yuav hlawv nyob rau hauv cov nplaim taws. Thaum hlawv, nws yuav decompose thiab tso tawm ib tug loj npaum li cas ntawm corrosive thiab lom HCL roj, uas yuav ua rau lwm yam kev puas tsuaj, tab sis nws yuav tua nws tus kheej thaum tawm hauv lub nplaim taws, yog li nws muaj cov yam ntxwv ntawm tsis kis nplaim taws; Nyob rau tib lub sijhawm, cov khoom siv PVC sheath muaj qhov yooj yooj yim thiab extensibility, thiab yog siv dav hauv cov khoom siv kho qhov muag hauv tsev.
3. Halogen-dawb nplaim retardant sheath khoom
Txij li thaum polyvinyl chloride yuav tsim cov pa roj carbon monoxide thaum hlawv, tib neeg tau tsim cov pa luam yeeb tsawg, tsis muaj halogen, tsis muaj tshuaj lom, cov khoom siv hluav taws xob huv si, uas yog, ntxiv cov nplaim hluav taws tsis zoo Al (OH) 3 thiab Mg (OH) 2. rau cov ntaub ntawv sheath zoo tib yam, uas yuav tso cov dej siv lead ua thaum ntsib hluav taws thiab nqus cua sov ntau, yog li tiv thaiv qhov kub ntawm cov ntaub qhwv los ntawm kev nce thiab tiv thaiv combustion. Txij li cov nplaim hluav taws tsis muaj hluav taws xob ntxiv rau cov khoom siv hluav taws xob tsis muaj hluav taws xob halogen, cov conductivity ntawm polymers yuav nce. Nyob rau tib lub sij hawm, resins thiab inorganic nplaim retardants yog txawv kiag li ob-theem cov ntaub ntawv. Thaum ua tiav, nws yog ib qho tsim nyog los tiv thaiv kev sib xyaw tsis sib xws ntawm cov nplaim hluav taws xob hauv zos. Inorganic nplaim retardants yuav tsum tau ntxiv nyob rau hauv tus nqi tsim nyog. Yog tias qhov kev faib ua feem loj dhau lawm, lub zog txhua yam thiab elongation ntawm cov khoom tawg yuav raug txo kom tsawg. Cov ntsuas ntsuas rau kev ntsuas cov nplaim hluav taws kub ntawm cov nplaim hluav taws tsis muaj halogen yog cov pa ntsuas pa thiab cov pa taws. Cov pa oxygen index yog qhov tsawg kawg nkaus oxygen concentration xav tau rau cov khoom siv kom muaj kev sib xyaw ua ke hauv cov pa sib xyaw ntawm oxygen thiab nitrogen. Qhov loj dua qhov ntsuas cov pa oxygen, qhov zoo dua cov nplaim retardant ntawm cov khoom. Cov pa luam yeeb concentration yog xam los ntawm kev ntsuas qhov xa tawm ntawm lub teeb sib luag ntawm lub teeb ci dhau los ntawm cov pa luam yeeb uas tsim los ntawm kev sib xyaw ntawm cov khoom hauv ib qho chaw thiab qhov chaw kho qhov muag ntev. Qhov qis dua cov pa luam yeeb concentration, cov pa luam yeeb tsawg dua thiab cov khoom siv tau zoo dua.
4. Hluav taws xob cim resistant sheath khoom
Muaj ntau thiab ntau tshaj tawm txhua qhov kev txhawb nqa tus kheej kho qhov muag cable (ADSS) tso rau hauv tib lub pej thuam nrog cov kab hluav taws xob siab tshaj plaws hauv kev sib txuas lus hluav taws xob. Yuav kom kov yeej cov kev cuam tshuam ntawm high voltage induction hluav taws xob teb ntawm cable sheath, tib neeg tau tsim thiab tsim ib qho tshiab hluav taws xob caws pliav resistant sheath khoom, cov ntaub qhwv los ntawm nruj tswj cov ntsiab lus ntawm cov pa roj carbon dub, qhov loj thiab kev faib tawm ntawm cov pa roj carbon dub. , ntxiv tshwj xeeb additives los ua cov ntaub ntawv sheath muaj zoo heev hluav taws xob caws pliav resistant kev kawm.
Post lub sij hawm: Aug-26-2024