1. Pib
Eva yog cov lus luv rau Ethylene vinyl acetate copolymer, ib polyolefin polymer. Vim tias nws cov khoom siv kub qis, zoo nkauj thiab cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob, yog li cov khoom siv hluav taws xob, thiab muaj peev xwm siv tau ua cable cov muab tub lim, cov khoom siv sheathing; tuaj yeem ua rau hauv cov khoom siv thermoplastic, thiab tuaj yeem ua rau hauv thermosetting hla cov khoom siv.
Eva ntau txoj kev siv, nrog nplaim taws retardants, tuaj yeem ua rau hauv cov pa luam yeeb qis-dawb lossis halogen roj teeb; Xaiv cov ntsiab lus siab VA cov ntsiab lus ntawm Eva ua cov khoom siv hauv paus kuj tseem tuaj yeem ua rau cov roj-resistant; Xaiv lub Melt Performance index ntawm kev hloov kho EVA, ntxiv 2 txog 3 zaug ntawm cov txheej txheem Retusants tuaj yeem ua rau cov txheej txheem sib tw ua haujlwm ntxiv (sau) cov khoom siv.
Hauv daim ntawv no, los ntawm cov txheej txheem ntawm EVA, kev qhia ntawm nws daim ntawv thov hauv kev lag luam cable thiab kev txhim kho cov kev cia siab.
2. Cov Khoom Siv Hluav Taws Xob
Thaum ua synthesis, hloov cov kev sib piv ntawm polymerisation degree N / m tuaj yeem tsim cov ntsiab lus VA los ntawm 5 txog 90% ntawm EVA; nce tag nrho polymerisation degree tuaj yeem tsim cov molecular hnyav los ntawm kaum tawm txhiab rau ntau pua txhiab Eva; VA cov ntsiab lus hauv qab 40%, vim muaj qee feem me me crystallisation, tsis zoo elasticity, feem ntau yog hu ua EVA yas; Thaum lub VA cov ntsiab lus yog ntau dua 40%, cov roj hmab zoo li Elastomer yam tsis muaj Crystallisation, feem ntau yog hu ua Evm roj hmab.
1. 2 lub zog
Cov qauv molecular ntawm EVA yog txoj kab ua qauv zoo, yog li nws muaj kev laus tshav kub zoo, huab cua thiab ozone kuj.
Eva molecule tseem ceeb saw tsis muaj ob chav khi, benzene port, cov pab pawg benine thiab lwm cov pab pawg kuj tseem tsis tau haus luam yeeb thaum hlawv cov methyl, cenyl, cyano thiab lwm pab pawg. Tsis tas li ntawd, cov molecule nws tus kheej tsis muaj halogen ntsiab, yog li nws yog tshwj xeeb rau cov pa luam yeeb qis-dawb tiv taus roj.
Qhov loj me ntawm vinyl acetate (va) pawg hauv EVA sab saw thiab nws ob leeg sib txawv ntawm cov khoom siv roj hmab, uas tsim cov xwm txheej rau kev ua tau zoo ntawm cov roj hmab. Qhov no muaj tseeb tshwj xeeb rau cov pa taws thiab halogen-dawb tiv taus, raws li cov nplaim hluav taws xob (huag) 3, thiab lwm yam ntawm cov qauv cable. Eva nrog ib qho nruab nrab rau cov ntsiab lus VA siab yog siv los ua lub hauv paus los tsim cov nplaim taws thiab cov nplaim hluav taws xob tsis tshua muaj roj.
Raws li Eva tog saw Vinyl acetate pab pawg (va) yog ntau dua VA cov ntsiab lus, ntau dua cov roj ntsha yog thiab qhov zoo dua cov roj tsis kam. Cov roj ua kom tsis kam los ntawm kev lag luam cable feem ntau yog hais txog kev muaj peev xwm tiv taus tsis tau withstand tsis yog-polar lossis tsis muaj zog polar cov roj av. Raws li lub hauv paus ntsiab lus ntawm cov ntsiab lus zoo sib xws, EVA nrog cov khoom siv siab yog siv los ua cov pa hluav taws thiab halogen-dawb roj tsis kam.
Eva molecules nyob rau hauv lub alpha-olfefles nyob rau atom kev ua tau zoo dua, hauv kev sib txuas hluav taws xob, ua kom xav tau cov tshuaj tiv thaiv hluav taws xob nrog, ua kom xav tau cov hlau tshwj xeeb thiab cov ntaub ntawv cable.
Qhov sib ntxiv ntawm Vinyl acetate pab pawg ua rau cov yaj ntawm Eva Yog li ntawd, nws txoj kev kawm extrusion zoo dua li cov qauv molecular ntawm cov khoom siv zoo sib xws rau cov ntaub ntawv zoo sib xws thiab Halogen thiab Halogen-dawb roj teeb.
2 Khoom Muag Zoo
2. 1 Tsis Muaj Peev Xwm Zej Zog
Yu lub cev thiab cov kws kho tshuab, cua sov kuj, huab cua tsis kam, ozone kuj, hluav taws xob ua tau zoo heev. Xaiv cov qib tsim nyog, tuaj yeem ua kom sov tsis kam, nplaim taws retardant kev ua tau zoo, tab sis kuj roj, cov kuab tshuaj tshwj xeeb cable cov khoom siv.
Thermoplastic EVA cov ntaub ntawv siv nrog VA cov ntsiab lus ntawm 15% mus rau 46%, nrog rau 4 qib. Eva muaj ntau cov tuam ntxhab, ntau hom, ntau qhov kev xaiv, tus nqi uas txaus, qhov chaw txaus, koj xaiv tau, yooj yim heev.
Eva yog polyolefin poly cymer, los ntawm qhov muag muag thiab siv kev sib piv ua tau zoo, thiab polyethylene (p_vinyl chloride (pvc) cov khoom siv cable zoo sib xws. Tab sis kev tshawb fawb ntxiv, koj yuav pom Eva thiab cov saum toj no ob hom khoom siv piv nrog cov irreplaceable superiority.
2. 2 Kev Ua Tau Zoo Tshaj
EVA hauv Cable application yog los ntawm nruab nrab thiab siab voltage cable tiv thaiv cov khoom sab hauv thiab sab nraud thaum chiv keeb, thiab tom qab txuas mus rau Halogen-dawb roj teeb. Ob hom khoom siv los ntawm kev ua tus saib pom tias yog "cov khoom siv viscosity vim yog cov khoom siv viscosity ntau dua, cov ua kom tiav; Halogen-dawb nplaim retardant Roj yuav tsum tau ntxiv cov nplaim hluav taws xob ntau, kuj halogen-dawb cov kab viscosity ntau dua, cov ua kua tsawg. Kev daws teeb meem yog nrhiav kom pom cov polymer uas tuaj yeem haum cov tshuaj uas muaj cov muab tub lim, tab sis kuj muaj cov viscort tsawg tsawg thiab muaj kua zoo. Vim li no, EVA yog qhov kev xaiv uas xav tau.
Eva yaj viscosity nrog extrusion ua kev ua kom sov thiab shear tus nqi yuav nce cov extruder poob sai sai, koj tuaj yeem ua tau zoo ntawm xaim thiab cable cov khoom. Cov ntawv thov hauv tsev ntau thiab txawv teb chaws qhia tau tias, rau cov khoom siv luam yeeb tsawg dhau, yog li tsuas yog siv cov pa luam yeeb tsawg dhau, yog li kom paub meej tias zoo extrusion zoo. Cov roj hmab-raws li cov neeg sawv cev phom nrog cov neeg sawv cev ntawm cov roj hmab extruders thiab dav dav lub hom phiaj extruders. Cov txheej txheem tom qab (hla kev sib txuas) tuaj yeem nqa tawm ntawm thermochemical (peroxide (peroxide) hla kev sib txuas lossis nrawm irradiat hla kev.
2. 3 Yooj yim hloov kho thiab hloov kho
Cov xov hlau thiab cab cab yog qhov txhia chaw, saum ntuj mus rau hauv av, los ntawm roob mus rau lub hiav txwv. Cov neeg siv ntawm xaim thiab cable yuav tsum tau sib txawv thiab coj txawv txawv, thaum tus qauv sib txawv yog qhov tshwj xeeb los cuam tshuam rau hauv cov ntaub ntawv rwb thaiv tsev thiab ntaub qhwv ntsej muag.
Txog tam sim no, ob qho tib si hauv tsev thiab txawv teb chaws, mos muag lossis suav nyiaj rau feem coob ntawm cov ntaub ntawv polymer siv hauv kev lag luam cable. Txawm li cas los xij, nrog kev paub txog kev paub txog kev tiv thaiv ib puag ncig thiab kev txhim kho kom ruaj khov.
PVC cov ntaub ntawv tau raug txwv ntau heev, cov kws tshawb fawb tau ua txhua yam ua tau kom nrhiav tau cov ntaub ntawv xaiv rau PVC, cov lus cog tseg tshaj plaws ntawm Eva.
EVA tuaj yeem sib xyaw nrog ntau hom qoob loo, tab sis kuj muaj ntau cov khoom ntxhia thiab cov khoom siv ua ke tuaj yeem ua rau cov roj hmab txuas nrog roj hmab txuas ntxiv. Tsim cov neeg tsim qauv tuaj yeem ua raws cov neeg siv (lossis qauv), eva raws li cov khoom siv los ua kom tau raws li cov cai.
3 EVA daim ntawv thov ntau ntau
3. 1 Siv los ua cov ntaub thaiv cov ntaub thaiv npog rau high-voltage zog cable
Raws li peb txhua tus paub, cov khoom tseem ceeb ntawm cov ntaub ntawv tiv thaiv cov roj carbon dub, hauv cov roj hmab los ntxiv cov khoom siv ntawm cov khoom thaiv npog thiab cov du ntawm txoj kev zam. Txhawm rau tiv thaiv ib nrab ntawm kev tawm hauv cov hluav taws xob high-voltage, sab hauv thiab sab nraud ntawm cov ntaub thaiv thiab sab nraud yuav tsum yog nyias, ci, ci thiab hnav khaub ncaws. Piv rau lwm cov polymers, Eva tuaj yeem ua qhov no yooj yim dua. Qhov laj thawj rau qhov no yog EVA's Extrusion cov txheej txheem tshwj xeeb yog qhov tshwj xeeb, thiab tsis txaus ntshai, thiab tsis tshua muaj kev npau taws. Cov ntaub ntawv tiv thaiv tau muab faib ua ob pawg: qhwv hauv tus neeg xyuas pib sab nraud hu ua cov ntaub ntawv sab hauv - nrog cov ntaub ntawv sab hauv; qhwv hauv rwb thaiv tsev sab nraud hu ua cov ntaub thaiv sab nraud - nrog cov khoom siv sab nraud; Cov ntaub ntawv sab hauv feem ntau thermoplastic cov ntaub ntawv sab hauv feem ntau yog thermoplastic thiab feem ntau yog raws VA cov ntsiab lus ntawm 18% rau 28%; Lub vijtsam sab nraud yog feem ntau hla-txuas thiab cov ntaub ntawv patas thiab feem ntau yog raws li Eva nrog VA cov ntsiab lus ntawm 40% mus rau 46%.
3. 2 Thermopastic thiab hla-txuas nplaim taws ruardant fuels
Thermoplastic nplaim retardant polyolefin tau siv dav hauv kev lag luam cable, tsuas yog rau halogen lossis halogen-rables siv thiab qib siab tsim. Lawv cov sij hawm ua haujlwm ntev ntev los ntawm 70 txog 90 ° C.
Rau nruab nrab thiab siab voltage zog cables ntawm 10 kv thiab saum toj no, uas muaj hluav taws xob hluav taws xob zoo heev, cov nplaim hluav taws xob tau tsuas yog BEACE sheath. Nyob rau hauv qee qhov kev xav tau cov tsev lossis cov phiaj xwm, cov xaim hluav taws xob yuav tsum muaj cov pa hluav taws me, yog li thermoplastic nplaim retardant polyolefins yog cov tshuaj muaj peev xwm siv tau.
Rau qee lub hom phiaj tshwj xeeb, cov ntu sab nraud tsis yog qhov loj me, tab sis kuj muaj hluav taws xob nrawm da dej, tab sis kuj muaj hluav taws xob nrawm da dej Nws lub sijhawm ntev ua haujlwm kub tau muab faib ua 105, 125 ℃, ntau peb cov ntaub ntawv, ntawm peb cov ntaub ntawv sib txawv, cov qauv ntau thiab halogen-muaj roj teeb.
Nws yog qhov paub zoo uas polyolefins tsis yog-ncej lossis tsis muaj zog ncov qaumteb qabteb. Raws li lawv tau zoo ib yam li cov roj ntxhia hauv polarity, polycenfins feem ntau tau txiav txim siab kom tsis tshua muaj roj raws li lub hauv paus raws li txoj cai sib xws. Txawm li cas los xij, ntau tus qauv cable hauv tsev thiab txawv teb chaws kuj tseem ua tau cov roj, cov kuab tshuaj thiab txawm tias cov roj slurries, acids thiab alkalis. Qhov no yog kev sib tw rau cov kws tshawb nrhiav, tam sim no, txawm tias nyob hauv Suav teb lossis txawv teb chaws, cov ntaub ntawv thov tau tsim yog Eva.
3. 3 Cov Khoom Pa Oxygen Teeb Meem
Stranded Cov Cable Multi-core cabs muaj ntau voids ntawm cov cores uas yuav tsum tau ua kom muaj kev sib dhos nyob rau hauv lub sheath sib npaug, yog ua los ntawm halogen-dawb roj teeb. Qhov kev ua tiav txheej no ua cov nplaim hluav taws (oxygen) thaum lub cable kub thiab yog li ntawd hu ua "oxygen barrier" hauv kev lag luam.
Cov khoom siv yooj yim rau cov khoom siv pa oxygen cov khoom siv, cov nplaim paj zoo tshaj plaws
Qhov kev ntsuas oxygen no tau siv ntau dua hauv kev lag luam cable ntau dua ib xyoo caum thiab tau coj mus rau qhov tseem ceeb txhim kho hauv cov nplaim hluav taws xob ntawm cables. Cov txheej txheem oxygen yuav siv tau rau cov nplaim taws dawb-retardant cables thiab halogen-retardant cables-retardant cables-retardant cables-retardant cables-retardant cables-retardant cables-retardant cables-retardant cables Qhov kev coj ua loj loj tau qhia tias cables nrog cov pa oxygen feem ntau yuav tsum dhau ib co ntsug kev hlawv thiab pob ntsuas hlawv.
Los ntawm qhov pom ntawm cov khoom tsim, cov khoom siv oxygen no (OL ultra) ntawm Mg (Oh))
3. 4 Hloov PE sheathing cov khoom
Polyethylene cov ntaub ntawv yog nquag mus rau ob qho teeb meem: Firstly, lawv tau nquag mus rau yaj beakage (piv txwv li sharkskinin) thaum lub sijhawm extrusion; Thib ob, lawv nquag nquag kev ntxhov siab ib puag ncig kev ntxhov siab. Qhov kev daws teeb meem yooj yim yog ntxiv rau qee feem ntawm eva hauv kev tsim qauv. Siv raws li hloov kho EVA feem ntau yog siv va cov ntsiab lus tsawg ntawm qib, nws cov melt index mus rau ntawm 1 txog 2 yog qhov tsim nyog.
4. Kev txhim kho vaj tswv yim
(1) Eva tau siv dav hauv kev lag luam cable, qhov nyiaj txhua xyoo nyob rau hauv chav kawm maj mam thiab muaj kev loj hlob. Tshwj xeeb tshaj yog nyob rau hauv kaum xyoo dhau los, vim yog qhov tseem ceeb ntawm kev tiv thaiv ib puag ncig, Eva raws li kev loj hlob sai, thiab muaj ib nrab hloov cov khoom sib txuas cable. Nws cov nqi zoo heev kev ua tau zoo thiab kev ua tau zoo ntawm cov txheej txheem extrusion yog qhov nyuaj los hloov lwm yam ntaub ntawv.
(2) Kev Lag Luam Kev Lag Luam Txhua Xyoo ntawm Eva Resin Ntau Hom, thiab yog li yuav tsis yog EVA kev lag luam giant qhauj. Piv txwv li, qhov loj tshaj plaws ntawm Falogen-dawb nplaim retardant cov khoom siv, qhov kev xaiv ntawm VA / MI = 28/2 ~ 3 Dupont's EMA 265 #). Thiab qib kev qhia tshwj xeeb ntawm EVA kom deb li deb tau muaj cov tuam ntxhab hauv tsev los tsim thiab muab. Tsis hais kom hais txog VA cov ntsiab lus siab dua 28, thiab yaj tau tsawg dua 3 ntawm lwm yam EVA resin ntau lawm thiab muab.
(3) Cov tuam txhab txawv teb chaws uas tsim Eva vim tias tsis muaj kev sib tw hauv tsev, thiab tus nqi tau ntev tau ntev, hnyav suprpressic cable txaus siab ntau lawm. Ntau tshaj 50% ntawm VA cov ntsiab lus ntawm roj hmab-hom evm, yog tus nqi txawv teb chaws dominated, thiab tus nqi zoo ib yam li VA cov ntsiab lus ntawm cov hom 2 txog 3 zaug. Xws li tus nqi siab, nyob rau hauv lem, tseem cuam tshuam rau cov nyiaj ntawm cov roj hmab hom eva, yog li kev lag luam cable kev lag luam, txhawm rau txhim kho tus nqi ntawm kev tsim khoom hauv eva. Ntau lawm ntawm kev lag luam tau muaj ntau ntawm kev siv ntawm Eva Resin.
(4) Kev vam khom yoj ntawm ib puag ncig kev tiv thaiv nyob rau hauv lub sij hawm ntawm kev tiv thaiv ib puag ncig, EVa tau txiav txim siab los ntawm kev lag luam cable rau ib puag ncig cov khoom siv hauv cov roj ua kom zoo ib puag ncig. Kev siv ntawm Eva tau loj hlob ntawm tus nqi ntawm 15% ib xyoos thiab qhov kev xam pom yog muaj kev cog lus heev. Tus nqi thiab kev loj hlob ntawm cov ntaub ntawv pov thaiv thiab cov hluav taws xob nruab nrab thiab siab tshaj plaws, kwv yees li 8% mus rau 10% ntawm; Polyolefin tsis kam loj dua, nyob rau hauv xyoo tsis ntev los no tau nyob rau ntawm 15% mus rau 20% ntawm, thiab hauv 10 xyoo, kuj tseem tuaj yeem tswj hwm tus nqi loj loj no.
Lub Sijhawm Post: Jul-31-2022