Cov ntaub ntawv hlau thiab cable tuaj yeem muab faib ua cov khoom siv hluav taws xob, cov ntaub ntawv insulating, cov ntaub ntawv tiv thaiv, cov ntaub thaiv npog, cov ntaub ntawv sau thiab lwm yam raws li lawv cov khoom siv thiab kev ua haujlwm.Raws li cov khoom siv, nws tuaj yeem muab faib ua hlau (tooj liab, txhuas, aluminium alloy, steel), yas (PVC, PE, PP, XLPE / XL-PVC, PU, ​​TPE / PO), roj hmab, thiab lwm yam. Tab sis qee qhov ntawm cov ntaub ntawv no muaj ntau rau ntau cov qauv.Tshwj xeeb tshaj yog cov ntaub ntawv thermoplastic, xws li polyvinyl chloride, polyethylene, tsuav yog qhov kev hloov ntawm ib feem ntawm cov mis yuav siv tau rau hauv rwb thaiv tsev los yog sheath.

Tom ntej no, peb qhia txog cov khoom siv uas tsis yog xim hlau thiab cov khoom siv cable

Ib qho, polyvinyl chloride (PVC)

PVC feem ntau yog siv los ua rwb thaiv tsev thiab cov khoom tiv thaiv.PVC li hlau thiab cable rwb thaiv tsev kev ua tau zoo: tsis yooj yim rau hlawv, laus tiv taus, roj tsis kam, tshuaj tiv thaiv, cuam tshuam tsis kam, xim yooj yim;Txawm li cas los xij, vim qhov loj dielectric tas li, nws feem ntau tsuas yog siv los ua cov khoom siv rwb thaiv tsev ntawm cov hluav taws xob qis thiab tswj cable.

PVC li hlau thiab cable sheath kev ua tau zoo: nrog zoo hnav tsis kam, tsis kam rau roj, acid, alkali, kab mob, ya raws thiab hnub ci, thiab nplaim hluav taws muaj kev tua tus kheej;PVC sheath muaj qhov tsawg kawg nkaus ua haujlwm kub ntawm -40 ° C thiab kub tsis kam ntawm 105 ° C.

Ob, polyethylene (PE)

PE cov khoom siv lub cev dav dav: dawb waxy, translucent, mos thiab tawv, me ntsis tuaj yeem ncab, lub teeb dua dej, tsis muaj tshuaj lom;Cov yam ntxwv combustion: flammable, los ntawm qhov hluav taws kub mus txuas ntxiv, qhov kawg ntawm cov nplaim taws yog daj thiab qis kawg yog xiav, melting dripping thaum hlawv, muab cov ntxhiab tsw ntawm paraffin hlawv;Polyethylene ua melting point range yog 132 ~ 1350C, ignition kub yog 3400C, spontaneous combustion kub yog 3900C.

Polyethylene (PE) feem ntau muab faib ua LDPE, MDPE, HDPE, FMPE ob peb pawg.

1, LDPE: tsawg ntom polyethylene yog ib lub lightest series ntawm polyethylene, tseem hu ua low-pressure polyethylene, cov qauv cov yam ntxwv yog nonlinear, tsis tshua muaj crystallinity thiab softening taw tes, muaj zoo elasticity, elongation, hluav taws xob rwb thaiv tsev, transparency, thiab siab cuam tshuam lub zog.Tsawg ntom polyethylene muaj cov khoom siv tsis zoo, tsis muaj cua sov ua haujlwm thiab, ntxiv rau, qhov pom tseeb tsis muaj zog yog qhov tsis zoo rau ib puag ncig kev ntxhov siab tawg.

2, MDPE: nruab nrab ntom polyethylene, tseem hu ua nruab nrab siab polyethylene thiab Philip polyethylene, nws cov kev ua tau zoo thiab high density polyethylene theem nuo, lub Hoobkas tsis siv lawm, tsis tau piav qhia ntawm no.

3, HDPE, siab ntom polyethylene nrog tsawg ntom polyethylene, tseem hu ua high-pressure polyethylene, nws muaj kev ua tau zoo heev, xws li kev txhim kho tshav kub tsis kam thiab txhua yam muaj zog, xws li ntev tensile, dabtsi yog khoov zog, compression zog thiab shear zog), thiab txhim kho cov dej vapor thiab roj barrier zog, ib puag ncig kev nyuaj siab cracking kuj yog superior.

4, FMPE: foamed PE yog cov khoom siv ua npuas ncauj ntau tshaj plaws, siv cov tshuaj foamed polyethylene, nws cov dielectric tsis tu ncua tuaj yeem txo mus txog 1.55.Yog hais tias cov cuab yeej tshiab ntawm kev siv lub cev foaming, uas yog, thaum extrusion rau inert gas (nitrogen los yog cua) rau hauv lub molten polyethylene ua npuas ncauj, qhov me me ntawm cov npuas yuav tau los ntawm polyethylene ua npuas ncauj, foaming degree yuav tswj tau ntawm 35-40. %, ntau tshaj 40% Zhui, nws cov dielectric tas li tuaj yeem txo mus rau 1.20 los yog li ntawd, thiab vim tias tsis siv tshuaj foaming tus neeg sawv cev, lub rwb thaiv tsev tsis muaj foaming tus neeg sawv cev residue, thiab dielectric poob tuaj yeem txo qis heev, uas tau mus txog. qib ntawm huab cua rwb thaiv tsev.

Polyethylene muaj cov hluav taws xob rwb thaiv tsev zoo heev thiab yog siv dav hauv kev sib txuas lus cable rwb thaiv tsev.Txhawm rau txhim kho cov kev qhia thiab kev lag luam ntawm kev sib txuas lus cables, ua npuas ncauj polyethylene feem ntau yog siv.Txhawm rau txhim kho qhov kev ntxhov siab ib puag ncig kev ua haujlwm, ntxiv rau kev siv XPE, tuaj yeem xaiv qhov ntsuas qhov ntsuas me me ntawm PE.Feem ntau, qhov me me ntawm qhov hnyav molecular (qhov siab dua qhov ntsuas melting), qhov phem dua qhov kev ntxhov siab ib puag ncig tawg.Lub melting Performance index qis dua 0.4 tuaj yeem zam qhov kev ntxhov siab ib puag ncig.Qhov ceev ntawm 0.950, melting Performance index ntawm ntau yam me me, feem ntau tiv taus ib puag ncig kev ntxhov siab tawg.Yog tias qhov ntom ntom ntau dua 0.95, qhov kev ntxhov siab ib puag ncig kev tawg kuj tseem phem dua, tab sis qhov qis dua nrog tib qhov ntsuas melting zoo dua.Txawm li cas los xij, HDPE molding feem ntau muaj kev ntxhov siab sab hauv, uas yuav tsum tau them sai sai rau hauv kev siv.

Kev sib xyaw PE thiab EVA hauv ib qho kev faib ua feem tuaj yeem txhim kho qhov kev ntxhov siab ib puag ncig;Sib xyaw nrog PP tuaj yeem txhim kho hardness;Sib xyaw nrog PE ntawm qhov sib txawv ntawm qhov sib txawv, tuaj yeem kho nws qhov softness thiab hardness.

Ethylene-vinyl acetate copolymer (EVA)

EVA yog ib hom thermoplastic nrog elastic zoo li nuo roj hmab, nws cov kev ua tau zoo thiab cov ntsiab lus ntawm vinyl acetate (VA) muaj kev sib raug zoo: qhov me me ntawm VA yog zoo li lub siab siab polyethylene, thiab qhov VA ntau dua li roj hmab.EVA nuo siab siab polyethylene nrog cov ntsiab lus VA tsawg, mos thiab zoo cuam tshuam lub zog, haum rau kev tsim cov khoom sib xyaw.

EVA muaj elasticity zoo thiab tsis tshua muaj kub yooj, tshuaj tiv thaiv, huab cua tsis kam, thiab LDPE copolymerization, tuaj yeem txhim kho qhov kev tiv thaiv ib puag ncig ntawm LDPE, cuam tshuam tsis kam, hardness thiab adhesion ntawm tus neeg xyuas pib thiab rwb thaiv tsev.

Tetrapolypropylene (PP)

Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm polypropylene yog 0.89 txog 0.91, uas yog qhov tsawg tshaj plaws ntawm cov khoom siv yas.Nws muaj lub zog zoo txhua yam, qhov siab tshaj plaws softening kub nyob rau hauv thermoplastic resin, thiab zoo kub tsis kam thiab aging kuj.Tsuas yog qhov kev sib hloov kho qhov muag tsis zoo me ntsis, tab sis tuaj yeem txhim kho los ntawm copolymerization nrog stabilizers.

Cov khoom siv dav dav ntawm polypropylene: Cov tsos ntawm PP zoo ib yam li HDPE, nws yog cov khoom siv dawb, pob tshab dua PE, tsis muaj tshuaj lom, combustible thiab yuav txuas ntxiv hlawv tom qab hluav taws, thiab tso cov ntxhiab tsw ntawm cov roj av nuo.

Piv nrog polyethylene, polypropylene muaj cov yam ntxwv sib txawv hauv qab no:

1, PP nto hardness siab dua PE, hnav tsis kam thiab khoov deformation muaj peev xwm zoo heev, yog li PP lub npe hu ua "tsis tshua muaj siab zog yas".

2, PP zoo dua li PE lwm qhov zoo dua yog yuav luag tsis muaj qhov tshwm sim ntawm ib puag ncig kev ntxhov siab tawg, PP muaj kev tiv thaiv zoo rau ib puag ncig kev ntxhov siab tawg.Txawm li cas los xij, vim qhov kev ua haujlwm siab ntawm PP molecular qauv, nws qhov kev cuam tshuam kev ua haujlwm ntawm chav tsev kub thiab kub tsis zoo yog qhov tsis zoo.

3, Cov hluav taws xob rwb thaiv tsev ua haujlwm ntawm PP: PP yog cov khoom siv tsis yog-polar, yog li muaj hluav taws xob zoo.

Nws cov hluav taws xob rwb thaiv tsev yog qhov zoo ib yam li LDPE, thiab tsis hloov ntau zaus.Vim nws qhov ntom ntom heev, dielectric tas li yog me dua li LDPE (ε = 2.0002 ~ 0.001, ntim resistivity ntawm 1014 ω.M, tawg teb lub zog kuj yog siab heev, 30MV / m;Tsis tas li ntawd, qhov nqus dej tsawg heev, yog li PP tuaj yeem siv los ua cov khoom siv hluav taws xob ntau zaus.

Tsib cov khoom siv polyester

Cov khoom no yog cov yam ntxwv ntawm cov qauv siab, siab tsim kua muag, siab hnav tsis kam, siab elasticity thiab qis lag luam, lub siab txwv ntawm qhov ntsuas kub yog 1500C, ntau dua li lwm cov roj hmab thermoplastic, tab sis kuj muaj cov roj zoo heev, hnyav ua haujlwm. yam ntxwv.