Polyvinyl chloride (PVC)yas yog cov khoom sib xyaw tsim los ntawm kev sib xyaw PVC cob nrog ntau yam khoom ntxiv. Nws nthuav tawm cov khoom siv zoo heev, tshuaj tiv thaiv corrosion, nws tus kheej tua cov yam ntxwv, huab cua tsis zoo, cov khoom siv hluav taws xob zoo dua, kev ua haujlwm yooj yim, thiab tus nqi qis, ua rau nws yog cov khoom siv zoo tshaj plaws rau cov hlau thiab cable rwb thaiv tsev thiab sheathing.
PVC cob yog linear thermoplastic polymer tsim los ntawm polymerization ntawm vinyl chloride monomers. Nws cov qauv molecular nta:
(1) Raws li cov thermoplastic polymer, nws pom zoo plasticity thiab yooj.
(2) Lub xub ntiag ntawm C-Cl polar bonds muab cov resin muaj zog polarity, uas ua rau cov dielectric siab tas li (ε) thiab dissipation factor (tanδ), thaum muab siab dielectric zog ntawm tsawg zaus. Cov ntawv cog lus polar no tseem ua rau muaj zog intermolecular rog thiab muaj zog txhua yam.
(3) Cov tshuaj chlorine atoms hauv cov qauv molecular impart nplaim-retardant zog nrog rau cov tshuaj zoo thiab huab cua tsis kam. Txawm li cas los xij, cov chlorine atoms cuam tshuam cov qauv crystalline, ua rau muaj kev kub ntxhov thiab tsis txias tsis kam, uas tuaj yeem txhim kho los ntawm cov khoom siv ntxiv.
2. Hom PVC Resin
Cov txheej txheem polymerization rau PVC muaj xws li: ncua kev kawm ntawv polymerization, emulsion polymerization, bulk polymerization, thiab kua polymerization.
Txoj kev suspension polymerization yog tam sim no tseem ceeb hauv PVC resin ntau lawm, thiab qhov no yog hom siv hauv cov ntawv siv hlau thiab cable.
Suspension-polymerized PVC resins tau muab faib ua ob hom qauv:
Loose-type resin (XS-type): Cov yam ntxwv los ntawm cov qauv ntxeem tau, siab plasticizer absorption, yooj yim plastification, yooj yim kev tswj, thiab ob peb gel hais, ua rau nws nyiam xaiv rau cov ntaub ntawv siv hlau thiab cable.
Compact-type resin (XJ-type): Feem ntau yog siv rau lwm yam khoom yas.
3.Key Properties ntawm PVC
(1) Cov Khoom Siv Hluav Taws Xob Hluav Taws Xob: Raws li cov khoom siv polar dielectric heev, PVC resin qhia tau hais tias zoo tab sis me ntsis qis hluav taws xob rwb thaiv tsev cov khoom piv rau cov khoom tsis yog polar xws li polyethylene (PE) thiab polypropylene (PP). Lub ntim resistivity tshaj 10¹⁵ Ω·cm; ntawm 25 ° C thiab 50Hz zaus, qhov dielectric qhov tsis tu ncua (ε) yog li ntawm 3.4 txog 3.6, qhov sib txawv ntawm qhov kub thiab qhov zaus hloov pauv; Lub dissipation factor (tanδ) yog li ntawm 0.006 txog 0.2. Lub zog tawg tseem nyob siab ntawm chav tsev kub thiab lub zog zaus, tsis cuam tshuam los ntawm polarity. Txawm li cas los xij, vim nws qhov siab dielectric poob, PVC tsis haum rau high-voltage thiab high-frequency daim ntaub ntawv, feem ntau yog siv los ua rwb thaiv tsev cov ntaub ntawv rau low- thiab medium-voltage cables hauv qab no 15kV.
(2) Kev laus ruaj khov: Thaum cov qauv molecular qhia kev ruaj ntseg zoo vim muaj cov tshuaj chlorine-carbon bonds, PVC nyiam tso cov tshuaj hydrogen chloride thaum ua haujlwm hauv thermal thiab mechanical stress. Oxidation ua rau degradation los yog cross-linking, ua rau discoloration, embrittlement, loj poob ntawm txhua yam khoom, thiab deterioration ntawm hluav taws xob rwb thaiv tsev kev ua tau zoo. Yog li ntawd, tsim nyog stabilizers yuav tsum tau ntxiv los txhim kho kev laus tiv thaiv.
(3) Thermomechanical Properties: Raws li amorphous polymer, PVC muaj nyob rau hauv peb lub cev ntawm qhov kub thiab txias: lub xeev iav, lub xeev siab elastic, thiab lub xeev khov. Nrog lub iav hloov pauv kub (Tg) nyob ib puag ncig 80 ° C thiab ntws kub txog 160 ° C, PVC hauv nws lub xeev iav ntawm chav tsev kub tsis tuaj yeem ua tau raws li cov ntawv thov xaim thiab cable. Kev hloov kho yog tsim nyog kom ua tiav qhov elasticity siab dua ntawm chav tsev kub thaum tswj kom muaj cua sov txaus thiab txias tsis kam. Qhov sib ntxiv ntawm plasticizers tuaj yeem kho cov iav hloov qhov kub thiab txias.
TxogIB LUB ntiaj teb (OW Cable)
Raws li ib tug ua lag luam ntawm hlau thiab cable raw cov ntaub ntawv, ib lub ntiaj teb no (OW Cable) muab high-zoo PVC tebchaw rau rwb thaiv tsev thiab sheathing daim ntaub ntawv, lug siv nyob rau hauv lub hwj chim cables, tsev xov hlau, kev sib txuas lus cables, thiab automotive thaiv. Peb cov ntaub ntawv PVC muaj cov rwb thaiv tsev zoo heev, nplaim hluav taws kub, thiab huab cua tsis kam, ua raws li cov qauv thoob ntiaj teb xws li UL, RoHS, thiab ISO 9001. Peb tau cog lus tias yuav xa cov kev daws teeb meem PVC txhim khu kev qha thiab raug nqi raws li peb cov neeg siv khoom xav tau.
Post lub sij hawm: Mar-27-2025