1. Txheej txheem cej luam
Nrog rau txoj kev loj hlob sai ntawm cov ntaub ntawv thiab kev sib txuas lus thev naus laus zis, optical cables, raws li cov neeg nqa khoom tseem ceeb ntawm kev xa xov xwm niaj hnub, muaj kev xav tau ntau dua rau kev ua haujlwm thiab kev ua tau zoo.Polybutylene terephthalate (PBT), raws li cov thermoplastic engineering yas nrog kev ua haujlwm zoo, ua lub luag haujlwm tseem ceeb hauv kev tsim cov khoom siv kho qhov muag. PBT yog tsim los ntawm condensation polymerization ntawm dimethyl terephthalate (DMT) los yog terephthalic acid (TPA) thiab butanediol tom qab esterification. Nws yog ib qho ntawm tsib lub hom phiaj engineering plastics thiab tau pib tsim los ntawm GE thiab industrialized hauv 1970s. Txawm hais tias nws pib lig, nws tau tsim kho sai heev. Vim nws txoj kev ua tau zoo heev, kev ua tau zoo thiab kev ua haujlwm siab, nws yog dav siv hauv cov khoom siv hluav taws xob, tsheb, kev sib txuas lus, khoom siv hauv tsev thiab lwm yam haujlwm. Tshwj xeeb tshaj yog nyob rau hauv kev tsim ntawm optical cables, nws yog tsuas yog siv nyob rau hauv zus tau tej cov optical fiber xoob hlab thiab yog ib tug indispensable hom ntawm high-kev ua tau zoo cable cov ntaub ntawv nyob rau hauv raw cov ntaub ntawv ntawm optical cables.
PBT yog ib qho dawb dawb semi-pob tshab rau opaque semi-crystalline polyester nrog zoo heev kub tsis kam thiab kev ruaj ntseg. Nws cov qauv molecular yog [(CH₂)₄OOCC₆H₄COO]n. Piv nrog PET, nws muaj ob pawg methylene ntau dua hauv cov saw hlau, muab nws cov saw hlau tseem ceeb ntawm cov qauv helical thiab yooj yim dua. PBT tsis tiv taus cov kua qaub thiab muaj zog alkalis, tab sis tuaj yeem tiv taus cov kuab tshuaj organic feem ntau thiab yuav decompose ntawm qhov kub thiab txias. Ua tsaug rau nws lub cev zoo heev, kev ruaj ntseg tshuaj thiab kev ua haujlwm, PBT tau dhau los ua cov khoom siv zoo tshaj plaws hauv kev lag luam kho qhov muag thiab tau siv dav hauv ntau yam khoom siv PBT rau kev sib txuas lus cables thiab optical cables.
2. Cov yam ntxwv ntawm cov khoom siv PBT
PBT feem ntau yog siv nyob rau hauv daim ntawv ntawm kev hloov kho blends. Los ntawm kev ntxiv cov nplaim hluav taws xob, cov tshuaj tiv thaiv thiab lwm yam kev hloov kho, nws cov hluav taws kub tsis kam, hluav taws xob rwb thaiv tsev thiab kev ua kom haum tuaj yeem txhim kho ntxiv. PBT muaj lub zog txhua yam, zoo toughness thiab hnav tsis kam, thiab tuaj yeem tiv thaiv cov fibers hauv qhov kho qhov muag los ntawm kev puas tsuaj rau cov khoom siv. Raws li ib qho ntawm cov khoom siv raw khoom siv rau cov khoom siv kho qhov muag, PBT resin ua kom cov khoom siv kho qhov muag muaj qhov hloov tau zoo thiab ruaj khov thaum tuav cov txheej txheem muaj zog.
Lub caij no, nws muaj zog tshuaj lom neeg ruaj khov thiab tuaj yeem tiv taus ntau yam corrosive media, ua kom lub sijhawm ruaj khov ntawm cov khoom siv kho qhov muag hauv cov cheeb tsam nyuaj xws li cov av noo thiab ntsev tsuag. Cov khoom siv PBT muaj kev ruaj ntseg zoo heev thiab tuaj yeem tswj tau qhov kev ua haujlwm ruaj khov txawm tias nyob hauv qhov chaw kub kub, ua rau nws tsim nyog rau kev siv cov khoom siv kho qhov muag hauv cov cheeb tsam kub sib txawv. Nws muaj kev ua haujlwm zoo heev thiab tuaj yeem tsim los ntawm extrusion, txhaj tshuaj molding thiab lwm txoj kev. Nws yog tsim rau kho qhov muag cable sib dhos ntawm cov duab sib txawv thiab cov qauv thiab yog ib qho kev ua haujlwm siab engineering yas dav siv hauv kev tsim cable.
3. Kev siv PBT hauv Optical Cables
Nyob rau hauv cov txheej txheem ntawm optical cable manufacturing, PBT yog tsuas yog siv nyob rau hauv zus tau tej cov hlab ntsha rauoptical fibers. Nws lub zog siab thiab tawv tuaj yeem txhawb nqa thiab tiv thaiv fiber ntau optical, tiv thaiv kev puas tsuaj los ntawm lub cev xws li khoov thiab ncab. Tsis tas li ntawd, cov khoom siv PBT muaj qhov ua tau zoo ntawm cov cua sov thiab kev tiv thaiv kev laus, uas yuav pab txhim kho kev ruaj ntseg thiab kev ntseeg siab ntawm cov khoom siv kho qhov muag thaum lub sijhawm ua haujlwm ntev. Nws yog ib qho ntawm cov khoom siv tseem ceeb PBT siv nyob rau hauv optical cables tam sim no.
PBT kuj tseem siv tau los ua cov txheej txheem ntawm cov kab hluav taws xob kho qhov muag. Lub sheath tsis tsuas yog yuav tsum muaj qee yam kev siv lub zog los tiv thaiv kev hloov pauv hauv ib puag ncig sab nraud, tab sis kuj yuav tsum muaj kev hnav zoo heev, tshuaj tiv thaiv corrosion thiab UV aging kuj los xyuas kom meej lub neej kev pab cuam ntawm lub optical cable thaum lub sij hawm tso tawm sab nraum zoov, nyob rau hauv damp los yog Marine ib puag ncig. Optical cable sheath muaj cov kev xav tau siab rau kev ua haujlwm thiab kev hloov pauv ib puag ncig ntawm PBT, thiab PBT resin qhia tau hais tias kev siv tau zoo.
Hauv kev kho qhov muag cable sib koom ua ke, PBT kuj tuaj yeem siv los tsim cov khoom tseem ceeb xws li cov thawv sib koom. Cov khoom no yuav tsum tau ua kom tau raws li cov kev cai nruj rau kev sib khi, kev tiv thaiv dej thiab huab cua tsis kam. Cov khoom siv PBT, nrog nws cov khoom zoo heev ntawm lub cev thiab cov qauv kev ruaj ntseg, yog ib qho kev xaiv zoo heev thiab ua lub luag haujlwm tseem ceeb hauv kev txhawb nqa ntawm cov khoom siv kho qhov muag cable.
4. Kev ceev faj txog kev ua haujlwm
Ua ntej txhaj tshuaj molding ua, PBT yuav tsum tau qhuav ntawm 110 ℃ to 120 ℃ li 3 teev kom tshem tawm cov adsorbed noo noo thiab tsis txhob tsim cov npuas los yog brittleness thaum lub sij hawm ua. Lub molding kub yuav tsum tau tswj ntawm 250 ℃ thiab 270 ℃, thiab pwm kub yog pom zoo kom khaws cia ntawm 50 ℃ to 75 ℃. Vim tias cov iav hloov pauv kub ntawm PBT tsuas yog 22 ℃ thiab qhov txias crystallization tus nqi nrawm, nws lub sijhawm txias yog luv luv. Thaum lub sij hawm txhaj tshuaj molding txheej txheem, nws yog ib qhov tsim nyog los tiv thaiv lub nozzle kub los ntawm qis heev, uas yuav ua rau cov ndlwg channel yuav tsum tau thaiv. Yog hais tias lub chim kub siab tshaj 275 ℃ los yog cov khoom molten nyob twj ywm ntev heev, nws yuav ua rau thermal degradation thiab embrittlement.
Nws raug nquahu kom siv lub rooj vag loj dua rau kev txhaj tshuaj. Qhov kub khiav system yuav tsum tsis txhob siv. Cov pwm yuav tsum tswj kom muaj cov pa tawm zoo. PBT sprue cov ntaub ntawv uas muaj cov nplaim hluav taws kub hnyiab los yog iav fiber ntau yog tsis pom zoo kom rov siv dua kom tsis txhob muaj kev ua haujlwm tsis zoo. Thaum lub tshuab kaw lawm, lub thoob yuav tsum tau muab ntxuav kom huv si hauv lub sijhawm nrog PE lossis PP cov ntaub ntawv los tiv thaiv cov pa roj carbonization ntawm cov khoom seem. Cov kev ua haujlwm no muaj cov lus qhia tseem ceeb rau cov khoom siv kho qhov muag cable raw khoom hauv cov khoom siv cable loj loj.
5. Daim ntawv thov zoo
Daim ntawv thov ntawm PBT hauv optical cables tau txhim kho qhov kev ua tau zoo ntawm cov khoom siv kho qhov muag. Nws lub zog siab thiab toughness txhim khu kev cuam tshuam thiab qaug zog tiv thaiv ntawm optical cable, thiab txuas ntxiv nws lub neej kev pab cuam. Lub caij no, kev ua tau zoo ntawm cov ntaub ntawv PBT tau txhim kho kev tsim khoom thiab txo cov nqi tsim khoom. Qhov zoo tshaj plaws los tiv thaiv kev laus thiab tshuaj tiv thaiv corrosion ntawm optical cable pab kom nws muaj kev ruaj khov rau lub sijhawm ntev nyob rau hauv ib puag ncig hnyav, ua kom muaj kev ntseeg siab thiab tu lub voj voog ntawm cov khoom.
Raws li qeb tseem ceeb hauv cov khoom siv raw ntawm cov khoom siv kho qhov muag, PBT resin plays lub luag haujlwm hauv ntau yam kev sib txuas thiab yog ib qho ntawm cov thermoplastic engineering yas uas cov tuam txhab kho qhov muag muab qhov tseem ceeb rau thaum xaiv cov khoom siv cable.
6. Cov lus xaus thiab kev cia siab
PBT tau dhau los ua cov khoom tseem ceeb hauv kev tsim kho qhov muag cable vim nws qhov kev ua tau zoo hauv cov khoom siv hluav taws xob, thermal stability, corrosion resistance thiab processability. Nyob rau hauv lub neej yav tom ntej, raws li kev lag luam kev sib txuas lus kho qhov muag txuas ntxiv mus, cov kev xav tau siab dua yuav raug muab tso rau pem hauv ntej rau cov khoom siv. Kev lag luam PBT yuav tsum tsis tu ncua txhawb kev tsim kho thev naus laus zis thiab kev txhim kho ntsuab ib puag ncig tiv thaiv, ntxiv dag zog rau nws cov kev ua tau zoo thiab kev ua haujlwm ntau lawm. Thaum ua tau raws li qhov yuav tsum tau ua, txo qis kev siv hluav taws xob thiab cov nqi khoom siv yuav pab PBT ua lub luag haujlwm tseem ceeb hauv cov kab hluav taws xob kho qhov muag thiab ntau yam ntawm daim ntawv thov.
Post lub sij hawm: Jun-30-2025