Cov raj xa hluav taws xob fiber ntau yog cov qauv tseem ceeb uas tiv thaiv cov fiber los ntawm kev ntxhov siab sab nraud thiab ua kom muaj kev sib kis ruaj khov. Kev xaiv cov khoom siv ncaj qha txiav txim siab qhov kev ntseeg tau ntawm cov khoom siv thiab lub neej ua haujlwm ntawm cov xov hluav taws xob.
Vim li cas PBT thiaj li nyiam dua
Polybutylene terephthalate (PBT)muaj ib qho elastic modulus li ntawm 2–3 GPa, siab dua li ntawm PA12 (polyamide 12), uas yog kwv yees li 1.2–1.8 GPa. Qhov no txhais tau tias deformation qis dua nyob rau hauv tib lub load thiab zoo dua tiv taus lateral compression.
Nws cov coefficient ntawm linear thermal expansion yog kwv yees li (6–10) × 10⁻⁵ /°C, muab kev ruaj khov zoo heev, uas pab tswj cov fiber ntau dhau thiab txo cov kev pheej hmoo microbending nyob rau hauv qhov kub thiab txias.
Ntxiv rau, kev nqus dej tsawg, kev tiv thaiv tshuaj lom neeg zoo, thiab tus nqi nruab nrab ua rau PBT yog ib qho ntawm cov ntaub ntawv tseem ceeb rau kev siv cov raj xoob.
Yuav tsum nco ntsoov tias PBT yog ib hom polymer semi-crystalline, thiab nws cov crystallinity nyob ntawm seb muaj pes tsawg yam kev ua extrusion. Kev tswj cov txheej txheem kom zoo yog qhov tseem ceeb rau kev ua haujlwm ruaj khov.
Peb Qhov Kev Tswj Xyuas Tseem Ceeb
Qhov kev ruaj khov ntawm kev ua haujlwm ntawm cov raj xoob nyob ntawm kev tswj hwm nruj ntawm peb qhov tseem ceeb, txhua qhov cuam tshuam ncaj qha rau kev ua haujlwm cable ntev:
Cov Ntsuas Kev Ntws Yaj (MFI):
Nws qhia txog qhov kev ntws tawm ntawm extrusion. Rau cov PBT qib xoob raj, nws feem ntau raug tswj ntawm 7.0–15.0 g / 10 feeb. Nws yuav tsum tau sib phim zoo nrog cov khoom siv ua tiav; txwv tsis pub, qhov zoo ntawm cov raj yuav raug cuam tshuam.
Kev Ntsws:
Tus cwj pwm thermal shrinkage cuam tshuam rau qhov kev faib tawm ntawm cov fiber ntau dhau hauv lub raj, uas ua rau muaj kev cuam tshuam rau kev poob ntawm microbending thiab kev ua haujlwm qis-kub. Nws yog ib qho tseem ceeb rau kev xa hluav taws xob ruaj khov.
Kev Tiv Thaiv Kev Laus ntawm Dej Kub:
Cov ester bonds hauv PBT molecular chains yuav raug hydrolysis nyob rau hauv qhov kub thiab txias siab thiab av noo siab, ua rau kev ua haujlwm poob qis. Kev laus sai dua siv cov kev sim siab ntawm lub nkoj, ntsuas qhov viscosity intrinsic thiab kev khaws cia cov khoom siv kho tshuab, feem ntau yog siv los ntsuas kev ntseeg tau mus sij hawm ntev. Qhov no kuj yog ib qho ntawm cov laj thawj vim li cas PBT thiaj siv dav hauv cov cables optical hauv av thiab ib puag ncig hnyav.
Cov Khoom Siv Lwm Yam thiab Kev Hloov Kho rau Cov Ntawv Thov Tshwj Xeeb
Tsis yog txhua daim ntawv thov siv tau rau PBT ntshiab. Nyob ntawm seb qhov yuav tsum tau ua ntawm ib puag ncig, lwm cov ntaub ntawv thiab cov thev naus laus zis hloov kho tau siv los ua kev ntxiv:
PP (Polypropylene):
PP muaj kev tiv thaiv hydrolysis zoo dua thiab muaj kev ywj pheej zoo. Txawm li cas los xij, vim nws qhov polarity qis, kev sib raug zoo nrog cov tshuaj filling nyob ntawm cov txheej txheem formulation tshwj xeeb thiab yuav tsum tau soj ntsuam kom zoo.
PA12 (Polyamide 12):
PA12 tau siv rau hauv cov qauv tsim cov raj xoob thaum ntxov, tab sis vim nws cov modulus qis dua thiab tus nqi siab dua, nws tau hloov pauv ntau hauv cov ntawv thov tseem ceeb. Tam sim no nws feem ntau yog siv rau hauv cov ntawv thov niche uas xav tau kev ywj pheej siab.
Cov Kev Hloov Kho:
Qhov kev txhim kho feem ntau ntawm kev ua haujlwm tiv thaiv kev khoov yog los ntawm kev sib xyaw PBT nrog TPEE (Thermoplastic Polyester Elastomer). Cov qauv nyuaj-segment / mos-segment txhim kho kev tiv thaiv kev khoov rov qab, ua tau raws li qhov yuav tsum tau ua rau kev sib koom ua ke ntawm cable thiab kev hloov pauv dynamic.
Ntxiv rau, PET/PBT blending systems kuj tseem tab tom tshawb nrhiav kom sib npaug ntawm kev ua tau zoo thiab tus nqi.
Cov Kev Cai Tseem Ceeb ntawm Kev Sau Cov Tshuaj (Cable Jelly)
Cov tshuaj filling hauv lub raj yog ib qho tseem ceeb tiv thaiv rau cov fibers optical, thiab nws cov kev ua tau zoo feem ntau yog soj ntsuam los ntawm cov hauv qab no:
Thixotropy:
Nws ua haujlwm zoo li cov kua dej uas tsis muaj viscosity nyob rau hauv kev ntxhov siab shear rau kev yooj yim sau, thiab tom qab ntawd sai sai rov qab mus rau lub xeev gel thaum tsis hloov pauv, muab kev tiv thaiv ntev thiab kev tiv thaiv tshuab rau cov fibers.
Kev Hloov Pauv Hydrogen (Theem Tsim Hydrogen):
Cov hydrogen nkag mus rau hauv cov fibers optical ua rau kev poob ntawm kev sib kis. Yog li ntawd, cov khoom sib xyaw ua ke yuav tsum muaj cov hydrogen tsawg heev. Cov khoom lag luam zoo yuav suav nrog cov tshuaj hydrogen scavengers kom txo qis kev pheej hmoo ntxiv.
Kev Huv Si thiab Kev Sib Haum Xeeb:
Cov tshuaj yuav tsum sib xws, tsis muaj cov khoom tsis huv thiab cov pa npuas, thiab sib xws nrog cov tshuaj fiber thiab cov ntaub ntawv raj kom tsis txhob muaj kev puas tsuaj lossis kev cuam tshuam.
Txij li kev tswj hwm crystallization ntawm PBT, mus rau kev ua kom zoo dua ntawm cov thev naus laus zis hloov kho, thiab thaum kawg mus rau kev ua kom tiav cov khoom sib xyaw, txhua kauj ruam yuav tsum tau tswj hwm kom meej kom ntseeg tau tias kev sib kis optical ruaj khov mus sij hawm ntev thiab muab lub hauv paus txhim khu kev qha rau kev sib txuas lus.
Lub sijhawm tshaj tawm: Tsib Hlis-28-2026