Kev npaj technology ntawm PTFE fiber ntau

Carrier spinning method

1.Kev ntub dej2.Qhuav spinning

3.Melt spinning txoj kev

Kev ntub dejKev ntub dej ntawm PTFE feem ntau yog nyob rau hauv viscose los yog polyvinyl cawv (PVA) raws li cov cab kuj, sib tov nrog PTFE hmoov los yog emulsion dispersion, thiab ntxiv ib tug me me ntawm boric acid, ua spinning tov, ua ntub spinning, spinning taub hau muab tso rau hauv sodium sulfate thiab ammonium. sulfate coagulation da dej, dope los ntawm lub nozzle nyob rau hauv lub coagulation da dej solidified rau hauv fiber, fiber tom qab leaching cov menyuam mos dej leaching, dua tom qab roj cov menyuam thiab ziab cov menyuam feem, nyob rau hauv 380 ~ 400 ℃ kub sintering, tshem tawm PVA carbide carbide, stretch ua PTFE fiber ntau hauv qab 350 ℃.Txoj kev no ntawm spinning siv cov txheej txheem cumbersome, siab ua nqi thiab lub zog noj thiab siv sij hawm-siv.Guo Yu-hai thiab lwm tus tau tsim ib txoj hauv kev ua tau zoo ntawm kev npaj ntawm PTFE fiber ntau.Cov txheej txheem no yuav ua ntej sib xyaw ua ke ntawm cov txheeb ze molecular loj ntawm volatile organic solvent nrog dej, nyob rau hauv cov xwm txheej ntawm do nrog PVA, txuas ntxiv do kom txog thaum tag nrho yaj, sib tov ntawm PVA dej tov.Tom qab ntawd PVA dej tov thiab persulfate, PTFE dispersion mixing uniformity, dope.Tom qab ntawd borate los yog boric acid yaj nyob rau hauv dej, nrog alkaline pH hloov raws li alkaline, sib tov coagulation da dej.Thaum kawg txais yuav cov khoom siv ntub dej ntawm cov pa, cov kua dej spinning conveying mus rau lub nozzle, los ntawm metering twj tso kua mis metering, direct spinning nyob rau hauv lub coagulation da dej, ces ziab, sintering thiab stretch, PTFE fiber yog tsim.

Qhuav spinning

Txoj kev no yog PTFE gel pom tau los ntawm qhuav spinning.PTFE yog thawj concentrated dispersion thiab PVA blended, ntxiv gel regulator boric acid los yog Borate ntsev thiab alkalis kho cov pH rau alkaline, whisking mus rau ib tug cia li nce nyob rau hauv lub viscosity thiab gel tsim, yog spinning tov.Thiab tom qab ntawd qhuav lawv siv cov khoom siv sib xyaw ua ke, roj siab los yog cov kua nplaum spinning kua rau lub taub hau spinning, ntsuas hauv metering twj, qhuav spinning, thiab ces qhuav, npaj sib tov ntawm PTFE thiab PVA fiber.Thaum kawg siv cov khoom siv sintering thiab ncab, yuav tsum sib xyaw sintering kom tshem tawm PVA fiber ntau, thaum kawg tom qab stretching txheej txheem stretching, PTFE fiber ntau npaj.

Carrier spinning txoj kev yog txoj kev paub tab tshaj plaws ntawm kev npaj PTFE fiber ntau, thiab tau yog ib qho ntawm ob peb lub tuam txhab kom paub txog kev lag luam.Ntawm lawv, Nyiv toray lub tuam txhab USES huab hwm coj feem 60%, qhov nruab nrab particle loj yog 0. 3 microns ntawm PTFE, thiab qhov loj feem ntawm 2% sodium alginic acid aqueous tov ntawm emulsoid mix spinning, fiber ntau los ntawm coagulation, da dej dua tom qab. ntxuav, ziab, thiab nyob rau hauv 380 ℃ kub stretching, tshem tawm alginic acid sodium, nce PTFE fiber, nws monofilament linear ceev ntawm 0. 67 dtex thiab tawg lub zog ntawm l.25 cN / dtex, elongation ntawm tawg mus txog 59%, txoj kev spinning dope spinnability zoo dua nrog viscose raws li cov cab kuj ntawm PTFE dope spinnability.Showa industries, siv 114 pawg pawg ntawm 60% PT - 100 FE dispersed emulsion thiab cellulose ntawm pawg pawg ntawm 8.9% viscose spinning tov spinning, tom qab solidification ntawm nascent fibers los ntawm dej, nyem kua, nrog 0. 05 mol / L Na0H ua, thiab kev kho cua sov fiber ntau hauv qab 280 ℃ thiab kub ncab hauv qab 320 ℃, qhov kawg kev kho cua sov 72 h hauv qab 320 ℃, fiber ntau lub zog tawg rau 1. 16 cN / dtex elongation ntawm tawg yog 16.1%.Tsis tas li ntawd, Beijing ua qauv qhia cog yuav yog 60% loj feem ntawm PTFE emulsion thiab 10% loj feem ntawm PVA tov nyob rau hauv kev faib ua feem ntawm 1: 1.5 cov tshuaj spinning spinning, tom qab solidification ntawm fiber ntau los ntawm acetal, ntxuav, ziab, sintering thiab ncab rau. PTFE fiber ntau qhov system.

Txiav zaj duab xis splitting methodCutting zaj duab xis tawg txoj kev nyob rau hauv thaum ntxov 1970s los ntawm lub Austrian Lenzing tuam txhab kev loj hlob thiab industrialization, nyob rau hauv kev npaj ntawm PTFE fiber, yuav tsum tau ua PTFE hmoov sinter cylindrical PTFE parison, txiav nws nrog ib tug tej thickness ntawm cov zaj duab xis, thiab Tom qab ntawd los ntawm cov cuab yeej serrated muab faib ua cov lo lo ntxhuav, saum toj no lub melting point (327 ℃) sintering, ces los ntawm stretching thiab xaus nrog PTFE fiber ntau kho cua sov.Txoj kev no tuaj yeem tau txais cov fiber ntau nrog cov qauv microporous, thiab lub zog siab.Multifilament tuaj yeem siv los ua cov khoom siv sealing, luv fibers, tuaj yeem siv rau hauv rab koob.

Tsis tas li ntawd, PTFE zaj duab xis lossis daim ntawv tseem tuaj yeem txiav rau hauv qhov dav me me, thiab tom qab ntawd ncaj qha tensile nqaim ntaub ua los ntawm lub zog siab PTFE fibers.Tab sis nws yog ib qho nyuaj rau kev tswj cov khaub ncaws uas tau los ntawm kev txiav raws lub longitudinal kev taw qhia los ntawm qhov dav dav ntawm cov ntaub, thiab nqaim ntaub nyhav mus rau ib feem ntawm fibril, ntau stretch nyob rau hauv nqaim ntaub PTFE fibers yooj yim tawg los yog los ntawm ib nrab txiav nyob rau hauv lub longitudinal kev taw qhia. ntawm zaj duab xis yog filament PTFE membrane orientation.Raws li cov membranes ntawm longitudinal kev taw qhia thiab nyob rau hauv lub transverse kev taw qhia ntawm cov zaj duab xis nrog az duab los yog linear-convex zoo embossed thiab txiav, lub resulting filament nrog rau ib tug neeg fibrils ib feem puas lawm txoj cai lub network qauv.PTFE fibers ua li no tus neeg fibrils nrog me me nruab nrab loj thiab uniform loj.

Nyiv Asahi ntawm rau hauv Corporation los ntawm kev txiav zaj duab xis tawg raug cai rau hauv muaj zog stretch, thiab kuj tshuaj lom neeg kev ua tau zoo heev ntawm PTFE yarn.yuav muaj qhov tus nqi 48% ntawm PTFE zaj duab xis tsim kua muag rau hauv 222 dtex fiber ntau, dua nyob rau hauv nws ntxiv twist rau 750 twist / m, nyob rau hauv 440 ℃ thiab 1 000 m / min Xia stretch, tau ntawm fiber ntau density rau 55 dtex, thiab muaj Qhov tus nqi 1%, modulus mus txog 294 cN / dtex.

Paste extrusion spinning methodPaste extrusion spinning feem ntau PTFE hmoov 16% ~ 25% nrog loj feem ntawm volatile lubricants sib tov, qhib rau hauv ib qho muab tshuaj txhuam, ua los ntawm cov embryos prefabricated, thiab nyob rau hauv tej yam kev nyuaj siab los ntawm ib tug spinneret nrog ib tug strip ntawm tuag extrusion spinning, thiab ces los ntawm ziab, sintering, siab stretch nyob rau hauv high kub, non-uniform dawb xov paj.Tsis tas li ntawd, tseem tuaj yeem nyem cov khoom siv extrusion los yog nyias strips, tom qab ntawd los ntawm cov txheej txheem dov kom tshem tawm cov khoom ntxiv, thiab txiav ntev ntev, kos duab thiab fluffy tom qab ua tiav, yog PTFE fibers tau tsim los ntawm paste extrusion ntawm nyias phab ntsa, me me txoj kab uas hla thiab permeability ntawm PTFE. hollow fiber.PTFE hmoov nyob rau hauv tej yam kev mob hauv qab nws melting point ua los ntawm PTFE hollow fiber, thiab ces raug rho tawm haujlwm 10 min ntawm 350 ℃, 250 ℃ hauv qab 400%, yog 0.76 hli puab txoj kab uas hla thiab phab ntsa thickness ntawm 0.10 hli, txoj kab uas hla ntawm tsawg tshaj li 0.15 hli hollow fibers.

Nyob rau hauv 1997, M. Shimizu npaj ib txoj kev npaj siab zog thiab PTFE fibers los ntawm paste extrusion.Ntxiv rau PTFE hmoov pawg 20% ​​ntawm lubricants, embryo, extrusion, tau txais ib lub xaim, kev kho cua sov thiab tom qab ntawd 350 ℃ 1.5h, thiab 387 ℃ mus rau 50 mm / min ntawm ceev ncab 10 zaug, tau txais lub zog ntau npaum li 1.56 ~ 2.82 GPa PTFE fibers.

PTFE hmoov tau tov nrog ib tug lubricant (isoparaffin roj Isopar-E) los tsim ib tug muab tshuaj txhuam, sawv ntawm 0 ℃ 180 h ntawm 40 ℃ kho 30 h, ua kom cov mix tag nrho wetting thiab o, ces nias embryo thiab extrusion, tuav 2 h nyob rau hauv 340 ℃, thiab ces mus rau 0. 5 c / min ceev mus rau chav tsev kub, thaum kawg stretching kom tau nyob rau hauv ib tug 370 c PTFE fiber, 3.5 ~ 4.0 cN / dtex lub pob txha lub zog, elongation ntawm so yog 22%.

Melt spinning txoj kev

Melt spinning yog PTFE cov ntsiab lus rau 4% ~ 5% ntawm perfluorinated ethylene copolymer ntawm perfluoro-n-propyl ether sib xyaw spinning yaj, tom qab spinning los ntawm cov ntsia hlau extrusion tshuab twj tso kua mis ntau lub siab txhaj qhov, ua rau nws mus rau hauv ib tug zoo kwj rau hauv cov huab cua, thiab txias. nyob rau hauv lub spinning channel rau hauv cov hlau.PTFE fibers siab zog ntawm txoj kev no, tab sis PTFE supermolecular qauv hloov tom qab melting, ua rau nws ductility ploj lawm thiab molecular saw orientation stretch yog thaiv, ua ke nrog PTFE siab viscosity thiab pom tseeb yooj, PTFE yaj fiber ntau npaj los ntawm cov ntsia hlau extruder rau kev sib piv ncaj qha nyuaj, nyuaj mus cuag industrialization.Plunger extrusion txoj kev tuaj yeem kov yeej qhov nyuaj no.Lub plunger nyob rau hauv cov txheej txheem extrusion, vim tsis tshua muaj zog nto ntawm PTFE thiab phab ntsa-slip tshwm sim, txo qhov tsis tsim nyog shear nyob rau hauv cov txheej txheem ntws, yog li lawv tuaj yeem ua rau PTFE yaj spinning.Li Min thiab lwm tus neeg hauv Donghua tsev kawm ntawv, tau npaj los ntawm PTFE fiber ntau nrog qhov hnyav molecular.Tervoort los ntawm cov txheeb ze molecular loj xws li PTFE thiab PTFE tov nrog tsawg tus txheeb ze molecular loj, yaj ua, npaj PTFE filament.Cov khoom ntawm PTFE fibers ua qhov no phem dua li cov ntshiab PTFE fiber ntau nrog qhov hnyav molecular.