Thaum twg PTFE nplaum daim kab xev
Cov dej vapor molecules yog me me. Lawv muaj peev xwm diffuse los ntawm microscopic txoj kev uas tej dej tsis tuaj yeem. Qhov tseeb dej vapor kis tus nqi (WVTR) ntawm PTFE daim kab xev nyob ntawm qhov tsawg dua ntawm PTFE's chemistry thiab ntau dua ntawm txheej txheej - tsis xws li micropores, microcracks, thiab tsis tiav fiber ntau encapsulation.
Aokai PTFE tau txheeb xyuas WVTR hla txheej txheej txheej thiab thicknesses. Kab lus no piav qhia txog yuav ua li cas PTFE cov qauv tshuaj, txheej txheej tsis xws luag, cov tswv yim tuab, thiab kev hloov kho muab tub lim ua ke los txiav txim siab vapor barrier kev ua tau zoo.
PTFE Chemical Structure - Ob Qhov Zoo thiab Kev Txwv
1. Qhov zoo - Hydrophobicity thiab crystallinity
Feature
Cov txiaj ntsig rau Dej Vapor Barrier
CF daim ntawv cog lus, qis zog saum npoo
Cov dej molecules tsis yog adsorb lossis yaj ntawm PTFE nto - thawj qhov thaiv tiv thaiv kev nkag mus ntawm noo noo
High crystallinity (> 90%)
Cov cheeb tsam crystalline yog ze li impermeable rau dej vapor - tsis muaj molecular diffusion txoj kev los ntawm cov muaju
2. Kev txwv - Amorphous Domains thiab Tsis muaj zog Intermolecular Forces
Tsis muaj zog intermolecular quab yuam ntawm PTFE molecular chains
Muaj ntau yam dawb-ntim voids nyob rau hauv amorphous domains tsim diffusion txoj kev
Pure khoom PTFE zaj duab xis muab tsuas yog nruab nrab-theem WVTR - deb inferior rau PVDC los yog EVOH
PTFE tsis yog ib qho khoom thaiv zoo kawg nkaus
Kev pom tseem ceeb: Intrinsic PTFE yog qhov cuam tshuam nruab nrab, tsis yog qhov tshwj xeeb. Kev ua tau zoo ntawm daim kab xev yog nyob ntawm ntau yam ntawm txheej txheej.
Cov txheej txheem tseem ceeb - Micropores, Microcracks, thiab Fiber Wicking
Qhov no yog qhov tseem ceeb tshaj plaws tswj hwm kev ua tau zoo ntawm kev ua haujlwm. Feem ntau PTFE nplaum tapes yog tsim los ntawm impregnation los yog txheej ntawm PTFE dispersion ua raws li los ntawm sintering, thaum lub sij hawm uas inherent flaws yog nkag tau yooj yim generated:
Hom kev puas tsuaj
Tsim Mechanism
Effect on WVTR
Micropores
Volatilized kuab tshuaj thiab tsis tiav resin fusion tawm hauv kev sib tshuam voids
Tsim txoj kev luv rau vapor nkag mus
Microcracks
Thermal expansion mismatch ntawm fiberglass substrate thiab PTFE ua rau nplua tawg tom qab sintering / txias
Qhib cov channel ncaj qha los ntawm txheej txheej
Capillary wicking ntawm fibers
Tsis tiav encapsulation ntawm iav fibers tso cai rau dej vapor nkag mus rau fiber-resin interface ntawm capillary nkaus
Enables vapor bypass ncig lub txheej
Tswv yim xaus: Tag nrho WVTR ntawm tiav PTFE daim kab xev yog tsuas yog tswj hwm los ntawm qhov tsis xws luag , tsis yog cov cuab yeej ntawm PTFE resin.
Aokai PTFE muab PTFE nplaum tapes nrog tswj txheej ceev. Rau cov ntawv thov uas tsis tshua muaj WVTR (<15 g / m² · hnub), peb pom zoo kom peb cov txheej txheem ntau txheej txheej, uas siv peb lub impregnation hla mus txuas ntxiv npog pinholes thiab txo microcrack ntom.
Txheej Thickness thiab Labyrinth nyhuv - Cov tswv yim los txo WVTR
Cov txheej tuab ntxiv txuas ntxiv rau txoj kev vapor nkag mus tab sis NW nyuam qhuav npog cov txheej txheem uas twb muaj lawm ib leeg. Cov kev daws teeb meem txhim kho tau zoo dua yog teev hauv qab no:
Tswv yim
Mechanism
Kev ua tau zoo
Multi-txheej txheej
Rov ua dua impregnation thiab sintering pab cov txheej txheej tom ntej los npog cov pinholes thiab offset defect txoj haujlwm ntawm cov tsho hauv qab
Siab - feem ntau siv tau
Kev hloov kho ntawm lamellar
Inert flaky fillers (mica hmoov, iav flakes) yog sib tov rau hauv PTFE coatings kom yuam cov dej molecules coj winding detours (labyrinth nyhuv)
Siab heev – DRastically txiav WVTR
Thicker ib lub tsho loj
Ntev diffusion txoj kev tab sis tsis xws luag nyob twj ywm
Tsawg - tsis pom zoo ib leeg
Ceev faj nrog cov muab tub lim: Cov khoom ntim ntau dhau yuav cuam tshuam qhov yooj yim thiab cov khoom tsis-stick ntawm cov khoom tiav. Yuav tsum tshuav nyiaj li cas.
Surface condition - Hydrophobic tab sis tsis txiav txim siab
Lub hydrophobic PTFE txheej muaj lub siab dej sib cuag lub kaum ntse ntse (feem ntau 110-120 °), txwv tsis pub cov dej tsis tu ncua ntawm cov yeeb yaj kiab tsim rau saum npoo thiab ua rau txo qis vapor nkag mus rau lub zog tsav tsheb.
Txawm li cas los xij: Qhov zoo ntawm qhov saum npoo no tsis tuaj yeem cuam tshuam qhov cuam tshuam tsis zoo uas tshwm sim los ntawm cov txheej txheem sab hauv. Yog tias muaj micropores lossis kab nrib pleb, dej vapor tseem yuav nthuav tawm los ntawm qhov tsis hais txog ntawm qhov chaw hydrophobicity.
Qhov xwm txheej
Impact on WVTR
Tswv yim tswj
Intrinsic PTFE crystallinity
Lub hauv paus nruab nrab
Tsau - tsis tswj tau hauv cov khoom
Micropores los ntawm tsis tiav sintering
High (tsim shortcuts)
Optimize sintering profile - qeeb qeeb, txias dua
Microcracks los ntawm thermal expansion mismatch
Siab heev
Multi-txheej txheej, nruab nrab FEP txheej, qeeb qeeb
Fiber wicking (tsis tiav encapsulation)
Siab
Xyuas kom tag nrho impregnation - lub tshuab nqus tsev pab rau cov ntaub tuab
Txheej thickness (ib txheej)
Tsawg
Tsis zoo ib leeg
Multi-txheej txheej
High (npog qhov tsis xws luag)
Qhia 2-4 impregnation passes
Lamellar fillers (mica, iav flakes)
Siab heev (labyrinth effect)
Ntxiv 10-20 wt%, optimize dispersion
Sau + ntau txheej ua ke
Siab tshaj (<10 g / m² · hnub)
Qhov zoo tshaj plaws rau cov ntawv thov kev thaiv qhov tseem ceeb
Thaum kawg tshem tawm: Thaum PTFE nplaum daim kab xev yog thov rau high-humidity sealing, txheej txheem-induced txheej flaws (micropores, tawg, fiber ntau wicking) nyob rau hauv lub biggest tsis muaj zog ntawm nws barrier muaj peev xwm. Kev ruaj ntseg sealing yog pom tau los ntawm kev kho mob densification nrog rau ntau txheej txheej thiab muab tub lim hloov . PTFE composite daim kab xev ua raws li ib qho kev cia siab rau ntau qhov kev cuam tshuam nyob rau hauv cov xwm txheej hnyav uas yuav tsum tau ua kom muaj cua sov, tiv thaiv corrosion, av noo ruaj khov, thiab tsis yog-stick tso tawm kev ua tau zoo ib txhij - tab sis tsis yog ib qho kev tiv thaiv ultra-siab zoo li hlau ntawv lossis PVDC.
Hauv cov ntsiab lus , cov dej vapor barrier khoom ntawm PTFE nplaum daim kab xev tsis yog txiav txim los ntawm PTFE's hydrophobicity ib leeg. Intrinsic PTFE yog ib qho teeb meem nruab nrab (WVTR 5-10 g / m² · hnub rau cov yeeb yaj kiab tsis muaj teeb meem). Txawm li cas los xij, cov ntaub ntawv siv tau raug kev txom nyem los ntawm micropores, microcracks (los ntawm thermal expansion mismatch nrog fiberglass), thiab fiber wicking - tsa WVTR rau 50-200 g / m² · hnub.
Txhawm rau ua tiav WVTR qis (<15 g / m² · hnub), qhia ntau txheej txheej (3+ impregnation dhau) thiab / lossis hloov kho lamellar muab tub lim (10-20 wt% mica lossis iav flakes). Cov nyhuv labyrinth los ntawm cov fillers yuam dej vapor mus rau txoj kev winding, txo qis kev sib kis. Txawm li cas los xij, kev thauj khoom siab siab tuaj yeem txo qhov yoog raws thiab kev ua haujlwm tsis zoo - yuav tsum muaj qhov sib npaug.
Xav tau ib tug low-WVTR PTFE nplaum daim kab xev rau ya raws-sensitive sealing? Aokai PTFE muaj ntau txheej txheej txheej thiab muab tub lim-hloov qib nrog cov ntaub ntawv WVTR cov ntaub ntawv xeem. Tiv tauj peb nrog koj qhov xav tau WVTR, kev ua haujlwm kub, thiab kev xav tau yooj yim.
Cov ntsiab lus muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.
Yog tias koj xav tau cov ncauj lus kom ntxaws, daim ntawv thov kev taw qhia, thiab cov kev daws teeb meem rau peb cov khoom lag luam tag nrho suav nrog PTFE high-temperature daim ntaub, PTFE high-temperature adhesive tape, PTFE mesh conveyor siv, seamless fuser siv, ib sab PTFE npuag, high-temperature resistant conveyor siv thiab heatproof , thov hu rau peb.
Upholding lub lag luam lub tswv yim ntawm professionalism thiab kev ncaj ncees, peb mob siab rau peb tus kheej los muab customized one-stop kev daws teeb meem thiab kev xav rau cov neeg siv khoom.
