Thaum twg PTFE high-temperature adhesive daim kab xev yog siv nyob rau hauv daim ntawv thov uas muaj kev ruaj ntseg nro, clamping quab yuam, los yog tas mus li load - xws li tuav rwb thaiv tsev nyob rau hauv qhov chaw ntawm ib tug kub yeeb nkab, los yog ua raws li ib tug structural daim ntawv cog lus nyob rau hauv tsis tu ncua kev nyuaj siab - ib tug zais teeb meem yuav tshwm sim: creep.
Creep yog qhov qeeb, mus tas li deformation ntawm cov khoom nyob rau hauv tas li load dhau sijhawm. Nyob rau hauv chav tsev kub, PTFE daim kab xev yuav zoo li ruaj khov. Tab sis ntawm 200 ° C los yog txawm 260 ° C - nws cov kev khiav hauj lwm ntau yam - cov nplaum txheej tuaj yeem muag thiab ntws, thiab PTFE substrate tuaj yeem ua rau 'txias ntws' (kub hauv qab nws cov ntsiab lus melting).
Aokai PTFE tau kuaj tus cwj pwm nkag mus thoob ntau txhiab teev. Kab lus no piav qhia txog yuav ua li cas creep yog soj ntsuam, yuav ua li cas cov nplaum txheej thiab substrate txhua pab, thiab cov ntaub nplaum uas tiv taus creep zoo tshaj plaws.
Dab tsi yog Creep hauv PTFE Daim Kab Xev - Ob Qhov Loj
Creep tseem ceeb yog hais txog cov lus teb viscoelastic ntawm cov ntaub ntawv. Cov nplaum txheej thiab substrate muaj nuj nqi ntawm cov txheej txheem sib txawv, tab sis ob qho tib si cuam tshuam rau tag nrho cov deformation tsis kam.
Cheebtsam |
Creep Mechanism |
Yam Tseem Ceeb |
Adhesive txheej (silicone PSA) |
Viscous ntws nyob rau hauv sustained shear stress |
Crosslink ceev, molecular hnyav, muab tub lim, txheej thickness |
Substrate (PTFE coated ntaub) |
Cold flow (polymer saw zawv zawg) |
Fiberglass reinforcement, muab tub lim hloov, impregnation zoo |
Kev sib tw ua haujlwm: PTFE tapes feem ntau ntsib qhov loads tas li ntawm 200-260 ° C, deb tshaj qhov txwv ntawm cov pa nplaum-rhiab heev. Yuav tsum tau kuaj xyuas qhov kub thiab txias.
Adhesive Layer Properties - Silicone PSA
Feem ntau PTFE nplaum daim kab xev txais yuav silicone-raws li siab-rhiab nplaum nplaum, uas nws high-temperature creep kuj nyob ntawm cov nram qab no yam:
Qhov xwm txheej |
Qhov cuam tshuam rau Creep Resistance |
Kev taw qhia zoo |
Crosslink ceev |
Cov ntaub ntawv crosslinking siab dua ua kom tiav elastic network → qis qis mus tas li deformation |
Nce (tab sis tsis siab heev uas pib tack ploj) |
Molecular hnyav & qauv |
Siab molecular hnyav + vinyl / phenyl hloov kho → txhim kho cohesive zog |
Siab dua MW, phenyl silicone rau kub kub |
Filler reinforcement (xws li fumed silica) |
Txhim khu lub zog cohesive, ua kom elastic rebound (xws li roj hmab) vs. viscous flow (xws li zom cov pos hniav) |
Ntxiv 5-15% reinforcing muab tub lim |
Adhesive txheej thickness |
Thicker txheej pub ntau shear slippage → siab dua creep nyob rau hauv tib lub load |
Siv nyias, txheej txheej rau kev siv tshuaj tiv thaiv |
Interfacial adhesion |
Kev sib raug zoo tsis zoo ua rau cov nplaum nplaum los ntawm substrate → interfacial slippage (tsis yog bulk creep) |
Siv silicone primer, xyuas kom huv si |
Cov ntsiab lus tseem ceeb: Hauv qab-crosslinked silicone nplaum raug kev txom nyem nrawm nrawm ntawm qhov kub siab. Premium anti-creep tapes siv high-crosslink-density silicone nrog reinforcing fillers thiab tswj nyias txheej.
Aokai PTFE high-temperature tape siv high-crosslink-density silicone PSA nrog fumed silica reinforcement. Kev ntsuas kev ywj pheej zoo li qub ntawm 260 ° C (1000g load, 12.5 × 25 mm sib tshooj) qhia> 150 teev rau qhov tsis ua haujlwm - tsim nyog rau kev thov cov ntawv thov kub tsis tu ncua.
Substrate Properties – PTFE Coated Fiberglass vs. Ntshiab PTFE Zaj duab xis
Ob lub ntsiab substrates yog siv rau PTFE tapes, nrog drastic sib txawv creep kev kawm:
Hom substrate |
Creep Resistance |
Mechanism |
Pure PTFE zaj duab xis |
Tsis zoo - nws yog qhov paub zoo txog qhov txias txias (txias creep). Txawm tias nyob rau hauv me me qhov loads deb ntawm melting point (327 ° C), irreversible loj deformation tshwm sim vim molecular saw zawv zawg. |
Unreinforced polymer → chains swb dhau ib leeg nyob rau hauv kev nyuaj siab |
Fiberglass ntaub impregnated nrog PTFE (dominant rau high-temperature daim kab xev) |
Zoo heev - woven fiberglass skeleton zoo inhibits PTFE txias txaus |
Composite qauv: iav fibers nqa load, PTFE muab tsis-stick |
Rau fiberglass-reinforced substrate, creep kuj yog txiav txim los ntawm:
Qhov xwm txheej |
nyhuv |
Weave ntom thiab thickness |
High-density, hnyav-hnav ntaub → siab tensile modulus → tsawg creep |
Hloov kho PTFE |
Additives (fiberglass hmoov, graphite, carbon fiber) txwv PTFE molecular zog → boost substrate rigidity thiab creep kuj |
Npuag kho & tag nrho impregnation |
Siab sintered PTFE kiag li encapsulating fiberglass cov ntaub ntawv kev sib xyaw kom tsis txhob interlayer shear slip. Tsis txaus impregnation → residual PTFE hauv ntaub meshes creeps nyob rau hauv load |
Substrate thickness & flatness |
Thick, uniformly ca substrates → siab flexural rigidity → txawm tias kev ntxhov siab faib → tiv thaiv lub zos ntxov ntxov creep los ntawm kev ntxhov siab concentration |
Cov ntsiab lus tseem ceeb: Rau qhov kev siv qhov kub thiab txias tsis tu ncua, tsis txhob siv cov ntaub nplaum PTEF ntshiab - nws yuav nkag mus tsis tau. Ib txwm xaiv fiberglass-reinforced PTFE daim kab xev.
Summary - Yuav ua li cas kom ntseeg tau Creep Resistance nyob rau hauv PTFE daim kab xev
Qhov xwm txheej |
Yuav Nrhiav Dab Tsi |
Yuav zam li cas |
Adhesive hom |
High-crosslink-density silicone PSA nrog fumed silica muab tub lim |
Hauv qab-crosslinked silicone, acrylic PSA (creeps ntawm qis temp) |
Adhesive thickness |
Nyias, txheej txheej (lub hom phiaj 0.02-0.05 hli) |
Thick-adhesive txheej (> 0.08 hli) - tso cai rau shear slippage |
Hom substrate |
Fiberglass-reinforced PTFE |
Pure PTFE zaj duab xis (txias creeps) |
Substrate zoo |
High-density weave, tag nrho impregnated, tag nrho sintered |
Loose weave, tsis txaus impregnation, ib nrab sintered |
Interfacial sib txuas |
Primer kev kho mob ntawm cov nplaum thiab substrate |
Tsis muaj primer → adhesive peeling es tsis txhob bulk creep |
Cov tswv yim pom zoo: Rau qhov tsis tu ncua-load high-temperature daim ntaub ntawv (xws li, yeeb nkab rwb thaiv tsev qhwv nyob rau hauv nro, tuav cov khoom ntawm rhuab platens), thov cov ntaub ntawv zoo li qub shear ntawm koj qhov kub thiab txias. Qhia meej fiberglass-reinforced PTFE daim kab xev, tsis yog zaj duab xis daim kab xev. Xyuas kom tseeb tias cov nplaum yog high-crosslink-density silicone nrog muab tub lim.
Nyob rau hauv cov ntsiab lus , lub creep kuj ntawm PTFE high-temperature nplaum daim kab xev nyob rau hauv lub sij hawm ntev load nyob rau hauv ob yam. Cov txheej silicone PSA yuav tsum muaj qhov sib txawv ntawm qhov sib txuas siab, txhawb nqa cov khoom siv (fumed silica), thiab nyias txheej txheej los tiv thaiv cov dej khov. Lub substrate yuav tsum yog fiberglass-reinforced PTFE - ntshiab PTFE zaj duab xis yuav undergo irreversible txias creep ntawm kub. Cov pob txha fiberglass nqa lub nra thiab ua kom cov khoom sib xyaw kom ruaj khov.
Thaum xaiv PTFE daim kab xev rau tas li-load high-temperature daim ntaub ntawv, tsis txhob khom rau ntshiab PTFE zaj duab xis daim kab xev. Nco ntsoov nug cov ntaub ntawv zoo li qub ntawm koj qhov kev ua haujlwm kub. Thiab nco ntsoov: kev sib raug zoo ntawm cov nplaum thiab substrate tseem ceeb heev - primer-kho interfaces tiv thaiv interfacial plam.
Xav tau ib tug creep-resistant PTFE daim kab xev rau high-temperature load tas li? Aokai PTFE muaj fiberglass-reinforced daim kab xev nrog high-crosslink-density silicone PSA, validated los ntawm 260 ° C zoo li qub shear xeem. Tiv tauj peb nrog koj cov load, qhov kub thiab txias, thiab lub sijhawm xav tau.
Kab lus muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.
Yog tias koj xav tau cov lus qhia ntxiv, daim ntawv thov kev qhia, thiab cov kev daws teeb meem rau peb cov khoom lag luam tag nrho suav nrog PTFE high-temperature daim ntaub, PTFE nplaum daim kab xev, PTFE mesh conveyor siv, seamless fuser siv, ib sab PTFE ntaub, high-temperature resistant conveyor siv thiab tshav kub-resistant fiberglass daim ntaub , xav tias dawb hu rau peb:
Peb ua raws li kev tshaj lij thiab kev ncaj ncees, mob siab rau kev xa tawm ib qho kev daws teeb meem thiab xav txog kev txhawb nqa tom qab muag!
