Politetrafluoroethylene (PTFE) na wan kabɔn ɛn fluorine polima. Dis matirial gɛt di nem we pipul dɛn sabi pas ɔl: Teflon.
Di prɔpati dɛn we PTFE gɛt na:
Eksɛlɛnt mɛkanikal prɔpati dɛn (<1%) .
Kεmikכl inertness kכrכshכn rεsistεns
Di tin we de mek pɔsin nɔ wam
Di kɔfishin dɛn we smɔl pas ɔl fɔ frikshɔn
Nɔn stik prɔpati(witstand kɔntinyu ay tɛmpracha we na 500°f (260°c))
Wear resistans fɔ wɛr
Ay mɛlt pɔynt
Di fayn fayn prɔpati dɛn we PTFE gɛt de gi am bɔku bɔku aplikeshɔn dɛn, ɛn dɛn kin yuz am mɔ as nɔ-stik kɔtin fɔ kuk. PTFE in bɛtɛ wear resistans alaw am fɔ kam togɛda wit difrɛn matirial dɛn tru emulshɔn polimɛrayzeshɔn ɔ suspension polimayzeshɔn prɔsesin fɔ fɔm ay tɛmal-rɛsistɛns industrial prodak wit fayn fayn mɛkanikal prɔpati dɛn, lɛk waya insuleshɔn, fud-grɛd kɔnvayɔr bɛlt, fleksibul nɔ-stik fabrik, ɛn ɔda tin dɛn.
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Dɛn bin fɛn politetrafluoroethylene insay 1938. Na wan Amɛrikin kemist Roy J. Plunkett (1910–1994) bin fɛn am fɔs we i bin de tray fɔ mek nyu kabɔn ɛn fluorine kɔmpawnd friji. Pipul dɛn da tɛm de nɔ bin fɔ dɔn tink bɔt dis ɔdinari prɔdak. Strenj katalis go afɛkt ɔltin na di wɔl.
Insay 1941, DuPont bin gɛt patɛnt fɔ dis prɔdak ɛn i bin rɛjista wan tredmak ɔnda di nem 'Teflon' insay 1944.
Naw, dɛn dɔn de yuz polytetrafluoroethylene bɔku bɔku wan pan bɔku tin dɛn we dɛn de mek ɛn layf. Insay di ketɛning industri, dɛn kin yuz PTFE kɔt kuk tin dɛn bɔku bɔku wan; na di klos industri, top kol-pruf klos frɔm brand dɛm lɛk HELIKON ɛn Carinthia ɔl de yuz PTFE as di kɔtin ɔ ɔta layt. , fɔ mek dɛn ebul fɔ bia wit di bad bad kol we na -30°C; insay di soja fil, dɛn de yuz PTFE matirial dɛn we nɔ gɛt bɔku lɔs, we gɛt fayn fayn dayelɛktrik prɔpati, we gɛt gud kɔnsistɛns, we gɛt stebul kemikal prɔpati, ɛn we nɔ gɛt mɔstɔ absɔpshɔn bɔku bɔku wan na ay redio frikshɔn reda panɛl dɛn. Insay di mɛdikal fild, dɛn kin yuz PTFE matirial dɛn bak bɔku bɔku wan na atifishal bɔdi pat dɛn.
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PTFE tinap fɔ polytetrafluoroethylene, di kεmikכl tεm fכ di polimכr (C2F4)n.
Dis matirial jεnarali de rifer to eni branded ptfe sεntetik fluoropolymer. di men kכntribyushכn dεm fכ polytetrafluoroethylene na dεn wan ya:
Maksimal ɔpreshɔn tɛmpracha (°F /°C): 500/260
Tεnsil Strεngth at Brek (PSI): 4,000
Dielektrik konstant (kV/mil): 3.7
Di prɔpɔshɔn: 2.16
Elongation na brek: 350% .
Shore D Hadnɛs: 54. Di wan dɛn we de wok
Di ptfe polytetrafluoroethylene sintetik fluoropolymer we dɛn de yuz bɔku bɔku wan wit di kwaliti dɛn we de ɔp dɔn ɔlrɛdi gɛt bɔku bɔku brand dɛn, di men brand dɛn na dɛn wan ya:
TEFLON®: Kεmכr dεm
FLUON®: AGC Ltd. we de wok fɔ di kɔmni
DYNEON®: 3M. Di wan dɛn we de wok
PƆLIFLƆN: Daikin Indastrial Kɔmni, Ltd.
ALGOFLON: Sɔlvay Ltd. we de wok fɔ di kɔmni.
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Politetrafluoroethylene na wan linya polimכr we kכmכp fכ kabכn (C) εn fluorine (F) atכm dεm, wit di kεmikכl fכmula (C2F4)n, usay n na di nכmba כf mכnomεr yunit dεm.
di strכkchכ fכ PTFE kin εksprεs as: -CF2-CF2-CF2-CF2-
di lכng chen fכ PTFE mכlikul dεm na kכbכn atכm dεm, εvri wan pan dεm de lεnk to tu fכrin atכm dεm.
Fluorine atom dεm kכlכsכl kכba di sεf fכ di kabכn atכm dεm na di spiral polimכr chen. di kabכn atכm dεm de fכm di men chen fכ di polimכr chen. di fluorine atom dεm de fכm wan strכkchכ we lεk shild rawnd di kabכn atכm dεm, we de protεkt di intanεt kabכn atכm dεm fayn fayn wan.
Dis yunik arenjmɛnt fɔ atɔm dɛn de gi PTFE in ɛksɛpshɔn prɔpati dɛn. dis mכlikul strכkchכ de kכntribyut to PTFE in fכshal εn kεmikכl prכpati dεm we nכ kכmכt.
Wetin Na Di Teflon Matirial?
Teflon na thermoplastic fluoropolymer, ɛn Teflon akronim na PTFE (polytetrafluoroethylene).
Teflon na tredmak fɔ Chemours, bɔt, yu kin bay PTFE bak frɔm ɔda kɔmni dɛn pas Chemours.
Teflon na wan pɔpul matirial bikɔs i nɔ gɛt frikshɔn, i nɔ gɛt bɔku tɛmpracha, ɛn i nɔ de mek kemikal.
Na tru se, Teflon na polimכr mεtirial we dεn polimכrayz frכm tεtrafluoroethylene εn na wan kayn pεrfluorinated mεtirial. I kemikal nem na polytetrafluoroethylene (PTFE).
Teflon kemikal strɔkchɔ rili spɛshal. di mכlikul strכkchכ na dat F (fluorine atom dεm) de riples כl di H (haydrojen atom dεm) na di C chen. Na di sem tɛm, bikɔs di rayus fɔ di fluorine atɔm big pas di rayus fɔ di kabɔn atɔm, di ripulshɔn bitwin di atɔm dɛn rili big, so i nɔ go Lɛk di haydrojɛn atɔm dɛn, dɛn kin arenj dɛn na wan plen, so di fluorine atɔm dɛn kin ɔlmost spiral ɔp fɔ rap di kabɔn atɔm dɛn, so dat di ɔdasay wɔl kin jɔs kam in kɔntakt wit di rili inert fluorine atɔm dɛn.
Wit wan strכng fluorine atom barεri, di Teflon polimכr strכkchכ na rili stebul kכmpεr to כda mεtirial dεm.
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PTFE na polimכr we polimεrayz frכm tεtrafluoroethylene monomer. Na transparent ɔ opaque waks we fiba PE. in density na 2.2g/cm3 εn in wata absכpshכn rεt less dan 0.01%.
di kεmikכl strכkchכ fכ PTFE polimכr sכm kayn we lεk di wan fכ PE, εksεpt se כl di haydrojεn atכm dεm na polyethylene de riples wit fluorine atכm dεm. Bikɔs ɔf di ay bon ɛnaji ɛn stebul pefɔmɛns fɔ di CF bond, i gɛt fayn fayn kemikal kɔrɛshɔn rɛsistɛns ɛn i kin ebul fɔ bia wit ɔl di strɔng asid dɛn (inklud akwa regia) pas di mɔlt alkali mɛtal dɛn, ɔksidayzin midia, ɛn sɔdiɔm haydroksayd we pas 300°C. As well as di ifekt dεm fכ strכng כksidεnt dεm, ridyusin ejen dεm εn difrεn כrganik sכlvεnt dεm.
Di F atכm na di PTFE mכlikul na simetrikal, εn di tu εlimεnt dεm na di CF bכnd na kכvalεnt bכnd. No fri εlektrכn nכ de insay di mכlikul, we de mek di כl mכlikul nyutral. So, i gɛt fayn fayn dayelɛktrik prɔpati, ɛn in ilɛktrik insuleshɔn nɔ afɛkt di inflɛns pan di envayrɔmɛnt ɛn frikshɔn.
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I volyum rɛsistiviti pas 1017, in dayelɛktrik lɔs smɔl, in brekdɔwn vɔlɔt ay, in ark rɛsistɛns gud, ɛn i kin wok na ilɛktrik ɛnvayrɔmɛnt we gɛt 250°C. biכs nכ haydrojεn bכnd nכ de na di PTFE mכlikul strכkchכ, di strכkchכ na simetrikal, so in kristכlayzeshn Di digri fכ kristalizεshכn rili hכy (jεnarali di kristaliniti na 55%~75%, sכmtεm i hכy as 94%), we de mek PTFE rili hεt-rεsistant. I mɛlt tɛmpracha na 324C, in dikɔmpɔzishɔn tɛmpracha na 415°C, ɛn in maksimal yus tɛmpracha na 250°C. I brit Di tɛmpracha na -190°C, ɛn di ɔt distɔshɔn tɛmpracha (ɔnda 0.46MPa kɔndishɔn) na 120C.
Teflon matirial gɛt gud mɛkanikal prɔpati. I tɛnsiɛl trɛnk na 21 ~ 28MPa, bɛnd trɛnk na 11 ~ 14MPa, elongashɔn na 250% ~ 300%, ɛn in dinamik ɛn statik frikshɔn kɔfishin agens stɛl na ɔl tu 0.04, we bɛtɛ pas naylon, polyformaldehyde, ɛn polyethylene. Di kɔfishin fɔ frikshɔn fɔ kol plastic dɛn smɔl.
Pure PTFE gɛt lɔw trɛnk, po wear resistans ɛn po krip resistans. כltεm i nid fכ ad sכm inכgεnik patikyula dεm to di PTFE polimכr, lεk grafayt, disulfayd grup, aluminiכm oksayd, glas fayba, kabכn fayba, εtk fכ impruv in mεkanikal prכpati dεm. .
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Di manufakchurin prɔses de yuz klorofɔm as raw matirial, yuz anhaydrous haydrofluoric asid fɔ fluorine klorofɔm, di riakshɔn tɛmpracha de ɔp 65oC, yuz antimoni pentachloride as katalis, ɛn las wan yuz tɛmal krak fɔ prodyuz tetrafluoroethylene.
Aokai de prodyuz yuz suspεns polimεrayzeshn כ emulshכn polimεrayzeshn.
Prεparashכn כf monomεr tεtrafluoroethylene
Indastrial, dɛn de yuz klorofɔm as raw matirial, dɛn de yuz anhaydrous haydrofluoric asid fɔ fluorine klorofɔm, di riakshɔn tɛmpracha de ɔp 65oC, dɛn de yuz antimoni pɛntaklɔrayd as katalis, ɛn las las dɛn de mek tetrafluoroethylene bay tɛmal krak. Tεtrafluoroethylene kin prodyuz bak bay we dεn de riak zink wit tetrafluorodichloroethane pan ay tεmprachכ.
Prɛparashɔn fɔ polytetrafluoroethylene
Insay ɛnamel ɔ stenlɛs stiɛl polimɛrayzeshɔn ketul, dɛn kin yuz wata as di midiɔm, dɛn kin yuz potashɔm pɔsalfɛt as di initiator, dɛn kin yuz pɔrfluorocarboxylic acid amoniɔm sɔl as di dispersant, dɛn kin yuz fluorocarbon as di stabiliza, ɛn dɛn kin yuz tetrafluoroethylene rɛdɔks polimɛrayz fɔ gɛt fayn pauda polyethylene. Tɛtrafluoroɛtilin.
Ad difrεn aditiv dεm to di riakshכn ketul, εn di tεtrafluoroethylene monomer de enta di polimכrayzeshn ketul insay di gas fεz. ajɔst di tεmprachכ insay di ketul to 25°C, dεn ad wan sכm amoun fכ aktibכt (sכdyכm mεtabisulfayt) fכ initiate polimכrayzeshn tru wan rεdכks sistεm. durin di polimכrayzeshn prכsεs, dεn de kכntinyu fכ ad mכnomεr dεm, εn di polimכrayzeshn prεshכn de mεnten na 0.49~0.78MPa. di dispershכn we dεn gεt afta polimεrayzeshn dεn de diluyt am to wan sכm kכnsantreshכn wit wata, εn di tεmprachכ de adjכst to 15~20oC. Afta agregεshכn wit mεkanikal stir, dεn was am wit wata εn drεy, dat na, Dis prodakt dεn gεt am as fayn granul rεsin.
Teflon koting insɛf sef: Teflon matirial insɛf nɔ gɛt pɔyzin, i nɔ go rɔtin, ɛn i nɔ go mek yu gɛt prɔblɛm wit yu wɛlbɔdi. dis kin bi biכs in mכlikul strכkchכ nכ de bεs fכ sכlv insay rial kεmikכl dεm, nכto fכ digεst εn abzכp di mכtalman bכdi.
Lan mɔ bɔt Teflon sef
Wetin Dɛn De Yuz PTFE Fɔ?
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Di spɛshal prɔpati dɛm we PTFE gɛt de mek dɛn yuz am bɔku bɔku wan na industrial ɛn marin ɔpreshɔn lɛk kemikal industri, petrolium, tɛkstayl, it, pepa mek, mɛrɛsin, ilɛktroniks ɛn mashin.
Aplikeshɔn fɔ polytetrafluoroethylene (PTFE) insay anti-kɔrɛshɔn prɔpati dɛn:
Bikɔs ɔf di difrɛns dɛn we de na di kɔrɛshɔn rɛsistɛns fɔ rɔba, glas, mɛtal alɔy ɛn ɔda matirial dɛn, i at fɔ mit di harsh envayrɔmɛnt usay tɛmpracha, prɛshɔn ɛn kemikal midia de togɛda, ɛn di lɔs dɛn we kin apin kin rili ala. Wail PTFE matirial gɛt fayn fayn kɔrɛshɔn rɛsistɛns, polytetrafluoroethylene de yuz di men kɔrɛshɔn-rɛsistɛns matirial dɛn na petrolium, kemikal, tɛkstayl ɛn ɔda industri dɛn.
Spɛshal aplikeshɔn dɛn na: delivri paip, ɛkzoz paip, stim paip fɔ transpɔt kɔrosiv gas, ay-prɛshɔn ɔyl paip fɔ rɔlin mil, ay, midul ɛn lɔw-prɛshɔn paip fɔ ayrakt haydrolik sistem ɛn kol prɛs sistɛm, distileshɔn tawa, ɔt ɛkschenja, ketul, tawa ɛn tank. Di pefɔmɛns fɔ di kemikal ikwipmɛnt sil dɛn lɛk layn ɛn valv gɛt big impak pan di efyushɔn ɛn pefɔmɛns fɔ di wan ol mashin ɛn ikwipmɛnt. PTFE matirial gɛt di kwaliti dɛn we na kɔrɛshɔn rɛsistɛns, ɛj rɛsistɛns, lɔw frikshɔn kɔfishin ɛn nɔ-stik, wayd tɛmpracha rɛnj, ɛn gud ɛlastik, we mek i rili fayn fɔ mek sil dɛn we gɛt ay kɔrɛshɔn rɛsistɛns rikwaymɛnt ɛn ɔpreshɔn tɛmpracha we pas 100°. Lɛk sil fɔ grov flɛnch dɛn na mashin, ɔt ɛkschenja, ay-prɛshɔn vessel, big-dayamita vessel, valv, ɛn pɔmp, sil fɔ glas riakshɔn pɔt, flat flɛnch, big-dayamita flɛnch, shaft, piston rod, valv rod, Wom gia pɔmp, tay rod sil, ɛn ɔda tin dɛn.
2.Di lɔw frikshɔn pefɔmɛns fɔ polytetrafluoroethylene (PTFE) de yuz insay lod aplikeshɔn.
Di frikshɔn pat dɛn na sɔm ikwipmɛnt nɔ fayn fɔ lɔbrik, lɛk insay sityueshɔn usay lɔbrik gris go sɔlv bay sɔlvɛnt ɛn nɔ go wok, ɔ we dɛn de mek pepa, famasitik, it, tɛkstayl, ɛn ɔda tin dɛn bearing) ɔf mɛkanikal ikwipmɛnt pat dɛn. Dis na bikɔs di frikshɔn kɔfishin fɔ dis matirial na di lɔs wan pan di sɔlid matirial dɛn we dɛn no. I Spesifi k yus inklud bia fɔ kemikal ikwipmɛnt, pepa mek mashin, ɛn agrikalchɔral mashin, as piston ring, mashin tul gayd rel, ɛn gayd ring. Dɛn kin yuz dɛn bɔku bɔku wan na sivil kɔnstrɔkshɔn prɔjek dɛn as sɔpɔt slayd fɔ brij, tanɛl stɛl strɔkchɔ ruf trɔs, big kemikal paip layn dɛn, ɛn stɔrɔj tank dɛn. Blɔk, ɛn dɛn kin yuz am bak as brij sɔpɔt ɛn brij swivel, ɛn ɔda tin dɛn.
3.Aplikeshɔn fɔ polytetrafluoroethylene (PTFE) insay ilɛktronik ɛn ilɛktrik aplikeshɔn dɛn.
Di inhɛrɛnt lɔw lɔs ɛn smɔl dayelɛktrik kɔnstant fɔ PTFE matirial dɛn de mek dɛn ebul fɔ mek am insay enamel waya fɔ yuz insay maykro motoka, tɛmokɔpl, kɔntrol divays, ɛn ɔda tin dɛn, PTFE ilɛktrik insuleshɔn film Na wan fayn insuleshɔn matirial fɔ mek kapasitɔ, redio insuleshɔn layna, insuleshɔn kebul, motoka ɛn transfɔma. I de bak wan pan di tin dɛn we nɔ impɔtant fɔ industrial ilɛktronik kɔmpɔnɛnt dɛn lɛk aerospace ɛn aerospace. Di yus fɔ fluorine plastic film gɛt ay permeabiliti to ɔksijɛn ɛn ay permeabiliti to wata vapour. dis selektiv pεrmiabiliti fכ sכm pεrmiabiliti kin yuz fכ mek כksijεn sεns dεm. Di kwaliti dɛm fɔ fluoroplastic we de mek polar chaj dɛvyayshɔn ɔnda ay tɛmpracha ɛn ay prɛshɔn kin yuz fɔ mek maykrofon, spika, pat pan rɔbɔt, ɛn ɔda tin dɛm, ɛn dɛn kin yuz dɛn lɔw rifrakshɔn. di kכntribyushכn dεm fכ hεy efyushכn kin mek optik fayb dεm.
4.Aplikeshɔn fɔ polytetrafluoroethylene (PTFE) insay mɛdikal mɛrɛsin.
di εkspεnd PTFE mεtirial na purely inert εn i gεt vεri strכng bayolojikal adaptabiliti. I nɔ go mek di bɔdi nɔ gri wit am ɛn i nɔ gɛt ɛni fisiɔlɔjik sayd ɛfɛkt pan mɔtalman bɔdi. Dɛn kin sterilayz am bay ɛni we. in maykroporous strכkchכ de alaw fכ yus insay difrεn rihabiliteshכn sכlushכn dεm, inklud atifishal bכdi vεsul dεm εn pat fכ sכft tisu rigεnεreshכn εn sכjεkshכn sutura fכ vaskulכr, kadyak, jεnarכl εn כtpidik כpεrayshכn.
5.Aplikeshɔn fɔ anti-stik prɔpati dɛn fɔ polytetrafluoroethylene (PTFE).
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PTFE matirial gɛt di smɔl smɔl sɔfayz tɛnsiɔn bitwin sɔlid matirial dɛn ɛn i nɔ de adhe to ɛni sɔbstans. I gɛt bak di kwaliti dɛn we gɛt ay ɛn lɔw tɛmpracha rɛsistɛns ɛn kemikal inɛtnɛs, we mek i fayn fɔ aplikeshɔn dɛn lɛk fɔ mek. Nɔn-stik pan dɛn de yuz bɔku bɔku wan fɔ anti-stik aplikeshɔn dɛn. Di anti-adhesive prɔses men wan inklud tu kayn: fɔ instɔl di PTFE sheet pan di sabstret ɛn fɔ put di PTFE kotin ɔ varnish we dɛn kɔmpɔz wit glas pan di sabstret tru ɔt shrinkage.
Lan mɔ bɔt PTFE kɔtin dɛn
Pan ɔl we PTFE matirial dɛn stil gɛt di prɔblɛm we gɛt ay prɔblɛm fɔ wɛldin, wit di advansmɛnt fɔ teknɔlɔji, i nɔ go te igen nyu sɛntesis we dɛn go sɔlv di pen pɔynt dɛn na PTFE ɛn yuz PTFE to wan big rɛnj ɔf fil dɛm.
