Yu dɔn ɛva tray fɔ yuz ɔdinari tep na friza? I kin tɔn stif, i nɔ kin stika igen, ɛn i kin krak we i bɛn am. Fɔ PTFE ay-tɛmpracha tep we dɛn kin yuz na lɔw-tɛmpracha ɛnvayrɔmɛnt – frɔm kol stɔrɔj to krayojɛnik paip layn – di adhesive’s glas transishɔn tɛmpracha (Tg) de mek ɔl di difrɛns.
silikon prεshכn-sεnsitiv adhesive gεt wan ekstrim lכw Tg we de arawnd -120°C . Dis na di hiden rizin we mek PTFE tep de stil fleksibul ɛn adhesive na tɛmpracha we smɔl lɛk -70°C.
Aokai PTFE dɔn stɔdi dis prɔpati bɔku bɔku wan. Dis atikul de ɛksplen di sayɛns biɛn Tg ɛn aw i de afɛkt di tep pefɔmɛns na kol kɔndishɔn.
Wetin Na Glas Transishɔn Tɛmpratura (Tg) ɛn Wetin Mek I Impɔtant?
di glas transishכn tεmprachכ (Tg) na di pכynt we wan polimכr de chenj frכ m wan sכft, rכba stet to wan had, brital glas stet . we tεmprachכ dכn dכn Tg, di polimכr mכlikul chen dεm de friz, we de lכs fכ fכm εn di abiliti fכ adhesive.
Fɔ prɛshɔn-sɛnsitiv adeziv dɛn:
Abov Tg: Chen dεm de muv fri wan → adhesive de stכft, stika, εn kin wet surface
Dכn Tg: Chen dεm de fכz → adhesive de at, i de lכs tak, εn i de bi brittle
Wetin mek silikon PSA spɛshal: I Tg we na -120°C rili smɔl we yu kɔmpia am wit akrilik adhesives (Tg arawnd -20°C to -30°C). dis min se silikon de stil elastik εn stika akraos wan bכku wayda tεmprachכ rεnj – frכm -70°C te to 260°C.
di rilayshכn bitwin Tg εn adhesive pεrformεns nכto simpul on/off switch. ivin 30°C oba Tg, mכlikul mobiliti stil limited; di adeziv kin bi ‘lɛda’ pas fɔ ful-ɔp wit rɔba. fכ PTFE tep aplikεshכn dεm dכn -50°C, di adeziv mכst mεnten wan ‘rכba pletכ' mכdulus bitwin 104 εn 106 Pa. Silikכn PSA de ajɔst dis dכn to bכt -80°C biכs fכ in fleksibul siloksan bakbכn (–Si–O–Si–). Akrilik adhesives, wit stiff kabon-kabon bakbon, tipikli los tak below -30°C. Dis de ɛksplen wetin mek na silikon-bɛs PTFE tep nɔmɔ dɛn kin rɛkɔmɛnd fɔ friza aplikeshɔn (-30°C to 0°C) ɔ krayojɛnik ɛnvayrɔmɛnt.
Microscopic Influence Mekanism of Tg pan PTFE Tep
Di ɔvala lɔw-tɛmpracha pefɔmɛns fɔ PTFE ay-tɛmpracha tep na ɔl tu di adeziv layt ɛn di PTFE sabstret jɔyn fɔ disayd . PTFE insεf gεt Tg bak we na lεk -120°C – we rili sεm lεk silikon PSA.
Tɛmpratura Rɛnj
Stet we de adhesive
PTFE Sabstret Stet
Ɔl di Tep Biɛvhɔ
Abov Tg (>-120°C, fכ egzampl, -70°C)
Rɔba, i kin stika
Ajɔst
Gud adhesion, kin bɛn witout krak
Klostu to Tg (arawnd -120°C)
Transishɔn zon
Transishɔn zon
Ridyus bɔt stil de wok
Dכn Tg (<-120°C, fכ egzampl, -180°C)
Glassy, i kin brok
Strikt
Adhesion essentially lɔs; tep kin bi brit
Ki insayt: As lɔng as di savis tɛmpracha de fa ɔp Tg (ɛgz., -70°C, we na 50°C ɔp -120°C), ɔl tu di adeziv ɛn di sabstret de kɔntinyu fɔ de na wan ayli ɛlastik stet, we de garanti fayn fayn lɔw-tɛmpracha fleksibiliti ɛn stebul adheshon.
Aokai PTFE’s thermal analysis lab dכn kכnfכm se silikon PSA de mεnten ova 80% pan in rum-tεmprachכ pil trεnk na -70°C, we akrilik PSA de lכs mכr dan 90% dכn -30°C. Dis data de alayns wit di Tg difrɛns.
Insay aktual krayojɛnik yus (ɛgz., mask tep fɔ low-tɛmpracha plasma sprɛy ɔ tɛmporari fikseshɔn insay likwid naytrɔjen dɛwar), yuza dɛn kin mistek blem di PTFE film fɔ krak we di rial kulprit na di adeziv. we di adeziv friz dכn in Tg, i de lכs komplians εn i nכ kin abzכp bεnd strεs. afta dat di strεn de tכn to di PTFE sabstεrayt, we kin stil fleksibul, bכt di adhesive in stif layεr de akt lεk strεs kכnsantreta, we de initiate krak krak na di adhesive-substrate intafεys. di sכlushכn nכto fכ yuz wan tik PTFE film, bכt fכ mek sכh se di adhesive de rεst oba in Tg. fכ ekstrim krayojenik kכndishכn dεm we de dכn -150°C, ivin silikon PSA de bi marginal. If na so i bi, i fayn fɔ mek dɛn yuz mɛkanikal fastɛns (klam, skru) ɔ PTFE tep dɛn we nɔ gɛt adhesive, bikɔs nɔ PSA nɔ go ebul fɔ wok ɔnda -180°C.
Impekt pan Lɔw-Tɛmpratura Adheshon ɛn Fleksibiliti
1. Adheshon na Difrɛn Tɛmpratura
Tɛmpratura Rɛnj
Di Lɛvɛl fɔ Adhesion
Fɔ ɛksplen
-70°C to 0°C
Wɛl dɔn
Fa oba Tg → mכlikul chen dεm we de aktv, gud wet εn εnεji disipεshכn
-100°C to -180°C
I dɔn ridyus
Molecular motion restricted, bɔt silikon stil de wok pas akrilik
di ultra-low Tg (-120°C) de mek di adhesive ebul fכ kip elasticity εn softness ivin na -70°C, ifektivli prεvεnt brittle krak. di tep kin bεn, rap, εn wund fri wan we nכ brit fraktכs – i nכ lεk כdinari adhesive tep dεm we de krak na kol envayroment.
Sɔma & Aplikeshɔn Gaydlain
Di lɔw glas transishɔn tɛmpracha fɔ silikon PSA de mek PTFE ay-tɛmpracha tep ebul fɔ mentɛn stebul viskɔsiti ɛn fleksibiliti ɔnda lɔw-tɛmpracha kɔndishɔn.
Selekshɔn gayd bay tɛmpracha rɛnj:
Tɛmpratura fɔ di Savis
Prodak we dɛn kin rɛkɔmɛnd
Notis dɛn
≥ -70°C na di wɔl
Standart PTFE tep wit silikon PSA
Ful fayn fɔ bɔku pan di kol aplikeshɔn dɛn (friza, kol klaymat)
-70°C to -180°C
Speshal modifyed ultra-low temperechur resistant PTFE tep
I kin nid fɔ mek dɛn mek am kɔstɔm
≤ -180°C na di wan
Adhesive-fri pure PTFE film + mekanik fikseshɔn
PSA adheshon kin bi unreliable
Notis dɛn bɔt aw fɔ kip tin dɛn ɛn aw fɔ yuz am:
Stɔr tep hεmɛtik wan na kol, dray ples dɛn akɔdin to di tɛknikal spɛsifikɛshɔn dɛn
fכ lכw tεmprachכ aplikεshכn (εgz., fכ aplay tep na kol envayroment), prεhεt כl tu di tep εn di bonding surface fכ impruv di initial adheshon
Nɔ put tep dɔŋ 0°C we yu nɔ wam – ivin silikon PSA nid fɔs kɔntakt ɔp Tg fɔ mek i wet fayn
In sɔmari , di ɔlta-lɔ glas transishɔn tɛmpracha (-120°C) fɔ silikon prɛshɔn-sɛnsitiv adeziv na wetin mek PTFE ay-tɛmpracha tep yunik wan we fit fɔ kol ɛn krayojɛnik ɛnvayrɔmɛnt. pan tap we akrilik tep dεm de fεl dכn -30°C, silikon-bεys PTFE tep de stil fleksibul εn stika dכn to -70°C – εn i kin liv bכku lכw tεmprachכ wit ridyus adheshon.
Fɔ mɔs industrial kol aplikeshɔn (friza, kol chen ikwipmɛnt, ɔda instɔleshɔn insay winta), standad PTFE tep wit silikon PSA de wok rili. Fɔ dip krayojɛnik wok, kɔl spɛshal pɔsin – ɛn tink bɔt mɛkanikal fikseshɔn dɔŋ -150°C.
Nid PTFE tep fɔ yuz am we nɔ gɛt bɛtɛ tɛmpracha? Aokai PTFE de gi standad ɛn modifyed gred fɔ difrɛn kol ɛnvayrɔmɛnt dɛn. Kɔntakt wi tɛknikal tim wit yu tɛmpracha rɛnj ɛn diuti saykl.
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