Nusi ɖe dzesi le fluoroelastomer (FKM) ŋue nye dzoxɔxɔ si bɔbɔ ƒe tsitretsitsi nyuie o. Zi geɖe la, dzoxɔxɔ si bɔbɔ ɖe megbe ƒe dzoxɔxɔ si le FKM eve me (TR10) nyea -18 va ɖo -16 °C, eye glass ƒe tɔtrɔ ƒe dzoxɔxɔ (Tg) nye -20 °C; dzoxɔxɔ si bɔbɔ ƒe tsitretsitsi ɖe ternary FKM ŋu menyo o wu binary FKM tɔ. FKM tɔxɛ si ƒe dzoxɔxɔ bɔbɔ ƒomevi si te ŋu nɔa te ɖe dzoxɔxɔ si bɔbɔ nu nyuie, gake eƒe asi lolo ŋutɔ.
FKM le ASTM D 2000-2012 'ʋu ƒe rababa nuwɔna dzidzenu hatsotso ɖoɖo' ƒe M2, M5, M6 grade nuwɔna siwo hiã be woato dzoxɔxɔ sue ƒe embrittlement F15 (-25 °C) dodokpɔ me, M4 grade nuwɔna siwo hiã be woato dzoxɔxɔ sue ƒe embrittlement F17 (-40 °C) dodokpɔ me. Le ƒe ʋɛ siwo va yi me la, wobia FKM-nu geɖe wu be woaɖo dzoxɔxɔ si nu sẽ ƒe tsitretsitsi (250-275 °C) kple dzoxɔxɔ si bɔbɔ ƒe gbagbã F15 alo F17 siaa ƒe nudidiwo gbɔ. Mɔ nyuitɔe nye be nàzã FKM si ƒe dzoxɔxɔ le sue, abe brittleness temperature of -45 ~ -40 °C Viton GLT type FKM ene, gake FKM ƒe dzoxɔxɔ gã ƒe dɔwɔwɔ sia menyo o eye esesẽ be woana asi nadze. To eve ƒe dɔwɔwɔ nyuie wu me la, FKM ƒe atike eve ate ŋu aɖo dzoxɔxɔ si bɔbɔ kple esi lolo ƒe nudidiwo gbɔ le ɣeyiɣi ɖeka me, eye ga si woatsɔ awɔe hã sɔ, va zu numekuku ƒe teƒe vevi aɖe.
Agbalẽ sia ku nu me tso FKM ƒe dzoxɔxɔ sue ƒe dɔwɔwɔ ƒe dzesiwo ŋu le Tg, TR10 kple brittleness temperature (Tbri) ƒe ƒomedodo si le sukunuwuwu sukuviwo dome, fillers, mixing process, kple bubuawo le binary kple ternary FKM adhesive low-temperature brittleness performance hena dzadzraɖo ɖe low-temperature-resistant FKM adhesive ŋu be wòana nufiame!
1. FKM ƒe dzoxɔxɔ sue ƒe embrittlement nɔnɔmewo ƒe dzesiwo
Rababa ƒe nɔnɔme trɔna si woate ŋu atrɔ, ate ŋu ana nɔnɔme gã aɖe natrɔ le gotagomeŋusẽ sue aɖe ƒe dɔwɔwɔ te, eye woate ŋu agbugbɔe aɖo eƒe nɔnɔme gbãtɔ me ne woɖe gotagomeŋusẽa ɖa vɔ, eyata wozãnɛ le afisiafi. Gake ne dzoxɔxɔa dzi ɖe kpɔtɔ la, rababa ƒe tete ɖe edzi vivivi, eye ne eɖo Tg la, rababa la megate ŋu nɔa te o eye wòdoa kpo nu. Le rababa ƒe nuwɔna vovovowo ta la, le zazã ƒe ɖoɖoa me la, woate ŋu atsɔe ade ƒoƒo, tete, lãɖeɖe, torsion, extrusion, abrasion, kple bubuawo me, ele be eƒe dzoxɔxɔ sue ƒe embrittlement dɔwɔwɔ nanɔ te ɖe eƒe dɔwɔwɔ ƒe nɔnɔme dzi be woatia dodokpɔmɔnu si sɔ. Dzoxɔxɔ sue embrittlement dɔwɔwɔ dodokpɔ mɔnu siwo wozãna zi geɖe dometɔ aɖewoe nye Tg dodokpɔ, ŋusẽkpɔɖeamedzi brittleness dzoxɔxɔ dodokpɔ, dzoxɔxɔ sue retraction dodokpɔ, dzoxɔxɔ sue torsional rigidity dodokpɔ (Gimen dodokpɔ), tsitretsitsi ɖe keke kple vuvɔ coefficient dodokpɔ, dzoxɔxɔ sue sesẽ dodokpɔ, dzoxɔxɔ sue compression tegbee deformation kple nuteɖeamedzi ɖiɖiɖeme dodokpɔ, kple bubuawo.
Woateŋu ade dzesi FKM ƒe dzoxɔxɔ si bɔbɔ ƒe tsitretsitsi to Tg, Tbri, TR10 kple Torsion Temperature at low temperature (TGem), etc. Gɔmesese vovovowo le parameter siawo ŋu gake ƒomedodo aɖe le wo kple wo nɔewo dome.
(1) Tg nye dzoxɔxɔ si me rababa la trɔna tso nɔnɔme si me wòte ŋu ʋãna ŋutɔ me yia nɔnɔme si me wòle abe ahuhɔ̃e ene me eye nɔnɔme si le abe ahuhɔ̃e ene la trɔna yia nɔnɔme si me wòte ŋu ʋãna ŋutɔ, si zi geɖe dea dzesi rababa ƒe molecule kɔsɔkɔsɔwo ƒe ʋuʋu le nusuekpɔmɔ̃ me.
(2) Tbri nye dzoxɔxɔ si me nu gbegblẽ aɖeke megblẽna le rababa la ŋu le nɔnɔme siwo woɖo ɖi siwo nye ŋusẽkpɔɖeamedzi ƒe ŋusẽ ƒe tɔtrɔ me o, si zi geɖe la, eɖea ŋusẽ si le rababa la ŋu hena zazã le dzoxɔxɔ si bɔbɔ me kple ŋutete si le esi be wòanɔ te ɖe nusiwo gblẽ nu fiana.
(3) Wozãa TR10 tsɔ daa rababa ƒe viscoelasticity kple crystallization ŋusẽkpɔɖeamedzi kpɔ le dzoxɔxɔ si bɔbɔ me, eye zi geɖe la, eɖea dzoxɔxɔ si bɔbɔ wu si me rababa ƒe nu ate ŋu alé eƒe elastic recovery me ɖe asi le.
. Dzogoe si dzi rababa la trɔna le dzoxɔxɔ ƒe tɔtrɔ nu ate ŋu ada eƒe dzoxɔxɔ si bɔbɔ ƒe dɔwɔwɔ kpɔ, zi geɖe la, eɖea dzoxɔxɔ si bɔbɔ wu si me rababa la léa eƒe teteɖeanyi me ɖe asi le.
2 FKM Tg, TR10 kple ƒomedodo si le Tbri dome
FKM low-temperature embrittlement performance parameters siwo wozãna zi geɖe enye Tg, TR10 kple Tbri, zi geɖe la, nudzrala la xɔa parameter Tg kple TR10, ASTM xɔa parameter Tbri, vovototo aɖewo kple ƒomedodo aɖewo le etɔ̃ siawo dome.
2. 1 Ƒomedodo si le Tg kple TR10 dome
TR10 si le FKM ƒe hatsotso ɖesiaɖe me gogo Tg (vovototoa mewu 3 °C o), si fia be Tg kple TR10 siaa ateŋu aɖe dzoxɔxɔ si bɔbɔ ƒe ʋuʋu kple glass nɔnɔme ƒe dzoxɔxɔ si le rababa ƒe molecule kɔsɔkɔsɔ me afia.
2.2 Ƒomedodo si le FKM fluorine ƒe agbɔsɔsɔ kple dzoxɔxɔ si bɔbɔ ƒe ʋuʋudedi ƒe nɔnɔmewo dome
Le FKM eve kple etɔ̃ siwo bɔ me la, TR10 dzina ɖe edzi ne fluorine ƒe agbɔsɔsɔ dzi ɖe edzi; ne woto monomer enelia, PMVE, vɛ la, nusiwo le eme kpɔa ŋusẽ gã aɖe ɖe TR10 dzi.
Eƒe nyawo kpɔa ŋusẽ gã aɖe ɖe TR10 dzi. Togbɔ be fluorine ƒe dzidziɖedzi ate ŋu ana FKM zazã ƒe dzoxɔxɔ ƒe seɖoƒe si le etame nanyo ɖe edzi hã la, le ɣeyiɣi ma ke me la, le CF ƒe kadodoa xɔna ɖe CH ƒe kadodoa teƒe, si ɖea molecule kɔsɔkɔsɔa ƒe fafɛ kple rababa ƒe dɔwɔwɔ le dzoxɔxɔ si bɔbɔ me dzi kpɔtɔna.
2.3 Ŋusẽkpɔɖeamedzi si fillers kpɔna ɖe FKM ƒe atikewo ƒe dzoxɔxɔ si le sue ƒe embrittlement nɔnɔmewo dzi
Carbon black N774 adhesive ye nye Tbri si bɔbɔ wu eye wòte ŋu nɔa te ɖe dzoxɔxɔ si bɔbɔ nu nyuie wu; zinc oxide adhesive ƒe Tbri sɔ gbɔ wu eye dzoxɔxɔ si mebɔ o ƒe tsitretsitsi vɔ̃ɖitɔ kekeake; alesi aŋenu ƒomevi atɔ̃awo wɔa dɔ le dzoxɔxɔ si mebɔ o me meto vovo boo o. Le numekuku megbe la, ne wotsɔ nusiwo wotsɔ yɔa nu vovovowo kpee vɔ la, dometsotso kple wɔwɔme si le FKM molecule kɔsɔkɔsɔwo dome la to vovo, eye dzoxɔxɔ si bɔbɔ ƒe ʋuʋudedi ƒe dɔwɔwɔ si sɔ kplii la to vovo.
Le numekuku vɔ megbe la, ne wotsɔ nusiwo wotsɔ yɔa nu vovovowo kpee vɔ la, dometsotso kple wɔwɔme siwo le FKM molecule kɔsɔkɔsɔwo dome la to vovo, eye dzoxɔxɔ sue ƒe ʋuʋudedi ƒe nɔnɔme siwo sɔ ɖe enu la to vovo, eye nusi wotsɔ yɔa nu si me rababa sue aɖe le la ƒe gel sɔ gbɔ wu eye wòte ŋu nɔa te ɖe dzoxɔxɔ sue nu nyuie wu.
2.4 Ŋusẽ si tsakatsaka ƒe dɔwɔwɔ kpɔna ɖe FKM ƒe atikewo ƒe dzoxɔxɔ si le sue ƒe ʋuʋudedi ƒe nɔnɔmewo dzi
Alesi wotsakae hã kpɔa ŋusẽ ɖe FKM ƒe atikewo ƒe dzoxɔxɔ si mebɔ o ƒe ʋuʋudedi ƒe nɔnɔmewo dzi. Plastic wɔwɔ hafi atsaka ate ŋu ana rababa molecule nate ŋu atrɔ ɖe nɔnɔmewo ŋu nyuie wu
Woate ŋu ana atike la ƒe dzoxɔxɔ si bɔbɔ ƒe tsitretsitsi nanyo ɖe edzi ne wotsɔ plastic de eme hafi tsakae. Thin pass treatment le atikekui la tutu vɔ megbe ate ŋu ana fillers kple compatibilizers ƒe kaka ƒe nɔnɔmewo nanyo ɖe edzi, eye wòana dzoxɔxɔ si bɔbɔ ƒe tsitretsitsi nanyo ɖe edzi. Le nyateƒe me la, zi alesi wowɔa aŋea didie la, zi nenemae Mooney ƒe rababa ƒe ʋeʋẽ dzi ɖena kpɔtɔnae. Ne wodzi rababa la ƒe Tg ɖe edzi, gake nudzɔdzɔa meɖe dzesi o, eye vovototo gã aɖeke mele Tg kple Tbri si le FKM rababa si ƒe ɣeyiɣiwo to vovo la dome o.
3 Nyataƒoƒo
(1) FKM ƒe Tg te ɖe TR10 tɔ ŋu, si ate ŋu aɖe FKM ƒe molecule kɔsɔkɔsɔ ƒe dzoxɔxɔ si bɔbɔ kple glass nɔnɔme ƒe dzoxɔxɔ afia, eye Tbri la le ʋɛ wu Tg kple TR10 tɔ.
le anyi wu Tg kple TR10.
(2) Dzoxɔxɔ si bɔbɔ ƒe embrittlement nɔnɔme si le peroxide sulfurized high fluorine FKM ŋu nyo wu, eye dzoxɔxɔ si bɔbɔ ƒe embrittlement nɔnɔme si le bisphenol binary sulfurized FKM me la vɔ̃ɖi wu.
(3) FKM rababa si yɔ fũ kple carbon black N774 la te ŋu nɔa te ɖe dzoxɔxɔ si bɔbɔ nu nyuie wu; rababa si me wotsɔa nu sue aɖe ƒoa nui la me gel sɔ gbɔ wu eye wòte ŋu nɔa te ɖe dzoxɔxɔ si bɔbɔ nu nyuie wu.
(4) Ɣeyiɣi siwo wotsɔ trɔa asi le nu ŋu ƒe xexlẽme mekpɔa ŋusẽ boo aɖeke ɖe FKM-nuawo ƒe dzoxɔxɔ si mebɔ o ƒe gbagbã ƒe nɔnɔme dzi o.
