Phoso e ikhethang ea fluoroelastomer (FKM) ke ho hanyetsa mocheso o tlase. Mocheso o fokolang oa mocheso o fokolang (TR10) oa binary FKM hangata ke -18 ho -16 ℃, 'me mocheso oa phetoho ea khalase (Tg) ke -20 ℃; khanyetso ea mocheso o tlase oa ternary FKM e futsanehile ho feta ea binary FKM. Mofuta o khethehileng oa mocheso o tlase oa FKM o na le khanyetso e ntle ea mocheso o tlase, empa theko e holimo haholo.
FKM ho ASTM D 2000-2012 'lihlahisoa tsa likoloi tsa rabara tse tloaelehileng' tsa lihlahisoa tsa M2, M5, M6 tse hlokehang ho feta tlhahlobo ea mocheso o tlase oa mocheso oa F15 (-25 ℃), lihlahisoa tsa M4 tse hlokahalang ho feta teko ea mocheso o tlase oa mocheso oa F17 ℃ (-40). Lilemong tsa morao tjena, lihlahisoa tse ngata tsa FKM li hlokoa ho finyella litlhoko tsa mocheso o phahameng oa ho hanyetsa (250-275 ℃) le mocheso o tlase oa mocheso oa F15 kapa F17. Tsela e molemohali ke ho sebelisa FKM ea mocheso o tlase, joalo ka mocheso oa brittleness oa -45 ~ -40 ℃ Viton GLT mofuta oa FKM, empa ts'ebetso ena ea mocheso o phahameng oa FKM e fokola 'me theko e thata ho etsa hore mmaraka o amohelehe. Ka ho ntlafatsa ts'ebetso ea lik'hemik'hale tsa binary FKM ka nako e le 'ngoe e ka finyella litlhoko tsa ho hanyetsa mocheso o tlase le o phahameng,' me theko e boetse e utloahala, e fetohile sebaka se chesang sa lipatlisiso.
Pampiri ena e hlahloba sebopeho sa ts'ebetso ea FKM ea mocheso o tlase oa Tg, TR10 le mocheso oa brittleness (Tbri) oa kamano pakeng tsa liithuti tsa morao-rao, li-fillers, mokhoa oa ho kopanya, joalo-joalo holim'a binary le ternary FKM sekhomaretsi sa mocheso o tlaase oa mocheso oa mocheso oa mocheso o tlaase bakeng sa ho lokisoa ha FKM e hanyetsanang le mocheso o tlaase ho fana ka sekhomaretsi sa FKM!
1. Sebopeho sa thepa ea FKM ea mocheso o tlase oa mocheso
Rubber e na le deformation e fetohang, e ka hlahisa phetoho e kholo tlas'a ketso ea matla a manyenyane a ka ntle, 'me e ka khutlisetsoa boemong ba eona ba pele ka mor'a ho tlosa matla a ka ntle, kahoo e sebelisoa haholo. Leha ho le joalo, ha mocheso o fokotseha, elasticity ea rabara e ntse e senyeha butle-butle, 'me ha e fihla Tg, rabara e lahleheloa ke elasticity' me e hlōleha. Ka lebaka la mefuta e fapaneng ea lihlahisoa tsa rabara, ts'ebetsong ea ts'ebeliso e ka ba le tšusumetso, tsitsipano, ho kuta, torsion, extrusion, abrasion, joalo-joalo, ts'ebetso ea eona ea mocheso o tlase oa mocheso e lokela ho ipapisa le boemo ba eona ba ho sebetsa ho khetha mokhoa o nepahetseng oa tlhahlobo. Mekhoa e tloaelehileng ea tlhahlobo ea ts'ebetso ea mocheso o tlase e kenyelletsa tlhahlobo ea Tg, tlhahlobo ea mocheso oa brittleness, teko ea ho khutlisa mocheso o tlase, tlhahlobo ea mocheso o tlase oa mocheso o tlase (teko ea Gimen), ho hanyetsa ho otlolla le teko e matla ea ho bata, teko ea boima ba mocheso o tlase, khatello e tlase ea mocheso le teko ea ho phomola, jj.
Ho hanyetsa mocheso o tlase oa FKM ho ka khetholloa ke Tg, Tbri, TR10 le Torsion Temperature ka mocheso o tlaase (TGem), joalo-joalo Mekhahlelo ena e na le litlhaloso tse fapaneng empa e na le kamano e itseng le e mong.
(1) Tg ke thempereichara eo rabara e fetohang ho eona ho tloha boemong bo tetemang haholo ho ea boemong ba khalase le boemo ba khalase ho ea boemong bo tetemang haholo, boo hangata bo khethollang motsamao o monyane oa liketane tsa limolek'hule tsa rabara.
(2) Tbri ke mocheso oo ho oona ho se nang tšenyo e hlahang ho rabara tlas'a maemo a boletsoeng a ts'ebetso ea matla a ts'oaetso, e atisang ho bonahatsa matla a rabara bakeng sa ho sebelisoa mocheso o tlaase le bokhoni ba eona ba ho mamella tšenyo.
(3) TR10 e sebelisetsoa ho lekola phello ea viscoelasticity le crystallization ea rabara ka mocheso o tlase, 'me hangata e bonahatsa mocheso o tlaase ka ho fetisisa oo thepa ea rabara e ka bolokang ho hlaphoheloa ha eona.
(4) TGem e sebelisa terata ea tšepe ea torsional e nang le torsional constant e tsejoang e le lisebelisoa tsa boitsebiso ho sotha mohlala ka lehlakoreng le leholo, ha mocheso o ntse o fokotseha, modulus ea rabara e ntse e eketseha, ho tiea hoa eketseha, 'me angle ea torsion e fokotseha ho fihlela moo e sa sothang ho Tg. The torsion angle ea rabara ho latela phetoho ea mocheso e ka lekola ts'ebetso ea eona ea mocheso o tlase, hangata e bonts'a mocheso o tlase haholo oo rabara e bolokang elasticity ea eona.
2 FKM Tg, TR10 le kamano pakeng tsa Tbri
Ka tloaelo ho sebelisoa FKM maemo a tlaase a mocheso oa mocheso ke Tg, TR10 le Tbri, hangata mofani oa thepa o amohela parameter Tg le TR10, ASTM e amohela parameter Tbri, ho na le phapang e itseng le likamano pakeng tsa tsena tse tharo.
2. 1 Kamano pakeng tsa Tg le TR10
TR10 ea sehlopha ka seng sa FKM e haufi le Tg (phapang ha e fete 3 ℃), e bonts'a hore Tg le TR10 ka bobeli li ka bonts'a motsamao o tlase oa mocheso le mocheso oa boemo ba khalase oa ketane ea molek'hule ea rabara.
2.2 Kamano lipakeng tsa litaba tsa FKM fluorine le thepa ea ebrittlement ea mocheso o tlase
Ho FKM e tloaelehileng ea binary le ternary, TR10 e eketseha ka keketseho ea litaba tsa fluorine; ha monomer ea bone, PMVE, e hlahisoa, litaba tsa eona li na le tšusumetso e kholo ho TR10.
Litaba tsa eona li na le tšusumetso e kholo ho TR10. Le hoja ho eketseha ha lintho tsa fluorine ho ka ntlafatsa moeli o ka holimo oa mocheso oa tšebeliso ea FKM, empa ka nako e ts'oanang, ka lebaka la tlamo ea CF e nkela sebaka sa CH bond, ho fokotsa bonolo ba ketane ea limolek'hule le ts'ebetso e tlaase ea mocheso oa rabara.
2.3 Tšusumetso ea li-filler ho thepa ea mocheso o tlase oa metsoako ea FKM
Sekhomaretsi sa carbon N774 se na le Tbri e tlaase ka ho fetisisa le ho hanyetsa mocheso o tlaase ka ho fetisisa; zinc oxide adhesive e na le Tbri e phahameng ka ho fetisisa le ho hanyetsa mocheso o tlaase ka ho fetisisa; tshebetso e tlaase ea mocheso o fokolang oa mefuta e mehlano ea li-adhesives ha e fapane haholo. Kamora ho hlahlobisisa, kamora ho kenyelletsa li-filler tse fapaneng, lekhalo le sebopeho lipakeng tsa liketane tsa limolek'hule tsa FKM li fapane, mme ts'ebetso e lumellanang ea mocheso o tlase oa mocheso o fapane.
Ka mor'a ho hlahlobisisa, ka mor'a ho eketsa li-fillers tse fapaneng, likheo le mehaho e pakeng tsa liketane tsa limolek'hule tsa FKM li fapane, 'me thepa e lumellanang le mocheso o tlaase oa mocheso o fapane,' me setlatsi se nang le rabara e nyenyane se na le li-gel tse kholoanyane le ho hanyetsa mocheso o tlaase.
2.4 Phello ea ts'ebetso ea ho kopanya ho thepa e fokolang ea mocheso o tlase oa metsoako ea FKM
Ts'ebetso ea ho kopanya e boetse e na le phello ho thepa e fokolang ea mocheso o tlase oa metsoako ea FKM. Ho etsa polasetiki pele ho kopanya ho ka etsa hore molek'hule ea rabara e be bonolo haholoanyane
Ho hanyetsa mocheso o tlaase oa motsoako o ka ntlafatsoa ka ho etsa polasetiki pele ho kopanya. Kalafo ea 'thin pass' ka mor'a hore motsoako o emisoe o ka ntlafatsa thepa ea ho hasana ea li-fillers le li-compatibilizers, 'me oa ntlafatsa ho hanyetsa mocheso o tlase. Ha re bua ka kakaretso, ha nako e ntse e bōptjoa, e theola viscosity ea Mooney ea rabara. Ho eketsa nako ea ho bōptjoa ho tla fokotsa Tg ea rabara, empa ketsahalo ena ha e bohlokoa, 'me ha ho na phapang e khōlō pakeng tsa Tg le Tbri ea rabara ea FKM e nang le linako tse fapaneng tsa ho bōptjoa.
3 Qetello
(1) Tg ea FKM e haufi le ea TR10, e ka bontšang mocheso o tlase oa mocheso oa ketane ea molek'hule ea FKM le mocheso oa boemo ba khalase, 'me Tbri e tlase ho feta ea Tg le TR10.
e ka tlase ho Tg le TR10.
(2) Thepa e tlaase mocheso embrittlement thepa peroxide sulphurized phahameng fluorine FKM molemo, le tlaase mocheso embrittlement thepa ea bisphenol binary sulfurized FKM hobe le ho feta.
(3) rabara ea FKM e tlatsitsoeng ka carbon black N774 e na le khanyetso e ntle ea mocheso o tlaase; rabara e nang le palo e nyane ea li-filler e na le li-gel tse ngata le ho hanyetsa mocheso o tlase.
(4) Palo ea linako tsa ho bōptjoa ha e na phello e fokolang ho thepa ea mocheso o tlase oa mocheso oa metsoako ea FKM.
