Qhov sib txawv tseem ceeb ntawm EPDM thiab Viton yog tias EPDM muaj txiaj ntsig zoo hauv cov ntawv thov kub dua thaum Viton muaj txiaj ntsig hauv cov ntawv thov kub qis.
EPDM thiab Viton yog cov khoom siv roj hmab tseem ceeb nrog cov ntawv thov sib txawv ntawm qhov sib txawv. EPDM roj hmab yog ib hom roj hmab hluavtaws muaj txiaj ntsig hauv ntau daim ntawv thov. Viton yog ib pawg ntawm fluorocarbon-based fluoroelastomer cov ntaub ntawv uas feem ntau hu ua fluorine roj hmab lossis fluoro-rubber.
EPDM yog dab tsi?
EPDM roj hmab yog hom roj hmab hluavtaws muaj txiaj ntsig hauv ntau daim ntawv thov. Lub sij hawm EPDM sawv cev rau ethylene propylene diene monomer roj hmab. Muaj ntau hom dienes uas tuaj yeem siv los tsim cov roj hmab EPDM, xws li ethylidene norbornene, dicyclopentadiene, thiab vinyl norbornene.
Daim duab 01: Cov Qauv Zoo Tshaj Plaws ntawm EPDM Polymer
Cov khoom siv no yog cov roj hmab M-chav kawm raws li ASTM thoob ntiaj teb tus qauv D-1418. Chav kawm M no feem ntau muaj elastomers uas muaj cov saw hlau saturated ntawm hom polyethylene. Peb tuaj yeem npaj cov khoom siv roj hmab EPDM los ntawm ethylene, propylene, thiab diene co-monomer uas tuaj yeem ua kom muaj kev sib txuas ntawm cov txheej txheem sulfur vulcanization.
Zoo ib yam li lwm yam khoom siv roj hmab, EPDM kuj tseem muaj cov khoom ntim, suav nrog cov pa roj carbon dub thiab calcium carbonate, nrog rau cov yas xws li roj paraffinic. Nws muaj txiaj ntsig zoo ntawm cov khoom siv roj hmab uas tshwm sim vim kev sib txuas ntawm kev sib txuas. Ntxiv nrog rau vulcanization nrog sulfur, crosslinking kuj tuaj yeem ua tiav siv peroxides lossis phenolic resins.
Thaum xav txog cov tshuaj thiab lub cev ntawm cov khoom siv roj hmab EPDM, nws muaj qhov nyuaj ntawm 30 - 90 ntawm Shore A nplai thiab tensile tsis ua haujlwm ntawm 17 MPa. Nws qhov elongation tom qab tawg yog > 300% thiab qhov ceev yog >2.00 g / cm 3Tsis tas li ntawd, muaj qee qhov tseem ceeb thermal zog xws li cov coefficient ntawm linear thermal expansion (106 micrometers), qhov siab tshaj plaws Kev pabcuam kub yog 150 degrees Celsius, thiab iav hloov pauv kub yog -54 degrees Celsius.
Muaj cov khoom siv tseem ceeb ntawm cov khoom siv roj hmab EPDM, xws li siv nyob rau hauv qhov hnyav sab nraud vim muaj kev tiv thaiv zoo rau cov cua sov, lub teeb, thiab ozone raug, muaj txiaj ntsig zoo li hluav taws xob rwb thaiv tsev, ua lub elastomer ruaj khov, muaj txiaj ntsig los tsim huab cua., etc.
Viton yog dab tsi?
Viton yog ib pawg ntawm fluorocarbon-based fluoroelastomer cov ntaub ntawv uas feem ntau hu ua fluorine roj hmab lossis fluoro-rubber. Viton yog lub npe nrov. Cov khoom no yog txhais los ntawm ASTM International standard D1418 thiab ISO standard 1629. Txhua tus tswv cuab hauv pawg no muaj vinylidene fluoride ua monomer. Keeb kwm, cov khoom no tau tsim los ntawm DuPont, uas yog tsim los ntawm ntau lub tuam txhab sib txawv niaj hnub no.
Raws li cov tshuaj muaj pes tsawg leeg, muaj ntau hom Viton polymers hu ua hom-1, hom-2, hom-3, hom-4, thiab hom-5.
- Type-1 muaj vinylidene fluoride thiab hexafluoropropylene. Cov ntsiab lus fluorine ntawm hom no yog kwv yees li 66% qhov hnyav.
- Type-2 muaj vinylidene fluoride, hexafluoropropylene, thiab tetrafluoroethylene. Lawv muaj cov ntsiab lus fluorine ntau dua hauv lawv daim ntawv terpolymer piv rau daim ntawv copolymer.
- Type-3 muaj vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, thiab perfluoromethylvinylether. Cov ntsiab lus fluorine feem ntau yog li ntawm 62 - 38% qhov hnyav.
- Type-4 muaj propylene, tetrafluoroethylene, thiab vinylidene fluoride. Cov ntsiab lus fluorine ntawm hom no feem ntau yog kwv yees li 67% qhov hnyav.
- Type-5 muaj vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, perfluoromethylvinylether, thiab ethylene.
Cov tebchaw no muaj qhov kub thiab txias thiab ua rau muaj kuab lom thaum piv rau lwm cov elastomers. Nws tuaj yeem ua ke nrog kev ruaj ntseg zoo tshaj plaws nrog ntau hom tshuaj, xws li roj, diesel, ethanol mix, lossis kua dej hauv lub cev.
Viton muaj txiaj ntsig zoo hauv cov txheej txheem tshuaj lom neeg thiab roj av refining, tshuaj xyuas thiab txheej txheem cov cuab yeej xws li cov khoom sib cais, diaphragms, cylindrical fittings, hoops, gaskets, thiab lwm yam., semiconductor manufacturing, zaub mov, thiab kev lag luam tshuaj, kev siv dav hlau thiab dav hlau.
Qhov txawv ntawm EPDM thiab Viton yog dab tsi?
Qhov sib txawv tseem ceeb ntawm EPDM thiab Viton yog tias EPDM muaj txiaj ntsig zoo hauv cov ntawv thov kub dua thaum Viton muaj txiaj ntsig hauv cov ntawv thov kub. EPDM yog ib qho fluoroelastomer whereas Viton yog ib qho ethylene-propylene-diene-monomer.
Cov hauv qab no qhia txog qhov sib txawv ntawm EPDM thiab Viton hauv daim ntawv teev npe rau kev sib piv ntawm ib sab.
Summary – EPDM vs Viton
Muaj ntau yam siv EPDM thiab Viton roj hmab cov ntaub ntawv. Qhov sib txawv tseem ceeb ntawm EPDM thiab Viton yog tias EPDM muaj txiaj ntsig zoo hauv cov ntawv thov kub dua thaum Viton muaj txiaj ntsig hauv cov ntawv thov kub qis.
