Txheej txheem cej luam:
FKM los yog fluoroelastomers yog ib chav kawm ntawm elastomers uas muaj kev tiv thaiv rau ntau yam tshuaj thiab ua haujlwm kub zoo heev. Cov hom tshwj xeeb uas muaj cov monomer sib txawv thiab cov ntsiab lus fluorine yog tsim los rau cov dej ua haujlwm zoo dua, kev ua haujlwm siab thiab kub, thiab kev sib xyaw ua ke.
Nta:
▲ Kev ntsuas kub zoo heev
▲ Huab cua zoo, kev laus thiab oxygen stability
▲ Muaj tshuaj lom neeg ruaj khov
▲ Kev ua haujlwm zoo heev hauv cov roj ntxhia thiab cov rog
▲ Kev tiv thaiv zoo heev hauv cov xov xwm tsis muaj polar
▲ Kub ntau ntawm -55 degree rau ntxiv 250 degree
▲ Tsawg roj permeability
FPM yog cov ntawv luv thoob ntiaj teb raws li DIN / ISO, thiab FKM yog cov ntawv luv rau fluororubber qeb raws li Asmeskas tus qauv ASTM. Viton® yog ib lub npe lag luam ntawm Chemours, Tecnoflon® yog ib lub cim lag luam ntawm Solvay Specialty Polymers, Dyneon ™ yog ib lub npe lag luam ntawm 3M Dyneon, thiab DAI-EL ™ yog lub npe lag luam ntawm polymers muab los ntawm Daikin.
Chemical Resistance thiab Stability:
Cov tshuaj tiv thaiv thiab kub ruaj khov yog vim muaj cov fluorine atoms loj heev, uas tiv thaiv cov pob txha polymer thiab carbon-fluorine bonds los ntawm kev tawm tsam, thiab lub zog siab ntawm cov carbon-fluorine bonds, raws li qhia hauv daim duab hauv qab no.
Daim duab 1. Bonding zog (kJ/mol)
Daim duab 2. Bindungsenergie (kJ/mol)
FKM feem ntau tuaj yeem siv rau lub sijhawm ntev ntawm qhov kub txog li 200 degree. Nyob rau hauv tsheb specifications, ib tug kev pab lub neej ntawm tsawg kawg yog 5000 teev yog feem ntau txhais.
FKM monomer:
Txhawm rau ua kom pom tus cwj pwm elastic, cov polymers yuav tsum hloov pauv thiab muaj peev xwm rov qab los ntawm qhov tseem ceeb deformation. Qhov no yuav tsum tau cov polymer kom muaj txiaj ntsig zoo amorphous. Feem ntau cov polymers yog crosslinked los tsim ib lub network peb-dimensional. Lub zog tsav rau deformation rov qab yog qhov nyiam ntawm cov ntu ntu kom rov qab mus rau lub xeev tsis zoo. Feem ntau, fluorocarbon chains yog cov tawv tawv piv rau hydrocarbons thiab yog li nthuav tawm qeeb qeeb thiab rov qab los ntawm kev lim dej. Fluoroelastomers yog tsim los ntawm ob lossis ntau qhov sib txawv monomer units. Chains nrog monomers xws li VF2 (los yog VDF), TFE thiab ethylene zoo li crystallize yog tias ntev txaus. Yog li ntawd, cov monomers uas muaj cov pendant loj xws li HFP, PMVE thiab propylene tau koom ua ke los tsim cov amorphous polymers. Daim duab 3 qhia txog feem ntau siv monomers.