Polytetrafluoroethylene (polytetrafluoroethylene) yog tej zaum qhov siv ntau tshaj plaws fluoropolymer vim nws muaj ob peb yam ntxwv uas ua rau nws zoo tagnrho cov khoom siv rau ntau yam kev siv.Nws yog qhov hloov tau yooj yim dua li lwm cov kav dej zoo sib xws thiab tuaj yeem tiv taus yuav luag txhua yam khoom siv tshuaj
Qhov ntsuas kub yog kwv yees li -330 ° F txog 500 ° F, muab qhov dav tshaj qhov kub ntawm cov fluoropolymer.Tsis tas li ntawd, nws muaj cov khoom siv hluav taws xob zoo heev thiab tsis tshua muaj hlau nplaum permeability.Ptfe tubing yog qhov siv dav tshaj plaws hauv chav kuaj tubing thiab kev siv tshuaj lom neeg thiab purity yog qhov tseem ceeb.PTFEmuaj cov coefficient tsawg heev ntawm kev sib txhuam thiab yog ib qho ntawm feem ntau "slip" tshuaj paub
Nta:
100% ntshiab PTFE cob
Piv nrog FEP, PFA, HP PFA, UHP PFA, ETFE, ECTFE, feem ntau hloov tau fluoropolymer kav
Chemically inert, resistant rau yuav luag tag nrho cov kev lag luam tshuaj thiab cov kuab tshuaj
Dav qhov kub thiab txias
Tsawg nkag mus
Smooth non-stick txheej tiav
Tsawg tshaj kev sib txhuam coefficient
Kev ua haujlwm hluav taws xob zoo heev
Tsis-flammable
Tsis muaj tshuaj lom
Daim ntawv thov:
chav kuaj
Cov txheej txheem tshuaj
Kev soj ntsuam thiab txheej txheem cov cuab yeej
Kev soj ntsuam emission
Tsawg kub
kub kub
Hluav taws xob
ozone
Cov qauv ntawm PTFE molecules
Polytetrafluoroethylene (PTFE) yog tsim los ntawm polymerization ntawm ntau tetrafluoroethylene molecules
Daim duab PTFE yooj yim no tsis qhia cov qauv peb-dimensional ntawm lub molecule.Nyob rau hauv qhov yooj yim molecular poly (ethylene), cov pa roj carbon caj qaum ntawm lub molecule yog txuas nrog hydrogen atoms nkaus xwb, thiab cov saw no hloov tau yooj yim heev - nws yog twv yuav raug hu tsis yog linear molecule.
Txawm li cas los xij, hauv polytetrafluoroethylene, fluorine atom hauv pawg CF2 yog qhov loj txaus los cuam tshuam nrog cov fluorine atom ntawm pawg nyob ib sab.Koj yuav tsum nco ntsoov tias txhua fluorine atom muaj 3 khub ntawm ib leeg electrons tawm
Cov txiaj ntsig ntawm qhov no yog txhawm rau txhawm rau kev sib hloov ntawm cov pa roj carbon-carbon ib daim ntawv cog lus.Cov fluorine atoms zoo li yuav tsum tau npaj kom deb li deb tau ntawm cov fluorine atoms uas nyob ib sab.Kev sib hloov yuav koom nrog ib leeg-pair kev sib tsoo ntawm fluorine atoms ntawm cov pa roj carbon atoms-uas ua rau kev sib hloov tsis zoo.
Lub zog quab yuam kaw cov molecule rau hauv ib tug pas nrig, thiab cov fluorine atoms yog teem nyob rau hauv ib tug maj mam muab kauv - cov fluorine atoms yog teem nyob rau hauv ib tug kauv nyob ib ncig ntawm cov pa roj carbon qaum.Cov kab hlau lead no yuav muab sib xyaw ua ke zoo li ntev, nyias xaum rau hauv ib lub thawv
Qhov kev sib raug zoo ntawm kev sib raug zoo no muaj kev cuam tshuam tseem ceeb ntawm lub zog ntawm lub cev, raws li koj yuav pom
Intermolecular rog thiab lub melting point ntawm PTFE
Lub melting point ntawm polytetrafluoroethylene yog hais txog 327 ° C.Qhov no yog qhov siab heev rau cov polymer no, yog li yuav tsum muaj ntau lub zog ntawm van der Waals ntawm cov molecules
Vim li cas tib neeg thov cov van der Waals rog hauv PTFE tsis muaj zog?
Lub van der Waals dispersion quab yuam yog tshwm sim los ntawm ib ntus fluctuating dipoles generated thaum lub electrons nyob rau hauv lub molecule txav ib ncig.Vim hais tias PTFE molecule loj, koj yuav xav tau ib tug loj dispersion quab yuam vim muaj ntau cov electrons uas yuav txav tau.
Qhov xwm txheej dav dav yog qhov loj dua cov molecule, qhov loj dua lub zog dispersion
Txawm li cas los xij, PTFE muaj teeb meem.Fluorine yog electronegative heev.Nws zoo li khi cov electrons hauv carbon-fluorine daim ntawv cog lus kom nruj ua ke, yog li nruj kom cov electrons txav tsis tau raws li koj xav.Peb piav qhia txog carbon-fluorine daim ntawv cog lus raws li tsis muaj zog polarization
Van der Waals rog kuj suav nrog kev sib cuam tshuam dipole-dipole.Tab sis nyob rau hauv polytetrafluoroethylene (PTFE), txhua molecule yog surrounded los ntawm ib tug me ntsis tsis zoo nqi fluorine atoms.Hauv qhov no, tsuas yog kev sib cuam tshuam ntawm cov molecules yog kev sib nrig sib repulsion!
Yog li lub zog dispersion tsis muaj zog dua li qhov koj xav, thiab kev sib cuam tshuam ntawm dipole-dipole yuav ua rau muaj kev cuam tshuam.Tsis xav tias tib neeg hais tias van der Waals quab yuam hauv PTFE tsis muaj zog heev.Koj yuav tsis tau txais lub zog quab yuam, vim hais tias lub zog ntawm lub zog dispersion yog ntau dua li ntawm kev sib cuam tshuam ntawm dipole-dipole, tab sis cov txiaj ntsig zoo yog tias lub zog van der Waals yuav tsis muaj zog.
Tab sis PTFE muaj lub siab melting point, yog li lub zog uas tuav cov molecules ua ke yuav tsum muaj zog heev.
Yuav ua li cas PTFE muaj lub siab melting point?
PTFE yog crystalline heev, nyob rau hauv qhov kev txiav txim no muaj ib tug loj cheeb tsam, lub molecules nyob rau hauv ib tug heev tsis tu ncua kev npaj.Nco ntsoov, PTFE molecules tuaj yeem xav tias yog elongated rods.Cov ncej no yuav tau sib koom ua ke
Qhov no txhais tau hais tias txawm hais tias ptfe molecule tsis tuaj yeem tsim cov dipoles loj ib ntus, cov dipoles tuaj yeem siv tau zoo heev.
Yog li cas cov van der Waals rog hauv PTFE tsis muaj zog lossis muaj zog?
Kuv xav tias koj tuaj yeem yog ob qho tib si!Yog tias cov saw hlau polytetrafluoroethylene (PTFE) tau teeb tsa hauv txoj hauv kev uas tsis muaj kev sib raug zoo ntawm cov chains, lub zog ntawm lawv yuav tsis muaj zog heev thiab cov ntsiab lus melting yuav tsawg heev.
Tab sis nyob rau hauv lub ntiaj teb no tiag, molecules nyob ze.Van der Waals rog tej zaum yuav tsis muaj zog npaum li lawv muaj, tab sis cov qauv ntawm PTFE txhais tau hais tias lawv xav tias muaj txiaj ntsig zoo tshaj plaws, ua rau tag nrho cov khoom muaj zog sib txuas thiab cov ntsiab lus melting siab.
Qhov no yog qhov sib piv rau lwm lub zog, xws li lub zog dipole-dipole sib cuam tshuam, uas tsuas yog txo los ntawm 23 zaug, lossis ob zaug qhov kev ncua deb yog txo los ntawm 8 zaug.
Yog li ntawd, lub kaw ntom nti ntawm cov pas nrig-puab molecules nyob rau hauv PTFE maximizes cov hauj lwm zoo ntawm dispersion.
Cov khoom tsis-stick
Qhov no yog vim li cas dej thiab roj tsis lo rau saum npoo ntawm PTFE, thiab yog vim li cas koj tuaj yeem kib qe hauv lub lauj kaub PTFE-coated yam tsis ua rau lub lauj kaub
Koj yuav tsum xav txog dab tsi rog tuaj yeem kho lwm cov molecules ntawm qhov chawPTFE.Tej zaum nws yuav suav nrog qee yam tshuaj lom neeg, van der Waals quab yuam lossis hydrogen daim ntawv cog lus
Tshuaj sib txuas
Cov carbon-fluorine daim ntawv cog lus muaj zog heev, thiab nws tsis tuaj yeem ua rau lwm cov molecules ncav cuag cov saw hlau kom ua rau muaj kev hloov pauv hloov pauv.Nws yog tsis yooj yim sua kom muaj ib tug chemical bond tshwm sim
van der Waals rog
Peb tau pom tias lub zog ntawm van der Waals hauv PTFE tsis muaj zog heev, thiab nws tsuas yog ua rau PTFE muaj qhov kub siab melting point, vim hais tias cov molecules nyob ze heev uas lawv muaj kev sib cuag zoo heev.
Tab sis nws txawv rau lwm cov molecules ze rau saum npoo ntawm PTFE.Cov molecules me me (xws li dej molecules lossis roj molecules) tsuas yog muaj qhov sib cuag me me ntawm qhov chaw, thiab tsuas yog ib qho me me ntawm van der Waals attraction.
Ib qho loj molecule (xws li cov protein) yuav tsis zoo li tus pas nrig, yog li tsis muaj kev sib cuag zoo txaus ntawm nws thiab saum npoo kom kov yeej qhov tsis tshua muaj polarization ntawm PTFE.
Txawm li cas los xij, van der Waals quab yuam ntawm qhov chaw ntawm PTFE thiab cov khoom nyob ib puag ncig me me thiab tsis muaj txiaj ntsig
Hydrogen bonds
PTFE molecules nyob rau saum npoo yog qhwv tag nrho los ntawm fluorine atoms.Cov fluorine atoms no yog electronegative heev, yog li lawv txhua tus muaj qee qhov kev tsis zoo.Txhua fluorine kuj muaj 3 khub ntawm ib leeg electrons protruding
Cov no yog cov xwm txheej tsim nyog rau kev tsim cov ntawv cog lus hydrogen, xws li ib leeg khub ntawm fluorine thiab hydrogen atom hauv dej.Tab sis qhov no obviously yuav tsis tshwm sim, txwv tsis pub yuav muaj ib tug muaj zog attraction ntawm PTFE molecules thiab dej molecules, thiab cov dej yuav lo rau PTFE.
Cov ntsiab lus
Tsis muaj txoj hauv kev zoo rau lwm cov molecules kom ua tiav rau saum npoo ntawm PTFE, yog li nws muaj qhov tsis zoo.
Qhov kev sib txhuam qis
Lub coefficient ntawm kev sib txhuam ntawm PTFE yog tsawg heev.Qhov no txhais tau hais tias yog tias koj muaj qhov nto coated nrog ptfe, lwm yam yuav yooj yim plam ntawm nws.
Hauv qab no yog cov ntsiab lus ceev ntawm qhov tshwm sim.Qhov no yog los ntawm 1992 daim ntawv hu ua "Friction and Wear of Polytetrafluoroethylene".
Thaum pib ntawm zawv zawg, PTFE nto tawg thiab qhov loj yog hloov mus rau qhov twg nws yog zawv zawg.Qhov no txhais tau tias PTFE nto yuav hnav.
Raws li qhov zawv zawg txuas ntxiv, cov blocks nthuav tawm rau hauv cov yeeb yaj kiab nyias.
Nyob rau tib lub sijhawm, qhov saum npoo ntawm PTFE yog rub tawm los ua ib txheej txheej txheej.
Ob qhov chaw hauv kev sib cuag tam sim no muaj cov txheej txheem zoo PTFE molecules uas tuaj yeem swb ntawm ib leeg
Cov saum toj no yog kev taw qhia ntawm polytetrafluoroethylene, polytetrafluoroethylene tuaj yeem ua rau ntau yam khoom, peb tshwj xeeb hauv kev ua ptfe raj,ptfe hose manufacturers, zoo siab txais tos rau kev sib txuas lus nrog peb
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Post lub sij hawm: May-05-2021