Polytetrafluoroethylene (PTFE) tau siv dav hauv kev lag luam tshuaj lom neeg thiab roj av vim nws cov kev tiv thaiv zoo heev rau cov av qis thiab qis, tshuaj lom neeg ruaj khov, hluav taws xob rwb thaiv tsev zoo, tsis muaj adhesion, huab cua tsis kam, nplaim hluav taws kub thiab zoo nws tus kheej-lubricating zog. , textile, hluav taws xob thiab hluav taws xob, kev kho mob, tshuab thiab lwm yam kev lag luam tau siv dav.
Ntawm cov fluoroplastics, polytetrafluoroethylene (PTFE) yog cov khoom siv dav tshaj plaws thiab siv dav, thiab yog ib qho tseem ceeb ntawm cov fluoroplastics. PTFE muaj zoo heev thiab tsis kub tsis kam thiab tshuaj stability, zoo hluav taws xob rwb thaiv tsev zog, tsis-adhesiveness, huab cua kuj, nplaim retardancy thiab zoo nws tus kheej-lubricating zog. Nws yog lub npe hu ua "King of Plastics". Cov khoom siv no tau tsim thawj zaug rau kev tiv thaiv hauv tebchaws thiab kev siv tshuab thev naus laus zis, thiab tom qab ntawd maj mam txuas mus rau kev siv pej xeem. Nws txoj kev siv koom nrog ntau yam ntawm aerospace thiab kev siv pej xeem, thiab nws tau dhau los ua cov khoom siv tsis tseem ceeb hauv nws daim ntawv thov.
Kev ua tau zoo ntawm PTEE
PTFE yog ib qho polymerized los ntawm tetrafluoroethylene monomer. Nws yog pob tshab lossis opaque ciab zoo ib yam li PE. Nws qhov ceev yog 2.2g / cm3 thiab nws qhov nqus dej tsawg dua 0 01%. Nws cov qauv tshuaj thiab cov kev txwv Zoo sib xws, tshwj tsis yog tias tag nrho cov hydrogen atoms hauv polyethylene hloov los ntawm fluorine atoms. Vim lub zog siab thiab ruaj khov ntawm CF daim ntawv cog lus, nws muaj cov tshuaj tiv thaiv corrosion zoo heev thiab tuaj yeem tiv taus tag nrho cov acids muaj zog (xws li cov dej qhuav), nrog rau cov oxidants muaj zog, txo cov neeg ua haujlwm thiab ntau yam khoom siv da dej: F atom hauv PTFE molecule yog symmetrical, ob lub ntsiab nyob rau hauv C daim ntawv cog lus yog covalently bonded, thiab tsis muaj dawb electrons nyob rau hauv lub molecule, ua rau tag nrho cov molecule nruab nrab. cov cuab yeej, yog li nws muaj cov khoom zoo dielectric, thiab nws cov hluav taws xob rwb thaiv tsev tsis cuam tshuam los ntawm ib puag ncig thiab zaus. Nws qhov ntim tsis kam yog ntau dua 1017 kilograms, tsis tshua muaj dielectric poob, siab tawg voltage, zoo arc tsis kam, thiab tuaj yeem ua haujlwm hauv ib puag ncig hluav taws xob ntawm 250 degree ntev; vim tias tsis muaj hydrogen bonds nyob rau hauv PTFE molecular qauv, cov qauv yog symmetrical, yog li nws cov crystallinity yog siab heev (lub crystallinity yog 55% mus rau 75%, tej zaum yuav siab li 949), uas ua rau PTFE tsis tshua muaj kub-resistant. Nws melting kub yog 324 degree, nws decomposition kub yog 415 degree, thiab nws siab tshaj plaws siv mixing degree yog 250 degree. Nws yog nkig. Lub melting kub yog -190 degree, qhov kub distortion kub (nyob rau hauv cov xwm txheej ntawm 0.46WPa) yog 120 degree, txhua yam khoom ntawm PTFE yog zoo, nws tensile zog yog 2128MPa, lub zog dabtsi yog khoov yog I14NPa, lub elongation ib nrab yog 250s300%, thiab dynamic thiab zoo li qub kev sib txhuam ntawm cov hlau Cov coefficients yog ob qho tib si 0.04, uas yog me dua cov kev sib txhuam coefficients ntawm nylon, polyacetal, thiab polyester plastics.
Pure PTFE muaj lub zog tsawg, hnav tsis zoo thiab tsis zoo deformation kuj. Nws yog feem ntau yuav tsum tau ntxiv ib co inorganic hais rau PTFE polymer, xws li graphite, disulfide, sulfide, corrugated fiber, carbon fiber, thiab lwm yam. los txhim kho nws cov khoom siv kho tshuab: Nws kuj tuaj yeem sib xyaw nrog lwm cov polymers xws li polyphenyl ester (HIB). ), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyperfluoro (ethylene / propylene) copolymer (PFEP), thiab lwm yam. nthuav nws qhov kub thiab txias ntau yam thiab txhim kho nws cov creep kuj.
PTFE siv
Cov khoom tshwj xeeb ntawm PTFE ua rau nws siv dav hauv kev lag luam thiab kev lag luam marine xws li kev lag luam tshuaj, pob zeb uranium, textile, zaub mov, papermaking, tshuaj, electronics thiab machinery.