Vim li cas thiaj xaiv PTFE rau Foob?

PTFE foobthiab sealing kev daws teeb meem yog siv nyob rau hauv ntau cov kev lag luam sealing xws li pneumatics thiab hydraulics nrog rau hauv aerospace, zog, roj thiab roj, lub neej sciences sector thiab nyob rau hauv lub tshav pob ntawm lub zog tauj dua tshiab.

Cov yam ntxwv ntawm PTFESeals ua los ntawm PTFE (Polytetrafluoroethylene) yog siv nyob rau hauv ntau lwm yam ntaub ntawv sealing (xws li elastomers, PUR, ntaub ntaub, thiab lwm yam.) tsis ua tau raws li qhov yuav tsum tau kub ntau yam, tshuaj tiv thaiv los yog kev sib txhuam thiab hnav yuav tsum.PTFE tau pom los ntawm kev sib tsoo hauv 1938 los ntawm Dr. Roy J. Plunkett ntawm Du Pont's Jackson Laboratory hauv New Jersey, Tebchaws Asmeskas.Thaum tshawb xyuas cov pa roj muaj feem xyuam nrog cov fluorinated refrigerants, nws pom tias ib qho piv txwv sab laug thaum hmo ntuj nyob rau hauv lub tog raj kheej cia siab tau polymerised spontaneously mus rau ib tug dawb, waxy khoom.Cov khoom no tau ua pov thawj tias muaj qhov sib txawv tshwj xeeb nrog cov khoom zoo kawg.Lub molecularstructure ntawm PTFE yog raws li ib tug linear saw ntawm carbon atoms uas yog kiag li surrounded los ntawm fluorine atoms.Cov carbon-fluorine bonds yog cov muaj zog tshaj plaws nyob rau hauv cov organic tebchaw.

• Thermal stability nyob rau hauv ib tug dav kub ntau yam: PTFE lub siab melting point (342 ° C) thiab cov yam ntxwv morphological tso cai rau cov khoom ua los ntawm cov resin siv tsis tu ncua ntawm kev pabcuam kub txog 260 ° C.Tshaj qhov ntsuas kub no, cov khoom siv lub cev yuav txo qis, ua rau kub-aging thiab cov khoom degradation.PTFE yog siv rau ntawm qhov kub thiab txias txias los kaw cov xov xwm tseem ceeb xws li kua nitrogen (-196 ° C), kua hydrogen (-253 ° C) thiab kua helium (-269 ° C).PTFE muaj lub peev xwm tshwj xeeb los tiv thaiv cov khoom degrada-tion, tshav kub-aging thiab hloov pauv hauv lub cev lub zog thaum lub caij kub.
• Tsawg kev sib txhuam / qhuav khiav muaj peev xwm: PTFE muaj qhov sib txhuam coefficient qis tshaj plaws ntawm cov khoom paub.Nws muaj peev xwm ua rau nws tus kheej lubricating, muab kev ua haujlwm qhuav tas li hauv cov ntawv thov sealing dynamic.
• Cov tshuaj tiv thaiv tsis zoo: Intra polymer saw bonds muaj zog ntawm PTFE preclude cov tshuaj tiv thaiv nrog feem ntau cov tshuaj, yog li ua rau lawv chemically inert nyob rau hauv siab kub thiab pressures nrog zoo tag nrho cov muaj chemicals thiab cov kuab tshuaj.Tsuas yog ob peb lub xov xwm paub tias ua rau PTFE: alkali hlau, fluorine thiab ob peb fluoro-chemicals xws li chlorine tri-fluoride thiab oxygen difluoride.PTFE yog tsim rau kev sib cuag nrog zaub mov thiab txaus siab rau FDA cov cai.

Nws yog qhov tseeb tias los ntawm qhov kev sib khi ntawm qhov pom, cov yam ntxwv tshwj xeeb no muab PTFE lub peev xwm tshaj li cov khoom siv elastomeric sealing.Lwm cov khoom zoo yog:

• Txo cov nplaum nplaum
• Unlimited txee lub neej: PTFE tsis muaj hnub nyoog dhau sijhawm thiab tsis cuam tshuam los ntawm lub teeb ultraviolet.
• Tsis muaj explosive decompression: PTFE tsis cuam tshuam rau saturation ntawm high-pressure gas uas yuav nthuav dav hnyav thiab ua rau tawg ntawm cov khoom thaum lub siab yog dheev tshem tawm.
• Tsis o vim kev nqus noo noo.
• Muaj kev nyab xeeb rau siv hauv lub tshuab nqus tsev.
• Cov khoom hluav taws xob zoo heev: High dielectric zog, tsis tshua muaj dielectric tas li thiab hluav taws xob siab heev.