Ngaphezulu kweminyaka engamashumi amathandathu iPolytetrafluoroethylene (PTFE, amagama ebrand: Tarflen, polymer, Fluon) yaziwa kwaye yamkelwa ngeempawu zayo ezizodwa.Isetyenziswa ngokubanzi kuwo onke amasebe oshishino, kuquka imveliso bhetyebhetyeimibhobhoyolwakhiwo olwahlukeneyo kunye nokusetyenziswa.
Iimpawu ezizodwa ze-PTFE:
- Ukumelana neekhemikhali ezigqwesileyo.Ayinyibiliki okanye idumbe nakwesiphi na isinyibilikisi esaziwayo.Iyakwazi ukumelana neeasidi ezinobundlobongela kunye neziseko.Zimbalwa kakhulu, izinto ezinqabileyo kakhulu (i-fluorine, isinyithi esibilisayo se-alkali, i-oxygen bifluoride, i-chlorine trifluoride) inokuchaphazela i-PTFE.- Uluhlu olubanzi lokumelana ne-thermal.I-PTFE ihlala ibhetyebhetye nakwiqondo lobushushu le-helium engamanzi (-269°C)Ubushushu bokusebenza kwimibhobho eyenziwe nge-PTFE ngokuqhelekileyo buqala ukusuka -70 ° C ukuya +260 ° C ngokuxhomekeke kuyilo lombhobho (uxinzelelo kunye neeparamitha zoomatshini zePTFE ziqala ukuhla xa ubushushu buphakama ngaphezu kwe +130 ° C) .- Ukumelana nokuguga. kunye neemeko zemozulu.I-PTFE yi-hydrophobic, imelana ngokupheleleyo ne-ozone, ioksijini, ukukhanya kunye nemitha ye-UV.Iisampuli ezivezwe iminyaka emininzi kwiimeko zemozulu ezahlukeneyo azizange zibonise naluphi na utshintsho kwiipropati ze-PTFE.- I-PTFE ine-coefficient ephantsi kakhulu ye-friction (ukusuka kwi-0.02 ukuya kwi-0.2) kunye nexabiso eliphantsi lamandla angaphezulu.Ngoko ke i-hoses ezenziwe nge-PTFE zinezixhobo zokuzicoca (izinto azibambeli kwiindonga ze-hose) ngoko ke ukuhanjiswa kucocekile kakhulu.- Iimpawu zombane ezilungileyo, i-resistivity ephezulu.
Ezinye izixhobo ezifana ne-PTFE
Imibhobho ingenziwa kuphela kwi-PTFE kodwa nakwi-PTFE copolymers.Zihlala zinemichiza ephezulu kunye nokumelana nobushushu kodwa ezinye iipropathi zahluke kancinane xa kuthelekiswa ne-PTFE (ukumelana ngcono koomatshini, iimpawu zokusetyenzwa ngcono):
- FEP (ipolymer FEP, DuPont),- PFA, MFA (polymer PFA, DuPont),- ETFE (Tefzel, DuPont),- ECTFE (Halar).
Ukuveliswa kunye nokwakhiwa kwee-PTFE hoses
Ngenxa ye-viscosity ephezulu nakumaqondo obushushu akufutshane nokubola kwe-thermal (+415 ° C),Imibhobho ye-PTFEzenziwa ngokukhupha i-compound ye-lubricant (ioli yeparafini) kunye ne-PTFE powder.
Iindidi zolwakhiwo lombhobho we-PTFE:
- Imibhobho egudileyo kunye namacangci angenawo umluko.Isetyenziselwa izicelo zoxinzelelo oluphantsi.I-Translucent, udonga lwe-PTFE luvumela ulawulo olubonakalayo lokuhamba.- Imibhobho egudileyo ene-braid enye okanye kabini yangaphandle eyenziwe ngensimbi engenasici.Isetyenziswa ngokubanzi phantse kuwo onke amajelo eendaba: iikhemikhali, iigesi, umphunga, ioyile, izinto zokuthambisa, amafutha, ipeyinti, izinto zokuncamathelisa, ukutya kuwo onke amasebe oshishino.Ukudityaniswa koxinzelelo oluphezulu olusebenzayo lwemibhobho (ukuya kuthi ga kwi-400 bar) kunye ne-PTFE iipropathi ezikhethekileyo zikhokelela kwisisombululo sendalo yonke kunye nesingenakuthatyathelwa indawo kubugcisa bemizi-mveliso yamva nje.Ngamanye amaxesha uqiniswa nge-helix yentsimbi yensimbi phakathi kwe-PTFE kunye ne-braid yangaphandle.Yenziwe kwiinketho ezahlukeneyo zokwakha kunye noxinzelelo oluphantsi lokusebenza kodwa ukuguquguquka okuphezulu kunemibhobho ye-bore egudileyo.- I-hoses ye-bore e-smooth kunye ne-PTFE ekhutshiweyo kunye ne-textile braid, i-helix yensimbi yokuqinisa kunye nomgangatho wangaphandle owenziwe ngerabha.Zonke iileya zihlanjululwe kwaye zidibaniswe ngokusisigxina kunye ne-PTFE yangaphakathi-njenge-hose yerabha eqhelekileyo.Isetyenziswa ikakhulu kwishishini lemichiza.
Ixesha lokuthumela: Jun-02-2018