Polytetrafluoroethylene kapena PTFE (yomwe imadziwika kwambiri kuti polima) ndi fluoropolymer yosinthika kwambiri ya minyanga ya njovu komanso yowoneka bwino;imapangidwa ndi polymerization yaulere ya mamolekyu ambiri a tetrafluoroethene, ndipo ndiyoyenera kugwiritsidwa ntchito mosiyanasiyana m'mafakitale osiyanasiyana monga mlengalenga, makampani azakudya ndi zakumwa, mankhwala ndi ma telecom.
Wopangidwa ndi AFT Fluorotec mu ndodo kapena machubu amtundu uliwonse, kapena wodzazidwa ndi galasi, kaboni, chitsulo chosapanga dzimbiri kapena zinthu zina zambiri kuti muwonjezere kukana ndi mphamvu, zilizonse zomwe polojekiti yanu kapena kumanga, tikutsimikiza kukhala ndi zinthu zomwe zingakuthandizireni. .
ZOCHITIKA ZIMAKHALA ZA PTFENgati mukuyesera kupanga zida zosinthika kwambiri, zosagwira mankhwala, zosagwira kutentha, zosagwira ndodo komanso zosagwira magetsi, ndipo sizinachitike kale, mukuyembekeza kuti mutha kupeza chinthu kwinakwake. pafupifupi monga PTFE ili m'malo awa.
PTFE a kusungunuka mfundo ndi mozungulira 327°C, ndi koyera PTFE pafupifupi kwathunthu mankhwala inert, kwambiri insoluble mu zosungunulira ambiri kapena mankhwala, ndi thermally khola moti ntchito pakati -200 madigiri C ndi +260 madigiri C popanda wonyozeka.
Zina zothandiza PTFE katundu ndi mkulu flexural mphamvu, ngakhale kutentha pang'ono, mkulu magetsi kukana ndi dielectric mphamvu, kukana madzi (chifukwa fluorine ndi mkulu electronegativity), ndi kutsika koyenerika ya kukangana.Kachulukidwe wa PTFE ndiwokwera kwambiri, pa 2200 kg/m3.
M'malo mwake, kupitilira kuchitapo kanthu ndi mankhwala ena ndi zosungunulira (mwachitsanzo, chlorine trifluoride, cobalt(III) fluoride, xenon difluoride kapena fluorine yoyambira ngati pamphamvu kwambiri komanso kutentha), chinthu chokhacho chomwe chiyenera kuganiziridwa mukamagwiritsa ntchito PTFE ndi kuti ilibe kukana bwino kwa cheza champhamvu champhamvu, chomwe chingayambitse kuwonongeka kwa molekyulu ya PTFE.
ZOCHITIKA ZA PTFE PROPERTIESIKuphatikiza pa PTFE yoyera, pali ma polima awiri omwe ali othandiza mofanana ndi PTFE, koma okhala ndi zinthu zosiyanasiyana.
PFA kapena Perfluoroalkoxy ili ndi zofanana kwambiri ndi PTFE chifukwa imakhala yosamva mankhwala, imasinthasintha komanso imakhala yosasunthika (pogwiritsa ntchito mosalekeza mpaka madigiri 260 C), koma pamene PTFE imakhala ndi chizolowezi chokwawa, PFA imalimbana ndi zokwawa ndipo ndi yabwino kwambiri. kusungunula, kuumba jekeseni, extrusion, kuponderezana kuumba, kuwomba, ndi kusamutsa akamaumba.
TFM, yomwe imadziwika kuti PTFE-TFM, ndi polytetrafluoroethylene yokhala ndi perfluoropropylvinylether ngati chosinthira chowonjezera, chopatsa zinthu zolimba zomwe ndi zolimba, komanso zolimba ngati PFA, komanso zowotcherera.KUDZAZIDWA PTFEPure kapena namwali PTFE akhoza deform zoipa pansi katundu, koma ntchito fillers angathandize ndi izi, ngakhale tisaiwale kuti si onse odzazidwa PTFE ndi oyenera ntchito ndi chakudya.
Kuwonjezera filler kwa PTFE akhoza kuwonjezera mphamvu zake, kusintha kukana abrasion, kuwonjezera madutsidwe magetsi ndi zina;komabe, kuwonjezera zodzaza kungathenso kuchepetsa zina mwazopindulitsa za PTFE, monga kukana kwa mankhwala komwe kungachepetsedwe ndi zodzaza.
Zodzaza zomwe zimagwiritsidwa ntchito zimatha kuchokera pagalasi pamaperesenti osiyanasiyana, chitsulo chosapanga dzimbiri, molybdenum disulphide, kaboni kapena graphite, kutengera zomwe ziyenera kukonzedwa.
Ubwino NDI UPHINDO WOGWIRITSA NTCHITO PTFEUbwino waukulu wa PTFE ndi kusinthasintha kwake, ndipo kuchuluka kwa ntchito pa zinthu zambiri ndi mafakitale osiyanasiyana pankhaniyi ndikodabwitsa.
Kugwiritsa ntchito PTFE kungakhale ndi phindu lalikulu pakupanga ndi uinjiniya, osati kungopanga machubu kapena ma liner kuti agwire kapena kusunga mankhwala owononga, koma popaka mbali monga mayendedwe kapena zomangira kuti awonjezere moyo wa magawo onsewo ndi makina omwe ali. gawo la.
Chophimba chokutidwa ndi PTFE sichikhala ndi dzimbiri, chifukwa cha kuthekera kwa PTFE kuthamangitsa madzi ndi mafuta, komanso kuthiridwa ndi zinthuzo kuti ziyendetse bwino pamalo aliwonse omwe mukumatira, ndikukangana kocheperako, zomwe zimapangitsa kuti pakhale kuchepera pang'ono pa screw ndi pamwamba, ndi kutha kwautali, kotetezeka kwambiri.
Kukangana ndi kuvala kungakhalenso zinthu zokhala ndi mayendedwe, ndipo chovala cha PTFE chingapereke ubwino wofanana ndi zomangira zomangira, ndi mwayi wowonjezera kuti zokutira zidzakhalanso zosagwira kutentha.
Zikuwonekeratu kuti mbali zokhalitsa, zogwira ntchito kwambiri zimatha kuwonjezera mphamvu zamakina aliwonse, kuchepetsa kufunika kopeza nthawi zonse zolowa m'malo, kupulumutsa ndalama komanso nthawi yofunikira kuti zigwirizane ndi zina, komanso kuchepetsa zinyalala.Izi zidzachepetsanso zosowa zosamalira chifukwa sizingakhale zolakwika ndi zida, komanso kuchepetsa kwambiri, kapena kuthetsa, nthawi yotsika mtengo yopangira chifukwa cha zolakwika kapena kukonza.
Kuyeretsa zida kumathanso kuchepetsedwa nthawi zina monga malaya a PTFE samanyowetsa, kumathandizira kudziyeretsa kwa magawo.
Ndipo nsalu za polima zimatha kuthandizira chilengedwe, chifukwa, zikagwiritsidwa ntchito pa nsalu, mapeto ake amachotsa madontho a madzi ndi mafuta, kuchepetsa kufunika kogwiritsa ntchito kuyeretsa kowuma, ndipo nsalu zidzaumanso mofulumira, pogwiritsa ntchito mphamvu zochepa ndi kuyanika, ndi kukhalitsa chifukwa cha kuchepa kwa kuvala.
Ndi ubwino anawonjezera kuti PTFE si poizoni, ali chabe contraindications zazing'ono kwa anthu polima fume fever (pokhapo ngati kutentha kwa poto aliyense yokutidwa ndi polima kufika madigiri 260 C) ndipo FDA ovomerezeka ndi chakudya-otetezeka, nkhaniyi kwenikweni. ndi zothandiza kwambiri m'madera ambiri.ZOCHITIKA ZOSANGALATSA ZA PTFEA komanso kupaka chirichonse kuchokera ku ziwaya kupita ku mayendedwe, PTFE imagwiritsidwanso ntchito kuletsa tizilombo kukwera makoma chifukwa zinthuzo zimakhala 'zopanda ndodo' kotero kuti tizilombo (komanso nalimata) sitingathe kugwira.Polima imagwiritsidwa ntchito kawirikawiri ngati Chophimba pa catheter kuti chilepheretse mabakiteriya ndi matenda ndipo chimagwiritsidwanso ntchito ngati kumezanitsa pa opaleshoni.
Mudzamvapo za Gore-Tex, ndipo ndi PTFE kachiwiri, nthawi ino ngati kansalu kakang'ono kakang'ono kamene kamapanga mvula yopuma mpweya, kapena zoikamo zachipatala, kutsekemera kwa mawaya ndi zosindikizira.
Pokumbukira kuti PTFE idapezeka ndi ngozi yachisangalalo mu 1938, ndizovuta kulingalira dziko lathu lero popanda.
Ngati mukufuna kugwiritsa ntchito PTFE pamapulojekiti anu aliwonse, kapena ngati mukufuna kudziwa zambiri zamtundu wa PTFE, chonde lemberani ndipo tidzakhala okondwa kukuwuzani zomwe mungasankhe.
Nthawi yotumiza: May-30-2020