Polytetrafluoroethylene ndi fluoropolymer yopanga ya tetrafluoroethylene yomwe ili ndi ntchito zambiri.Dzina lodziwika bwino la PTFE-based formulas ndi polima ndi Chemours.Malo osungunuka: 620.3°F (326.8°C);Mpangidwe: (C2F4)n;Kuchulukana: 2.2 g/cm³;IUPAC ID: poly(1,1,2,2-tetrafluoroethylene).
PTFE amapangidwa ndi free-radical polymerization limagwirira mu amadzimadzi TV kudzera kuwonjezera polymerization wa TFE mu ndondomeko mtanda.Woyambitsa polima nthawi zambiri amakhala ndi peroxide yosungunuka m'madzi monga ammonium sulfate kapena disuccinic peroxide.Chothandizira cha redox chimagwiritsidwa ntchito polima polima.PTFE amapangidwa ndi kuyimitsidwa (kapena slurry) polymerization popanda surfactant kupeza utomoni granular kapena perfluorinated surfactant (emulsion polymerization) monga ammonium perfluorooctanoate kupanga ufa wabwino ndi kubalalika mankhwala.Kutentha kwa ma polymerization ndi kuthamanga nthawi zambiri kumayambira 0 mpaka 100 C ndi 0,7 mpaka 3.5 MPa.
Granular PTFE imapangidwa ndi polymerizing TFE yokha kapena kugwiritsa ntchito kuchuluka kwa ma comonomers.Choyambitsa peroxide, chowonjezera pang'ono kapena osapezekapo, ndi zowonjezera zina zitha kupezeka munjira yamadzi yopolima yomwe imakondoledwa mwamphamvu ndipo nthawi zina imatetezedwa ndi madzi amchere.Ambiri a polima aumbike mu mpweya gawo mu mawonekedwe a zingwe ndi irregularly zooneka particles.Tinthu tating'onoting'ono tating'onoting'ono tating'onoting'ono tomwe timapanga timapanga tosiyanasiyana.Mwachitsanzo, yosalala pamwamba mbali amafuna ang'onoang'ono tinthu kukula pamene bwino otaya ndi bwino ndi zazikulu tinthu kukula.
Fine ufa PTFE amapangidwa ndi polymerization wa TFE mu sing'anga amadzimadzi pamaso pa initiator ndi surfactant.The polymerization satsatira ochiritsira emulsion limagwirira koma mfundo zina zimene zimagwira ntchito.Kukhazikika kwa kubalalitsidwa pa polymerization, kupewa msanga coagulation, ndi bwino ndi kufunika kuswa emulsion kuti achire PTFE.Kutsika kwa kukameta ubweya wa ubweya kumasungidwa panthawi ya polymerization pogwiritsa ntchito milingo ya surfactant yomwe ili pansi pa ndende yovuta ya micelle.Mlingo wa polymerization ndi tinthu mawonekedwe ndi kukula amakhudzidwa ndi ndende ya surfactant.Ambiri a particles amapangidwa kumayambiriro kwa polymerization ndipo amakula pamene mkombero ukupitirira.Molecular kulemera ndi zikuchokera mu tinthu akhoza lizilamulira ntchito polymerization zosakaniza ndi zinthu.
Momwemonso ma polymerization amapangitsa dispersions amadzimadzi a PTFE ngati ufa wabwino.Kubalalika kumakhazikika ndikukhazikika pogwiritsa ntchito mitundu yosiyanasiyana ya ma ionic ndi nonionic surfactants.Njira zingapo zolimbikitsira zanenedwa kuphatikiza ma electrodecantation, evaporation, ndi kuchuluka kwamafuta.Zowonjezera mankhwala kuti zifanane ndi njira yopangira kapena gawo lazofunikira za katundu zitha kusintha kubalalitsidwa komaliza kwa PTFE.
Mankhwala odzazidwa amapangidwa kuchokera ku mitundu yonse itatu ya PTFE pogwiritsa ntchito zodzaza monga galasi fiber, graphite, ufa wachitsulo, carbon fiber, ndi ena.
Nthawi yotumiza: Sep-24-2018