Polytetrafluoroethylene ke fluoropolymer ea maiketsetso ea tetrafluoroethylene e nang le lits'ebetso tse ngata.Lebitso la lebitso le tsebahalang haholo la liforomo tse thehiloeng ho PTFE ke polymer by Chemours.Sebaka se qhibidihang: 620.3°F (326.8°C);Foromo: (C2F4)n;Boemo: 2.2 g/cm³;IUPAC ID: poly(1,1,2,2-tetrafluoroethylene).
PTFE e hlahisoa ke mochine oa polymerization oa mahala-radical ka har'a mecha ea litaba e nang le metsi ka ho eketsa polymerization ea TFE ka mokhoa oa batch.Moqapi oa polymerization hangata ke peroxide e qhibilihang ka metsi joalo ka ammonium persulfate kapa disuccinic peroxide.Sesebelisoa sa redox se sebelisoa bakeng sa polymerization ea mocheso o tlase.PTFE e hlahisoa ka ho fanyeha (kapa slurry) polymerization ntle le surfactant ho fumana li-resin tsa granular kapa ka perfluorinated surfactant (emulsion polymerization) tse kang ammonium perfluorooctanoate ho hlahisa phofo e ntle le lihlahisoa tsa ho hasana.Mocheso oa polymerization le khatello hangata li tloha ho 0 ho isa ho 100 C le 0.7 ho isa ho 3.5 MPa.
Granular PTFE e hlahisoa ka polymerizing TFE feela kapa ka ho sebelisa trace amount of comonomers.Moqapi oa peroxide, sehlahisoa se senyenyane kapa se se nang letho, le li-additives tse ling li ka 'na tsa e-ba teng ka har'a metsi a polymerization medium e tsosoang ka matla 'me ka linako tse ling e ts'oaroa ke motsoako oa alkaline.Boholo ba polymer bo thehoa karolong ea khase ka sebōpeho sa likaroloana tse likhoele le tse sa tloaelehang.Likaroloana li fetisetsoa ka boholo bo fapaneng, ho itšetlehile ka thepa ea phofo e hlokehang ke mokhoa oa ho etsa lihlahisoa.Ka mohlala, karolo e ka holimo e boreleli e hloka boholo ba likaroloana tse nyenyane ha phallo e ntle e ntlafatsoa ke boholo bo boholo ba likaroloana.
Phofo e ntle ea PTFE e hlahisoa ke polymerization ea TFE ka har'a metsi a nang le metsi ka pel'a motho ea qalang le ea surfactant.Polymerization ha e latele mokhoa o tloaelehileng oa emulsion empa e meng ea melao-motheo e sebetsang.Ho tsitsa ha ho hasana nakong ea polymerization, ho qoba ho kopana pele ho nako, ho leka-lekana khahlanong le tlhokahalo ea ho senya emulsion ho tsosolosa PTFE.Ho tsitsinyeha ha sekhahla se tlase ho bolokoa nakong ea polymerization ho sebelisoa maemo a surfactant a ka tlase ho mahloriso a bohlokoa a micelle.Sekhahla sa polymerization le sebopeho sa likaroloana le boholo li angoa ke mahloriso a surfactant.Boholo ba likaroloana bo hlahisoa karolong ea pele ea polymerization 'me e ntse e hōla ha potoloho e ntse e tsoela pele.Boima ba limolek'hule le sebopeho ka har'a karoloana li ka laoloa ho sebelisoa metsoako le maemo a polymerization.
Ts'ebetso e ts'oanang ea polymerization e etsa hore li-dispersions tsa metsi tsa PTFE e be phofo e ntle.Phatlalatso e tsepamisitsoe le ho tsitsisoa ho sebelisoa mefuta e fapaneng ea li-ionic le nonionic surfactants.Mekhoa e mengata ea mahloriso e tlalehiloe ho kenyelletsa electrodecantation, evaporation, le mocheso oa mocheso.Li-additives tsa lik'hemik'hale ho li bapisa le mokhoa oa ho etsa thepa kapa karolo ea litlhoko tsa thepa li ka fetola phallo ea ho qetela ea PTFE.
Metsoako e tlatsitsoeng e hlahisoa ho tsoa mefuteng eohle e meraro ea PTFE ho sebelisoa li-fillers tse kang fiber fiber, graphite, metal powder, carbon fiber, le tse ling.
Nako ea poso: Sep-24-2018