Polytetrafluoroethylene shine fluoropolymer na roba na tetrafluoroethylene wanda ke da aikace-aikace masu yawa.Mafi sanannun sunan alamar ƙirar PTFE shine polymer ta Chemours.Matsayin narkewa: 620.3°F (326.8°C); Formula: (C2F4) n; Yawan: 2.2 g/cm³; IUPAC ID: poly(1,1,2,2-tetrafluoroethylene).
Ana samar da PTFE ta hanyar injin polymerization na kyauta a cikin kafofin watsa labarai mai ruwa da tsaki ta hanyar ƙari polymerization na TFE a cikin tsari na tsari.Mai farawa don polymerization yawanci peroxide ne mai narkewa kamar ammonium persulfate ko disuccinic peroxide.Ana amfani da redox mai kara kuzari don ƙarancin zafin jiki na polymerization.Ana samar da PTFE ta hanyar dakatarwa (ko slurry) polymerization ba tare da surfactant don samun resins na granular ko tare da perfluorinated surfactant (emulsion polymerization) kamar ammonium perfluorooctanoate don samar da lafiya foda da watsawa kayayyakin.Polymerization zafin jiki da matsa lamba yawanci kewayo daga 0 zuwa 100 C da 0.7 zuwa 3.5 MPa.
Ana samar da PTFE na Granular ta hanyar yin polymerizing TFE kadai ko ta hanyar amfani da adadin masu shiga tsakani.Mai ƙaddamar da peroxide, kaɗan ko babu surfactant, da sauran abubuwan ƙarawa na iya kasancewa a cikin matsakaicin polymerization mai ruwa wanda ake motsawa da ƙarfi kuma wani lokaci ana buffer ta hanyar maganin alkaline.Yawancin polymer an samo su ne a cikin lokacin gas a cikin sifa na stringy da sifofi marasa tsari.Ana ƙaddamar da barbashi zuwa girma dabam dabam, dangane da kaddarorin foda da ake buƙata ta hanyar ƙirƙira.Alal misali, wani smoother surface part yana bukatar karami barbashi size yayin da mai kyau kwarara da aka inganta da ya fi girma barbashi size.
Fine foda PTFE aka samar da polymerization na TFE a cikin wani ruwa matsakaici a gaban wani mai farawa da surfactant.polymerization baya bin tsarin emulsion na al'ada amma wasu ƙa'idodi, waɗanda ke aiki.A zaman lafiyar watsawa a lokacin polymerization, don kauce wa wanda bai kai ba coagulation, an daidaita da bukatar karya emulsion don dawo da PTFE.Ana kiyaye ƙarancin tashin hankali yayin da ake yin polymerization ta amfani da matakan surfactant da ke ƙasa da mahimmancin taro na micelle.Matsakaicin adadin polymerization da siffar barbashi da girman su yana tasiri ta hanyar maida hankali na surfactant.Yawancin barbashi suna samuwa ne a farkon ɓangaren polymerization kuma suna girma yayin da zagayowar ke ci gaba.Nauyin kwayoyin halitta da abun da ke ciki a cikin barbashi za a iya sarrafawa ta amfani da sinadaran polymerization da yanayi.
Haka polymerization tsari sa ruwa mai ruwa dispersions na PTFE a matsayin lafiya foda.An tattara tarwatsawa kuma an daidaita shi ta amfani da nau'ikan surfactants na ionic da nonionic iri-iri.An ba da rahoton hanyoyin tattara bayanai da yawa ciki har da electrodecantation, evaporation, da thermal maida hankali.Additives na sinadarai don daidaita su tare da tsarin ƙirƙira ko buƙatun kadara na sashi na iya canza tarwatsawar PTFE ta ƙarshe.
Cikakkun mahadi ana samar da su daga duk nau'ikan PTFE guda uku ta amfani da filaye kamar fiber gilashi, graphite, foda karfe, fiber carbon, da sauransu.
Lokacin aikawa: Satumba-24-2018