Polytetrafluoroethylene waa fluoropolymer synthetic ee tetrafluoroethylene oo leh codsiyo badan.Magaca caanka ah ee ugu caansan qaababka PTFE-ku salaysan waa polymer by Chemours.Meesha dhalaalaysa: 620.3°F (326.8°C);Qaabka: (C2F4)n; Cufnaanta: 2.2 g/cm³;IUPAC ID: poly(1,1,2,2-tetrafluoroethylene).
PTFE waxaa soo saara habka polymerization-ka xorta ah ee warbaahinta aqueous iyada oo loo sii marayo polymerization TFE ee habka dufcada.Bilawga polymerization caadi ahaan waa peroxide biyo-milmi leh sida ammonium persulfate ama disuccinic peroxide.Dareemiyaha redox waxa loo isticmaalaa polymerization heerkulka hooseeya.PTFE waxaa lagu soo saaraa cayrinta (ama slurry) polymerization iyada oo aan lahayn surfactant si loo helo resins granular ama leh surfactant perfluorinated (emulsion polymerization) sida ammonium perfluorooctanoate si loo soo saaro budo ganaax ah iyo alaabooyin kala firidhsan.Heerkulka polymerization iyo cadaadiska inta badan waxay u dhexeeyaan 0 ilaa 100 C iyo 0.7 ilaa 3.5 MPa.
PTFE Granular waxaa lagu soo saaraa polymerization TFE kaligiis ama iyadoo la isticmaalayo raadadka qiyaasaha komonmerers.Bilawga peroxide, wax yar ama aan lahayn surfactant, iyo waxyaabo kale oo lagu daro ayaa laga yaabaa inay ku jiraan dhexdhexaadiyaha polymerization aqueous kaas oo si xoog leh loo walaaqay oo marmarka qaarkood lagu daboolay xal alkaline ah.Inta badan polymer-ka waxaa lagu sameeyay wajiga gaaska ee qaabka xargaha iyo qaybo qaabaysan oo aan caadi ahayn.Qaybaha waxaa loo qaybiyaa qiyaaso kala duwan, iyadoo ku xiran sifooyinka budada ee looga baahan yahay habka wax-soo-saarka.Tusaale ahaan, qayb ka mid ah dusha sare waxay u baahan tahay cabbir yar oo qayb ka yar halka socodka wanaagsan lagu hagaajiyo cabbirka qaybta weyn.
budada Fine PTFE waxaa soo saara polymerization of TFE dhexdhexaad ah aqueous iyadoo ay joogaan hindise iyo surfactant ah.polymerization ma raacdo habka emulsion caadiga ah laakiin qaar ka mid ah mabaadi'da, kuwaas oo khuseeya.Xasiloonida kala firdhisanaanta inta lagu jiro polymerization, si looga fogaado xinjirowga hore, ayaa dheellitiran oo ka soo horjeeda baahida loo qabo in la jebiyo emulsion si loo soo kabsado PTFE.Kicinta heerka dhogorta hoose waa la ilaaliyaa inta lagu guda jiro polymerization iyadoo la isticmaalayo heerar sare oo ka hooseeya diiradda micele ee muhiimka ah.Heerka polymerization iyo qaabka qayb iyo cabbirka waxaa saameeya diiradda saarista.Qaybaha ugu badan waxay ka soo baxaan qaybta hore ee polymerization waxayna koraan marka wareeggu socdo.Miisaanka molecular iyo ka kooban ee ku jira qayb ka mid ah waxaa lagu xakameyn karaa iyadoo la isticmaalayo maaddooyinka polymerization iyo xaaladaha.
Habka isku midka ah ee polymerization ayaa ka dhigaya kala firdhinta aqueous ee PTFE sida budo ganaax ah.Kala firdhisku waa la ururiyey oo waa la xasiliyey iyadoo la isticmaalayo noocyo kala duwan oo ah surfactants ionic iyo nonionic.Dhowr habab oo xoog-saarid ah ayaa la soo sheegay oo ay ku jiraan electrodecantation, uumi-baxa, iyo diirad saarista kulaylka.Waxyaalaha lagu daro kiimikaad si ay ula jaanqaadaan habka wax-soo-saarka ama qayb ka mid ah shuruudaha hantida waxay wax ka bedeli karaan kala firdhinta PTFE ee u dambaysa.
Xeryahooda la buuxiyey waxaa laga soo saaraa dhammaan saddexda nooc ee PTFE iyadoo la isticmaalayo buuxinta sida fiber galaas, graphite, budada birta, fiber carbon, iyo kuwa kale.
Waqtiga post: Sep-24-2018