Polytetrafluoroethylene ndeye synthetic fluoropolymer ye tetrafluoroethylene ine akawanda maapplication.Inonyanya kuzivikanwa zita remhando yePTFE-yakavakirwa mafomula ndeye polymer neChemours.Nzvimbo yakanyungudika: 620.3°F (326.8°C);Formula: (C2F4)n;Density: 2.2 g/cm³;IUPAC ID: poly(1,1,2,2-tetrafluoroethylene).
PTFE inogadzirwa nemahara-radical polymerization mechanism mune ine mvura midhiya kuburikidza nekuwedzera polymerization yeTFE mune batch process.Iyo yekutanga yepolymerization inowanzova mvura-inonyungudika peroxide yakadai seammonium persulfate kana disuccinic peroxide.A redox catalyst inoshandiswa kune yakaderera tembiricha polymerization.PTFE inogadzirwa nekumiswa (kana slurry) polymerization pasina surfactant kuwana granular resin kana ne perfluorinated surfactant (emulsion polymerization) yakadai seammonium perfluorooctanoate kugadzira poda yakanaka uye dispersion products.Polymerization tembiricha uye kumanikidzwa kazhinji kubva 0 kusvika 100 C uye 0.7 kusvika 3.5 MPa.
Granular PTFE inogadzirwa ne polymerizing TFE chete kana nekushandisa trace uwandu hwemacomonomers.A peroxide initiator, zvishoma kana kusavapo surfactant, uye zvimwe zvinowedzera zvinogona kunge zviripo mu aqueous polymerization medium iyo inomutswa zvine simba uye dzimwe nguva inovharidzirwa nealkaline solution.Yakawanda yepolymer inoumbwa muchikamu chegasi muchimiro chetambo uye zvisina kuumbwa zvimedu.Izvo zvimedu zvinoendeswa kune zvakasiyana-siyana, zvichienderana nehupfu hunodiwa nekugadzirwa kwekugadzira.Semuenzaniso, chikamu chakatsetseka chepamusoro chinoda diki diki saizi uku kuyerera kwakanaka kunovandudzwa nehukuru particle size.
Fine powder PTFE inogadzirwa nepolymerization yeTFE mune aqueous medium pamberi pe initiator uye surfactant.Iyo polymerization haiteveri yakajairwa emulsion mashandiro asi mamwe emisimboti, anoshanda.Iko kugadzikana kwekupararira panguva yepolymerization, kudzivirira nguva isati yakwana coagulation, yakaenzana pamusoro pekudiwa kwekupwanya emulsion kuti uwanezve PTFE.Low shear rate agitation inochengetwa panguva yepolymerization uchishandisa surfactant mazinga pazasi peyakakosha micelle concentration.Mwero wepolymerization uye chidimbu chimiro uye saizi zvinokanganiswa nekusangana kweiyo surfactant.Zvizhinji zvezvimedu zvinogadzirwa muchikamu chekutanga chepolymerization uye inokura sezvo kutenderera kunofamba.Molecular huremu uye kuumbwa mukati mechikamu chinogona kudzorwa uchishandisa iyo polymerization zvinongedzo uye mamiriro.
Iyo yakafanana polymerization maitiro inoita aqueous dispersions yePTFE sehupfu hwakatsetseka.Kupararira kwakanyanyisa uye kwakagadziriswa uchishandisa zvakasiyana-siyana zveionic uye nonionic surfactants.Nzira dzinoverengeka dzekuisa dzakataurwa dzinosanganisira electrodecantation, evaporation, uye thermal concentration.Makemikari anowedzera kuti aenzane nawo nemaitiro ekugadzira kana chikamu chezvivakwa zvinodikanwa zvinogona kushandura yekupedzisira PTFE kupararira.
Mishonga yakazadzwa inogadzirwa kubva kune ese matatu mafomu ePTFE achishandisa mafirita akadai segirazi fiber, graphite, simbi poda, kabhoni fiber, uye mamwe.
Nguva yekutumira: Sep-24-2018