Lithempereichara tse ka holimo ho 77°C ha li amohelehe bakeng sa likarolo tsa li-elastomers le li-plastiki tse ngata, athe PTFE e mamella mocheso o ka holimo ho 260°C.Esita le ka tlase ho 77 ° C, haeba li-acids tse senyang ho tšepe le lihlahisoa tsa tlhaho li kopantsoe, li-liner le likarolo tsa PTFE li atisa ho khethoa hobane li-elastomers le li-plastiki tse ling hangata li haelloa ke ho hanyetsa ho ruruha le ho nolofatsa ha solvent.
Ka inertness ea lik'hemik'hale, re bolela seoPTFELi-resin tsa fluorocarbon li ka tsoela pele ho kopana le ntho e 'ngoe ntle le karabelo e bonoang ea lik'hemik'hale e etsahalang.Ka kakaretso, li-resine tsa PTFE fluorocarbon li inert ka lik'hemik'hale.Leha ho le joalo, polelo ena, joalo ka litlhaloso tsohle tse akaretsang, e tlameha ho tšoaneleha haeba e tla nepahala ka ho phethahetseng.Tšoaneleho e ke ke ea lebisa pherekano, leha ho le joalo, haeba motho a hopola lintlha tsa motheo mabapi le boitšoaro ba li-resin tsa PTFE.
Kakaretso e tloaelehileng ea tlhaloso ea lintlha tse fapaneng tsa liteko e ka khelosa, hobane e ka kopanya mefuta e fapaneng ea boitšoaro ba "Chemical".Haeba tlhaloso e hlakile, e tlameha ho khetholla lipakeng tsa tšebetso ea lik'hemik'hale le liketso tsa 'mele joalo ka ho monya.Tlhaloso e tlameha ho thusa mosebelisi ho ela hloko likamano tsa sebopeho le lik'hemik'hale tse ka amang ts'ebeliso e itseng.
Ka mohlala, li-resin tsa PTFE li ke ke tsa ameha ka ho qoelisoa ka har'a aqua regia.Leha ho le joalo haeba mocheso le khatello ea sephetho ea reagent ena e phahame, ho kenngoa ha likarolo tsa reagent ka resin le hona ho tla eketseha.Liphetoho tse latelang, joalo ka tahlehelo ea tšohanyetso ea khatello, li ka ba kotsi 'meleng ka lebaka la ho atoloha ha mouoane o monyelitsoeng ka har'a resin.Ka hona, ho hlakile hore ha re bua ka lik'hemik'hale tsa PTFE re tlameha ho khetholla pakeng tsa liphetoho tsa lik'hemik'hale tse tiileng, joalokaha re hlalositse ka "Ho lumellana ha lik'hemik'hale" le liketso tsa 'mele, tse kang "ho monya" ho kopantsoe le khatello ea mochine le mocheso.
Ka har'a mocheso o tloaelehileng oa tšebeliso, li-resin tsa PTFE li hlaseloa ke lik'hemik'hale tse fokolang ho e-na le ho ngola lik'hemik'hale tseo li lumellanang le tsona.Li-reactants tsena ke tse ling tsa li-oxidizer tse mabifi le tse fokotsang tse tsejoang.Elemental sodium kamanong e haufi-ufi le fluorocarbons e tlosa fluorine ho molek'hule ea polymer.Karabelo ena e sebelisoa haholo litharollong tsa anhydrous ho emisa bokaholimo ba PTFE e le hore li-resin li ka khomarela.Litšepe tse ling tsa alkali (potasiamo, lithium, joalo-joalo) li itšoara ka tsela e tšoanang.
Metsoako e haufi-ufi ea litšepe tse arohaneng hantle (mohlala, aluminium kapa magnesium) tse nang le li-resin tse phofshoana tsa fluorocarbon li ka itšoara ka mabifi ha li hotetsoa, empa mocheso oa mocheso o phahame haholo ho feta mocheso o khothalletsoang o ka holimo oa tšebeletso bakeng sa li-resine tsa PTFE.Li-oxidizer tse matla haholo, fluorine (F2) le metsoako e amanang le eona (mohlala, chlorine trifluoride, CIF3), e ka sebetsanoa ke PTFE feela ka tlhokomelo e kholo le ho lemoha likotsi tse ka bang teng.Fluorine e kenngoa ka har'a li-resin, 'me ka kamano e haufi-ufi motsoako o ba le maikutlo a matla ho mohloli oa mollo o kang tšusumetso.
Maemong a mang kapa haufi le mocheso o sisintsoeng oa moeli oa litšebeletso oa 260 ° C bakeng sa TFE & PFA, le 204 ° C bakeng sa FEP, lik'hemik'hale tse 'maloa tse maemong a holimo li tlalehiloe li sebetsa ho PTFE.Tlhaselo e tšoanang le sodium etch e hlahisitsoe ka mocheso o phahameng joalo ka 80% NaOH kapa KOH, li-hydrides tsa tšepe tse kang boranes (mohlala, B2H6), aluminium chloride, ammonia (NH3), le li-amine tse itseng (R-NH2) le imines ( R = NH).Hape, tlhaselo e liehang ea oxidative e bonoa ke 70% ea nitric acid tlas'a khatello ea 250 ° C.Ho hlokahala liteko tse khethehileng ha maemo a joalo a ho fokotsa kapa a oxidizing a atameloa.
Kahoo, ntle le mekhelo joalo ka ha ho boletsoe, li-resin tsa PTFE li bonts'a mefuta e mengata e fapaneng ea ts'ebetso ea lik'hemik'hale le mocheso.Empa moreki kapa mohlahlobi oa likarolo tsa PTFE o boetse o hloka ho tseba le ho utloisisa mefokolo ea eona mabapi le tikoloho e tloaelehileng ea lik'hemik'hale.Ho fapana le meeli ea litšepe, hangata ha se lik'hemik'hale tse rekang 'mele ka tlhaho.Liphello tsa mocheso, khatello, le ho kenngoa ha lik'hemik'hale ho PTFE, le ho sebelisana ha tsona, ke tsona tseo ka nako e tloaelehileng li fokotsang maemo ao PTFE e tla sebetsa ka mokhoa o khotsofatsang.Kaha sena se fapane le hoo e batlang e le thepa leha e le efe ea kaho, ho hlokahala hore ho hlahlojoe ka hloko litlhaloso tse qaqileng haholoanyane tse latelang.
Nako ea poso: Oct-04-2019