Njengesixhobo esitsha sekhabhoni esisebenzayo, i-Expanded Graphite (EG) yinto ekhululekileyo kunye ne-porous-like worm efunyenwe kwi-graphite flake yendalo ngokudibanisa, ukuhlamba, ukomisa kunye nokwandiswa kweqondo lokushisa eliphezulu.EG Ukongeza kwiipropathi ezigqwesileyo zegraphite yendalo ngokwayo, njengokumelana nokubanda kunye nobushushu, ukuxhathisa umhlwa kunye nokuzithambisa, ikwaneempawu zokuthamba, ukomelela koxinzelelo, i-adsorption, ulungelelwaniso lwendalo esingqongileyo, ukuhambelana kwezinto eziphilayo kunye nokumelana nemitha yegrafu yendalo. akanayo.Kwasebutsheni beminyaka yee-1860, uBrodie wafumanisa igraphite eyandisiweyo ngokufudumeza igraphite yendalo ngeekhemikhali ezisebenza njenge-sulfuric acid kunye ne-nitric acid, kodwa ukusetyenziswa kwayo akuzange kuqale de kwaba likhulu leminyaka kamva.Ukusukela ngoko, amazwe amaninzi aqalise uphando kunye nophuhliso lwegraphite eyandisiweyo, kwaye enze impumelelo enkulu yesayensi.
I-graphite eyandisiweyo kwiqondo lokushisa eliphezulu inokwandisa ngokukhawuleza umthamo we-150 ukuya ku-300 amaxesha, ukusuka kwi-sheet ukuya kwi-wormlike, ukuze isakhiwo sikhululekile, sine-porous kwaye sigobile, indawo ephezulu yandiswa, amandla angaphezulu aphuculwe, i-adsorption ye-flake graphite iphuculwe, kwaye igraphite efana nentshulube inokuba yi-self-mosaic, eyandisa ukuthamba kwayo, ukomelela kunye neplastiki.
Igraphite ekwandiswayo (EG) yi-graphite interlayer compound efunyenwe kwi-natural flake graphite nge-chemical oxidation okanye i-electrochemical oxidation.Ngokubhekiselele kwisakhiwo, i-EG yinto edibeneyo ye-nanoscale.Xa i-EG ifunyenwe nge-oxidation ye-H2SO4 eqhelekileyo iphantsi kobushushu obuphezulu ngaphezu kwe-200 ℃, ukusabela kwe-REDOX kwenzeka phakathi kwe-asidi yesulfuric kunye ne-graphite carbon atom, ivelisa isixa esikhulu se-SO2, i-CO2 kunye nomphunga wamanzi, ukuze i-EG iqalise ukwandisa. , kwaye ifikelela kumthamo wayo ophezulu kwi-1 100℃, kwaye umthamo wayo wokugqibela unokufikelela kumaxesha angama-280 okuqala.Le propati ivumela i-EG ukucima ilangatye ngokunyuka okwethutyana kubukhulu xa kwenzeka umlilo.
Indlela yokubuyiswa komlilo ye-EG yeyomsebenzi wokubuyiswa komlilo wesigaba sokuqina, esinqanda ilangatye ngokulibazisa okanye ngokuphazamisa ukuveliswa kwezinto ezitsha kwizinto eziqinileyo.I-EG Xa ishushu ukuya kwinqanaba elithile, iya kuqalisa ukwanda, kwaye i-graphite eyandisiweyo iya kuba yimilo ye-vermicular kunye ne-density ephantsi kakhulu ukusuka kwisikali sokuqala, ngaloo ndlela yenza i-insulation layer.Iphepha legraphite elandisiweyo alikho kuphela umthombo wekhabhoni kwinkqubo eyandisiweyo, kodwa kunye noluhlu lwe-insulation, olunokuthi lusebenze ngokufanelekileyo ukufudumala ukushisa, ukulibaziseka nokumisa ukubola kwepolymer;Ngexesha elifanayo, ubushushu obuninzi buthatyathwa ngexesha lenkqubo yokwandisa, okunciphisa ukushisa kwenkqubo.Ukongezelela, ngexesha lenkqubo yokwandisa, i-acid ions kwi-interlayer ikhululwe ukukhuthaza ukuchithwa kwamanzi kunye ne-carbonization.
I-EG njenge-halogen-free yokusingqongileyo i-flame retardant, iingenelo zayo zezi: ayinayo ityhefu, ayivelisi i-toxic and corrosive gases xa ishushu, kwaye ivelisa igesi encinci ye-flue;Imali eyongeziweyo incinci;Akukho kuvuza;Ukuguquguquka okuqinileyo kokusingqongileyo, akukho nto yokufuduka;Ukuzinza kwe-Uv kunye nokuzinza kokukhanya kulungile;Umthombo wanele kwaye inkqubo yokuvelisa ilula.Ngoko ke, i-EG isetyenziswe ngokubanzi kwiintlobo ezahlukeneyo ze-flame retardant kunye nezixhobo zomlilo, ezifana nezitywina zomlilo, iibhodi zomlilo, i-fire retardant kunye ne-anti-static coatings, izikhwama zomlilo, izinto zeplastiki zokuvala umlilo, i-ring retardant ring kunye ne-flame retardant plastics.
Ixesha lokuposa: Nov-09-2023