Raws li cov khoom siv roj carbon monoxide tshiab, Expanded Graphite (EG) yog cov khoom siv xoob thiab ntxeem tau zoo li cov khoom siv tau los ntawm ntuj graphite flake los ntawm intercalation, ntxuav, ziab thiab kub nthuav dav.EG Ntxiv rau cov khoom zoo heev ntawm ntuj graphite nws tus kheej, xws li txias thiab kub tsis kam, corrosion kuj thiab nws tus kheej lubrication, nws kuj muaj cov yam ntxwv ntawm softness, compression resilience, adsorption, ecological ib puag ncig kev sib koom tes, biocompatibility thiab hluav taws xob tiv thaiv uas ntuj graphite. tsis muaj.Raws li thaum ntxov 1860s, Brodie nrhiav tau nthuav graphite los ntawm cua sov ntuj graphite nrog tshuaj reagents xws li sulfuric acid thiab nitric acid, tab sis nws daim ntawv thov tsis pib mus txog rau ib puas xyoo tom qab.Txij thaum ntawd los, ntau lub teb chaws tau pib tshawb nrhiav thiab tsim cov graphite nthuav dav, thiab ua kom muaj kev tshawb fawb loj.
Expanded graphite ntawm qhov kub thiab txias tau instantly nthuav cov ntim ntawm 150 mus rau 300 zaug, los ntawm daim ntawv mus rau wormlike, thiaj li hais tias cov qauv yog xoob, ntxeem tau thiab nkhaus, qhov chaw saum npoo yog loj, lub zog saum npoo yog txhim kho, adsorption ntawm flake graphite yog txhim kho, thiab cov wormlike graphite tuaj yeem ua tus kheej-mosaic, uas ua rau nws cov softness, resilience thiab plasticity.
Expandable graphite (EG) yog graphite interlayer compound tau los ntawm ntuj flake graphite los ntawm tshuaj oxidation los yog electrochemical oxidation.Hais txog cov qauv, EG yog cov khoom siv nanoscale.Thaum EG tau txais los ntawm oxidation ntawm H2SO4 zoo tib yam yog raug kub siab tshaj 200 ℃, REDOX cov tshuaj tiv thaiv tshwm sim ntawm sulfuric acid thiab graphite carbon atoms, tsim ib tug loj npaum li cas ntawm SO2, CO2 thiab dej vapor, kom EG pib nthuav. , thiab ncav cuag nws qhov siab tshaj plaws ntim ntawm 1 100 ℃, thiab nws qhov kawg ntim tuaj yeem ncav cuag 280 zaug ntawm qhov pib.Cov cuab yeej no tso cai rau EG tua cov nplaim taws los ntawm qhov loj me me thaum muaj hluav taws kub.
Cov nplaim retardant mechanism ntawm EG belongs rau lub nplaim retardant mechanism ntawm solidification theem, uas yog nplaim retardant los ntawm kev ncua los yog cuam tshuam lub tsim ntawm combustible tshuaj los ntawm cov khoom khoom.EG Thaum rhuab mus rau ib qho twg, nws yuav pib nthuav dav, thiab cov graphite nthuav dav yuav dhau los ua cov duab vermicular nrog qhov ntom ntom ntawm qhov qub, yog li tsim cov txheej txheem rwb thaiv tsev zoo.Cov ntawv nthuav dav graphite tsis yog tsuas yog cov pa roj carbon monoxide hauv cov txheej txheem nthuav dav xwb, tab sis kuj tseem muaj cov txheej txheem rwb thaiv tsev, uas tuaj yeem ua kom sov rwb thaiv tsev, ncua sijhawm thiab nres lub decomposition ntawm polymer;Nyob rau tib lub sij hawm, ib tug loj npaum li cas ntawm tshav kub yog absorbed nyob rau hauv lub expansion txheej txheem, uas txo qhov kub ntawm lub system.Tsis tas li ntawd, thaum lub sij hawm kev nthuav dav, cov kua qaub ions nyob rau hauv lub interlayer raug tso tawm los txhawb lub cev qhuav dej thiab carbonization.
EG raws li kev tiv thaiv ib puag ncig tsis muaj halogen nplaim hluav taws, nws qhov zoo yog: tsis muaj tshuaj lom, tsis tsim cov pa phem thiab corrosive gases thaum cua sov, thiab tsim cov pa roj me me;Qhov ntxiv yog me me;Tsis muaj dej ntws;Muaj zog ib puag ncig adaptability, tsis muaj qhov tshwm sim tsiv teb tsaws;Uv stability thiab lub teeb stability yog zoo;Lub hauv paus yog txaus thiab cov txheej txheem tsim khoom yooj yim.Yog li ntawd, EG tau siv dav hauv ntau yam khoom siv hluav taws xob thiab hluav taws xob, xws li cov khoom siv hluav taws xob, hluav taws xob hluav taws xob, hluav taws kub retardant thiab anti-static coatings, cov hnab hluav taws kub, cov khoom siv hluav taws kub hnyiab, hluav taws kub retardant nplhaib thiab nplaim retardant plastics.
Post lub sij hawm: Nov-09-2023