Raws li cov khoom siv ua haujlwm tshiab, nthuav dav graphite (EG) yog cov khoom siv xoob thiab ntxeem tau zoo li cov khoom siv tau los ntawm ntuj graphite flakes los ntawm intercalation, ntxuav, ziab thiab kub-kub nthuav dav.Ntxiv nrog rau cov khoom zoo heev ntawm ntuj graphite xws li txias thiab kub tsis kam, corrosion kuj thiab nws tus kheej lubrication, EG kuj muaj cov yam ntxwv ntawm softness, compression resilience, adsorption, ecological thiab ib puag ncig kev sib koom ua ke, 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.Txawm li cas los xij, nws daim ntawv thov pib tom qab ib puas xyoo.Txij thaum ntawd los, ntau lub teb chaws tau ua tiav cov kev tshawb fawb thiab kev loj hlob ntawm graphite nthuav dav thiab ua rau muaj kev tshawb fawb loj.

Expanded graphite tuaj yeem nthuav dav 150 ~ 300 zaug hauv qhov ntim ntawm qhov kub thiab txias, thiab hloov pauv ntawm flaky mus rau vermicular, ua rau cov qauv xoob, ntxeem tau thiab nkhaus, nthuav dav thaj chaw, txhim kho lub zog saum npoo, txhim kho adsorption ntawm flake graphite, thiab nws tus kheej-chimerism ntawm vermicular graphite, uas ua rau nws yooj yim, resilience thiab plasticity.
Ob peb txoj kev loj hlob ntawm nthuav graphite yog raws li nram no:

1. Nthuav graphite rau lub hom phiaj tshwj xeeb
Kev sim qhia tau hais tias graphite worms muaj cov haujlwm ntawm absorbing electromagnetic nthwv dej, uas ua rau nthuav graphite muaj siab heev daim ntawv thov tub rog.Ob tus tub rog Asmeskas thiab peb cov tub rog tau ua kev tshawb fawb hauv cheeb tsam no.Cov graphite nthuav dav yuav tsum ua tau raws li cov cai hauv qab no: (1) qis qis pib nthuav dav kub thiab loj expansion ntim;(2) Cov cuab yeej tshuaj lom neeg ruaj khov, thiab qhov nthuav dav ntawm qhov pib tsis lwj tom qab 5 xyoos ntawm kev khaws cia;(3) Qhov saum npoo ntawm cov graphite nthuav dav yog nruab nrab thiab tsis muaj corrosion rau cov ntaub ntawv cartridge.

2. Granular nthuav graphite
Me me-particle nthuav graphite feem ntau yog hais txog 300-lub hom phiaj nthuav dav graphite nrog kev nthuav dav ntawm 100ml / g.Cov khoom no feem ntau yog siv rau cov nplaim hluav taws-retardant coatings, thiab nws qhov kev thov yog loj.

3. Expanded graphite nrog siab pib expansion kub
Qhov pib nthuav dav ntawm qhov nthuav dav graphite nrog qhov siab pib nthuav dav yog 290-300 ℃, thiab qhov ntim nthuav dav yog ≥ 230ml / g.Hom kev nthuav dav graphite no tsuas yog siv rau cov nplaim hluav taws xob ntawm engineering plastics thiab roj hmab.Cov khoom no tau ua tiav tiav los ntawm Hebei Agricultural University thiab thov rau lub teb chaws patent.

4. Nto hloov graphite
Thaum nthuav dav graphite yog siv los ua cov khoom siv hluav taws xob, nws suav nrog kev solubility ntawm graphite thiab lwm yam khoom.Vim hais tias ntawm high degree ntawm mineralization nyob rau saum npoo ntawm graphite, nws tsis yog lipophilic los yog hydrophilic.Yog li ntawd, nws yog ib qho tsim nyog yuav tau hloov kho qhov chaw ntawm graphite los daws qhov teeb meem ntawm kev sib raug zoo ntawm graphite thiab lwm yam khoom.Qee tus neeg tau thov kom ua kom lub ntsej muag ntawm graphite, uas yog, kom npog cov graphite nrog cov yeeb yaj kiab dawb.Qhov no yog ib qho teeb meem nyuaj los daws.Nws suav nrog cov tshuaj membrane los yog chemistry saum npoo, uas tuaj yeem ua tiav hauv chav kuaj.Muaj teeb meem hauv industrialization.Qhov no hom dawb expandable graphite yog tsuas yog siv raws li nplaim retardant txheej.

5. Tsawg pib expansion kub thiab tsis tshua muaj kub nthuav graphite
Hom graphite nthuav dav no pib nthuav dav ntawm 80-150 ℃, thiab nws qhov ntim nthuav dav mus txog 250ml / g ntawm 600 ℃.Cov teeb meem hauv kev npaj expandable graphite ntsib tus mob no nyob rau hauv: (1) xaiv tus neeg sawv cev intercalation tsim nyog;(2) Tswj thiab tswj cov txheej txheem kom qhuav;(3) Kev txiav txim siab ntawm noo noo;(4) Kev daws teeb meem ntawm kev tiv thaiv ib puag ncig.Tam sim no, kev npaj ntawm qis-kub expandable graphite tseem nyob rau theem sim.