A matsayin sabon kayan aiki na carbon, Expanded Graphite (EG) wani abu ne mai sako-sako da tsutsotsi-kamar abu wanda aka samo daga flake graphite na halitta ta hanyar haɗawa, wankewa, bushewa da faɗaɗa zafin jiki.EG Baya ga kyawawan kaddarorin graphite na halitta kanta, irin su sanyi da juriya mai zafi, juriya na lalata da lubrication na kai, Hakanan yana da halaye na laushi, juriya na matsawa, adsorption, daidaita yanayin muhalli, biocompatibility da juriya na radiation cewa graphite na halitta ba shi da.A farkon shekarun 1860, Brodie ya gano graphite mai fadada ta hanyar dumama graphite na halitta tare da reagents na sinadarai irin su sulfuric acid da nitric acid, amma aikace-aikacensa bai fara ba sai bayan shekaru dari.Tun daga wannan lokacin, ƙasashe da yawa sun ƙaddamar da bincike da haɓaka faɗuwar graphite, kuma sun sami manyan ci gaban kimiyya.
Fadada graphite a babban zafin jiki na iya faɗaɗa ƙarar 150 zuwa sau 300 nan take, daga takarda zuwa kamannin tsutsotsi, don haka tsarin ya kasance sako-sako, porous da lankwasa, an ƙara girman farfajiyar, ingantaccen ƙarfin saman, tallan graphite flake shine ingantacce, kuma graphite mai kama da tsutsotsi na iya zama mosaic na kansa, wanda ke ƙara laushi, juriya da filastik.
Expandable graphite (EG) wani fili ne na graphite interlayer da aka samu daga graphite flake na halitta ta hanyar iskar oxygen da iskar shaka ko iskar oxygen.Dangane da tsari, EG abu ne mai haɗaka na nanoscale.Lokacin da EG samu ta hanyar hadawan abu da iskar shaka na talakawa H2SO4 ne hõre wani high zafin jiki sama da 200 ℃, da REDOX dauki faruwa tsakanin sulfuric acid da graphite carbon atoms, samar da babban adadin SO2, CO2 da ruwa tururi, sabõda haka, EG fara fadada. , kuma ya kai matsakaicin girmansa a 1 100 ℃, kuma ƙarar ta ƙarshe na iya kaiwa sau 280 na farkon.Wannan kadarar tana ba EG damar kashe harshen wuta ta ɗan ƙara girman girma a yayin da gobara ta tashi.
Injin mai hana harshen wuta na EG yana cikin tsarin hana harshen wuta na lokaci mai ƙarfi, wanda shine jinkirin wuta ta hanyar jinkirtawa ko katse haɓakar abubuwan da ke iya ƙonewa daga abubuwa masu ƙarfi.EG Lokacin da aka yi zafi zuwa wani wuri, zai fara faɗaɗawa, kuma graphite da aka faɗaɗa zai zama siffa mai ƙarfi tare da ƙarancin ƙarancin ƙima daga ma'aunin asali, don haka samar da kyakkyawan rufin rufi.Fadada graphite ba wai kawai tushen carbon ba ne a cikin tsarin da aka faɗaɗa ba, har ma da rufin rufin, wanda zai iya tasiri mai zafi mai zafi, jinkirta da dakatar da bazuwar polymer;A lokaci guda kuma, ana ɗaukar zafi mai yawa a yayin aikin haɓakawa, wanda ya rage yawan zafin jiki na tsarin.Bugu da ƙari, a lokacin aikin haɓakawa, ana fitar da ions acid a cikin interlayer don inganta rashin ruwa da carbonization.
EG a matsayin mai kare muhalli mara halogen harshen wuta, fa'idodinsa sune: mara guba, baya haifar da iskar gas mai guba da lalata lokacin da aka yi zafi, kuma yana samar da iskar hayaki kaɗan;Adadin kari kadan ne;Babu digo;Ƙarfin daidaitawar muhalli, babu wani abin ƙaura;Uv kwanciyar hankali da kwanciyar hankali suna da kyau;Tushen ya isa kuma tsarin masana'anta yana da sauƙi.Saboda haka, EG an yadu amfani da iri-iri na harshen retardant da kayan hana gobara, kamar wuta hatimi, wuta alluna, wuta retardant da anti-a tsaye coatings, wuta jakunkuna, roba toshe wuta abu, wuta retardant zobe da harshen wuta retardant robobi.
Lokacin aikawa: Nuwamba-09-2023