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ID:33662220
大小:2.07 MB
页数:76页
时间:2019-02-28
《超细石墨粉体制备与分散研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要石墨具有很强的滑腻性和韧性,而超细石墨粉以其独特的性能更足广泛应用于各个领域。如何获得超细石蹊粉,一直是石墨深加工的热点和难点。本论文主要研究了石墨的超细粉碎及其分散。采用紫外分光光度计分析、‘一电位分析,研究发现高分子表面活性剂CMC(羧甲基纤维素钠)和ZW(合成分散剂)对石墨有良好的分散性,而ZW21(mol。:molCMC=2:1)对石墨悬浮液的分数性最好,最佳加入量为石墨粉的5wt%。采用搅拌磨湿法球磨制备超细石墨粉,系统地研究了浆料浓度、球料比、球磨时间及添加分散荆对石墨超细研磨效果的影响,采用最佳研磨工艺条件后,研磨70h后,得到中位粒径d。=1.OlItIl
2、l的超细粉,最佳工艺参数如下:浆料浓度为25%,球料比为10:1,分散荆(toolzw:mOlCMc=2:1)添加量为5砒%。SEM分析可知石墨粒子保持很好的片状形貌。混合分散剂ZW21对石墨悬浮液有良好的分散效果,添加分散剂后由于分散剂的静电稳定和空间位阻作用提高了石墨超细粉碎的研磨效果。CMC和ZW都和石墨表面发生了化学吸附,其作用模型为羰基在石墨的边缘发生了化学吸附,羟基、一cH:和一cH基团使剥离石墨极易与水形成氢键,因而有良好的亲水性,ZW21无论在低浓度还是在高浓度区都是发生表面胶团化作用。关键词:鳞片石墨;分散剂;超细粉碎;水性石墨悬浮液ABSTRACTGrap
3、hitehasexceedinglubricantandtoughproperties,andtheultrafineparticleofgraphitehasbeenusedinmanyfieldsforitsexcellentproperties.Howtogetultrafinegraphiteeffectivelyareahotissueandadifficultproblemforgraphitedeepprocess.Thisdissertationmainlyinvolvesinstudyofsuperfinegrindingongraphiteanddispe
4、rse.BytestingtheabsorbencyandZetapotentialstudythedispersingmechanismofultrafmegraphiteparticles.ItwasfoundthatthemacromoleculesurfactantCMCandZWhaveeffectivedispersionfortheaqueousgraphiteslurry,andwhenaddtheirmixtureZW21(molzw:mOlcMc=2:1)whichisonly5percentofthegraphiteweighthasthebestdis
5、perseeffect.1hewetstirredballmillinghasbeenusedtothepreparationofthegraphiteparticles.Theinfluenceofthemainoperationparameters,such懿pulpdensity,medium/materialratio,grindingtimeanddispersants,onsuperfinegrindingefficiencyofstirredmillwerestudiedsystematically.Underthebesttechnologyafter70hg
6、rindingwecallgetthefineparticletheds0ofwhichis1.Ol}lm.theresultsofexperimentandtheparametersareasfollow:25%concentrationofslurry,thegrindingtimeof70h,themedium/materialratioof10:1,theoptimumadditionofdispersantmixture(molzw:mOIcMc=2:1)5%.SEManalyzeshowedthatafter70hgrindingtimetheflakyshape
7、ofgraphiteparticlesiswellprotected.Asthestaticstabilizationandsterichindranceeffect,themixturedispersantZW21havetheexcellenteffecttotheaqueousgraphiteslurry.Therefore,ultrafinegrindingefficiencyiShighlyraised.CMCandZWareallhavechemicaladsorptiononthesurf
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