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20101139FujianArchitecture&ConstructionNo12010Vol1391,2(1400030;2361004):木质素磺酸钠是一种常见的减水剂,通过对其进行化学改性,可以提高减水率,同时改善木质素磺酸钠在混凝土应用过程中强度偏低的缺点本文通过改变氧化剂的用量还原剂的用量氧化温度氧化时间和pH值,考察反应条件的改变对其减水率的影响,并通过红外光谱对改性后产品进行分子结构分析分析表明,改性后木质素磺酸钠分子结构中空间位阻小的基团含量减少,空间位阻大的基团含量增加,有效减少了水泥颗粒团聚现象的发生,减水率和抗压强度比明显提高:木质素磺酸钠氧化改性:TU528.042.2:A:1004-6135(2010)01-0123-03TheModifiedResearchoftheSodiumLignosulfonateWater-reducerMaXiuxing1,2(1TheMaterialsCollege,ChongqingUniversity400030;2XiamenAcademyofBuildingResearchGroup361004)Abstract:Thesodiumlignosulfonateisacommonkindofwater-reducer.Itcanbeelevatedwater-reducingrateandimprovedthelowerstrengthinconcreteapplicationprocessafterchemicalmodification.Thispaperbychangingtheamountofoxidant,thea-mountofreductant,oxidationtemperature,oxidationtimeandpHvalues,examinedtheimpactofitswater-reducingratioafterthereactionconditionschangesandanalysedthemolecularstructureofthemodifiedproductbyinfraredspectroscopy.Analysisshowedthataftermodificationthecontentofthestericsmallgroupcontentreducedinthemolecularstructureofthesodiumligno-sulfonate,whilethestericlargegroupwasincreased.Themodifiedproductcouldreducetheoccurrenceofagglomerationofcementparticleseffectively,improvethewater-reducerratandanti-compressivestrengthratiosignificantly.Keywords:SodiumLignosulfonateOxidationModified:,,1973,,:2009-11-30,,,,,[1,2],,,,,[3],111,,;H2O2V2O5(NH4)4Ce(NO4)6FeSO4H2SO4,;,;PO425,Avator360,Nicolet;PHS-3C,12121,5530min,H2SO4pH,,122,22130%H2O2(,),(=500725165),1H2O2,,H2O24%,4%22,2010011391241H2O24%,05%,,11V2O5(NH4)4Ce(NO4)6FeSO41381421451441501,,,,,23,,(2),,75,,,752243,,2h,2h25pH32,pH,pH=5,,pH=52pHpH35791114514714314013926,,,,pH4%752hpH=5,,(4)4(a,b)4,3425cm-1;2920cm-1;1610cm-1~1500cm-1;1460cm-1;1140cm-1(134)201001139134,;,,,,,4,,,;;;,1:,,,2(1):,;,;(2):,,,(3):,;,;,(4):,,,,;(5):,(),,(6):,(7):,(8):,(),,,,,,[1](),2009.(124),2920cm-11460cm-1,;1610cm-1~1500cm-1,,,,,,,,27,3,9%14%;3/%/%3d7d28d913110410114147112107::::=213:800:1118:173,025%3,,,,pH,,,,,,,,[1],,()[J][2],[J],2002,10(2):20-42[3],,,[J](),2007,35(5):117-121