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1、Polycarboxylatehigh-performancewaterreducingagentanditsapplication（聚羧酸高性能减水剂及其应用）Polycarboxylicacidhighperformancewaterreducingagentanditsapplication________________________________________Chineseconcretemesh[2005-3-19]addedtomybusinesstreasurePolycarboxylatesuperplasticizerhasdevelopedrapidlyinre
2、centyearsbecauseofitssuperiorperformanceandpollution-freeproduction.EspeciallyinJapan,theuseratioofpolycarboxylateandnaphthalenehasexceeded7:3.Polycarboxylicacidfromthemolecularstructure,functionprincipleandbehaviorinconcreteandtraditionalwaterreducerhastheverybigdifference,therefore,thecorrectund
3、erstandingandrationaluseisanimportantlinktopromotetheapplicationofpolycarboxylatesuperplasticizer.TheauthorhasaccumulatedthreeyearsexperienceintheproductionandapplicationofLEX-9seriespolycarboxylatesuperplasticizer,hopingtobenefitthedevelopmentofthisnewwaterreducingagentinourcountry.Polycarboxylic
4、acidwaterreducingagentPolycarboxylicwaterreducingagentisakindofsurfactantwithmolecularstructureascarboxylgraftcopolymer.Ithashighandrelativelylastingwaterreducingeffectinconcrete.Inthedomesticandforeignliteraturerefertodozensofkindsofsurfaceactiveagenthasthecharacteristicsofmolecularstructure,incl
5、uding:maleicacid(ester),graftcopolymerofacrylategraftcopolymer,containingendsulfonicacidgraftcopolymer,unsaturatedpolyethercopolymeretc..Allthesecopolymersform"comblike"or"dendritic"branchedstructures,thedifferenceisthelength,rigidity,morphologyandpolarityofthemainchainandthebranchedchain.Naphthal
6、enewaterreducingagentisatypicalionicdispersant.Onceitentersthecementwatersystem,theadsorptionlayer(doublelayer)isformedimmediately,thusincreasingtheelectrostaticrepulsionoftheparticlesurfaceandachievingthedispersioneffect.Polycarboxylicacidintothebehaviorofcementwatersystemismuchmorecomplex,first,
7、itsmainchainandbranchedchainhaveselectiveadsorption;second,differentgroupsmayformdifferentkindsofelectricdoublelayerparticlerepulsion;third,afteradsorptionontheparticlesurfacetoformmolecularlayerthree-dimensional
