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1、聚羧酸高性能减水剂及其应用(Polycarboxylatehigh-performancewaterreducingagentanditsapplication)Polycarboxylicacidhighperformancewaterreducingagentanditsapplication________________________________________Chineseconcretemesh[2005-3-19]addedtomybusinesstreasurePolycarboxylatesuperpl
2、asticizerhasdevelopedrapidlyinrecentyearsbecauseofitssuperiorperformanceandpollution-freeproduction.EspeciallyinJapan,theuseratioofpolycarboxylateandnaphthalenehasexceeded7:3.Polycarboxylicacidfromthemolecularstructure,functionprincipleandbehaviorinconcreteandtradit
3、ionalwaterreducerhastheverybigdifference,therefore,thecorrectunderstandingandrationaluseisanimportantlinktopromotetheapplicationofpolycarboxylatesuperplasticizer.TheauthorhasaccumulatedthreeyearsexperienceintheproductionandapplicationofLEX-9seriespolycarboxylatesupe
4、rplasticizer,hopingtobenefitthedevelopmentofthisnewwaterreducingagentinourcountry.PolycarboxylicacidwaterreducingagentPolycarboxylicwaterreducingagentisakindofsurfactantwithmolecularstructureascarboxylgraftcopolymer.Ithashighandrelativelylastingwaterreducingeffectin
5、concrete.Inthedomesticandforeignliteraturerefertodozensofkindsofsurfaceactiveagenthasthecharacteristicsofmolecularstructure,including:maleicacid(ester),graftcopolymerofacrylategraftcopolymer,containingendsulfonicacidgraftcopolymer,unsaturatedpolyethercopolymeretc..A
6、llthesecopolymersform"comblike"or"dendritic"branchedstructures,thedifferenceisthelength,rigidity,morphologyandpolarityofthemainchainandthebranchedchain.Naphthalenewaterreducingagentisatypicalionicdispersant.Onceitentersthecementwatersystem,theadsorptionlayer(doublel
7、ayer)isformedimmediately,thusincreasingtheelectrostaticrepulsionoftheparticlesurfaceandachievingthedispersioneffect.Polycarboxylicacidintothebehaviorofcementwatersystemismuchmorecomplex,first,itsmainchainandbranchedchainhaveselectiveadsorption;second,differentgroups
8、mayformdifferentkindsofelectricdoublelayerparticlerepulsion;third,afteradsorptionontheparticlesurfacetoformmolecularlayerthree-dimensional