聚羧酸高性能減水劑及其應(yīng)用（polycarboxylate high-performance water reducing agent and its application）

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1、聚羧酸高性能減水劑及其應(yīng)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