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1、聚合工藝對聚羧酸高性能的影響Inrecentyears,large-scaleengineeringconstructionsuchasBridges,highways,high-risebuildingmoreandmorehightotherequirementofconcrete,thegrowingdemandforhighperformanceconcrete.Thepolycarboxylicacidserieshighperformancedewateringagentisanimportantpartofhighperformanceconcrete
2、andisbecomingmoreandmoreconcerned.Seriesofpoly(carboxylicacidhighperformancewaterreducingagentispolymergraftedcopolymer,thecurrentdomesticmanufacturerssprangup,anditsproductionprocess,rawmaterialtypeandforeignlargedifference,thequalityoftheproductalsohasalargegap.Therefore,inthispaper,
3、byanalyzingthedomesticandforeignpatents,thepolymerizationprocesshascarriedonthesystemdesignandexperiment,thedifferentsynthesisprocesseffectonthepropertiesofpoly(carboxylicacidwaterreducingagentarediscussedinthispaper.Atpresent,themainmonomerofthesynthesispolycarboxylicacidseriesofhighp
4、erformancedewateringagentismethoxypolyethyleneglycol(MPEG)andallylpolyethyleneglycol(XPEG)etc.Synthesisprocesshasmanypatentsforitsproductsbothathomeandabroadrelatedintroduction[1-2],synthesismethodsaboutthefollowingkinds:(1)one-timechargingmethod:toacertainproportionofthereactionofmono
5、merandinitiatorone-timejoinreactor,heatinguptothespecifiedtemperaturethermalreactionafteracertaintime,polycarboxylicacidneutralizationreactantobtainedwaterreducingagentproducts;(2)dropsaddition:mixreactionmonomermixturesolution,mixturesolution,atthesametimetheinitiatorwereinsertedinthe
6、droppingfunnelaccordingtocertainspeeddropstojoinacertainamountofwaterinthereactor,addfinished,thermalreactiontime,temperatureandgetwaterreducingagentproducts;(3)thereactionmonomerisaddedatonce,theinitiatorsolutionisaddedoraddedinbatches,thetemperatureisheateduptoacertaintemperatureandt
7、heheatpreservationreactionisacertaintime,andtheproductisneutralized.Inaddition,therearesomemethodisthemodifiedtheaboveseveralmethods,suchasreactionmonomers,transferagentandinitiatoraddmethodrespectively,isactuallyaddway.MPEGmonomersbeforepolymerizationesterificationisrequiredtoinclud
