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1、聚合工艺对聚羧酸高性能的影响（Effectofpolymerizationprocessonthehighperformanceofpolycarboxylate）Inrecentyears,largeengineeringbuildings,suchasbridges,highwaysandhigh-risebuildings,arebecomingmoreandmoredemandingforconcrete,andthedemandforhigh-performanceconcreteisincrea
2、sing.Polycarboxylicseriesofhighperformancewaterreducerasanimportantpartofhighperformanceconcrete,hasbeenpaidmoreandmoreattention;polycarboxylatesuperplasticizerisapolymergraftcopolymer,thecurrentdomesticmanufacturerssuchasbambooshootsafteraspringrainlikeap
3、pearance,itsproductionprocess,rawmaterialsandforeignlargedifference,thequalityoftheproductshavealargergap.Therefore,byanalyzingthepatentsathomeandabroad,thesystemdesignandexperimentofpolymerizationprocessarecarriedout,andtheinfluenceofdifferentsyntheticpro
4、cessesontheperformanceofpolycarboxylatesuperplasticizerisdiscussed.Atpresent,themainmacromonomermaterialsforthesynthesisofpolycarboxylateserieshigh-performancewaterreducingagentsaremethoxypolyethyleneglycol(MPEG)andallylpolyethyleneglycol(XPEG).Thereareman
5、ydomesticandforeignpatentsrelatedtointroduce[1-2]tothesynthesisprocessofitsproducts,probablysyntheticmethodsareasfollows:(1)one-timefeedingmethod:theratioofreactionmonomerandinitiatorisaddedonereactor,heatingtoacertainperiodoftimeaftertheprovisionsoftherea
6、ctiontemperature,neutralizationreactionbypolycarboxylatesuperplasticizerproducts;(2)dropping:thereactionmixedsolutionofmonomer,andinitiatortopreparesolutionandreactorarerespectivelyarrangedinthedroppingfunnelatacertainspeeddropstoaddacertainamountofwater,a
7、fterfinishingdropping,temperaturereactiontime,temperatureandgetwaterreducerproducts(3;)reactivemonomerisaddedone,initiatorsolutionaddedoraddedinbatches,heatingtoacertaintemperatureandreactiontime,andgettheproduct.Inaddition,therearesomewaystoimprovetheabov
8、emethods,suchasdroppingthereactionmonomer,thetransferagentandtheinitiatorseparately,infact,thewayofdropping.TheneedforesterificationofMPEGmonomerwhichcontainsunsaturateddoublebondsinpolymerization,throughradi
