资源描述：
《聚合工艺对聚羧酸高性能的影响》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、聚合工艺对聚羧酸高性能的影响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
