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1、美國氣體催化劑大全（UnitedStatesgascatalysts）PolyurethanecatalystDaquan2011-05-2419:11AmericangasproductnumbercompanyproductcodeproductintroductionaminecatalystDABCO,33LVR,A-3333%,three,two,ethylene,twoamines,propyleneglycolsolutions,industrialstandardproducts.Three,thechemicalstructure
2、ofethylenetwoaminesisveryunique,isacagelikecompound,twonitrogenatomsconnectthreesubethyl.Thestructureofthismoleculeisverydenseandsymmetrical.ItcanbeseenfromthestructuralformulathatthereisnostericallyhinderedsubstituentontheNatom,andthatonepairofemptyelectronsiseasytoapproach.I
3、nthefoamingsystem,oncetheurethanebondisgenerated,itwilldissociateandbeconducivetofurthercatalysis.Forthisreason,althoughthreeethylenetwoaminesarenotstrongbases,theyexhibitveryhighcatalyticactivityforisocyanategroupsandreactivehydrogencompounds.Itisastronggelcatalyst.Othercompa
4、niesofthesameproductbrand,theUnitedStatesGE:NIAXCatalystA-33;JapaneseDongCao:TEDAL33;domesticmanufacturersgenerallyuseA-33asaproductname.DABCOR10271027modifiedthreeethylene,twoamines,usedinmonoethanolpolyesterandpolyethershoestocksystem,canadjustthefiberandreleasetime.DABCO102
5、81028modifiedthreeethylenetwoamine,usedin1,4butanediolpolyesterandpolyethersolesolutionsystem,canadjustthefiberandreleasetime.DABCO81548154delayedthreeethylenetwoaminetypecatalystcanimprovefoamflowability.Adelayofthreeethyleneandtwoaminescanimprovefoamflow.Theformulationtakesa
6、lagstartingtime,ortheformulationrequiresalargeamountofconventionalcatalysttoachievefullfoamcuring.Thecatalyticcenterofthecatalystischemicallyinhibitedbyanaminoacidsaltthatcontainsavarietyofdifferentcombinationsofammoniumsaltsandthusprovidesregularfoamingcurves.Moreover,thecorr
7、osionofthisproductismuchlowerthanthatofotherdelayedactioncatalysts.Application:Thisproductissuitableforallconvenientinjectionmolding,moldclosing,andimprovedflowmoldingfoam.Theonlyaminogelcatalyst(orY-33catalystshared)inthisformulation.Therefore,thecatalysiscangreatlyimprovethe
8、processingefficiencyofthewholemoldingfoamprocess.Inthemolding
