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1、PuSyntheticProcessPuIntroductionPuSyntheticPuVarietyClassificationApplicationsANDApplicationsPuIntroductionPuwholecalledpolyethylenecarbamate,iscontainedinthemolecularstructureoftheunit—NHCOO—theunitbyhigh-molecularcompounds,andhydroxylreactionsystem,reactiveisasfol
2、lows:—N=C=O+HOˉ→—NH-COOˉInthe1970s,GermanytoBayerfirstsynthesizedPU.In1950,PUastextilefinishingagentinEurope,butmostlyforsolventproductsusedindrycoating.Inthe1960s,duetothepeopleenvironmentalprotectionconsciousnessenhancementandtheenvironmentalprotectionlawsandregul
3、ations,PUcoatingsystem.Since1970's,PUPUfabricrapiddevelopment,hasbeenwidelyused.Sincethe1980s,theresearchandapplicationofPUtechnicalbreakthroughprogressappeared.ComparedwiththeforeignanddomestictextilefinishingagentonPUstudylater.PuSyntheticPubytwophasetocomposition
4、,includingsoftandhardandsoftsectionislongchainpolyolshardsegmentisbyisocyanateandextenderchainagent.PolyurethaneisbyisocyanateandpolyolsasbyMrReaction,thenwithextenderchainreaction.Sulfideagent,Sometimesuse"one-step"forsynthesisofpolyurethanetoreducecostandincreaset
5、hereactionspeed.Theso-called"one-step"willbepolyols,isocyanateandextenderchainreaction,stepwithpolyurethane.Forsynthesisofpolyurethane,everyoneknowsthatalltheingredients,Dupontcompanyeasilyabsorbingpolyetherinshippingduringdrying,manufacturercaneffectivelyusedirectl
6、y.Duringoperation,sooftenaccidentalintowatertodegas.Smallsampleeasilyabsorbacertainamountofmoisture,thereforeissynthesizedinthelabbeforeanyisocyanatereactionshoulddegas.Canbemixedgasoffintotheair.Belowareadoptedintherecipeordrydegas.Terathanecanbesoftmaterialandgene
7、raldiisocyanatereaction,globalmostcommonlydiisocyanateas454'-ErBenJimethanediisocyanate(MDI)andtoluenediisocyanate(TDI),(2,4-diflooronitrohenzene,lysineTDIisomersinvariousmixingratioofmixture).Terathanecanalsowithspecialdiisocyanatereaction,suchasPPDI,inordertoimpro
8、vetheperformanceandabrasionresistance,temperatureflexingfatigueproperties.Foraliphaticdiisocyanateultravioletlightresistance,seepart.Other
