聚氨酯合成工艺.ppt

聚氨酯合成工艺.ppt

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时间:2020-01-23

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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

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