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1、江苏科技大学工学硕士学位论文AbstractWaterbornepolyurethane(WPU)isgreenandenvironmentallyfriendlypolymermaterials.Scholar,expertsandenterprisespayattentiontowaterbornepolyurethane,becauseithasexcellentperformanceandcharacteristicofenvironmentalpollution-free.However,performanceofwaterbornepolyurethanei
2、sbadinwaterresistance,hardness,solidcontentandsoon.Therefore,scientificworkersneedtotrytheirbesteffortstoimproveoreveneliminatethedefectofperformance.Consequently,thestudyofwaterbornepolyurethanehasimportantpracticalsignificance.Theresearchshowsthatreactionmonomersareaddedviatwo-stepmeth
3、od,thefirststepreationtemperatureiscontrolledat85℃,thesecondstepreactiontemperatureiscontrolledat80℃,bothreactiontimeiscontrolled2h,respectively.Theviscosityofprepolymerisadjustedbysolventsofacetoneand1-methyl-2-pyrrolidoneinthereactionprocess.Accordingtotheaboverequirements,wecanobtainw
4、aterbornepolyurethaneemulsionwithgoodresistancetowaterandhighsolidcontent.Theresearchofwaterbornepolyurethaneemulsionmodifiedbyepoxyresinshowsthatthemethodofaddingmonomeristhesameasthebeforemodification.Whenthereactiontemperaturesofthefirstandthesecondstepsareperspectively85℃and75℃,their
5、reactiontimeisrespectively2hand4h,wecanobtainwaterbornepolyurethaneemulsionmodifiedbyepoxyresinwithexcellentperformance.Thereactionmonomerstudyshowsthatwhenmoleratio(R)oftheisocyanategroupofisophoronediisocyanateandthehydroxylgroupofpolypropyleneglycolis(3.8-4.6):1,themassfractionofdihyd
6、roxymethylpropionicacidisbetween5.0%and6.0%,themassfractionof1,4-butanediolisbetween8.0%and9.0%,thecontentofethylenediamineisabout0.004%,waterbornepolyurethaneemoulsionwithwellperformanceisabletobesynthetized.Waterbornepolyurethaneemulsionmodifiedbyonlyoneepoxyresinisabletobesynthetized,
7、whenthecontentsofE-06,E-12,E-20andE-44arebelow2.0%,2.0%,6.0%and8.0%,respectively.WhenthemassfractionsofE-20andE-44arerespectively2.0%and4.0%,theperportyofwaterbornepolyurethaneemulsionmodifiedbythemisbetterthanthatmodifiedbyonlyonekindofepoxyresin.Paticlesizeanalysisshows