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1、OverviewofBayerWaterborneTechnology-PUD/2KH2O水性聚氨酯體系WaterbornePUSystems聚氨酯分散體PUD（Bayhydrol?）多應(yīng)用于單組分體系特殊情況下也應(yīng)用于類雙組分體系可與丙稀酸乳液拼用水性聚氨酯多羥基化合物（Bayhydrol?）-OHFunctional羥基應(yīng)用于雙組分體系水溶性聚異氰酸酯（Bayhydur?）含-NCO端基改性后可在水中分散應(yīng)用于雙組分體系水性雙組份聚氨酯涂料Bayhydur?/Bayhydrol?聚氨酯分散體PUD聚氨酯分散
2、體PUD-PolyurethaneDispersion完全反應(yīng)的聚氨酯聚合物分散在水相中；不含活性的-OH基和-NCO基；成膜機(jī)理不是由于-OH基和-NCO基的反應(yīng)固化，而是由于水和助溶劑的揮發(fā)，聚合物微粒聚結(jié)成膜。水介質(zhì)中的離散顆粒DiscreteParticlesinAqueousMedia基片上顆粒沉積DepositionofParticlesonSubstrate聯(lián)結(jié)成連續(xù)的膜CoalescenceintoContinuousFilmCoalescence聚合物微粒聚結(jié)成膜DispersionConce
3、ntrationCoalescenceMaturation聚氨酯分散體化學(xué)中重要的反應(yīng)反應(yīng)速率：胺>醇/水>酸Reactionrates:amine>alcohol/water>acidComponentsofaPUD成份Isocyanates異氰酸脂Polyolsandglycols多醇Aminechainextenders氨基鏈增長(zhǎng)劑Hydrophilicgroups親水基團(tuán)Neutralizers中和劑DiisocyanatesCommonlyUsedinPUDsPUD中常用的異氰酸脂HDI-Hexame
4、thyleneDiisocyanateIPDI-IsophoroneDiisocyanateDesmodurW-4,4’-DicyclohexylmethaneDiisocyanateOCNNCOOCNNCONCOOCNPrepolymerMixingMethods預(yù)聚物混合法2nHOOH+nHOCH2CCH2OHCH3CO2H+4nOCNRNCOOCNRNHCOORNHCONHCOCH2CCH2OCNHROCNHOOCH3CO2HOOOCNHRNCOOOCNRNHCOOOCNHRNCOORNHCONHCOCH
5、2CCH2OCNHROCNHOOCH3CO2OOHNR3NR3HydrophilicIsocyanateTerminatedPrepolymer1.Water2.H2NR'NH2OCNHRNHCOCH2CCH2OCNHRNHCNHR'NHCNHRNHCOCH3CO2OOOOOOHNR3AqueousDispersionofPolyurethane-Urea預(yù)聚物混合法Advantages優(yōu)點(diǎn)Easiestprocesstoperform容易操作的程序Broadrangeofchemistriesaccessib
6、le可容廣范圍的化學(xué)反應(yīng)Disadvantages缺點(diǎn)Highviscosityofprepolymerrequiresco-solvent高粘的預(yù)聚物需用溶劑Useofaromaticdi-isocyanates不可用芳香族的異氰酸脂Limitonneutralizingamines中和用的氨基試劑有限Reproducibility重復(fù)性差A(yù)cetoneMethod丙酮法nHOOH+2nOCNRNCOOCNRNHCOOOCNHORNCOOCHNORNHCONHR'NCHNRNHCOOOR'OCNHRNHCOO
7、OSO3NaWaterAcetoneH2NR'NHR'SO3NaDispersionofPolyurethane-UreainWater/SolventAcetoneRemovalAqueousDispersionofPolyurethane-UreaAcetoneProcess丙酮工藝Useacetoneasasolventforpolymerization利用丙酮為聚合反應(yīng)溶劑來(lái)Buildupprepolymer生成預(yù)聚物Chainextend增鏈Addinneutralizingagent加入中和劑Dis
8、perseinwater分散于水中Distilloffacetone將丙酮蒸出Allowsfordevelopmentofproductswithcontrolledarchitecture允許開發(fā)預(yù)定分子結(jié)構(gòu)的產(chǎn)品Productscanbemadewithnosolvent產(chǎn)品內(nèi)無(wú)溶劑StableDispersedProductsParticlesShouldRemainDiscre
