拜耳水性分散体资料

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1、OverviewofBayerWaterborneTechnology-PUD/2KH2O水性聚氨酯体系WaterbornePUSystems聚氨酯分散体PUD（Bayhydrol®）多应用于单组分体系特殊情况下也应用于类双组分体系可与丙稀酸乳液拼用水性聚氨酯多羟基化合物（Bayhydrol®）-OHFunctional羟基应用于双组分体系水溶性聚异氰酸酯（Bayhydur®）含-NCO端基改性后可在水中分散应用于双组分体系水性双组份聚氨酯涂料Bayhydur®/Bayhydrol®聚氨酯分散体PUD聚氨酯分散

2、体PUD-PolyurethaneDispersion完全反应的聚氨酯聚合物分散在水相中；不含活性的-OH基和-NCO基；成膜机理不是由于-OH基和-NCO基的反应固化，而是由于水和助溶剂的挥发，聚合物微粒聚结成膜。水介质中的离散颗粒DiscreteParticlesinAqueousMedia基片上颗粒沉积DepositionofParticlesonSubstrate联结成连续的膜CoalescenceintoContinuousFilmCoalescence聚合物微粒聚结成膜DispersionConce

3、ntrationCoalescenceMaturation聚氨酯分散体化学中重要的反应反应速率：胺>醇/水>酸Reactionrates:amine>alcohol/water>acidComponentsofaPUD成份Isocyanates异氰酸脂Polyolsandglycols多醇Aminechainextenders氨基链增长剂Hydrophilicgroups亲水基团Neutralizers中和剂DiisocyanatesCommonlyUsedinPUDsPUD中常用的异氰酸脂HDI-Hexame

4、thyleneDiisocyanateIPDI-IsophoroneDiisocyanateDesmodurW-4,4’-DicyclohexylmethaneDiisocyanateOCNNCOOCNNCONCOOCNPrepolymerMixingMethods预聚物混合法2nHOOH+nHOCH2CCH2OHCH3CO2H+4nOCNRNCOOCNRNHCOORNHCONHCOCH2CCH2OCNHROCNHOOCH3CO2HOOOCNHRNCOOOCNRNHCOOOCNHRNCOORNHCONHCOCH

5、2CCH2OCNHROCNHOOCH3CO2OOHNR3NR3HydrophilicIsocyanateTerminatedPrepolymer1.Water2.H2NR'NH2OCNHRNHCOCH2CCH2OCNHRNHCNHR'NHCNHRNHCOCH3CO2OOOOOOHNR3AqueousDispersionofPolyurethane-Urea预聚物混合法Advantages优点Easiestprocesstoperform容易操作的程序Broadrangeofchemistriesaccessib

6、le可容广范围的化学反应Disadvantages缺点Highviscosityofprepolymerrequiresco-solvent高粘的预聚物需用溶剂Useofaromaticdi-isocyanates不可用芳香族的异氰酸脂Limitonneutralizingamines中和用的氨基试剂有限Reproducibility重复性差AcetoneMethod丙酮法nHOOH+2nOCNRNCOOCNRNHCOOOCNHORNCOOCHNORNHCONHR'NCHNRNHCOOOR'OCNHRNHCOO

7、OSO3NaWaterAcetoneH2NR'NHR'SO3NaDispersionofPolyurethane-UreainWater/SolventAcetoneRemovalAqueousDispersionofPolyurethane-UreaAcetoneProcess丙酮工艺Useacetoneasasolventforpolymerization利用丙酮为聚合反应溶剂来Buildupprepolymer生成预聚物Chainextend增链Addinneutralizingagent加入中和剂Dis

8、perseinwater分散于水中Distilloffacetone将丙酮蒸出Allowsfordevelopmentofproductswithcontrolledarchitecture允许开发预定分子结构的产品Productscanbemadewithnosolvent产品内无溶剂StableDispersedProductsParticlesShouldRemainDiscre