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    • 1. 发明授权
    • Two component waterborne crosslinkable polyurethane/acrylate-hybrid
systems
    • 双组分水性交联聚氨酯/丙烯酸酯 - 混合体系
    • US5594065A
    • 1997-01-14
    • US436534
    • 1995-05-09
    • Chao-Fong TienCharles R. HegedusThomas M. SantosussoJeanine M. SnyderLisa A. Mercando
    • Chao-Fong TienCharles R. HegedusThomas M. SantosussoJeanine M. SnyderLisa A. Mercando
    • C08G18/00C08G18/08C08G18/10C08G18/12C08G18/32C08G18/67C09D175/00C09D175/04C09D175/16C08L75/04C08F8/32
    • C09D175/16C08G18/0823C08G18/10C08G18/12C08G18/672
    • An improved two component coating system based upon crosslinkable hydroxy containing polymers and a polyisocyanate crosslinker. The improvement resides in the utilization of a water-borne hydroxy-terminated polyurethane prepolymer/acrylate hybrid, preferably a hydroxy acrylate hybrid, in combination with a water-dispersible polyisocyanate. The two component coating composition can be prepared by:a) forming a carboxy-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer,b) adding at least one acrylic monomer which contains a hydroxy-group to the carboxy-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer to form a prepolymer/monomer mixture,c) adding an alkanolamine to the prepolymer/monomer mixture to introduce hydroxy functionality into the polyurethane prepolymer,d) dispersing the prepolymer/monomer mixture in water,e) adding an oil-soluble free radical initiator and a hydroxy-containing chain extender to the aqueous dispersion,f) polymerizing the acrylic monomers and completing the chain extension of the prepolymer by heating the aqueous dispersion, andg) mixing the resulting hybrid dispersion with a water-dispersible polyisocyanate.
    • 基于可交联羟基聚合物和多异氰酸酯交联剂的改进的双组分涂料体系。 改进在于水性羟基封端的聚氨酯预聚物/丙烯酸酯杂化物,优选羟丙基酯杂化物与水分散性多异氰酸酯的组合的利用。 双组分涂料组合物可以通过以下方法制备:a)形成含羧基的水分散性异氰酸酯封端的聚氨酯预聚物,b)将至少一种含有羟基的丙烯酸单体加入含羧基的水溶性聚氨酯预聚物中, 可分散的异氰酸酯封端的聚氨酯预聚物以形成预聚物/单体混合物,c)将烷醇胺加入到预聚物/单体混合物中以将羟基官能团引入聚氨酯预聚物中,d)将预聚物/单体混合物分散在水中,e) 油溶性自由基引发剂和含羟基的扩链剂,f)聚合丙烯酸单体并通过加热水分散体完成预聚物的链延伸,和g)将得到的混合分散体与水溶性自由基引发剂 可分散多异氰酸酯。