Storage stable, one package, heat curable poly urea/urethane coating compositions
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0150330A2
公开(公告)日:1985-08-07
New and improved storage stable, one package, heat-curable poly urea/urethane coating compositions are disclosed which comprise:
(a) a mixture or prepolymer of
(i) a poly aliphatic isocyanate compound of the formula:
wherein R and R' are each, independently, hydrogen, alkyl or substituted alkyl and X is a bridging means selected from divalent aliphatic, cycloaliphatic, or aromatic groups, or a polymeric adduct of said aliphatic isocyanate compound possessing poly aliphatic isocyanate functionality; and
(ii) an approximately stoichiometric amount of at least one monomeric or polymeric compound containing a plurality of isocyanate reactive hydrogens; and
(b) a minor effective amount of a polymerization calalyst.
The compositions cure when heated to above about 100°C to form coatings which exhibit good abrasion resistance, solvent resistance, weather resistance and good adhesion to a wide variety of substrates. The coating compositions are stable upon storage for several months and have useful coating lives in the presence of atmospheric moisture of up to several days.
In a preferred embodiment the new and improved poly urea/urethane coating compositions comprises a prepolymer solution containing a prepolymer derived from a,a,a',a'-tetramethylxylyene diisocyanate and 9-amino-10-hydroxystearylamine having a solids content of from about 30% by weight to about 80% by weight and an isocyanate content of from about 2% by weight to about 10% by weight, based on the total weight of the solution, and a minor effective amount of a dibutyltin dilaurate catalyst.
本发明公开了新型和改进的贮存稳定、单包装、热固化聚脲/聚氨酯涂料组合物,其中包括
(a) 以下物质的混合物或预聚物
(i) 式中的多脂肪族异氰酸酯化合物:
其中 R 和 R'各自独立地是氢、烷基或取代烷基,X 是选自二价脂肪族、环脂族或芳香族基团的桥接手段,或具有多脂 族异氰酸酯官能团的所述脂肪族异氰酸酯化合物的聚合物加合物;和
(ii) 约为等当量的含有多个异氰酸酯活性氢的至少一种单体或聚合化合物; 以及
(b) 少量有效的聚合催化剂。
这些组合物在加热至约 100°C 以上时固化,形成具有良好耐磨性、耐溶剂性、耐候性和与各种基材良好粘附性的涂层。涂层组合物在储存数月后保持稳定,在大气湿度存在的情况下,涂层寿命可达数天。
在一个优选的实施方案中,新型改进的聚脲/聚氨酯涂料组合物包括一种预聚物溶液,其中含有一种由 a、a、a'、a'-四甲基乙烯二异氰酸酯和 9-氨基-10-羟基硬脂酰胺的预聚物,其固体含量为约 30%(重量)至约 80%(重量),异氰酸酯含量为约 2%(重量)至约 10%(重量)(基于溶液总重量),以及少量有效的二月桂酸二丁基锡催化剂。