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A new tri-functional azetidine compound for self-curing aqueous-based PU system

机译:用于自固化水性聚氨酯体系的新型三官能氮杂环丁烷化合物

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摘要

A mono-azetidine compound had been demonstrating a ring opening reaction with carboxylic acid (e.g., trimethylacetic acid, TMAA) and that resulted in an amino ester bond formation at ambient temperature. A triazetidine compound (trimethylolpropane tris(1-azetidinyl)propionate, TMPTA-AZT) was obtained via Michael addition of azetidine (AZT) to trimethylolpropane triacrylate (TMPTA). The carboxylic groups of anionic aqueous-based polyurethanes (PU) served as internal emulsifier, which stabilized PU dispersion and also served as PU curing sites. The triazetidine compound (TMPTA-AZT) was introduced into anionic aqueous-based PU dispersion as a new latent curing agent and that mixture became a single-component self-curable aqueous PU system. A crosslinked PU film was obtained from this PU system on drying at ambient temperature. The final polymer performance properties demonstrated the crosslinking behaviors of this new curing agent, TMPTA-AZT, with carboxylic ion-containing aqueous-based PU resins.
机译:单氮杂环丁烷化合物已经证明与羧酸(例如三甲基乙酸,TMAA)发生开环反应,并导致在环境温度下形成氨基酯键。三氮杂环丁烷化合物(三羟甲基丙烷三(1-氮杂环丁烷基)丙酸酯,TMPTA-AZT)是通过将氮杂环丁烷(AZT)迈克尔加成到三羟甲基丙烷三丙烯酸酯(TMPTA)上而获得的。阴离子水基聚氨酯(PU)的羧基用作内部乳化剂,可稳定PU分散体,也可用作PU固化位点。将三氮杂环丁烷化合物(TMPTA-AZT)作为一种新型的潜在固化剂引入阴离子水基PU分散体中,该混合物成为单组分自固化水性PU体系。在环境温度下干燥时,从该PU体系获得交联的PU膜。最终的聚合物性能证明了这种新型固化剂TMPTA-AZT与含羧酸离子的水性PU树脂的交联行为。

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