Abstract

Preparation of ambient and UV curing non-isocyanate polyurethane (NIPU) coatings has been reported using a series of acetoacetylated non-isocyanate polyurethane (AA-NI-PUPO) oligomers. Synthesized oligomers were characterized using various techniques such as Fourier transform infrared and nuclear magnetic resonance spectroscopy. AA-NI-PUPOs showed significantly lower viscosity compared to their non-acetoacetylated counterparts. Ambient temperature-cured systems were formulated by mixing AA-NI-PUPOs and different primary amine compounds in stoichiometric proportions. Michael addition reaction of acrylates and AA-NI-PUPOs was initiated by UV curing using a photobase generator as the catalyst. NIPU coatings were studied for various thermo-mechanical properties and corrosion resistance. The selected UV-cured and ambient-cured samples showed instant and 1-h tack-free time, respectively. Results revealed that with proper selection of acetoacetylated resin and crosslinker type, coatings with properties comparable to conventional PU coatings could be formulated. Moreover, UV-curable coatings with up to 90 wt% solid could be formulated using conventional monomeric acrylates as a reactive diluent. The study demonstrates the feasibility of formulating solvent-free rapid ambient curing non-isocyanate polyurethane coatings.

Graphic abstract

中文翻译：

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乙酰乙酰化非异氰酸酯聚氨酯的环境温度和UV固化混合涂料

摘要

已经报道了使用一系列乙酰乙酰化的非异氰酸酯聚氨酯（AA-NI-PUPO）低聚物制备环境和紫外线固化的非异氰酸酯聚氨酯（NIPU）涂料。使用多种技术（例如傅立叶变换红外光谱和核磁共振光谱法）对合成的低聚物进行了表征。与未乙酰乙酰化的同类产品相比，AA-NI-PUPO的粘度显着降低。通过以化学计量比例混合AA-NI-PUPO和不同的伯胺化合物来配制环境温度固化的体系。丙烯酸酯和AA-NI-PUPO的迈克尔加成反应是通过使用光碱产生剂作为催化剂的紫外线固化引发的。研究了NIPU涂层的各种热机械性能和耐腐蚀性。所选的UV固化和环境固化样品分别显示了即时和1小时的不粘手时间。结果表明，与乙酰乙酰基化树脂和交联剂类型的适当选择，以与常规的聚氨酯涂料性能的涂料可以配制。而且，可以使用常规的单体丙烯酸酯作为反应性稀释剂来配制具有高达90 wt％的固体含量的UV固化涂料。该研究证明了配制无溶剂的快速环境固化非异氰酸酯聚氨酯涂料的可行性。可以使用常规的单体丙烯酸酯作为反应性稀释剂来配制固体含量高达90％（重量）的UV固化涂料。该研究证明了配制无溶剂的快速环境固化非异氰酸酯聚氨酯涂料的可行性。可以使用常规的单体丙烯酸酯作为反应性稀释剂来配制固体含量高达90％（重量）的UV固化涂料。该研究证明了配制无溶剂的快速环境固化非异氰酸酯聚氨酯涂料的可行性。

图形摘要