Preparation and properties of UV-curable diamine-based polyurethane acrylate hard coatings
Preparation and properties of UV-curable diamine-based polyurethane acrylate hard coatings
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DOI：
10.1016/j.apsusc.2020.147442
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发表时间：
2020-12-15
影响因子：
6.7
通讯作者：
Fahad, Shah
中科院分区：
文献类型：
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作者：
Fu, Junchao;Yu, Haojie;Fahad, Shah
在较温和的反应条件下，合成了三种不同二胺（降冰片烷二甲胺、哌嗪和乙二胺）的聚氨酯丙烯酸酯（普阿）支链化合物。在紫外光照射下制备了基于合成的支链化合物的涂料，并将其用作塑料表面的硬质涂层。用核磁共振氢谱和凝胶渗透色谱对普阿支链化合物的结构进行了表征。从固化行为、动态力学性能、力学性能和涂层表面性能等方面研究了刚性二胺对涂料性能的影响。结果表明，最终的双键转化率与二胺的刚性和所制备的涂层溶液的粘度有关。刚性二胺赋予涂层高的Tg值，并导致相分离，产生粗糙的涂层表面。拉伸试验表明，交联度最高、刚性适中的二元胺涂层具有优异的力学性能，拉伸强度为20.7MPa，断裂伸长率为6.8%。制备的PUA-PZ涂层的铅笔硬度可达5 H，高于市售普阿-6树脂，且涂层具有良好的附着力和柔韧性，可作为PC表面的防护涂层。此外，所有涂层都表现出良好的热性能。
Three polyurethane acrylate (PUA) branched compounds with different diamines (Norbornane dimethylamine, piperazine and ethylenediamine) were synthesized under the facile reaction condition. Coatings based on synthesized branched compounds were prepared under UV-irradiation, and used as hard coatings to protect the plastic surface. The structures of PUA branched compounds were characterised by proton nuclear magnetic resonance and gel permeation chromatography. The effect of rigid diamines on the properties of coatings was investigated regarding to the curing behaviour, dynamic mechanical property, mechanical property and coating surface property. The results indicate that the final double bond conversion is associated with the rigidity of the diamines and the viscosity of the prepared coating solution. The rigid diamine endows the coating with high T-g value, and leads to phase separation that creates rough coating surface. The tensile test shows that the coating with highest crosslinking and moderately rigid diamine possesses excellent mechanical property with 20.7 MPa in tensile strength and 6.8% in elongation at break. The pencil hardness of the prepared PUA-PZ coating can reach to 5H that is higher than the commercially available resin PUA-6, and this coating also shows good adhesion and flexibility, which has potential to be applied as protective coating to protect PC surface well. Moreover, all coatings exhibit good thermal properties.