新型三嗪紫外吸收剂的合成及其在涂料中的应用

摘要

合成了一种新型三嗪类紫外吸收剂—-2-[(2-羟基-9-正丙基)咔唑基]-4,6-二[(9-正丙基)咔唑基]-1,3,5-三嗪(HPCT).采用核磁共振谱和紫外光谱对该化合物进行了表征,用热重分析、扫描电镜和相差显微镜研究了其对丙烯酸酯涂料热稳定性、相容性和紫外吸收性能的影响,并通过一定时间的紫外老化后涂层力学性能的变化来表征其耐紫外老化的能力.结果表明,通过格氏反应合成的目标产物,其在260～400nm波长范围呈现出1个较强的吸收带;与丙烯酸酯涂料混合表现出典型的“海-岛”两相结构.HPCT用量为3％时即可显著增强涂层的热稳定性、紫外屏蔽效果和耐紫外老化性能.%A novel triazine UV-absorber i.e.2-[(2-hydroxy-9-n-propyl)carbazolyl]-4,6-bis[(9-n-propyl)carbazolyl]1,3,5-triazine (HPCT) was synthesized and characterized by nuclear magnetic resonance spectroscopy and ultraviolet spectroscopy.Its effect on the thermal stability,compatibility and UV absorption property of acrylate coatings was studied by thermogravimetric analyzer,scanning electron microscope and phase contrast microscope.Its anti-UV aging property was evaluated through the variation of mechanical properties after UV aging for a period of time.The results showed that the target product synthesized through Grignard reaction exhibits a strong absorption band in the 260-400 nm wavelength range and a typical "sea-island" two-phase structure after mixing with acrylate coating.The use of 3％ HPCT can improve the coating's thermal stability,UV shielding effect and anti-UV aging property remarkably.