Synthesis of Yellowing Inhibitor Based on the Coumarin Type Fluorescent Brighteners and Its Performance

Employing the Pechmann method,7-hydroxy-4-methyl coumarin fluorescent whitening agent was synthesized from resorcinol and ethyl acetoacetate through dehydration condensation reaction catalyzed by acid.Then,the hindered amine light stabilizer 4-amion-2,2,6,6-tetramentylniperidine,coumarin type fluorescent brighteners and taurine were put into the same molecule,with cyanuric chloride as crosslinking molecule,a new kind of yellowing inhibitor was synthesized.Infrared spectrum was used to characterize the structure of the yellowing inhibitor,and then ultraviolet spectrum and fluorescence spectrum were employed to discuss its yellowing inhibition mechanism.The application effect of the yellowing inhibitor was investigated through the UV accelerated aging test.The results show that the yellowing inhibition effect of the new kind of yellowing inhibitor was better than that of the 7-hydroxy-4-methyl coumarin and 4-amion-2,2,6,6-tetramentylniperidine.