Abstract:

Considering the weak acid resistivity and solubility of the anionic FWA in acidic conditions, the triazinyl aminostilbene fluorescent whitening agents were synthesized through three-step condensation reactions using 4-aminobenzoic acid with cyanuric chloride (CC), 4,4′-diamino stilbene2,2′-disulfonic acid (DSD acid) and aliphatic amines as the basic materials. Triethanolamine, triethylamine, N, N-dimethyl ethanolamine and Nmethyldiethanolamine were used to synthesize four new types of amphoteric fluorescent by  the third step condensation reaction. The structural characterization of the synthesized amphoteric fluorescent whitening agents (FWA) was given. The fluorescence emission properties and the dyeing properties of the amphoteric FWA were studied by comparing with those of anionic FWA. The results showed that the fluorescence emission efficiency was lower than that of anionic FWA, and  the amphoteric FWA was more suitable for dyeing in acidic conditions.

Key words:  fluorescent whitening agent; , quinine bisulfate, fluorescence emission property, dyeing property