Synthesis and application of amphoteric acrylate quaternary ammonium salt fluorescent brightener
A fluorescent whitening agent and acrylate technology, which is applied in the field of fluorescent whitening agents, can solve the problems that fluorescent whitening agent products cannot meet the needs of industrial development, decrease in fluorescence and whitening efficiency, and poor light resistance, and achieve bonding firmness High, whitening paper, good weather resistance
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Embodiment 1
[0030] Add 20.5mmol cyanuric chloride to 250mL ice water and place in ice bath. Then 10mmol 4,4'-diaminostilbene-2,2'-disulfonic acid (DSD acid) and 200mL distilled water, Na 2 CO 3 The mixture was stirred at 0°C and reacted for 2h. Add 20mmol aniline, raise the temperature to 35°C, add dropwise 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 6, and the temperature was controlled for 6 hours. Then dropwise add 22mmol of diethylamino ethyl methacrylate and 11mL of acetone mixture, raise the temperature to 90°C, add dropwise 10% Na 2 CO 3 The aqueous solution maintains the pH of the system at 9, and the temperature is controlled for 10 hours. The endpoint of the three-step reaction was monitored by thin-layer chromatography. Cool to room temperature, add 60 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain an amphoteric acrylate quaternary ammonium salt fluorescent whitening agent with a yield of 88.5%.
Embodiment 2
[0032] Add 20.5mmol cyanuric chloride to 250mL ice water and place in ice bath. Then 10mmol 4,4'-diaminostilbene-2,2'-disulfonic acid (DSD acid) and 200mL distilled water, Na 2 CO 3 The mixture was stirred at 3°C for 1.5h. Add 20mmol aniline, raise the temperature to 40°C, add dropwise 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 7, and the temperature was controlled for 5 hours. Then dropwise add 22mmol of diethylamino ethyl methacrylate and 11mL of acetone mixture, raise the temperature to 80°C, add dropwise 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 8, and the temperature was controlled for 9 hours. The endpoint of the three-step reaction was monitored by thin-layer chromatography. Cool to room temperature, add 60 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain an amphoteric acrylate quaternary ammonium fluorescent whitening agent with a yield of 85%.
Embodiment 3
[0034] Add 20.5mmol cyanuric chloride to 250mL ice water and place in ice bath. Then 10mmol 4,4'-diaminostilbene-2,2'-disulfonic acid (DSD acid) and 200mL distilled water, Na 2 CO 3 The mixture was stirred and reacted at 5°C for 2h. Add 20mmol aniline, raise the temperature to 37°C, add dropwise 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 6.5, and the temperature was controlled for 5.5 hours. Then dropwise add 22mmol of diethylamino ethyl methacrylate and 11mL of acetone mixture, raise the temperature to 85°C, add dropwise 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 8.5, and the temperature was controlled for 10 hours. The endpoint of the three-step reaction was monitored by thin-layer chromatography. Cool to room temperature, add 60g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain an amphoteric acrylate quaternary ammonium salt fluorescent whitening agent with a yield of 87%.
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