Pyrimidine-myristyl quaternary ammonium salt fluorescent whitening agent as well as preparation method and application thereof
A technology of fluorescent whitening agent and tetradecyl, which is applied in the field of fluorescent whitening agent, can solve the problem of lack of fluorescent whitening agent of heavy calcium carbonate powder, etc., achieve strong ultraviolet absorption performance, simple synthesis method, combined The effect of high firmness
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Embodiment 1
[0028] Add 21mmol of 2,4-dichloropyrimidine to 22mL of dimethylformamide and stir at 25°C. Then dropwise add a mixture of 10mmol 4,4'-diaminostilbene-2,2'-disulfonic acid and 100mL distilled water, and use 10%Na 2 CO 3 The pH of the reaction system was maintained at 7 by the aqueous solution, and the reaction was carried out at 25° C. for 11 h. Then add 19.5mmol dimethyltetradecylamine, with 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 9, and the reaction was refluxed for 7 hours. The end point of the two-step reaction was monitored by thin-layer chromatography. Cool to room temperature, add 20 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain pyrimidine-tetradecyl quaternary ammonium salt fluorescent whitening agent with a yield of 87%.
Embodiment 2
[0030] Add 21mmol 2,4-dichloropyrimidine to 31.5mL dimethylformamide and stir at 20°C. Then dropwise add a mixture of 10mmol 4,4'-diaminostilbene-2,2'-disulfonic acid and 110mL distilled water, with 10%Na 2 CO 3 The pH of the reaction system was maintained at 8 with the aqueous solution, and the reaction was carried out at 25° C. for 10 h. Then add 19.5mmol dimethyltetradecylamine, with 10% Na 2 CO 3 The pH of the system was maintained at 8 with the aqueous solution, and the reaction was refluxed for 6 hours. The end point of the two-step reaction was monitored by thin-layer chromatography. Cool to room temperature, add 20 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain pyrimidine-tetradecyl quaternary ammonium salt fluorescent whitening agent with a yield of 83%.
Embodiment 3
[0032] Add 21mmol 2,4-dichloropyrimidine to 26mL dimethylformamide and stir at 25°C. Then dropwise add a mixture of 10mmol 4,4'-diaminostilbene-2,2'-disulfonic acid and 100mL distilled water, and use 10%Na 2 CO 3 The pH of the reaction system was maintained at 7.5 with the aqueous solution, and the reaction was carried out at 25°C for 11 hours. Then add 19.5mmol dimethyltetradecylamine, with 10% Na 2 CO 3 The aqueous solution maintained the pH of the system at 9, and the reaction was refluxed for 7 hours. The end point of the two-step reaction was monitored by thin-layer chromatography. Cool to room temperature, add 20 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain pyrimidine-tetradecyl quaternary ammonium salt fluorescent whitening agent with a yield of 84.5%.
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