Amino-acetic-acid pyrimidyl fluorescent whitening agent, preparation method and application thereof
A technology of pyrimidinyl acetate and fluorescent whitening agent, which is applied in chemical instruments and methods, luminescent materials, textiles and papermaking, etc., can solve the problems of expensive raw materials, serious environmental pollution, poor practicability and the like, and achieves simple synthesis method, The effect of low dyeing concentration and strong practicality
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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 aqueous solution maintained the pH of the reaction system at 7, and reacted at 25° C. for 11 h to obtain a reaction mixture I. Then add 22mmol 2-aminoacetic acid in the reaction mixture I, with 10%Na 2 CO 3 The pH of the system was maintained at 9 with the aqueous solution, and the reaction mixture was refluxed for 6 hours to obtain the reaction mixture II. The end point of the two-step reaction was monitored by thin-layer chromatography. Cool the reaction mixture II to room temperature, add 10 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain pyrimidinyl aminoacetic acid fluorescent whitening agent with a yield of 86%.
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 aqueous solution maintained the pH of the reaction system at 8, and reacted at 25° C. for 10 h to obtain a reaction mixture I. Then add 20mmol 2-aminoacetic acid in the reaction mixture I, with 10%Na 2 CO 3 The pH of the system was maintained at 8 with the aqueous solution, and the reaction mixture was refluxed for 5 hours to obtain the reaction mixture II. The end point of the two-step reaction was monitored by thin-layer chromatography. Cool the reaction mixture II to room temperature, add 10 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain pyrimidinyl aminoacetic acid 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 aqueous solution maintained the pH of the reaction system=7.5, and reacted at 25° C. for 11 h to obtain a reaction mixture I. Then add 21mmol 2-aminoacetic acid in the reaction mixture I, with 10%Na 2 CO 3 The pH of the system was maintained at 9 with the aqueous solution, and the reaction mixture was refluxed for 5 hours to obtain the reaction mixture II. The end point of the two-step reaction was monitored by thin-layer chromatography. Cool the reaction mixture II to room temperature, add 10 g of sodium chloride, stir, filter with suction, and dry in vacuum to obtain pyrimidinyl aminoacetic acid fluorescent whitening agent with a yield of 85%.
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