Yellowing inhibitor based on naphthalimide fluorescent whitening agent, and preparation method and application thereof
A technology of fluorescent whitening agent and naphthalimide, applied in the direction of luminescent/fluorescent substance addition, organic chemistry, etc., can solve the problems of large amount of addition and single mechanism, and achieve the effect of improving the yellowing inhibition effect and good effect.
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Embodiment 1
[0024] Embodiment one: the anti-yellowing inhibitor synthesized by the present embodiment, its structural formula is:
[0025]
[0026] 1. The specific steps of synthesis are:
[0027] 1) Disperse the same amount of cyanuric chloride and sodium taurate in acetone, then adjust the pH to 6, and then condense at 0°C until the pH does not drop, and then heat up to 45°C after the condensation reaction. Then adjust the pH to 8, and then add 2,2,6,6-tetramethylpiperidinamine (amino radical scavenger) with cyanuric chloride and other substances to condense and react until the pH no longer drops to obtain a mixed solution , after the mixed solution is cooled to room temperature, it is poured into acetone for static precipitation, and the precipitate is suction-filtered and dried to obtain a white powdery active radical radical scavenger;
[0028] 2) Add the naphthalimide fluorescent whitening agent into the three-necked bottle, and then add the organic solvent toluene into the thre...
Embodiment 2
[0043] Embodiment two: the anti-yellowing inhibitor synthesized by the present embodiment has a structural formula of:
[0044]
[0045] Synthesize the anti-yellowing inhibitor of the above formula structure, its specific steps are:
[0046] 1) Disperse the same amount of cyanuric chloride and sodium taurate in acetone, then adjust the pH to 6, and then condense at 0°C until the pH does not drop, and then heat up to 45°C after the condensation reaction. Then adjust the pH to 8, and then add 2,2,6,6-tetramethylpiperidinol (hydroxyl radical scavenger) with cyanuric chloride and other substances for condensation reaction until the pH no longer drops to obtain a mixed solution , after the mixed solution is cooled to room temperature, it is poured into acetone for static precipitation, and the precipitate is suction-filtered and dried to obtain a white powdery active radical radical scavenger;
[0047] 2) Add the naphthalimide fluorescent whitening agent into the three-necked b...
Embodiment 3
[0050] Embodiment three: the anti-yellowing inhibitor synthesized by the present embodiment has a structural formula of:
[0051]
[0052] Synthesize the anti-yellowing inhibitor of the above formula structure, its specific steps are:
[0053] 1) Disperse the same amount of cyanuric chloride and diethanolamine in acetone, then adjust the pH to 8, and then condense at 0°C until the pH no longer drops. After the condensation reaction, the temperature is raised to 45°C, and then adjusted The pH is 8, and then add 2,2,6,6-tetramethylpiperidinamine (amino radical scavenger) to condense with cyanuric chloride and other substances until the pH no longer drops to obtain a mixed solution. After the mixed solution was cooled to room temperature, it was poured into acetone for static precipitation, and the precipitate was filtered and dried to obtain a white powdery active radical radical scavenger;
[0054] 2) Add the naphthalimide fluorescent whitening agent into the three-necked b...
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