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.

Active Publication Date: 2013-01-23
南京旭美化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of existing yellowing inhibitory additives such as single action mechanism and large addition amount, and provide a yellowing inhibitor based on naphthalimide fluorescent whitening agent and its preparation method and application

Method used

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  • Yellowing inhibitor based on naphthalimide fluorescent whitening agent, and preparation method and application thereof
  • Yellowing inhibitor based on naphthalimide fluorescent whitening agent, and preparation method and application thereof
  • Yellowing inhibitor based on naphthalimide fluorescent whitening agent, and preparation method and application thereof

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Experimental program
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Effect test

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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Abstract

The invention discloses a yellowing inhibitor based on naphthalimide fluorescent whitening agent, and a preparation method and application thereof. The preparation method comprises the following steps: taking cyanuric chloride as a crosslinking monomer, introducing free group trapping agent 2,2,6,6-tetramethyl piperylhydrazine or 2,2,6,6-tetramethyl piperidinol and naphthalimide fluorescent whitening agent into the same molecule, and further introducing an amino water-soluble compound, thus synthesizing a new pulp yellowing inhibitor having high yield. According to the invention, multiple functional groups are grafted in the same molecular structure, the yellowing of paper pulp is inhibited through multiple mechanisms and approaches, and the novel concept of multifunctional molecule design is embodied; and the yellowing inhibitor has a favorable effect of inhibiting the yellowing of paper pulp.

Description

technical field [0001] The invention relates to the field of yellowing inhibitors for inhibiting the yellowing of high-yield pulp, in particular to a yellowing inhibitor based on a naphthalimide fluorescent whitening agent and a preparation method and application thereof. Background technique [0002] High-yield pulp still contains a lot of lignin due to its lignin-retaining bleaching, resulting in unstable whiteness of high-brightness paper under the influence of external environments, such as light induction, heat induction, and metal ions. , it is easy to return to yellow, and this fatal defect greatly limits the expansion of its application field. Therefore, how to avoid or suppress the yellowing of high-yield pulp brightness has been a problem that papermakers have expected to solve for many years. [0003] Studies have shown that light-induced yellowing is the main way to reduce the brightness of high-yield pulp. There are many ways and measures to suppress photo-yel...

Claims

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Application Information

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IPC IPC(8): C07D401/14D21H21/30
Inventor 张光华郭锦鸽徐海龙刘国俊强轶石丽丽
Owner 南京旭美化工有限公司
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