Water-soluble paper light stabilizer and preparation and applications thereof

Abstract

The invention relates to a water-soluble paper light stabilizer and a preparation method thereof. The preparation method of the water-soluble paper light stabilizer comprises the step of enabling 3-chloro-2-hydroxypropylsulfonate to react with 7-hydroxyl-4-methylumbelliferone fluorescent brightener, hindered amine light stabilizer amino-1,2,2,6,6-pentametylniperidine, hindered amine light stabilizer 1,2,2,6,6-pentamethyl-piperidinol respectively, so as to obtain a series of paper light stabilizers with better water solubility; the applications are as follows: matching the synthesized water-soluble coumarin fluorescent brightener with any water-soluble hindered light stabilizer for use, dissolving with gelatinized oxidized starch solution to obtain paper light stabilizer surface sizing material with better water solubility, and coating the sizing material on a high-yield size handsheet for inhibiting the yellowing of paper. The water-soluble paper light stabilizer has the advantages of being simple in the synthesis method, desirable in fluorescent brightening effect, good in thermal stability and the like, and the light-induction yellowing degree of the paper can be effectively reduced by fully utilizing the synergistic effect of the coumarin fluorescent brightener and the hindered amine light stabilizer.

Description

technical field

[0001] The invention belongs to the field of high-yield pulp light stabilizers, in particular to a water-soluble paper light stabilizer and its preparation and application. Background technique

[0002] Due to the multiple and complex mechanisms of high-yield pulp turning yellow when exposed to light, it is difficult to achieve low-cost and high-efficiency light stabilization with a single chemical additive. Moreover, most additives have poor water solubility and poor binding with paper fibers. If a variety of functional groups can be used together to make them fully exert the synergistic effect between molecules, and apply them to inhibit the photo-yellowing of high-yield pulp, it will not only broaden the application range of high-yield pulp, but also reduce the Input cost, improve its economic efficiency.

[0003] Previously, the patent 201210391346.X reported a high-yield slurry yellowing inhibitor compounded with naphthalimide fluorescent whitening age...

Examples

Embodiment 1

[0025] The light stabilizer synthesized by the present embodiment is a single water-soluble coumarin type optical brightener, and its structural formula is:

[0026]

[0027] The specific steps of synthesizing the photostabilizer of above formula structure are:

[0028] Add 3-chloro-2-hydroxypropyl sodium sulfonate and 7-hydroxyl-4-methylcoumarin fluorescent whitening agent in the amount of the same substance in the three-necked flask, adjust the pH to 10-11 with sodium hydroxide, React at 35-45°C for 5-7 hours to obtain a mixed solution. After cooling the mixed solution to room temperature, pour it into acetone and let it stand for precipitation. Suction filter the precipitate and dry it in vacuum to obtain a powdery compound with a yield of 82.9%.

[0029] The above-mentioned 3-chloro-2-hydroxypropyl sodium sulfonate can be purchased, and can also be made by yourself: feed sodium bisulfite and epichlorohydrin according to a certain ratio of substances, and adjust it with ...

Embodiment 2

[0035] The light stabilizer synthesized in this embodiment is a single water-soluble hindered amine light stabilizer, and its structural formula is:

[0036]

[0037] The specific steps for synthesizing the light stabilizer with the above formula structure are: add a certain amount of 3-chloro-2-hydroxypropyl sodium sulfonate aqueous solution and 1,2,2,6,6- Pentamethylpiperidinamine, adjust the pH to 9-10 with sodium hydroxide, react at 25-35°C for 4-6h to obtain a mixed solution, cool the mixed solution to room temperature, pour it into acetone and let it settle, and pump the precipitate After filtration and vacuum drying, the powdery compound was obtained with a yield of 83.3%.

[0038] The infrared identification results of the synthetic product are as follows: From the infrared spectrum of the synthetic product, it can be seen that the characteristic peak of the functional group in the molecular structure of the target product is 3347cm -1 The stretching vibration peak...

Embodiment 3

[0040] The light stabilizer synthesized in this embodiment is a water-soluble hindered amine light stabilizer, and its structural formula is:

[0041]

[0042] The specific steps for synthesizing the light stabilizer with the above formula structure are: add a certain amount of 3-chloro-2-hydroxypropyl sodium sulfonate aqueous solution and 1,2,2,6,6- Pentamethylpiperidinol, adjust the pH to 10-11 with sodium hydroxide, react at 35-45°C for 5-6h to obtain a mixed solution, cool the mixed solution to room temperature, pour it into acetone and let it stand for precipitation, and pump the precipitate After filtration and vacuum drying, the powdery compound was obtained with a yield of 80.6%.

[0043] The infrared identification results of the synthetic product are as follows: From the infrared spectrum of the synthetic product, it can be seen that the characteristic peak of the functional group in the molecular structure of the target product, 3361cm -1 The stretching vibratio...

technical field

[0001] The invention belongs to the field of high-yield pulp light stabilizers, in particular to a water-soluble paper light stabilizer and its preparation and application. Background technique

[0002] Due to the multiple and complex mechanisms of high-yield pulp turning yellow when exposed to light, it is difficult to achieve low-cost and high-efficiency light stabilization with a single chemical additive. Moreover, most additives have poor water solubility and poor binding with paper fibers. If a variety of functional groups can be used together to make them fully exert the synergistic effect between molecules, and apply them to inhibit the photo-yellowing of high-yield pulp, it will not only broaden the application range of high-yield pulp, but also reduce the Input cost, improve its economic efficiency.

[0003] Previously, the patent 201210391346.X reported a high-yield slurry yellowing inhibitor compounded with naphthalimide fluorescent whitening age...

Examples

Embodiment 1

[0025] The light stabilizer synthesized by the present embodiment is a single water-soluble coumarin type optical brightener, and its structural formula is:

[0026]

[0027] The specific steps of synthesizing the photostabilizer of above formula structure are:

[0028] Add 3-chloro-2-hydroxypropyl sodium sulfonate and 7-hydroxyl-4-methylcoumarin fluorescent whitening agent in the amount of the same substance in the three-necked flask, adjust the pH to 10-11 with sodium hydroxide, React at 35-45°C for 5-7 hours to obtain a mixed solution. After cooling the mixed solution to room temperature, pour it into acetone and let it stand for precipitation. Suction filter the precipitate and dry it in vacuum to obtain a powdery compound with a yield of 82.9%.

[0029] The above-mentioned 3-chloro-2-hydroxypropyl sodium sulfonate can be purchased, and can also be made by yourself: feed sodium bisulfite and epichlorohydrin according to a certain ratio of substances, and adjust it with ...

Embodiment 2

[0035] The light stabilizer synthesized in this embodiment is a single water-soluble hindered amine light stabilizer, and its structural formula is:

[0036]

[0037] The specific steps for synthesizing the light stabilizer with the above formula structure are: add a certain amount of 3-chloro-2-hydroxypropyl sodium sulfonate aqueous solution and 1,2,2,6,6- Pentamethylpiperidinamine, adjust the pH to 9-10 with sodium hydroxide, react at 25-35°C for 4-6h to obtain a mixed solution, cool the mixed solution to room temperature, pour it into acetone and let it settle, and pump the precipitate After filtration and vacuum drying, the powdery compound was obtained with a yield of 83.3%.

[0038] The infrared identification results of the synthetic product are as follows: From the infrared spectrum of the synthetic product, it can be seen that the characteristic peak of the functional group in the molecular structure of the target product is 3347cm -1 The stretching vibration peak...

Embodiment 3

[0040] The light stabilizer synthesized in this embodiment is a water-soluble hindered amine light stabilizer, and its structural formula is:

[0041]

[0042] The specific steps for synthesizing the light stabilizer with the above formula structure are: add a certain amount of 3-chloro-2-hydroxypropyl sodium sulfonate aqueous solution and 1,2,2,6,6- Pentamethylpiperidinol, adjust the pH to 10-11 with sodium hydroxide, react at 35-45°C for 5-6h to obtain a mixed solution, cool the mixed solution to room temperature, pour it into acetone and let it stand for precipitation, and pump the precipitate After filtration and vacuum drying, the powdery compound was obtained with a yield of 80.6%.

[0043] The infrared identification results of the synthetic product are as follows: From the infrared spectrum of the synthetic product, it can be seen that the characteristic peak of the functional group in the molecular structure of the target product, 3361cm -1 The stretching vibratio...

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