A deinking agent containing p-nitrobenzyl alcohol and a preparation method thereof

Abstract

The application relates to the technical field of deinking agents, and discloses a deinking agent containing p-nitrobenzyl alcohol and a preparation method thereof, the preparation method being as follows: p-nitrobenzyl alcohol is mixed with water, stirred until completely dissolved, modified cardanol, modified chitosan and sodium citrate are added, stirring is carried out at 40-60 DEG C for 1-2 hours, then polysiloxane is added, the pH value is adjusted to 8-10, and the deinking agent containing p-nitrobenzyl alcohol is obtained after filtration. The deinking agent has high deinking efficiency and good biodegradability.

Description

Technical Field

[0001] This invention relates to the field of deinking agent technology, specifically to a deinking agent containing p-nitrobenzyl alcohol and its preparation method. Background Technology

[0002] With the increasing demand for waste paper, newsprint, office waste paper, and magazine paper have become major sources of waste paper that are widely collected and recycled. People are paying more and more attention to improving the recycling rate of waste paper, making waste paper deinking technology a hot research topic in the papermaking industry. Traditional deinking agents mainly rely on surfactants to achieve separation by reducing the surface tension between ink and fibers. In existing technologies, organic solvent-based deinking agents can quickly penetrate ink, but they pose safety hazards such as excessive volatile organic compounds and flammability. Water-based deinking agents generally suffer from insufficient dissolving ability for oil-based inks and low deinking efficiency. Therefore, avoiding these problems is key to solving the issue. For example, patent CN114806261A discloses a deinking agent and its preparation method and application. This deinking agent includes the following components: solvent, solubilizer, strong alkaline substance, and anti-adhesion agent. This invention not only has long-lasting deinking ability but also effectively reduces the stickiness of the detached ink residue. However, its biodegradability is generally poor, and its deinking efficiency needs to be improved. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a deinking agent containing p-nitrobenzyl alcohol and its preparation method. The deinking agent of this invention has high deinking efficiency and good biodegradability.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a deinking agent containing p-nitrobenzyl alcohol and its preparation method, comprising the following weight components: 8-12 parts by weight of p-nitrobenzyl alcohol, 5-10 parts by weight of modified cashew nut shell powder, 4-6 parts by weight of modified chitosan, 1-3 parts by weight of sodium citrate, 0.2-0.4 parts by weight of polysiloxane, and 12-15 parts by weight of water.

[0007] Furthermore, the preparation method of the modified cashew phenol is as follows:

[0008] Step 1: Add cashew phenol and 4-vinylbenzoic acid to the reactor, stir and mix, then add p-toluenesulfonic acid catalyst and toluene dehydrating agent. React at 130-160℃ for 4-6 hours. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1.

[0009] Step 2: Under inert gas protection, add intermediate 1 and hexamethyldisilazane to dichloromethane solvent, stir and mix, then add chloroplatinic acid catalyst dropwise, and continue stirring at 40-50℃ for 8-12 hours to carry out the reaction. After the reaction is completed, dry and concentrate under reduced pressure to obtain intermediate 2.

[0010] Step 3: Under inert gas protection, add intermediate 2 and benzyl chloride to carbon tetrachloride solvent, stir evenly, and react at 30-60℃ for 10-12 hours. After the reaction is completed, wash and dry, and distill under reduced pressure to obtain modified cashew phenol.

[0011] Furthermore, in step one, the ratio of cashew phenol, 4-vinylbenzoic acid, p-toluenesulfonic acid, and toluene is 6.6-6.8g:3.1-3.4g:0.22-0.25g:18-20mL.

[0012] Furthermore, in step two, the ratio of dichloromethane, intermediate 1, hexamethyldisilazane, and chloroplatinic acid is 12-15 mL: 4.5-4.8 g: 1.7-2 g: 0.05-0.06 g.

[0013] Furthermore, in step three, the ratio of carbon tetrachloride, intermediate 2, and benzyl chloride is 40-42 mL: 8.6-8.8 g: 4.5-4.7 g.

[0014] Furthermore, the method for preparing the modified chitosan is as follows:

[0015] S1: Add palmitic acid and epichlorohydrin to toluene solvent, stir and mix, then add potassium hydroxide catalyst, stir at 60-80℃ for 7-10 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1;

[0016] S2: Under inert gas protection, chitosan is swollen in a 3% acetic acid solution for 1-2 hours, then intermediate 1 is added and stirred. The mixture is reacted at 80-90℃ for 12-14 hours. After the reaction is completed, the mixture is cooled, the pH is adjusted to 7.0, the precipitate is collected, washed and dried to obtain modified chitosan.

[0017] Furthermore, the ratio of toluene, palmitic acid, epichlorohydrin, and potassium hydroxide in S1 is 25-27 mL: 2.56-2.58 g: 3.23-3.25 g: 0.02-0.03 g.

[0018] Furthermore, the ratio of chitosan, acetic acid, and intermediate 1 in S2 is 3-3.2g:18-20mL:1.4-1.6g.

[0019] Furthermore, the deinking agent containing p-nitrobenzyl alcohol and its preparation method are as follows: p-nitrobenzyl alcohol is mixed with water and stirred until completely dissolved. Modified cashew phenol, modified chitosan, and sodium citrate are added and stirred at 40-60℃ for 1-2 hours. Then, polysiloxane is added, the pH is adjusted to 8-10, and the deinking agent containing p-nitrobenzyl alcohol is obtained after filtration.

[0020] (III) Beneficial Technical Effects

[0021] This invention involves mixing p-nitrobenzyl alcohol with water, stirring until completely dissolved, adding modified cashew phenol, modified chitosan, and sodium citrate, stirring at 40-60°C for 1-2 hours, then adding polysiloxane, adjusting the pH to 8-10, and filtering to obtain a deinking agent containing p-nitrobenzyl alcohol.

[0022] Surfactants prepared from cashew nut phenol as a raw material possess excellent emulsifying, penetrating, and dispersing abilities, as well as good biodegradability and superior environmental performance due to their unique structure. During the preparation of modified cashew phenol, quaternary ammonium salt groups are introduced, and the cations of the quaternary ammonium salt (-N...)... + Chitosan can strongly adsorb negatively charged ink particles through electrostatic attraction, neutralizing the surface charge and weakening the binding force between ink and fiber, making it easier for ink to detach from the fiber surface and improving deinking efficiency. In deinking agents, chitosan plays multiple key roles through its unique cationic, adsorption, film-forming, and biodegradable properties, significantly improving deinking efficiency and fiber quality. Alkylated modified chitosan, due to the long carbon chains introduced by alkylation, can strongly adsorb non-polar components in ink through van der Waals forces. Furthermore, the hydrophobic alkyl chains and hydrophilic chitosan backbone of alkylated chitosan spontaneously assemble into micelles, encapsulating ink particles, reducing oil-water interfacial tension, improving emulsion stability, and thus enhancing the deinking efficiency of the deinking agent. Attached Figure Description

[0023] Figure 1 This is the 1H NMR spectrum of intermediate 1 in Example 1 (1).

[0024] Figure 2 This is the 1H NMR spectrum of intermediate 2 in Example 1 (2).

[0025] Figure 3 This is the 1H NMR spectrum of the modified cashew phenol in Example 1 (3).

[0026] Figure 4 This is the 1H NMR spectrum of intermediate 1 in Example 1 (4).

[0027] Figure 5 This is the 1H NMR spectrum of the modified chitosan in Example 1 (5). Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] (1) Add 6.6g of cashew phenol and 3.1g of 4-vinylbenzoic acid to the reactor, stir and mix, then add 0.22g of p-toluenesulfonic acid catalyst and 18mL of toluene dehydrating agent. React at 130℃ for 4h. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1; the reaction process is as follows:

[0032]

[0033] (2) Under nitrogen protection, 4.5 g of intermediate 1 and 1.7 g of hexamethyldisilazane were added to 12 mL of dichloromethane solvent and stirred. Then, 0.05 g of chloroplatinic acid catalyst was added dropwise. The reaction was carried out by stirring continuously at 40 °C for 8 h. After the reaction was completed, the mixture was dried and concentrated under reduced pressure to obtain intermediate 2. The reaction process is as follows:

[0034]

[0035] (3) Under nitrogen protection, 8.6 g of intermediate 2 and 4.5 g of benzyl chloride were added to 40 mL of carbon tetrachloride solvent, stirred until homogeneous, and reacted at 30 °C for 10 h. After the reaction was completed, the mixture was washed, dried, and distilled under reduced pressure to obtain modified cashew nut shellac. The reaction process is as follows:

[0036]

[0037] (4) Add 2.56 g of palmitic acid and 3.23 g of epichlorohydrin to 25 mL of toluene solvent, stir and mix, then add 0.02 g of potassium hydroxide catalyst, stir at 60 °C for 7 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1; the reaction process is as follows:

[0038]

[0039] (5) Under nitrogen protection, 3g of chitosan was swollen in 18mL of 3% acetic acid solution for 1h, then 1.4g of intermediate 1 was added, stirred and mixed, and reacted at 80℃ for 12h. After the reaction was completed, the mixture was cooled, the pH was adjusted to 7.0, the precipitate was collected, washed and dried to obtain modified chitosan; the reaction process is as follows:

[0040]

[0041] (6) Mix 8 parts by weight of p-nitrobenzyl alcohol with 12 parts by weight of water and stir until completely dissolved. Add 5 parts by weight of modified cashew phenol, 4 parts by weight of modified chitosan and 1 part by weight of sodium citrate. Stir at 40°C for 1 hour. Then add 0.2 parts by weight of polysiloxane and adjust the pH to 8. After filtration, obtain a deinking agent containing p-nitrobenzyl alcohol.

[0042] Example 2

[0043] (1) Add 6.8g of cashew phenol and 3.4g of 4-vinylbenzoic acid to the reactor, stir and mix, then add 0.25g of p-toluenesulfonic acid catalyst and 20mL of toluene dehydrating agent. React at 160℃ for 6h. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1.

[0044] (2) Under nitrogen protection, 4.8 g of intermediate 1 and 2 g of hexamethyldisilazane were added to 15 mL of dichloromethane solvent and stirred. Then, 0.06 g of chloroplatinic acid catalyst was added dropwise and the reaction was carried out by stirring at 50 °C for 12 h. After the reaction was completed, the mixture was dried and concentrated under reduced pressure to obtain intermediate 2.

[0045] (3) Under nitrogen protection, 8.8 g of intermediate 2 and 4.7 g of benzyl chloride were added to 42 mL of carbon tetrachloride solvent, stirred evenly, and reacted at 60 °C for 12 h. After the reaction was completed, the mixture was washed and dried, and then distilled under reduced pressure to obtain modified cashew phenol.

[0046] (4) Add 2.58 g of palmitic acid and 3.25 g of epichlorohydrin to 27 mL of toluene solvent, stir and mix, then add 0.03 g of potassium hydroxide catalyst, stir at 80 °C for 10 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1.

[0047] (5) Under nitrogen protection, 3.2 g of chitosan was swollen in 20 mL of 3% acetic acid solution for 2 h, and then 1.6 g of intermediate 1 was added and stirred. The mixture was reacted at 90 °C for 14 h. After the reaction was completed, the mixture was cooled, the pH was adjusted to 7.0, the precipitate was collected, washed and dried to obtain modified chitosan.

[0048] (6) Mix 12 parts by weight of p-nitrobenzyl alcohol with 15 parts by weight of water and stir until completely dissolved. Add 10 parts by weight of modified cashew phenol, 6 parts by weight of modified chitosan and 3 parts by weight of sodium citrate. Stir at 60°C for 2 hours. Then add 0.4 parts by weight of polysiloxane and adjust the pH to 10. After filtration, obtain a deinking agent containing p-nitrobenzyl alcohol.

[0049] Example 3

[0050] (1) Add 6.7g of cashew phenol and 3.3g of 4-vinylbenzoic acid to the reactor, stir and mix, then add 0.24g of p-toluenesulfonic acid catalyst and 19mL of toluene dehydrating agent. React at 145℃ for 5h. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1.

[0051] (2) Under nitrogen protection, 4.6 g of intermediate 1 and 1.8 g of hexamethyldisilazane were added to 13 mL of dichloromethane solvent and stirred. Then, 0.05 g of chloroplatinic acid catalyst was added dropwise and the reaction was carried out by stirring at 45 °C for 10 h. After the reaction was completed, the mixture was dried and concentrated under reduced pressure to obtain intermediate 2.

[0052] (3) Under nitrogen protection, 8.7 g of intermediate 2 and 4.6 g of benzyl chloride were added to 41 mL of carbon tetrachloride solvent, stirred evenly, and reacted at 45 °C for 11 h. After the reaction was completed, the mixture was washed and dried, and then distilled under reduced pressure to obtain modified cashew phenol.

[0053] (4) Add 2.57 g of palmitic acid and 3.24 g of epichlorohydrin to 26 mL of toluene solvent, stir and mix, then add 0.02 g of potassium hydroxide catalyst, stir at 70 °C for 8 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1.

[0054] (5) Under nitrogen protection, 3.1 g of chitosan was swollen in 19 mL of 3% acetic acid solution for 1 h, and then 1.5 g of intermediate 1 was added and stirred. The mixture was reacted at 85 °C for 13 h. After the reaction was completed, the mixture was cooled, the pH was adjusted to 7.0, the precipitate was collected, washed and dried to obtain modified chitosan.

[0055] (6) Mix 10 parts by weight of p-nitrobenzyl alcohol with 13 parts by weight of water and stir until completely dissolved. Add 7 parts by weight of modified cashew phenol, 5 parts by weight of modified chitosan and 2 parts by weight of sodium citrate. Stir at 50°C for 1 hour. Then add 0.3 parts by weight of polysiloxane and adjust the pH to 9. After filtration, obtain a deinking agent containing p-nitrobenzyl alcohol.

[0056] Example 4

[0057] (1) Add 6.6g of cashew phenol and 3.2g of 4-vinylbenzoic acid to the reactor, stir and mix, then add 0.23g of p-toluenesulfonic acid catalyst and 18mL of toluene dehydrating agent. React at 140℃ for 4h. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1.

[0058] (2) Under nitrogen protection, 4.6 g of intermediate 1 and 1.8 g of hexamethyldisilazane were added to 13 mL of dichloromethane solvent and stirred. Then, 0.05 g of chloroplatinic acid catalyst was added dropwise and the reaction was carried out by stirring at 43 °C for 9 h. After the reaction was completed, the mixture was dried and concentrated under reduced pressure to obtain intermediate 2.

[0059] (3) Under nitrogen protection, 8.7 g of intermediate 2 and 4.5 g of benzyl chloride were added to 40 mL of carbon tetrachloride solvent, stirred evenly, and reacted at 40 °C for 10 h. After the reaction was completed, the mixture was washed and dried, and then distilled under reduced pressure to obtain modified cashew phenol.

[0060] (4) Add 2.56 g of palmitic acid and 3.24 g of epichlorohydrin to 25 mL of toluene solvent, stir and mix, then add 0.02 g of potassium hydroxide catalyst, stir at 65 °C for 8 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1.

[0061] (5) Under nitrogen protection, 3g of chitosan was swollen in 18mL of 3% acetic acid solution for 1h, and then 1.5g of intermediate 1 was added. The mixture was stirred and mixed, and the reaction was carried out at 85℃ for 12h. After the reaction was completed, the mixture was cooled, the pH was adjusted to 7.0, the precipitate was collected, washed and dried to obtain modified chitosan.

[0062] (6) Mix 9 parts by weight of p-nitrobenzyl alcohol with 13 parts by weight of water and stir until completely dissolved. Add 6 parts by weight of modified cashew phenol, 5 parts by weight of modified chitosan and 1 part by weight of sodium citrate. Stir at 45°C for 1 hour. Then add 0.2 parts by weight of polysiloxane and adjust the pH to 8. After filtration, obtain a deinking agent containing p-nitrobenzyl alcohol.

[0063] Example 5

[0064] (1) Add 6.8g of cashew phenol and 3.3g of 4-vinylbenzoic acid to the reactor, stir and mix, then add 0.24g of p-toluenesulfonic acid catalyst and 20mL of toluene dehydrating agent. React at 150℃ for 6h. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1.

[0065] (2) Under nitrogen protection, 4.7 g of intermediate 1 and 1.9 g of hexamethyldisilazane were added to 14 mL of dichloromethane solvent and stirred. Then, 0.06 g of chloroplatinic acid catalyst was added dropwise and the reaction was carried out by stirring at 50 °C for 11 h. After the reaction was completed, the mixture was dried and concentrated under reduced pressure to obtain intermediate 2.

[0066] (3) Under nitrogen protection, 8.7 g of intermediate 2 and 4.7 g of benzyl chloride were added to 42 mL of carbon tetrachloride solvent, stirred evenly, and reacted at 50 °C for 12 h. After the reaction was completed, the mixture was washed and dried, and then distilled under reduced pressure to obtain modified cashew phenol.

[0067] (4) Add 2.58 g of palmitic acid and 3.24 g of epichlorohydrin to 27 mL of toluene solvent, stir and mix, then add 0.03 g of potassium hydroxide catalyst, stir at 75 °C for 9 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1;

[0068] (5) Under nitrogen protection, 3.2g of chitosan was swollen in 20mL of 3% acetic acid solution for 2h, and then 1.5g of intermediate 1 was added and stirred. The mixture was reacted at 90℃ for 13h. After the reaction was completed, the mixture was cooled, the pH was adjusted to 7.0, the precipitate was collected, washed and dried to obtain modified chitosan.

[0069] (6) Mix 11 parts by weight of p-nitrobenzyl alcohol with 14 parts by weight of water and stir until completely dissolved. Add 9 parts by weight of modified cashew phenol, 6 parts by weight of modified chitosan and 3 parts by weight of sodium citrate. Stir at 55°C for 2 hours. Then add 0.4 parts by weight of polysiloxane and adjust the pH to 10. After filtration, obtain a deinking agent containing p-nitrobenzyl alcohol.

[0070] Comparative Example 1

[0071] The difference between this comparative example and Example 5 is that intermediate 1 in (1) is used instead of modified cashew phenol.

[0072] Comparative Example 2

[0073] The difference between this comparative example and Example 5 is that intermediate 2 in (2) is used instead of modified cashew phenol.

[0074] Comparative Example 3

[0075] The difference between this comparative example and Example 5 is that chitosan was used instead of modified chitosan.

[0076] De-inking efficiency test:

[0077] The deinking agents containing p-nitrobenzyl alcohol prepared in Examples 1-5 and Comparative Examples 1-3 were tested for deinking efficiency according to GB / T 24993-2010 "Determination of Deinking Degree of Paper and Paperboard". The results are shown in Table 1.

[0078] Biodegradability performance test:

[0079] The deinking agents containing p-nitrobenzyl alcohol prepared in Examples 1-5 and Comparative Examples 1-3 were tested for biodegradability according to GB / T 15818-2006 "Test Method for Biodegradability of Surfactants". The results are shown in Table 1.

[0080] Table 1: Deinking rate and degradation rate test.

[0081] Group Whiteness (%) Deinking time (min) Deinking rate (%) Degradation rate (%) Example 1 87.7 7 90.8 96.5 Example 2 88.8 6 92.3 97.4 Example 3 88.4 6 91.9 97.1 Example 4 87.9 7 91.2 96.8 Example 5 88.5 6 92.0 97.2 Comparative Example 1 84.3 10 87.7 95.3 Comparative Example 2 84.6 10 88.5 95.7 Comparative Example 3 85.9 9 89.7 94.2

[0082] As can be seen from Table 1, the deinking agents containing p-nitrobenzyl alcohol prepared in Examples 1-5 of the present invention have shorter demolding time, and improved deinking rate and degradation rate compared with the deinking agents prepared in Comparative Examples 1-3. This indicates that the deinking agent of the present invention has high deinking efficiency and good biodegradability.

[0083] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0085] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments. It should be noted that many modifications and improvements can be made by those skilled in the art, and all modifications or improvements not exceeding the scope of the claims should be considered within the protection scope of the present invention.

Claims

1. A deinking agent containing p-nitrobenzyl alcohol, characterized in that, It includes the following components by weight: 8-12 parts by weight of p-nitrobenzyl alcohol, 5-10 parts by weight of modified cashew nut shell powder, 4-6 parts by weight of modified chitosan, 1-3 parts by weight of sodium citrate, 0.2-0.4 parts by weight of polysiloxane, and 12-15 parts by weight of water. The method for preparing the modified cashew phenol is as follows: Step 1: Add cashew phenol and 4-vinylbenzoic acid to the reactor, stir and mix, then add p-toluenesulfonic acid catalyst and toluene dehydrating agent. React at 130-160℃ for 4-6 hours. After the reaction is completed, cool to room temperature, wash and dry to obtain intermediate 1. Step 2: Under inert gas protection, add intermediate 1 and hexamethyldisilazane to dichloromethane solvent, stir and mix, then add chloroplatinic acid catalyst dropwise, and continue stirring at 40-50℃ for 8-12 hours to carry out the reaction. After the reaction is completed, dry and concentrate under reduced pressure to obtain intermediate 2. Step 3: Under inert gas protection, add intermediate 2 and benzyl chloride to carbon tetrachloride solvent, stir evenly, and react at 30-60℃ for 10-12 hours. After the reaction is completed, wash and dry, and distill under reduced pressure to obtain modified cashew nut powder. The modified chitosan is prepared by: S1: Add palmitic acid and epichlorohydrin to toluene solvent, stir and mix, then add potassium hydroxide catalyst, stir at 60-80℃ for 7-10 h, after the reaction is completed, distill under reduced pressure and dry to obtain intermediate 1; S2: Under inert gas protection, chitosan is swollen in a 3% acetic acid solution for 1-2 hours, then intermediate 1 is added and stirred. The mixture is reacted at 80-90℃ for 12-14 hours. After the reaction is completed, the mixture is cooled, the pH is adjusted to 7.0, the precipitate is collected, washed and dried to obtain modified chitosan.

2. The deinking agent containing p-nitrobenzyl alcohol according to claim 1, characterized in that, In step one, the ratio of cashew phenol, 4-vinylbenzoic acid, p-toluenesulfonic acid, and toluene is 6.6-6.8g: 3.1-3.4g: 0.22-0.25g: 18-20mL.

3. The deinking agent containing p-nitrobenzyl alcohol according to claim 1, characterized in that, In step two, the ratio of dichloromethane, intermediate 1, hexamethyldisilazane, and chloroplatinic acid is 12-15 mL: 4.5-4.8 g: 1.7-2 g: 0.05-0.06 g.

4. The deinking agent containing p-nitrobenzyl alcohol according to claim 1, characterized in that, In step three, the ratio of carbon tetrachloride, intermediate 2, and benzyl chloride used is 40-42 mL: 8.6-8.8 g: 4.5-4.7 g.

5. The deinking agent containing p-nitrobenzyl alcohol according to claim 1, characterized in that, The ratio of toluene, palmitic acid, epichlorohydrin, and potassium hydroxide in S1 is 25-27 mL: 2.56-2.58 g: 3.23-3.25 g: 0.02-0.03 g.

6. The deinking agent containing p-nitrobenzyl alcohol according to claim 1, characterized in that, The ratio of chitosan, acetic acid, and intermediate 1 in S2 is 3-3.2g:18-20mL:1.4-1.6g.

7. A method for preparing a deinking agent containing p-nitrobenzyl alcohol as described in any one of claims 1-6, characterized in that, Mix p-nitrobenzyl alcohol with water and stir until completely dissolved. Add modified cashew phenol, modified chitosan, and sodium citrate. Stir at 40-60℃ for 1-2 hours. Then add polysiloxane and adjust the pH to 8-10. After filtration, obtain a deinking agent containing p-nitrobenzyl alcohol.

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