Raw paper capable of being prepared from waste paper pulp and manufacturing process of raw paper

Abstract

The invention relates to the technical field of papermaking, in particular to base paper capable of being prepared from waste paper pulp and a manufacturing process of the base paper. Modified chitosan is prepared through the reaction of chitosan, acryloyloxyethyl trimethyl ammonium chloride and lauryl acrylate, chitosan contains multiple functional groups such as hydroxyl, amino and carboxyl and has the capacity of forming hydrogen bonds, and after the chitosan reacts with waste paper fibers, through the chemical bond effect, the waste paper fibers can be recycled, and the waste paper fibers can be recycled. The effects of enhancing the fiber strength and improving the tensile property of the raw paper are achieved; meanwhile, chitosan and acryloyloxyethyl trimethyl ammonium chloride have cationic charges, so that the modified chitosan is endowed with the cationic charges, the modified chitosan is dissociated and purified after being blended with waste paper pulp to obtain paper pulp fibers, the paper pulp fibers are soaked in lignosulfonate, lignosulfonate is assembled on the surfaces of the paper pulp fibers under the action of the charges, and the modified chitosan is obtained. And a hydrophobic lignosulfonate layer is obtained, so that the hydrophobic performance of paper pulp fibers is improved, and the prepared raw paper is prevented from being wetted by water.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, in particular to base paper which can be prepared from waste paper pulp and a manufacturing process thereof. Background Art

[0002] With the increasing environmental problems in the world, sustainable development strategies and environmentally friendly treatment solutions have gradually gained popularity and received more and more attention. Waste paper is widely present in modern society, including office documents, newspapers, magazines, cartons and various packaging materials. Traditionally, these waste papers are regarded as garbage and sent directly to landfills or incinerated, but this behavior not only causes environmental pollution, but also leads to waste of resources. Waste paper recycling technology can minimize the waste of natural resources, reduce waste emissions, and reduce energy and water use, so it has become a production method with important economic value and ecological significance. The technology of making base paper from waste paper is not only beneficial to environmental protection, but also can save a lot of wood resources and reduce greenhouse gas emissions. In addition, the recycling of waste paper also provides important economic opportunities for the waste paper recycling industry and promotes the development of the green economy.

[0003] The process of making base paper from waste paper mainly includes the stages of collection, sorting, fiber removal, bleaching, pulping, papermaking and post-processing. The waste paper is collected and recycled, sorted and classified, and the waste paper fibers are separated after impurities are removed. Then they are bleached and finally converted into base paper through the papermaking process and post-processing. However, due to repeated recycling, the length and strength of the waste paper fibers will decrease, which makes the base paper quality of waste paper papermaking relatively low, and it is not suitable for the manufacture of some paper products that require strength, such as packaging materials or high-end printing paper. Therefore, it needs to be processed during the preparation process to improve the quality of the base paper. Summary of the invention

[0004] The object of the present invention is to provide a base paper prepared from waste paper pulp and a manufacturing process thereof, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a base paper prepared from waste paper pulp and a manufacturing process thereof, comprising the following steps:

[0006] Step 1:

[0007] Dissolving chitosan in acetic acid solution to obtain a chitosan solution; mixing the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride and heating them, adding potassium persulfate under a nitrogen environment, sealing and stirring the mixture for reaction, and then cooling the mixture to obtain a modified chitosan;

[0008] Step 2:

[0009] S1: mixing sodium carbonate, polysiloxane and sodium polyacrylate to obtain a compounding auxiliary agent;

[0010] S2: after mixing waste paper and water, adding compound auxiliary agent, stirring to obtain waste paper pulp; mixing the waste paper pulp with modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0011] S3: Soaking pulp fibers in a lignin sulfonate solution, air-drying and then repeating the above soaking operation for 3 to 5 times, taking out and rinsing with deionized water, and drying to obtain modified pulp fibers; mixing the modified pulp fibers with water to obtain a modified pulp slurry, and making sheets to obtain base paper.

[0012] Furthermore, in step 1, the specific preparation method of the modified chitosan is: dissolving chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2-3%; mixing the chitosan solution, lauryl acrylate and acryloyloxyethyltrimethylammonium chloride, heating to 50-80° C., adding potassium persulfate under a nitrogen environment, sealing and stirring the reaction for 2-4 hours, cooling, and obtaining modified chitosan.

[0013] Furthermore, in step 1, the contents of the components in the modified chitosan are, by weight percentage, 10-20% chitosan, 30-40% acryloyloxyethyltrimethylammonium chloride, and 40-60% lauryl acrylate.

[0014] Furthermore, in S1, the contents of the components in the compound auxiliary agent are, by weight percentage, 20-35% sodium carbonate, 35-40% polysiloxane, and 30-40% sodium polyacrylate.

[0015] Furthermore, in S2, the contents of the various components in the waste paper pulp are, by weight percentage, 12-15% waste paper, 1-3% compounding additives, and the remainder is water.

[0016] Furthermore, in S2, the contents of the components in the mixed slurry are, by weight, 100 parts of waste paper slurry and 2.2 to 3.5 parts of modified chitosan.

[0017] Furthermore, in S3, the pulp fibers are immersed in a lignin sulfonate solution at a bath ratio of 1:25-30.

[0018] Furthermore, the pH value of the lignin sulfonate solution in S3 is 10-12.

[0019] Furthermore, in S3, the contents of the components in the modified pulp slurry are, by weight, 1 to 1.5 parts of modified pulp fiber and 5 to 8 parts of water.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention prepares modified chitosan by adding chitosan, acryloyloxyethyl trimethyl ammonium chloride and lauryl acrylate as raw materials, and uses the modified chitosan to modify waste paper pulp. The molecular unit structure of chitosan contains multiple hydroxyl groups, amino groups and carboxyl groups, has the ability to form hydrogen bonds, can react with fibers to form chemical bonds, and can play a reinforcing effect when added to pulp, thereby improving the tensile properties of base paper. At the same time, chitosan and acryloyloxyethyl trimethyl ammonium chloride carry cationic charges, and the pulp fibers obtained by blending, dissociating and removing impurities with pulp also have cationic charges. The pulp fibers are immersed in lignin sulfonate, and assembled on the surface of the pulp fibers through the action of charges to obtain a hydrophobic lignin sulfonate layer, thereby improving the hydrophobic properties of the pulp fibers and preventing the prepared base paper from being wetted by water.

[0021] Since chitosan and acryloyloxyethyl trimethyl ammonium chloride are both hydrophilic, hydrophobic monomer lauryl acrylate is added to modify them, thereby reducing the water absorption performance of paper. In order to further balance the water absorption performance, tensile performance and surface hydrophobic performance, the present invention limits the amount of chitosan, acryloyloxyethyl trimethyl ammonium chloride and lauryl acrylate when preparing the modified chitosan. The modified chitosan prepared by 10-20% chitosan, 30-40% acryloyloxyethyl trimethyl ammonium chloride, and 40-60% lauryl acrylate is added according to 2.2-3.5% of the mass of the waste paper pulp, and the modification effect is the best. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Materials used in the embodiments of the present invention and their sources:

[0024] Chitosan comes from Aladdin, item number C105799-2.5kg; waste paper comes from Shandong Weihai Longgang Paper Industry, mainly office waste paper; polysiloxane comes from Shenzhen Jipeng, model 201; sodium polyacrylate comes from Wanhua Tianhe, item number CA-06; lignin sulfonate is sodium lignin sulfonate, from Yezi Chemical, item number M9.

[0025] Embodiment 1:

[0026] Step 1:

[0027] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 50°C, add potassium persulfate under nitrogen environment, stir and react for 2 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0028] Step 2:

[0029] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0030] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0031] S3: Soak the pulp fiber in a 0.2 g / L lignin sulfonate solution at a bath ratio of 1:25, adjust the pH to 10, soak for 15 minutes, air-dry at 25°C, and repeat the above soaking operation 5 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0032] Embodiment 2:

[0033] Step 1:

[0034] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2.3%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 55°C, add potassium persulfate under nitrogen environment, stir and react for 2.5 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0035] Step 2:

[0036] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0037] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0038] S3: Soak the pulp fiber in a 0.2 g / L lignin sulfonate solution at a bath ratio of 1:28, adjust the pH to 10.5, soak for 15 minutes, air-dry at 27°C, and repeat the above soaking operation for 3 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0039] Embodiment 3:

[0040] Step 1:

[0041] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2.8%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 60°C, add potassium persulfate under nitrogen environment, stir and react for 2.5 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0042] Step 2:

[0043] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0044] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0045] S3: Soak the pulp fiber in a 0.2 g / L lignin sulfonate solution at a bath ratio of 1:26, adjust the pH to 11, soak for 20 minutes, air-dry at 27°C, and repeat the above soaking operation 4 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0046] Embodiment 4:

[0047] Step 1:

[0048] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2.1%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 63°C, add potassium persulfate under nitrogen environment, stir and react for 3 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0049] Step 2:

[0050] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0051] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0052] S3: Soak the pulp fiber in a 0.3 g / L lignin sulfonate solution at a bath ratio of 1:29, adjust the pH to 10.5, soak for 18 minutes, air-dry at 28°C, and repeat the above soaking operation for 3 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0053] Embodiment 5:

[0054] Step 1:

[0055] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 3%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 60°C, add potassium persulfate under nitrogen environment, stir and react for 3.5 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0056] Step 2:

[0057] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0058] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0059] S3: Soak the pulp fiber in a 0.3 g / L lignin sulfonate solution at a bath ratio of 1:27, adjust the pH to 12, soak for 22 minutes, air-dry at 29°C, repeat the above soaking operation 4 times, take out, rinse with deionized water, and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0060] Embodiment 6:

[0061] Step 1:

[0062] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 3%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 80°C, add potassium persulfate under nitrogen environment, stir and react for 4 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0063] Step 2:

[0064] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0065] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0066] S3: Soak the pulp fiber in a 0.3 g / L lignin sulfonate solution at a bath ratio of 1:30, adjust the pH to 12, soak for 30 minutes, air-dry at 30°C, and repeat the above soaking operation for 3 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0067] Comparative Example 1: Pulp fiber was prepared without adding modified chitosan, and other parameters were the same as those in Example 1.

[0068] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0069] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; dissociating the mixed pulp into filamentous fibers, and removing impurities to obtain pulp fibers;

[0070] S3: Soak the pulp fiber in a 0.2 g / L lignin sulfonate solution at a bath ratio of 1:25, adjust the pH to 10, soak for 15 minutes, air-dry at 25°C, and repeat the above soaking operation 5 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0071] Comparative Example 2: The content of lauryl acrylate in the modified chitosan was reduced, and the other parameters were the same as those in Example 2.

[0072] Step 1:

[0073] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2.3%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 55°C, add potassium persulfate under nitrogen environment, stir and react for 2.5 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 40% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 20% lauryl acrylate;

[0074] Step 2:

[0075] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0076] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0077] S3: Soak the pulp fiber in a 0.2 g / L lignin sulfonate solution at a bath ratio of 1:28, adjust the pH to 10.5, soak for 15 minutes, air-dry at 27°C, and repeat the above soaking operation for 3 times. After taking out, rinse with deionized water and dry to obtain modified pulp fiber; mix 1 kg of modified pulp fiber with 5 kg of water to obtain modified pulp slurry, and make sheets to obtain base paper.

[0078] Comparative Example 3: The pulp fibers were not soaked with lignin sulfonate, and the other parameters were the same as those in Example 3.

[0079] Step 1:

[0080] Dissolve chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2.8%; mix the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride, heat to 60°C, add potassium persulfate under nitrogen environment, stir and react for 2.5 hours in a sealed state, and cool to obtain modified chitosan, wherein the content of each component in the modified chitosan is, by weight percentage, 20% chitosan, 40% acryloyloxyethyl trimethyl ammonium chloride, and 40% lauryl acrylate;

[0081] Step 2:

[0082] S1: By weight percentage, 22% sodium carbonate, 39% polysiloxane, and 39% sodium polyacrylate are mixed to obtain a compound auxiliary agent;

[0083] S2: after mixing waste paper and water, adding compounding auxiliary agent, stirring to obtain waste paper pulp, which is 13% waste paper, 2% compounding auxiliary agent, and 85% water by weight; mixing 100 kg of waste paper pulp with 2.8 kg of modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers;

[0084] S3: 1 kg of pulp fiber is mixed with 20 kg of water to obtain pulp slurry, and sheeting is performed to obtain base paper.

[0085] Experiment: The base papers prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were tested, and the experimental results are shown in the following table.

[0086] Hydrophilic and hydrophobic performance test: measure the contact angle of the base paper surface;

[0087] Tensile performance: Use a vertical computer tensile tester to test the tensile strength of the paper sample according to the procedures and methods specified in the national standard GB / T453-2002, and convert it into a tensile index;

[0088] Water absorption: Test the water absorption of paper according to GB / T1540 Determination of water absorption of paper and paperboard (Cobber method);

[0089]

[0090]

[0091] Conclusion: The data of Examples 1 to 6 show that the base paper prepared by the present invention has good performance, the surface contact angle of the base paper is greater than 100°, and the tensile index is greater than 63Nmg -1 , water absorption less than 100gm-2 .

[0092] The data of Example 1 and Comparative Example 1 show that the waste paper pulp is modified by adding a terpolymer of chitosan, acryloyloxyethyl trimethyl ammonium chloride and lauryl acrylate, thereby improving the tensile properties of the base paper; since chitosan and acryloyloxyethyl trimethyl ammonium chloride are both hydrophilic, the hydrophobic monomer lauryl acrylate is added to modify them, thereby reducing the water absorption performance of the paper. The data of Example 2 and Comparative Example 2 show that by reducing the lauryl acrylate in the modified chitosan, the water absorption of the paper increases, and the surface hydrophobicity increases slightly. The data of Example 3 and Comparative Example 3 show that the adsorption effect of chitosan and acryloyloxyethyl trimethyl ammonium chloride on lignin sulfonate is used to form a self-assembled hydrophobic layer on the surface of pulp fibers, which can effectively reduce the hydrophilicity of the paper surface.

[0093] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A manufacturing process for preparing base paper using waste paper pulp, characterized in that: The following steps are involved: Step 1: Dissolving chitosan in acetic acid solution to obtain a chitosan solution; mixing the chitosan solution, lauryl acrylate and acryloyloxyethyl trimethyl ammonium chloride and heating them, adding potassium persulfate under a nitrogen environment, sealing and stirring the mixture for reaction, and then cooling the mixture to obtain a modified chitosan; Step 2: S1: mixing sodium carbonate, polysiloxane and sodium polyacrylate to obtain a compounding auxiliary agent; S2: after mixing waste paper and water, adding compound auxiliary agent, stirring to obtain waste paper pulp; mixing the waste paper pulp with modified chitosan to obtain mixed pulp; dissociating the mixed pulp into filamentous fibers, removing impurities to obtain pulp fibers; S3: Soaking pulp fibers in a lignin sulfonate solution, air-drying and then repeating the above soaking operation for 3 to 5 times, taking out and rinsing with deionized water, and drying to obtain modified pulp fibers; mixing the modified pulp fibers with water to obtain a modified pulp slurry, and making sheets to obtain base paper.

2. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In step 1, the specific preparation method of the modified chitosan is: dissolving chitosan in acetic acid solution to obtain a chitosan solution with a mass concentration of 2 to 3%; mixing the chitosan solution, lauryl acrylate and acryloyloxyethyltrimethylammonium chloride, heating to 50 to 80° C., adding potassium persulfate under a nitrogen environment, sealing and stirring the reaction for 2 to 4 hours, cooling, and obtaining the modified chitosan.

3. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In step 1, the contents of the components in the modified chitosan are, by weight percentage, 10-20% chitosan, 30-40% acryloyloxyethyltrimethylammonium chloride, and 40-60% lauryl acrylate.

4. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In S1, the contents of the components in the compound auxiliary agent are, by weight percentage, 20-35% sodium carbonate, 35-40% polysiloxane, and 30-40% sodium polyacrylate.

5. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In S2, the content of each component in the waste paper pulp is, by weight percentage, 12-15% waste paper, 1-3% compounding additive, and the rest is water.

6. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In S2, the content of each component in the mixed slurry is, by weight, 100 parts of waste paper slurry and 2.2 to 3.5 parts of modified chitosan.

7. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In S3, pulp fibers are immersed in a lignin sulfonate solution at a bath ratio of 1:25-30.

8. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: The pH value of the lignin sulfonate solution in S3 is 10-12.

9. The manufacturing process for preparing base paper from waste paper pulp according to claim 1, characterized in that: In S3, the contents of the components in the modified pulp slurry are, by weight, 1 to 1.5 parts of modified pulp fiber and 5 to 8 parts of water.

10. Base paper manufactured by the manufacturing process for preparing base paper using waste paper pulp according to any one of claims 1 to 9.

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