Antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil, preparation method and application thereof

Abstract

The present application provides an antibacterial, antioxidant, and flame-retardant aqueous plastic replacement oil, as well as a preparation method and application thereof. The oil is composed of the following components: 45-90% aqueous polyurethane emulsion, 5-20% aqueous acrylic emulsion, 1-10% antibacterial, antioxidant, and flame-retardant prepolymer, 0.2-2% dispersant, 0.5-2% defoamer, and the remainder is water. A specific antibacterial, antioxidant, and flame-retardant functional prepolymer (GO@TP@CS) is used, and graphene oxide is embedded in tea polyphenols. Chitosan is further covalently linked to improve the dispersibility of graphene, thereby solving the technical problem of poor compatibility between the graphene matrix and the aqueous plastic replacement oil. This not only effectively prevents the agglomeration of graphene, but also greatly improves the antibacterial, antioxidant, and flame-retardant properties of the aqueous plastic replacement oil.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly inks, and in particular to an antibacterial, antioxidant, and flame-retardant water-based plastic-replacing oil, and a preparation method and application thereof. Background Art

[0002] The existing lamination process is to print ink on the paper substrate, and then laminate BOPP film or PE film (the film has been prepared with matte or tactile effects) through glue.

[0003] For the ink industry, UV varnishes and inks reduce VOC emissions to almost zero, maximizing protection for the environment and workers' health. Although UV varnishes and inks are green and environmentally friendly, the printed ink layer is difficult to recycle after being applied to various packaging products. It also provides a habitat for the growth of bacteria and microorganisms, posing a potential threat to people's health. People have a deeper understanding of health and safety and are eager for inks and UV varnishes to have certain antibacterial properties to build a safety line for people's production and life. Food oxidation (oxidation of nutrients such as lipids, proteins, pigments, and vitamins) is one of the main causes of food quality deterioration during storage. The antioxidant properties of water-based plastic substitutes on packaging materials and surfaces prevent food oxidation, thereby extending the product's storage period. Combined with environmental protection requirements, antibacterial and antioxidant water-based plastic substitutes have emerged.

[0004] Antibacterial, antioxidant and flame retardant properties have broad application prospects. Many scientific research institutions, enterprises and colleges at home and abroad have carried out a lot of research. However, current research at home and abroad mainly focuses on the development of single antibacterial and flame retardant properties. There are no reports on water-based plastic substitutes with multiple functionalities of antibacterial, antioxidant and flame retardant properties.

[0005] In the current plastic replacement process, the physical properties of plastic replacement oil materials such as folding resistance and tear resistance are relatively worse than those of polymers such as films. Graphene is one of the strongest materials known. Graphene is sp 2 Hybrid carbon nanostructures, consisting of two-dimensional honeycomb planes with a thickness of one carbon atom, possess advantages such as high strength, compact structure, strong physical shielding, stable chemical properties, and a large specific surface area. However, the strong van der Waals forces and π-π double bonds between graphene sheets, as well as their inherent high specific surface area, result in strong hydrophobicity and low dispersibility, limiting their practical applications. Therefore, addressing the issues of graphene dispersion and interface in water-based plastic substitutes is crucial, leading to the development of water-based plastic substitutes with both antibacterial, antioxidant, and flame-retardant properties, which is of significant practical significance. Summary of the Invention

[0006] The present invention aims to address the problems in the current plastic replacement process, such as the physical properties of the plastic replacement oil material, such as folding resistance and tear resistance, being inferior to those of high molecular polymers such as films, the lack of antibacterial, antioxidant and flame retardant properties, and the poor compatibility of graphene with water-based plastic replacement oil. The invention provides a preparation method and application of an antibacterial, antioxidant and flame retardant water-based plastic replacement oil.

[0007] The second object of the present invention is to provide a method for preparing an antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil that is easy to operate.

[0008] In order to achieve the above first purpose, the technical solution adopted by the present invention is:

[0009] An antibacterial, antioxidant, and flame-retardant water-based plastic-replacing oil, comprising the following components by weight: 45-90% water-based polyurethane emulsion, 5-20% water-based acrylic emulsion, 1-10% antibacterial, antioxidant, and flame-retardant prepolymer, 0.2-2% dispersant, 0.5-2% defoamer, and the balance water;

[0010] The antibacterial, antioxidant, and flame-retardant prepolymer is graphene oxide GO@TP@CS modified with tea polyphenols and chitosan in a synergistic manner. Through the covalent bond modification of graphene, the introduced tea polyphenols and chitosan can improve the antibacterial, antioxidant, and compatibility properties, effectively improve the dispersibility of graphene in the aqueous plastic replacement oil, and impart antibacterial, antioxidant, and flame-retardant properties to the aqueous plastic replacement oil. The aqueous plastic replacement oil of the present invention uses an aqueous polyurethane emulsion, which can reduce the use of organic solvents, lower costs, and reduce environmental pollution.

[0011] The raw materials used to prepare and extract tea polyphenols (TP) and chitosan (CS) are widely available and abundant in nature. As green, environmentally friendly, and renewable materials, their abundant surface functional groups, when combined with other substances, can effectively remove heavy metals, dyes, and other organic pollutants. Tea polyphenols possess antibacterial and antioxidant properties, while chitosan also has antimicrobial effects. The synergistic effect of these two greatly enhances the antibacterial and antioxidant properties of the materials, thereby reducing the spread of disease, preventing oxidation, and extending the shelf life of products.

[0012] Preferably, the method for preparing the antibacterial, antioxidant and flame-retardant prepolymer comprises the following steps:

[0013] S1. adding the graphene oxide dispersion to a deionized water solution of tea polyphenols, ultrasonicating at a power of 100 to 325 W for 1 to 5 hours, filtering, washing, and drying to obtain tea polyphenol-modified graphene oxide;

[0014] S2. Add chitosan acetic acid solution to the tea polyphenol-modified graphene oxide obtained in step S1, ultrasonicate at a power of 100-325 W for 1-5 hours, filter, wash, and dry to obtain an antibacterial, antioxidant, and flame-retardant prepolymer.

[0015] Preferably, in step S1, the volume ratio of the graphene oxide to the tea polyphenols is 1:1 to 1:5; in step S2, the volume ratio of the tea polyphenol-modified graphene oxide to the chitosan acetic acid solution is 1:1 to 1:5.

[0016] Preferably, in step S1, the concentration of the graphene oxide is 1 to 5 mg / mL; the concentration of the tea polyphenols is 5 to 15 mg / mL.

[0017] Preferably, in step S2, the mass percentage of acetic acid in the chitosan acetic acid solution is 1-5%.

[0018] Preferably, in the graphene oxide modified synergistically with tea polyphenols and chitosan, the concentration of the graphene oxide modified with tea polyphenols is 1 to 5 mg / mL.

[0019] Preferably, in step S1, the vacuum drying condition is drying at a temperature of 25 to 100° C. for 4 to 20 hours; in step S2, the vacuum drying condition is drying at a temperature of 25 to 100° C. for 4 to 20 hours.

[0020] Preferably, the dispersant is any one of sodium lignin sulfonate, sodium alkyl sulfonate, sodium alkylbenzene sulfonate, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether ammonium sulfate, or a mixture of two or more thereof; and the defoamer is an organosilicon defoamer.

[0021] In order to achieve the above second purpose, the technical solution adopted by the present invention is:

[0022] A method for preparing the antibacterial, antioxidant, and flame-retardant aqueous plastic-replacing oil as described in any one of the above items comprises the following steps: mixing an aqueous polyurethane emulsion, an aqueous acrylic emulsion, and an antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS and uniformly dispersing them at a rotation speed of 1200 to 1600 rpm to obtain a semi-finished product;

[0023] A dispersant, a defoaming agent and deionized water are added to the semi-finished product respectively, and stirred at a speed of 800 to 1000 rpm until uniformly dispersed to obtain an antibacterial, antioxidant and flame-retardant water-based plastic replacement oil. Compared with conventional water-based plastic replacement oils, the prepared water-based plastic replacement oil has antibacterial, antioxidant and flame-retardant functions, and at the same time enhances folding resistance and wear resistance.

[0024] The antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil prepared by the preparation method described above is used in paper packaging and book packaging products.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The present application provides an antibacterial, antioxidant and flame-retardant water-based plastic substitute oil, which adopts a specific antibacterial, antioxidant and flame-retardant functional prepolymer (GO@TP@CS), uses tea polyphenols to embed graphene oxide, and further covalently links chitosan to improve the dispersibility of graphene, thereby solving the technical problem of poor compatibility between the graphene matrix and the water-based plastic substitute oil. It not only effectively prevents the agglomeration of graphene, but also greatly improves the antibacterial, antioxidant and flame-retardant properties of the water-based plastic substitute oil.

[0027] 2. The present application provides a method for preparing an antibacterial, antioxidant and flame-retardant water-based plastic substitute oil, which is simple to operate. The prepared water-based plastic substitute oil has antibacterial, antioxidant and flame-retardant functions, while enhancing folding resistance and wear resistance, and solves the problems of poor compatibility and difficulty in dispersion when graphene is added to the water-based plastic substitute oil matrix. The prepared antibacterial, antioxidant and flame-retardant water-based plastic substitute oil has the advantages of small addition amount and good antibacterial, antioxidant and flame-retardant effects, which greatly improves the antibacterial, antioxidant and flame-retardant properties of the water-based plastic substitute oil.

[0028] 3. The application of an antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil provided in this application can be used in paper packaging and book packaging products. It is environmentally friendly and odorless, and has antibacterial, antioxidant and flame-retardant properties. DETAILED DESCRIPTION

[0029] The specific technical solutions of the present invention are described below in conjunction with specific embodiments:

[0030] Example 1:

[0031] (1) Preparation of GO@TP@CS:

[0032] 0.05 g of GO was added to 50 mL of ethanol and ultrasonically dispersed in an ultrasonic cleaner for 1 h at a temperature of 15 °C and a power of 135 W to obtain a uniform GO ethanol dispersion with a concentration of 1 mg / mL.

[0033] (2) 10 mL of 10 mg / mL TP deionized water solution (GO:TP=1:2, w / w) was added to the dispersion, and the mixture was ultrasonically cleaned for 2 h. The mixture was filtered and washed to obtain a brown solid. The obtained solid was ultrasonically dispersed again in 50 mL of deionized water and vacuum dried at 60°C to obtain tea polyphenol-modified graphene oxide TP-GO.

[0034] (3) Take an appropriate amount of chitosan and add it to a 3 wt% acetic acid solution. Add the chitosan acetic acid solution (CS) to the above GO@TP dispersion at a ratio of 1:1, ultrasonicate for 2 h at a power of 125 W, filter, wash, and dry to prepare GO@TP@CS.

[0035] (4) Preparation of water-based plastic replacement oil:

[0036] An aqueous polyurethane emulsion, an aqueous acrylic emulsion, and an antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS were mixed according to the proportions in Table 1 and uniformly dispersed at a rotation speed of 1200 rpm to obtain a semi-finished product; a dispersant, a defoaming agent, and deionized water were respectively added to the semi-finished product, and the mixture was stirred at a rotation speed of 800 rpm until uniformly dispersed to obtain an antibacterial, antioxidant, and flame-retardant aqueous plastic replacement oil.

[0037] Example 2:

[0038] (1) Preparation of GO@TP@CS:

[0039] 0.05 g of GO was added to 50 mL of ethanol and ultrasonically dispersed in an ultrasonic cleaner for 1 h at a temperature of 15 °C and a power of 135 W to obtain a uniform GO ethanol dispersion with a concentration of 1 mg / mL.

[0040] (2) 10 mL of 10 mg / mL TP deionized water solution (GO:TP=1:3, w / w) was added to the dispersion, and the mixture was ultrasonically cleaned for 2 h. The mixture was filtered and washed to obtain a brown solid. The obtained solid was ultrasonically dispersed again in 50 mL of deionized water and vacuum dried at 60°C to obtain tea polyphenol-modified graphene oxide TP-GO.

[0041] (3) Take an appropriate amount of chitosan and add it to a 3 wt% acetic acid solution. Add the chitosan acetic acid solution (CS) to the above GO@TP dispersion at a ratio of 1:1, ultrasonicate for 1 h at a power of 100 W, filter, wash, and dry to prepare GO@TP@CS.

[0042] (4) Preparation of water-based plastic replacement oil:

[0043] An aqueous polyurethane emulsion, an aqueous acrylic emulsion, and an antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS were mixed according to the proportions in Table 1 and uniformly dispersed at a rotation speed of 1400 rpm to obtain a semi-finished product; a dispersant, a defoaming agent, and deionized water were respectively added to the semi-finished product, and the mixture was stirred at a rotation speed of 1000 rpm until uniformly dispersed to obtain an antibacterial, antioxidant, and flame-retardant aqueous plastic replacement oil.

[0044] Example 3:

[0045] (1) Preparation of GO@TP@CS:

[0046] 0.05 g of GO was added to 50 mL of ethanol and ultrasonically dispersed in an ultrasonic cleaner for 1 h at a temperature of 15 °C and a power of 135 W to obtain a uniform GO ethanol dispersion with a concentration of 1 mg / mL.

[0047] (2) 10 mL of 10 mg / mL TP deionized water solution (GO:TP=1:5, w / w) was added to the dispersion, and the mixture was ultrasonically cleaned for 2 h. The mixture was filtered and washed to obtain a brown solid. The obtained solid was ultrasonically dispersed again in 50 mL of deionized water and vacuum dried at 60°C to obtain tea polyphenol-modified graphene oxide TP-GO.

[0048] (3) Take an appropriate amount of chitosan and add it to a 3 wt% acetic acid solution. Add the chitosan acetic acid solution (CS) to the above GO@TP dispersion at a ratio of 1:1, ultrasonicate for 3 h at a power of 130 W, filter, wash, and dry to prepare GO@TP@CS.

[0049] (4) Preparation of water-based plastic replacement oil:

[0050] An aqueous polyurethane emulsion, an aqueous acrylic emulsion, and an antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS were mixed according to the proportions in Table 1 and uniformly dispersed at a rotation speed of 1500 rpm to obtain a semi-finished product; a dispersant, a defoaming agent, and deionized water were respectively added to the semi-finished product, and the mixture was stirred at a rotation speed of 900 rpm until uniformly dispersed to obtain an antibacterial, antioxidant, and flame-retardant aqueous plastic replacement oil.

[0051] Example 4:

[0052] (1) Preparation of GO@TP@CS:

[0053] 0.05 g of GO was added to 50 mL of ethanol and ultrasonically dispersed in an ultrasonic cleaner for 1 h at a temperature of 15 °C and a power of 135 W to obtain a uniform GO ethanol dispersion with a concentration of 1 mg / mL.

[0054] (2) 10 mL of 10 mg / mL TP deionized water solution (GO:TP=1:4, w / w) was added to the dispersion, and the mixture was ultrasonically cleaned for 2 h. The mixture was filtered and washed to obtain a brown solid. The obtained solid was ultrasonically dispersed again in 50 mL of deionized water and vacuum dried at 60°C to obtain tea polyphenol-modified graphene oxide TP-GO.

[0055] (3) Take an appropriate amount of chitosan and add it to a 3 wt% acetic acid solution. Add the chitosan acetic acid solution (CS) to the above GO@TP dispersion at a ratio of 1:1, ultrasonicate for 5 h at a power of 300 W, filter, wash, and dry to prepare GO@TP@CS.

[0056] (4) Preparation of water-based plastic replacement oil:

[0057] The aqueous polyurethane emulsion, the aqueous acrylic emulsion, and the antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS were mixed according to the proportions in Table 1 and uniformly dispersed at a rotation speed of 1200 to 1600 rpm to obtain a semi-finished product; a dispersant, a defoaming agent, and deionized water were respectively added to the semi-finished product, and the mixture was stirred at a rotation speed of 800 to 1000 rpm until uniformly dispersed to obtain an antibacterial, antioxidant, and flame-retardant aqueous plastic-replacing oil.

[0058] Example 5:

[0059] (1) Preparation of GO@TP@CS:

[0060] 0.05 g of GO was added to 50 mL of ethanol and ultrasonically dispersed in an ultrasonic cleaner for 1 h at a temperature of 15 °C and a power of 135 W to obtain a uniform GO ethanol dispersion with a concentration of 1 mg / mL.

[0061] (2) 10 mL of 10 mg / mL TP deionized water solution (GO:TP=1:2, w / w) was added to the dispersion, and the mixture was ultrasonically cleaned for 2 h. The mixture was filtered and washed to obtain a brown solid. The obtained solid was ultrasonically dispersed again in 50 mL of deionized water and vacuum dried at 60°C to obtain tea polyphenol-modified graphene oxide TP-GO.

[0062] (3) Take an appropriate amount of chitosan and add it to a 3 wt% acetic acid solution. Add the chitosan acetic acid solution (CS) to the above GO@TP dispersion at a ratio of 1:1, ultrasonicate for 5 h at a power of 325 W, filter, wash, and dry to prepare GO@TP@CS.

[0063] (4) Preparation of water-based plastic replacement oil:

[0064] An aqueous polyurethane emulsion, an aqueous acrylic emulsion, and an antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS were mixed according to the proportions in Table 1 and uniformly dispersed at a rotation speed of 1600 rpm to obtain a semi-finished product; a dispersant, a defoaming agent, and deionized water were respectively added to the semi-finished product, and the mixture was stirred at a rotation speed of 1000 rpm until uniformly dispersed to obtain an antibacterial, antioxidant, and flame-retardant aqueous plastic replacement oil.

[0065] Example 6:

[0066] (1) Preparation of GO@TP@CS:

[0067] 0.05 g of GO was added to 50 mL of ethanol and ultrasonically dispersed in an ultrasonic cleaner for 1 h at a temperature of 15 °C and a power of 135 W to obtain a uniform GO ethanol dispersion with a concentration of 1 mg / mL.

[0068] (2) 10 mL of 10 mg / mL TP deionized water solution (GO:TP=1:2, w / w) was added to the dispersion, and the mixture was ultrasonically cleaned for 2 h. The mixture was filtered and washed to obtain a brown solid. The obtained solid was ultrasonically dispersed again in 50 mL of deionized water and vacuum dried at 60°C to obtain tea polyphenol-modified graphene oxide TP-GO.

[0069] (3) Take an appropriate amount of chitosan and add it to a 3 wt% acetic acid solution. Add the chitosan acetic acid solution (CS) to the above GO@TP dispersion at a ratio of 1:1, ultrasonicate for 3 h at a power of 320 W, filter, wash, and dry to prepare GO@TP@CS.

[0070] (4) Preparation of water-based plastic replacement oil:

[0071] The aqueous polyurethane emulsion, the aqueous acrylic emulsion, and the antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS were mixed according to the proportions in Table 1 and uniformly dispersed at a rotation speed of 1200 to 1600 rpm to obtain a semi-finished product; a dispersant, a defoaming agent, and deionized water were respectively added to the semi-finished product, and the mixture was stirred at a rotation speed of 800 to 1000 rpm until uniformly dispersed to obtain an antibacterial, antioxidant, and flame-retardant aqueous plastic-replacing oil.

[0072] Comparative Example:

[0073] Preparation of water-based plastic replacement oil:

[0074] The aqueous polyurethane emulsion and the aqueous acrylic emulsion were mixed according to the proportions in Table 1 and dispersed evenly at a rotation speed of 1200 rpm to obtain a semi-finished product; a dispersant, a defoaming agent and deionized water were added to the semi-finished product respectively, and stirred at a rotation speed of 800 rpm until uniformly dispersed to obtain an antibacterial, antioxidant and flame-retardant aqueous plastic replacement oil.

[0075] Table 1: Percentage of components of antibacterial, antioxidant and flame-retardant water-based plastic-replacing oils of Examples 1-6 and Comparative Examples (%)

[0076] Components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example Waterborne polyurethane emulsion 75 90 45 75 75 75 75 Water-based acrylic emulsion 12 7.8 20 12 12 12 12 GO@TP@CS 1 1 1 3 5 5 - Sodium lignin sulfonate 0.5 0.2 1.5 0.5 0.5 0.5 0.5 Silicone defoamer 0.75 1 0.5 0.75 0.75 0.75 0.75 water 10.75 0 32 8.75 6.75 6.75 11.75

[0077] The water-based plastic replacement oils prepared in Examples 1-6 and the comparative example were tested for adhesion (after curing the water-based plastic replacement oil on gray cardboard, repeatedly adhered to the gray cardboard with 3M 600 tape and peeled off at a 90° angle, recording the number of times the film peeled off), abrasion resistance (tested using a 4-pound abrasion tester, recording the number of times a scratch appeared), and rub resistance (tested using a 10 μm wire rod coated with the water-based plastic replacement oil, then folded, recording the number of times a fold appeared to crack). The results are shown in Table 2 below.

[0078] Table 2: Test results

[0079]

[0080] As can be seen from the results in Table 2, the addition of the specific antibacterial, antioxidant, and flame-retardant prepolymer GO@TP@CS in the present invention can significantly improve adhesion, friction resistance, and rub resistance compared to the comparative example. The reason is that graphene is one of the strongest known materials and also has good toughness and can be bent. The theoretical Young's modulus of graphene reaches 1.0 TPa, and the inherent tensile strength is 130 GPa.

[0081] The antibacterial, antioxidant, and flame-retardant water-based plastic-replacement oils of Examples 1, 4 to 6, and the comparative example, as well as the comparative example 1 (water-based plastic-replacement oil), were coated on a paper substrate to test their antibacterial and flame-retardant properties. The test items and test results are shown in Table 3 below.

[0082] Table 3: Antibacterial and flame retardant performance test results

[0083]

[0084] From the test results in the experimental table, it can be seen that the antibacterial rates of the aqueous plastic replacement oils added with GO@TP@CS in Examples 1, 4 to 6 of the present application are all above 80%. Among them, when the GO@TP@CS content is 5wt% or above, the antibacterial rates are all above 99.99%. In contrast, the antibacterial rate of Comparative Example 1, which does not add GO@TP@CS, is only 23.75%, indicating that the addition of GO@TP@CS greatly improves the antibacterial properties of the aqueous plastic replacement oil.

[0085] In Examples 1, 4, and 6 of the present application, GO@TP@CS was added to the water-based plastic-replacement oil. After two 10-second combustion tests on the test samples, the flame was extinguished within 15 seconds, while the flame of Comparative Example 1, which did not add GO@TP@CS, was extinguished in 53 seconds, indicating that its flame retardant effect was average. The water-based plastic-replacement oil coated with the formula of adding GO@TP@CS in the present application had a good flame retardant effect and achieved the expected effect.

[0086] After adding GO@TP@CS, the physical properties of the water-based plastic replacement oil (such as adhesion, friction resistance, and flexibility) all meet application standards, while also exhibiting excellent flexibility and adhesion, as well as good friction resistance. This application utilizes the excellent flame retardant and antibacterial properties of GO@TP@CS to improve the antibacterial, antioxidant, and flame retardant effects of the water-based plastic replacement oil. The resulting water-based plastic replacement oil has excellent antibacterial, antioxidant, and flame retardant effects, which will address the technical issues currently encountered by similar water-based plastic replacement oils in China, such as low antibacterial efficiency and lack of flame retardancy.

[0087] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil, characterized in that: The invention is composed of the following components by weight percentage: 45-90% aqueous polyurethane emulsion, 5-20% aqueous acrylic emulsion, 1-10% antibacterial, antioxidant and flame retardant prepolymer, 0.2-2% dispersant, 0.5-2% defoaming agent and the balance water; The antibacterial, antioxidant and flame-retardant prepolymer is graphene oxide GO@TP@CS modified by tea polyphenols and chitosan; The method for preparing the antibacterial, antioxidant and flame-retardant prepolymer comprises the following steps: S1. adding the graphene oxide dispersion to a deionized water solution of tea polyphenols, ultrasonicating at a power of 100 to 325 W for 1 to 5 hours, filtering, washing, and drying to obtain tea polyphenol-modified graphene oxide; S2. Add chitosan acetic acid solution to the tea polyphenol-modified graphene oxide obtained in step S1, ultrasonicate at a power of 100 to 325 W for 1 to 5 hours, filter, wash, and dry to obtain an antibacterial, antioxidant, and flame-retardant prepolymer; tea polyphenols are embedded in the graphene oxide and covalently linked to chitosan; In step S1, the volume ratio of the graphene oxide to the tea polyphenols is 1:2 to 1:5; In step S2, the volume ratio of the tea polyphenol-modified graphene oxide to the chitosan acetic acid solution is 1:1 to 1:5; In step S1, the concentration of the graphene oxide is 1 to 5 mg / mL; the concentration of the tea polyphenols is 5 to 15 mg / mL; In step S2, the mass percentage of acetic acid in the chitosan acetic acid solution is 1-5%; In the tea polyphenol and chitosan synergistically modified graphene oxide, the concentration of the tea polyphenol modified graphene oxide is 1 to 5 mg / mL; In step S1, the vacuum drying condition is drying at a temperature of 25 to 100° C. for 4 to 20 hours; in step S2, the vacuum drying condition is drying at a temperature of 25 to 100° C. for 4 to 20 hours; The dispersant is any one of sodium lignin sulfonate, sodium alkyl sulfonate, sodium alkylbenzene sulfonate, alkylphenol polyoxyethylene ether, and fatty alcohol polyoxyethylene ether ammonium sulfate, or a mixture of two or more thereof; the defoamer is an organosilicon defoamer; The preparation method of the antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil comprises the following steps: mixing a water-based polyurethane emulsion, a water-based acrylic emulsion and an antibacterial, antioxidant and flame-retardant prepolymer GO@TP@CS and uniformly dispersing them at a rotation speed of 1200 to 1600 rpm to obtain a semi-finished product; A dispersant, a defoaming agent and deionized water are respectively added to the semi-finished product, and the mixture is stirred at a rotation speed of 800 to 1000 rpm until the mixture is uniformly dispersed to obtain an antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil.

2. The antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil according to claim 1, characterized in that: The antibacterial, antioxidant and flame-retardant water-based plastic-replacing oil prepared by the preparation method is used in paper packaging and book packaging products.

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