A packaging box with antibacterial and antiseptic effects and preparation method thereof

Abstract

The present invention relates to a packaging box with antibacterial and antiseptic effects and a preparation method thereof, and belongs to the technical field of packaging boxes. The preparation method provided by the present invention comprises the following steps: (1) after polishing the surface of the packaging box substrate with 300 mesh sandpaper, cleaning the surface, spraying a water-repellent capsule solution on the surface of the substrate, and drying to obtain a first coating layer; (2) coating the first coating layer with an antibacterial and antiseptic liquid, and drying to obtain a second coating layer; (3) coating the second coating layer with a curing liquid, and curing to obtain a packaging box with antibacterial and antiseptic effects. The present invention improves the bonding force between the substrate surface, the first coating layer, and the second coating layer by applying a water-repellent capsule solution, an antibacterial and antiseptic liquid, and a curing liquid, thereby effectively inhibiting the growth and reproduction of microorganisms, and exerting antibacterial and antiseptic effects.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging boxes, and relates to a packaging box with antibacterial and antiseptic effects and a preparation method thereof. Background Art

[0002] From daily necessities to gifts for festivals, packaging boxes are needed. Packaging boxes are widely used in production and life practices. With the diversity of packaged products and the complexity of use and transportation scenarios, consumers have higher and higher performance requirements for packaging boxes, especially the antibacterial and antiseptic effects of packaging boxes. Although some manufacturers spray or apply antibacterial agents and antiseptic ingredients on the surface of packaging boxes, problems such as uneven coating and poor adhesion are prone to occur. In addition, the high-temperature treatment required during the production of packaging boxes may affect the activity of antibacterial agents and antiseptic ingredients, thereby failing to play their due antibacterial and antiseptic effects. In addition, the humid environment, friction, collision and extrusion that packaging boxes may face during transportation may cause the antibacterial and antiseptic coating layers to be worn, thereby destroying their sealing performance, making it easy for microorganisms to enter the interior of the packaging box, causing damage or deterioration of items. Summary of the invention

[0003] The purpose of the present invention is to provide a packaging box with antibacterial and antiseptic effects and a preparation method thereof. The present invention applies a water-repellent capsule solution, an antibacterial and antiseptic liquid and a solidifying liquid to improve the bonding force between the substrate surface, the first coating layer and the second coating layer, thereby effectively inhibiting the growth and reproduction of microorganisms and exerting antibacterial and antiseptic effects.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a packaging box with antibacterial and antiseptic effects, the preparation method comprising the following steps:

[0006] (1) After grinding the surface of the packaging box substrate with 300-mesh sandpaper for 10-20 minutes, cleaning the surface, spraying the water-repellent capsule solution on the surface of the substrate, and drying at 60° C. for 1-2 hours to obtain a first coating layer;

[0007] (2) coating the first coating layer with an antibacterial preservative liquid, and drying at 70° C. for 2-3 hours to obtain a second coating layer;

[0008] (3) Coating a curing liquid on the outside of the second coating layer and curing at 100° C. for 2-4 hours to obtain a packaging box with antibacterial and antiseptic effects.

[0009] Furthermore, the preparation method of the water-repellent capsule solution in step (1) is:

[0010] A1. Mix gelatin and deionized water in a mass ratio of 1:5-10, stir at 65-75°C and 100-200 rpm until completely dissolved, and cool to room temperature to obtain a gelatin solution;

[0011] A2. The average particle size of 10-30nm nano zinc oxide was added to the gelatin solution in a ratio of 10-30wt% gelatin solution mass, and after ultrasonic treatment for 22-28min, irradiated under UV light to obtain microcapsules;

[0012] A3. Add 8-22 wt% of the mass of the water-repellent liquid microcapsules into the water-repellent liquid, ultrasonicate for 40-50 min, and let stand for 1-2 h to obtain a water-repellent capsule solution.

[0013] Furthermore, the preparation method of the water-repellent liquid in step A3 is:

[0014] 3-(2,3-epoxypropoxy)propyltrimethoxysilane, polydimethylsiloxane and anhydrous ethanol are mixed in a mass ratio of 1.2-3:2.5-4:4-8, and stirred at a speed of 80-200 rpm for 20-30 minutes to obtain a water-repellent liquid.

[0015] Furthermore, the parameters of the UV light irradiation in step A2 are: UV light wavelength is 365nm, UV light intensity is 20-40mW / cm 2 , the UV light irradiation time is 6-10min; the parameters of the ultrasonic step are: ultrasonic frequency is 50-70kHz, and ultrasonic power is 400-600W.

[0016] Furthermore, the preparation method of the antibacterial preservative liquid in step (2) is:

[0017] Methyl methacrylate, hexadecyl dimethyl ammonium chloride, potassium peroxide and anhydrous ethanol are mixed in a mass ratio of 3.5-5:0.8-1.2:0.05-0.07:10-14, and stirred at 60-80°C for 2-5 hours to obtain a polymer solution, and then 6-9wt% of the polymer solution mass of nano zinc oxide with an average particle size of 40-70nm, 1.3-2.8wt% of the polymer solution mass of nonylphenol polyoxyethylene ether and 0.9-1.5wt% of the polymer solution mass of diethylenetriamine are added, and stirred at a speed of 30-70rmp for 0.5-1.5 hours to obtain an antibacterial preservative solution.

[0018] Furthermore, in step (2), the antibacterial and antiseptic liquid coating treatment is applied twice and the thickness of each coating is 20-40 μm, respectively.

[0019] Furthermore, the curing liquid in step (3) is obtained by mixing bisphenol A epoxy resin, diethylenetriamine and anhydrous ethanol in a mass ratio of 8-12:0.7-0.9:10-18.

[0020] Furthermore, the coating thickness in step (3) is 50-80 μm.

[0021] Beneficial effects of the present invention:

[0022] (1) The polydimethylsiloxane and other ingredients in the water-repellent capsule solution of the present invention can form a hydrophobic network, and the hydrophilic gelatin combines with nano zinc oxide to form microcapsules. The water-repellent liquid blocks water invasion to a certain extent. When the coating is worn or the humidity is too high, the hydrophilic gelatin absorbs water and swells, releasing the encapsulated nano zinc oxide, thereby effectively inhibiting the growth and reproduction of microorganisms in a high humidity environment, thereby exerting an antibacterial and antiseptic effect.

[0023] (2) The double bonds of methyl methacrylate in the antibacterial and preservative liquid of the present invention are opened during the polymerization process to form polymer molecular chains, and the cross-linked structure in the obtained polymer solution can prevent the penetration of bacteria and water; the cationic part of hexadecyl dimethyl ammonium chloride can interact with the anionic groups on the surface of the bacterial cell membrane, resulting in increased permeability of the cell membrane, thereby destroying the cell structure of the bacteria, and the alkyl part of nonylphenol polyoxyethylene ether is hydrophobic, forming a hydrophobic region in the polymer solution. The presence of these two surfactants helps to improve the dispersibility of nano zinc oxide in the polymer solution and enhance the antibacterial and preservative properties of the packaging box; in addition, the polar groups such as hydroxyl groups on the surface of the nano zinc oxide in the antibacterial and preservative liquid may interact with the epoxy groups and siloxane groups in the first coating layer, thereby affecting the uniform distribution and stability of the nano zinc oxide between the two coating layers to a certain extent, and at the same time helping to improve the bonding force between the two coating layers.

[0024] (3) The bisphenol A epoxy resin molecules in the curing liquid of the present invention can form a three-dimensional cross-linked structure with diethylenetriamine, so that the packaging box after coating with the curing liquid has good mechanical strength, corrosion resistance and stability; in addition, the epoxy resin molecules in the third coating layer interact with the polymer molecular chains in the second coating layer through hydrogen bonds and van der Waals forces, so that the third coating layer can be firmly attached to the surface of the second coating layer and is not easy to separate, which helps to stabilize the antibacterial and antiseptic components, thereby extending the service life of the packaging box. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0026] Example 1

[0027] A method for preparing a packaging box with antibacterial and antiseptic effects, the preparation method of this embodiment comprises the following steps:

[0028] (1) After polishing the surface of the paper box with 300-mesh sandpaper for 10 min, the surface was cleaned, and the water-repellent capsule solution was sprayed on the surface of the substrate with a spraying thickness of 50 μm. After drying at 60° C. for 1 h, a first coating layer was obtained;

[0029] (2) coating the first coating layer with an antibacterial preservative liquid, and drying at 70° C. for 2 h to obtain a second coating layer;

[0030] (3) The curing liquid is coated on the outside of the second coating layer, and the curing liquid is cured at 100° C. for 2 hours to obtain a packaging box with antibacterial and antiseptic effects.

[0031] The preparation method of the water-repellent capsule solution of this embodiment in step (1) is:

[0032] A1. Mix gelatin and deionized water in a mass ratio of 1:5, stir at 65°C and 100 rpm until completely dissolved, and cool to room temperature to obtain a gelatin solution;

[0033] A2. The average particle size of 10nm of nano zinc oxide was added to the gelatin solution in a ratio of 10wt% gelatin solution mass, and after ultrasonic treatment for 22min, the microcapsules were obtained under UV light;

[0034] A3. Add 8 wt% of the microcapsules of the water-repellent liquid into the water-repellent liquid, ultrasonicate for 40 min, and let stand for 1 h to obtain a water-repellent capsule solution.

[0035] The preparation method of the water-repellent liquid of this embodiment in step A3 is:

[0036] 3-(2,3-epoxypropoxy)propyltrimethoxysilane, polydimethylsiloxane and anhydrous ethanol were mixed in a mass ratio of 1.2:2.5:4, and stirred at a speed of 80 rpm for 20 minutes to obtain a water-repellent liquid.

[0037] The parameters of the UV light irradiation in step A2 of this embodiment are: UV light wavelength is 365nm, UV light intensity is 20mW / cm 2 , the UV light irradiation time is 6 minutes; the parameters of the ultrasonic step in this embodiment are: the ultrasonic frequency is 50kHz, and the ultrasonic power is 400W.

[0038] The preparation method of the antibacterial preservative liquid of this embodiment in step (2) is:

[0039] Methyl methacrylate, hexadecyldimethylammonium chloride, potassium peroxide and anhydrous ethanol were mixed in a mass ratio of 3.5:0.8:0.05:10, and stirred at 60°C for 2 hours to obtain a polymer solution. Then, 6wt% of the polymer solution mass of nano zinc oxide with an average particle size of 40nm, 1.3wt% of the polymer solution mass of nonylphenol polyoxyethylene ether and 0.9wt% of the polymer solution mass of diethylenetriamine were added, and the mixture was stirred at a speed of 30rmp for 0.5h to obtain an antibacterial preservative solution.

[0040] In step (2), the number of times the antibacterial and antiseptic liquid is applied in this embodiment and the thickness of each application is 2 times and 20 μm respectively.

[0041] In step (3), the curing liquid of this embodiment is obtained by mixing bisphenol A epoxy resin, diethylenetriamine and anhydrous ethanol in a mass ratio of 8:0.7:10; the bisphenol A epoxy resin of this embodiment is hydrogenated bisphenol A epoxy resin.

[0042] The coating thickness in step (3) of this embodiment is 50 μm.

[0043] Example 2

[0044] A method for preparing a packaging box with antibacterial and antiseptic effects, the preparation method of this embodiment comprises the following steps:

[0045] (1) After polishing the surface of the paper box with 300-mesh sandpaper for 20 minutes, the surface was cleaned, and the water-repellent capsule solution was sprayed on the surface of the substrate with a spraying thickness of 50 μm. After drying at 60° C. for 2 hours, a first coating layer was obtained;

[0046] (2) coating the first coating layer with an antibacterial preservative liquid, and drying at 70° C. for 3 h to obtain a second coating layer;

[0047] (3) The curing liquid is coated on the outside of the second coating layer, and the curing liquid is cured at 100° C. for 4 hours to obtain a packaging box with antibacterial and antiseptic effects.

[0048] The preparation method of the water-repellent capsule solution of this embodiment in step (1) is:

[0049] A1. Mix gelatin and deionized water in a mass ratio of 1:10, stir at 75°C and 200 rpm until completely dissolved, and cool to room temperature to obtain a gelatin solution;

[0050] A2. The average particle size of 30nm nano zinc oxide was added to the gelatin solution in a ratio of 30wt% gelatin solution mass, and after ultrasonic treatment for 28min, the microcapsules were obtained under UV light;

[0051] A3. Add 22 wt% of the microcapsules of the water-repellent liquid into the water-repellent liquid, ultrasonicate for 50 min, and let stand for 2 h to obtain a water-repellent capsule solution.

[0052] The preparation method of the water-repellent liquid of this embodiment in step A3 is:

[0053] 3-(2,3-epoxypropoxy)propyltrimethoxysilane, polydimethylsiloxane and anhydrous ethanol were mixed in a mass ratio of 3:4:8, and stirred at a speed of 200 rpm for 30 minutes to obtain a water-repellent liquid.

[0054] The parameters of the UV light irradiation in step A2 of this embodiment are: UV light wavelength is 365nm, UV light intensity is 40mW / cm 2 , the UV light irradiation time is 10 min; the parameters of the ultrasonic step in this embodiment are: the ultrasonic frequency is 70 kHz, and the ultrasonic power is 600 W.

[0055] The preparation method of the antibacterial preservative liquid of this embodiment in step (2) is:

[0056] Methyl methacrylate, hexadecyl dimethyl ammonium chloride, potassium peroxide and anhydrous ethanol were mixed in a mass ratio of 5:1.2:0.07:14, and stirred at 80°C for 5 hours to obtain a polymer solution. Then, 9wt% of the polymer solution mass of nano zinc oxide with an average particle size of 70nm, 2.8wt% of the polymer solution mass of nonylphenol polyoxyethylene ether and 1.5wt% of the polymer solution mass of diethylenetriamine were added, and the mixture was stirred at a speed of 70rmp for 1.5 hours to obtain an antibacterial preservative solution.

[0057] In step (2), the number of times the antibacterial and antiseptic liquid is applied in this embodiment and the thickness of each application is 2 times and 40 μm, respectively.

[0058] In step (3), the curing liquid of this embodiment is obtained by mixing bisphenol A epoxy resin, diethylenetriamine and anhydrous ethanol in a mass ratio of 12:0.9:18; the bisphenol A epoxy resin of this embodiment is hydrogenated bisphenol A epoxy resin.

[0059] The coating thickness in step (3) of this embodiment is 80 μm.

[0060] Example 3

[0061] A method for preparing a packaging box with antibacterial and antiseptic effects, the preparation method of this embodiment comprises the following steps:

[0062] (1) After polishing the surface of the paper box with 300-grit sandpaper for 15 minutes, the surface was cleaned, and the water-repellent capsule solution was sprayed on the surface of the substrate with a spraying thickness of 50 μm. After drying at 60° C. for 1.5 hours, a first coating layer was obtained;

[0063] (2) coating the first coating layer with an antibacterial preservative liquid, and drying at 70° C. for 2.5 h to obtain a second coating layer;

[0064] (3) The curing liquid is coated on the outside of the second coating layer, and the curing liquid is cured at 100° C. for 3 hours to obtain a packaging box with antibacterial and antiseptic effects.

[0065] The preparation method of the water-repellent capsule solution of this embodiment in step (1) is:

[0066] A1. Mix gelatin and deionized water in a mass ratio of 1:7.5, stir at 70°C and 150 rpm until completely dissolved, and cool to room temperature to obtain a gelatin solution;

[0067] A2. The average particle size of 20nm nano zinc oxide was added to the gelatin solution in a ratio of 20wt% gelatin solution mass, and after ultrasonic treatment for 25min, the microcapsules were obtained under UV light;

[0068] A3. Add 15 wt% of the microcapsules of the water-repellent liquid to the water-repellent liquid, ultrasonicate for 45 min, and let stand for 1.5 h to obtain a water-repellent capsule solution.

[0069] The preparation method of the water-repellent liquid of this embodiment in step A3 is:

[0070] 3-(2,3-epoxypropoxy)propyltrimethoxysilane, polydimethylsiloxane and anhydrous ethanol were mixed in a mass ratio of 2.1:3.25:6, and stirred at a speed of 140 rpm for 25 minutes to obtain a water-repellent liquid.

[0071] The parameters of the UV light irradiation in step A2 of this embodiment are: UV light wavelength is 365nm, UV light intensity is 30mW / cm 2 , the UV light irradiation time is 8 minutes; the parameters of the ultrasonic step in this embodiment are: the ultrasonic frequency is 60kHz, and the ultrasonic power is 500W.

[0072] The preparation method of the antibacterial preservative liquid of this embodiment in step (2) is:

[0073] Methyl methacrylate, hexadecyldimethylammonium chloride, potassium peroxide and anhydrous ethanol were mixed in a mass ratio of 4.25:1:0.06:12, and stirred at 70°C for 3.5 hours to obtain a polymer solution. Then, 7.5wt% of the polymer solution mass of nano zinc oxide with an average particle size of 55nm, 2.05wt% of the polymer solution mass of nonylphenol polyoxyethylene ether and 1.2wt% of the polymer solution mass of diethylenetriamine were added, and the mixture was stirred at a speed of 50rmp for 1 hour to obtain an antibacterial preservative solution.

[0074] In step (2), the number of times the antibacterial and antiseptic liquid is applied in this embodiment and the thickness of each application is 2 times and 30 μm, respectively.

[0075] In step (3), the curing liquid of this embodiment is obtained by mixing bisphenol A epoxy resin, diethylenetriamine and anhydrous ethanol in a mass ratio of 10:0.8:14; the bisphenol A epoxy resin of this embodiment is hydrogenated bisphenol A epoxy resin.

[0076] The coating thickness in step (3) of this embodiment is 65 μm.

[0077] Comparative Example 1

[0078] On the basis of Example 3, the sandpaper polishing step in step (1) was removed, and the other conditions were consistent with Example 3.

[0079] Comparative Example 2

[0080] On the basis of Example 3, the water-repellent capsule solution in step (1) was removed and replaced with an equal weight of capsule solution, and the other conditions were the same as those in Example 3;

[0081] The preparation method of the capsule solution of Bili is as follows: adding microcapsules with a mass of 15 wt% of anhydrous ethanol into anhydrous ethanol, ultrasonicating for 45 minutes, and standing for 1.5 hours to obtain a capsule solution.

[0082] Comparative Example 3

[0083] On the basis of Example 3, the polymer solution in the antibacterial preservative solution was removed and replaced with an equal weight of anhydrous ethanol. Other conditions were the same as those in Example 3.

[0084] Comparative Example 4

[0085] On the basis of Example 3, the nonylphenol polyoxyethylene ether in the antibacterial preservative solution was removed and replaced with an equal weight of anhydrous ethanol. Other conditions were the same as those in Example 3.

[0086] Comparative Example 5

[0087] On the basis of Example 3, the diethylenetriamine in the antibacterial preservative solution was removed and replaced with an equal weight of anhydrous ethanol. Other conditions were the same as those in Example 3.

[0088] Comparative Example 6

[0089] On the basis of Example 3, keeping other conditions the same, the preparation method was changed to:

[0090] (1) After polishing the surface of the paper box with 300-grit sandpaper for 15 minutes, the surface was cleaned, and the water-repellent capsule solution was sprayed on the surface of the substrate with a spraying thickness of 50 μm. After drying at 60° C. for 1.5 hours, a first coating layer was obtained;

[0091] (2) Coating a curing liquid onto the outside of the first coating layer and curing at 100° C. for 3 hours to obtain a packaging box with antibacterial and antiseptic effects.

[0092] Comparative Example 7

[0093] On the basis of Example 3, keeping other conditions the same, the preparation method was changed to:

[0094] (1) After polishing the surface of the paper box with 300-grit sandpaper for 15 minutes, the surface was cleaned, and the water-repellent capsule solution was sprayed on the surface of the substrate with a spraying thickness of 50 μm. After drying at 60° C. for 1.5 hours, a first coating layer was obtained;

[0095] (2) coating the first coating layer with an antibacterial and antiseptic liquid, and curing the liquid at 100° C. for 3 h to obtain a packaging box having an antibacterial and antiseptic effect.

[0096] The packaging boxes prepared by the methods described in Examples 1-3 and Comparative Examples 1-7 were used as samples, and holes were punched to obtain discs with a diameter of 6 mm and sterilized with ultraviolet light for 2 hours. Then, 1 mL of a 10 5 CFU / mL of Escherichia coli and Staphylococcus aureus were dropped onto the corresponding culture medium, spread evenly and let stand for 10 minutes to allow the bacterial solution to diffuse completely, observe the growth of the bacteria and measure the diameters of the inhibition zones at 24h and 48h. Separately, take samples and place them in an environment with 80% humidity for three weeks to observe whether the packaging boxes are rotten. The results are recorded as shown in Table 1.

[0097] Table 1

[0098]

[0099] As can be seen from Table 1, the packaging box obtained by the methods of Examples 1-3 of the present invention has a good antibacterial effect, and no rot occurs even in a humid environment for a long time, which is significantly better than the effect presented by Comparative Examples 1-7. Comparative Examples 1, 6 and 7 change the pre-treatment and subsequent coating schemes, so that the adhesion of various treatment liquids on the packaging box and the binding force between the treatment liquids are affected, so the antibacterial and antiseptic effects are weakened; Comparative Examples 2-5 replace the water-repellent capsule solution or change a certain component in the water-repellent capsule solution and the antibacterial and antiseptic solution, and cannot achieve the synergistic effect presented by the present invention, so the antibacterial and antiseptic effects are affected.

[0100] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any indirect modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a packaging box with antibacterial and antiseptic effects, characterized in that: The preparation method comprises the following steps: (1) After grinding the surface of the packaging box substrate with 300-mesh sandpaper for 10-20 minutes, clean the surface, spray the water-repellent capsule solution on the surface of the substrate, and dry it at 60°C for 1-2 hours to obtain the first coating layer; (2) coating the first coating layer with an antibacterial preservative liquid, and drying at 70° C. for 2-3 hours to obtain a second coating layer; (3) Applying a curing liquid to the outside of the second coating layer, and curing at 100° C. for 2-4 hours to obtain a packaging box with antibacterial and antiseptic effects; The preparation method of the water-repellent capsule solution in step (1) is: A1. Mix gelatin and deionized water in a mass ratio of 1:5-10, stir at 65-75°C and 100-200 rpm until completely dissolved, and cool to room temperature to obtain a gelatin solution; A2. The average particle size of 10-30nm nano zinc oxide was added to the gelatin solution in a ratio of 10-30wt% gelatin solution mass, and after ultrasonication for 22-28min, irradiated under UV light to obtain microcapsules; A3. 8-22wt% of the mass of the water-repellent microcapsules was added to the water-repellent liquid, ultrasonicated for 40-50min, and allowed to stand for 1-2h to obtain a water-repellent capsule solution; The preparation method of the water-repellent liquid in step A3 is: 3-(2,3-epoxypropoxy)propyltrimethoxysilane, polydimethylsiloxane and anhydrous ethanol are mixed in a mass ratio of 1.2-3:2.5-4:4-8, and stirred at a speed of 80-200 rpm for 20-30 minutes to obtain a water-repellent liquid; The parameters of the UV light irradiation in step A2 are: UV light wavelength is 365nm, UV light intensity is 20-40mW / cm 2 , the UV light irradiation time is 6-10min; the parameters of the ultrasonic step are: ultrasonic frequency is 50-70kHz, and ultrasonic power is 400-600W.

2. The method for preparing a packaging box with antibacterial and antiseptic effects according to claim 1, characterized in that: The preparation method of the antibacterial preservative liquid in step (2) is: Methyl methacrylate, hexadecyl dimethyl ammonium chloride, potassium peroxide and anhydrous ethanol are mixed in a mass ratio of 3.5-5:0.8-1.2:0.05-0.07:10-14, and stirred at 60-80°C for 2-5 hours to obtain a polymer solution, and then 6-9wt% of the polymer solution mass of nano zinc oxide with an average particle size of 40-70nm, 1.3-2.8wt% of the polymer solution mass of nonylphenol polyoxyethylene ether and 0.9-1.5wt% of the polymer solution mass of diethylenetriamine are added, and stirred at a speed of 30-70rmp for 0.5-1.5 hours to obtain an antibacterial preservative solution.

3. The method for preparing a packaging box with antibacterial and antiseptic effects according to claim 1, characterized in that: The number of times the antibacterial and antiseptic liquid is applied in step (2) and the thickness of each application is 20-40 μm, respectively.

4. The method for preparing a packaging box with antibacterial and antiseptic effects according to claim 1, characterized in that: The curing liquid in step (3) is obtained by mixing bisphenol A epoxy resin, diethylenetriamine and anhydrous ethanol in a mass ratio of 8-12:0.7-0.9:10-18.

5. The method for preparing a packaging box with antibacterial and antiseptic effects according to claim 1, characterized in that: The coating thickness in step (3) is 50-80 μm.

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