An antibacterial and re-pulpable functional paper coating and its preparation method

Abstract

The present invention relates to the technical field of paper coating, and discloses an antibacterial and repulpable functional paper coating and a preparation method thereof. The paper coating is formed by coating a paper coating liquid on the surface of base paper. The paper coating liquid comprises the following raw materials: acrylic acid, isooctyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, an antibacterial modification component, deionized water, azobisisobutyronitrile, a filler, a film-forming aid, a leveling agent, and an antifoaming agent. The antibacterial modification component is obtained by grafting a polymeric intermediate containing guanidine and Schiff base structures onto the surface of zinc oxide, and achieving an organic-inorganic multiple synergistic antibacterial effect in the matrix, so as to effectively improve the antibacterial performance of the paper coating with a small addition amount, and avoid the negative impacts caused by poor antibacterial performance of the paper coating.

Description

Technical Field

[0001] The invention relates to the technical field of paper coatings, and in particular to an antibacterial repulpable functional paper coating and a preparation method thereof. Background Art

[0002] With the rapid economic growth and continuous technological advancement, environmental protection and resource recycling have become core issues in today's social development. People's increasing attention to environmental protection and resource recycling has made the recycling of various resource materials more and more important, such as paper, plastic, rubber, steel and metal products. Among them, paper is a material with a three-dimensional network structure made from plant fibers as the main raw material. It has the advantages of renewable sources, biodegradability, and easy recycling. It can be widely used in the production of packaging paper bags, cartons, paper cups, etc.

[0003] As we all know, paper products generally adopt the method of coating a layer of plastic coating on the surface of base paper to obtain barrier properties against water, oil, etc. At present, most of the paper products on the market are PE coating, but PE coated paper products have problems such as non-degradability, non-repulpability, and difficulty in recycling. The market has gradually replaced it. Due to the advantages of water-based coatings such as recyclability and repulpability, it has been used in paper coating. With the improvement of people's awareness of health and safety, the antibacterial properties of paper products have also received more and more attention. A large number of microorganisms are easily attached to the surface of ordinary paper products, which will not only affect the quality of paper products, but also have a negative impact on the health of consumers. This has greatly restricted the further application of paper products. Therefore, it is urgent to develop a paper coating with good antibacterial properties.

[0004] In the prior art, the patent with the announcement number CN115928501B discloses an antibacterial wrapping paper and a preparation method thereof, wherein the wrapping paper is composed of a wrapping base paper and a hydrophobic antibacterial coating on its surface, wherein the hydrophobic antibacterial coating is obtained by sizing the surface of an antibacterial coating liquid, and the antibacterial property of the coating is improved by adding a multi-effect antibacterial agent and nano zinc oxide to the antibacterial coating liquid, so that the prepared wrapping paper has good antibacterial property. Therefore, by adding optimized components in a targeted manner during the preparation process of the paper coating, the paper coating can be endowed with good antibacterial property. Summary of the invention

[0005] In order to solve the problems mentioned in the background technology, the object of the present invention is to provide an antibacterial repulpable functional paper coating and a preparation method thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An antibacterial and repulpable functional paper coating, which is formed by coating a paper coating solution on the surface of base paper; the paper coating solution comprises raw materials in the following parts by weight: 30-40 parts of acrylic acid, 15-25 parts of isooctyl acrylate, 10-20 parts of glycidyl methacrylate, 5-15 parts of 2-hydroxyethyl methacrylate, 5-8 parts of antibacterial modification component, 40-60 parts of deionized water, 3-5 parts of azobisisobutyronitrile, 8-12 parts of filler, 1-2 parts of film-forming aid, 1-3 parts of leveling agent, 2-3 parts of defoamer.

[0008] Furthermore, the preparation method of the antibacterial modification component comprises the following steps:

[0009] S1: Mix 1,3-diaminoguanidine hydrochloride with dimethyl sulfoxide, pour it into a reaction kettle, start stirring, and after forming a uniform solution, under continuous nitrogen conditions, add 4-hydroxyisophthalaldehyde. After adding, raise the temperature to 50-55 °C, stir at this temperature for 4-9 h, and rotary evaporate to remove the solvent to obtain a polymeric intermediate;

[0010] S2: Under nitrogen protection, mix zinc oxide and N-methylpyrrolidone, and after ultrasonic treatment to form a dispersion, add 2-chloroacrylic acid and catalyst A to the dispersion. Under stirring conditions, raise the temperature of the system to 90-110 °C, keep warm for 5-7 h, then separate the solid material, and after washing and drying, obtain modified zinc oxide;

[0011] S3: Ultrasonically disperse the modified zinc oxide in N,N-dimethylformamide to form a uniform dispersion, pass nitrogen to remove oxygen, add the polymeric intermediate and sodium carbonate solution to the dispersion, start heating, and after the temperature of the system reaches 70-80 °C, stir at a constant temperature for 8-12 h, then filter, collect the product, wash the product, and dry it to obtain the antibacterial modification component.

[0012] Furthermore, in step S2, the average particle size of the zinc oxide is 5 μm.

[0013] Furthermore, in step S2, the catalyst A is any one of tetrabutyl titanate, tetraethyl titanate or tetraisopropyl titanate.

[0014] Furthermore, in step S2, the mass ratio of the zinc oxide to 2-chloroacrylic acid is 1:0.1-0.3.

[0015] Furthermore, in step S3, the mass fraction of the sodium carbonate solution is 5%-30%.

[0016] It can be speculated that the principle of the above solution is as follows: In step S1, taking advantage of the fact that amino groups can react with aldehyde groups, using 1,3-diaminoguanidine hydrochloride and 4-hydroxyisophthalaldehyde as raw materials, continuous Schiff base reactions occur between them, and the molecular chain is continuously extended, ultimately forming a polymeric intermediate with guanidine groups, hydroxyl groups, and Schiff base structures; in step S2, catalyzed by catalyst A, the hydroxyl groups on the surface of zinc oxide react with the carboxyl groups in the 2-chloroacrylic acid structure to introduce halogen functional groups and unsaturated alkenyl functional groups on the surface of zinc oxide, obtaining modified zinc oxide; in step S3, the halogen functional groups on the surface of the modified zinc oxide can undergo substitution reactions with the hydroxyl groups in the structure of the polymeric intermediate under the action of a sodium carbonate solution, thereby grafting the polymeric intermediate onto the surface of zinc oxide to prepare the antibacterial modified component.

[0017] A preparation method of an antibacterial and re-pulpable functional paper coating includes the following steps:

[0018] Step 1: Add acrylic acid, isooctyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, the antibacterial modified component, and deionized water into a reaction kettle, ultrasonically disperse until a uniform liquid material is formed, protect with an inert gas, add azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 60 - 80 °C, keep warm and stir for 1 - 3 h to obtain an acrylic polymer emulsion;

[0019] Step 2: Add a filler, a film-forming aid, a leveling agent, and an antifoaming agent to the acrylic polymer emulsion, stir and mix at a rate of 400 - 600 r / min for 30 - 50 min, stand for defoaming, and discharge to obtain the paper coating liquid;

[0020] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper and cure at room temperature for 2 - 4 h to obtain the paper coating.

[0021] Further, in step 1, in the ultrasonic dispersion, the ultrasonic frequency is 70 - 90 kHz.

[0022] Further, in step 1, the inert gas is any one of argon, neon, or helium.

[0023] Further, in step 2, the filler is any one of talc powder, calcium carbonate, or titanium dioxide; the film-forming aid is any one of propylene glycol, propylene glycol methyl ether, or dipropylene glycol methyl ether; the leveling agent is any one of polybutyl acrylate or polyethyl acrylate; the antifoaming agent is any one of dimethyl silicone oil or fatty alcohol polyoxyethylene ether.

[0024] The beneficial effects of the present invention:

[0025] (1) The present invention uses waterborne acrylic coatings as the matrix of the coating material, which can endow the prepared paper coating with advantages such as recyclability and repulpability, meeting the development concept of environmental protection and resource recycling in today's society. Moreover, the prepared antibacterial modification component is added to the matrix material, effectively improving the antibacterial performance of the paper coating, overcoming the problem of poor antibacterial performance of ordinary paper products, and having broad application prospects.

[0026] (2) The present invention prepares an antibacterial modification component as an additive. Since the antibacterial modification component contains unsaturated alkenyl functional groups, during the polymerization of monomers such as acrylic acid, isooctyl acrylate, and glycidyl methacrylate, it can crosslink with the matrix, enabling the molecular chains of each other to intertwine and fuse, making the paper coating exhibit higher denseness, and at the same time avoiding the precipitation of the antibacterial modification component, thus maintaining long-term antibacterial performance. On the one hand, after organic modification, zinc oxide improves its dispersibility in the matrix, making it less likely to agglomerate during use, and due to its special photocatalytic antibacterial effect, significantly enhancing the antibacterial performance of the paper coating. On the other hand, the antibacterial modification component not only contains guanidine antibacterial agents but also Schiff base structures. Therefore, the dual antibacterial effects of the guanidine group and Schiff base structures can be utilized to endow the prepared paper coating with excellent antibacterial performance, which can cooperate with zinc oxide to produce an organic-inorganic multiple synergistic antibacterial effect, thereby achieving effective improvement of the antibacterial performance of the paper coating with a relatively small addition amount, avoiding the negative impacts caused by poor antibacterial performance of paper products.

[0027] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is the infrared spectrum test chart of the antibacterial modification component prepared in Example 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] Example 1

[0032] I. Preparation of antibacterial modification component

[0033] S1: Mix 2 g of 1,3-diaminoguanidine hydrochloride with dimethyl sulfoxide, pour it into a reaction kettle, start stirring, and after forming a homogeneous solution, add 2.2 g of 4-hydroxyisophthalaldehyde under continuous nitrogen conditions. After adding, raise the temperature to 52 °C, stir at this temperature for 6 h, and remove the solvent by rotary evaporation to obtain a polymeric intermediate;

[0034] S2: Under nitrogen protection, mix 5 g of zinc oxide and N-methylpyrrolidone, and after ultrasonic treatment to form a dispersion, add 1.2 g of 2-chloroacrylic acid and 0.05 g of tetrabutyl titanate to the dispersion. Under stirring conditions, raise the temperature of the system to 100 °C, keep warm for 6 h, then separate the solid material, and after washing and drying, obtain modified zinc oxide;

[0035] S3: Ultrasonically disperse 4 g of modified zinc oxide in N,N-dimethylformamide to form a homogeneous dispersion, pass nitrogen to remove oxygen, add 3.4 g of the polymeric intermediate and 0.1 g of a 20% sodium carbonate solution by mass fraction to the dispersion, start heating, and after the temperature of the system reaches 75 °C, stir at a constant temperature for 10 h, then filter, collect the product, wash the product, and dry it to obtain the antibacterial modification component.

[0036] Use a Thermo Scientific Nicolet IS50 Fourier transform infrared spectrometer to perform infrared spectral analysis on the antibacterial modification component. As Figure 1 shown, it can be seen from Figure 1 that in the infrared spectrum of the antibacterial modification component, an absorption peak of the ester group C=O appears at 1735 cm -1 , an absorption peak of the carbon-hydrogen bond in the carbon-carbon double bond appears at 3015 cm -1 , an absorption peak of the Schiff base C=N appears at 1661 cm -1 , an absorption peak of the carbon-hydrogen bond in the benzene ring appears at 3055 cm -1 , an absorption peak of the ether bond C-O-C appears at 1030 cm -1 , and an absorption peak of the N-H in the guanidine group appears at 3381 cm -1 .

[0037] II. Preparation of paper coating

[0038] Step 1: Add 30 g of acrylic acid, 15 g of isooctyl acrylate, 10 g of glycidyl methacrylate, 5 g of 2-hydroxyethyl methacrylate, 5 g of antibacterial modification component and 40 g of deionized water into a reaction kettle, ultrasonically disperse at an ultrasonic frequency of 70 kHz until a uniform liquid material is formed, protect with argon gas, add 3 g of azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 60 °C, keep warm and stir for 1 - 3 h to obtain an acrylic acid polymerization emulsion;

[0039] Step 2: Add 8 g of talcum powder, 1 g of propylene glycol, 1 g of polyethyl acrylate and 2 g of dimethyl silicone oil into the acrylic acid polymerization emulsion, stir and mix at a rate of 400 r / min for 30 min, stand still to defoam, and discharge to obtain a paper coating liquid;

[0040] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper, cure at room temperature for 2 h to obtain a paper coating.

[0041] Example 2

[0042] Preparation of Paper Coating

[0043] Step 1: Add 35 g of acrylic acid, 20 g of isooctyl acrylate, 15 g of glycidyl methacrylate, 10 g of 2-hydroxyethyl methacrylate, 7 g of antibacterial modification component and 50 g of deionized water into a reaction kettle, ultrasonically disperse at an ultrasonic frequency of 80 kHz until a uniform liquid material is formed, protect with argon gas, add 4 g of azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 70 °C, keep warm and stir for 2 h to obtain an acrylic acid polymerization emulsion;

[0044] Step 2: Add 10 g of talcum powder, 1.5 g of propylene glycol, 2 g of polyethyl acrylate and 2.5 g of dimethyl silicone oil into the acrylic acid polymerization emulsion, stir and mix at a rate of 500 r / min for 40 min, stand still to defoam, and discharge to obtain a paper coating liquid;

[0045] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper, cure at room temperature for 3 h to obtain a paper coating.

[0046] The preparation method of the antibacterial modification component is the same as that in Example 1.

[0047] Example 3

[0048] Preparation of Paper Coating

[0049] Step 1: Add 40 g of acrylic acid, 25 g of isooctyl acrylate, 20 g of glycidyl methacrylate, 15 g of 2-hydroxyethyl methacrylate, 8 g of antibacterial modification component and 60 g of deionized water into a reaction kettle, ultrasonically disperse at an ultrasonic frequency of 90 kHz until a uniform liquid material is formed, protect with argon gas, add 5 g of azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 80 °C, keep warm and stir for 3 h to obtain an acrylic acid polymerization emulsion;

[0050] Step 2: Add 12 g of talcum powder, 2 g of propylene glycol, 3 g of polyethyl acrylate and 3 g of dimethyl silicone oil to the acrylic acid polymerization emulsion, stir and mix at a rate of 600 r / min for 50 min, let stand to defoam, and discharge to obtain a paper coating liquid; 185

[0051] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper and cure at room temperature for 4 h to obtain a paper coating.

[0052] The preparation method of the antibacterial modification component is the same as that in Example 1.

[0053] Comparative Example 1

[0054] Preparation of Paper Coating

[0055] Step 1: Add 35 g of acrylic acid, 20 g of isooctyl acrylate, 15 g of glycidyl methacrylate, 10 g of 2-hydroxyethyl methacrylate, 7 g of zinc oxide and 50 g of deionized water into a reaction kettle, ultrasonically disperse at an ultrasonic frequency of 80 kHz until a uniform liquid material is formed, protect with argon gas, add 4 g of azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 70 °C, keep warm and stir for 2 h to obtain an acrylic acid polymerization emulsion;

[0056] Step 2: Add 10 g of talcum powder, 1.5 g of propylene glycol, 2 g of polyethyl acrylate and 2.5 g of dimethyl silicone oil to the acrylic acid polymerization emulsion, stir and mix at a rate of 500 r / min for 40 min, let stand to defoam, and discharge to obtain a paper coating liquid;

[0057] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper and cure at room temperature for 3 h to obtain a paper coating.

[0058] Comparative Example 2

[0059] Preparation of Paper Coating

[0060] Step 1: Add 35 g of acrylic acid, 20 g of isooctyl acrylate, 15 g of glycidyl methacrylate, 10 g of 2-hydroxyethyl methacrylate, 7 g of polymeric intermediate and 50 g of deionized water into a reaction kettle, ultrasonically disperse at an ultrasonic frequency of 80 kHz until a uniform liquid material is formed, protect with argon gas, add 4 g of azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 70 °C, keep warm and stir for 2 h to obtain an acrylic polymer emulsion;

[0061] Step 2: Add 10 g of talcum powder, 1.5 g of propylene glycol, 2 g of polyethyl acrylate and 2.5 g of dimethyl silicone oil into the acrylic polymer emulsion, stir and mix at a rate of 500 r / min for 40 min, stand still to defoam, and discharge to obtain a paper coating liquid;

[0062] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper, cure at room temperature for 3 h to obtain a paper coating.

[0063] The preparation method of the polymeric intermediate is the same as that in Example 1.

[0064] Comparative Example 3

[0065] Preparation of Paper Coating

[0066] Step 1: Add 35 g of acrylic acid, 20 g of isooctyl acrylate, 15 g of glycidyl methacrylate, 10 g of 2-hydroxyethyl methacrylate and 50 g of deionized water into a reaction kettle, ultrasonically disperse at an ultrasonic frequency of 80 kHz until a uniform liquid material is formed, protect with argon gas, add 4 g of azobisisobutyronitrile to the liquid material, after adding, turn on the heating, control the temperature at 70 °C, keep warm and stir for 2 h to obtain an acrylic polymer emulsion;

[0067] Step 2: Add 10 g of talcum powder, 1.5 g of propylene glycol, 2 g of polyethyl acrylate and 2.5 g of dimethyl silicone oil into the acrylic polymer emulsion, stir and mix at a rate of 500 r / min for 40 min, stand still to defoam, and discharge to obtain a paper coating liquid;

[0068] Step 3: Uniformly coat the paper coating liquid on the surface of the base paper, cure at room temperature for 3 h to obtain a paper coating.

[0069] Performance Testing

[0070] Test the antibacterial performance and antibacterial durability of the paper coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention according to GB / T 21866-2008 "Determination Method and Antibacterial Effect of Antibacterial Coatings (Paint Films)", and select Staphylococcus aureus as the test strain. The specific test results are shown in Table 1:

[0071] Table 1 - Performance Testing

[0072]

[0073] As can be seen from the test results in Table 1, the paper coatings prepared in Examples 1 to 3 have excellent antibacterial properties and show good antibacterial persistence; in the paper coating prepared in Comparative Example 1, unmodified zinc oxide is used to replace the antibacterial modification component. Compared with the examples, the antibacterial property of the paper coating is average. It is speculated that this may be because the added zinc oxide cannot be evenly dispersed in the matrix, resulting in a decrease in the antibacterial property of the paper coating and poor antibacterial persistence; in the paper coating prepared in Comparative Example 2, a polymeric intermediate is used to replace the antibacterial modification component. Compared with the examples, after being irradiated with ultraviolet light for 2 h, the antibacterial property of the paper coating is average. It is speculated that this may be because it cannot synergistically produce an organic-inorganic multiple synergistic antibacterial effect with zinc oxide, resulting in a decrease in the antibacterial property of the paper coating and it cannot crosslink with the matrix, so the antibacterial persistence is also poor; no antibacterial modification component is added to the paper coating prepared in Comparative Example 3, so the antibacterial property and antibacterial durability of the paper coating are the worst.

[0074] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the concept of the invention or exceed the scope defined by this claim book, they should all fall within the protection scope of the present invention.

Claims

1. An antibacterial and repulpable functional paper coating, characterized in that, The paper coating is formed by coating a paper coating liquid on the surface of the base paper; the paper coating liquid comprises raw materials in the following parts by weight: 30-40 parts of acrylic acid, 15-25 parts of isooctyl acrylate, 10-20 parts of glycidyl methacrylate, 5-15 parts of 2-hydroxyethyl methacrylate, 5-8 parts of an antibacterial modification component, 40-60 parts of deionized water, 3-5 parts of azobisisobutyronitrile, 8-12 parts of a filler, 1-2 parts of a film-forming aid, 1-3 parts of a leveling agent, and 2-3 parts of an antifoaming agent; The preparation method of the antibacterial modification component comprises the following steps: S1: Mix 1,3-diaminoguanidine hydrochloride with dimethyl sulfoxide, pour it into a reaction kettle, start stirring, and after forming a uniform solution, under continuous nitrogen conditions, add 4-hydroxyisophthalaldehyde. After adding, raise the temperature to 50-55 °C, stir at this temperature for 4-9 h, and rotary evaporate to remove the solvent to obtain a polymeric intermediate; S2: Under nitrogen protection, mix zinc oxide and N-methylpyrrolidone, and after ultrasonic treatment to form a dispersion liquid, add 2-chloroacrylic acid and catalyst A to the dispersion liquid. Under stirring conditions, raise the temperature of the system to 90-110 °C, keep warm for 5-7 h, then separate the solid material, and after washing and drying, obtain modified zinc oxide; the catalyst A is any one of tetrabutyl titanate, tetraethyl titanate or tetraisopropyl titanate; S3: Ultrasonically disperse the modified zinc oxide in N,N-dimethylformamide to form a uniform dispersion liquid, pass nitrogen to remove oxygen, add the polymeric intermediate and sodium carbonate solution to the dispersion liquid, start heating, and after the temperature of the system reaches 70-80 °C, keep stirring at a constant temperature for 8-12 h, then filter, collect the product, wash the product, and dry to obtain the antibacterial modification component.

2. The antibacterial and repulpable functional paper coating according to claim 1, characterized in that, In step S2, the average particle size of the zinc oxide is 5 μm.

3. An antibacterial and repulpable functional paper coating according to claim 1, characterized in that, In step S2, the mass ratio of the zinc oxide to the 2-chloroacrylic acid is 1:0.1-0.

3.

4. An antibacterial and repulpable functional paper coating according to claim 1, characterized in that, In step S3, the mass fraction of the sodium carbonate solution is 5%-40%.

5. A method for preparing an antibacterial and repulpable functional paper coating as described in claim 1, characterized in that, Comprises the following steps: Step 1: Add acrylic acid, isooctyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, the antibacterial modification component and deionized water into a reaction kettle, ultrasonically disperse to form a uniform liquid material, protect with an inert gas, add azobisisobutyronitrile to the liquid material. After adding, start heating, control the temperature to 60-80 °C, keep warm and stir for 1-3 h to obtain an acrylic polymer emulsion; Step 2: Add the filler, the film-forming aid, the leveling agent and the antifoaming agent to the acrylic polymer emulsion, stir and mix at a rate of 400-600 r / min for 30-50 min, stand for defoaming, and discharge to obtain the paper coating liquid; Step 3: Uniformly coat the paper coating liquid on the surface of the base paper, and cure at room temperature for 2-4 h to obtain the paper coating.

6. The preparation method of the antibacterial and repulpable functional paper coating according to claim 5, characterized in that, In step 1, in the ultrasonic dispersion, the ultrasonic frequency is 70-90 kHz.

7. The preparation method of the antibacterial and repulpable functional paper coating according to claim 5, characterized in that, In step 1, the inert gas is any one of argon, neon or helium.

8. The preparation method of the antibacterial and repulpable functional paper coating according to claim 5, characterized in that, In Step 2, the filler is any one of talcum powder, calcium carbonate, or titanium dioxide; the film-forming aid is any one of propylene glycol, propylene glycol methyl ether, or dipropylene glycol methyl ether; the leveling agent is any one of butyl acrylate or ethyl acrylate; the defoamer is any one of dimethyl silicone oil or fatty alcohol polyoxyethylene ether.

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