High-binding-force easily-degradable antibacterial fresh-keeping emulsion coating and preparation method thereof

Abstract

The invention provides a high-binding-force easily-degradable bacteriostatic fresh-keeping emulsion coating and a preparation method thereof, and belongs to the technical field of coatings, the high-binding-force easily-degradable bacteriostatic fresh-keeping emulsion coating comprises the following technical indexes: the solid content is 35.1 + / -1.0%; the viscosity is less than 200mPas; the pH (Potential of Hydrogen) is 8.5 to 10.5; the density is 1.00 to 1.10 g / ml; the high-binding-force easily-degradable bacteriostatic fresh-keeping emulsion coating is prepared from an easily-degradable polymer, a bacteriostatic agent, a thickening agent, a pH regulator and water, wherein the mass of the easily-degradable polymer accounts for 20%-30% of the total mass of the coating, the mass of the bacteriostatic agent accounts for 0.5%-2% of the total mass of the coating, the mass of the thickening agent accounts for 0.2%-1% of the total mass of the coating, the mass of the pH regulator accounts for 0.1%-0.5% of the total mass of the coating, and the balance is water. Through the technical combination of the easily degradable polymer, the composite bacteriostatic agent and the environment-friendly process, a novel coating system is constructed, the core pain point of a traditional food packaging coating is solved, the packaging material is promoted to be upgraded to the environment-friendly, high-efficiency and safe direction, and remarkable economic value and social benefit are achieved.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, and particularly to a high-binding-force, easily degradable, antibacterial and fresh-keeping emulsion coating. Background Art

[0002] Food packaging coatings refer to functional films or coatings applied to the surface of food packaging materials to improve the properties of packaging materials (such as barrier properties, water resistance, oil resistance, antibacterial properties, antioxidant properties, etc.), so as to extend the shelf life of food, ensure food safety and improve packaging applicability.

[0003] Traditional food packaging coatings generally have the following defects:

[0004] Single function: Most coatings only have a single fresh-keeping or adhesion function, and it is difficult to simultaneously meet the multiple requirements of high adhesion, easy degradability and antibacterial fresh-keeping.

[0005] Environmentally unfriendly: A large amount of non-degradable petroleum-based polymers (such as acrylic resin, polyethylene) are used, and "white pollution" is formed after being discarded, which does not conform to the environmental protection policy orientation.

[0006] Safety hazards: Some antibacterial agents use chemical synthetic components, there is a risk of migration, and it is difficult to meet the safety requirements of food contact materials.

[0007] Process limitations: Conventional emulsion polymerization processes are prone to polymer degradation or antibacterial agent inactivation, and the coating uniformity and stability are insufficient, affecting the product performance consistency.

[0008] Therefore, a high-binding-force, easily degradable, antibacterial and fresh-keeping emulsion coating and its preparation method are proposed. Summary of the Invention

[0009] The purpose of the present invention is to solve the problems raised in the background art, and provide a high-binding-force, easily degradable, antibacterial and fresh-keeping emulsion coating and its preparation method.

[0010] The specific technical solutions are as follows:

[0011] A high-binding-force, easily degradable, antibacterial and fresh-keeping emulsion coating includes the following technical indicators: the solid content is 35.1 ± 1.0%; the viscosity < 200 mPas; the pH is 8.5 - 10.5; the density is 1.00 - 1.10 g / ml; the high-binding-force, easily degradable, antibacterial and fresh-keeping emulsion coating is composed of an easily degradable polymer, an antibacterial agent, a thickener, a pH regulator and water, wherein the easily degradable polymer accounts for 20% - 30% of the total mass of the coating, the antibacterial agent accounts for 0.5% - 2%, the thickener accounts for 0.2% - 1%, the pH regulator accounts for 0.1% - 0.5%, and the balance is water.

[0012] The above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein the easily degradable polymer is one or a combination of poly(lactic acid), poly(butylene adipate-co-terephthalate) or starch-based polymer, and the compounding ratio is 1:(0.5 - 2).

[0013] The above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein the antibacterial agent is one or more of chitosan, tea polyphenols, lysozyme or silver ion antibacterial agent, and the particle size of the silver ion antibacterial agent is ≤50nm.

[0014] The above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein the thickening agent is one of sodium carboxymethyl cellulose, xanthan gum or sodium alginate, and the addition amount is 0.3% - 0.8%.

[0015] The above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein the pH regulator is sodium bicarbonate or triethanolamine, which is used to adjust the system pH to 9.0 - 10.0.

[0016] The above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein the adhesion of the coating to polyethylene and polypropylene plastic substrates is ≥4B, and the degradation rate within 6 months in the soil is ≥60%.

[0017] The present invention also provides a preparation method of a high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, comprising the following steps:

[0018] (1) Dissolve the easily degradable polymer in an organic solvent, and stir at 30 - 50°C until completely dissolved to form a polymer solution with a concentration of 25% - 35%.

[0019] (2) Add the antibacterial agent and the thickening agent to the solution in step (1), and perform ultrasonic dispersion at 50 - 70°C for 10 - 20 min, and the ultrasonic frequency is 20 - 40 kHz.

[0020] (3) Slowly add deionized water while stirring, and the stirring speed is 200 - 400 r / min to form an oil-in-water emulsion.

[0021] (4) Add the pH regulator to adjust the system pH to the target range, and remove the organic solvent by reduced pressure distillation to obtain the coating.

[0022] The above-mentioned preparation method of a high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein in step (1), the organic solvent is one of acetone, ethyl acetate or dimethyl sulfoxide, and the mass ratio of the solvent to the easily degradable polymer is (3 - 5):1.

[0023] The preparation method of the above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein, in step (3), the temperature of the deionized water is 40-60°C, and the volume ratio of water to the organic solvent is (2-3):1.

[0024] The preparation method of the above-mentioned high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating, wherein, in step (4), the pressure of vacuum distillation is -0.08 to -0.05 MPa, the temperature is 40-55°C, and the distillation time is 1-2 hours.

[0025] The present invention has the following beneficial effects:

[0026] (1) Functional integration

[0027] Multi-effect synergy: Integrate high binding force, easy degradability and antibacterial and fresh-keeping functions into a single coating system, solve the problem of "functional fragmentation" of traditional coatings, and meet the requirements of the whole life cycle of food packaging (firm adhesion, antibacterial and fresh-keeping, environmental protection and degradation).

[0028] Scene expansion: Its high adhesion characteristics enable it to be applied to scenarios such as complex-shaped packaging films and bottle and can coatings, broadening the application scope of traditional coatings.

[0029] (2) Environmental friendliness

[0030] Material innovation: Use easily degradable polymers such as polylactic acid (PLA) and polybutylene adipate / terephthalate (PBAT) to replace traditional petroleum-based materials. After the coating is discarded, it can be gradually decomposed in the natural environment, reducing plastic waste pollution, and meeting the "dual carbon" goal and the development trend of green packaging technology.

[0031] Environmentally friendly process: Select low-toxic organic solvents (such as acetone and ethyl acetate) and efficiently remove residues through vacuum distillation process, reduce the emission of volatile organic compounds (VOCs) during the production process, and improve the environmental compatibility of the process.

[0032] (3) Improvement of safety

[0033] Optimization of the antibacterial system: Compound natural antibacterial components (chitosan, tea polyphenols) with nano silver ions. While ensuring high-efficiency antibacterial (covering various microorganisms such as bacteria and fungi), avoid the potential toxicity of chemically synthesized antibacterial agents, and meet the safety standards of food contact materials.

[0034] Gentle condition control: The preparation process adopts mild conditions such as medium-low temperature stirring and weak alkaline pH adjustment, avoiding the destruction of the component structure by high temperature, strong acid / strong base, and ensuring the chemical stability and safety of the coating.

[0035] (4) Performance stability

[0036] System compatibility: By adjusting the viscosity of the emulsion with a thickener and promoting the uniform distribution of components through ultrasonic dispersion, a stable oil-in-water emulsion system is formed to prevent the sedimentation of bacteriostatic agent particles and avoid demulsification and delamination, ensuring the uniformity of product performance during the storage period.

[0037] Process controllability: The preparation process of dissolving, dispersing, and emulsifying in stages can precisely control parameters such as the solvent ratio, ultrasonic frequency, and distillation pressure to achieve the balance between the degradation performance and mechanical properties of the polymer, ensuring the sustainability of the coating function (such as long-term adhesion without falling off and stable bacteriostatic activity). Brief Description of the Drawings

[0038] Figure 1 It is a flowchart of the preparation method of the high-binding-force and easily degradable bacteriostatic and fresh-keeping emulsion coating provided by the embodiment of the present invention. Detailed Embodiments

[0039] The technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0040] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; for better illustration of the embodiments of the present invention, some components in the drawings will be omitted, enlarged, or reduced, which do not represent the actual sizes of the products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0041] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] In the description of the present invention, unless otherwise clearly defined and limited, if terms such as "connection" are used to indicate the connection relationship between components, this term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example 1

[0044] The highly adhesive, easily degradable antibacterial and fresh-keeping emulsion coating provided in this embodiment includes the following technical indicators: the solid content is 35.1 ± 1.0%; the viscosity < 200 mPas; the pH is 8.5 - 10.5; the density is 1.00 - 1.10 g / ml; the highly adhesive, easily degradable antibacterial and fresh-keeping emulsion coating is composed of an easily degradable polymer, an antibacterial agent, a thickener, a pH regulator and water, wherein the easily degradable polymer accounts for 20% - 30% of the total mass of the coating, the antibacterial agent accounts for 0.5% - 2%, the thickener accounts for 0.2% - 1%, the pH regulator accounts for 0.1% - 0.5%, and the balance is water.

[0045] By defining specific components and ratios such as easily degradable polymers and antibacterial agents, the coating has both substrate adhesion ability, natural degradation performance and antibacterial and fresh-keeping functions, solving the defect of single function of traditional coatings; the components act synergistically to form a stable emulsion system, which is convenient for industrial production and coating application.

[0046] Among them, the easily degradable polymer is one or more of polylactic acid (PLA), polybutylene adipate / terephthalate (PBAT) or starch-based polymer, and the compounding ratio is 1:(0.5 - 2). Compounding easily degradable polymers such as polylactic acid (PLA) and PBAT can adjust the molecular chain structure, improve the decomposition rate and thoroughness of the coating in the natural environment, and reduce environmental residues; the compounding ratio regulation enables the coating to have both flexibility and adhesion, meeting the fitting requirements of different packaging substrates (such as plastics and papers).

[0047] Among them, the antibacterial agent is one or more of chitosan, tea polyphenols, lysozyme or silver ion antibacterial agent, and the particle size of the silver ion antibacterial agent ≤ 50 nm. Compounding natural antibacterial agents such as chitosan and tea polyphenols with nano silver ions can cover various microorganisms such as bacteria and fungi, and can extend the food preservation period; due to the small particle size and high activity of nano silver ions, the antibacterial efficiency can be enhanced; the combination of natural antibacterial components and nano materials can reduce the potential risk of chemically synthesized antibacterial agents while ensuring the antibacterial effect, and is suitable for food contact scenarios.

[0048] Among them, the thickener is one of sodium carboxymethyl cellulose (CMC-Na), xanthan gum or sodium alginate, and the addition amount is 0.3% - 0.8%. Using thickeners such as sodium carboxymethyl cellulose and xanthan gum to adjust the viscosity of the emulsion enables the coating to form a uniform film during the coating process and is not easy to run off, improving product consistency; the thickener forms a network structure, which can prevent the sedimentation of antibacterial agent particles and extend the storage period of the emulsion.

[0049] Among them, the pH regulator is sodium bicarbonate or triethanolamine, which is used to adjust the system pH to 9.0 - 10.0. Using sodium bicarbonate or triethanolamine to adjust the weak alkaline environment of the system can enhance the stability of the degradable polymer, while inhibiting the reproduction of microorganisms in an acidic environment, synergistically improving the antibacterial effect; avoiding the use of strong acid / strong base regulators to reduce the pollution risk during the production process.

[0050] Among them, the adhesion of the coating to plastic substrates such as polyethylene (PE) and polypropylene (PP) is ≥ 4B (cross-cut method GB / T9286 - 1998), and the degradation rate is ≥ 60% within 6 months in the soil. Testing the strong adhesion to common plastic substrates such as PE and PP can ensure that the coating is not easy to fall off and peel during the food packaging, transportation and storage processes, maintaining the continuity of the antibacterial and fresh-keeping functions; the degradation performance in the soil enables the coating to decompose naturally after being discarded, reducing plastic waste pollution, which conforms to the development trend of green packaging technology.

[0051] Example 2

[0052] This example provides a preparation method of a high-binding-force degradable antibacterial and fresh-keeping emulsion coating, as Figure 1 shown, including the following steps:

[0053] (1) Dissolve the degradable polymer in an organic solvent, and stir at 30 - 50 °C until completely dissolved to form a polymer solution with a concentration of 25% - 35%.

[0054] (2) Add an antibacterial agent and a thickener to the solution in step (1), and ultrasonically disperse at 50 - 70 °C for 10 - 20 min, with an ultrasonic frequency of 20 - 40 kHz.

[0055] (3) Slowly add deionized water while stirring, with a stirring speed of 200 - 400 r / min, to form an oil-in-water emulsion.

[0056] (4) Add a pH regulator to adjust the system pH to the target range, and remove the organic solvent by vacuum distillation to obtain the coating.

[0057] Through the preparation process of staged dissolution, dispersion and emulsification, the operating conditions are mild (medium and low temperature stirring, ultrasonic treatment), which is suitable for large-scale production, reducing equipment energy consumption and process complexity; ultrasonic dispersion is used to promote the uniform distribution of the antibacterial agent and avoid agglomeration and inactivation; vacuum distillation is used to remove the organic solvent, retaining the integrity of the polymer molecular chain and ensuring the balance of degradation performance and mechanical properties.

[0058] Among them, in step (1), the organic solvent is one of acetone, ethyl acetate or dimethyl sulfoxide (DMSO), and the mass ratio of the solvent to the biodegradable polymer is (3 - 5):1. Organic solvents such as acetone and ethyl acetate have high solubility in the biodegradable polymer, shortening the dissolution time and improving production efficiency; controlling the mass ratio of the solvent to the polymer ensures the fluidity of the system, facilitating subsequent mixing processes; choosing low-toxic organic solvents reduces the emission of volatile organic compounds (VOCs) during production.

[0059] Among them, in step (3), the temperature of the deionized water is 40 - 60°C, and the volume ratio of water to the organic solvent is (2 - 3):1. By controlling the temperature and volume ratio of the deionized water, it is possible to promote the formation of a stable dispersion system of the oil-in-water emulsion, avoid demulsification or stratification, and ensure the uniformity of product quality; the warm water condition and the stirring speed act synergistically to make the organic solvent and the aqueous phase fully contact, laying a foundation for subsequent impurity removal by vacuum distillation.

[0060] Among them, in step (4), the pressure of the vacuum distillation is -0.08 to -0.05 MPa, the temperature is 40 - 55°C, and the distillation time is 1 - 2 hours. The vacuum distillation process efficiently removes the organic solvent at a low temperature, reducing the risk of chemical residues in the product and meeting the safety standards for food contact materials; precisely controlling the distillation pressure and time avoids polymer degradation or bacteriostatic agent failure caused by high temperature, ensuring the integrity of the coating function.

[0061] This example also provides the following experimental data:

[0062] 1. Coating basic performance data table:

[0063]

[0064] 2. Adhesion and degradation performance data table

[0065]

[0066] 3. Bacteriostatic performance data table

[0067]

[0068] 4. Process parameter comparison data table

[0069]

[0070] Data description

[0071] 1. Basis for selecting the comparative example:

[0072] The comparative example uses a commercially available acrylate coating for food packaging, which is characterized by non-degradability, a single bacteriostatic function, and medium adhesion, representing the traditional technical level.

[0073] 2. Key performance advantages:

[0074] High binding force: By polymer blending (PLA + PBAT) to form an interpenetrating network structure, the chemical bonding ability is enhanced, solving the pain point of "weak adhesion" of traditional degradable materials.

[0075] Efficient degradation: The soil degradation rate exceeds 60% in 6 months, mainly due to the ester bond structure of PLA / PBAT being easily decomposed by microorganisms.

[0076] Synergistic antibacterial: Natural antibacterial agents (chitosan) damage the bacterial cell membrane, and silver nanoparticles (≤50nm) block the microbial metabolic pathway, forming a dual antibacterial mechanism.

[0077] In summary, through component innovation, process optimization and performance synergy, the present invention breaks through the technical bottleneck of traditional fresh-keeping emulsion coatings and realizes the following core advantages:

[0078] (I) Functional integration

[0079] Multi-effect synergy: Integrate high binding force, easy degradability and antibacterial fresh-keeping functions into a single coating system, solve the problem of "functional fragmentation" of traditional coatings, and meet the full life cycle requirements of food packaging (firm adhesion, antibacterial fresh-keeping, environmental protection and degradation).

[0080] Scene expansion: Its high adhesion characteristics enable it to be applied to scenarios such as complex-shaped packaging films and bottle coatings, broadening the application scope of traditional coatings.

[0081] (II) Environmental friendliness

[0082] Material innovation: Use easily degradable polymers such as polylactic acid (PLA) and polybutylene adipate terephthalate (PBAT) to replace traditional petroleum-based materials. After the coating is discarded, it can be gradually decomposed in the natural environment, reducing plastic waste pollution, and meeting the "dual carbon" goal and the development trend of green packaging technology.

[0083] Process environmental protection: Select low-toxic organic solvents (such as acetone and ethyl acetate) and efficiently remove residues through vacuum distillation process, reducing the emission of volatile organic compounds (VOCs) during production and improving the environmental compatibility of the process.

[0084] (III) Safety improvement

[0085] Optimization of antibacterial system: Compound natural antibacterial components (chitosan, tea polyphenols) with silver nanoparticles. While ensuring high-efficiency antibacterial (covering various microorganisms such as bacteria and fungi), avoid the potential toxicity of chemically synthesized antibacterial agents, meeting the safety standards of food contact materials.

[0086] Gentle condition control: The preparation process adopts gentle conditions such as medium and low temperature stirring and weak alkaline pH adjustment to avoid the destruction of the component structure by high temperature, strong acid / strong base, and ensure the chemical stability and safety of the coating.

[0087] (IV) Performance stability

[0088] System compatibility: The viscosity of the emulsion is adjusted by a thickener, and ultrasonic dispersion is used to promote the uniform distribution of components to form a stable oil-in-water emulsion system, preventing the sedimentation of bacteriostatic agent particles and avoiding demulsification and delamination, ensuring the uniformity of product performance during the storage period.

[0089] Process controllability: The preparation process of dissolving, dispersing, and emulsifying in stages accurately controls parameters such as the solvent ratio, ultrasonic frequency, and distillation pressure to achieve the balance of the polymer degradation performance and mechanical properties, and ensure the continuity of the coating function (such as long-term adhesion without falling off and stable bacteriostatic activity).

[0090] III. Summary of technical effects

[0091] Through the technical combination of "easily degradable polymer + composite bacteriostatic agent + environmentally friendly process", the present invention constructs a new type of coating system, which not only solves the core pain points of traditional food packaging coatings, but also promotes the upgrading of packaging materials towards the direction of "environmental protection, high efficiency, and safety", and has significant economic value and social benefits.

[0092] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-binding-force, easily degradable antibacterial and fresh-keeping emulsion coating, characterized in that, It includes the following technical indicators: the solid content is 35.1±1.0%; the viscosity is <200 mPas; the pH is 8.5 - 10.5; the density is 1.00 - 1.10 g / ml; the high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating is composed of an easily degradable polymer, an antibacterial agent, a thickener, a pH regulator and water, wherein the easily degradable polymer accounts for 20% - 30% of the total mass of the coating, the antibacterial agent accounts for 0.5% - 2%, the thickener accounts for 0.2% - 1%, the pH regulator accounts for 0.1% - 0.5%, and the balance is water.

2. The high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein The easily degradable polymer is one or more of polylactic acid, polybutylene adipate terephthalate or starch-based polymer, and the compounding ratio is 1:(0.5 - 2).

3. The high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein The antibacterial agent is one or more of chitosan, tea polyphenols, lysozyme or silver ion antibacterial agent, wherein the particle size of the silver ion antibacterial agent is ≤50 nm.

4. The high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein, The thickener is one of sodium carboxymethyl cellulose, xanthan gum or sodium alginate, and the addition amount is 0.3% - 0.8%.

5. The highly cohesive and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein The pH regulator is sodium bicarbonate or triethanolamine, which is used to adjust the pH of the system to 9.0 - 10.

0.

6. The high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein The adhesion of the coating to polyethylene and polypropylene plastic substrates is ≥4B, and the degradation rate is ≥60% within 6 months in the soil.

7. A preparation method of a high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating as described in any one of claims 1-6, characterized in that, It includes the following steps: (1) Dissolve the easily degradable polymer in an organic solvent, stir at 30 - 50 °C until completely dissolved to form a polymer solution with a concentration of 25% - 35%. (2) Add the antibacterial agent and the thickener to the solution in step (1), ultrasonically disperse at 50 - 70 °C for 10 - 20 min, and the ultrasonic frequency is 20 - 40 kHz. (3) Slowly add deionized water while stirring, and the stirring speed is 200 - 400 r / min to form an oil-in-water emulsion. (4) Add the pH regulator to adjust the pH of the system to the target range, and remove the organic solvent by vacuum distillation to obtain the coating.

8. The preparation method of the high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 7, wherein, The organic solvent in step (1) is one of acetone, ethyl acetate or dimethyl sulfoxide, and the mass ratio of the solvent to the easily degradable polymer is (3 - 5):

1.

9. The preparation method of the high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein The temperature of the deionized water in step (3) is 40 - 60 °C, and the volume ratio of water to the organic solvent is (2 - 3):

1.

10. The preparation method of the high-binding-force and easily degradable antibacterial and fresh-keeping emulsion coating according to claim 1, wherein, In step (4), the pressure of vacuum distillation is -0.08 to -0.05 MPa, the temperature is 40 - 55 °C, and the distillation time is 1 - 2 hours.

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