Industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection functions and preparation method thereof

Abstract

The invention discloses an industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection functions and a preparation method thereof, and relates to the technical field of industrial packaging coatings. The coating is prepared from modified polyurethane acrylate, ethyoxyl ethyoxyl ethyl acrylate, 1, 6-hexanediol diacrylate, hydroxyethyl methylacrylate, trimethylolpropane triacrylate, epsilon-polylysine, carbon quantum dot-microencapsulated spiropyrane, a water-based flatting agent, 2, 4, 6-trimethyl-1, 3-pentanediol diacrylate, a water-based curing agent, a defoaming agent, a defoaming agent and a solvent. The cleaning agent is prepared from 2, 4, 6-trimethylbenzoyl diphenyl phosphine oxide, a dispersing agent, lauryl sodium sulfate, pathogen microcapsules and ethyl acetate. The three functions of anti-counterfeiting, antibiosis and pathogen detection are integrated into a single coating, the limitation that a traditional packaging material is single in function is broken through, the anti-counterfeiting reliability is improved, no harmful substance is migrated out, and efficient pathogen screening is achieved; safety standards are met, harmful substance migration is avoided, and the base material is matched with various base materials such as films and fibers and is mechanically strengthened.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial packaging coatings, and in particular relates to an industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection, and a preparation method thereof. Background Art

[0002] With the rapid development of modern industry, industrial packaging in the fields of food, medicine, daily chemicals, etc. has put forward higher requirements for functionality and safety. Traditional packaging materials generally have problems such as single function, susceptibility to contamination, and lack of traceability. For example, although ordinary plastic packaging has certain moisture-proof and oxidation-proof capabilities, it cannot effectively prevent the invasion of microorganisms, resulting in easy deterioration of products during storage. In recent years, the problem of counterfeiting and inferior products has become increasingly serious. Traditional packaging can hardly provide effective anti-counterfeiting measures. At the same time, consumers' concern for safety has led to higher market requirements for the antibacterial properties of packaging materials. Ordinary materials are prone to breeding bacteria during long-term storage, and rapid detection of pathogens cannot be achieved, exacerbating safety risks. It is worth noting that although some multifunctional coatings on the current market are technologically advanced, they often have limited application scopes and are only applicable to specific materials or specific environmental conditions, making it difficult to meet diverse packaging needs.

[0003] Increasingly stringent global environmental regulations are placing higher demands on the biodegradability and biosafety of packaging materials. Traditional plastics are difficult to degrade and may contain harmful substances, making environmentally friendly and safe multifunctional packaging coatings a research hotspot. However, in actual applications, many functional coatings face the technical bottleneck of poor adhesion to the substrate. They are prone to delamination and shedding in complex environments or under mechanical stress, seriously affecting the protective effect. At the same time, some coating materials, while imparting new functions, may affect key indicators such as the original mechanical strength, flexibility, or barrier properties of the substrate, resulting in a decline in the overall performance of the packaging. Although the functional packaging materials currently available on the market can achieve a single function, they are difficult to meet the needs of multi-functional integration: existing anti-counterfeiting technologies are easily imitated, the performance of antimicrobial coatings will decline over time, and pathogen detection technologies often require complex equipment or a long time. Therefore, the development of environmentally friendly, safe, and intelligent packaging coatings that integrate anti-counterfeiting, antimicrobial, and intelligent detection functions has become the key to improving packaging performance, but the compatibility and synergy between the coating and the substrate must be addressed. Summary of the Invention

[0004] The present invention provides an industrial packaging coating that integrates anti-counterfeiting, antibacterial and pathogen detection, and a preparation method thereof. Through material innovation and process optimization, a multifunctional industrial packaging coating that integrates anti-counterfeiting, antibacterial and pathogen detection is developed, with particular emphasis on solving three major pain points in the existing technology: (1) the application scope of the coating is expanded through molecular structure design, and it can be adapted to a variety of substrates such as plastics, paper, and metal, breaking through the single application scope and poor adhesion of traditional coatings; (2) the coating is multifunctional, organically integrating functional modules such as anti-counterfeiting, antibacterial, and pathogen detection, building a synergistic network at the microscopic level, and ensuring safety in use; (3) the original performance of the substrate is maintained through formulation optimization, maintaining key indicators such as the mechanical strength and barrier properties of the substrate. This technology not only significantly improves the safety and reliability of packaging, but also expands the application scenarios of environmentally friendly intelligent packaging materials in the industrial field, meets the needs of modern industry for intelligent and information-based management, and truly achieves a perfect unity of functionality and practicality; in summary, the problems in the background technology are solved.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The industrial packaging coating of the present invention has the functions of anti-counterfeiting, antibacterial and pathogen detection, and comprises 55-65wt% of modified polyurethane acrylate, 10-20wt% of ethoxyethoxyethyl acrylate, 5-10wt% of 1,6-hexanediol diacrylate, 5-8wt% of hydroxyethyl methacrylate, 3-8wt% of trimethylolpropane triacrylate, 0.5-1.0wt% of ε-polylysine, 0.1-0.5wt% of carbon quantum dot-microencapsulated spiropyran, 0.1-0.5wt% of BYK-333, 1-5wt% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 0.1-0.5wt% of BYK-190, 0.1-0.5wt% of sodium lauryl sulfate, 2-5% of pathogen microcapsules and 5-8wt% of ethyl acetate.

[0007] The method for preparing the industrial packaging coating with integrated anti-counterfeiting, antibacterial and pathogen detection functions comprises the following steps:

[0008] (1) preparing a coating comprising the above ingredients;

[0009] (2) applying the coating to the surface of the industrial packaging substrate by a slot coating method;

[0010] (3) The coating is obtained after being initiated by ultraviolet light.

[0011] Among them, the coating forms a dense and uniform single-layer composite structure through the synergistic effect of various components. It not only has anti-counterfeiting, antibacterial and pathogen detection functions, but also has the characteristics of strong adhesion, excellent mechanical properties, safety and environmental protection.

[0012] This step (1) is subdivided into:

[0013] 1-a Preparation of multifunctional coating precursor

[0014] Add 55-65wt% of modified polyurethane acrylate, 10-20wt% of ethoxyethoxyethyl acrylate, 5-10wt% of 1,6-hexanediol diacrylate, 5-8wt% of hydroxyethyl methacrylate, 3-8wt% of trimethylolpropane triacrylate, 0.1-0.5wt% of BYK-333, 1-5wt% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and 5-8wt% of ethyl acetate into a reaction container in proportion and stir evenly.

[0015] 1-b. Preparation of anti-counterfeiting functional component (carbon quantum dots-microencapsulated spiropyran)

[0016] Activation of carbon quantum dots: disperse carbon quantum dots in deionized water, add EDC and NHS, and react at room temperature with low stirring speed (300 rpm) for 1 hour.

[0017] Surface modification of spiropyran microcapsules: spiropyran microcapsules were dispersed in ethanol, and aminosilane coupling agent KH-550 was added, and the mixture was stirred at 50° C. for 2 hours (400 rpm).

[0018] Amide bond grafting reaction: The activated carbon quantum dots and the modified spiropyran microcapsules were mixed at a ratio of 1:1.5 (w / w), deionized water was added, the pH was adjusted to 5-6, and the mixture was stirred at low speed (300 rpm) at room temperature for 4 hours to form a stable grafted complex.

[0019] Chitosan Coating: Dissolve chitosan in 1% (v / v) acetic acid to prepare a 1.5% (w / v) solution. Slowly add chitosan dropwise to the grafted composite dispersion (at a rate of 1 mL / min). Stir and mix for 2-3 hours (400 rpm). Adjust the pH to 5-6. Spray dry the mixture (inlet air temperature 130°C, outlet air temperature 75°C) to form a coating layer ≤50 nm thick that is light-transmitting and breathable without affecting its functionality.

[0020] 1-c. Preparation of pathogen detection functional components (microcapsules)

[0021] Preparation of antibody-TMB mixture: Take HRP-labeled antibody, dilute it to 2 mg / mL with PBS buffer (pH 7.4), add TMB substrate at a ratio of antibody: substrate = 1:2 (v / v), and mix gently.

[0022] Microcapsule embedding: Slowly drop the antibody-TMB mixture into molten paraffin / beeswax and emulsify it with a homogenizer at 12000 rpm for 10 minutes to form microcapsules with a particle size of 10-15 μm.

[0023] Cooling and solidification: Cool the microcapsule emulsion in an ice bath until it is completely solidified, centrifuge at 4°C and 4000 rpm for 8 minutes, discard the supernatant, wash three times with PBS buffer, and store at 4°C for later use.

[0024] 1-d. Mix the functional components before coating

[0025] Addition of anti-counterfeiting functional components: Mix the wrapped anti-counterfeiting functional components with a small amount of ethanol, ultrasonicate for 30 seconds, add 0.2 wt% of the coating, then add 0.2 wt% of BYK-190 and 0.3 wt% of SDS, and stir at 400 rpm for 10 minutes.

[0026] Antimicrobial agent addition: 0.8 wt% of ε-polylysine was added to the coating and stirred at 400 rpm for 8 minutes.

[0027] Adding pathogen microcapsules: Mix pathogen antibody microcapsules with a small amount of ethanol, sonicate for 30 seconds, add 3 wt% to the coating, and stir at 400 rpm for 8 minutes to obtain a multifunctional composite coating.

[0028] The coating process used is the slot coating method, and its parameters are set as follows: slot die gap setting value: 8-12 μm; coating speed: 8-15 m / min; coating temperature: 20-30°C, substrate temperature: 25-35°C, coating thickness: 5-8 μm.

[0029] UV curing method is used, and its parameters are set as follows: Light intensity: 80-200mW / cm 2 , irradiation distance: 5-15cm, curing time: 5-30 seconds.

[0030] Anti-counterfeiting function: Carbon quantum dot-microencapsulated spiropyran emits bright fluorescence under 365nm ultraviolet light and undergoes reversible thermochromic change (from red to blue) at 32°C±1°C, achieving dual anti-counterfeiting identification. Antibacterial function: ε-polylysine has an antibacterial rate of ≥99.5%. Pathogen detection function: HRP-labeled antibody-TMB microcapsules can quickly develop color (blue to yellow) within 3 seconds at 60°C, with a detection limit of ≤10 CFU / mL, for rapid on-site detection. Mechanical properties: Adhesion (cross-hatch method level 0), tensile strength ≥35MPa, and elongation at break ≥250%.

[0031] After UV curing, the coating forms a transparent film with a thickness of 5-8μm, which has long-lasting antibacterial effect (72h antibacterial rate ≥99%), anti-counterfeiting and traceability (fluorescence + thermochromism), on-site pathogen detection (completed in 5 minutes), environmental protection and safety (compliant with safety standards), and can be applied to various substrates such as film, fiber, paper, etc., and can be widely used in food, medicine, and daily chemical industrial packaging.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) Multifunctional integrated innovation: For the first time, the three functions of anti-counterfeiting, antibacterial and pathogen detection are integrated into a single coating, breaking through the limitation of single function of traditional packaging materials;

[0034] (2) Intelligent anti-counterfeiting technology: Carbon quantum dots-microencapsulated spiropyran achieve dual anti-counterfeiting features: 365nm ultraviolet light-excited fluorescence + 32°C thermochromic (red to blue), improving anti-counterfeiting reliability and preventing the migration of harmful substances;

[0035] (3) Rapid pathogen detection: HRP-labeled antibody-TMB microcapsules can develop color (blue to yellow) in 3 seconds at 60°C, with a detection limit of ≤10 CFU / mL, enabling efficient pathogen screening;

[0036] (4) Environmental protection and safety optimization: using bio-based antimicrobial agents (ε-polylysine) and biodegradable materials, which meet safety standards and do not cause the migration of harmful substances;

[0037] (5) Substrate adaptation and mechanical strengthening: Through the synergistic effect of modified polyurethane acrylate and crosslinking agent, the coating adhesion (grade 0), tensile strength (≥35MPa) and flexibility are improved, and it is suitable for various substrates such as films and fibers.

[0038] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] The coating of the present invention uses modified polyurethane acrylate as the main resin, and its molecular chain contains active groups to provide adhesion, and its own elasticity gives the coating mechanical properties. Ethoxyethoxyethyl acrylate and 1,6-hexanediol diacrylate are used as diluent monomers, the former reduces viscosity, and the latter improves leveling. Hydroxyethyl methacrylate participates in the reaction by increasing the distance between molecular chains, thereby increasing flexibility and adhesion. Multiple functional groups of trimethylolpropane triacrylate participate in the cross-linking reaction to form a three-dimensional cross-linked network to enhance mechanical properties. TPO photoinitiator. Ethyl acetate solvent. The introduced anti-counterfeiting component generates a signal under the dual stimulation of light and heat to achieve an anti-counterfeiting effect. The natural antibacterial agent gives the coating antibacterial properties, and the pathogen antibody microcapsules specifically bind to pathogens to achieve rapid and efficient detection. The slit coating method is used, 80-200mW / cm 2UV curing for 15 seconds. The coating thickness is controlled at 8-12μm, so that the carbon quantum dots-microencapsulated spiropyran can excite fluorescence under 65nm ultraviolet light and thermochromic at 32℃±1℃ (red→blue), realizing dual anti-counterfeiting identification. The antibacterial rate of ε-polylysine is ≥99.5%, and the HRP-labeled antibody-TMB microcapsule quickly develops color (blue→yellow) in 3 seconds at 60℃, with a detection limit of ≤10CFU / mL, which is suitable for rapid detection of pathogens in food, medicine and other fields. Adhesion (grid method level 0), tensile strength ≥5MPa, and elongation at break ≥250%, suitable for various substrates such as films and fibers. Environmental protection characteristics: no migration of harmful substances.

[0041] Example 1:

[0042] Formula composition: modified polyurethane acrylate: 60%, ethoxyethoxyethyl acrylate: 15%, 1,6-hexanediol diacrylate: 8%, hydroxyethyl methacrylate: 6%, trimethylolpropane triacrylate: 5%, ε-polylysine: 0.8%, carbon quantum dots-microencapsulated spiropyran: 0.3%, BYK-333: 0.3%, TPO (photoinitiator): 3%, BYK-190: 0.2%, SDS (surfactant): 0.2%, pathogen microcapsules: 3%, ethyl acetate: 6%.

[0043] Preparation method: Mix all ingredients according to the formula and stir evenly to prepare the coating. Slit coating method (die gap 10μm, coating speed 10m / min, coating thickness 6μm). UV curing (intensity 120mW / cm 2 , distance 10cm, time 15 seconds).

[0044]

[0045]

[0046] Table 1: Performance data table of implementation 1;

[0047] Example 2: Optimization of functional component ratios

[0048] Modified polyurethane acrylate: 60%, ethoxyethoxyethyl acrylate: 15%, 1,6-hexanediol diacrylate: 8%, hydroxyethyl methacrylate: 6%, trimethylolpropane triacrylate: 5%, BYK-333: 0.3%, TPO (photoinitiator): 3%, BYK-190: 0.2%, SDS (surfactant): 0.2%, ethyl acetate: 6%.

[0049] Functional component gradient experimental design:

[0050] 1. Anti-counterfeiting component (0.1-0.5wt% carbon quantum dots-spiropyran), BYK-190 0.1-0.5%, sodium lauryl sulfate 0.1-0.5%

[0051] 2. Antimicrobial component (0.2-1.2 wt% ε-polylysine)

[0052] 3. Detection components (1-5wt% pathogen microcapsules)

[0053]

[0054] Table 2: Performance data of implementation 2;

[0055] Example 3: Substrate Compatibility Test

[0056] Test conditions: According to the best formula obtained in Example 2, coating was carried out on different surfaces using a slot coating method (die gap 10 μm, coating speed 10 m / min, coating thickness 6 μm). UV curing (intensity 120 mW / cm 2 , distance 10cm, time 15 seconds).

[0057]

[0058]

[0059] Table 3: Performance data table of implementation 3;

[0060] Example 4: Environmental Adaptability Verification

[0061] The best formula and coating process of Example 2 were applied to PET film for harsh environment testing to broaden the application range of the coating.

[0062]

[0063]

[0064] Table 4: Performance data of implementation 4;

[0065] Example 5: Detection of different pathogens

[0066] In Examples 1-4, common Escherichia coli was selected as the pathogen for detection. However, in actual application, other pathogens are often present. Therefore, it is necessary to test whether the antibody microcapsules of other pathogens have a good response in the coating.

[0067] The formula composition follows the optimal formula of Example 2, and other pathogen antibodies can be replaced when preparing pathogen antibody microcapsules.

[0068] Pathogen type Color development time (s) Detection limit (CFU / mL) Escherichia coli 3.0 8.00 salmonella 2.8 7.8 Listeria 2.9 7.85 Staphylococcus aureus 3.1 8.01

[0069] Table 5 Performance data of implementation 5

[0070] The present invention has successfully developed a multifunctional intelligent packaging coating that integrates anti-counterfeiting, antibacterial and pathogen detection functions. Through innovative material formulation and process design, the three core functions are synergistically integrated. The coating uses a carbon quantum dot-spiropyran complex to construct a dual photothermal anti-counterfeiting system with a fluorescence intensity of 1250mcd / m 2 , the thermochromic response time is only 3 seconds; long-term antibacterial effect is achieved through ε-polylysine, and the inhibition rate against Escherichia coli and Staphylococcus aureus exceeds 99.7%; the innovative HRP-TMB microcapsule system can achieve rapid detection of pathogens, with a detection limit as low as 8 CFU / mL and a color development time of only 3 seconds. In terms of substrate adaptability, the coating exhibits excellent adhesion (grade 0), mechanical properties (tensile strength 34.5-40.1MPa, elongation at break 240-305%) and 90% functional retention rate (anti-counterfeiting, antibacterial, pathogens) on a variety of substrates such as PET, aluminum foil, and kraft paper. Environmental adaptability tests show that the coating can still maintain more than 90% performance stability under harsh conditions such as high temperature and humidity (85℃ / 85%RH, 500h), UV irradiation (1000h) and low temperature (-20℃, 30 days). Furthermore, the coating demonstrates excellent detection sensitivity for a variety of pathogens, including Salmonella and Listeria (detection limit 7.8-8.1 CFU / mL), demonstrating broad application prospects. The successful development of this technology provides an innovative material solution for the smart packaging sector. Its comprehensive performance indicators reach internationally leading levels, and it is ready for large-scale production. It has significant application value in high-end packaging applications such as food, pharmaceuticals, and electronic components. Future efforts will include developing a reversible color development system and introducing novel quantum dot materials to further enhance product performance.

[0071] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Industrial packaging coating that combines anti-counterfeiting, antibacterial and pathogen detection, characterized by: Includes the following components and contents: Modified polyurethane acrylate 55-65wt% Ethoxyethoxyethyl acrylate 10-20wt% 1,6-Hexanediol diacrylate 5-10wt% Hydroxyethyl methacrylate 5-8wt% Trimethylolpropane triacrylate 3-8wt% ε-polylysine 0.5-1.0wt% Carbon quantum dots-microencapsulated spiropyran 0.1-0.5wt% Water-based leveling agent 0.1-0.5wt% 2,4,6-Trimethylbenzoyldiphenylphosphine oxide 1-5wt% Dispersant 0.1-0.5wt% Sodium lauryl sulfate 0.1-0.5wt% Pathogen microcapsules 2-5% Ethyl acetate 5-8wt%.

2. The industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection according to claim 1, characterized in that: The water-based leveling agent is BYK-333; the dispersant is BYK-190.

3. The method for preparing an industrial packaging coating with anti-counterfeiting, antibacterial and pathogen detection functions according to any one of claims 1 to 2, characterized in that: The steps include: S1. Preparation of multifunctional coating precursor: Add 55-65wt% of modified polyurethane acrylate, 10-20wt% of ethoxyethoxyethyl acrylate, 5-10wt% of 1,6-hexanediol diacrylate, 5-8wt% of hydroxyethyl methacrylate, 3-8wt% of trimethylolpropane triacrylate, 0.1-0.5wt% of water-based leveling agent, 1-5wt% of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and 5-8wt% of ethyl acetate into a reaction container in proportion and stir evenly; S2. Preparation of carbon quantum dot-microencapsulated spiropyran for use as an anti-counterfeiting functional component: Activation of carbon quantum dots: disperse carbon quantum dots in deionized water, add 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS), and stir at room temperature at a low speed of 300 rpm for 1 hour; Surface modification of spiropyran microcapsules: spiropyran microcapsules were dispersed in ethanol, and aminosilane coupling agent KH-550 was added. The mixture was stirred at 400 rpm at 50°C for 2 hours. Amide bond grafting reaction: The activated carbon quantum dots and the modified spiropyran microcapsules were mixed at a ratio of 1:1.5 (w / w), deionized water was added, the pH was adjusted to 5-6, and the mixture was stirred at 300 rpm at room temperature for 4 hours to form a stable grafted complex; Chitosan encapsulation: Chitosan was dissolved in a 1% (v / v) acetic acid solution to prepare a 1.5% (w / v) solution, which was slowly added dropwise to the above-mentioned grafted composite dispersion at a rate of 1 mL / min, and stirred at 400 rpm for 2-3 hours. The pH was adjusted to 5-6. The chitosan was spray-dried at an inlet air temperature of 130°C and an outlet air temperature of 75°C to form an encapsulation layer with a thickness of ≤50 nm and a light-transmitting and air-permeable anti-counterfeiting functional component without affecting the function. S3. Preparation of pathogen microcapsules for use as pathogen detection functional components: Preparation of antibody-TMB mixture: HRP-labeled antibody was diluted to 2 mg / mL in PBS buffer (pH 7.4). TMB substrate was added at a ratio of 1:2 (v / v) and mixed gently. Microcapsule embedding: Slowly drop the antibody-TMB mixture into molten paraffin or beeswax and emulsify it with a homogenizer at 12000 rpm for 10 minutes to form microcapsules with a particle size of 10-15 μm; Cooling and solidification: The microcapsule emulsion was cooled in an ice bath until completely solidified, centrifuged at 4000 rpm for 8 minutes at 4°C, the supernatant was discarded, and the solution was washed three times with PBS buffer and stored at 4°C for later use; S4. Mix the functional components before coating: Adding anti-counterfeiting functional components: Mix the wrapped anti-counterfeiting functional components with ethanol, ultrasonicate for 30 seconds, add 0.2wt% of the coating, then add 0.2wt% of the dispersant BYK-190 and 0.3wt% of the anionic surfactant SDS, and stir at 400rpm for 10 minutes. Antimicrobial agent addition: 0.8 wt% of ε-polylysine was added to the coating and stirred at 400 rpm for 8 minutes; Adding pathogen microcapsules: Mix the pathogen microcapsules with ethanol, sonicate for 30 seconds, add 3 wt% to the coating, and stir at 400 rpm for 8 minutes to obtain a multifunctional composite coating; S5, coating the prepared multifunctional composite coating; S6. After the multifunctional composite coating is applied, it is cured by UV curing to obtain an industrial packaging coating that integrates anti-counterfeiting, antibacterial and pathogen detection.

4. The method for preparing an industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection according to claim 3, characterized in that: The coating in step S5 adopts the slit coating method, and the specific parameters are: Slot die gap setting value: 8-12μm; Coating speed: 8-15m / min; Paint temperature: 20-30℃; Substrate temperature: 25-35°C; Coating thickness: 5-8μm.

5. The method for preparing an industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection according to claim 3, characterized in that: The specific parameters of the UV curing method are: light intensity: 80-200mW / cm 2 , irradiation distance: 5-15cm, curing time: 5-30 seconds.

6. The method for preparing an industrial packaging coating integrating anti-counterfeiting, antibacterial and pathogen detection according to claim 3, characterized in that: The industrial packaging coating cured by the ultraviolet curing method is a transparent film with a thickness of 5-8 μm.

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