Wear-resistant hot-pressing die coating, holographic anti-counterfeiting PE packaging film and preparation method

Abstract

The application belongs to the technical field of holographic anti-counterfeiting film, and more particularly relates to a wear-resistant hot-pressing die coating, a holographic anti-counterfeiting PE packaging film and a preparation method. The wear-resistant hot-pressing die coating is obtained by optimizing the compounding of a specific type and amount of thermoplastic film-forming resin, wear-resistant reinforcing resin, nano wear-resistant reinforcing agent and additives. The holographic master film made by applying the coating on the surface of a base film and then pressing a holographic pattern has excellent high-temperature resistance and is compatible with the surface of the PE film. By using the seamless die pressing technology provided by the application, the holographic pattern of the holographic master film can be directly copied to the surface of the PE film without the need for delamination or adhesive compounding. The holographic master film is not damaged and can be repeatedly used for die pressing more than 50 times. The holographic anti-counterfeiting PE packaging film has the characteristics of simple preparation process, high production efficiency, low production cost, environmental friendliness and the like. The holographic pattern on the surface of the holographic anti-counterfeiting PE packaging film is clear and has strong adhesion, and the holographic anti-counterfeiting PE packaging film has excellent anti-counterfeiting effect and long-term durability.

Description

Technical Field

[0001] This application belongs to the field of holographic anti-counterfeiting film technology, and more specifically, relates to a wear-resistant hot-press molding coating, a holographic anti-counterfeiting PE packaging film, and a preparation method thereof. Background Technology

[0002] With the increasing demand for anti-counterfeiting measures, holographic anti-counterfeiting technology is widely used in the packaging field due to its unique visual effects and difficulty in replication. Currently, traditional holographic anti-counterfeiting films mostly use polyester (PET) or biaxially oriented polypropylene (BOPP) as substrates, and the holographic pattern is directly transferred to the surface of the substrate through a molding process to form a holographic anti-counterfeiting layer.

[0003] However, in the packaging industry, polyethylene (PE) film has become one of the mainstream packaging materials due to its excellent flexibility, low cost, and recyclability. But PE film has poor temperature resistance and cannot withstand the high temperatures required by traditional molding processes. In addition, PE film has low surface energy and weak adhesion to holographic patterns, making it difficult to directly form firmly attached and high-precision holographic patterns using traditional molding processes.

[0004] To address this issue, existing technologies typically employ indirect transfer methods, such as heat transfer printing or adhesive lamination to transfer holographic patterns to PE film. The heat transfer printing process involves covering the pattern layer of a master film (with a PET or BOPP base film) with a release layer to create a heat-transferable transfer film. This transfer film is then bonded to the PE film, and high temperature and pressure are applied to specific areas using heat transfer equipment. This softens the release layer and allows the pattern layer to bond with the PE film surface. The base film is then peeled off, completing the pattern transfer. The adhesive lamination process involves coating the pattern layer of a specialized adhesive (such as hot melt adhesive, pressure-sensitive adhesive, or UV-curable adhesive) onto the master film (with a PET or BOPP base film). The adhesive-coated master film is then bonded to the PE film. After the adhesive has fully cured, the base film is peeled off the PE film surface. The holographic pattern is now firmly bonded to the PE film via the adhesive, thus completing the holographic pattern transfer. These methods are complex, costly, and pose environmental risks. In addition, the adhesion of the transferred holographic pattern is insufficient, and it is prone to problems such as peeling and blurring. The anti-counterfeiting effect and durability are poor, which restricts the promotion and application of holographic anti-counterfeiting technology in PE packaging.

[0005] Therefore, developing a process and corresponding products that can directly form high-precision, high-adhesion holographic patterns on the surface of PE film is of great significance for improving the anti-counterfeiting performance of packaging and reducing production costs. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this application is to provide a wear-resistant hot-press molding coating for holographic anti-counterfeiting, a holographic anti-counterfeiting PE packaging film and a preparation method, aiming to solve the problems of poor durability, short service life and poor compatibility with PE film surface of holographic master film made based on existing coatings, complex process, high cost and environmental hazards in preparing holographic anti-counterfeiting PE packaging film, and poor anti-counterfeiting effect and durability of the obtained holographic anti-counterfeiting PE packaging film.

[0007] To achieve the above objectives, in a first aspect, this application provides a wear-resistant hot-press molding coating, comprising the following components in parts by weight: 20-40 parts thermoplastic film-forming resin, 10-25 parts wear-resistant reinforcing resin, 5-15 parts nano wear-resistant reinforcing agent, 0.5-4 parts additives, and 40-60 parts solvent.

[0008] Preferably, the thermoplastic film-forming resin includes one or more of vinyl chloride-vinyl acetate copolymer, thermoplastic acrylic resin, and cellulose derivative.

[0009] Preferably, the above-mentioned vinyl chloride-vinyl acetate copolymer is a hydroxyl-modified vinyl chloride-vinyl acetate resin.

[0010] Preferably, the glass transition temperature of the above-mentioned thermoplastic acrylic resin is 90℃~170℃ and the weight-average molecular weight is 50000~200000g / mol.

[0011] Preferably, the cellulose derivative is one or more of cellulose acetate butyrate and cellulose propionate.

[0012] Preferably, the wear-resistant reinforcing resin has a weight-average molecular weight of 50,000 to 300,000 g / mol and a glass transition temperature of 80°C to 170°C, and is selected from one or more thermoplastic acrylic resins and ketone-aldehyde resins.

[0013] Preferably, the wear-resistant reinforcing agent is nano-inorganic oxide particles that have undergone surface organic modification treatment.

[0014] Preferably, the particle size of the above-mentioned nano-inorganic oxide particles is 10~50nm, and is selected from one or more of nano-silica, nano-alumina, and nano-silicon nitride.

[0015] Preferably, the above-mentioned additives include one or more of leveling agents, defoamers, and wetting and dispersing agents.

[0016] Preferably, the solvent is a ketone solvent, an ester solvent, an aromatic hydrocarbon solvent, or a mixture thereof.

[0017] Secondly, this application provides a method for preparing the above-mentioned wear-resistant hot-press molding coating, comprising the following steps: S1. The nano wear-resistant reinforcing agent, wetting and dispersing agent, part of the wear-resistant reinforcing resin, and part of the solvent are pre-dispersed and then ground to obtain a nano concentrated slurry. S2. Mix the thermoplastic film-forming resin and the remaining wear-resistant reinforcing resin in the remaining solvent until completely dissolved to obtain a resin solution. S3. Mix the above-mentioned nano-concentrated slurry and the resin solution evenly, then add leveling agent and defoamer and disperse evenly, and filter to obtain the above-mentioned wear-resistant hot-press molding coating.

[0018] Thirdly, this application provides a method for preparing holographic anti-counterfeiting PE packaging film using the above-mentioned wear-resistant hot-press molding coating, comprising the following steps: (1) The above-mentioned wear-resistant hot-press molding coating is applied to the surface of the substrate film, dried to form a holographic coating layer, and then rolled up to obtain a molding base film; (2) Holographic patterns are imprinted on the holographic coating layer of the above-mentioned molding base film using a pattern forming molding device, and a holographic master film is formed after cooling; (3) The PE film is first heated and softened by a pattern transfer molding device, and then it is aligned and bonded with the above-mentioned holographic master film to transfer the holographic pattern of the holographic master film to the surface of the PE film. (4) Separate the PE film with the completed holographic pattern transfer from the above-mentioned holographic master film, and then roll it up and cool it to obtain the above-mentioned holographic anti-counterfeiting PE packaging film.

[0019] Preferably, in step (2), the pattern forming molding device is a double-plate molding machine, the imprinting pressure is 15~20MPa, and the imprinting temperature is 170℃~180℃.

[0020] Preferably, in step (3), the pattern transfer molding device is a laser molding machine, the heating and softening temperature is 80℃~90℃, the transfer pressure is 20~30MPa, and the transfer speed is 30~50m / min.

[0021] Preferably, before transferring the PE film in step (3), the surface of the PE film is first subjected to corona treatment and / or coated with an acrylic coating.

[0022] Preferably, after obtaining the above-mentioned holographic anti-counterfeiting PE packaging film in step (4), an aluminum layer is vapor-deposited on the surface of the holographic pattern layer of the above-mentioned holographic anti-counterfeiting PE packaging film. More preferably, a varnish is coated on the surface of the above-mentioned aluminum layer.

[0023] Fourthly, this application provides a holographic anti-counterfeiting PE packaging film, which is prepared using the above method.

[0024] In summary, the technical solutions conceived in this application have the following main technical advantages compared with the prior art: (1) This application optimizes the composition of the wear-resistant hot-press molding coating by compounding suitable types and amounts of thermoplastic film-forming resin, wear-resistant reinforcing resin, nano-wear-resistant reinforcing agent and additives. This results in a holographic master film obtained after the wear-resistant hot-press molding coating is applied to the surface of the base film and holographic patterns are imprinted. The master film does not degrade under high-temperature molding and has excellent high-temperature resistance, while being compatible with the PE film surface. The master film is undamaged after holographic patterns are transferred by molding and can be repeatedly molded and used more than 50 times. This effectively solves the problems of traditional molding master films being easily damaged by high temperature or mechanical stress, requiring frequent replacement and resulting in high production costs. It significantly improves the service life of the holographic master film and greatly reduces the production cost of holographic anti-counterfeiting PE packaging film.

[0025] (2) The method for preparing holographic anti-counterfeiting PE packaging film provided in this application, through seamless molding technology, can directly replicate the holographic pattern of the master film onto the surface of the PE film without the need for a release layer or adhesive lamination, forming a continuous, seamless holographic pattern on the surface of the PE film. It has the characteristics of simple preparation process, high production efficiency, and environmental friendliness. At the same time, the holographic pattern on the surface of the prepared holographic anti-counterfeiting PE packaging film is clear and has strong adhesion, which effectively solves the problems of blurred holographic pattern, insufficient adhesion causing the pattern to fall off easily, resulting in poor anti-counterfeiting effect and short product life caused by the existing indirect transfer process. It significantly improves the anti-counterfeiting level and visual effect of holographic anti-counterfeiting PE packaging film, and has excellent anti-counterfeiting effect and long-term durability. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] In the description of this application, it should be understood that the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The symbol " / " in this document indicates that the related objects are in an "or" relationship; for example, A / B means A or B.

[0028] In the description of the embodiments in this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0030] This application provides a wear-resistant hot-press molding coating for holographic anti-counterfeiting, comprising the following components by weight: 20-40 parts thermoplastic film-forming resin, 10-25 parts wear-resistant reinforcing resin, 5-15 parts nano wear-resistant reinforcing agent, 0.5-4 parts additives, and 40-60 parts solvent.

[0031] In some embodiments, the thermoplastic resin includes one or more of vinyl chloride-vinyl acetate copolymer, thermoplastic acrylic resin, and cellulose derivative.

[0032] In some embodiments, the above-mentioned vinyl chloride-vinyl acetate copolymer is a hydroxyl-modified vinyl chloride-vinyl acetate resin, wherein the content of vinyl acetate (VAC) is 4% to 20%. In some embodiments, the above-mentioned thermoplastic acrylic resin has a glass transition temperature (Tg) of 90°C to 170°C and a weight-average molecular weight of 50,000 to 200,000 g / mol. In some embodiments, the above-mentioned cellulose derivative is one or more of cellulose acetate butyrate (CAB) and cellulose propionate (CAP). In specific embodiments, the above-mentioned cellulose acetate butyrate has an acetyl content of 12% to 15% and a butyryl content of 26% to 39%.

[0033] In some embodiments, the wear-resistant reinforcing resin is selected from one or more of thermoplastic acrylic resins and ketone-aldehyde resins with a molecular weight of 50,000-300,000 g / mol and a glass transition temperature of 80°C-170°C. This component has good compatibility with the thermoplastic film-forming resin and can significantly improve the hardness and rigidity of the coating film, making it one of the key components for improving wear resistance. In some embodiments, the wear-resistant reinforcing resin can be selected simultaneously with the thermoplastic film-forming resin as an acrylic resin. Utilizing its high molecular weight and high glass transition temperature, it can further synergistically enhance the hardness and wear resistance of the coating, thus playing a reinforcing role.

[0034] In some embodiments, the aforementioned wear-resistant reinforcing agent is a nano-inorganic oxide particle that has undergone surface organic modification treatment. This improves the dispersibility and compatibility of the nanoparticles in the organic resin system, prevents agglomeration, and forms an effective wear-resistant network in the coating film. It is understood that this application does not limit the source of the aforementioned wear-resistant reinforcing agent; it can be purchased from commercially available products or obtained by performing surface organic modification treatment on the nano-inorganic oxide particles in a laboratory. The reagents used in the aforementioned organic modification treatment can be, but are not limited to, silane coupling agents, stearic acid, aluminate coupling agents, etc.

[0035] In some embodiments, the particle size of the above-mentioned nano-inorganic oxide particles is 10-50 nm, and is selected from one or more of nano-silicon dioxide (SiO2), nano-alumina (Al2O3), and nano-silicon nitride (Si3N4).

[0036] In some embodiments, the above-mentioned additives include leveling agents, defoamers, and wetting and dispersing agents. In some embodiments, the wetting and dispersing agent can be a polymeric dispersant (e.g., BYK-16X series, BYK-111, BYK-2155, Disperbyk-110, etc.), which can effectively promote the deagglomeration and stable dispersion of nanoparticles in the coating through steric hindrance, thereby improving the stability of the coating. In some embodiments, the leveling agent can be, but is not limited to, BYK-307, BYK-333, BYK-354, BYK-361, etc. In some embodiments, the defoamer can be, but is not limited to, BYK-052, BYK-057, BYK-019, BYK-065, etc.

[0037] The solvents described above in this application can effectively dissolve the resin system. Those skilled in the art can design solutions based on the solubility of the resin system, as long as good storage stability and leveling properties of the coating are guaranteed, they are all within the scope of protection of this application. In some embodiments, the solvents are ketone solvents, ester solvents, aromatic hydrocarbon solvents, or mixtures thereof. The ketone solvents include, but are not limited to, cyclohexanone, acetone, butanone, and methyl ethyl ketone. The ester solvents include, but are not limited to, ethyl acetate, butyl acetate, n-propyl acetate, isopropyl acetate, tert-butyl acetate, and propylene glycol methyl ether acetate. The aromatic hydrocarbon solvents include, but are not limited to, toluene and xylene.

[0038] This application optimizes the composition of abrasion-resistant hot-press molding coatings by optimizing the compounding of specific types and amounts of thermoplastic film-forming resins, abrasion-resistant reinforcing resins, nano-abrasion-resistant reinforcing agents, and additives. This results in a holographic master film, after the coating is applied to the base film surface and a holographic pattern is imprinted, that does not degrade under high-temperature molding, exhibiting excellent high-temperature resistance and compatibility with the PE film surface. The master film remains undamaged after holographic pattern transfer via molding and can be reused more than 50 times. This effectively solves the problems of traditional molding master films being easily damaged by high temperatures or mechanical stress, requiring frequent replacements and leading to high production costs. It significantly extends the service life of the holographic master film and substantially reduces the production cost of holographic anti-counterfeiting PE packaging film.

[0039] On the other hand, this application provides a method for preparing the above-mentioned wear-resistant hot-press molding coating, comprising the following steps: S1. The above-mentioned nano wear-resistant reinforcing agent, part of the above-mentioned wear-resistant reinforcing resin, wetting and dispersing agent and part of the solvent are pre-dispersed and then ground to obtain nano concentrated slurry; S2. Mix the remaining wear-resistant reinforcing resin and the above-mentioned thermoplastic film-forming resin in the remaining solvent until completely dissolved to obtain a resin solution. S3. Mix the above-mentioned nano-concentrated slurry and the above-mentioned resin solution evenly, then add leveling agent and defoamer and disperse evenly, and filter to obtain the above-mentioned wear-resistant hot-press molding coating.

[0040] It is understood that this application does not specifically limit the method of pre-dispersion in step S1, and it can be, but is not limited to, mechanical stirring or magnetic stirring. In some embodiments, the stirring speed of the above-mentioned pre-dispersion can be 1200~1500 r / min, and the stirring time can be 20~30 min. Those skilled in the art can increase or decrease the stirring speed and extend or shorten the stirring time according to the different stirring methods and stirring equipment, as long as the components can be mixed evenly, all of which are within the protection scope of this application.

[0041] In some embodiments, in step S1, the fineness of the aforementioned nano-concentrated slurry is less than or equal to 15 μm, ensuring that the nano-agglomerates are effectively deagglomerated during the grinding stage, thereby eliminating large particles in the concentrate. This not only prevents re-settling or agglomeration when other components are added subsequently, ensuring the storage stability of the coating; at the same time, since the particle size is much smaller than visible light waves, it can eliminate light scattering phenomena caused by large particles or agglomerates, ensuring the transparency and clarity of the holographic molding coating; in addition, the nanoparticles of this fineness can be uniformly dispersed in the coating as grinding points, avoiding stress concentration caused by large particle agglomeration, preventing the coating from cracking or peeling off under stress, thereby ensuring the reliability and uniformity of the overall wear resistance performance.

[0042] In some embodiments, in step S2, to ensure that the wear-resistant reinforcing resin and the thermoplastic film-forming resin are fully dissolved in the solvent, they can be mixed under heating conditions. In some embodiments, the heating temperature can be 50°C to 60°C.

[0043] It is understood that this application does not specifically limit the method of uniform dispersion in step S3, and it can be, but is not limited to, ultrasonic dispersion, mechanical stirring, or magnetic stirring. In some embodiments, the stirring speed for uniform dispersion can be 300~500 r / min, and the stirring time can be 20~30 min. It should be understood that those skilled in the art can increase or decrease the stirring speed and extend or shorten the stirring time according to different dispersion methods and equipment, as long as the components are mixed uniformly, all of which are within the scope of protection of this application.

[0044] This application also provides a method for preparing holographic anti-counterfeiting PE packaging film using the above-mentioned wear-resistant hot-press molding coating, comprising the following steps: (1) The above-mentioned wear-resistant hot-press molding coating is applied to the surface of the substrate film, dried to form a holographic coating layer, and then rolled up to obtain a molding base film; (2) Holographic patterns are imprinted on the holographic coating layer of the above-mentioned molding base film using a pattern forming molding device, and a holographic master film is formed after cooling; (3) The PE film is first heated and softened by a pattern transfer molding device, and then it is aligned and bonded with the holographic master film to transfer the holographic pattern of the holographic master film to the surface of the PE film. (4) Separate the PE film with the completed holographic pattern transfer from the above-mentioned holographic master film, and then roll it up and cool it to obtain the above-mentioned holographic anti-counterfeiting PE packaging film.

[0045] This application does not limit the drying method described in step (1), as long as the solvent can be dried, it is within the scope of protection of this application. In some embodiments, the drying temperature can be 50°C to 80°C. It should be noted that this application does not limit the method of "applying" the wear-resistant hot-pressing coating to the substrate film. In some embodiments, the application can be, but is not limited to, calendering coating, brush coating, dipping, spraying, roller coating, and doctor blade coating.

[0046] In some embodiments, in step (2), the pattern forming molding device is a double-plate molding machine. In some embodiments, in step (2), the imprinting pressure is 15~20MPa, and the imprinting temperature is 170℃~180℃.

[0047] In some embodiments, in step (3), the pattern transfer molding device is a laser molding machine. In some embodiments, the heating and softening temperature is 80°C to 90°C. In some embodiments, the transfer pressure is 20 to 30 MPa, and the transfer speed is 30 to 50 m / min.

[0048] In some embodiments, before transferring the PE film, a pretreatment of the PE film is performed. This pretreatment includes corona treatment and / or coating the surface of the PE film with an acrylate coating. Corona treatment increases the surface tension of the PE film to at least 38 dyn / cm, enhancing the adhesion of the holographic pattern to the PE film surface. In some embodiments, the thickness of the acrylate coating on the PE film surface is 2-3 μm, further improving the bonding strength between the holographic pattern and the PE film.

[0049] In some embodiments, after obtaining the holographic anti-counterfeiting PE packaging film in step (4), an aluminum layer is vapor-deposited on the surface of the holographic pattern layer of the holographic anti-counterfeiting PE packaging film, which can enhance the holographic reflective effect of the holographic anti-counterfeiting PE packaging film. In some embodiments, the thickness of the aluminum layer can be 30~50nm.

[0050] In some embodiments, a clear varnish is applied to the surface of the aluminum layer to form a wear-resistant and scratch-resistant protective layer, while also improving the printability of the aluminum surface. In some embodiments, the thickness of the clear varnish can be 3~5μm.

[0051] The method for preparing holographic anti-counterfeiting PE packaging film provided in this application utilizes seamless molding technology, eliminating the need for a release layer or adhesive lamination. This allows for the direct replication of the holographic pattern from the holographic master film onto the surface of the PE film, forming a continuous, seamless holographic pattern. This method is characterized by its simple operation, high production efficiency, and environmental friendliness. The resulting holographic anti-counterfeiting PE packaging film exhibits clear holographic patterns with strong adhesion, effectively solving the problems of blurred holographic patterns, insufficient adhesion leading to easy pattern detachment, poor anti-counterfeiting effect, and short product lifespan caused by existing indirect transfer processes. This significantly improves the anti-counterfeiting level and visual effect of the holographic anti-counterfeiting PE packaging film, demonstrating excellent anti-counterfeiting performance and long-term durability.

[0052] This application also provides a holographic anti-counterfeiting PE packaging film, which is prepared by the above method.

[0053] It should be understood that materials of the same or similar type, model, quality, properties, or function as the reagents and instruments used in the following embodiments can be used to implement this application. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments are commercially available.

[0054] The following is an example: Example 1 The components and their weight proportions of the wear-resistant hot-press molding coating provided in this embodiment are shown in Table 1.

[0055] Table 1. Specific types and weight proportions of each component in the wear-resistant hot-pressed molding coating provided in Example 1.

[0056] The method for preparing the wear-resistant hot-press molding coating provided in this embodiment includes the following steps: (1) Preparation of nano-concentrated slurry: The above-mentioned nano wear-resistant reinforcing agent, 6 parts of wear-resistant reinforcing resin, the above-mentioned wetting and dispersing agent, and 25 parts of solvent (the weight ratio of ketone solvent, ester solvent and aromatic hydrocarbon solvent is 2:2:1) are put into a dispersion tank and stirred and pre-dispersed at a speed of 1500r / min for 30min. Then, it is transferred to a sand mill for grinding until the fineness is ≤15μm to obtain a stable nano-concentrated slurry.

[0057] (2) Preparation of resin solution: Add the remaining solvent to the dissolving vessel, and add the above thermoplastic film-forming resin and the remaining wear-resistant reinforcing resin in sequence under stirring conditions. Continue stirring and heating to 50°C until all resins are completely dissolved to obtain a clear and transparent resin solution.

[0058] (3) Preparation of mixture: The nano-concentrated slurry prepared in step (1) is slowly added to the resin solution prepared in step (2) under stirring conditions, and the mixture is mixed evenly to obtain a mixture.

[0059] (4) Paint preparation and filtration: Add leveling agent and defoamer to the mixture prepared in step (3), stir at 500 r / min for 20 min to fully disperse evenly; then filter with a 200 mesh screen to obtain wear-resistant hot-press molding coating.

[0060] Example 2 The components and their weight proportions of the wear-resistant hot-press molding coating provided in this embodiment are shown in Table 2, and its preparation method is the same as in Example 1.

[0061] Table 2. Specific types and weight proportions of each component in the wear-resistant hot-pressed coating provided in Example 2.

[0062] Example 3 The components and their weight proportions of the wear-resistant hot-press molding coating provided in this embodiment are shown in Table 3, and its preparation method is the same as in Example 1.

[0063] Table 3. Specific types and weight proportions of each component in the wear-resistant hot-pressed coating provided in Example 3.

[0064] Example 4 The components and their weight proportions of the wear-resistant hot-press molding coating provided in this embodiment are shown in Table 4, and its preparation method is the same as in Example 1.

[0065] Table 4. Specific types and weight proportions of each component in the wear-resistant hot-pressed coating provided in Example 4.

[0066] Comparative Example 1 The wear-resistant hot-pressing coating provided in this comparative example does not contain thermoplastic film-forming resin, and other parameters are the same as in Example 1.

[0067] Comparative Example 2 The wear-resistant hot-pressed coating provided in this comparative example does not contain wear-resistant reinforcing resin, and other parameters are the same as in Example 1.

[0068] Comparative Example 3 In the wear-resistant hot-press molding coating provided in this comparative example, the thermoplastic film-forming resin is a low-Tg methyl methacrylate-butyl acrylate copolymer (Tg is about 60°C), and other parameters are the same as in Example 1.

[0069] Comparative Example 4 In the wear-resistant hot-pressing coating provided in this comparative example, the wear-resistant reinforcing resin is a low molecular weight ketone-aldehyde resin (molecular weight of 5000 g / mol), and other parameters are the same as in Example 1.

[0070] Comparative Example 5 In the wear-resistant hot-pressed coating provided in this comparative example, the nano-wear-resistant reinforcing agent was not subjected to surface organic modification treatment, and other parameters were the same as in Example 1.

[0071] Application examples The wear-resistant hot-press molding coatings prepared in the above embodiments and comparative examples are used to prepare holographic anti-counterfeiting PE packaging films, including the following steps: (1) Fabrication of holographic master film The aforementioned wear-resistant hot-press molding coating is uniformly coated onto a clean PET substrate film (20 μm thick), dried in an 80°C~100°C oven to remove solvent, and then wound up to obtain a molding base film. A seamless holographic pattern is then imprinted onto the holographic coating layer of the molding base film using a double-plate molding machine (pressure 15~20 MPa, temperature 170°C~180°C) to form a holographic coating layer. After cooling, a holographic master film is formed.

[0072] (2) Preparation of holographic anti-counterfeiting PE packaging film The PE film and holographic master film are aligned and fed into the pattern transfer molding device. The molding temperature is set to 85°C (to prevent the PE film from melting), the molding pressure to 20~30MPa, and the molding speed to 40~50m / min. The PE film is first heated and softened, then aligned and bonded to the holographic master film for imprinting, transferring the holographic pattern from the master film to the surface of the PE film. After molding, the PE film and master film are automatically separated. The PE film with the holographic pattern layer on its surface is wound up and cooled to set, thus completing the holographic pattern molding and obtaining a holographic anti-counterfeiting PE packaging film.

[0073] Performance testing: a. Reusability of the holographic master film The holographic master film is reused for holographic pattern molding. After each molding, the surface condition of the holographic master film (including whether the holographic coating has cracks, adhesion, or peeling) and the imprinting effect of the imprinted pattern (including whether the imprinted pattern has defects or is clear) are observed in order to comprehensively evaluate its reusability.

[0074] b. Adhesion effect of the pattern layer on the holographic anti-counterfeiting PE film The adhesion between the pattern layer and the PE film was tested using the cross-cut test (according to ASTM standards). Specifically, a 1mm × 1mm cross-cut pattern was drawn on the pattern layer using a cross-cut knife, cutting down to the bottom of the pattern layer. Small fragments were then removed diagonally with a brush. 3M tape was then applied to the cut and pulled upwards. Finally, the condition of the cross-cut area was observed with a magnifying glass, and the adhesion of the pattern layer on the holographic anti-counterfeiting PE film was determined based on the degree of peeling.

[0075] The test results are shown in Table 5.

[0076] Table 5. Reusability of the holographic master film and adhesion effect of the holographic anti-counterfeiting PE packaging film prepared in the examples and comparative examples.

[0077] The test results show that the holographic master film made with the wear-resistant hot-press molding coating prepared in this application embodiment is undamaged after holographic pattern transfer by molding, and can be repeatedly molded and used more than 50 times. This effectively solves the problems of traditional molding master films being easily damaged by high temperature or mechanical stress, requiring frequent replacement and leading to high production costs for holographic anti-counterfeiting films. It significantly improves the service life of the holographic master film and greatly reduces the production cost of holographic anti-counterfeiting films. Furthermore, this application uses the above-mentioned holographic master film with seamless molding technology, eliminating the need for a release layer or adhesive lamination, to directly replicate the holographic pattern onto the PE film surface, forming a continuous, seamless holographic pattern on the PE film surface. This method is characterized by simple operation steps, high production efficiency, and environmental friendliness. Simultaneously, the holographic pattern on the surface of the holographic anti-counterfeiting PE packaging film obtained in this application embodiment is clear and the adhesion reaches level 5B. This effectively solves the problems of blurred holographic patterns and insufficient adhesion leading to easy pattern detachment caused by existing indirect transfer processes, resulting in poor anti-counterfeiting effects and short product lifespan. This significantly improves the anti-counterfeiting level and visual effect of the holographic anti-counterfeiting PE packaging film.

[0078] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wear-resistant hot-press molding coating, characterized in that, Based on parts by mass, it includes the following components: 20-40 parts thermoplastic film-forming resin, 10-25 parts wear-resistant reinforcing resin, 5-15 parts nano wear-resistant reinforcing agent, 0.5-4 parts additives, and 40-60 parts solvent.

2. The wear-resistant hot-press molding coating according to claim 1, characterized in that, The thermoplastic film-forming resin includes one or more of vinyl chloride-vinyl acetate copolymer, thermoplastic acrylic resin, and cellulose derivative.

3. The wear-resistant hot-press molding coating according to claim 2, characterized in that, The vinyl chloride-vinyl acetate copolymer is a hydroxyl-modified vinyl chloride-vinyl acetate resin; and / or, The thermoplastic acrylic resin has a glass transition temperature of 90℃~170℃ and a weight-average molecular weight of 50,000~200,000 g / mol; and / or, The cellulose derivative is one or more of cellulose acetate butyrate and cellulose propionate.

4. The wear-resistant hot-press molding coating according to claim 1, characterized in that, The wear-resistant reinforcing resin has a weight-average molecular weight of 50,000~300,000 g / mol and a glass transition temperature of 80℃~170℃, and is selected from one or more of thermoplastic acrylic resins and ketone-aldehyde resins; and / or, The wear-resistant reinforcing agent is nano-inorganic oxide particles that have undergone surface organic modification; and / or, The nano-inorganic oxide particles have a particle size of 10-50 nm and are selected from one or more of nano-silica, nano-alumina, and nano-silicon nitride.

5. The wear-resistant hot-press molding coating according to claim 1, characterized in that, The additives include one or more of leveling agents, defoamers, and wetting and dispersing agents; and / or, The solvent is a ketone solvent, an ester solvent, an aromatic hydrocarbon solvent, or a mixture thereof.

6. A method for preparing a wear-resistant hot-pressed coating as described in claim 5, characterized in that, Includes the following steps: S1. The nano wear-resistant reinforcing agent, the wetting and dispersing agent, a portion of the wear-resistant reinforcing resin, and a portion of the solvent are pre-dispersed, and then ground to obtain a nano concentrated slurry; S2. Mix the thermoplastic film-forming resin and the remaining wear-resistant reinforcing resin in the remaining solvent until completely dissolved to obtain a resin solution. S3. Mix the nano-concentrated slurry and the resin solution evenly, then add the leveling agent and the defoamer and disperse them evenly, and filter to obtain the wear-resistant hot-press molding coating.

7. A method for preparing holographic anti-counterfeiting PE packaging film using the wear-resistant hot-press molding coating according to any one of claims 1 to 5, characterized in that, Includes the following steps: (1) The wear-resistant hot-press molding coating is applied to the surface of the substrate film, dried to form a holographic coating layer, and then wound up to obtain a molding base film; (2) Holographic patterns are imprinted on the holographic coating layer of the molded base film using a pattern forming molding device, and a holographic master film is formed after cooling; (3) The PE film is first heated and softened by a pattern transfer molding device, and then it is aligned and bonded with the holographic master film to transfer the holographic pattern of the holographic master film to the surface of the PE film. (4) Separate the PE film with the completed holographic pattern transfer from the holographic master film, and then roll it up and cool it to obtain the holographic anti-counterfeiting PE packaging film.

8. The method according to claim 7, characterized in that, In step (2), the pattern forming molding device is a double-plate molding machine, the imprinting pressure is 15~20MPa, and the imprinting temperature is 170℃~180℃; and / or, In step (3), the pattern transfer molding device is a laser molding machine, the heating and softening temperature is 80℃~90℃, the transfer pressure is 20~30MPa, and the transfer speed is 30~50m / min.

9. The method according to claim 7, characterized in that, Before transferring the PE film in step (3), the surface of the PE film is first subjected to corona treatment and / or coated with an acrylic coating; and / or, After obtaining the holographic anti-counterfeiting PE packaging film in step (4), an aluminum layer is vapor-deposited on the surface of the holographic pattern layer of the holographic anti-counterfeiting PE packaging film; preferably, a varnish is coated on the surface of the aluminum layer.

10. A holographic anti-counterfeiting PE packaging film, characterized in that, It is prepared by the method described in any one of claims 7 to 9.

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