Anti-counterfeiting composite film with high barrier property and preparation process thereof

Abstract

The invention is applicable to the technical field of composite films, and provides an anti-counterfeiting composite film with high barrier property and a preparation process thereof.The anti-counterfeiting composite film comprises a base film, an anti-counterfeiting layer, a water-based varnish layer and a PVD protective layer, the base film is arranged on the bottommost layer of the anti-counterfeiting composite film, the PVD protective layer is arranged on the outermost layer of the anti-counterfeiting composite film, the anti-counterfeiting layer is arranged on the upper side of the base film, and the water-based varnish layer is arranged on the upper side of the PVD protective layer. The anti-counterfeiting layer is arranged on the upper side of the composite film, the water-based varnish layer is arranged on the upper side of the anti-counterfeiting layer, the PVD protective layer is arranged on the upper side of the water-based varnish layer, and due to the arrangement of the water-based varnish layer, the composite film has excellent film coating performance, almost has the same film coating performance as a solvent type polyurethane coating, and is very good in heat resistance, solvent resistance, drug corrosion resistance and wear resistance; the PVD protective layer is arranged on the surface of the composite film, so that a long-time tough film coating effect can be kept, and the PVD protective layer is arranged, so that the composite film has relatively good deformation capability in the stretching and extruding processes, is not easy to tear and has relatively good barrier property at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of composite films, and more specifically, to an anti-counterfeiting composite film with high barrier properties and a preparation process thereof. Background Art

[0002] The anti-counterfeiting technologies commonly used in the packaging field mainly include: microprinting, gravure printing, hot stamping, laser holographic anti-counterfeiting technology, 3D dynamic anti-counterfeiting technology, etc. The anti-counterfeiting ink technology mainly includes: fluorescent anti-counterfeiting ink, magnetic anti-counterfeiting ink, thermosensitive color-changing anti-counterfeiting ink, optical color-changing ink, etc.

[0003] There are many kinds of existing electronic products, and different products have different requirements for packaging materials. However, the existing packaging materials are too single and cannot meet the requirements of moisture barrier, oxygen barrier, heat insulation, and crack resistance. They do not have good high barrier properties, which will affect the use effect of existing composite films. Based on the above problems, an anti-counterfeiting composite film with high barrier properties and its preparation process are designed. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a composite film that has good deformation ability during stretching and extrusion and is not easy to be torn, while also making the composite film have good barrier properties, an anti-counterfeiting composite film with high barrier properties and a preparation process thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-barrier anti-counterfeiting composite film comprises a base film, an anti-counterfeiting layer, a water-based varnish layer and a PVD protective layer, wherein the base film is arranged at the bottom layer of the anti-counterfeiting composite film, the PVD protective layer is arranged at the outermost layer of the anti-counterfeiting composite film, the anti-counterfeiting layer is arranged on the upper side of the base film, the water-based varnish layer is arranged on the upper side of the anti-counterfeiting layer, and the PVD protective layer is arranged on the upper side of the water-based varnish layer.

[0007] A preparation process of an anti-counterfeiting composite film with high barrier properties comprises the following steps:

[0008] S1. preparing anti-counterfeiting raw materials;

[0009] S2, preparing water-based varnish;

[0010] S3, using an anilox roller engraved with an anti-counterfeiting mark to print the anti-counterfeiting material in step S1 onto the base film, while the coating speed is 16-19 m / min, the amount of the anti-counterfeiting material on the base film is 2 g / m, and after printing, it is transported to a drying box and dried at 60-80°C at a drying speed of 10 m / min, so that an anti-counterfeiting layer is formed on the base film;

[0011] S4, using a coating machine to coat the water-based varnish in step S2 on the base film printed with the anti-counterfeiting layer processed in step S3, and after printing, conveying it to a drying box, drying it at 60-65° C. at a drying speed of 5 m / min, to form a water-based varnish layer on the anti-counterfeiting layer;

[0012] S5, using a molding machine to perform molding treatment on the film of the water-based varnish layer obtained in step S4, with a pressure of 1 MPa and a roller speed of 10 m / min;

[0013] S6. By placing the film obtained in the above step S5 into a vacuum coating machine, the evaporated or sputtered atoms or molecules gradually cool down during flight and condense on the surface of the film to form a PVD protective layer, and finally an anti-counterfeiting composite film is obtained.

[0014] In one embodiment, in the step S1, a transparent connecting material, an auxiliary agent, an optical color-changing powder and a temperature-changing powder are selected and poured into a stirring device, and stirred at a medium speed for 10-12 minutes to obtain an anti-counterfeiting raw material.

[0015] In one embodiment, the weight percentage of the transparent connecting material is 60-65%, the weight percentage of the auxiliary agent is 5-8%, the weight percentage of the optical color-changing powder is 5-7%, and the weight percentage of the temperature-changing powder is 20-25%.

[0016] In one embodiment, in the step S2, the emulsion, negative ion water, wetting agent and leveling agent are sequentially placed into a disperser for low-speed dispersion and stirring for 8-10 minutes.

[0017] In one embodiment, the weight percentage of the emulsion is 80-85%, the weight percentage of the negative ion water is 5-8%, the weight percentage of the wetting agent is 1-3%, and the weight percentage of the leveling agent is 1-2%.

[0018] In one embodiment, the disperser adds a film-forming aid, a photoinitiator and a bactericidal and mildew-proof agent, and the disperser switches from low-speed dispersion to medium-speed dispersion, and performs medium-speed dispersion for 5-10 minutes at the same time, and finally adds alcohol and water to adjust the viscosity, and finally obtains a water-based scratch-resistant varnish.

[0019] In one embodiment, the weight percentage of the film-forming aid is 3-5%, the weight percentage of the photoinitiator is 2-5%, and the weight percentage of the bactericide and mildew preventer is 1-3%.

[0020] The advantages of the present invention are:

[0021] The present invention provides a water-based varnish layer so that the composite film has excellent coating properties, which are almost the same as those of solvent-based polyurethane coatings, and the heat resistance, solvent resistance, chemical corrosion resistance and wear resistance are all very good, and a tough coating effect can be maintained for a long time. The provision of the PVD protective layer enables the composite film to have good deformation ability during stretching and extrusion, and is not easy to be torn. At the same time, the composite film also has good barrier properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an anti-counterfeiting composite film with high barrier properties according to the present invention.

[0023] In the figure: 1. Base film; 2. Anti-counterfeiting layer; 3. Water-based varnish layer; 4. PVD protective layer. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0026] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0027] See also Figure 1 , the present invention provides the following technical solutions:

[0028] Specifically, it refers to an anti-counterfeiting composite film with high barrier properties, comprising a base film 1, an anti-counterfeiting layer 2, a water-based varnish layer 3 and a PVD protective layer 4, wherein the base film 1 is arranged at the bottom layer of the anti-counterfeiting composite film, the PVD protective layer 4 is arranged at the outermost layer of the anti-counterfeiting composite film, the anti-counterfeiting layer 2 is arranged on the upper side of the base film 1, the water-based varnish layer 3 is arranged on the upper side of the anti-counterfeiting layer 2, and the PVD protective layer 4 is arranged on the upper side of the water-based varnish layer 3;

[0029] By setting the water-based varnish layer 3, the composite film has excellent coating properties, which are almost the same as those of solvent-based polyurethane coatings. The heat resistance, solvent resistance, chemical corrosion resistance and wear resistance are all very good, and the tough coating effect can be maintained for a long time. The setting of the PVD protective layer 4 enables the composite film to have good deformation ability during stretching and extrusion, and is not easy to be torn. At the same time, the composite film also has good barrier properties.

[0030] The working principle of the anti-counterfeiting composite film with high barrier properties provided by the present invention is as follows: through the setting of the water-based varnish layer 3, the composite film has excellent coating properties, which are almost the same as the coating properties of the solvent-based polyurethane coating, and the heat resistance, solvent resistance, chemical corrosion resistance and wear resistance are all very good, and the tough coating effect can be maintained for a long time. The setting of the PVD protective layer 4 enables the composite film to have better deformation ability during stretching and extrusion, and is not easy to be torn. At the same time, the composite film also has better barrier properties.

[0031] According to the above scheme, the present invention designs a new process for preparing an anti-counterfeiting composite film with high barrier properties.

[0032] The specific steps are as follows:

[0033] S1. Prepare anti-counterfeiting raw materials, select transparent connecting material (65% by weight), auxiliary agent (5% by weight), optical color-changing powder (5% by weight) and temperature-changing powder (25% by weight), pour them into a stirring device, stir at medium speed for 10 minutes, and obtain the anti-counterfeiting raw materials;

[0034] S2, preparing water-based varnish;

[0035] S2-1, put the emulsion (85% by weight), negative ion water (5% by weight), wetting agent (1% by weight) and leveling agent (1% by weight) into a disperser in sequence and stir at a low speed for 10 minutes;

[0036] S2-2, add film-forming aid (5% by weight), photoinitiator (2% by weight) and bactericide and mildew-proof agent (1% by weight) into the disperser, switch the disperser from low-speed dispersion to medium-speed dispersion, and perform medium-speed dispersion for 5 minutes;

[0037] S2-3, finally adding alcohol and water to adjust the viscosity, and finally obtaining a water-based scratch-resistant varnish;

[0038] In the above three steps, the defoaming agent can reduce the surface tension of the emulsion and the negative ion water mixture, thereby preventing the formation of foam during the low-speed dispersion process. The wetting agent reduces the surface tension of the water-based varnish, so that the water-based varnish can be better spread on the surface of the film, thereby enhancing the use effect of the water-based varnish. At the same time, the leveling agent improves the permeability of the water-based varnish, reduces the possibility of spots and scars on the surface of the water-based varnish when it is used, and also improves the stability of the water-based varnish when it is dried and film-formed. The film-forming aid is a plasticizer that disappears easily, so it will not affect the material of the water-based varnish itself. The film-forming aid promotes the plastic flow and elastic deformation of the water-based varnish itself and improves the aggregation performance, thereby improving the stability of the water-based varnish when it is applied on the surface of the object and dried to form a film. The photoinitiator accelerates the speed of the water-based varnish when it is applied on the surface of the object and dried to form a film.

[0039] S3, using an anilox roller engraved with an anti-counterfeiting mark to print the anti-counterfeiting material onto the base film, while the coating speed is 16m / min, the amount of the anti-counterfeiting material on the base film is 2g / m, after printing, it is transported to a drying box, dried at 60°C, and the drying speed is 10m / min, so that an anti-counterfeiting layer is formed on the base film;

[0040] S4, using a coating machine to apply a water-based varnish on the base film with the anti-counterfeiting layer processed in step S3, and after printing, conveying it to a drying box, drying it at 60° C. at a drying speed of 5 m / min, to form a water-based varnish layer on the anti-counterfeiting layer;

[0041] S5, using a molding machine to perform molding treatment on the film of the water-based varnish layer obtained in step S4, with a pressure of 1 MPa and a roller speed of 10 m / min;

[0042] S6. By placing the film obtained in the above step S5 into a vacuum coating machine, the evaporated or sputtered atoms or molecules gradually cool down during flight and condense on the surface of the film to form a PVD protective layer, and finally an anti-counterfeiting composite film is obtained.

[0043] Embodiment 2

[0044] S1. Prepare anti-counterfeiting raw materials, select transparent connecting material (60% by weight), auxiliary agent (8% by weight), optical color-changing powder (5% by weight) and temperature-changing powder (20% by weight), pour them into a stirring device, stir at medium speed for 12 minutes, and obtain the anti-counterfeiting raw materials;

[0045] S2, preparing water-based varnish;

[0046] S2-1, put the emulsion (80% by weight), negative ion water (8% by weight), wetting agent (3% by weight) and leveling agent (1% by weight) into a disperser in sequence and stir at a low speed for 10 minutes;

[0047] S2-2, add film-forming aid (3% by weight), photoinitiator (5% by weight) and bactericide and mildew-proof agent (3% by weight) into the disperser, switch the disperser from low-speed dispersion to medium-speed dispersion, and perform medium-speed dispersion for 10 minutes;

[0048] S2-3, finally adding alcohol and water to adjust the viscosity, and finally obtaining a water-based scratch-resistant varnish;

[0049] S3, using an anilox roller engraved with an anti-counterfeiting mark to print the anti-counterfeiting material onto the base film, while the coating speed is 16m / min, the amount of the anti-counterfeiting material on the base film is 2g / m, after printing, it is transported to a drying box, dried at 80°C, and the drying speed is 10m / min, so that an anti-counterfeiting layer is formed on the base film;

[0050] S4, using a coating machine to apply a water-based varnish on the base film with the anti-counterfeiting layer processed in step S3, and after printing, conveying it to a drying box, drying it at 65° C. at a drying speed of 5 m / min, to form a water-based varnish layer on the anti-counterfeiting layer;

[0051] S5, using a molding machine to perform molding treatment on the film of the water-based varnish layer obtained in step S4, with a pressure of 3 MPa and a roller speed of 12 m / min;

[0052] S6. By placing the film obtained in the above step S5 into a vacuum coating machine, the evaporated or sputtered atoms or molecules gradually cool down during flight and condense on the surface of the film to form a PVD protective layer, and finally an anti-counterfeiting composite film is obtained.

[0053] Embodiment 3

[0054] S1. Prepare anti-counterfeiting raw materials, select transparent connecting material (63% by weight), auxiliary agent (6% by weight), optical color-changing powder (6% by weight) and temperature-changing powder (23% by weight), pour them into a stirring device, stir at medium speed for 10 minutes, and obtain the anti-counterfeiting raw materials;

[0055] S2, preparing water-based varnish;

[0056] S2-1, put the emulsion (83% by weight), anion water (5% by weight), wetting agent (3% by weight) and leveling agent (2% by weight) into a disperser in sequence and stir at a low speed for 10 minutes;

[0057] S2-2, add film-forming aid (3% by weight), photoinitiator (5% by weight) and bactericide and mildew-proof agent (2% by weight) into the disperser, switch the disperser from low-speed dispersion to medium-speed dispersion, and perform medium-speed dispersion for 5 minutes;

[0058] S2-3, finally adding alcohol and water to adjust the viscosity, and finally obtaining a water-based scratch-resistant varnish;

[0059] S3, using an anilox roller engraved with an anti-counterfeiting mark to print the anti-counterfeiting material onto the base film, while the coating speed is 19m / min, the amount of the anti-counterfeiting material on the base film is 2g / m, after printing, it is transported to a drying box, dried at 80°C, and the drying speed is 10m / min, so that an anti-counterfeiting layer is formed on the base film;

[0060] S4, using a coating machine to apply a water-based varnish on the base film with the anti-counterfeiting layer processed in step S3, and after printing, conveying it to a drying box, drying it at 65° C. at a drying speed of 5 m / min, to form a water-based varnish layer on the anti-counterfeiting layer;

[0061] S5, using a molding machine to perform molding treatment on the film of the water-based varnish layer obtained in step S4, with a pressure of 1 MPa and a roller speed of 10 m / min;

[0062] S6. By placing the film obtained in the above step S5 into a vacuum coating machine, the evaporated or sputtered atoms or molecules gradually cool down during flight and condense on the surface of the film to form a PVD protective layer, and finally an anti-counterfeiting composite film is obtained.

[0063] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-counterfeiting composite film with high barrier properties, comprising a base film (1), an anti-counterfeiting layer (2), a water-based varnish layer (3) and a PVD protective layer (4), characterized in that: The base film (1) is arranged on the bottom layer of the anti-counterfeiting composite film, the PVD protective layer (4) is arranged on the outermost layer of the anti-counterfeiting composite film, the anti-counterfeiting layer (2) is arranged on the upper side of the base film (1), the water-based varnish layer (3) is arranged on the upper side of the anti-counterfeiting layer (2), and the PVD protective layer (4) is arranged on the upper side of the water-based varnish layer (3).

2. A process for preparing an anti-counterfeiting composite film with high barrier properties, wherein the anti-counterfeiting composite film is the anti-counterfeiting composite film in claim 1, characterized in that: The following steps are involved: S1. preparing anti-counterfeiting raw materials; S2, preparing water-based varnish; S3, using an anilox roller engraved with an anti-counterfeiting mark to print the anti-counterfeiting material in step S1 onto the base film, while the coating speed is 16-19 m / min, and the amount of the anti-counterfeiting material on the base film is 2-4 g / m, and after printing, it is transported to a drying box and dried at 60-80° C., and the drying speed is 10-12 m / min, so that an anti-counterfeiting layer (2) is formed on the base film; S4, using a coating machine to coat the water-based varnish in step S2 on the base film printed with the anti-counterfeiting layer processed in step S3, and after printing, transporting it to a drying oven, drying it at 60-65° C. at a drying speed of 5-8 m / min, to form a water-based varnish layer (3) on the anti-counterfeiting layer (2); S5, using a molding machine to perform molding treatment on the film of the water-based varnish layer (3) obtained in step S4, with a pressure of 1-3 MPa and a roller speed of 10-12 m / min; S6. By placing the film obtained in the above step S5 into a vacuum coating machine, the evaporated or sputtered atoms or molecules gradually cool down during flight and condense on the surface of the water-based varnish layer (3) to form a PVD protective layer (4), and finally an anti-counterfeiting composite film is obtained.

3. The preparation process according to claim 2, characterized in that: In the step S1, a transparent connecting material, an auxiliary agent, an optical color-changing powder and a temperature-changing powder are selected and poured into a stirring device, and stirred at a medium speed for 10-12 minutes to obtain an anti-counterfeiting raw material.

4. The preparation process according to claim 3, characterized in that: The weight percentage of the transparent connecting material is 60-65%, the weight percentage of the auxiliary agent is 5-8%, the weight percentage of the optical color-changing powder is 5-7%, and the weight percentage of the temperature-changing powder is 20-25%.

5. The preparation process according to claim 3, characterized in that: In the step S2, the emulsion, negative ion water, wetting agent and leveling agent are sequentially placed into a disperser for low-speed dispersion and stirring for 8-10 minutes.

6. The preparation process according to claim 5, characterized in that: The weight percentage of the emulsion is 80-85%, the weight percentage of the negative ion water is 5-8%, the weight percentage of the wetting agent is 1-3%, and the weight percentage of the leveling agent is 1-2%.

7. The preparation process according to claim 5, characterized in that: The disperser is added with a film-forming aid, a photoinitiator and a bactericide and mildew-proof agent, and the disperser is switched from low-speed dispersion to medium-speed dispersion, and medium-speed dispersion is performed for 5-10 minutes at the same time, and finally alcohol and water are added to adjust the viscosity, and finally a water-based scratch-resistant varnish is obtained.

8. The preparation process according to claim 7, characterized in that: The weight percentage of the film-forming aid is 3-5%, the weight percentage of the photoinitiator is 2-5%, and the weight percentage of the bactericidal and mildewproof agent is 1-3%.

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