Laser holographic anti-counterfeiting film and preparation method thereof

Abstract

The application provides a laser holographic anti-counterfeiting film and a preparation method thereof. The laser holographic anti-counterfeiting film comprises a PC base film, a plating layer and a temperature-resistant layer arranged in sequence, and the PC base film is provided with a holographic anti-counterfeiting pattern. The application realizes stable maintenance of the holographic anti-counterfeiting pattern under high-temperature lamination at 180-200 DEG C, and simultaneously simplifies the preparation process and reduces the manufacturing cost.

Description

Technical Field

[0001] This invention belongs to the field of anti-counterfeiting printing technology, specifically relating to a laser holographic anti-counterfeiting film and its preparation method. Background Technology

[0002] Polycarbonate-based identification documents refer to identification documents made with polycarbonate (PC) material as the base material. These documents feature high security, durability, and excellent anti-counterfeiting properties.

[0003] Currently, there are two methods for fabricating laser holographic anti-counterfeiting patterns on polycarbonate documents: one is hot stamping, where a release layer, imaging layer, coating layer, and adhesive layer are first prepared on a PET substrate, then transferred to the surface of a polycarbonate film using hot stamping, and finally laminated to the interior of the polycarbonate document; the other is cold stamping, where a release layer, imaging layer, coating layer, and adhesive layer are first prepared on a PET substrate, then transferred to the surface of a polycarbonate film using cold stamping, and finally laminated to the interior of the polycarbonate document. Both methods involve cumbersome steps, complex processes, and high material and equipment costs. Summary of the Invention

[0004] In view of this, the present invention provides a laser holographic anti-counterfeiting film and its preparation method, which achieves stable maintenance of holographic anti-counterfeiting patterns under high temperature lamination at 180-200℃, while simplifying the preparation process and reducing the production cost.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: On one hand, the present invention provides a laser holographic anti-counterfeiting film, comprising a PC base film, a coating layer, and a heat-resistant layer arranged sequentially, wherein the PC base film is provided with a holographic anti-counterfeiting pattern.

[0006] Preferably, the material used to prepare the heat-resistant layer includes 10 parts by weight of high-hydroxyl-modified polyurethane resin, 40 parts by weight of tripropylene glycol diacrylate, 2 parts by weight of isophorone diisocyanate, 15 parts by weight of amine-modified polyether acrylate, 3 parts by weight of 1-hydroxycycloethylphenylacetone, 20 parts by weight of rosin, and 10 parts by weight of cyclohexanone.

[0007] Preferably, the high hydroxyl-modified polyurethane resin includes at least one of Lankeluo L-8463, L-8464 and L-8465.

[0008] Preferably, the amine-modified polyether acrylate includes at least one of BASF LR8894 and Sartoma CN551NS.

[0009] Preferably, the thickness of the PC base film is 50-100 μm.

[0010] Preferably, the thickness of the coating is 200-500 Å.

[0011] Preferably, the thickness of the heat-resistant layer is 3-5 μm.

[0012] On the other hand, the present invention provides a method for preparing the laser holographic anti-counterfeiting film, characterized by comprising the following steps: S1. Mold the holographic anti-counterfeiting pattern onto the PC base film; S2. Water-washable ink is printed on the side of the PC base film with the holographic anti-counterfeiting pattern, wherein the water-washable ink avoids the holographic anti-counterfeiting pattern; S3. A coating is applied to the water-washable ink, and the coating is also applied to the holographic anti-counterfeiting pattern; S4. A heat-resistant layer is provided on the side of the coating away from the water-washable ink, wherein the heat-resistant layer overlaps with the holographic anti-counterfeiting pattern; S5. Wash away the water-washed ink and the coating and heat-resistant layer that avoid the holographic anti-counterfeiting pattern.

[0013] Preferably, in step S2, the washable ink is printed using gravure printing.

[0014] Preferably, in step S3, a coating is formed by plating zinc sulfide or aluminum.

[0015] In some embodiments, the preparation method of laser holographic anti-counterfeiting film includes the following steps: First, a holographic anti-counterfeiting pattern (including a positioning and identification cursor) is molded onto a PC base film by hot molding; then, water-washable ink is printed on one side of the holographic anti-counterfeiting pattern at a location where the holographic anti-counterfeiting pattern is not needed, according to the positioning and identification cursor, using gravure printing; then, zinc sulfide or aluminum or other materials are deposited on the side of the water-washable ink by vapor deposition to form a coating layer; then, high-temperature resistant UV adhesive is locally printed on the side with the holographic anti-counterfeiting pattern molded on the side at the location of the desired holographic anti-counterfeiting pattern, according to the positioning and identification cursor, using screen printing, and a heat-resistant layer is formed after heat drying and UV curing; finally, the coating layer at the location of the water-washable ink is washed away by water washing.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention directly uses PC film as the base film and hot molding is performed on PC film to prepare holographic anti-counterfeiting patterns. Compared with the traditional preparation process, it eliminates the preparation of holographic anti-counterfeiting film with PET as base film and the secondary processing steps of cold stamping or hot stamping, which simplifies the preparation process and greatly reduces the production cost.

[0017] (2) This invention uses a high-hydroxyl-modified polyurethane resin, tripropylene glycol diacrylate, isophorone diisocyanate, amine-modified polyether acrylate, 1-hydroxycycloethylphenylacetone, rosin, and cyclohexanone as the main materials to create a heat-resistant UV adhesive layer, ensuring the stability of the holographic anti-counterfeiting pattern during high-temperature lamination at 180-200℃. This invention uses high-hydroxyl-modified polyurethane resin and isophorone diisocyanate to achieve thermal curing of the UV adhesive system. Simultaneously, tripropylene glycol diacrylate and amine-modified polyether acrylate enhance the temperature resistance of the UV-cured heat-resistant layer, ensuring the stability of the holographic anti-counterfeiting pattern during high-temperature lamination at 180-200℃. The amine-modified polyether acrylate improves the adhesion between the heat-resistant layer and the polycarbonate film. The addition of high-molecular-weight solvents rosin and cyclohexanone reduces the viscosity of the UV adhesive system, enabling the heat-resistant protective layer to fill the holographic anti-counterfeiting pattern structure, while also ensuring the stability of the materials during the screen printing process.

[0018] (3) The present invention uses screen printing and gravure printing registration printing processes to achieve the effect of local positioning coating, which ensures the interlayer adhesion of the card as a whole after card making. Attached Figure Description

[0019] Figure 1 The diagram shows the structure of the semi-finished laser holographic anti-counterfeiting film prepared before aluminum washing provided in Examples 1-3 and Comparative Examples 1-7 of this invention. Figure 2 The laser holographic anti-counterfeiting film for PC documents provided in Embodiments 1-3 and Comparative Examples 1-7 of this invention.

[0020] In the attached diagram, 100 is the semi-finished product of the laser holographic anti-counterfeiting film for PC documents prepared before the aluminum washing process; 110 is the PC base film; 111 is the holographic anti-counterfeiting pattern; 120 is the water-washable ink; 130 is the coating; 140 is the heat-resistant layer; and 200 is the laser holographic anti-counterfeiting film for PC documents. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to specific embodiments, so that those skilled in the art can more clearly understand the present invention.

[0022] Currently, there are two methods for fabricating laser holographic anti-counterfeiting patterns on polycarbonate documents: one is hot stamping, where a release layer, imaging layer, coating layer, and adhesive layer are first prepared on a PET substrate, then transferred to the surface of a polycarbonate film using hot stamping, and finally laminated to the interior of the polycarbonate document; the other is cold stamping, where a release layer, imaging layer, coating layer, and adhesive layer are first prepared on a PET substrate, then transferred to the surface of a polycarbonate film using cold stamping, and finally laminated to the interior of the polycarbonate document. Both methods involve cumbersome steps, complex processes, and high material and equipment costs.

[0023] To solve the above technical problems, combined with Figure 1-2 The present invention provides a laser holographic anti-counterfeiting film, comprising a PC base film 110, a coating layer 130, and a heat-resistant layer 140 arranged sequentially, wherein the PC base film 110 is provided with a holographic anti-counterfeiting pattern 111.

[0024] Furthermore, the materials used to prepare the heat-resistant layer 140 include 10 parts by weight of high-hydroxyl-modified polyurethane resin, 40 parts by weight of tripropylene glycol diacrylate, 2 parts by weight of isophorone diisocyanate, 15 parts by weight of amine-modified polyether acrylate, 3 parts by weight of 1-hydroxycycloethylphenylacetone, 20 parts by weight of rosin, and 10 parts by weight of cyclohexanone.

[0025] Furthermore, the high hydroxyl-modified polyurethane resin includes at least one of Lancolu L-8463, L-8464, and L-8465.

[0026] Furthermore, the amine-modified polyether acrylate includes at least one of BASF LR8894 and Sartoma CN551NS.

[0027] Furthermore, the thickness of the PC base film 110 is 50-100 μm.

[0028] Furthermore, the thickness of the coating 130 is 200-500 Å.

[0029] Furthermore, the thickness of the heat-resistant layer 140 is 3-5 μm.

[0030] On the other hand, the present invention provides a method for preparing the aforementioned laser holographic anti-counterfeiting film, comprising the following steps: S1. Mold the holographic anti-counterfeiting pattern 111 onto the PC base film 110; S2. Water-washable ink 120 is printed on the side of the PC base film 110 where the holographic anti-counterfeiting pattern 111 is provided, wherein the water-washable ink 120 avoids the holographic anti-counterfeiting pattern 111. S3. A coating 130 is applied to the water-washable ink 120, and the coating 130 is also applied to the holographic anti-counterfeiting pattern 111. S4. A heat-resistant layer 140 is provided on the side of the coating 130 away from the water-washable ink 120, wherein the heat-resistant layer 140 overlaps with the holographic anti-counterfeiting pattern 111; S5. Wash away the water-washable ink 120 and the coating 130 and heat-resistant layer 140 that avoid the holographic anti-counterfeiting pattern 111.

[0031] Further, in step S2, water-washable ink 120 is printed using gravure printing.

[0032] Further, in step S3, a coating 130 is formed by plating zinc sulfide or aluminum.

[0033] Example 1 This invention provides a laser holographic anti-counterfeiting film 200 for PC documents, which consists of a PC base film 110, a coating layer 130, and a heat-resistant layer 140 arranged sequentially from bottom to top. The PC base film 110 has a holographic anti-counterfeiting pattern 111. The high-temperature UV-resistant adhesive in the heat-resistant layer 140 includes: high hydroxyl-modified polyurethane resin Lankel L-8463 (10 parts), tripropylene glycol diacrylate (40 parts), isophorone diisocyanate (2 parts), amine-modified polyether acrylate Sardoma CN551NS (15 parts), 1-hydroxycycloethylphenylacetone (3 parts), rosin (20 parts), and cyclohexanone (10 parts).

[0034] The thickness of the PC base film 110 is 50 μm.

[0035] The thickness of the 140-temperature resistant layer is 3 μm.

[0036] The thickness of coating 130 is 200 Å.

[0037] Its preparation method includes the following steps: First, a holographic anti-counterfeiting pattern 111 (including a positioning and identification cursor) is molded onto a PC base film 110 using a hot-molding method. Then, using gravure printing, water-washable ink 120 is printed on one side of the holographic anti-counterfeiting pattern 111 at locations where the holographic anti-counterfeiting pattern 111 is not needed, based on the positioning and identification cursor. Next, zinc sulfide material is deposited on one side of the water-washable ink 120 using a vapor deposition method to form a coating 130. Then, using screen printing, high-temperature resistant UV adhesive is locally printed on the side with the molded holographic anti-counterfeiting pattern 111 at the desired locations based on the positioning and identification cursor. After heat drying and UV curing, a heat-resistant layer 140 is formed. Finally, the coating 130 at the locations where the water-washable ink 120 is printed is washed away using a water washing method. The resulting PC document laser holographic anti-counterfeiting film 200 provided by this invention is thus obtained.

[0038] Example 2 This invention provides a laser holographic anti-counterfeiting film 200 for PC documents, which consists of a PC base film 110, a coating layer 130, and a heat-resistant layer 140 arranged from bottom to top. The PC base film 110 has a holographic anti-counterfeiting pattern 111. The high-temperature UV resistant adhesive in the heat-resistant layer 140 includes: high hydroxyl modified polyurethane resin Lankel L-8464 (10 parts), tripropylene glycol diacrylate (40 parts), isophorone diisocyanate (2 parts), amine modified polyether acrylate BASF LR8894 (15 parts), 1-hydroxycycloethylphenylacetone (3 parts), rosin (20 parts), and cyclohexanone (10 parts).

[0039] The thickness of the PC base film 110 is 75 μm.

[0040] The thickness of the heat-resistant layer 140 is 4μm.

[0041] The coating thickness is 130 Å, which is 350 Å.

[0042] The preparation method includes the following steps: First, a holographic anti-counterfeiting pattern 111 (including a positioning and identification cursor) is molded onto a PC base film 110 by hot molding; then, using gravure printing, water-washable ink 120 is printed on one side of the holographic anti-counterfeiting pattern 111 at locations where the holographic anti-counterfeiting pattern 111 is not needed, according to the positioning and identification cursor; then, zinc sulfide material is deposited on one side of the water-washable ink 120 by vapor deposition to form a coating layer 130; then, high-temperature resistant UV adhesive is locally printed on the side with the holographic anti-counterfeiting pattern 111 molded on, according to the positioning and identification cursor, at the desired locations of the holographic anti-counterfeiting pattern 111, by screen printing, and after heat drying and UV curing, a heat-resistant layer 140 is formed; finally, the coating layer 130 at the locations where the water-washable ink 120 is printed is washed away by water washing. The resulting PC document laser holographic anti-counterfeiting film 200 is thus obtained.

[0043] Example 3 This invention provides a laser holographic anti-counterfeiting film 200 for PC documents, which consists of a PC base film 110, a coating layer 130, and a heat-resistant layer 140 arranged from bottom to top. The PC base film 110 has a holographic anti-counterfeiting pattern 111. The high-temperature UV resistant adhesive in the heat-resistant layer 140 includes: high hydroxyl-modified polyurethane resin Lankel L-8465 (10 parts), tripropylene glycol diacrylate (40 parts), isophorone diisocyanate (2 parts), amine-modified polyether acrylate BASF LR8894 (15 parts), 1-hydroxycycloethylphenylacetone (3 parts), rosin (20 parts), and cyclohexanone (10 parts).

[0044] The thickness of the PC base film 110 is 100 μm.

[0045] The thickness of the 140-temperature resistant layer is 5 μm.

[0046] The thickness of coating 130 is 500 Å.

[0047] First, a holographic anti-counterfeiting pattern 111 (including a positioning and identification cursor) is molded onto a PC base film 110 using a hot-molding method. Then, using gravure printing, water-washable ink 120 is printed on one side of the holographic anti-counterfeiting pattern 111 at locations where the holographic anti-counterfeiting pattern 111 is not needed, based on the positioning and identification cursor. Next, zinc sulfide material is deposited on one side of the water-washable ink 120 using a vapor deposition method to form a coating 130. Then, using screen printing, high-temperature resistant UV adhesive is locally printed on the side with the molded holographic anti-counterfeiting pattern 111 at the desired locations based on the positioning and identification cursor. After heat drying and UV curing, a heat-resistant layer 140 is formed. Finally, the coating 130 at the locations where the water-washable ink 120 is printed is washed away using a water washing method. The resulting PC document laser holographic anti-counterfeiting film 200 provided by this invention is thus obtained.

[0048] Comparative Example 1 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1, except that a temperature-resistant layer of 140°C is not provided.

[0049] Comparative Example 2 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1, except that it does not have water-washable ink 120 applied and is not washed with water.

[0050] Comparative Example 3 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1. The difference is that the UV adhesive in the temperature-resistant layer 140 does not contain high-hydroxyl-modified polyurethane resin.

[0051] Comparative Example 4 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1, except that the thickness of the temperature-resistant layer 140 is 7μm.

[0052] Comparative Example 5 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1. The difference is that the UV adhesive in the temperature-resistant layer 140 does not contain amine-modified polyether acrylate.

[0053] Comparative Example 6 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1. The difference is that the film contains: high hydroxyl-modified polyurethane resin Lankel L-8463 (20 parts), tripropylene glycol diacrylate (40 parts), isophorone diisocyanate (2 parts), amine-modified polyether acrylate (5 parts), Sartoma CN551NS, 2-hydroxycycloethylphenylacetone (3 parts), rosin (20 parts), and cyclohexanone (10 parts).

[0054] Comparative Example 7 This comparative example provides a laser holographic anti-counterfeiting film for PC documents. Its raw materials and steps are basically the same as those in Example 1. The difference is that the high hydroxyl-modified polyurethane resin (20 parts) is Lankel L-8465, tripropylene glycol diacrylate (20 parts), isophorone diisocyanate (12 parts), amine-modified polyether acrylate (5 parts) is BASF LR8894, 2-hydroxycycloethylphenylacetone (3 parts), rosin (20 parts), and cyclohexanone (10 parts).

[0055] Performance Tests and Results The PC cards prepared in Examples 1-3 and Comparative Examples 1-7 were laminated. The lamination test conditions were: lamination temperature 190℃, lamination time 30 minutes, and lamination pressure 1.5MPa. The obtained performance parameters are shown in Table 1.

[0056] Table 1

[0057] This invention provides a laser holographic anti-counterfeiting film 200 for PC documents, which directly uses a PC film as a base film to prepare a holographic anti-counterfeiting pattern 111 via hot molding. The preparation process is simple and low-cost. Simultaneously, it meets the lamination process requirements for PC document preparation. After lamination at 190°C for 30 minutes, the holographic anti-counterfeiting pattern 111 maintains good brightness, has a good appearance without cracks, and the prepared PC document shows no delamination.

[0058] Unless otherwise specified, all raw materials used in this invention are existing substances that can be purchased directly from the market.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laser holographic anti-counterfeiting film, characterized in that, It includes a PC base film, a coating, and a heat-resistant layer arranged in sequence, with a holographic anti-counterfeiting pattern in the PC base film.

2. The laser holographic anti-counterfeiting film according to claim 1, characterized in that, The materials used to prepare the heat-resistant layer include 10 parts by weight of high hydroxyl-modified polyurethane resin, 40 parts by weight of tripropylene glycol diacrylate, 2 parts by weight of isophorone diisocyanate, 15 parts by weight of amine-modified polyether acrylate, 3 parts by weight of 1-hydroxycycloethylphenylacetone, 20 parts by weight of rosin, and 10 parts by weight of cyclohexanone.

3. The laser holographic anti-counterfeiting film according to claim 2, characterized in that, The high hydroxyl-modified polyurethane resin includes at least one of Lankeluo L-8463, L-8464 and L-8465.

4. The laser holographic anti-counterfeiting film according to claim 2, characterized in that, The amine-modified polyether acrylate includes at least one of BASF LR8894 and Sartoma CN551NS.

5. The laser holographic anti-counterfeiting film according to claim 1, characterized in that, The thickness of the PC base film is 50-100 μm.

6. The laser holographic anti-counterfeiting film according to claim 1, characterized in that, The thickness of the coating is 200-500 Å.

7. The laser holographic anti-counterfeiting film according to claim 1, characterized in that, The thickness of the heat-resistant layer is 3-5 μm.

8. The method for preparing the laser holographic anti-counterfeiting film according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Mold the holographic anti-counterfeiting pattern onto the PC base film; S2. Water-washable ink is printed on the side of the PC base film with the holographic anti-counterfeiting pattern, wherein the water-washable ink avoids the holographic anti-counterfeiting pattern; S3. A coating is applied to the water-washable ink, and the coating is also applied to the holographic anti-counterfeiting pattern; S4. A heat-resistant layer is provided on the side of the coating away from the water-washable ink, wherein the heat-resistant layer overlaps with the holographic anti-counterfeiting pattern; S5. Wash away the water-washed ink and the coating and heat-resistant layer that avoid the holographic anti-counterfeiting pattern.

9. The preparation method according to claim 1, characterized in that, In step S2, water-washable ink is printed using gravure printing.

10. The preparation method according to claim 1, characterized in that, In step S3, a coating is formed by plating zinc sulfide or aluminum.

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