A transparent holographic anti-counterfeiting medium hot stamping film and its preparation method

Abstract

This invention relates to a transparent holographic anti-counterfeiting medium hot stamping film and its preparation method, belonging to the field of holographic anti-counterfeiting technology. The transparent holographic anti-counterfeiting medium hot stamping film comprises, in sequence, a polyester film, a release layer, a holographic anti-counterfeiting layer, a dielectric coating layer, an auxiliary printing layer, and a hot melt adhesive layer. This invention achieves the performance of the holographic anti-counterfeiting medium film applicable to various hot stamping methods, especially satisfying the application of continuous rotary hot stamping, while also possessing the characteristics of high transparency, good anti-counterfeiting effect, and clear hot stamping.

Description

Technical Field

[0001] This invention relates to a transparent holographic anti-counterfeiting medium hot stamping film and its preparation method, belonging to the field of holographic anti-counterfeiting technology. This invention achieves the performance of the holographic anti-counterfeiting medium film applicable to various hot stamping methods, especially satisfying the application of continuous rotary hot stamping, while also possessing the characteristics of high transparency, good anti-counterfeiting effect, and clear hot stamping. Background Technology

[0002] Holographic anti-counterfeiting media film possesses a unique transparent holographic laser effect that does not affect the base material's color, leading to increasingly diversified applications. Currently, it is used in various anti-counterfeiting labels and daily chemical products. However, due to current technological limitations, traditional holographic anti-counterfeiting media film struggles to achieve high-definition hot stamping transfer, especially rotary hot stamping, and also suffers from limited anti-counterfeiting identification capabilities. Therefore, achieving the application of holographic anti-counterfeiting media film through multiple hot stamping methods and adding invisible anti-counterfeiting measures represents a breakthrough technological innovation, enriching its functionality and further expanding its application areas, aligning with industry development trends. Summary of the Invention

[0003] The purpose of this invention is to provide a transparent holographic anti-counterfeiting medium hot stamping film and its preparation method, which can be applied to various hot stamping methods, especially satisfying the application of continuous rotary hot stamping, and has the characteristics of high transparency, good anti-counterfeiting effect and clear hot stamping.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A transparent holographic anti-counterfeiting medium hot stamping film is characterized by the following structural components: a polyester film, a release layer, a holographic anti-counterfeiting layer, a medium plating layer, an auxiliary printing layer, and a hot melt adhesive layer. The release layer has high transparency and can effectively separate from the polyester film under a certain peeling force. The holographic anti-counterfeiting layer can produce different anti-counterfeiting graphics and present different holographic laser effects based on different holographic nickel plates. The medium plating layer, without affecting the light transmittance of each coating layer, effectively shapes the grating graphics of the holographic anti-counterfeiting layer, preventing the holographic effect from fading. The auxiliary printing layer consists of two transparent coatings: an auxiliary anti-counterfeiting layer and an auxiliary protective layer. The auxiliary anti-counterfeiting layer adds ultraviolet recognition anti-counterfeiting performance to the holographic anti-counterfeiting layer, and the auxiliary protective layer prevents the hot melt adhesive coating process from affecting the application performance of the auxiliary anti-counterfeiting layer. The hot melt adhesive layer has high transparency, melts rapidly at a certain temperature, and can effectively adhere to the substrate under pressure.

[0006] The transparent holographic anti-counterfeiting medium hot stamping film as described in claim 1 is characterized in that:

[0007] 1) The polyester film is a non-corona biaxially oriented BOPET film with a thickness of 12-18 μm;

[0008] 2) The release layer is obtained by coating the release agent with a coating machine; the release agent includes, by mass parts: 2-8 parts carnauba wax, 1-5 parts methyl methacrylate, 1-5 parts maleic rosin resin, 0-2 parts beeswax, and 20-50 parts diluent.

[0009] The methyl methacrylate has a Tg of 45-50℃; the maleic rosin resin has a Tg of 45℃; and the diluent is a mixture of ethyl acetate, isobutyl ester, isopropanol, and polyoxypropylene ether in a mass ratio of 25:6:3:1.

[0010] 3) The holographic anti-counterfeiting layer is obtained by coating a moldable coating material with a coating machine and then performing a holographic molding process; the moldable coating material comprises, by weight parts: 5-15 parts of thermoplastic polyurethane resin, 3-8 parts of styrene resin, 1-5 parts of acrylic modified chloroacetic acid resin, 1-5 parts of rosin modified dammar resin, 0-3 parts of polysiloxane, 0-2 parts of titanate coupling agent, and 25-60 parts of diluent.

[0011] The thermoplastic polyurethane resin has a softening point of 110℃ and a tensile strength of 25 MPa; the styrene resin has a softening point of 115℃ and a tensile strength of 40 MPa; the acrylic-modified chloroacetic acid resin and the rosin-modified dammar resin have a Tg of around 50℃; and the diluent is a mixture of methyl ethyl ketone, n-propyl ester, and isobutyl ester in a mass ratio of 15:6:2.

[0012] 4) The dielectric coating is obtained by vapor deposition of the dielectric material using a high-vacuum coating equipment;

[0013] The medium material is a high refractive index material, and is any one of ZnS, SiO or Ni with a purity of 99.8% or higher.

[0014] 5) The auxiliary printing layer is formed by printing the auxiliary anti-counterfeiting coating and the auxiliary protective coating sequentially using a gravure printing machine, and is divided into an auxiliary anti-counterfeiting layer and an auxiliary protective layer;

[0015] The auxiliary anti-counterfeiting coating is a UV-curable acrylic resin coating with added organic ultraviolet fluorescent powder, wherein the average particle size of the organic ultraviolet fluorescent powder is about 1.5μm, the heat resistance is 245℃, and the oil absorption is 35-40 (g / 100g); the auxiliary protective coating is a water-based UV coating, with water-based polyvinyl butyral and water-based alkyd resin in a mass ratio of 5:2 as the base materials.

[0016] 6) The hot melt adhesive layer is obtained by coating the hot melt adhesive coating using a coating machine; the hot melt adhesive coating comprises, by weight parts: 2-10 parts of thermoplastic polyester resin, 2-6 parts of thermoplastic high-hydroxyl solid acrylic resin, 2-6 parts of thermosetting rosin-modified acrylic resin, 1-3 parts of hydroxypropyl methylcellulose, 10-35 parts of ethyl acetate, 10-25 parts of toluene, and 2-8 parts of pentanone;

[0017] The thermoplastic high-hydroxyl solid acrylic resin has a molecular weight of 10,000-20,000, a hydroxyl value of 135 mg KOH / g, and a Tg of 60°C.

[0018] The method for preparing a transparent holographic anti-counterfeiting medium hot stamping film as described in claim 1 is characterized by comprising the following steps:

[0019] 1) Using a coating machine, apply the release agent to the surface of the polyester film through a 240-260 mesh anilox roller, controlling the dry coating amount to 0.55-0.85 g / m². 2 A separation layer is obtained;

[0020] 2) Using a coating machine, apply the moldable coating to the surface of the release layer, controlling the oven temperature (90, 115, 135, 165, 155, 105) ±5℃, and controlling the dry coating amount to 1.30-1.65 g / m². 2 The coating shear strength is controlled at 0.5-0.8 MPa; then, a molding machine and a holographic nickel plate are used, with the temperature set at 170-200℃ and the pressure set at 7-10 MPa to obtain the holographic anti-counterfeiting layer.

[0021] 3) Using high vacuum coating equipment, any one of ZnS, SiO or Ni with a purity of 99.8% or higher is uniformly vapor-deposited onto the surface of the holographic anti-counterfeiting layer, and the thickness of the dielectric coating is controlled between 450-550 angstroms to obtain the dielectric coating.

[0022] 4) Using a gravure printing press: The auxiliary anti-counterfeiting coating is printed onto the surface of the substrate coating using a printing roller engraved with specific graphic information, controlling the dry coating amount to 0.45-0.55 g / m². 2 After UV curing, an auxiliary anti-counterfeiting layer is formed. The auxiliary protective coating is then printed onto the surface of the auxiliary anti-counterfeiting layer using a full-width printing roller without any graphic information, with the dry coating amount controlled at 0.35-0.45 g / m². 2 After UV curing, an auxiliary protective layer is formed;

[0023] 5) Using a coating machine, apply the hot melt adhesive coating to the surface of the auxiliary protective layer through a 200-220 mesh anilox roller, controlling the dry coating amount to 1.15-1.35 g / m². 2 A hot melt adhesive layer is obtained.

[0024] Compared with existing technologies, this invention enables the holographic anti-counterfeiting medium film to be applied in various hot stamping methods, especially satisfying the application of continuous hot stamping on a round-to-round basis. It also features high transparency, good anti-counterfeiting effect, and clear hot stamping. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments:

[0026] Example 1

[0027] A transparent holographic anti-counterfeiting medium hot stamping film is characterized by the following structural components: a polyester film, a release layer, a holographic anti-counterfeiting layer, a medium plating layer, an auxiliary printing layer, and a hot melt adhesive layer. The release layer has high transparency and can effectively separate from the polyester film under a certain peeling force. The holographic anti-counterfeiting layer can produce different anti-counterfeiting graphics and present different holographic laser effects based on different holographic nickel plates. The medium plating layer, without affecting the light transmittance of each coating layer, effectively shapes the grating graphics of the holographic anti-counterfeiting layer, preventing the holographic effect from fading. The auxiliary printing layer consists of two transparent coatings: an auxiliary anti-counterfeiting layer and an auxiliary protective layer. The auxiliary anti-counterfeiting layer adds ultraviolet-detectable invisible anti-counterfeiting performance to the holographic anti-counterfeiting layer, and the auxiliary protective layer prevents the hot melt adhesive coating process from affecting the application performance of the auxiliary anti-counterfeiting layer. The hot melt adhesive layer has high transparency, melts rapidly at a certain temperature, and can effectively adhere to the substrate under pressure.

[0028] Prepare the required materials according to the table below:

[0029]

[0030] A method for preparing a transparent holographic anti-counterfeiting hot stamping film, the specific steps of which are as follows:

[0031] 1) Using a coating machine, apply the release agent to the surface of the polyester film through a 240-260 mesh anilox roller, controlling the dry coating amount to 0.75-0.85 g / m². 2 A separation layer is obtained;

[0032] 2) Using a coating machine, apply the moldable coating to the surface of the release layer, controlling the oven temperature (90, 115, 135, 165, 155, 105) ±5℃, and controlling the dry coating amount to 1.35-1.50 g / m². 2 The coating shear strength is controlled at 0.55-0.65 MPa; then, a molding machine and a holographic nickel plate are used, with the temperature set at 180℃ and the pressure set at 8 MPa to produce a holographic anti-counterfeiting layer.

[0033] 3) Using high vacuum coating equipment, ZnS with a purity of 99.8% or higher is uniformly vapor-deposited onto the surface of the holographic anti-counterfeiting layer, and the thickness of the dielectric coating is controlled between 450-550 angstroms to obtain the dielectric coating.

[0034] 4) Using a gravure printing press: The auxiliary anti-counterfeiting coating is printed onto the surface of the substrate coating using a printing roller engraved with specific graphic information, controlling the dry coating amount to 0.45-0.55 g / m². 2 After UV curing, an auxiliary anti-counterfeiting layer is formed. The auxiliary protective coating is then printed onto the surface of the auxiliary anti-counterfeiting layer using a full-width printing roller without any graphic information, with the dry coating amount controlled at 0.35-0.45 g / m². 2 After UV curing, an auxiliary protective layer is formed;

[0035] 5) Using a coating machine, apply the hot melt adhesive coating to the surface of the auxiliary protective layer through a 200-220 mesh anilox roller, controlling the dry coating amount to 1.25-1.35 g / m². 2 A hot melt adhesive layer is obtained.

[0036] Example 2

[0037] A transparent holographic anti-counterfeiting medium hot stamping film is characterized by the following structural components: a polyester film, a release layer, a holographic anti-counterfeiting layer, a medium plating layer, an auxiliary printing layer, and a hot melt adhesive layer. The release layer has high transparency and can effectively separate from the polyester film under a certain peeling force. The holographic anti-counterfeiting layer can produce different anti-counterfeiting graphics and present different holographic laser effects based on different holographic nickel plates. The medium plating layer, without affecting the light transmittance of each coating layer, effectively shapes the grating graphics of the holographic anti-counterfeiting layer, preventing the holographic effect from fading. The auxiliary printing layer consists of two transparent coatings: an auxiliary anti-counterfeiting layer and an auxiliary protective layer. The auxiliary anti-counterfeiting layer adds ultraviolet-detectable invisible anti-counterfeiting performance to the holographic anti-counterfeiting layer, and the auxiliary protective layer prevents the hot melt adhesive coating process from affecting the application performance of the auxiliary anti-counterfeiting layer. The hot melt adhesive layer has high transparency, melts rapidly at a certain temperature, and can effectively adhere to the substrate under pressure.

[0038] Prepare the required materials according to the table below:

[0039]

[0040]

[0041] A method for preparing a transparent holographic anti-counterfeiting hot stamping film, the specific steps of which are as follows:

[0042] 1) Using a coating machine, apply the release agent to the surface of the polyester film through a 240-260 mesh anilox roller, controlling the dry coating amount to 0.55-0.65 g / m². 2A separation layer is obtained;

[0043] 2) Using a coating machine, apply the moldable coating to the surface of the release layer, controlling the oven temperature (90, 115, 135, 165, 155, 105) ±5℃, and controlling the dry coating amount to 1.55-1.65 g / m². 2 The coating shear strength is controlled at 0.65-0.80 MPa; then, a molding machine and a holographic nickel plate are used, with the temperature set at 190℃ and the pressure set at 10 MPa, to produce a holographic anti-counterfeiting layer.

[0044] 3) Using high vacuum coating equipment, SiO with a purity of 99.8% or higher is uniformly vapor-deposited onto the surface of the holographic anti-counterfeiting layer, and the thickness of the dielectric coating is controlled between 450-550 angstroms to obtain the dielectric coating.

[0045] 4) Using a gravure printing press: The auxiliary anti-counterfeiting coating is printed onto the surface of the substrate coating using a printing roller engraved with specific graphic information, controlling the dry coating amount to 0.45-0.55 g / m². 2 After UV curing, an auxiliary anti-counterfeiting layer is formed. The auxiliary protective coating is then printed onto the surface of the auxiliary anti-counterfeiting layer using a full-width printing roller without any graphic information, with the dry coating amount controlled at 0.35-0.45 g / m². 2 After UV curing, an auxiliary protective layer is formed;

[0046] 5) Using a coating machine, apply the hot melt adhesive coating to the surface of the auxiliary protective layer through a 200-220 mesh anilox roller, controlling the dry coating amount to 1.15-1.25 g / m². 2 A hot melt adhesive layer is obtained.

[0047] The transparent holographic anti-counterfeiting medium hot stamping film prepared through the above embodiments realizes the performance of the holographic anti-counterfeiting medium film that can be applied to various hot stamping methods, especially satisfying the application of continuous hot stamping on a round basis. At the same time, it has the characteristics of high transparency, good anti-counterfeiting effect and clear hot stamping.

[0048] From the test results: (1) Example 1 uses a polyester film with a thickness of 15μm, which is relatively conventional and suitable for flat-press hot stamping. In combination with the overall thickness of the product and the characteristics of the hot stamping method, the flat-press hot stamping temperature is controlled at 115-135℃ and the hot stamping pressure is controlled at 3-4Mpa. The rotary hot stamping temperature is controlled at 180-200℃ and the hot stamping pressure is controlled at 2-3Mpa. The following points need to be noted in the preparation process: The proportion of carnauba wax in the release agent formula should be appropriately increased, otherwise it will affect the hot stamping speed and clarity in the rotary hot stamping process. The proportion of styrene resin in the moldable coating formula should be controlled at a low level. Although it has excellent molding plasticity, it is easy to cause the coating shear strength to increase and the edge cutting to deteriorate. At the same time, the proportion of rosin-modified damask resin should be appropriately increased so that the holographic anti-counterfeiting layer is affected by the thickness of the polyester film. (2) Example 2 uses a 12μm thick polyester film, which is thinner and has excellent thermal conductivity for hot stamping, making it more suitable for rotary hot stamping and faster. Combining the overall thickness of the product and the characteristics of the hot stamping method, the flat-press hot stamping temperature is controlled at 110-125℃ and the hot stamping pressure is controlled at 3-4Mpa; the rotary hot stamping temperature is controlled at 170-190℃ and the hot stamping pressure is controlled at 2.5-3.5Mpa. The following points need to be noted in the preparation process: First, the proportion of maleic rosin resin in the release agent formula should be appropriately increased. Second, the proportion of thermoplastic polyurethane resin and styrene resin in the moldable coating should be increased to reduce the impact of the thinner polyester film on the molding plasticity and make the separation layer less prone to coating separation during the heating and pressurizing holographic molding process.

[0049] It should also be noted that, regardless of the implementation method, each coating must be a transparent coating that does not affect the optical effect; otherwise, the application performance of the present invention will be affected. It should also be noted that the hot melt adhesive material described in this invention does not require the addition of various additives during application compared to traditional technologies. The thermoplastic high-hydroxyl solid acrylic resin in the components can effectively improve the heat-pressing and edge-cutting properties of the adhesive layer, which is beneficial for meeting the application requirements of different hot stamping methods and improving hot stamping speed. The auxiliary anti-counterfeiting coating uses organic ultraviolet fluorescent powder with an average particle size of about 1.5μm, a heat resistance of 245℃, and an oil absorption of 35-40 (g / 100g). The auxiliary protective coating uses a series of technical measures based on water-based polyvinyl butyral and water-based alkyd resin in a mass ratio of 5:2, which are mainly determined by combining the requirements of coating transparency and hot stamping performance.

[0050] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various modifications and variations to the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the inventive concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A transparent holographic anti-counterfeiting hot stamping film, characterized in that, The structure consists of, in sequence, a polyester film, a release layer, a holographic anti-counterfeiting layer, a dielectric coating layer, an auxiliary printing layer, and a hot melt adhesive layer. The release layer has high transparency and can effectively separate from the polyester film under a certain peeling force. The holographic anti-counterfeiting layer can produce different anti-counterfeiting graphics and present different holographic laser effects based on different holographic nickel plates. The dielectric coating layer, without affecting the light transmittance of each coating layer, effectively shapes the grating graphics of the holographic anti-counterfeiting layer, preventing the holographic effect from fading. The auxiliary printing layer consists of two transparent coatings: an auxiliary anti-counterfeiting layer and an auxiliary protective layer. The auxiliary anti-counterfeiting layer adds ultraviolet-detectable invisible anti-counterfeiting performance to the holographic anti-counterfeiting layer, while the auxiliary protective layer prevents the hot melt adhesive coating process from affecting the application performance of the auxiliary anti-counterfeiting layer. The hot melt adhesive layer has high transparency, melts rapidly at a certain temperature, and can effectively bond to the substrate under pressure. 1) The polyester film is a non-corona biaxially oriented BOPET film with a thickness of 12-18 μm; 2) The release layer is obtained by coating the release agent with a coating machine; the release agent includes, by mass parts: 2-8 parts carnauba wax, 1-5 parts methyl methacrylate, 1-5 parts maleic rosin resin, 0-2 parts beeswax, and 20-50 parts diluent. The methyl methacrylate has a Tg of 45-50℃; the maleic rosin resin has a Tg of 45℃; and the diluent is a mixture of ethyl acetate, isobutyl ester, isopropanol, and polyoxypropylene ether in a mass ratio of 25:6:3:

1. 3) The holographic anti-counterfeiting layer is obtained by coating a moldable coating material with a coating machine and then performing a holographic molding process; the moldable coating material comprises, by weight parts: 5-15 parts of thermoplastic polyurethane resin, 3-8 parts of styrene resin, 1-5 parts of acrylic modified chloroacetic acid resin, 1-5 parts of rosin modified dammar resin, 0-3 parts of polysiloxane, 0-2 parts of titanate coupling agent, and 25-60 parts of diluent. The thermoplastic polyurethane resin has a softening point of 110℃ and a tensile strength of 25 MPa; the styrene resin has a softening point of 115℃ and a tensile strength of 40 MPa; the acrylic-modified chloroacetic acid resin and the rosin-modified dammar resin have a Tg of around 50℃; and the diluent is a mixture of methyl ethyl ketone, n-propyl ester, and isobutyl ester in a mass ratio of 15:6:

2. 4) The dielectric coating is obtained by vapor deposition of the dielectric material using a high-vacuum coating equipment; The medium material is a high refractive index material, and is any one of ZnS, SiO or Ni with a purity of 99.8% or higher. 5) The auxiliary printing layer is formed by printing the auxiliary anti-counterfeiting coating and the auxiliary protective coating sequentially using a gravure printing machine, and is divided into an auxiliary anti-counterfeiting layer and an auxiliary protective layer; The auxiliary anti-counterfeiting coating is a UV-curable acrylic resin coating with added organic ultraviolet fluorescent powder, wherein the average particle size of the organic ultraviolet fluorescent powder is about 1.5μm, the heat resistance is 245℃, and the oil absorption is 35-40 (g / 100g); the auxiliary protective coating is a water-based UV coating, with water-based polyvinyl butyral and water-based alkyd resin in a mass ratio of 5:2 as the base materials. 6) The hot melt adhesive layer is obtained by coating the hot melt adhesive coating using a coating machine; the hot melt adhesive coating comprises, by weight parts: 2-10 parts of thermoplastic polyester resin, 2-6 parts of thermoplastic high hydroxyl solid acrylic resin, 2-6 parts of thermosetting rosin-modified acrylic resin, 1-3 parts of hydroxypropyl methylcellulose, 10-35 parts of ethyl acetate, 10-25 parts of toluene, and 2-8 parts of pentanone; The thermoplastic high-hydroxyl solid acrylic resin has a molecular weight of 10,000-20,000, a hydroxyl value of 135 mgKOH / g, and a Tg of 60℃.

2. The method for preparing a transparent holographic anti-counterfeiting medium hot stamping film as described in claim 1, characterized in that, Includes the following steps: 1) Using a coating machine, apply the release agent to the surface of the polyester film through a 240-260 mesh anilox roller, controlling the dry coating amount to 0.55-0.85 g / m². 2 A separation layer is obtained; 2) Using a coating machine, apply the moldable coating to the surface of the release layer, controlling the oven temperature and the dry coating amount to 1.30-1.65 g / m². 2 The coating shear strength is controlled at 0.5-0.8 MPa; then, a molding machine and a holographic nickel plate are used, with the temperature set at 170-200℃ and the pressure set at 7-10 MPa, to obtain the holographic anti-counterfeiting layer. 3) Using high vacuum coating equipment, any one of ZnS, SiO or Ni with a purity of 99.8% or higher is uniformly vapor-deposited onto the surface of the holographic anti-counterfeiting layer, and the thickness of the dielectric coating is controlled between 450-550 angstroms to obtain the dielectric coating. 4) Using a gravure printing press: The auxiliary anti-counterfeiting coating is printed onto the surface of the substrate coating using a printing roller engraved with specific graphic information, controlling the dry coating amount to 0.45-0.55 g / m². 2 After UV curing, an auxiliary anti-counterfeiting layer is formed; The auxiliary protective coating is printed onto the surface of the auxiliary anti-counterfeiting layer using a full-width printing roller without any graphic or textual information, with the dry coating amount controlled at 0.35-0.45 g / m². 2 After UV curing, an auxiliary protective layer is formed; 5) Using a coating machine, apply the hot melt adhesive coating to the surface of the auxiliary protective layer through a 200-220 mesh anilox roller, controlling the dry coating amount to 1.15-1.35 g / m². 2 A hot melt adhesive layer is obtained.

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