Personalized security printing film and method for producing the same

Abstract

The application discloses a kind of personalization anti-counterfeiting printing film and preparation method thereof, setting release structure layer below BOPET bearing layer, so that personalization anti-counterfeiting printing film can be directly torn off surface BOPET bearing layer and antistatic layer under the action of release structure layer after printing the personal information of certificate holder by digital printer and laminating into card with card base material, both can meet the demand of personalization anti-counterfeiting printing film through digital printer, and the influence of antistatic layer on light transmittance is reduced to minimum. The holographic pattern of personalization anti-counterfeiting printing film is inside the surface of the prepared certificate, which increases the anti-counterfeiting visual performance of the certificate. In addition, the application realizes the bonding force between the enhanced reflection enhancement medium layer and the PET bearing layer through the component design of structural adhesive.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-counterfeiting film, and particularly to a personalized anti-counterfeiting printing film and a preparation method thereof. BACKGROUND

[0002] At present, the PVC and PET printing film products on the domestic and international markets must be assisted by an anti-static layer with a certain thickness to ensure smooth printing. The anti-static layer reduces the light transmittance of the printing film and the color performance of the holographic image, affecting the reading of the certificate information and the anti-counterfeiting performance.

[0003] In the holographic film, a reflection enhancement medium is added to increase the diffraction efficiency of the holographic image. The transparent medium is generally an inorganic oxide or sulfide, while PET is a polymer and belongs to an organic substance. The two materials have poor compounding ability and are prone to cracking during the use of the certificate.

[0004] Therefore, it is necessary to design a personalized anti-counterfeiting printing film with excellent holographic image effect performance and good adhesion of the reflection enhancement medium to the printing substrate. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application aims to provide a personalized anti-counterfeiting printing film.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A preparation method of a personalized anti-counterfeiting printing film, the specific process being as follows:

[0008] S1. Preparing a miscible solvent with anti-static performance;

[0009] S2. Coating the miscible solvent obtained in step S1 on the top surface of the BOPET carrier layer by spraying, rolling or flow casting to form an anti-static layer;

[0010] S3. Heating a cellulose diacetate solution, and forming a release structure layer on the bottom surface of the BOPET carrier layer by flow coating the heated cellulose diacetate solution;

[0011] S4. Pre-designing a holographic pattern, and using a photolithography technology to manufacture a nickel plate with interference and diffraction effects to obtain a nickel plate with the holographic pattern;

[0012] S5. Flow coating an acrylic resin on the bottom surface of the release structure layer to form an acrylic resin coating layer;

[0013] S6. Transferring the holographic pattern of the nickel plate to the bottom surface of the acrylic resin coating layer by hot pressing to obtain an optical structure layer;

[0014] S7. Performing corona treatment on the bottom surface of the optical structure layer;

[0015] S8, forming a reflection-enhancing medium layer on the bottom surface of the optical structure layer after the corona treatment by vacuum coating technology;

[0016] S9, coating a structural adhesive on the top surface of the PET carrier layer, and combining the top surface of the PET carrier layer with the bottom surface of the reflection-enhancing medium layer; additionally, preparing a digital printing suitable agent, and coating the digital printing suitable agent on the bottom surface of the PET carrier layer to form a printing coating layer, thereby obtaining a finished personalized anti-counterfeiting printing film.

[0017] Further, in step S1, the miscible solvent with anti-static performance is prepared from the following components: 10wt% of anti-static agent, 20wt% of anti-static polymeric resin, 5wt% of surfactant, 3wt% of ion exchanger, 60wt% of cosolvent, and 2wt% of metal powder.

[0018] Further, the specific process of step S3 is as follows: dissolving cellulose diacetate in ethyl acetate solvent, then introducing into the barrel of a film casting device, heating the cellulose diacetate solution in the barrel to 50-70℃, and then casting on the bottom surface of the BOPET carrier layer to form a release structure layer, with a casting thickness of 7-10μm.

[0019] Further, the specific process of step S4 is as follows: using computer-aided design software to create the required holographic pattern according to the needs and design requirements, then using photolithography technology to engrave the designed holographic pattern on the photoresist film of a photomask, then immersing the photomask in a nickel salt solution, depositing nickel on the surface of the photomask through electrochemical reaction, and removing the photoresist film to obtain a nickel plate; using a laser beam to irradiate the nickel plate to excite the optical effect on the surface of the nickel; the laser beam interacts with the surface of the nickel to produce interference and diffraction effects, and finally a nickel plate with a holographic pattern is obtained.

[0020] Further, the specific process of step S5 is as follows: dissolving acrylic resin in methyl ethyl ketone solvent at a mass ratio of 1:1.7, and heating to 120-200℃, then casting on the bottom surface of the release structure layer 6 to form an acrylic resin coating layer with a thickness of 1-2μm.

[0021] Further, the specific process of step S6 is as follows: placing the prepared nickel plate with a holographic pattern on the bottom surface of the acrylic resin coating layer obtained by heating coating, ensuring that the nickel plate is in close contact with the surface of the acrylic resin coating layer; applying appropriate pressure to transfer the holographic pattern on the nickel plate to the bottom surface of the acrylic resin coating layer; then using ultraviolet irradiation or heat curing to cure the acrylic resin coating layer; thereby forming a micro-nano optical structure pattern on the bottom surface of the acrylic resin coating layer, constituting an optical structure layer.

[0022] Further, in step S8, the reflection enhancement medium comprises any one or several of Al, Zn, Gu, Ag, Au, Cr, or an oxide or sulfide of any one or several of Al, Zn, Gu, Ag, Au, Cr; the reflection enhancement medium is loaded on the bottom surface of the optical structure layer by vacuum plating technology, forming a metal mesh point at the position of the pattern and controlling the density, so that light is reflected at the position of the pattern, and light is transmitted at the position of the non-pattern, without affecting the display of the information printed on the printed coating subsequently.

[0023] Further, in step S9, the digital printing suitable agent comprises the following components: 68wt% of water-based acrylic resin, 24.5wt% of meteorological silicon dioxide, 2wt% of antioxidant, 4wt% of toner fixing agent, and 1.5wt% of viscosity adjusting agent.

[0024] Still further, the structural adhesive is made of the following components: 50wt% of epoxy resin, 31wt% of polyether polyol, 5wt% of polyisocyanate, and 14wt% of catalyst, solvent and diluent.

[0025] The application also provides a personalized anti-fake printing film prepared by the above method.

[0026] The application has the following beneficial effects:

[0027] 1. By using the application, the influence of the anti-static layer on the diffraction efficiency of the holographic image can be avoided. Specifically, by arranging the release structure layer below the BOPET bearing layer, the personalized anti-fake printing film can directly tear off the surface BOPET bearing layer and the anti-static layer under the action of the release structure layer after the personal information of the certificate holder is printed by the digital printer and the card base material is laminated into a card, which can not only meet the demand of the personalized anti-fake printing film passing through the digital printer, but also reduce the influence of the anti-static layer on the light transmittance to the minimum.

[0028] 2. In the application, after the certificate product is prepared, the holographic pattern of the personalized anti-fake printing film is located on the inner side of the surface of the certificate, thereby increasing the anti-fake visualization performance of the certificate.

[0029] 3. The application realizes the enhancement of the bonding force between the reflection enhancement medium layer and the PET bearing layer by the component design of the structural adhesive. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The flow chart of the preparation method in the embodiment of the application;

[0031] Figure 2 The structural schematic diagram of the personalized anti-fake printing film prepared in the embodiment of the application. DETAILED DESCRIPTION

[0032] The application will be further described below in conjunction with the drawings. It should be noted that the embodiments are based on the technical solutions and give detailed implementation manners and specific operation processes, but the protection scope of the application is not limited to the embodiments.

[0033] The embodiment provides a preparation method of a personalized anti-fake printing film, as shown in the figure, and the specific process is as follows. Figures 1-2

[0034] S1, preparing a mixed solvent with anti-static performance;

[0035] S2, coating the mixed solvent obtained in step S1 on the top surface of the BOPET supporting layer 7 by spraying, roller coating or flow coating to form an anti-static layer 8;

[0036] S3, heating the cellulose diacetate solution, and forming a release structure layer 6 on the bottom surface of the BOPET supporting layer 7 by using the heated cellulose diacetate solution to form a release structure layer 6;

[0037] S4, designing a holographic pattern in advance, using a photoetching technology to manufacture a nickel plate with interference and diffraction effects, and obtaining the nickel plate with the holographic pattern;

[0038] S5, spraying acrylic resin on the bottom surface of the release structure layer 6 to form an acrylic resin coating layer;

[0039] S6, transferring the holographic pattern of the nickel plate to the bottom surface of the acrylic resin coating layer by hot pressing to obtain an optical structure layer 5;

[0040] S7, performing corona treatment on the bottom surface of the optical structure layer 5;

[0041] S8, forming a reflection-enhancing medium layer 4 on the bottom surface of the optical structure layer 5 after the corona treatment by using a vacuum plating technology;

[0042] S9, coating a structural adhesive 3 on the top surface of the PET supporting layer 2 by using a gravure coating or doctor blade coating method, and combining the top surface of the PET supporting layer 2 with the bottom surface of the reflection-enhancing medium layer 4; in addition, a digital printing agent is prepared, and the digital printing agent is coated on the bottom surface of the PET supporting layer 2 to form a printing coating layer 1, so that a finished personalized anti-fake printing film is obtained, and the combined structure is as shown in the figure. Figure 2

[0043] It should be noted that the order of coating the structural adhesive and combining and coating the printing coating layer can be exchanged.

[0044] In the embodiment, the BOPET supporting layer 7 is a transparent BOPET film with a thickness of 40-50 μm.

[0045] In the embodiment, the mixed solvent with anti-static performance in step S1 is prepared from the following components:​​

[0046] Antistatic agent 10wt%,

[0047] Antistatic polymeric resin 20wt%

[0048] Surfactant 5wt%

[0049] Ion exchanger 3wt%

[0050] Cosolvent 60wt%

[0051] Metal powder 2wt%.

[0052] The metal powder can be aluminum powder, nickel powder, or other metal powder with low hardness. The antistatic agent can be polyvinyl alcohol (PVA), polyacrylamide (PAA), or other polymer.

[0053] It should be noted that the cosolvent can reduce or eliminate the accumulation of static electricity on the surface of the material, and achieve the antistatic effect by changing the electrical conductivity or charge distribution of the material.

[0054] In this embodiment, the specific process of step S2 is to heat the cosolvent to 80-100°C, stir it evenly, and then use spraying, rolling, or casting to coat the top surface of the BOPET carrier layer 7 to form an antistatic layer 8, with a coating thickness of 15-20μm.

[0055] In this embodiment, the specific process of step S3 is to dissolve the cellulose diacetate in ethyl acetate solvent, then introduce it into the hopper of the film casting equipment, heat the cellulose diacetate solution in the hopper to 50-70°C, and then cast it on the bottom surface of the BOPET carrier layer 7 to form a release structure layer 6. The casting thickness is 7-10μm.

[0056] In this embodiment, the specific process of step S4 is to use computer-aided design software to create the required holographic pattern according to the needs and design requirements, then use photolithography to etch the designed holographic pattern on the photoresist film of the photomask, then immerse the photomask in a nickel salt solution, deposit nickel on the surface of the photomask through electrochemical reaction, and after removing the photoresist film, obtain a nickel plate with only nickel; use a laser beam to irradiate the nickel plate to excite the optical effect on the surface of the nickel; the laser beam interacts with the surface of the nickel, producing interference and diffraction effects, and finally obtaining a nickel plate with a holographic pattern.

[0057] In this embodiment, the specific process of step S5 is to dissolve the acrylic resin in the methyl ethyl ketone (MEK) solvent in a mass ratio of 1:1.7, heat it to 120-200°C, and then cast it on the bottom surface of the release structure layer 6 to form an acrylic resin coating with a thickness of 1-2μm.

[0058] In the present embodiment, the specific process of step S6 is as follows: the prepared nickel plate with holographic pattern is placed on the bottom surface of the obtained acrylic resin coating layer, and the nickel plate is ensured to be in close contact with the surface of the acrylic resin coating layer. An appropriate amount of pressure is applied using appropriate tools (such as a stamping machine) to transfer the holographic pattern on the nickel plate to the bottom surface of the acrylic resin coating layer. The pressure is ensured to be uniform, and the pressure is maintained for a certain period of time to ensure complete transfer of the pattern. Then, the acrylic resin coating layer is cured by ultraviolet irradiation or thermal curing. In this way, the bottom surface of the acrylic resin coating layer forms a micro-nano optical structure pattern, constituting the optical structure layer 5.

[0059] In the present embodiment, in step S8, the reflection enhancement medium includes any one or several of Al, Zn, Gu, Ag, Au, Cr, or oxides or sulfides of one or several of Al, Zn, Gu, Ag, Au, Cr; the reflection enhancement medium is loaded on the bottom surface of the optical structure layer 5 by vacuum plating technology, forming metal dots at the positions of the pattern and controlling the density, so that light is reflected at the patterned positions, and light is transmitted at the non-patterned positions, without affecting the display of the information printed on the printed coating layer subsequently. Specifically, the thickness of the reflection enhancement medium layer is 250-350 angstroms.

[0060] In the present embodiment, in step S9, the digital printing suitable agent includes the following components:

[0061] Water-based acrylic resin 68wt%

[0062] Metallurgical silicon dioxide 24.5wt% (particle size 3-10 nanometers)

[0063] Antioxidant (such as butyl hydroxy benzoate) 2wt%

[0064] Color powder fixing agent (such as titanium dioxide or silicon dioxide) 4wt%

[0065] Viscosity regulator (such as polyvinyl alcohol) 1.5wt%.

[0066] Further, in the present embodiment, in step S9, the digital printing suitable agent is heated to 140-150°C, and is coated on the bottom surface of the PET supporting layer 2 by roll coating to form a film, i.e., to form the printed coating layer 1.

[0067] In the present embodiment, the PET supporting layer 2 is a PET film with a thickness of 85-100μm.

[0068] It should be noted that the printed coating layer 1 obtained in the present embodiment has a toner adhesion of 100% for the printer, the image is clear, and the color reproduction degree is high, which meets the requirements of personalized data printing.

[0069] The aqueous acrylic resin is made of 50wt% of methacrylic resin, 30wt% of acrylic monomer, 1wt% of water-soluble emulsifier, 18.5wt% of water and 0.5wt% of water-soluble initiator. The water-soluble emulsifier is used to reduce the surface tension between monomers, the appropriate amount of water is used to disperse into emulsion, and the water-soluble initiator is used to decompose free radicals to further initiate the copolymerization of monomers.

[0070] In this embodiment, in step S9, the structural adhesive is made of 50wt% of epoxy resin, 31wt% of polyether polyol, 5wt% of polyisocyanate, and 14wt% of total amount of catalyst, solvent and diluent.

[0071] After the personalized anti-counterfeiting printing film is prepared, in specific application, the personal information of the certificate holder is mirror printed on the printing coating surface of the personalized anti-counterfeiting printing film through a digital printer, the printed surface is laminated with a card base material such as PVC and PETG to form a card, and finally the BOPET bearing layer and the anti-static layer on the surface are torn off to complete the production of the certificate.

[0072] For those skilled in the art, various corresponding changes and modifications can be given according to the above technical solutions and concepts, and all these changes and modifications should be included in the protection scope of the claims of the present application.

Claims

1. A method for preparing a personalized anti-counterfeiting printing film, characterized in that, The specific process is as follows: S1. Prepare a mixed solvent with antistatic properties; S2. Apply the mixed solvent obtained in step S1 to the top surface of the BOPET carrier layer by spraying, roller coating or casting to form an antistatic layer. S3. Heat the cellulose diacetate solution and apply the heated cellulose diacetate solution to the bottom surface of the BOPET carrier layer to form a release structure layer: Dissolve cellulose diacetate in ethyl acetate solvent, then introduce it into the material tank of the coating equipment. Heat the cellulose diacetate solution in the material tank to 50℃-70℃, and then coat it onto the bottom surface of the BOPET carrier layer to form a release structure layer with a coating thickness of 7μm-10μm. S4. Pre-design a holographic pattern, and use photolithography to fabricate a nickel plate with interference and diffraction effects to obtain a nickel plate with a holographic pattern: Computer-aided design software is used to create the required holographic pattern according to the needs and design requirements. Then, the designed holographic pattern is etched onto the photolithography film of the photolithography template using photolithography technology. The photolithography template is then immersed in a nickel salt solution, and nickel is deposited on the surface of the photolithography template through an electrochemical reaction. After removing the photolithography film, a template containing only nickel, i.e., a nickel plate, is obtained. A laser beam is used to irradiate the nickel plate to excite the optical effects on the nickel surface. The interaction between the laser beam and the nickel surface produces interference and diffraction effects, ultimately resulting in a nickel plate with a holographic pattern. S5. Apply acrylic resin to the bottom surface of the release structure layer to form an acrylic resin coating. S6. The holographic pattern of the nickel plate is transferred to the bottom surface of the acrylic resin coating by hot pressing to obtain the optical structure layer; S7. Perform corona treatment on the bottom surface of the optical structure layer; S8. A reflection-enhancing medium layer is formed on the bottom surface of the optical structure layer after corona treatment using vacuum coating technology. S9. Apply structural adhesive to the top surface of the PET carrier layer, and then laminate the top surface of the PET carrier layer to the bottom surface of the reflective enhancement medium layer; in addition, prepare a digital printing agent, apply the digital printing agent to the bottom surface of the PET carrier layer to form a printing coating, and obtain the finished personalized anti-counterfeiting printing film; the structural adhesive is made of the following components: 50wt% epoxy resin, 31wt% polyether polyol, 5wt% polyisocyanate, and catalyst, solvent and diluent, the total amount of catalyst, solvent and diluent is 14wt%.

2. The preparation method according to claim 1, characterized in that, In step S1, the antistatic solvent is made from the following components: 10 wt% antistatic agent, 20 wt% antistatic polymeric resin, 5 wt% surfactant, 3 wt% ion exchanger, 60 wt% cosolvent, and 2 wt% metal powder.

3. The preparation method according to claim 1, characterized in that, The specific process of step S5 is as follows: dissolve acrylic resin in methyl ethyl ketone solvent at a mass ratio of 1:1.7, heat to 120℃-200℃, and then coat it onto the bottom surface of the release structure layer to form an acrylic resin coating with a thickness of 1μm-2μm.

4. The preparation method according to claim 1, characterized in that, The specific process of step S6 is as follows: Place the prepared nickel plate with holographic pattern on the bottom surface of the acrylic resin coating obtained by heating and coating, ensuring that the nickel plate is in close contact with the surface of the acrylic resin coating; apply an appropriate amount of pressure to transfer the holographic pattern on the nickel plate to the bottom surface of the acrylic resin coating; then use ultraviolet irradiation or heat curing to cure the acrylic resin coating; thereby, a micro-nano optical structure pattern is formed on the bottom surface of the acrylic resin coating, constituting an optical structure layer.

5. The preparation method according to claim 1, characterized in that, In step S8, the reflection enhancement medium includes any one or more of Al, Zn, Ag, Au, and Cr, or oxides or sulfides of one or more of Al, Zn, Ag, Au, and Cr. The reflection enhancement medium is loaded onto the bottom surface of the optical structure layer using vacuum coating technology, forming metal dots at the pattern positions and controlling the density so that light is reflected at the pattern positions and transmitted at the non-pattern positions, without affecting the display of information printed on the printing coating.

6. The preparation method according to claim 1, characterized in that, In step S9, the digital printing agent includes the following components: 68 wt% waterborne acrylic resin, 24.5 wt% fumed silica, 2 wt% antioxidant, 4 wt% toner fixative, and 1.5 wt% viscosity modifier.

7. A personalized anti-counterfeiting printing film prepared by the method according to any one of claims 1-6.

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