Composite holographic anti-counterfeiting material resistant to hot air uncovering and preparation method of composite holographic anti-counterfeiting material

Abstract

The invention belongs to the technical field of packaging materials, and particularly relates to a composite holographic anti-counterfeiting material resistant to hot air uncovering and a preparation method thereof.The composite holographic anti-counterfeiting material is sequentially provided with a thermosensitive layer, a connecting coating, a BOPP core layer, a transfer glue layer, an evaporation layer, a holographic image layer and a transfer imaging coating from bottom to top, the evaporation layer is a vacuum aluminum-plated layer, the connecting coating is fully coated, and the transfer imaging coating is coated on the surface of the vacuum aluminum-plated layer. The bonding layer is used for connecting the thermosensitive layer and the BOPP core layer; the preparation method comprises the following steps of (1) fully coating the PET base film layer with the transfer imaging coating, (2) carrying out mold pressing on the coated base material in the step (1) to form a holographic image, (3) carrying out compact aluminum plating treatment on the mold pressing surface in the step (2), (4) carrying out dry compounding, (5) carrying out stripping, and (6) carrying out dry compounding.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging materials, and in particular relates to a composite holographic anti-counterfeiting material suitable for anti-counterfeiting packaging and safety sealing scenarios and resistant to hot wind lifting, and a preparation method thereof. Background Art

[0002] The sealing and anti-tear functions of traditional self-adhesive labels, sealing tapes and other products mainly rely on the viscosity of the adhesive. These products can be easily softened by hot air (60-80℃) to achieve lossless removal, resulting in the risk of malicious unsealing of the packaging.

[0003] To solve this problem, those skilled in the art have come up with the idea of ​​using conventional heat shrinkable films (PE, POF, etc.) as the base film for labels and tapes, leveraging their temperature sensitivity to achieve an anti-tampering function. However, conventional heat shrinkable films also have the following drawbacks when applied to labels and tapes: 1) When in use, the label or tape cannot form a coordinated anti-tear structure with the adhesive material; when the label or tape is attached to the adhesive material, due to the inherent defect of the pressure-sensitive adhesive layer that softens and loses adhesion when heated, it cannot achieve the anti-counterfeiting and anti-tear function, resulting in the label or tape being opened maliciously without damage; 2) The heat resistance property causes serious deformation during holographic processing, making it impossible to achieve holographic processing, resulting in poor product appearance. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite holographic anti-counterfeiting material that is resistant to hot wind and a preparation method thereof. The composite holographic anti-counterfeiting material is provided with a surface material that is extremely sensitive to heat sources. When blown by a heat sealing gun or a similar heat source, the surface material will be significantly deformed. When applied to tape and label products, the composite holographic anti-counterfeiting material solves the defect that the tape and label are not resistant to hot wind and can be easily removed without damage by malicious means.

[0005] The present invention is achieved through the following technical solutions: That is, a composite holographic anti-counterfeiting material that is resistant to hot wind, characterized in that a heat-sensitive layer, a connecting coating, a BOPP core layer, a transfer glue layer, a vapor-deposited layer, a holographic image layer, and a transfer imaging coating are arranged in sequence from bottom to top. The vapor-deposited layer is a vacuum aluminum-plated layer, and the connecting coating is fully coated to connect the heat-sensitive layer and the BOPP core layer.

[0006] The BOPP core layer of the present invention is used to realize the load-bearing property of the material and can achieve tension matching with the heat-sensitive layer.

[0007] When the temperature is below 50°C, the anti-transfer performance of the composite holographic anti-counterfeiting material of the present invention mainly depends on the performance of the adhesive used in subsequent processing. When the temperature exceeds 50°C, the viscosity of the adhesive decreases, and the heat-sensitive layer can shrink rapidly to prevent the material from being peeled off without damage.

[0008] Furthermore, the raw materials and their mass percentages of the heat-sensitive layer of the present invention are: Bio-based PE 45-55%; Nanocellulose aerogel 4-6%; Photothermal conversion agent 1.5-2.5%; terpolymer polypropylene 9-11%; Graphene quantum dots 7.5-8.5%; Self-healing elastomer 10-20%; Ionic liquid modified EVA 8-12%.

[0009] The PE of the present invention is a bio-based PE material made from sugarcane ethylene produced by Anhui Fengyuan Group, with a surface energy of 28-30 dyn / cm².

[0010] The nanocellulose aerogel of this invention comes from Shenzhen Zhongning Technology, forming a porous skeleton (porosity 92%) and improving puncture resistance by 40%.

[0011] The photothermal conversion agent of the present invention is made of rare earth-doped TiO2, and the brand can be selected from Northern Rare Earth or Shenghe Resources. The infrared absorption rate at 50°C is greater than 90%, which triggers the self-heating and contraction of the thermal sensitive layer.

[0012] The terpolymer polypropylene (ter-PP) + OPP component of the present invention imparts rapid shrinkage to the heat-sensitive layer. Preferably, a low crystallinity grade (such as LyondellBasell RF3867) is used to reduce the shrinkage temperature of the heat-sensitive layer to the range of 50-80°C.

[0013] The graphene quantum dots of the present invention serve as an interfacial compatibilizer. The graphene quantum dot solution (Cat. No. 55147014) from Shanghai Zhenzhun Biotechnology Co., Ltd. can be used to simultaneously enhance thermal conductivity (+200%) and oxygen barrier properties (OTR < 5cc / m²·day).

[0014] The self-repairing elastomer of the present invention is polyurethane-urea, containing hydrogen bond tetramer, and can adopt Shandong Deshili New Material Kelanling LL-81, and the 24-hour self-repair rate of pinhole damage is greater than 85%.

[0015] The ionic liquid modified EVA of Sailboat Petrochemical of the present invention is plasticized with [EMIM][TFSI] ionic liquid, remains flexible at -40°C, and has a heat sealing strength increased to 35N / 15mm.

[0016] The heat-sensitive layer of the present invention is manufactured by a co-extrusion casting-double-bubble stretching process, and the specific steps are as follows: First bubble: melt co-extrusion at 190-200℃, water cooling to 30℃ to form an amorphous thick film; Second bubble: biaxially stretched in a 90°C hot water bath (3.5 times in the longitudinal direction and 3.0 times in the transverse direction) to lock the molecular orientation structure; Electron beam irradiation cross-linking: Using a 10 Mrad dose of irradiation to build a moderately cross-linked network, improving shrinkage resilience (shrinkage rate increased by 20–30%); Post-processing control: The heat setting temperature is controlled at 60–70°C to avoid pre-shrinkage; the winding tension is ≤5 N / cm to prevent shrinkage failure caused by cold stretching.

[0017] Preferably, the connecting coating is a two-component polyurethane dry composite glue, the model of which can be Laizhou Yuli YL6789. The mass ratio of the main agent to the auxiliary agent is 6:1, ethanol is used as a diluent, and the anilox roller is used for coating. The solid content on the machine is between 18% and 25%, and the wet coating amount on the machine is 5.0-6.0g / square. The coating surface is the corona surface of the BOPP core layer. The glue is sticky after drying, and is laminated with the heat sealing layer after leaving the oven. No aging is required after the lamination is completed.

[0018] Preferably, the BOPP core layer is a biaxially oriented polyacrylic acid film with double-sided corona treatment, a surface corona value ≥38 dyn, no heat sealing layer, and a thickness of 18-33 μm. It is an important bearing layer of this material.

[0019] Preferably, the glue of the transfer glue layer is a polyester two-component dry composite glue, preferably Huzhou Europe and America CP series glue, the mass ratio of the main agent to the auxiliary agent is 5:1, ethyl acetate is used as a diluent, anilox roller coating is used, the solid content on the machine is between 16%-20%, the wet coating amount on the machine is 6.0-7.0g / square, the coating surface is the aluminum-plated layer of the PET transfer film, and the outer corona surface of the composite BOPP core layer is completed. The glue has viscosity after drying, and after leaving the oven, it is bonded with the outer corona surface layer of the BOPP core layer to complete the composite. After the composite is completed, it needs to be matured at 50°C for 24 hours.

[0020] Preferably, the thickness of the aluminum plating layer is 300-450 angstroms.

[0021] The aluminum plating layer is made by vacuum evaporation. The function of the aluminum plating layer is to make the entire anti-counterfeiting material present a metal-like luster, making the appearance more colorful and effectively supporting the appearance.

[0022] Preferably, the transfer imaging coating of the present invention is an acrylic mold transfer coating currently used in manufacturing, with a solid content of 18% (preferably Guangdong Banggu RTH series coating). The main resin adopts CAB-381 acrylic series resin, which has good fluidity, mold imaging performance and edge cutting properties. It adopts the method of anilox roller coating and can be well spread on the non-corona surface of PET. It is the carrier layer of the holographic molded image and belongs to the key layer structure.

[0023] Furthermore, the vapor-deposited layer of the present invention is a full-plate vapor-deposited layer or a partial vapor-deposited layer.

[0024] A method for preparing a composite holographic anti-counterfeiting material resistant to hot wind removal is characterized by the following steps: 1) Apply transfer imaging coating to the PET base film layer, 150 mesh ceramic anilox roller, wet coating weight 9.0g / m 2 , the solid content on the machine is 18%, the coating temperature is 90-120-145-150-90℃, the speed is 80m / min, the film surface temperature is 99℃, and the 3M tape is used to check the peeling at the winding position to ensure that it is well peeled and the winding is neat; 2) Using a embossing machine, emboss the holographic image onto the transfer coating using a nickel plate with a holographic effect on the substrate coated in step 1) at a temperature of 170-180°C and a roller pressure of 25-35 kg. Step 2) The ability to create a holographic effect on a transparent substrate is crucial for ensuring product appearance. 3) The molded surface in step 2) is treated with a dense aluminum coating. The high-purity aluminum wire is vaporized in a vacuum state of 10-3-10-4 Pa and heated to 1700℃. After cooling, it adheres to the film corona surface to form an aluminum coating layer. The function of the aluminum coating is to protect the embossed holographic pattern and give the material a bright metallic luster; 4) Dry lamination: Place the inner corona surface of the BOPP core layer on the auxiliary unwinding stand of the dry laminating machine, and place the PET transfer film processed in step 3) on the main unwinding stand. Use transfer glue to apply glue to the aluminum-plated surface of the PET transfer film. After drying in an oven, laminate it with the inner corona surface of the BOPP core layer. Use ethyl acetate as a diluent when applying the transfer glue. Apply the transfer glue with an anilox roller. The solid content of the machine is between 16% and 20%, and the wet coating amount is 6.0-7.0g / square meter. After lamination, cure at 50℃ for 24 hours. 5) Peeling process: Peel off the PET transfer film on the surface of the film treated in step 4). During the peeling process, all the information on the PET transfer film will be transferred to the BOPP core layer. The peeling speed is 100m / min. During the process, ensure that the transfer is complete and the winding is neat. 6) Dry lamination: Place the heat-sensitive layer on the auxiliary unwinding stand of the dry laminating machine, place the BOPP holographic film processed in step 5 on the main unwinding stand, and use the connecting coating glue to dry-laminate the heat-sensitive layer and the BOPP holographic film. Use ethanol as a diluent when applying the connecting coating glue. Apply the anilox roller with a solid content of 18%-25% and a wet coating amount of 5.0-6.0g / square meter. The coated surface is the outer corona surface of the BOPP core layer. Preferably, the PET transfer film of the present invention is a double-sided non-corona PET polyester film with a thickness of 15-30 μm, and a tensile strength MD ≥ 210 MPa and TD ≥ 220 MPa.

[0025] Furthermore, during the production of the present invention, a partial aluminum plating effect (hollow window effect) can also be achieved: after step 2) is completed and before step 3) begins, a water-washable ink is partially printed on the molded surface after step 2) using a gravure printing press. The water-washable ink has a solid content of 12% on the machine and a viscosity of 13 seconds after coating with a 4# cup. The printing plate roller uses a 175-mesh electric engraving roller. In step 4), after aluminum plating, aluminum is washed and removed by water. The film is then put into an oven, dried and rolled up. The oven temperature is set at 70-80-80-80-70°C, and the aluminum washing machine runs at a speed of 20m / min.

[0026] The substrate of the present invention is coated with UV silicone oil on the heat-sensitive surface and water-based acrylic pressure-sensitive glue on the non-heat-sensitive surface using UV silicone-coating and glue-coating equipment, and then rolled and cut to obtain a tape product.

[0027] The substrate of the present invention is used as the surface material of the self-adhesive label. A solvent-based acrylic coating machine is used to apply solvent-based acrylic pressure-sensitive adhesive on silicone oil paper. After drying in an oven, the adhesive is laminated to the non-heat-sensitive surface of the substrate. Finally, die-cutting is performed according to preset requirements to obtain a label product.

[0028] The present invention has the advantages of a good product appearance and excellent anti-counterfeiting performance. While maintaining the material's holographic anti-counterfeiting effect, the present invention also adds a heat-sensitive layer to the BOPP core layer, which is extremely sensitive to heat sources. When applied to tapes and labels, this layer prevents the adhesive layer from being debonded by high temperatures and can be removed without damage. This provides the end product with a safer anti-tear feature, significantly improving the end product's anti-counterfeiting performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the layer structure of Example 1 of the present invention.

[0030] Figure 2 This is a schematic diagram of the layer structure of Example 2 of the present invention.

[0031] As shown in the figure: 1. Transfer imaging coating; 2. Holographic image layer; 3. Evaporated layer; 4. Transfer glue layer; 5. BOPP core layer; 6. Connecting coating; 7. Heat-sensitive layer; 8. Partially evaporated layer. DETAILED DESCRIPTION Example 1

[0032] like Figure 1As shown: the hot wind resistant composite holographic anti-counterfeiting material of this embodiment comprises, from bottom to top, a heat-sensitive layer 7, a connecting coating 6, a BOPP core layer 5, a transfer glue layer 4, a vapor-deposited layer 3, a holographic image layer 2 and a transfer imaging coating 1.

[0033] The transfer imaging coating 1 is an acrylic mold transfer coating currently used in manufacturing, with a solid content of 18% (preferably Guangdong Banggu RTH series coating). The main resin adopts CAB-381 acrylic series resin, which has good fluidity, mold imaging performance and cutting edge properties. It adopts the anilox roller coating method and can be well spread on the non-corona surface of PET. It is the carrier layer of the holographic molded image and belongs to the key layer structure.

[0034] The holographic image layer 2 uses a holographic plate commonly used in the anti-counterfeiting industry, such as a D38 blue-light plain surface, 400dpi without white bars and horizontal light columns.

[0035] The evaporated layer 3 is a full-plate evaporated layer, the evaporated medium is pure aluminum, and the thickness of the aluminum layer is 300 angstroms.

[0036] The transfer glue layer 4 is a polyester two-component dry composite glue, and the recommended model is Huzhou Europe and America CP series glue.

[0037] The BOPP core layer 5 is a biaxially oriented polyacrylic acid film with double-sided corona treatment, a surface corona value ≥38dyn, no heat sealing layer, and a thickness of 18μm. It is an important bearing layer of this material. The recommended manufacturer is Wenzhou Jintian.

[0038] The connecting coating 6 is a polyurethane two-component dry composite glue, which is Laizhou Yuli's YL-6789 model. The mass ratio of the main agent to the auxiliary agent is 6:1. Ethanol is used as a diluent, and it is coated with an anilox roller. The solid content on the machine is between 18% and 25%, and the wet coating amount on the machine is 5.0-6.0g / square. The coating surface is the corona surface of the BOPP core layer. The glue is sticky after drying. After leaving the oven, it is bonded with the heat sealing layer to complete the composite. No aging is required after the composite is completed.

[0039] The formula of the heat-sensitive layer 7 is as follows: Bio-based PE (made from sugarcane ethylene) 55%, nanocellulose aerogel 5%, photothermal conversion agent (rare earth-doped TiO2) 1.5%, terpolymer polypropylene (ter-PP) 9%, graphene quantum dots 7.5%, self-healing elastomer (polyurethane-urea) 10%, ionic liquid modified EVA 12%.

[0040] The heat-sensitive layer 7 is manufactured by a co-extrusion casting-double bubble stretching process, and the specific steps are as follows: First bubble: melt co-extrusion at 190-200℃, water cooling to 30℃ to form an amorphous thick film; Second bubble: biaxially stretched in a 90°C hot water bath (3.5 times in the longitudinal direction and 3.0 times in the transverse direction) to lock the molecular orientation structure; Electron beam irradiation cross-linking: Using a 10 Mrad dose of irradiation to build a moderately cross-linked network, improving shrinkage resilience (shrinkage rate increased by 20–30%); Post-processing control: The heat setting temperature is controlled at 60–70°C to avoid pre-shrinkage; the winding tension is ≤5 N / cm to prevent shrinkage failure caused by cold stretching.

[0041] The preparation method of the hot wind-resistant composite holographic anti-counterfeiting material of this embodiment comprises the following steps: Step 1: Fully apply transfer imaging coating 1 on the PET base film layer, 150 mesh ceramic anilox roller, wet coating amount 9.0g / m 2 , the solid content on the machine is 18%, the coating temperature is 90-120-145-150-90℃, the speed is 80m / min, the film surface temperature is 99℃, and the 3M tape is used to check the peeling at the winding position to ensure that it is well peeled and the winding is neat; The PET base film layer is a double-sided non-corona PET polyester film with a thickness of 15-30um, a tensile strength MD ≥ 210MPa, and a TD ≥ 220MPa. The recommended manufacturers are Foshan DuPont HP or Rizhao Fenghua FHP302.

[0042] Step 2: Use a embossing machine to emboss the holographic image onto the transfer imaging coating 1 using a nickel plate with a holographic effect on the substrate coated in step 1 under high temperature and high pressure. The embossing temperature is 170-180°C and the roller pressure is 25-35kg.

[0043] Step 2 can produce a holographic effect on a transparent substrate, which is an important guarantee for the product appearance; Step 3: Apply a dense aluminum coating to the molded surface of step 2. Vapor deposition is performed in a vacuum aluminum coating machine. High-purity aluminum wire is heated to about 1700°C under a vacuum state of 10-3-10-4 Pa to vaporize. After cooling, it adheres to the film corona surface to form an aluminum coating. The aluminum coating protects the molded holographic pattern and gives the material a bright metallic luster. Step 4, dry lamination, place the inner corona surface of the BOPP core layer on the auxiliary unwinding seat of the dry laminating machine, place the PET transfer film processed in step 3 on the main unwinding seat, use transfer glue to apply glue on the aluminized surface of the PET transfer film, put it into the oven for drying and then compound it with the inner corona surface of the BOPP core layer. The transfer glue is a polyester two-component dry composite glue, the mass ratio of the main agent to the auxiliary agent is 5:1, ethyl acetate is used as a diluent, anilox roller coating, the solid content on the machine is between 16%-20%, the wet coating amount on the machine is 6.0-7.0g / square, the oven temperature is: 70-80-80-70℃, and after the composite is completed, it needs to be aged at 50℃ for 24 hours.

[0044] Step 5, peeling process, peel off the PET transfer film on the surface of the film processed in step 4. During the peeling process, all the information on the PET transfer film will be transferred to the BOPP core layer. The peeling speed is 100m / min. During the process, ensure that the transfer is complete and the winding is neat.

[0045] Step 6, dry lamination, place the heat-sensitive layer 8 on the auxiliary unwinding seat of the dry laminating machine, place the BOPP holographic film processed in step 5 on the main unwinding seat, use the connecting coating glue to dry-laminate the heat-sensitive layer 8 and the BOPP holographic film, the mass ratio of the main agent to the auxiliary agent when applying the connecting coating glue is 6:1, ethanol is used as a diluent, and the anilox roller is used for coating. The solid content on the machine is between 18% and 25%, and the wet coating amount on the machine is 5.0-6.0g / square. The coating surface is the corona surface of the BOPP core layer. The glue has viscosity after drying. After leaving the oven, it is laminated with the heat-sensitive layer 7 to complete the lamination. No aging is required after the lamination is completed.

[0046] The anti-counterfeiting material prepared in this embodiment maintains a normal appearance in an environment below 55°C. When the ambient temperature is higher than 55°C or when blown by a hot air gun, the heat-sensitive layer 8 on the surface will undergo obvious deformation. Example 2

[0047] The layer structure of the hot wind resistant composite holographic anti-counterfeiting material of this embodiment is the same as that of Example 1.

[0048] The vapor-deposited layer 3 of this embodiment is a full-plate vapor-deposited layer, the vapor-deposited medium is pure aluminum, and the thickness of the aluminum layer is 350 angstroms.

[0049] The BOPP core layer 5 of this embodiment is a biaxially oriented polyacrylic acid film with double-sided corona treatment, a surface corona value of ≥38 dyn, no heat sealing layer, and a thickness of 25 μm. The recommended manufacturer is Wenzhou Jintian.

[0050] The formula of the heat-sensitive layer 7 is as follows: Bio-based PE (made from sugarcane ethylene) 52%, nanocellulose aerogel 4%, photothermal conversion agent (rare earth-doped TiO2) 2.5%, terpolymer polypropylene (ter-PP) 11%, graphene quantum dots 8.5%, self-healing elastomer (polyurethane-urea) 12%, and ionic liquid modified EVA 10%.

[0051] The method for preparing the heat-sensitive layer in this embodiment is the same as that in Example 1.

[0052] The requirements for other layers in this embodiment are the same as those in embodiment 1.

[0053] The preparation method of the hot wind resistant composite holographic anti-counterfeiting material of this embodiment is the same as that of Example 2.

[0054] Compared with Example 1, this embodiment further reduces the temperature resistance of the entire heat-sensitive layer 7 by increasing the content of TER-PP, causing it to shrink in an environment above 45°C. At the same time, the content of self-healing elastomer is increased to increase the stability of the material finishing, ensuring that the material deformation is controllable under the critical temperature condition of 45°C. Example 3

[0055] like Figure 2 As shown in the figure: the composite holographic anti-counterfeiting material that is resistant to hot wind in this embodiment comprises, from bottom to top, a heat-sensitive layer 7, a connecting coating 6, a BOPP core layer 5, a transfer glue layer 4, a partial vapor-deposited layer 8, a holographic image layer 2 and a transfer imaging coating 1.

[0056] In the partial vapor-deposited layer 8 of this embodiment, the vapor-deposited medium is pure aluminum, and the thickness of the aluminum layer is 450 angstroms.

[0057] The BOPP core layer 5 of this embodiment is a biaxially oriented polyacrylic acid film with double-sided corona treatment, a surface corona value of ≥38 dyn, no heat sealing layer, and a thickness of 33 μm. The recommended manufacturer is Wenzhou Jintian.

[0058] The formula of the heat-sensitive layer 7 is as follows: Bio-based PE (made from sugarcane ethylene) 45%, nanocellulose aerogel 6%, photothermal conversion agent (rare earth-doped TiO2) 2%, terpolymer polypropylene (ter-PP) 10.5%, graphene quantum dots 8%, self-healing elastomer (polyurethane-urea) 20%, ionic liquid modified EVA 8.5%.

[0059] The method for preparing the heat-sensitive layer of this embodiment is the same as that of the embodiment.

[0060] The requirements for other layers in this embodiment are the same as those in embodiment 1.

[0061] The preparation method of the hot wind-resistant composite holographic anti-counterfeiting material of this embodiment comprises the following steps: Step 1: Fully apply transfer imaging coating 1 on the PET base film layer, 150 mesh ceramic anilox roller, wet coating amount 9.0g / m 2 The solid content on the machine is 18%, the coating temperature is 90-120-145-150-90℃, the speed is 80m / min, the film surface temperature is 99℃, and the 3M tape is used to check the peeling at the winding position to ensure good winding and neatness.

[0062] In step 2, the holographic image is embossed onto the transfer coating using a holographic nickel plate, after high temperature and pressure, using a embossing press. The embossing temperature is 170-180°C, and the roller pressure is 25-35kg. Step 2 creates a holographic effect on a transparent substrate, a crucial factor in ensuring the product's appearance.

[0063] Step 3, printing water-washable ink, using a gravure printing machine, locally printing water-washable ink on the molded surface after step 2 molding, the water-washable ink has a machine solid content of 12%, a 4# cup viscosity of 13 seconds, and a 175-mesh electric engraving roller. Calcium carbonate type water-based washable ink is selected. The washable ink has good adhesion and printing adaptability to PET holographic transparent film and can present fine graphic effects. The washable ink uses Shantou Fenghua's washable white ink.

[0064] Step 4: Make a dense aluminum coating on the molded surface of step 2, and perform vapor deposition in a vacuum aluminum coating machine. -3 -10 -4 Pa in a vacuum state, heated to about 1700 ° C to vaporize, and then cooled to adhere to the film corona surface to form an aluminum coating; the aluminum coating protects the molded holographic pattern and gives the material a bright metallic luster.

[0065] Step 5: Water washing and de-aluminization. In a water washing machine filled with water, use a rotating brush to sweep away the aluminum layer where the ink is printed and dissolve it in the water pool, creating a contrast with the aluminum area. The film is then put into an oven, dried, and wound up. The oven temperature is set at 70-80-80-80-70°C, and the aluminum washing machine runs at 20m / min.

[0066] After the entire plate is aluminized and passes through a water washing machine, the aluminum layer in the area where the water-washable ink is printed can be easily peeled off, forming a partial vapor-deposited layer 8 (positioned hollowing after the entire plate is aluminized), creating a more differentiated appearance effect for the anti-counterfeiting material.

[0067] Step 6, dry lamination, place the inner corona surface of the BOPP core layer on the auxiliary unwinding seat of the dry laminating machine, place the PET transfer film processed in step 3 on the main unwinding seat, use transfer glue to apply glue on the aluminized surface of the PET transfer film, put it into the oven for drying and then compound it with the inner corona surface of the BOPP core layer. The transfer glue is a polyester two-component dry composite glue, the mass ratio of the main agent to the auxiliary agent is 5:1, ethyl acetate is used as a diluent, anilox roller coating, the solid content on the machine is between 16%-20%, the wet coating amount on the machine is 6.0-7.0g / square, the oven temperature is: 70-80-80-70℃, and after the composite is completed, it needs to be aged at 50℃ for 24 hours.

[0068] Step 7, peeling process, peel off the PET transfer film on the surface of the film treated in step 4. During the peeling process, all the information on the PET transfer film will be transferred to the BOPP core layer. The peeling speed is 100m / min. During the process, ensure that the transfer is complete and the winding is neat.

[0069] Step 8, dry lamination, place the heat-sensitive layer 7 on the auxiliary unwinding seat of the dry laminating machine, place the BOPP holographic film processed in step 5 on the main unwinding seat, use the connecting coating glue to dry-laminate the heat-sensitive layer 7 and the BOPP holographic film, the mass ratio of the main agent to the auxiliary agent when applying the connecting coating glue is 6:1, ethanol is used as a diluent, and the anilox roller is used for coating. The solid content on the machine is between 18% and 25%, and the wet coating amount on the machine is 5.0-6.0g / square. The coating surface is the corona surface of the BOPP core layer. The glue has viscosity after drying. After leaving the oven, it is laminated with the heat-sensitive layer 8 to complete the lamination. No aging is required after the lamination is completed.

[0070] The composite holographic anti-counterfeiting material resistant to hot wind peeling prepared in this embodiment has an obvious window anti-counterfeiting feature in appearance compared with Example 1, and maintains a normal appearance effect in an environment below 55°C. When the ambient temperature is higher than 55°C or when blown by a hot air gun, the heat seal layer on the surface will undergo obvious deformation.

Claims

1. A composite holographic anti-counterfeiting material resistant to hot wind, characterized in that From bottom to top, a heat-sensitive layer, a connecting coating, a BOPP core layer, a transfer glue layer, a vapor-deposited layer, a holographic image layer, and a transfer imaging coating are arranged in sequence. The vapor-deposited layer is a vacuum aluminum-plated layer, and the connecting coating is fully coated to connect the heat-sensitive layer and the BOPP core layer.

2. The composite holographic anti-counterfeiting material resistant to hot wind according to claim 1, characterized in that The raw materials and their mass percentages of the thermal sensitive layer are: Bio-based PE 45-55%; Nanocellulose aerogel 4-6%; Photothermal conversion agent 1.5-2.5%; terpolymer polypropylene 9-11%; Graphene quantum dots 7.5-8.5%; Self-healing elastomer 10-20%; Ionic liquid modified EVA 8-12%; The photothermal conversion agent is made of rare earth-doped TiO2; The self-healing elastomer is polyurethane-urea; The ionic liquid modified EVA is [EMIM][TFSI] ionic liquid modified EVA.

3. The composite holographic anti-counterfeiting material resistant to hot wind according to claim 1, characterized in that The connecting coating is a polyurethane two-component dry composite glue.

4. The composite holographic anti-counterfeiting material resistant to hot wind according to claim 1, characterized in that The BOPP core layer is a biaxially oriented polyacrylic acid film with double-sided corona treatment and a surface corona value of ≥38dyn.

5. The composite holographic anti-counterfeiting material resistant to hot wind according to claim 1, characterized in that The transfer coating is an acrylic mold transfer coating with a solid content of 18%.

6. The composite holographic anti-counterfeiting material resistant to hot wind according to claim 1, characterized in that The vapor-deposited layer is a full-plate vapor-deposited layer or a partial vapor-deposited layer.

7. A method for preparing a composite holographic anti-counterfeiting material resistant to hot wind exposure according to claim 1, characterized in that Here are the steps: 1) Apply transfer imaging coating to the PET base film layer, 150 mesh ceramic anilox roller, wet coating weight 9.0g / m 2 , the solid content on the machine is 18%, the coating temperature is 90-120-145-150-90℃, the speed is 80m / min, and the film surface temperature is 99℃; 2) Using a embossing machine, emboss the holographic image onto the transfer coating using a nickel plate with a holographic effect on the substrate coated in step 1) at a temperature of 170-180°C and a roller pressure of 25-35 kg. 3) The molded surface in step 2) is treated with a dense aluminum coating. The high-purity aluminum wire is vaporized in a vacuum state of 10-3-10-4 Pa and heated to 1700℃. After cooling, it adheres to the film corona surface to form an aluminum coating layer. 4) Dry lamination: Place the inner corona surface of the BOPP core layer on the auxiliary unwinding stand of the dry laminating machine, and place the PET transfer film processed in step 3) on the main unwinding stand. Use transfer glue to apply glue to the aluminum-plated surface of the PET transfer film. After drying in an oven, laminate it with the inner corona surface of the BOPP core layer. Use ethyl acetate as a diluent when applying the transfer glue. Apply the transfer glue with an anilox roller. The solid content of the machine is between 16% and 20%, and the wet coating amount is 6.0-7.0g / square meter. After lamination, cure at 50℃ for 24 hours. 5) Peeling process: peel off the PET transfer film on the surface of the film treated in step 4) at a peeling speed of 100m / min; 6) Dry lamination: Place the heat-sensitive layer on the auxiliary unwinding stand of the dry laminating machine, place the BOPP holographic film processed in step 5 on the main unwinding stand, use the connecting coating glue to dry-laminate the heat-sensitive layer and the BOPP holographic film, use ethanol as a diluent when applying the connecting coating glue, apply it with an anilox roller, the solid content on the machine is between 18% and 25%, the wet coating amount on the machine is 5.0-6.0g / square, and the coating surface is the outer corona surface of the BOPP core layer.

8. The method for preparing the hot wind-resistant composite holographic anti-counterfeiting material according to claim 7, characterized in that In step 1), the PET transfer film is a double-sided non-corona PET polyester film with a thickness of 15-30 μm and a tensile strength MD ≥ 210 MPa and TD ≥ 220 MPa.

9. The method for preparing the hot wind-resistant composite holographic anti-counterfeiting material according to claim 7, characterized in that After step 2) is completed and before step 3) begins, use a gravure printing press to partially print the molded surface after step 2) with a water-washable ink. The solid content of the water-washable ink is 12%, and the viscosity is 13 seconds for a 4# cup. The printing roller uses a 175-mesh electric engraving roller. In step 4), after aluminum plating, aluminum is removed by water washing. The film is then put into an oven, dried, and rolled up. The oven temperature is set at 70-80-80-80-70°C, and the aluminum washing machine runs at a speed of 20m / min.

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