A peelable, destructible bopp holographic peel material and method of making same

Abstract

This invention belongs to the field of anti-counterfeiting technology for packaging products, specifically relating to a detachable BOPP holographic peel-off material and its manufacturing method. The holographic peel-off material includes a single-sided heat-sealed BOPP base film layer. The heat-sealed surface of the BOPP base film layer is sequentially arranged from bottom to top as a release layer, an imaging layer, a holographic image layer, and an aluminum-plated layer. The release layer is a two-component adjustable adhesion peel-off coating, which is partially coated on the peel-off area of ​​the BOPP base film layer. The manufacturing steps are as follows: 1) partially coating the release layer; 2) fully coating the imaging layer on the heat-sealed surface; 3) molding the holographic image; 4) dense aluminum plating; 5) slitting and winding. This invention uses BOPP film as the base film, and combines the main agent and auxiliary agents to form a two-component adjustable adhesion peel-off coating. Combined with low-temperature molding coating and aluminum plating process, a detachable BOPP holographic peel-off material is produced, which has stable adhesion, controllable peeling, clear holography, and combines holographic anti-counterfeiting performance with precise peeling performance.

Description

Technical Field

[0001] This invention belongs to the field of anti-counterfeiting technology for packaging products, specifically relating to a BOPP holographic peel-off material that can be peeled off and its manufacturing method. Background Technology

[0002] Holographic peel-off material combines the visual recognition of holographic anti-counterfeiting with the anti-counterfeiting and confidentiality of peel-off destruction, making it one of the core materials in the high-end anti-counterfeiting field. Its core requirements are: the material is stable and adheres to the substrate after molding, and can be controlled to be destroyed when peeled off. At the same time, the holographic pattern is clear, not easy to imitate, and can be adapted to the peel-off area requirements of different scenarios.

[0003] Currently, most existing holographic peel-off anti-counterfeiting materials in the industry are made with PET substrates. For example, the utility model patent technology for a printed holographic peel-off digital anti-counterfeiting label, authorized by the Chinese Patent Office on May 21, 2008, with announcement number CN201061924Y, includes, from top to bottom, a tightly composite printing layer, a carrier PET plastic film, an aluminum-plated holographic layer, a curing layer, an ink layer, an information layer, an adhesive layer, and a silicone paper layer. Due to the inherent rigidity and insufficient flexibility of the PET substrate, the above-mentioned printed holographic peel-off digital anti-counterfeiting label has poor adhesion to the surface of the object being labeled, especially in special applications such as right-angle application and irregular sealing. After labeling, defects such as edge curling and loose adhesion easily occur, making it difficult to meet the requirements of high-end and special sealing applications. Summary of the Invention

[0004] The purpose of this invention is to provide a peelable BOPP holographic peelable material and its manufacturing method. It uses BOPP film as the base film and combines it with a two-component adjustable adhesion peelable coating. The resulting peelable material has stable adhesion, controllable peeling, and clear holography.

[0005] This invention is achieved through the following technical solution: That is, a BOPP holographic peelable material that can be peeled off and destroyed, characterized in that it includes a BOPP base film layer that is heat-sealed on one side, and the heat-sealed surface of the BOPP base film layer is provided with a release layer, an imaging layer, a holographic image layer and an aluminum-plated layer from bottom to top. The release layer is a two-component adjustable adhesion peelable coating, which is partially coated on the peelable area of ​​the BOPP base film layer.

[0006] The BOPP base film layer of this invention is used to achieve the load-bearing capacity of the material. Preferably, the material substrate is a biaxially oriented polyacrylic acid film, which is free of corona discharge on both sides, has a surface corona discharge value ≤30 dyn, is heat-sealed on one side, and has a thickness of 18-33 μm, serving as the load-bearing layer of this material.

[0007] BOPP film possesses characteristics such as flexibility, excellent conformability to curved and right-angle surfaces, and resistance to peeling and delamination, effectively addressing the lamination drawbacks of PET substrates. However, simply replacing existing PET films with BOPP film has two major drawbacks: First, the peeling performance is difficult to control precisely. Either the material is severely damaged when peeling off, making complete separation impossible, or the material is peeled off without damage after bonding, failing to meet the requirements of preventing malicious peeling. Secondly, the holographic layer and the peel-off layer have poor compatibility. When the peel-off coating system commonly used in the market is combined with low-temperature molding coating and aluminum plating layer, problems such as interlayer peeling and visual differences caused by the superposition and brightening of holographic patterns are likely to occur, which affect the anti-counterfeiting effect and appearance of the product.

[0008] This invention uses a two-component adjustable adhesion release coating as a release layer, which solves the two major defects mentioned above. The release layer is applied to the area where the substrate is left after the release.

[0009] The imaging layer of this invention is a holographic molding coating. A low-temperature resistant acrylic molding coating system is preferred, using ethyl acetate as a diluent, applied by anilox roller, with an on-machine solids content between 18% and 20% and a wet coating weight of 8 g / m². 2 The coating surface is the heat-sealing layer. Before applying the coating, the heat-sealing layer is corona treated. After drying, the coating has good bonding strength with the corona-treated BOPP heat-sealing layer and can stably form images at 120°C. It is the key coating for the holographic appearance of this material.

[0010] The aluminum plating layer of this invention has a thickness of 350-500 angstroms and is applied to the entire surface. The aluminum plating layer is produced by vacuum evaporation. The function of the aluminum plating layer is to give the entire anti-counterfeiting material a metallic luster. Combined with the embossed holographic image, the product appearance is more dazzling, and it effectively supports the apparent metallic luster.

[0011] Furthermore, the two-component adjustable adhesion peel-off coating of the present invention comprises a main agent and an auxiliary agent, wherein the mass ratio of the main agent to the auxiliary agent is 100:1-6. The main ingredients and their mass percentages are as follows: Dry alkyd resin 13.5-16.0%; Modified polyethylene resin 10.5-13.0%; Ethyl acetate 28.5-32.0%; Toluene 25.0-27.0%; Xylene 13.0-14.5%; Dispersant 0.9-1.2%; Defoamer 0.4-0.6%; Stabilizer 0.6-0.9%; Wetting agent 0.7%; The raw materials and their mass percentages for the additives are as follows: Olefin resin 42.0-48.0%; Modified phenolic resin 20.0-26.0%; EVA resin 20.0-24.0%; Mixed solvent 6.0-10.0%; Silane coupling agent 1.2%; Antioxidant 0.8%; The mixed solvents include propyl acetate, butyl acetate, and toluene, in a mass ratio of 4:4:2.

[0012] The release layer (two-component adjustable adhesion peel-off coating) of the present invention is a key material for peeling off damage and adopts a two-component system.

[0013] The main agent is a blend of dry alkyd resin and modified polyethylene, which has good film-forming properties, ensuring the integrity of the text after peeling off, and has almost no adhesion to BOPP substrate. It also has good adhesion to commonly used acrylic coatings, making it suitable as a base system for peel-off coatings. The additive uses a compound system of olefin resin, phenolic resin and EVA resin, which has excellent wetting and adhesion enhancement effects on BOPP material. It can be used as a key additive to adjust the adhesion. The amount of additive can be flexibly adjusted according to the needs of different backing areas. The smaller the backing area, the less additive is added and the lower the peeling force value, and vice versa.

[0014] The two-component adjustable adhesion peeling coating of the present invention is used in conjunction with BOPP peeling material to achieve controllable peeling of the peeling material.

[0015] A method for preparing a detachable and destructible BOPP holographic removable material, characterized by the following steps: 1) On the heat-sealed BOPP base film layer, a release layer is partially coated, that is, a release layer is coated on the area where the base is peeled off. The coating is done using a metal electro-engraving roller with an engraving depth of 45μm, V-shaped cells, 140 mesh, a coating temperature of 90-100-110-110-100℃, a machine speed of 80m / min, and a film surface temperature of 71℃. Before winding, a corona treatment is performed on the wire, with single-sided corona treatment. The corona treatment surface is the heat-sealed layer, and the corona power is 1.5KW. 2) On the BOPP base film layer coated in step 1), a full-coverage imaging layer is coated on the heat-sealed surface. The coating is done using an anilox roller, specifically a 180-mesh ceramic anilox roller, with a wet coating amount of 6.5 g / m². 2 The solid content of the coating is 17%, the coating temperature is 80-90-100-100-90℃, the machine speed is 90m / min, and the film surface temperature is 65℃. 3) On the BOPP base film layer coated in step 2), the holographic image is imprinted onto the transfer imaging coating using a nickel plate with a holographic effect, in the same way as PET molding. The imprinting surface is a heat-sealed surface, the molding temperature is 108℃, the roller pressure is 30kg, and the overall production speed is 60m / min. 4) Apply a dense aluminum coating to the molded surface in step 3), and perform vapor deposition in a vacuum aluminum plating machine to deposit the high-purity aluminum wire at 10... -4 Under vacuum conditions, it is heated to 1700℃ to vaporize, and then cooled and adhered to the holographic molding surface to form an aluminum plating layer. 5) Cut and roll up the material processed in step 4) according to the required size.

[0016] Furthermore, the preparation steps of the main agent of the release layer of the present invention are as follows: 1) Pre-mixing of mixed solvents: Weigh ethyl acetate, toluene, and xylene according to the mass percentage, put them into the mixing tank, stir at 300-500 rpm for 5-10 minutes, mix evenly, and obtain the mixed solvent base; 2) Resin dissolution: Under stirring, add dry alkyd resin and modified polyethylene resin in sequence, heat to 40-60℃ (preferably 50-55℃), maintain a speed of 400-600 rpm, stir for 30-60 minutes until the resin is completely dissolved and the system is a homogeneous transparent or slightly yellow liquid. 3) Adding additives: Cool down to below 35℃, then add dispersant, wetting agent, stabilizer and defoamer in sequence, and disperse at 600-800 rpm for 15-25 minutes to ensure that the additives are evenly dispersed in the resin liquid; 4) Take a sample and measure the viscosity (Ford cup 4, 25°C). If the viscosity is too high, add a small amount of mixed solvent to adjust it to 10-25 seconds. Filter through a 200-mesh sieve to remove bubbles, and the main agent coating is obtained. The preparation steps of the release layer additive are as follows: 1) Solvent preparation: Weigh out the olefin resin, modified phenolic resin and EVA resin by mass percentage, add the mixed solvent, and stir in a disperser at 600-1000 rpm for 20-40 minutes to fully dissolve or swell the resin and form a uniform resin solution. 2) Grinding and dispersion: Transfer the above resin solution to a sand mill or basket mill, add silane coupling agent and antioxidant, grind and disperse at 1500-2500 rpm for 30-60 minutes, control the fineness ≤30 μm (detected by scraper fineness gauge) to obtain the base material; 3) Adjusting viscosity: Transfer the ground base material to the mixing tank, and add a small amount of mixed solvent as needed to adjust the application viscosity to 25-35 seconds (25℃) for the Forecast cup 4.

[0017] This invention uses BOPP film as the base film, and combines the main agent and auxiliary agent to form a two-component adjustable adhesion peel-off coating. Combined with low temperature molding coating and aluminum plating process, it produces a peelable and destructible BOPP holographic peel-off material with stable adhesion, controllable peeling, clear holography, and takes into account both holographic anti-counterfeiting performance and precise peeling performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the layer structure of the present invention; As shown in the figure: 1. BOPP base film layer; 2. Release layer; 3. Imaging layer; 4. Holographic image layer; 5. Aluminum coating layer. Detailed Implementation

[0019] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore merely examples and should not be used to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which this invention pertains. Example 1

[0020] This embodiment takes a small-area revealing BOPP holographic revealing material (retained area ≤30%) as an example to describe its layer structure and manufacturing method in detail.

[0021] like Figure 1 As shown: The holographic peeling materials, from bottom to top, are BOPP base film layer 1, release layer 2, imaging layer 3, holographic image layer 4, and aluminum plating layer 5. Among them, the release layer 2 is a two-component adjustable adhesion peeling coating, which is partially coated on the peeling area of ​​the BOPP base film layer 1.

[0022] The two-component adjustable adhesion peel-off coating of this embodiment includes a main agent and an additive, with a mass ratio of 100:1. The main ingredients and their mass percentages are as follows: Drying alkyd resins (Dow Chemical) 15.0%; Modified polyethylene resin (Dow Chemical) 12.0%; Ethyl acetate 31.0%; Toluene 26.0%; Xylene 13.0%; Dispersant (BYK-9076, Germany) 1.2%; Defoamer (Deqian 3100) 0.5%; Stabilizer (Saint-Lecter 1010) 0.6%; Wetting agent (Dow Corning DC-57) 0.7%; The preparation steps of the main agent are as follows: 1) Pre-mixed solvent preparation: Weigh ethyl acetate, toluene, and xylene according to the mass percentage, put them into the mixing tank, stir at 300 rpm for 10 minutes, mix evenly, and obtain the mixed solvent base; 2) Resin dissolution: Under stirring, add dry alkyd resin and modified polyethylene resin in sequence, heat to 40°C, maintain a speed of 600 rpm, stir for 60 minutes until the resin is completely dissolved and the system is a homogeneous transparent or slightly yellow liquid. 3) Adding additives: Cool down to below 35℃, then add dispersant, wetting agent, stabilizer and defoamer in sequence, and disperse at 600 rpm for 25 minutes to ensure that the additives are evenly dispersed in the resin liquid; 4) Take a sample to determine the viscosity. Use a Forte 4 cup at 25°C. If the viscosity is too high, add a small amount of mixed solvent to adjust it to 10 seconds. Filter through a 200-mesh sieve to remove bubbles, and the main agent coating is obtained. The raw materials and their mass percentages for the additives are as follows: Olefin resin (Baling Petrochemical CPP series) 42.0%; Modified phenolic resin (Zhuyou Chemical PR670) 26.0%; EVA resin (BASF EVA) 20.0%; Mixed solvent 10.0%; Silane coupling agent (Shin-Etsu KBM-403, Japan) 1.2%; Antioxidant (BASF Irganox 1010) 0.8%; The preparation steps of the auxiliary agent are as follows: 1) Solvent preparation: Weigh out the olefin resin, modified phenolic resin and EVA resin by mass percentage, add the mixed solvent, and stir in a disperser at 600 rpm for 40 minutes to fully dissolve or swell the resin and form a uniform resin solution. 2) Grinding and dispersion: Transfer the above resin solution to a sand mill or basket mill, add silane coupling agent and antioxidant, grind and disperse at 1500 rpm for 60 minutes, control the fineness ≤30μm, and obtain the base material; 3) Adjusting viscosity: Transfer the ground base material to the mixing tank. Depending on the solid content, add a small amount of mixed solvent to adjust the application viscosity to 25 seconds at 25°C (French Cup 4).

[0023] The mixed solvents include propyl acetate, butyl acetate, and toluene in a mass ratio of 4:4:2.

[0024] The main agent and auxiliary agent should be thoroughly mixed with a stirrer before use.

[0025] When the release layer is constructed according to this ratio, the release force is 0.3N (transverse force) and the peel force is 0.0007N / mm.

[0026] The steps for fabricating the holographic uncovering material in this embodiment are as follows: 1) On the heat-sealed BOPP base film layer, a release layer is partially coated, that is, a release layer is coated on the area where the base is peeled off. The coating is done using a 140-mesh metal electro-engraving roller with an engraving depth of 45μm and V-shaped cells. The film coating temperature is 90-100-110-110-100℃, the machine speed is 80m / min, and the film surface temperature is 71℃. Before winding, a corona treatment is performed on the wire, with single-sided corona treatment. The corona treatment surface is the heat-sealed layer, and the corona power is 1.5KW. 2) On the BOPP base film layer coated in step 1), a full-coverage imaging layer is coated on the heat-sealed surface. The coating is done using an anilox roller, specifically a 180-mesh ceramic anilox roller, with a wet coating amount of 6.5 g / m². 2 The solid content of the coating is 17%, the coating temperature is 80-90-100-100-90℃, the machine speed is 90m / min, and the film surface temperature is 65℃; the winding point is checked by peeling with 3M tape. 3) On the BOPP base film layer coated in step 2), the holographic image is imprinted onto the transfer imaging coating using a nickel plate with a holographic effect, in the same way as PET molding. The imprinting surface is a heat-sealed surface, the molding temperature is 108℃, the roller pressure is 30kg, and the overall production speed is 60m / min. 4) Apply a dense aluminum coating to the molded surface in step 3), and perform vapor deposition in a vacuum aluminum plating machine to deposit the high-purity aluminum wire at 10... -4 Under vacuum conditions, it is heated to 1700℃ to vaporize, and then cooled and adhered to the holographic molding surface to form an aluminum plating layer. 5) Cut the material processed in step 4) and roll it up with a 3-inch paper core to obtain a small-area revealing finished product.

[0027] The product obtained in this embodiment has a low peeling force value. When peeled off, only a small area of ​​the pattern remains, while the rest of the area is completely destroyed. There is no interlayer peeling or delamination. The holographic pattern is clear and bright. After application, it does not curl up or peel off, thus meeting the anti-counterfeiting requirement of leaving a small area of ​​pattern when peeled off. Example 2

[0028] This embodiment takes medium-area revealing BOPP holographic revealing material (retaining 30%~70% of the bottom surface after revealing) as an example to describe its layer structure and manufacturing method in detail.

[0029] The layer structure in this embodiment is the same as in embodiment 1.

[0030] The two-component adjustable adhesion peel-off coating of this embodiment includes a main agent and an additive, with a mass ratio of 100:3. The main ingredients and their mass percentages are as follows: Dry alkyd resin 13.5%; Modified polyethylene resin 10.5%; Ethyl acetate 32.0%; Toluene 27.0%; Xylene 14.0%; Dispersant 0.9%; Defoamer 0.6%; Stabilizer 0.8%; Wetting agent 0.7%; The types and brands of the above-mentioned raw materials are the same as in Example 1; The preparation steps of the main agent for the release layer are as follows: 1) Pre-mixed solvent preparation: Weigh ethyl acetate, toluene, and xylene according to the mass percentage, put them into the mixing tank, stir at 400 rpm for 8 minutes, mix evenly, and obtain the mixed solvent base; 2) Resin dissolution: Under stirring, add dry alkyd resin and modified polyethylene resin in sequence, heat to 50°C, maintain a speed of 500 rpm, and stir for 45 minutes until the resin is completely dissolved and the system is a homogeneous transparent or slightly yellow liquid. 3) Adding additives: Cool down to below 35℃, then add dispersant, wetting agent, stabilizer and defoamer in sequence, and disperse at 700 rpm for 20 minutes to ensure that the additives are evenly dispersed in the resin liquid; 4) Take a sample to determine the viscosity. Use a Forte 4 cup at 25°C. If the viscosity is too high, add a small amount of mixed solvent to adjust it to 17 seconds. Filter through a 200-mesh sieve to remove bubbles, and the main agent coating is obtained. The raw materials and their mass percentages for the additives are as follows: Olefin resin 45.0%; Modified phenolic resin 23.0%; EVA resin 22.0%; Mixed solvent 8.0%; Silane coupling agent 1.2%; Antioxidant 0.8%; The types and brands of the above raw materials are the same as in Example 1. The preparation steps of the release layer additive are as follows: 1) Solvent preparation: Weigh out the olefin resin, modified phenolic resin and EVA resin by mass percentage, add the mixed solvent, and stir in a disperser at 800 rpm for 30 minutes to fully dissolve or swell the resin and form a uniform resin solution. 2) Grinding and dispersion: Transfer the above resin solution to a sand mill or basket mill, add silane coupling agent and antioxidant, grind and disperse at 2000 rpm for 45 minutes, control the fineness ≤30μm, and obtain the base material; 3) Adjusting viscosity: Transfer the ground base material to the mixing tank. Depending on the solid content, add a small amount of mixed solvent to adjust the application viscosity to 30 seconds at 25°C (French Cup 4).

[0031] The mixed solvents include n-propyl acetate, butyl acetate, and toluene. The mass ratio of the three is 4:4:2.

[0032] The main agent and auxiliary agent should be thoroughly mixed with a stirrer before use.

[0033] The release force is 2N for the cross-section and 0.0020N / mm for the peeling force.

[0034] The steps for fabricating the holographic uncovering material in this embodiment are as follows: 1) On the heat-sealed BOPP base film layer, a release layer is partially coated, that is, a release layer is coated on the area where the base is peeled off. The coating is done using a 140-mesh metal electro-engraving roller with an engraving depth of 45μm and V-shaped cells. The coating temperature is 90-100-110-110-100℃, the machine speed is 80m / min, and the film surface temperature is 71℃. Before winding, a corona treatment is performed on the wire, with single-sided corona treatment. The corona treatment surface is the heat-sealed layer, and the corona power is 1.5KW. 2) On the BOPP base film layer coated in step 1), a full-coverage imaging layer is coated on the heat-sealed surface. The coating is done using an anilox roller, specifically a 180-mesh ceramic anilox roller, with a wet coating amount of 6.5 g / m². 2 The solid content of the coating is 17%, the coating temperature is 80-90-100-100-90℃, the machine speed is 90m / min, and the film surface temperature is 65℃; the winding point is checked by peeling with 3M tape. 3) On the BOPP base film layer coated in step 2), the holographic image is imprinted onto the transfer imaging coating using a nickel plate with a holographic effect, in the same way as PET molding. The imprinting surface is a heat-sealed surface, the molding temperature is 108℃, the roller pressure is 30kg, and the overall production speed is 60m / min. 4) Apply a dense aluminum coating to the molded surface in step 3), and perform vapor deposition in a vacuum aluminum plating machine to deposit the high-purity aluminum wire at 10... -4 Under vacuum conditions, it is heated to 1700℃ to vaporize, and then cooled and adhered to the holographic molding surface to form an aluminum plating layer. 5) Cut the material processed in step 4) and roll it up with a 3-inch paper core to obtain a small-area revealing finished product.

[0035] The product obtained in this embodiment has moderate peeling force, and when peeled off, the medium-sized pattern is completely left behind, with neat edges and controllable damage. The adhesion is balanced and stable, and the holographic effect is clear. It is suitable for scenarios such as confidential packaging and anti-counterfeiting labels with medium-sized backing area. Example 3

[0036] This embodiment takes a large-area revealing BOPP holographic revealing material (with a bottom surface area of ​​>70%) as an example to describe its layer structure and manufacturing method in detail.

[0037] The layer structure in this embodiment is the same as in embodiment 1.

[0038] The two-component adjustable adhesion peel-off coating of this embodiment includes a main agent and an additive, with a mass ratio of 100:6. The main ingredients and their mass percentages are as follows: Dry alkyd resin 16.0%; Modified polyethylene resin 13.0%; Ethyl acetate 28.5%; Toluene 25.0%; Xylene 14.5%; Dispersant 1.0%; Defoamer 0.4%; Stabilizer 0.9%; Wetting agent 0.7%; The types and brands of the above-mentioned raw materials are the same as in Example 1; The preparation steps of the main agent for the release layer are as follows: 1) Pre-mixing of mixed solvents: Weigh ethyl acetate, toluene, and xylene according to the mass percentage, put them into the mixing tank, stir at 500 rpm for 5 minutes, mix evenly, and obtain the mixed solvent base; 2) Resin dissolution: Under stirring, add dry alkyd resin and modified polyethylene resin in sequence, heat to 60°C, maintain a speed of 400 rpm, stir for 30 minutes until the resin is completely dissolved and the system is a homogeneous transparent or slightly yellow liquid. 3) Adding additives: Cool down to below 35℃, add dispersant, wetting agent, stabilizer and defoamer in sequence, and disperse at 800 rpm for 15 minutes to make the additives evenly dispersed in the resin liquid; 4) Take a sample to determine the viscosity. Use a Forte 4 cup at 25°C. If the viscosity is too high, add a small amount of mixed solvent to adjust it to 25 seconds. Filter through a 200-mesh sieve to remove bubbles, and the main agent coating is obtained. The raw materials and their mass percentages for the additives are as follows: Olefin resin 48.0%; Modified phenolic resin 20.0%; EVA resin 24.0%; Mixed solvent 6.0%; Silane coupling agent 1.2%; Antioxidant 0.8%; The types and brands of the above-mentioned raw materials are the same as in Example 1; The preparation steps of the release layer additive are as follows: 1) Solvent preparation: Weigh out the olefin resin, modified phenolic resin and EVA resin by mass percentage, add the mixed solvent, and stir in a disperser at 1000 rpm for 20 minutes to fully dissolve or swell the resin and form a uniform resin solution. 2) Grinding and dispersion: Transfer the above resin solution to a sand mill or basket mill, add silane coupling agent and antioxidant, grind and disperse at 2500 rpm for 30 minutes, control the fineness ≤30μm, and obtain the base material; 3) Adjusting viscosity: Transfer the ground base material to the mixing tank. Depending on the solid content, add a small amount of mixed solvent to adjust the application viscosity to 35 seconds at 25°C (Cooling cup 4).

[0039] The mixed solvents include n-propyl acetate, butyl acetate, and toluene. The mass ratio of the three is 4:4:2.

[0040] The main agent and auxiliary agent should be thoroughly mixed with a stirrer before use.

[0041] The release force is 6N for the cross-section and 0.0050N / mm for the peeling force.

[0042] The steps for fabricating the holographic uncovering material in this embodiment are as follows: 1) On the heat-sealed BOPP base film layer, a release layer is partially coated, that is, a release layer is coated on the area where the base is peeled off. The coating is done using a 140-mesh metal electro-engraving roller with an engraving depth of 45μm and V-shaped cells. The coating temperature is 90-100-110-110-100℃, the machine speed is 80m / min, and the film surface temperature is 71℃. Before winding, a corona treatment is performed on the wire, with single-sided corona treatment. The corona treatment surface is the heat-sealed layer, and the corona power is 1.5KW. 2) On the BOPP base film layer coated in step 1), a full-coverage imaging layer is coated on the heat-sealed surface. The coating is done using an anilox roller, specifically a 180-mesh ceramic anilox roller, with a wet coating amount of 6.5 g / m². 2 The solid content of the coating is 17%, the coating temperature is 80-90-100-100-90℃, the machine speed is 90m / min, and the film surface temperature is 65℃; the winding point is checked by peeling with 3M tape. 3) On the BOPP base film layer coated in step 2), the holographic image is imprinted onto the transfer imaging coating using a nickel plate with a holographic effect, in the same way as PET molding. The imprinting surface is a heat-sealed surface, the molding temperature is 108℃, the roller pressure is 30kg, and the overall production speed is 60m / min. 4) Apply a dense aluminum coating to the molded surface in step 3), and perform vapor deposition in a vacuum aluminum plating machine to deposit the high-purity aluminum wire at 10... -4 Under vacuum conditions, it is heated to 1700℃ to vaporize, and then cooled and adhered to the holographic molding surface to form an aluminum plating layer. 5) Cut the material processed in step 4) and roll it up with a 3-inch paper core to obtain a small-area revealing finished product.

[0043] In summary, the products obtained in Examples 1-3 have high peeling force, adhere firmly to the object being adhered to, leave a complete background of the large-area pattern when peeled off, are controllable in overall damage, prevent malicious peeling, and have stable holographic patterns and metallic luster. They are suitable for large-area background removal scenarios such as sealing tape and high-security anti-counterfeiting labels.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A BOPP holographic removable material that can be peeled off and destroyed, characterized in that... It includes a single-sided heat-sealed BOPP base film layer. The heat-sealed surface of the BOPP base film layer is provided with a release layer, an imaging layer, a holographic image layer, and an aluminum-plated layer from bottom to top. The release layer is a two-component adjustable adhesion peel-off coating, which is partially coated on the area of ​​the BOPP base film layer that will be peeled off.

2. The BOPP holographic removable material according to claim 1, characterized in that... The two-component adjustable adhesion peel-off coating consists of a main agent and additives, with a mass ratio of 100:1-6. The main ingredients and their mass percentages are as follows: Dry alkyd resin 13.5-16.0%; Modified polyethylene resin 10.5-13.0%; Ethyl acetate 28.5-32.0%; Toluene 25.0-27.0%; Xylene 13.0-14.5%; Dispersant 0.9-1.2%; Defoamer 0.4-0.6%; Stabilizer 0.6-0.9%; Wetting agent 0.7%; The raw materials and their mass percentages for the additives are as follows: Olefin resin 42.0-48.0%; Modified phenolic resin 20.0-26.0%; EVA resin 20.0-24.0%; Mixed solvent 6.0-10.0%; Silane coupling agent 1.2%; Antioxidant 0.8%; The mixed solvents include propyl acetate, butyl acetate, and toluene, in a mass ratio of 4:4:

2.

3. The method for manufacturing a removable and destructible BOPP holographic removable material according to claim 1, characterized in that... The steps are as follows: 1) On the heat-sealed BOPP base film layer, a release layer is partially coated, that is, a release layer is coated on the area where the base is peeled off. The coating is done using a metal electro-engraving roller with an engraving depth of 45μm, V-shaped cells, 140 mesh, a coating temperature of 90-100-110-110-100℃, a machine speed of 80m / min, and a film surface temperature of 71℃. Before winding, a corona treatment is performed on the wire, with single-sided corona treatment. The corona treatment surface is the heat-sealed layer, and the corona power is 1.5KW. 2) On the BOPP base film layer coated in step 1), a full-coverage imaging layer is coated on the heat-sealed surface. The coating is done using an anilox roller, specifically a 180-mesh ceramic anilox roller, with a wet coating amount of 6.5 g / m². 2 The solid content of the coating is 17%, the coating temperature is 80-90-100-100-90℃, the machine speed is 90m / min, and the film surface temperature is 65℃. 3) On the BOPP base film layer coated in step 2), the holographic image is imprinted onto the transfer imaging coating using a nickel plate with a holographic effect, in the same way as PET molding. The imprinting surface is a heat-sealed surface, the molding temperature is 108℃, the roller pressure is 30kg, and the overall production speed is 60m / min. 4) Apply a dense aluminum coating to the molded surface in step 3), and perform vapor deposition in a vacuum aluminum plating machine to deposit the high-purity aluminum wire at 10... -4 Under vacuum conditions, it is heated to 1700℃ to vaporize, and then cooled and adhered to the holographic molding surface to form an aluminum plating layer. 5) Cut and roll up the material processed in step 4) according to the required size.

4. The method for manufacturing a removable and destructible BOPP holographic removable material according to claim 3, characterized in that... The preparation steps of the main agent for the release layer are as follows: 1) Pre-mixing of mixed solvents: Weigh ethyl acetate, toluene, and xylene according to the mass percentage, put them into the mixing tank, stir at 300-500 rpm for 5-10 minutes, mix evenly, and obtain the mixed solvent base; 2) Resin dissolution: While stirring, add dry alkyd resin and modified polyethylene resin in sequence, heat to 40-60℃, maintain a speed of 400-600 rpm, stir for 30-60 minutes until the resin is completely dissolved and the system is a homogeneous transparent or slightly yellow liquid. 3) Adding additives: Cool down to below 35℃, then add dispersant, wetting agent, stabilizer and defoamer in sequence, and disperse at 600-800 rpm for 15-25 minutes to ensure that the additives are evenly dispersed in the resin liquid; 4) Take a sample to determine the viscosity. Use a Forte 4 cup at 25°C. If the viscosity is too high, add a small amount of mixed solvent to adjust it to 10-25 seconds. Filter through a 200-mesh sieve to remove bubbles, and the main agent coating is obtained. The preparation steps of the release layer additive are as follows: 1) Solvent preparation: Weigh out the olefin resin, modified phenolic resin and EVA resin by mass percentage, add the mixed solvent, and stir in a disperser at 600-1000 rpm for 20-40 minutes to fully dissolve or swell the resin and form a uniform resin solution. 2) Grinding and dispersion: Transfer the above resin solution to a sand mill or basket mill, add silane coupling agent and antioxidant, grind and disperse at 1500-2500 rpm for 30-60 minutes, control the fineness ≤30μm, and obtain the base material; 3) Adjusting viscosity: Transfer the ground base material to the mixing tank. Depending on the solid content, add a small amount of mixed solvent to adjust the application viscosity to 25–35 seconds at 25°C using a Forco 4 cup.

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