A transparent holographic film and a method for making the same

Abstract

The application discloses a transparent holographic film and a preparation method thereof. The layer structure of the transparent holographic film is sequentially stacked, and sequentially comprises an A coating layer, a base film layer, a B coating layer, a holographic layer and a medium layer from top to bottom. The A coating layer comprises 1-3 parts of a first type of antistatic agent, 79-87 parts of polymethyl methacrylate and 10-20 parts of a hydroxyl type of chlorovinyl resin by weight; the base film layer is arranged between the A coating layer and the B coating layer and is a biaxially stretched polyester film; the B coating layer comprises 0.5-0.8 parts of a second type of antistatic agent, 70-83 parts of polymethyl methacrylate, 7-21 parts of an acrylic modified chlorovinyl resin, 6-22.2 parts of a carboxyl type of chlorovinyl resin and 0.3-0.8 parts of a leveling agent by weight; the holographic layer is arranged between the B coating layer and the medium layer and is transferred with a 180-220 DEG C high-temperature metal plate to form a holographic pattern; and the light transmittance of the medium layer is 88-91%. The transparent holographic film of the application not only does not generate dendritic static lines when the environmental humidity is less than 20%, but also can obtain clear holographic patterns, and the production steps are simple and the cost is low.

Description

Technical Field

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

[0002] To protect the legitimate rights and interests of consumers and merchants, businesses employ various anti-counterfeiting measures to label their products, with transparent holographic anti-counterfeiting labels being one such type. Currently, transparent holographic anti-counterfeiting labels are extremely rare on the market, generally only used in high-end products. This is because transparent holographic labels are produced in low-humidity environments, where ubiquitous static electricity leads to lower coating clarity and the appearance of dendritic static lines, severely affecting the presentation of the holographic pattern. This makes the production of transparent holographic labels extremely difficult and costly.

[0003] Currently, to reduce the dendritic static marks that appear during the production of transparent holographic tags, industry technicians typically perform antistatic treatment on the polyester film surface or add antistatic agents to the coating resin. However, antistatic treatment on the polyester film surface only achieves a certain effect in the short term and increases additional production costs; adding antistatic agents to the coating resin results in a lower transfer rate of the transparent holographic film after high-temperature treatment, and the brightness of the transferred holographic pattern will be greatly reduced, resulting in insufficient holographic brightness and affecting the presentation of the holographic pattern. Summary of the Invention

[0004] To address at least one of the defects or improvement needs of the prior art, the present invention provides a transparent holographic film and its preparation method, which solves the problems of low transfer degree, dendritic electrostatic patterns, high production cost, and unstable production of transparent holographic films.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A transparent holographic film, wherein the layer structure of the transparent holographic film is stacked sequentially, comprising, from top to bottom:

[0007] Coating A: By weight, it includes 1 to 3 parts of Class I antistatic agent, 79 to 87 parts of polymethyl methacrylate and 10 to 20 parts of hydroxyl-type chloroacetic acid resin;

[0008] Base film layer: disposed between coating A and coating B, is a biaxially oriented polyester film;

[0009] Coating B: By weight, it includes 0.5 to 0.8 parts of Class II antistatic agent, 70 to 83 parts of polymethyl methacrylate resin, 7 to 21 parts of acrylic modified chloroacetic acid resin, 6 to 22.2 parts of carboxyl chloroacetic acid resin and 0.3 to 0.8 parts of leveling agent;

[0010] Holographic layer: disposed between the B coating and the medium layer, transferring holographic pattern by high-temperature metal plate;

[0011] Medium layer: disposed on the surface of the holographic layer, light transmittance is 88%~91%.

[0012] Preferably, the first type of antistatic agent includes one or more of conductive antistatic agent or non-conductive antistatic agent containing hydrophilic groups; the second type of antistatic agent includes conductive antistatic agent.

[0013] Preferably, the thickness of the A coating is 0.5~2μm; the thickness of the B coating is 1~3μm; the thickness of the base film layer is 20~60μm.

[0014] Preferably, the material of the medium layer is one or more of zinc sulfide, zinc oxide, zirconium oxide or titanium dioxide, and the material forms the medium layer by plating on the holographic layer.

[0015] Preferably, in the A coating, the molecular weight of polymethyl methacrylate is 50000~60000, and the softening point is 150~170℃; the molecular weight of hydroxyl type chlorovinyl resin is 8000~30000.

[0016] In the B coating, the molecular weight of polymethyl methacrylate is 60000~80000, and the softening point is 160~180℃; the molecular weight of acrylic modified chlorovinyl resin is 8000~15000; the molecular weight of carboxyl type chlorovinyl resin is 5000~15000.

[0017] A preparation method of a transparent holographic film, the method comprising:

[0018] 1~3 parts of the first type of antistatic agent is dissolved in the first type of organic solvent, and after uniform dispersion, 79~87 parts of polymethyl methacrylate and 10~20 parts of hydroxyl type chlorovinyl resin are sequentially added to the first type of organic solvent, and after uniform stirring, an A solution is obtained; the A solution is uniformly coated on the first surface of the base film layer and dried to obtain the A coating and the base film layer which are stacked with each other; wherein the base film layer is a biaxially stretched polyester film.

[0019] 0.5~0.8 parts of the second type of antistatic agent and 0.3~0.8 parts of the leveling agent are dissolved in the second type of organic solvent, and after uniform dispersion, 6~22.2 parts of carboxyl type chlorovinyl resin, 7~21 parts of acrylic modified chlorovinyl resin and 70~83 parts of polymethyl methacrylate are sequentially added to the second type of organic solvent, and after uniform stirring, a B solution is obtained; the B solution is uniformly coated on the second surface of the base film layer and dried to obtain the A coating, the base film layer and the B coating which are sequentially and stacked.

[0020] The B coating is obtained by high-temperature metal plate processing to sequentially stack the A coating, the base film layer, the B coating and the holographic layer;

[0021] A transparent medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0022] Preferably, the first type of antistatic agent includes one or more of conductive antistatic agents or non-conductive antistatic agents containing hydrophilic groups; and the second type of antistatic agent includes conductive antistatic agents.

[0023] Preferably, the solid content of the A solution is 15% to 18%, which is adjusted by the first type of organic solvent; and the solid content of the B solution is 18% to 20%, which is adjusted by the second type of organic solvent.

[0024] Preferably, the material of the medium layer is one or more of zinc sulfide, zinc oxide, zirconium oxide or titanium dioxide, which is formed into the medium layer by plating on the holographic layer.

[0025] Preferably, in the A coating, the molecular weight of the polymethyl methacrylate is 50,000 to 60,000, and the softening point is 150 to 170℃; the molecular weight of the hydroxyl type chlorovinyl resin is 8,000 to 30,000.

[0026] In the B coating, the molecular weight of the polymethyl methacrylate is 60,000 to 80,000, and the softening point is 160 to 180℃; the molecular weight of the acrylic modified chlorovinyl resin is 8,000 to 15,000; and the molecular weight of the carboxyl type chlorovinyl resin is 5,000 to 15,000.

[0027] Overall, compared with the prior art, the technical solution conceived by the present application can achieve the following beneficial effects:

[0028] (1) The transparent holographic film and the preparation method thereof provided by the present application perform "sandwich" setting of the A coating and the B coating on the upper and lower base film layers, which is a two-pronged approach. On the one hand, the A coating reduces the frictional static electricity of the transparent holographic film and the equipment while adjusting the dendritic static lines. On the other hand, the B coating reduces the frictional static electricity while taking into account the high-temperature transfer of the holographic pattern and adjusting the clarity of the holographic pattern. In addition, since the transparent holographic film is more likely to generate static electricity in a dry environment, it needs to be produced in an environment with low humidity. However, the present application performs "sandwich" setting of the A coating and the B coating on the upper and lower base film layers and adds corresponding antistatic agents, so that the transparent holographic film does not generate dendritic static lines even when the production environment humidity is less than 20%, and the degree of transfer of the holographic pattern is high, which can maintain high clarity and brightness.

[0029] (2) The transparent holographic film and the preparation method thereof provided by the application, the dosage of the antistatic agent in the A coating layer is 1-3 parts, and the conductive antistatic agent or the non-conductive antistatic agent containing a hydrophilic group is added, the dosage of the antistatic agent in the B coating layer is 0.5-0.8 parts, and the conductive antistatic agent is added; no matter the antistatic agent in the A coating layer or the antistatic agent in the B coating layer, if the dosage is too much, the physical and mechanical properties of the main resin will be reduced, and if the dosage is too little, the corresponding effect cannot be achieved, therefore, the antistatic agent needs to be controlled to keep a moderate dosage; it needs to be noted that after the corresponding antistatic agent is added in the A coating layer and the B coating layer, the effects are also different, the effect of the A coating layer is only to coat a layer of coating on the surface of the film to reduce the static electricity generated by the friction of the film or to conduct the accumulated static electricity, the effect of the B coating layer is to not only reduce the accumulation of static electricity, but also to ensure the transparency and to transfer the holographic pattern at high temperature, therefore, the addition amount of the B coating layer is more limited.

[0030] (2) The transparent holographic film and the preparation method thereof provided by the application, the corresponding antistatic agent is added in the A coating layer and the B coating layer respectively, and a coating layer with strong stability can be obtained; not only the production cost is reduced, but also the manufacturing process is simple, the influence of the environmental humidity is reduced to a certain extent, the production environment is more stable, and large-scale industrial production is facilitated; in addition, the transparent holographic film can be processed into gold stamping paper or a mark. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following only represent some of the embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0032] Figure 1 The layer structure schematic diagram of the transparent holographic film and the preparation method thereof of the application;

[0033] 1-A coating layer; 2-base film layer; 3-B coating layer; 4-holographic layer; 5-medium layer;

[0034] 21-first surface of the base film layer; 22-second surface of the base film layer. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the application more clearly understood, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application. In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as there is no conflict.

[0036] The terms "first", "second", "third" and the like in the description and in the claims of the present application and above figures are used for distinguishing between similar objects, not necessarily for describing a specific sequential or chronological order. The terms "comprises", "comprising", "includes", "including" and the like are to be construed open-ended, allowing for instances where there are equivalents to the specified features. For example, a process, method, article, or apparatus that comprises a list of steps or components does not necessarily require the order of the steps or the presence of the components to be followed or present, respectively, but can optionally include other steps or components inherent to the process, method, article, or apparatus or logical substitutions, permutations of components and / or steps, and equivalent ones.

[0037] Figure 1 is a schematic diagram of a layer structure of a transparent holographic film and a preparation method thereof according to the present application, the layer structure of the transparent holographic film is sequentially stacked, and from top to bottom, sequentially comprises an A coating layer 1, a base film layer 2, a B coating layer 3, a holographic layer 4, and a medium layer 5.

[0038] The components of the A coating layer 1 include, by weight fraction, 1-3 parts of a first type of antistatic agent, 79-87 parts of polymethyl methacrylate, and 10-20 parts of a hydroxyl type of chlorovinyl resin; the thickness is preferably 0.5-2 μm.

[0039] The first type of antistatic agent is preferably one or more of a conductive type of antistatic agent or a non-conductive type of antistatic agent containing a hydrophilic group, mainly for reducing the frictional static electricity of the transparent holographic film and the equipment while adjusting the dendritic static lines; it is to be noted that the hydrophilic group in the non-conductive type of antistatic agent containing a hydrophilic group can adsorb the moisture in the air, ensuring the surface humidity of the A coating layer 1 and reducing the frictional static electricity.

[0040] As a preferred embodiment of the present application, in the A coating layer 1, the polymethyl methacrylate is used as the main resin, with a molecular weight of 50000-60000 and a softening point of 150-170°C; since the effects of the A coating layer and the B coating layer are different, high-temperature transfer printing of the holographic pattern is not required, so the molecular weight of the main resin is smaller, which can maintain good definition while also controlling the cost; the hydroxyl type of chlorovinyl resin is used as an auxiliary resin, with a molecular weight of 8000-30000, for improving the brightness of the A coating layer 1.

[0041] The base film layer 2 is arranged between the A coating layer 1 and the B coating layer 3, and is a biaxially stretched polyester film; the thickness is preferably 20-60 μm.

[0042] The components of the B coating layer 3 include, by weight fraction, 0.5-0.8 parts of a second type of antistatic agent, 70-83 parts of polymethyl methacrylate, 7-21 parts of an acrylic modified chlorovinyl resin, 6-22.2 parts of a carboxyl type of chlorovinyl resin, and 0.3-0.8 parts of a leveling agent; the thickness is preferably 1-3 μm, and too thick will affect the transfer printing effect and the physical and mechanical properties, while too thin will not have a good transfer printing effect.

[0043] The second type of antistatic agent is preferably a conductive antistatic agent, mainly to reduce the friction static electricity while taking into account the high-temperature transfer of the holographic pattern, to ensure the clarity of the B coating, and to better adjust the clarity of the holographic pattern. It should be noted that the non-conductive antistatic agent containing a hydrophilic group is not used here in order to prevent affecting the clarity of the holographic pattern.

[0044] Preferably, in the B coating 3, the polymethyl methacrylate resin is used as the main resin, with a molecular weight of 60,000-80,000 and a softening point of 160-180°C. Unlike the main resin in the A coating 1, the polymethyl methacrylate resin in the B coating 3 mainly plays a role in thermal transfer, so the molecular weight of the main resin is larger than that in the A coating. The acrylic-modified chlorovinyl resin is used as an auxiliary resin, with a molecular weight of 8,000-15,000, in order to improve the brightness and resin compatibility of the B coating 3. The carboxyl-type chlorovinyl resin is used as an auxiliary resin, with a molecular weight of 5,000-15,000, in order to improve the brightness of the B coating 3 while also improving the adhesion of the B coating 3 to the medium layer. In addition, the molecular weight of the hydroxyl-type chlorovinyl resin used in the B coating is smaller than that in the A coating, because the content of the antistatic agent in the B coating is relatively small, and the use of chlorovinyl resin with a lower molecular weight makes it easier to migrate to the surface of the coating to achieve the antistatic effect. The leveling agent is used as an auxiliary agent to facilitate the formation of a flat, smooth, and uniform plane during the drying and film-forming process of the B coating 3. The leveling agent can be one or a mixture of several of the following types: organic solvent, acrylic, silicone, and fluorocarbon compounds, with the acrylic type being preferred.

[0045] The holographic layer 4 is arranged between the B coating 3 and the medium layer 5, and the holographic pattern is transferred by a high-temperature metal plate at a temperature of 180-220°C, because the softening temperature of the main resin is within this range. The high-temperature metal plate is preferably a nickel plate, which is hard and has high pressure and is not easily deformed.

[0046] The medium layer 5 is arranged on the surface of the holographic layer 4, with a light transmittance of 88%-91%, and its material is one or a mixture of several of the following types: zinc sulfide, zinc oxide, zirconium oxide, or titanium dioxide. The medium layer 5 is formed by plating on the holographic layer 4, and the zinc sulfide plating layer is preferred.

[0047] As another aspect of the present application, a method for preparing a transparent holographic film is provided, which method comprises:

[0048] Preparation of A coating 1, specifically, 1-3 parts of the first type of antistatic agent is dissolved in the first type of organic solvent, after being uniformly dispersed, 79-87 parts of polymethyl methacrylate and 10-20 parts of hydroxyl type chlorovinyl resin are added into the first type of organic solvent, after being uniformly stirred, A solution is obtained, the solid content of the A solution is adjusted to 15%-18% and then uniformly coated on the first surface 21 of the base film layer and dried to obtain the A coating 1 and the base film layer 2 which are stacked on each other.

[0049] Preparation of B coating 2, specifically, 0.5-0.8 parts of the second type of antistatic agent and 0.3-0.8 parts of leveling agent are dissolved in the second type of organic solvent, after being uniformly dispersed, 6-22.2 parts of carboxyl type chlorovinyl resin, 7-21 parts of acrylic modified chlorovinyl resin and 70-83 parts of polymethyl methacrylate resin are added into the second type of organic solvent, after being uniformly stirred, B solution is obtained, the solid content of the B solution is adjusted to 18%-20% and then uniformly coated on the second surface 22 of the base film layer and dried to obtain the A coating 1, the base film layer 2 and the B coating 3 which are sequentially stacked.

[0050] Then the B coating 3 is treated by a high-temperature metal plate of 180-220℃ to obtain the A coating 1, the base film layer 2, the B coating 3 and the holographic layer 4 which are sequentially stacked.

[0051] Finally, a transparent dielectric layer 5 is vacuum evaporated on the surface of the holographic layer 4 to obtain the transparent holographic film.

[0052] Preferably, in the A coating 1, the molecular weight of the polymethyl methacrylate is 50000-60000 and the softening point is 150-170℃; the molecular weight of the hydroxyl type chlorovinyl resin is 8000-30000; in the B coating 3, the molecular weight of the polymethyl methacrylate resin is 60000-80000 and the softening point is 160-180℃; the molecular weight of the acrylic modified chlorovinyl resin is 8000-15000; the molecular weight of the carboxyl type chlorovinyl resin is 5000-15000.

[0053] As an embodiment of the present application, the base film layer is a biaxially stretched polyester film, the high-temperature metal plate is preferably a nickel plate and the material of the dielectric layer is one or several of zinc sulfide, zinc oxide, zirconium oxide or titanium dioxide.

[0054] The first type of solvent and the second type of solvent are consistent or inconsistent.

[0055] The solid content of the A solution is adjusted by adding the first type of organic solvent, the first type of organic solvent includes one of toluene, butanone or n-propyl acetate, the mass ratio of the first type of organic solvent in the A solution is 78-82%, the drying temperature is 180-220℃, the first type of organic solvent is evaporated during drying, and the first type of antistatic agent includes one or several of conductive antistatic agent or non-conductive antistatic agent containing hydrophilic groups.

[0056] The solid content of the B solution is adjusted by adding a second type of organic solvent, which includes one of toluene, butanone or n-propyl acetate, and the mass ratio of the second type of organic solvent to the B solution is 78-82%, and the drying temperature is 180-220 DEG C, and the second type of organic solvent is evaporated during drying, and the second type of antistatic agent includes a conductive antistatic agent.

[0057] The present application adopts the A coating layer and the B coating layer arranged on the base film layer respectively, and solves the problems of low transfer degree, branch-like static lines, high production cost and unstable production of the transparent holographic film

[0058] Comparative Example 1

[0059] 0.5 parts of the first type of antistatic agent is dissolved in the first type of organic solvent, and after being uniformly dispersed, 79.5 parts of polymethyl methacrylate and 20 parts of hydroxyl type chlorovinyl resin are sequentially added into the first type of organic solvent, and after being uniformly stirred, the A solution is obtained, and the solid content of the A solution is adjusted to 18% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are stacked with each other.

[0060] 0.5 parts of the second type of antistatic agent and 0.8 parts of the leveling agent are dissolved in the second type of organic solvent, and after being uniformly dispersed, 8.7 parts of carboxyl type chlorovinyl resin, 7 parts of acrylic modified chlorovinyl resin and 83 parts of polymethyl methacrylate resin are sequentially added into the second type of organic solvent, and after being uniformly stirred, the B solution is obtained, and the solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and stacked.

[0061] Then the B coating layer is treated by a 220 DEG C high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and stacked.

[0062] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0063] Comparative Example 2

[0064] 3 parts of the first type of antistatic agent is dissolved in the first type of organic solvent, and after being uniformly dispersed, 87 parts of polymethyl methacrylate and 10 parts of hydroxyl type chlorovinyl resin are sequentially added into the first type of organic solvent, and after being uniformly stirred, the A solution is obtained, and the solid content of the A solution is adjusted to 15% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are stacked with each other.

[0065] 0.9 parts of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 7.8 parts of the carboxyl type chlorovinyl resin, 21 parts of the acrylic modified chlorovinyl resin and 70 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 20% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0066] Then the B coating layer is treated by the 200℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0067] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0068] Comparative Example Three

[0069] 3 parts of the first antistatic agent are dissolved in the first organic solvent, 87 parts of the polymethyl methacrylate and 10 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 15% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0070] 1 part of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 6.7 parts of the carboxyl type chlorovinyl resin, 9 parts of the acrylic modified chlorovinyl resin and 83 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0071] Then the B coating layer is treated by the 215℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0072] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0073] Comparative Example Four

[0074] 1 part of the first antistatic agent is dissolved in the first organic solvent, 79 parts of the polymethyl methacrylate and 20 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 18% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0075] 0.4 parts of the second antistatic agent and 0.8 parts of the leveling agent are dissolved in the second organic solvent, 8.8 parts of the carboxyl type chlorovinyl resin, 7 parts of the acrylic modified chlorovinyl resin and 83 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0076] Then the B coating layer is treated by the 220℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0077] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0078] Comparative Example Five

[0079] 0.9 parts of the first antistatic agent is dissolved in the first organic solvent, 87 parts of the polymethyl methacrylate and 12.1 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 18% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0080] 0.4 parts of the second antistatic agent and 0.8 parts of the leveling agent are dissolved in the second organic solvent, 10.8 parts of the carboxyl type chlorovinyl resin, 10 parts of the acrylic modified chlorovinyl resin and 78 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0081] Then the B coating layer is treated by the 220℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0082] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0083] Comparative Example Six

[0084] 1.6 parts of the first antistatic agent is dissolved in the first organic solvent, 83.4 parts of the polymethyl methacrylate and 15 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 18% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0085] 0.4 parts of the second antistatic agent and 0.8 parts of the leveling agent were dissolved in the second organic solvent, 14.8 parts of the carboxyl type chlorovinyl resin, 10 parts of the acrylic modified chlorovinyl resin and 74 parts of the polymethyl acrylic resin were sequentially added into the second organic solvent, and the B solution was obtained after stirring uniformly. The solid content of the B solution was adjusted to 18% and then uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which were sequentially stacked.

[0086] Then the B coating layer was treated by the 220℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which were sequentially stacked.

[0087] Finally, a zinc sulfide medium layer was vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0088] Comparative Example Seven

[0089] 2.7 parts of the first antistatic agent were dissolved in the first organic solvent, 79.3 parts of the polymethyl methacrylate and 18 parts of the hydroxyl type chlorovinyl resin were sequentially added into the first organic solvent after uniform dispersion, and the A solution was obtained after stirring uniformly. The solid content of the A solution was adjusted to 18% and then uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which were stacked with each other.

[0090] 0.4 parts of the second antistatic agent and 0.8 parts of the leveling agent were dissolved in the second organic solvent, 8.8 parts of the carboxyl type chlorovinyl resin, 19 parts of the acrylic modified chlorovinyl resin and 71 parts of the polymethyl acrylic resin were sequentially added into the second organic solvent after uniform dispersion, and the B solution was obtained after stirring uniformly. The solid content of the B solution was adjusted to 18% and then uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which were sequentially stacked.

[0091] Then the B coating layer was treated by the 220℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which were sequentially stacked.

[0092] Finally, a zinc sulfide medium layer was vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0093] Comparative Example Eight

[0094] 3.2 parts of the first antistatic agent were dissolved in the first organic solvent, 79 parts of the polymethyl methacrylate and 17.8 parts of the hydroxyl type chlorovinyl resin were sequentially added into the first organic solvent after uniform dispersion, and the A solution was obtained after stirring uniformly. The solid content of the A solution was adjusted to 15% and then uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which were stacked with each other.

[0095] 0.4 parts of the second antistatic agent and 0.8 parts of the leveling agent are dissolved in the second organic solvent, 21.8 parts of the carboxyl type chlorovinyl resin, 7 parts of the acrylic modified chlorovinyl resin and 70 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0096] Then the B coating layer is treated by the 220℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0097] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0098] Example One

[0099] 1 part of the first antistatic agent is dissolved in the first organic solvent, 79 parts of the polymethyl methacrylate and 20 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 18% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0100] 0.5 parts of the second antistatic agent and 0.8 parts of the leveling agent are dissolved in the second organic solvent, 8.7 parts of the carboxyl type chlorovinyl resin, 7 parts of the acrylic modified chlorovinyl resin and 83 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0101] Then the B coating layer is treated by the 220℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0102] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0103] Example Two

[0104] 3 parts of the first antistatic agent are dissolved in the first organic solvent, 87 parts of the polymethyl methacrylate and 10 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 15% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0105] 0.8 parts of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 7.9 parts of the carboxyl type chlorovinyl resin, 21 parts of the acrylic modified chlorovinyl resin and 70 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 20% and then uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0106] Then the B coating layer is treated by the 200℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0107] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0108] Example Three

[0109] 3 parts of the first antistatic agent are dissolved in the first organic solvent, 87 parts of the polymethyl methacrylate and 10 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 15% and then uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0110] 0.8 parts of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 6.9 parts of the carboxyl type chlorovinyl resin, 9 parts of the acrylic modified chlorovinyl resin and 83 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and then uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0111] Then the B coating layer is treated by the 215℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0112] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0113] Example Four

[0114] 1 part of the first antistatic agent is dissolved in the first organic solvent, 79 parts of the polymethyl methacrylate and 20 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 18% and then uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0115] 0.8 parts of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 6 parts of the carboxyl type chlorovinyl resin, 9.9 parts of the acrylic modified chlorovinyl resin and 83 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0116] Then the B coating layer is treated by the 215℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0117] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0118] Example Five

[0119] 1.5 parts of the first antistatic agent are dissolved in the first organic solvent, 87 parts of the polymethyl methacrylate and 11.5 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 16% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0120] 0.6 parts of the second antistatic agent and 0.5 parts of the leveling agent are dissolved in the second organic solvent, 8.9 parts of the carboxyl type chlorovinyl resin, 12 parts of the acrylic modified chlorovinyl resin and 78 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0121] Then the B coating layer is treated by the 215℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0122] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0123] Example Six

[0124] 2 parts of the first antistatic agent are dissolved in the first organic solvent, 83 parts of the polymethyl methacrylate and 15 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 16% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0125] 0.7 parts of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 11 parts of the carboxyl type chlorovinyl resin, 14 parts of the acrylic modified chlorovinyl resin and 74 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0126] Then the B coating layer is treated by the 215℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0127] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0128] Example Seven

[0129] 2.5 parts of the first antistatic agent are dissolved in the first organic solvent, 79.5 parts of the polymethyl methacrylate and 18 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 17% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0130] 0.8 parts of the second antistatic agent and 0.3 parts of the leveling agent are dissolved in the second organic solvent, 9.9 parts of the carboxyl type chlorovinyl resin, 18 parts of the acrylic modified chlorovinyl resin and 71 parts of the polymethyl acrylic resin are sequentially added into the second organic solvent after being uniformly dispersed, and the B solution is obtained after being uniformly stirred. The solid content of the B solution is adjusted to 18% and uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially and laminatedly arranged.

[0131] Then the B coating layer is treated by the 215℃ high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially and laminatedly arranged.

[0132] Finally, a zinc sulfide medium layer is vacuum evaporated on the surface of the holographic layer to obtain the transparent holographic film.

[0133] Example Eight

[0134] 2 parts of the first antistatic agent are dissolved in the first organic solvent, 79 parts of the polymethyl methacrylate and 19 parts of the hydroxyl type chlorovinyl resin are sequentially added into the first organic solvent after being uniformly dispersed, and the A solution is obtained after being uniformly stirred. The solid content of the A solution is adjusted to 16% and uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are laminatedly arranged.

[0135] 0.5 parts of the second type of antistatic agent and 0.3 parts of the leveling agent were dissolved in the second type of organic solvent and dispersed evenly. Then, 22.2 parts of carboxyl-type chloroacetic acid resin, 7 parts of acrylic acid-modified chloroacetic acid resin and 70 parts of polymethyl methacrylate resin were added to the second type of organic solvent in sequence and stirred evenly to obtain solution B. The solid content of solution B was adjusted to 18% and then evenly coated on the second surface of the base film layer and dried to obtain coating A, base film layer and coating B stacked in sequence.

[0136] Then, the B coating is processed by a high-temperature metal plate at 215°C to obtain the A coating, base film layer, B coating and holographic layer stacked in sequence.

[0137] Finally, a zinc sulfide dielectric layer is deposited on the surface of the holographic layer by vacuum evaporation to obtain a transparent holographic film.

[0138] Table 1 Comparison of experimental results from different comparative examples and embodiments.

[0139]

[0140] Table 1 compares the experimental results of different comparative examples and embodiments. The comparison reveals that the preparation of coating A affects the dendritic electrostatic patterns of the holographic film, while the preparation of coating B affects the clarity of the holographic pattern. To obtain a transparent holographic film with high transfer efficiency and no dendritic electrostatic patterns, it is necessary to consider both coating A and coating B simultaneously. Since antistatic agents can absorb moisture from the air or form conductive channels through their own dissociation ions, allowing charges to quickly move away from the surface and reducing the negative effects of static electricity, the higher the dosage of the first type of antistatic agent in coating A, the better. However, to achieve antistatic effects while reducing costs, and to control both cost and clarity, the dosage of the first type of antistatic agent needs to be controlled within 1 to 3 parts. Because the antistatic agent in coating B is conductive, typically an inorganic salt, it has poor solubility with polymer resins. Furthermore, during high-temperature holographic pattern transfer, the small molecule solvents of the inorganic salt migrate to the coating surface and adhere to the holographic metal plate, causing fixation defects and preventing the complete transfer of the holographic pattern. Therefore, the lower the dosage of the second type of antistatic agent in coating B, the better. However, since coating B primarily aims to increase antistatic effects while also ensuring high-temperature heat transfer performance, the dosage of the second type of antistatic agent needs to be controlled within 0.5 to 0.8 parts. This ensures both antistatic effectiveness and a clear holographic pattern.

[0141] In summary, the present invention provides a transparent holographic film and its preparation method. The transparent holographic film not only does not produce dendritic electrostatic patterns when the humidity of the production environment is below 20%, but also maintains high clarity and produces clear holographic patterns. In addition, the production steps are simple, the cost is low, the production is stable, and it can be mass-produced. It can also be processed into hot stamping foil or logos, making it more convenient and versatile.

[0142] It should be noted that, for the foregoing method embodiments, the acts described are merely provided as examples, and that the acts can be combined in different order, or some acts can be omitted, or some acts can be added, without departing from the scope of the disclosure. Furthermore, those skilled in the art will appreciate that the embodiments described above are merely exemplary, and that the acts described above can be replaced by other acts, or one or more acts can be used to achieve the same or similar results, and that these variations are intended to be within the scope of the disclosure.

[0143] In the above embodiments, the description of each embodiment is focused on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments. The above described are only exemplary embodiments of the disclosure, and cannot limit the scope of the disclosure. Any equivalent changes and modifications made according to the teachings of the disclosure are still within the scope of the disclosure. Those skilled in the art will easily think of other embodiments of the disclosure after considering the specification and practicing the disclosure herein. The disclosure is intended to cover any variations, uses, or adaptive changes of the disclosure, which follow the general principles of the disclosure and include common knowledge or conventional technical means in the art that are not described in the disclosure. The specification and embodiments are only considered as exemplary, and the scope and spirit of the disclosure are defined by the claims.

[0144] The technical features of the above embodiments can be combined in any way, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the disclosure.

[0145] Those skilled in the art will readily understand that the above described are only preferred embodiments of the present application, and are not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A transparent holographic film, characterized by, The layer structure of the transparent holographic film is sequentially stacked, and from top to bottom comprises in sequence: The A coating layer comprises 1-3 parts of the first type of antistatic agent, 79-87 parts of polymethyl methacrylate and 10-20 parts of hydroxyl type chlorovinyl resin by weight; the first type of antistatic agent comprises one or more of conductive antistatic agents or non-conductive antistatic agents containing hydrophilic groups; in the A coating layer, the molecular weight of the polymethyl methacrylate is 50000-60000, and the softening point is 150-170℃; the molecular weight of the hydroxyl type chlorovinyl resin is 8000-30000; The base film layer is provided between the A coating layer and the B coating layer, and is a biaxially stretched polyester film; The B coating layer comprises 0.5-0.8 parts of the second type of antistatic agent, 70-83 parts of polymethyl methacrylate, 7-21 parts of acrylic modified chlorovinyl resin, 6-22.2 parts of carboxyl type chlorovinyl resin and 0.3-0.8 parts of leveling agent by weight; the second type of antistatic agent comprises a conductive antistatic agent; in the B coating layer, the molecular weight of the polymethyl methacrylate is 60000-80000, and the softening point is 160-180℃; the molecular weight of the acrylic modified chlorovinyl resin is 8000-15000; the molecular weight of the carboxyl type chlorovinyl resin is 5000-15000; The holographic layer is provided between the B coating layer and the medium layer, and the holographic pattern is transferred by a high-temperature metal plate; The medium layer is provided on the surface of the holographic layer, and the light transmittance is 88%-91%.

2. A transparent holographic film as claimed in claim 1, wherein, The thickness of the A coating layer is 0.5-2μm; the thickness of the B coating layer is 1-3μm; the thickness of the base film layer is 20-60μm.

3. A transparent holographic film as defined in claim 1, wherein, The material of the medium layer is one or more of zinc sulfide, zinc oxide, zirconium oxide or titanium dioxide, and the material forms the medium layer by plating on the holographic layer.

4. A method of making a transparent holographic film, characterized by, The method comprises: 1-3 parts of the first type of antistatic agent are dissolved in the first type of organic solvent, and after uniform dispersion, 79-87 parts of polymethyl methacrylate and 10-20 parts of hydroxyl type chlorovinyl resin are sequentially added to the first type of organic solvent, and after uniform stirring, an A solution is obtained; the A solution is uniformly coated on the first surface of the base film layer and dried to obtain the A coating layer and the base film layer which are stacked on each other; wherein the base film layer is a biaxially stretched polyester film; the first type of antistatic agent comprises one or more of conductive antistatic agents or non-conductive antistatic agents containing hydrophilic groups; 0.5-0.8 parts of the second type of antistatic agent and 0.3-0.8 parts of the leveling agent are dissolved in the second type of organic solvent, and after uniform dispersion, 6-22.2 parts of carboxyl type chlorovinyl resin, 7-21 parts of acrylic modified chlorovinyl resin and 70-83 parts of polymethyl methacrylate are sequentially added to the second type of organic solvent, and after uniform stirring, a B solution is obtained; the B solution is uniformly coated on the second surface of the base film layer and dried to obtain the A coating layer, the base film layer and the B coating layer which are sequentially stacked; the second type of antistatic agent comprises a conductive antistatic agent; The B coating layer is treated by a high-temperature metal plate to obtain the A coating layer, the base film layer, the B coating layer and the holographic layer which are sequentially stacked; A transparent medium layer is vacuum deposited on the surface of the holographic layer to obtain a transparent holographic film; In the A coating, the molecular weight of polymethyl methacrylate is 50000-60000, and the softening point is 150-170 DEG C; the molecular weight of hydroxyl type chlorovinyl acetate resin is 8000-30000; In the B coating, the molecular weight of polymethyl methacrylate resin is 60000-80000, and the softening point is 160-180 DEG C; the molecular weight of acrylic modified chlorovinyl acetate resin is 8000-15000; the molecular weight of carboxyl type chlorovinyl acetate resin is 5000-15000.

5. A method of making a transparent holographic film according to claim 4, wherein, The solid content of the A solution is 15%-18%, and the solid content is adjusted by the first type of organic solvent; the solid content of the B solution is 18%-20%, and the solid content is adjusted by the second type of organic solvent.

6. A method of making a transparent holographic film according to any one of claims 4-5, wherein, The material of the medium layer is one or several of zinc sulfide, zinc oxide, zirconium oxide or titanium dioxide, and the material is used to form the medium layer by coating on the holographic layer.

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