Glitter powder film, manufacturing method thereof and acrylic product

Abstract

The invention relates to a shimmering powder film and a manufacturing method thereof and an acrylic product, the shimmering powder film comprises a micro-optical functional layer, a reflecting layer, a protective layer, an adhesive layer and a release film, the micro-optical functional layer comprises a base material layer and a microstructure layer connected with the base material layer, and the microstructure layer is formed by imprinting a plurality of micro-lenses on UV light-cured resin; the reflecting layer comprises a resin carrier layer and a plurality of shimmering powder particles, the resin carrier layer is connected with the side, away from the base material layer, of the microstructure layer, and the shimmering powder particles are directionally arranged on the resin carrier layer; the protective layer is connected with one side, away from the microstructure layer, of the substrate layer; one side of the adhesive layer is connected with one side, far away from the substrate layer, of the reflecting layer, and the other side is connected with the release film; according to the shimmering powder film, ambient light is converged to the surfaces of the shimmering powder particles through the micro lenses, reflected light passes through the micro lenses twice from the surfaces of the shimmering powder particles to be amplified and scattered, strong flash beam-shaped scattering is formed, the brightness is remarkably improved, the relatively strong flickering feeling is achieved, and the visual attraction is improved; the manufacturing method of the shimmering powder film is simple and easy to control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of decorative film, in particular to a glitter film, a manufacturing method thereof and an acrylic product. BACKGROUND

[0002] At present, in order to be beautiful, acrylic toys generally use printing patterns, spraying patterns or pasting ordinary color films on the background plate or the bottom plate as decoration, but there are significant shortcomings of single visual effect and lack of three-dimensional effect. Therefore, glitter is directly applied to acrylic substrates for decoration on the market, including the following production methods: 1. Coating glue on the acrylic substrate, and then manually sprinkling powder on the glue, but manual sprinkling is low in efficiency and high in cost; 2. Using paint containing glitter for spraying or ink containing glitter for printing, which has problems of uneven distribution of glitter, easy falling off and uneven surface; 3. Directly embedding glitter particles in the acrylic substrate, but the process is complex, affecting the strength and optical properties of the material. SUMMARY

[0003] Therefore, it is necessary to provide a glitter film, a manufacturing method thereof and an acrylic product in view of the above problems.

[0004] A glitter film includes a micro-optical functional layer, a reflection layer, a protective layer, a glue layer and a release film. The micro-optical functional layer includes a substrate layer and a microstructure layer connected to the substrate layer. The microstructure layer is formed by pressing a plurality of microlenses on a UV light curing resin. The reflection layer includes a resin carrier layer and a plurality of glitter particles. The resin carrier layer is connected to the side of the microstructure layer away from the substrate layer. Each of the glitter particles is arranged in the resin carrier layer. The protective layer is connected to the side of the substrate layer away from the microstructure layer. One side of the glue layer is connected to the side of the reflection layer away from the substrate layer, and the other side is connected to the release film.

[0005] In one embodiment, the substrate layer is an optical grade PET film. The microlens is a hexagonal pyramid microlens. The resin carrier layer is a weather-resistant PUA resin. The glitter particles are flaky aluminum powder. The glue layer is a fluorine-modified acrylic ester pressure-sensitive adhesive.

[0006] In one embodiment, the protective layer is a wear-resistant layer and / or an oil-repellent layer. When the protective layer is a wear-resistant layer and an oil-repellent layer, one side of the wear-resistant layer is connected to the substrate layer, and the other side is connected to the oil-repellent layer.

[0007] A glitter film manufacturing method is based on the above glitter film and includes the following steps: Microstructure imprinting: after coating the UV light curing resin on the substrate layer, a plurality of the microlenses are imprinted on the UV light curing resin under the cooperation of UV light irradiation and the imprinting roller, to obtain a microstructure layer; Electrostatic implantation of flash powder particles and magnetic field orientation: a resin carrier layer added with a UV stabilizer is coated on the side of the microstructure layer away from the substrate layer, the flash powder particles are charged by applying high pressure, and then the charged flash powder particles are uniformly and directionally arranged in the resin carrier layer by electrostatic spraying under the action of an alternating magnetic field; the resin carrier layer is then fixed by UV light curing, so as to fix the inclination angle of the flash powder particles; Adhesive layer compounding: an adhesive layer is compounded on the cured resin carrier layer; Protective layer spraying: after the adhesive layer coating is completed, a protective layer is sprayed on the side of the substrate layer away from the microstructure layer.

[0008] In one of the embodiments, in the microstructure imprinting step, the temperature of the imprinting roller is 50-70°C.

[0009] In one of the embodiments, when the resin carrier layer added with a UV stabilizer is coated on the side of the microstructure layer away from the substrate layer, the thickness of the resin carrier layer is 60-100μm, the temperature is 25-45°C, and the viscosity is 1000-1400cp.

[0010] In one of the embodiments, before the step of applying high pressure to charge the flash powder particles, the flash powder particles need to be coated with a Fe3O4 magnetic field response layer, including the following steps: Preparation of flash powder slurry: the flash powder particles are added to a mixed solution of deionized water and anhydrous ethanol, and a dispersing agent is added, followed by stirring, to obtain a flash powder slurry; Preparation of iron ion mixed solution: FeCl3•6H2O solution and FeSO4•7H2O solution are uniformly prepared into a mixed solution in a molar ratio of Preparation of iron ion mixed solution: FeCl3•6H2O solution and FeSO4•7H2O solution are uniformly prepared into a mixed solution in a molar ratio of Adsorption of iron ions: nitrogen gas is passed into the flash powder slurry, and the iron ion mixed solution is slowly added to the flash powder slurry while the flash powder slurry is rapidly stirred, so that the iron ions are adsorbed on the surface of the flash powder particles; Co-precipitation reaction: the flash powder slurry after the completion of iron ion adsorption is controlled at 50-70°C, ammonia water is added to the flash powder slurry so that the pH value of the solution is 10.1-11, and nitrogen gas is continuously passed into the flash powder slurry to exclude oxygen, so as to prevent from being oxidized to , and the following reaction occurs: , to obtain Fe3O4, which is coated on the surface of the flash powder particles in the form of crystal nucleus growth; Thermal aging: continue to control the flash powder slurry at 50-70℃, pass nitrogen, and age for 1-3 hours under low-speed stirring; Washing: a, magnetic separation: use a strong magnet to absorb the flash powder particles 22 coated with Fe3O4 to the bottom of the container, and draw out the supernatant; b, deionized water washing: re-add deionized water to the container, stir, and repeat the magnetic separation for multiple times until the washing water is neutral; c, ethanol washing: wash multiple times with anhydrous ethanol; Drying: place the washed flash powder particles in a vacuum drying box for low-temperature vacuum drying at a temperature of 50-70℃.

[0011] In one of the embodiments, the dispersant is sodium hexametaphosphate, and the addition amount is 1.5-3.0% of the mass of the flash powder particles; in the preparation of the iron ion mixed solution, the concentration ratio is: FeCl3•6H2O solution: FeSO4•7H2O solution = 2:1.

[0012] In one of the embodiments, in the step of applying high pressure to charge the flash powder particles, the flash powder particles coated with the Fe3O4 magnetic field response layer enter the corona charging area from the storage bin, and then a voltage of 10-20Kv is applied to charge the flash powder particles coated with the Fe3O4 magnetic field response layer.

[0013] An acrylic product comprises the flash powder film.

[0014] Compared with the prior art, the flash powder film has the following beneficial effects: The flash powder film of the present application converges ambient light to the surface of the flash powder particles through the microlens, and the reflected light is amplified and scattered again through the microlens from the surface of the flash powder particles, forming a strong flash beam-like scattering, significantly improving the brightness and the visual appeal. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of a flash powder film according to an embodiment of the present application; Figure 2 FIG. 2 is a step flowchart of a flash powder film manufacturing method according to an embodiment of the present application.

[0016] The meanings of the reference numerals in the drawings are as follows: 100, flash powder film; 10, micro-optical functional layer; 11, base material layer; 12, microstructure layer; 20, reflective layer; 21, resin carrier layer; 22, flash powder particle; 30, protective layer; 31, wear-resistant layer; 32, oil-repellent layer; 40, adhesive layer; 50, release film. DETAILED DESCRIPTION

[0017] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using these specific details. In other instances, well-known methods have not been described in detail in order to avoid obscuring the present application. Therefore, the present application is not intended to be limited by the embodiments disclosed below, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0020] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Please refer to Figure 1 A glitter film 100 according to one embodiment of the invention includes a micro-optical functional layer 10, a reflective layer 20, a protective layer 30, an adhesive layer 40, and a release film 50. The micro-optical functional layer 10 includes a substrate layer 11 and a microstructure layer 12 connected to the substrate layer 11. The microstructure layer 12 is formed by imprinting multiple microlenses on a UV-curable resin. The reflective layer 20 includes a resin carrier layer 21 and multiple glitter particles 22. The resin carrier layer 21 is connected to the side of the microstructure layer 12 away from the substrate layer 11, and each of the glitter particles 22 is oriented on the resin carrier layer 21. The protective layer 30 is connected to the side of the substrate layer 11 away from the microstructure layer 12. One side of the adhesive layer 40 is connected to the side of the reflective layer 20 away from the substrate layer 11, and the other side is connected to the release film 50. In this embodiment, the glitter film 100 uses a microlens to focus ambient light onto the surface of the glitter particles 22. The reflected light is then amplified and scattered a second time from the surface of the glitter particles 22 by the microlens, forming a strong flash beam scattering, which significantly improves brightness, has a strong shimmering effect, and enhances visual appeal.

[0024] like Figure 1As shown, in this embodiment, the micro-optical functional layer 10 includes a substrate layer 11 and a microstructure layer 12 connected to the substrate layer 11. The microstructure layer 12 is formed by imprinting multiple microlenses on a UV-curable resin. Optionally, the multiple microlenses form a microlens array. The substrate layer 11 is an optical-grade PET film with a light transmittance greater than 92%, which is the prior art. In other embodiments, the substrate layer 11 is an optical-grade PVC film or PC film with high light transmittance. Further, the microlenses are hexagonal pyramidal microlenses. The reflective layer 20 includes a resin carrier layer 21 and a plurality of glitter particles 22. The resin carrier layer 21 is connected to the side of the microstructure layer 12 away from the substrate layer 11, and each of the glitter particles 22 is oriented on the resin carrier layer 21. Optionally, the resin carrier layer 21 is a weather-resistant PUA resin; the glitter particles 22 are flake-shaped aluminum powder, and further, the tilt angle of the glitter particles 22 is 30°-60°. Ambient light is focused onto the surface of the glitter particles 22 by a microlens. Under the specular reflection of the aluminum powder, the reflected light is amplified and scattered a second time through the microlens from the surface of the glitter particles 22, forming a strong flash beam scattering. Specifically, the first focusing (light collection): Ambient light is incident on the microlens array and focused onto a very small focal area on the reflective surface of the glitter particles 22. Directional reflection: Because the glitter particles 22 are oriented by a magnetic field (e.g., at a 42° tilt angle), the focal point is located exactly on the reflective surface of the glitter particles 22, which can directionally reflect the high-intensity light that has been focused back. Second scattering (magnification): The reflected light path basically returns along the incident light path and passes through the microlens for the second time. At this time, the microlens acts as a magnifying glass, dispersing the reflected light from the glitter particles 22 into a concentrated and bright light cone, forming a high-intensity, highly directional outgoing light cone. Not only does the brightness increase dramatically, but it also produces a strong dynamic flickering sensation of "one bright and one dark".

[0025] Please check again. Figure 1 The protective layer 30 is connected to the side of the substrate layer 11 away from the microstructure layer 12. Optionally, the protective layer 30 is a wear-resistant layer 31 and / or an oleophobic layer 32. Further, the wear-resistant layer 31 is a silica coating, and the oleophobic layer 32 is a fluorosiloxane coating. Even further, the contact angle of the oleophobic layer 32 is 100°-130°. In one embodiment, when the protective layer 30 is a wear-resistant layer 31 and an oleophobic layer 32, one side of the wear-resistant layer 31 is connected to the substrate layer 11, and the other side is connected to the oleophobic layer 32. The wear-resistant layer 31 improves wear resistance, and the oleophobic layer 32 provides fingerprint and stain resistance.

[0026] In one embodiment, one side of the adhesive layer 40 is connected to the side of the reflective layer 20 away from the substrate layer 11, and the other side is connected to the release film 50; optionally, the adhesive layer 40 is a fluorinated acrylate pressure-sensitive adhesive, which migrates to the surface of the adhesive layer 40 through fluorine segments to form a low-modulus interface layer, thereby reducing the curing temperature and avoiding thermal deformation of the acrylic substrate.

[0027] In use, after removing the release film 50, press the oleophobic layer 32 to bond the adhesive layer 40 to the acrylic substrate. Since the contact angle of the oleophobic layer 32 is 100°-130°, it automatically vents air during bonding, preventing air bubbles and improving yield. Then, it is cured by UV light, making the operation simple. Fluorine segments migrate to the surface of the adhesive layer 40, forming a low-modulus interface layer, lowering the curing temperature, protecting the acrylic substrate, preventing thermal deformation of the acrylic substrate, and reducing the curing energy consumption of the UV lamp. By using weather-resistant PUA resin, coating the adhesive layer 40 on the reflective layer 20, and connecting the protective layer 30 to the substrate layer 11, the glitter film 100 maintains its brilliant luster without fading, peeling, or discoloration during long-term use. Furthermore, when the glitter film 100 is bonded to a translucent background, it maintains its light-transmitting effect.

[0028] This glitter film 100 uses microlenses to focus ambient light onto the surface of glitter particles 22. The reflected light is then amplified and scattered a second time through the microlenses from the surface of the glitter particles 22, forming a strong flash beam scattering, which significantly improves brightness, has a strong shimmering effect, and enhances visual appeal.

[0029] like Figure 2 As shown, a method for manufacturing a glitter film 100, based on the aforementioned glitter film 100, includes the following steps: Microstructure imprinting: After the UV-curable resin is coated on the substrate layer 11, multiple microlenses are imprinted on the UV-curable resin under UV light irradiation and in conjunction with the imprinting roller to obtain the microstructure layer 12; Optionally, in the microstructure imprinting step, the temperature of the imprinting roller is 50℃-70℃.

[0030] Electrostatic implantation and magnetic field orientation of glitter particles 22: A resin carrier layer 21 with added UV stabilizer is coated on the side of the microstructure layer 12 away from the substrate layer 11. High voltage is applied to charge the glitter particles 22, and then electrostatic spraying is performed under the action of an alternating magnetic field to make each charged glitter particle 22 uniformly and oriented on the resin carrier layer 21. The resin carrier layer 21 is then cured by UV light to fix the tilt angle of the glitter particles 22. Through electrostatic adsorption, the glitter particles 22 are uniformly attached to the resin carrier layer 21. The tilt angle of each glitter particle 22 is controlled by the alternating magnetic field. During the electrostatic adsorption and magnetic field orientation process, the glitter particles 22 do not come into contact with the machinery, reducing the damage rate of the glitter particles 22. Optionally, when using a slot extrusion coating machine to coat the side of the microstructure layer 12 away from the substrate layer 11 with a resin carrier layer 21 containing a UV stabilizer, the length of the glitter particles 22 is 10μm-40μm, and the thickness of the resin carrier layer 21 is 60μm-100μm to ensure the embedding of the glitter particles 22. The temperature is 25℃-45℃, and the viscosity is 1000cp-1400cp. By controlling the temperature, a low viscosity is maintained to facilitate the insertion of the glitter particles 22.

[0031] Furthermore, before applying high voltage to charge the glitter particles 22, the glitter particles 22 need to be coated with an Fe3O4 magnetic field responsive layer, including the following steps: Preparation of glitter slurry: Glitter particles 22 are added to a mixed solution of deionized water and anhydrous ethanol, and then a dispersant is added and stirred to obtain a glitter slurry; optionally, the volume ratio of deionized water to anhydrous ethanol is 3-7:1, and the density of glitter particles 22 is 30-70 g / L; further, the dispersant is sodium hexametaphosphate, and the amount added is 1.5-3.0% of the mass of glitter particles 22. Sodium hexametaphosphate can effectively solve the problem of agglomeration and sedimentation of glitter particles 22 in the liquid system through charge repulsion and steric hindrance, and achieve uniform dispersion; specifically, after sodium hexametaphosphate dissolves in water, it dissociates into negatively charged phosphate ions, which are adsorbed on the surface of glitter particles 22, making them negatively charged. Through the mutual repulsion of like charges, agglomeration is broken, and charge repulsion is achieved; its long-chain molecular structure forms a protective film on the surface of glitter particles 22, physically blocking direct contact between particles. Even if the liquid is shaken or left to stand, sedimentation and re-agglomeration can be reduced, thus achieving steric hindrance.

[0032] Preparation of iron ion mixed solution: FeCl3•6H2O solution and FeSO4•7H2O solution are uniformly mixed in a molar ratio; optionally, the concentration ratio is FeCl•6H2O solution: FeSO4•7H2O solution = 2:1.

[0033] Adsorption of iron ions: Nitrogen gas is introduced into the glitter slurry, and the iron ion mixture is slowly added dropwise to the glitter slurry while the slurry is rapidly stirred, so that the iron ions are adsorbed on the surface of the glitter particles 22; optionally, under acidic conditions, the surface of the glitter particles 22 is negatively charged, attracting positively charged iron ions. Hydrated ions are used to achieve electrostatic adsorption; at the same time, the hydroxyl groups (-OH) on the surface of the glitter particles 22 form unstable surface coordination bonds with Fe ions, and the subsequent precipitation provides nucleation sites to achieve coordination adsorption.

[0034] Coprecipitation reaction: The glitter slurry, after iron ion adsorption, is kept at 50-70℃. Ammonia is added dropwise to the glitter slurry to adjust the pH to 10.1-11. Simultaneously, nitrogen gas is continuously bubbled into the glitter slurry to remove oxygen and prevent... Oxidized The following reaction occurs: Iron oxide (Fe3O4) was obtained, and the Fe3O4 coated the surface of the glitter particles 22 in the form of crystal nucleus growth. Thermal aging: Continue to control the glitter slurry at 50-70℃, introduce nitrogen gas, and age for 1-3 hours under low-speed stirring to make the Fe3O4 crystals grow more completely and the coating layer more dense and firm.

[0035] Cleaning: a) Magnetic separation: Use a strong magnet to attract the Fe3O4-coated glitter particles 22 to the bottom of the container and extract the supernatant; b) Deionized water washing: Add deionized water back into the container, stir, and repeat magnetic separation several times until the washing water is neutral; c) Ethanol washing: Wash several times with anhydrous ethanol; Ethanol can displace the water in the gaps between the particles, and its low surface tension and volatility prevent the particles from hard agglomerating during subsequent drying.

[0036] Drying: The cleaned glitter particles 22 are placed in a vacuum drying oven for low-temperature vacuum drying at 50-70℃ for 10-16 hours, with a vacuum degree of -0.3Mpa to -0.1Mpa. Low-temperature vacuum drying prevents the oxidation of Fe3O4 and avoids the agglomeration of glitter particles 22 caused by rapid evaporation of moisture; after drying, glitter particles 22 coated with an Fe3O4 magnetic field responsive layer are obtained.

[0037] Furthermore, in the step of applying high voltage to charge the glitter particles 22, the glitter particles 22 coated with the Fe3O4 magnetic field response layer enter the corona charging zone from the storage bin, and then a voltage of 10-20KV is applied to charge the glitter particles 22 coated with the Fe3O4 magnetic field response layer.

[0038] Adhesive layer 40 lamination: Adhesive layer 40 is laminated onto the cured resin carrier layer 21; optionally, adhesive layer 40 has a release film 50; further, adhesive layer 40 is attached to the resin carrier layer 21 by dry lamination.

[0039] Protective layer 30 spraying: After the adhesive layer 40 is applied, a protective layer 30 is sprayed on the side of the substrate layer 11 away from the microstructure layer 12.

[0040] Rewinding and slitting: After the protective layer 30 is applied, rewind and slitting is performed.

[0041] The manufacturing method of this glitter film 100 is simple and easy to control. Microlenses are obtained through UV transfer, and glitter particles 22 are oriented onto the resin carrier layer 21 through electrostatic implantation and magnetic field orientation. This simplifies the production process, ensures the consistency and stability of the decorative effect, and reduces production costs and process difficulty. Moreover, it can handle fine powders of 5-30μm, while the mixing and stirring method can only handle particles larger than 30μm, otherwise they are prone to agglomeration. Furthermore, by using a multi-segment gravure coating machine, the microstructure imprinting, coating of the resin carrier layer 21, electrostatic adsorption and magnetic field orientation of glitter particles 22, lamination of the adhesive layer 40, and spraying of the protective layer 30 are completed sequentially in a single pass of the substrate layer 11, achieving high-speed continuous production. The tilt angle of the glitter particles 22 is controlled by the electric field strength and voltage, which can maintain the consistency of the tilt angle and achieve controllable angle reflection.

[0042] An acrylic product includes the aforementioned glitter film 100; in use, after removing the release film 50, the adhesive layer 40 is bonded to the acrylic substrate by pressing the oleophobic layer 32, making the operation simple.

[0043] This glitter film 100 uses microlenses to focus ambient light onto the surface of glitter particles 22. The reflected light is then amplified and scattered a second time through the microlenses from the surface of the glitter particles 22, forming a strong flash beam scattering, which significantly improves brightness, has a strong shimmering effect, and enhances visual appeal. The manufacturing method of this glitter film 100 is simple and easy to control. Microlenses are obtained through UV transfer, and the glitter particles 22 are oriented onto the resin carrier layer 21 through electrostatic implantation and magnetic field orientation.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A glitter film, characterized in that, The device comprises a micro-optical functional layer, a reflective layer, a protective layer, an adhesive layer, and a release film. The micro-optical functional layer includes a substrate layer and a microstructure layer connected to the substrate layer. The microstructure layer is formed by imprinting multiple microlenses onto a UV-curable resin. The reflective layer includes a resin carrier layer and multiple glitter particles. The resin carrier layer is connected to the side of the microstructure layer away from the substrate layer, and each of the glitter particles is oriented in the resin carrier layer. The protective layer is connected to the side of the substrate layer away from the microstructure layer. One side of the adhesive layer is connected to the side of the reflective layer away from the substrate layer, and the other side is connected to the release film.

2. The glitter film according to claim 1, characterized in that, The substrate layer is an optical-grade PET film; the microlens is a hexagonal pyramidal microlens; the resin carrier layer is a weather-resistant PUA resin; the glitter particles are flake-shaped aluminum powder; and the adhesive layer is a fluorinated modified acrylate pressure-sensitive adhesive.

3. The glitter film according to claim 1, characterized in that, The protective layer is a wear-resistant layer and / or an oleophobic layer; when the protective layer is a wear-resistant layer and an oleophobic layer, one side of the wear-resistant layer is connected to the substrate layer and the other side is connected to the oleophobic layer.

4. A method for producing glitter film, characterized in that, Based on the glitter film according to claim 1, the steps include: Microstructure imprinting: After the UV-curable resin is coated on the substrate layer, multiple microlenses are imprinted on the UV-curable resin under UV light irradiation and imprinting roller to obtain a microstructure layer. Electrostatic implantation and magnetic field orientation of glitter particles: A resin carrier layer with added UV stabilizer is coated on the side of the microstructure layer away from the substrate layer. The glitter particles are charged by applying high voltage, and then electrostatic spraying is performed under the action of an alternating magnetic field to make each charged glitter particle uniformly and orientedly arranged on the resin carrier layer. The resin carrier layer is then cured and shaped using UV light, thereby fixing the tilt angle of the glitter particles. Adhesive layer lamination: A lamination layer is applied to the cured resin carrier layer; Protective layer spraying: After the adhesive layer is applied, a protective layer is sprayed on the side of the substrate layer away from the microstructure layer.

5. The method for producing glitter film according to claim 4, characterized in that, In the microstructure imprinting step, the temperature of the imprinting roller is 50℃-70℃.

6. The method for producing glitter film according to claim 4, characterized in that, When a resin carrier layer with added UV stabilizer is coated on the side of the microstructure layer away from the substrate layer, the thickness of the resin carrier layer is 60μm-100μm, the temperature is 25℃-45℃, and the viscosity is 1000cp-1400cp.

7. The method for producing glitter film according to claim 4, characterized in that, Before applying high voltage to charge the glitter particles, the glitter particles need to be coated with an Fe3O4 magnetic field responsive layer, including the following steps: Preparation of glitter slurry: Add glitter particles to a mixed solution of deionized water and anhydrous ethanol, then add a dispersant and stir to obtain glitter slurry; Preparation of iron ion mixture: FeCl3•6H2O solution and FeSO4•7H2O solution were mixed at a molar ratio The mixture is prepared in a uniform ratio; Adsorption of iron ions: Nitrogen gas is introduced into the glitter slurry, and the iron ion mixture is slowly added dropwise to the glitter slurry while the glitter slurry is being stirred rapidly, so that the iron ions are adsorbed on the surface of the glitter particles. Coprecipitation reaction: The glitter slurry, after iron ion adsorption, is kept at 50-70℃. Ammonia is added dropwise to the glitter slurry to adjust the pH to 10.1-11. Simultaneously, nitrogen gas is continuously bubbled into the glitter slurry to remove oxygen and prevent... Oxidized to The following reaction occurs: Iron oxide (Fe3O4) is obtained, and the Fe3O4 is coated on the surface of the glitter particles in the form of crystal nucleation growth. Thermal aging: Continue to control the glitter slurry at 50-70℃, introduce nitrogen gas, and age for 1-3 hours with low-speed stirring; Cleaning: a) Magnetic separation: Use a strong magnet to attract the Fe3O4-coated glitter particles 22 to the bottom of the container and extract the supernatant; b) Deionized water washing: Add deionized water back into the container, stir, and repeat magnetic separation several times until the washing water is neutral; c) Ethanol washing: Wash several times with anhydrous ethanol. Drying: Place the cleaned glitter particles in a vacuum drying oven for low-temperature vacuum drying at a temperature of 50-70℃.

8. The method for producing glitter film according to claim 7, characterized in that, The dispersant is sodium hexametaphosphate, and the amount added is 1.5-3.0% of the mass of the glitter particles; when preparing the iron ion mixture, the concentration ratio is: FeCl3•6H2O solution: FeSO4•7H2O solution = 2:

1.

9. The method for producing glitter film according to claim 7, characterized in that, In the step of applying high voltage to charge the glitter particles, the glitter particles coated with the Fe3O4 magnetic field response layer enter the corona charging zone from the storage bin, and then a voltage of 10-20KV is applied to charge the glitter particles coated with the Fe3O4 magnetic field response layer.

10. An acrylic product, characterized in that, Includes the glitter film according to any one of claims 1-3.

Images