Light control film and preparation method thereof

Abstract

The invention belongs to the technical field of optical films, and particularly relates to a light control film and a preparation method thereof.The light control film comprises a PET protective film layer, a wear-resistant layer, a peep-proof film layer, a light-transmitting film layer and a release film layer, the PET protective film layer, the wear-resistant layer, the peep-proof film layer, the light-transmitting film layer and the release film layer are sequentially arranged from top to bottom, and the peep-proof film layer and the light-transmitting film layer are sequentially and alternately arranged to form a shutter structure. The black and transparent micro shutter structure with a rectangular structure can be prepared in the peep-proof layer, so that light is shielded and transmitted, and the peep-proof function is realized. A direct coating process is adopted, so that the light transmittance is increased. The peep-proof layer prepared by the invention has wear resistance, the wear-resistant layer comprises silicon dioxide and polyurethane, silicon dioxide has high hardness and high refractive index, polyurethane has good wear resistance and corrosion resistance, and the peep-proof layer has a protective effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical films, and in particular relates to a light control film and a preparation method thereof. Background Art

[0002] With the advancement of electronic communication technology and the increasing attention of users to privacy and security, more and more smartphone users choose to use mobile phone films with anti-peeping function to ensure the safety of the screen. Anti-peeping film can be used to protect the privacy of users and prevent them from being peeped by others. Among the existing anti-peeping films, there are usually two types: mirror film and frosted film. The mirror film has high reflectivity, making the screen brighter, but its wear resistance is poor and it is easy to leave traces of use. As the wear deepens, it may also cause the internal functional layer to be damaged and fall off, causing the anti-peeping function to fail. Although the frosted film has stronger wear resistance, its light transmittance is poor. Summary of the invention

[0003] The object of the present invention is to provide a light control film and a preparation method thereof, aiming to solve the technical problems in the prior art that the light control film has poor wear resistance, easily causes failure of the anti-peeping function, and has poor light transmittance.

[0004] To achieve the above-mentioned purpose, the light control film provided by an embodiment of the present invention includes a PET protective film layer, a wear-resistant layer, an anti-peep film layer, a light-transmitting film layer and a release film layer. The PET protective film layer, the wear-resistant layer, the anti-peep film layer, the light-transmitting film layer and the release film layer are arranged in sequence from top to bottom, and the anti-peep film layer and the light-transmitting film layer are alternately formed in sequence to form a shutter structure.

[0005] As an optional solution of the present invention, the anti-peep film layer is made by mixing UV transparent optical glue and UV black glue, and then irradiated by UV light curing equipment to alternate with the light-transmitting film layer to form the shutter structure;

[0006] Wherein, the UV transparent optical glue is composed of 50-60 parts of polyurethane acrylate, 50-60 parts of epoxy acrylate, 40-50 parts of cyclic acrylate monomer, 30-40 parts of long-chain acrylate monomer, 5-8 parts of photoinitiator, 0.3-0.5 parts of leveling agent, and 0.3-0.5 parts of defoaming agent, by weight; the UV black glue is composed of 40-50 parts of polyurethane acrylate, 40-50 parts of polyester acrylate, 30-40 parts of cyclic acrylate monomer, 30-40 parts of long-chain acrylate monomer, 20-30 parts of black color paste, 5-8 parts of photoinitiator, 0.3-0.5 parts of leveling agent, and 0.3-0.5 parts of defoaming agent.

[0007] As an optional scheme of the present invention, the amino acrylate is composed of a mixture of polyurethane and acrylate compounds, and the components of the polyurethane and acrylate compounds include toluene diisocyanate, polyether diol, β-hydroxypropyl methacrylate, Sn4+ catalyst and hydroquinone; the epoxy acrylate is prepared by esterification of epoxy resin and acrylic acid, and the epoxy acrylate is bisphenol A epoxy acrylate or phenolic epoxy acrylate or epoxidized acrylate or modified epoxy acrylate; the cyclic acrylate monomer is any one or more of isobornyl acrylate and isobornyl methacrylate; the long-chain acrylate monomer is any one or more of lauryl acrylate, isobornyl acrylate and tetrahydrofurfuryl acrylate; the polyester acrylate includes polyester and acrylate monomers, and the acrylate monomer is one or more of methyl acrylate, ethyl acrylate and butyl acrylate.

[0008] As an optional scheme of the present invention, the photoinitiator is any one or more of trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, and benzophenone; the leveling agent is an acrylate leveling agent, and the acrylate leveling agent includes, by mass, 15-25% of butyl methacrylate, 10-20% of lauryl acrylate, 8-15% of hexafluorobutyl methacrylate, 3-5% of difluoroheptyl methacrylate, 2-5% of initiator C, and 45-60% of ethylene glycol ethyl ether acetate; the defoamer is a surfactant defoamer, a silicone oil defoamer, or a fatty acid salt defoamer.

[0009] As an optional solution of the present invention, the black color paste is composed of 30-40 parts of aniline black, 10-20 parts of polyurethane resin, 30-40 parts of dimethylformamide, and 4-5 parts of dispersant in parts by weight.

[0010] As an optional solution of the present invention, the wear-resistant layer includes silicon dioxide and polyurethane.

[0011] As an optional solution of the present invention, the light-transmitting film layer contains transparent filler particles, the transparent filler particles are glass powder or acrylic powder, and the particle size of the transparent filler particles is 5-15 μm; the light-transmitting film layer is made of a light-transmitting treatment material containing acrylic resin, photoinitiator and transparent filler particles through UV curing, and the thickness of the light-transmitting film layer is 30-40 μm. The surface of the light-transmitting film layer is provided with a light-transmitting area and a light-absorbing area, and the light-transmitting area and the light-absorbing area are provided with a plurality of light-transmitting areas and are alternately arranged, and the light-transmitting areas and the light-absorbing areas form a first optical structure.

[0012] As an optional solution of the present invention, the material ratio of the light-transmitting film layer is: 10-50% acrylate, 0.05-1.5% photoinitiator, 0.3-1.5% stabilizer, 0.8-3% curing agent, 0.1-1.5% defoamer, 10-30% diluent, 20-50% transparent filler particles, and 15-40% solvent.

[0013] As an optional scheme of the present invention, the acrylic resin is one or a mixture of two or more of methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate, and hydroxyethyl methacrylate; the photoinitiator is any one or more of trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, and benzophenone; the curing agent is one or a mixture of two or more of dicyclic amidine, hexahydrophthalic anhydride, phthalic anhydride, dimethyldiaminodiphenylmethane, and diacetone acrylamide; the stabilizer is hydroquinone; the diluent is one or a mixture of two or more of butanediol diglycidyl ether, resorcinol diglycidyl ether, butyl methacrylate, and ethylene glycol ethyl ether; the solvent is one or a mixture of two or more of propylene glycol methyl ether, isopropyl acetate, and acetone.

[0014] Based on the same inventive concept, the present application also provides a method for preparing a light control film, the method for preparing a light control film comprising the following steps:

[0015] S1. Preparation of UV transparent optical glue;

[0016] S11. The cyclic acrylate monomer and the long-chain acrylate monomer are mixed uniformly, the temperature is raised to 40-50 ° C, and the mixture is stirred uniformly, an initiator is added to the mixed solution, the reaction is carried out at a constant temperature, and the mixed solution is stirred to obtain a pre-dispersion;

[0017] S12. Add polyurethane acrylate to the pre-dispersion, heat to 40-50°C, stir evenly, add epoxy acrylate, continue to mix evenly, then add leveling agent and defoamer, continue to mix evenly, filter and remove iron, and obtain UV transparent optical glue;

[0018] S2. Prepare UV black glue;

[0019] S21. The acrylate polyester monomer and the acrylate monomer are mixed, the temperature is raised to 40-50 ° C, and after stirring, a dispersant is added thereto, and the mixture is continued to be mixed to obtain a color paste dispersion; aniline black is added to the color paste dispersion, and the mixture is continued to be stirred and mixed to obtain a black color paste;

[0020] S22. The cyclic acrylate monomer is heated to 40-50°C, stirred evenly, an initiator is added thereto, the mixture is mixed evenly, a long-chain acrylate monomer is added, the mixture is mixed evenly, and a black glue pre-dispersion is obtained;

[0021] S23. After adding one-third of black color paste to the black glue pre-dispersion, the temperature was raised to 40-50 ° C, stirred evenly, polyurethane acrylate was added, and continued to mix evenly, one-third of black color paste was added, stirred evenly, polyester acrylate was added, and continued to stir evenly, and the last one-third of black color paste was added. After continuing to mix evenly, a leveling agent and a defoamer were added, stirred evenly, and filtered to obtain UV black glue;

[0022] S3. Preparing an anti-peep film layer;

[0023] Mixing UV transparent optical glue and UV black glue, and after irradiation with UV light, alternately forming a shutter structure with the light-transmitting film layer to obtain an anti-peep film layer;

[0024] S4. Stir and mix acrylate, photoinitiator, stabilizer, curing agent, defoaming agent, diluent, transparent filler particles and solvent according to a proportion to obtain a polyacrylate coating; after covering the upper surface of the wear-resistant layer with a PET protective film layer, fit the lower surface of the wear-resistant layer with the upper surface of the anti-peep layer, and then cure the polyacrylate coating to form a light-transmitting film layer, bond the light-transmitting film layer to the anti-peep film layer with an adhesive, and then cover it with a release film layer, and roll it up to obtain a light-control film.

[0025] The above one or more technical solutions of the light control film and the preparation method thereof provided by the embodiments of the present invention have at least one of the following technical effects:

[0026] 1. The present invention uses polyurethane acrylate as a raw material to prepare an anti-peeping structure of an anti-peeping layer, and a black and transparent micro-louver structure with a rectangular structure can be prepared in the anti-peeping layer, thereby blocking and transmitting light, and realizing an anti-peeping function;

[0027] 2. In order to further improve the light transmittance of the privacy film, the present invention adopts a direct coating process, which reduces the addition and use of the PET base film in the conventional process, reduces the cost, and increases the light transmittance;

[0028] 3. The anti-peeping layer prepared by the present invention has wear-resistant performance. The wear-resistant layer includes silicon dioxide and polyurethane. Silicon dioxide has high hardness and high refractive index, and polyurethane has good wear resistance and corrosion resistance and has a protective effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic structural diagram of a light control film provided in an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 1. PET protective film layer; 2. Wear-resistant layer; 3. Anti-peep film layer; 4. Light-transmitting film layer; 5. Release film layer.

[0033] 41. Light-transmitting area; 42. Light-absorbing area. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0038] In one embodiment of the present invention, Figure 1 As shown, a light control film is provided, including a PET protective film layer 1, a wear-resistant layer 2, an anti-peep film layer 3, a light-transmitting film layer 4 and a release film layer 5. The PET protective film layer 1, the wear-resistant layer 2, the anti-peep film layer 3, the light-transmitting film layer 4 and the release film layer 5 are arranged in sequence from top to bottom, and the anti-peep film layer 3 and the light-transmitting film layer 4 are alternately formed in sequence to form a louver structure. The present invention uses polyurethane acrylate as a raw material to prepare the anti-peep structure of the anti-peep layer. In the anti-peep layer, a black and transparent micro-louver structure with a rectangular structure can be prepared, thereby blocking and transmitting light to achieve an anti-peep function. In order to further improve the transmittance of the anti-peep film, the present invention adopts a direct coating process, which reduces the addition and use of the PET base film in the conventional process, reduces the cost, and increases the transmittance. The anti-peep layer prepared by the present invention has wear resistance, and the wear-resistant layer 2 includes silica and polyurethane, silica has high hardness and high refractive index, and polyurethane has good wear resistance and corrosion resistance, and has a protective effect.

[0039] In another embodiment of the present invention, the anti-peep film layer 3 is made by mixing UV transparent optical glue and UV black glue, and then irradiated by UV light curing equipment and then alternately formed with the light-transmitting film layer 4 to form a shutter structure;

[0040] Among them, by weight, the UV transparent optical glue is composed of 55 parts of polyurethane acrylate, 50 parts of epoxy acrylate, 45 parts of cyclic acrylate monomer, 35 parts of long-chain acrylate monomer, 6 parts of photoinitiator, 0.4 part of leveling agent, and 0.4 part of defoaming agent; the UV black glue is composed of 45 parts of polyurethane acrylate, 45 parts of polyester acrylate, 35 parts of cyclic acrylate monomer, 35 parts of long-chain acrylate monomer, 25 parts of black color paste, 6 parts of photoinitiator, 0.4 part of leveling agent, and 0.4 part of defoaming agent.

[0041] In another embodiment of the present invention, the amino acrylate is composed of a mixture of polyurethane and acrylate compounds, and the components of the polyurethane and acrylate compounds include toluene diisocyanate, polyether diol, β-hydroxypropyl methacrylate, Sn4+ catalyst and hydroquinone; the epoxy acrylate is prepared by esterification of epoxy resin and acrylic acid, and the epoxy acrylate is bisphenol A epoxy acrylate or phenolic epoxy acrylate or epoxidized acrylate or modified epoxy acrylate; the cyclic acrylate monomer is any one or more of isobornyl acrylate and isobornyl methacrylate; the long-chain acrylate monomer is any one or more of lauryl acrylate, isobornyl acrylate and tetrahydrofurfuryl acrylate; the polyester acrylate includes polyester and acrylate monomers, and the acrylate monomer is one or more of methyl acrylate, ethyl acrylate and butyl acrylate.

[0042] In another embodiment of the present invention, the photoinitiator is any one or more of trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, and benzophenone; the leveling agent is an acrylate leveling agent, and the acrylate leveling agent includes, by mass, 20% of butyl methacrylate, 15% of lauryl acrylate, 10% of hexafluorobutyl methacrylate, 5% of difluoroheptyl methacrylate, 5% of initiator C, and 45% of ethylene glycol ethyl ether acetate; the defoamer is a surfactant defoamer, a silicone oil defoamer, or a fatty acid salt defoamer.

[0043] In another embodiment of the present invention, the black color paste consists of 35 parts of aniline black, 15 parts of polyurethane resin, 35 parts of dimethylformamide, and 5 parts of dispersant, by weight.

[0044] In another embodiment of the present invention, the wear-resistant layer 2 comprises silicon dioxide and polyurethane.

[0045] In another embodiment of the present invention, the light-transmitting film layer 4 contains transparent filler particles, the transparent filler particles are glass powder or acrylic powder, and the particle size of the transparent filler particles is 10 μm; the light-transmitting film layer 4 is made of a light-transmitting treatment material containing acrylic resin, a photoinitiator and transparent filler particles through UV curing, and the thickness of the light-transmitting film layer 4 is 35 μm. The surface of the light-transmitting film layer 4 is provided with a light-transmitting area and a light-absorbing area, and a plurality of light-transmitting areas and light-absorbing areas are provided and alternately arranged, and the light-transmitting areas and light-absorbing areas form a first optical structure. The first optical structure has an anti-peeping effect, specifically as follows: the light-absorbing area 42 of the light-transmitting film layer 4 absorbs light and limits the passage of light, and the light passes through the light-transmitting area 41, thereby forming an anti-peeping structure with an anti-peeping effect.

[0046] In another embodiment of the present invention, the material ratio of the light-transmitting film layer 4 is: 20% acrylate, 1% photoinitiator, 1% stabilizer, 2% curing agent, 1% defoamer, 20% diluent, 25% transparent filler particles, and 30% solvent.

[0047] In another embodiment of the present invention, the acrylic resin is one or a mixture of two or more of methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate, and hydroxyethyl methacrylate; the photoinitiator is any one or more of trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, and benzophenone; the curing agent is one or a mixture of two or more of dicyclic amidine, hexahydrophthalic anhydride, phthalic anhydride, dimethyldiaminodiphenylmethane, and diacetone acrylamide; the stabilizer is hydroquinone; the diluent is one or a mixture of two or more of butanediol diglycidyl ether, resorcinol diglycidyl ether, butyl methacrylate, and ethylene glycol ethyl ether; the solvent is one or a mixture of two or more of propylene glycol methyl ether, isopropyl acetate, and acetone.

[0048] Based on the same inventive concept, the present application also provides a method for preparing a light control film, which comprises the following steps:

[0049] S1. Preparation of UV transparent optical glue;

[0050] S11. The cyclic acrylate monomer and the long-chain acrylate monomer are mixed uniformly, the temperature is raised to 45 ° C, and the mixture is stirred uniformly, an initiator is added to the mixed solution, the reaction is carried out at a constant temperature, and the mixed solution is stirred to obtain a pre-dispersion;

[0051] S12. Add polyurethane acrylate to the pre-dispersion, heat to 45°C, stir evenly, add epoxy acrylate, continue to mix evenly, then add leveling agent and defoamer, continue to mix evenly, filter and remove iron, and obtain UV transparent optical glue;

[0052] S2. Prepare UV black glue;

[0053] S21. The acrylate polyester monomer and the acrylate monomer are mixed, the temperature is raised to 45 ° C, and after stirring, a dispersant is added thereto, and the mixture is continued to be mixed to obtain a color paste dispersion; aniline black is added to the color paste dispersion, and the mixture is continued to be stirred and mixed to obtain a black color paste;

[0054] S22. The cyclic acrylate monomer is heated to 45°C, stirred evenly, an initiator is added thereto, the mixture is mixed evenly, a long-chain acrylate monomer is added, the mixture is mixed evenly, and a black glue pre-dispersion is obtained;

[0055] S23. After adding one-third of black color paste to the black glue pre-dispersion, the temperature was raised to 45 ° C, stirred evenly, polyurethane acrylate was added, and continued to mix evenly, one-third of black color paste was added, stirred evenly, polyester acrylate was added, and continued to stir evenly, and the last one-third of black color paste was added. After continuing to mix evenly, a leveling agent and a defoamer were added, stirred evenly, and filtered to obtain UV black glue;

[0056] S3. Preparing an anti-peep film layer 3;

[0057] Mix UV transparent optical glue and UV black glue, and after UV light irradiation, alternately form a shutter structure with the light-transmitting film layer 4 to obtain the anti-peep film layer 3;

[0058] S4. Stir and mix acrylate, photoinitiator, stabilizer, curing agent, defoaming agent, diluent, transparent filler particles and solvent according to a proportion to obtain a polyacrylate coating; after covering the upper surface of the wear-resistant layer 2 with the PET protective film layer 1, the lower surface of the wear-resistant layer 2 is bonded to the upper surface of the anti-peep layer, and then the polyacrylate coating is first cured to form a light-transmitting film layer 4, the light-transmitting film layer 4 is bonded to the anti-peep film layer 3 by an adhesive, and then covered with a release film layer 5, and rolled up to obtain a light-control film.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A light control film, characterized in that: It includes a PET protective film layer, a wear-resistant layer, an anti-peep film layer, a light-transmitting film layer and a release film layer. The PET protective film layer, the wear-resistant layer, the anti-peep film layer, the light-transmitting film layer and the release film layer are arranged in sequence from top to bottom, and the anti-peep film layer and the light-transmitting film layer are alternately formed in sequence to form a shutter structure.

2. The light control film according to claim 1, characterized in that: The anti-peep film layer is made by mixing UV transparent optical glue and UV black glue, and then irradiated by UV light curing equipment, and then alternately formed with the light-transmitting film layer to form the shutter structure; Wherein, the UV transparent optical glue is composed of 50-60 parts of polyurethane acrylate, 50-60 parts of epoxy acrylate, 40-50 parts of cyclic acrylate monomer, 30-40 parts of long-chain acrylate monomer, 5-8 parts of photoinitiator, 0.3-0.5 parts of leveling agent, and 0.3-0.5 parts of defoaming agent, by weight; the UV black glue is composed of 40-50 parts of polyurethane acrylate, 40-50 parts of polyester acrylate, 30-40 parts of cyclic acrylate monomer, 30-40 parts of long-chain acrylate monomer, 20-30 parts of black color paste, 5-8 parts of photoinitiator, 0.3-0.5 parts of leveling agent, and 0.3-0.5 parts of defoaming agent.

3. The light control film according to claim 2, characterized in that: The amino acrylate is composed of a mixture of polyurethane and acrylate compounds, and the components of the polyurethane and acrylate compounds include toluene diisocyanate, polyether diol, β-hydroxypropyl methacrylate, Sn4+ catalyst and hydroquinone; the epoxy acrylate is prepared by esterification of epoxy resin and acrylic acid, and the epoxy acrylate is bisphenol A epoxy acrylate or phenolic epoxy acrylate or epoxidized acrylate or modified epoxy acrylate; the cyclic acrylate monomer is any one or more of isobornyl acrylate and isobornyl methacrylate; the long-chain acrylate monomer is any one or more of lauryl acrylate, isobornyl acrylate and tetrahydrofurfuryl acrylate; the polyester acrylate includes polyester and acrylate monomers, and the acrylate monomer is one or more of methyl acrylate, ethyl acrylate and butyl acrylate.

4. The light control film according to claim 2, characterized in that: The photoinitiator is any one or more of trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, and benzophenone; the leveling agent is an acrylate leveling agent, which comprises, by mass, 15-25% of butyl methacrylate, 10-20% of lauryl acrylate, 8-15% of hexafluorobutyl methacrylate, 3-5% of difluoroheptyl methacrylate, 2-5% of initiator C, and 45-60% of ethylene glycol ethyl ether acetate; the defoamer is a surfactant defoamer, a silicone oil defoamer, or a fatty acid salt defoamer.

5. The light control film according to claim 2, characterized in that: In terms of weight, the black color paste is composed of 30-40 parts of aniline black, 10-20 parts of polyurethane resin, 30-40 parts of dimethylformamide, and 4-5 parts of dispersant.

6. The light control film according to claim 1, characterized in that: The wear-resistant layer includes silicon dioxide and polyurethane.

7. The light control film according to claim 1, characterized in that: The light-transmitting film layer contains transparent filler particles, which are glass powder or acrylic powder, and the particle size of the transparent filler particles is 5-15 μm; the light-transmitting film layer is made of a light-transmitting treatment material containing acrylic resin, a photoinitiator and transparent filler particles through UV curing, and the thickness of the light-transmitting film layer is 30-40 μm. The surface of the light-transmitting film layer is provided with a light-transmitting area and a light-absorbing area, and the light-transmitting area and the light-absorbing area are both provided with a plurality of light-transmitting areas and are alternately arranged, and the light-transmitting areas and the light-absorbing areas form a first optical structure.

8. The light control film according to claim 1, characterized in that: The material ratio of the light-transmitting film layer is: 10-50% acrylate, 0.05-1.5% photoinitiator, 0.3-1.5% stabilizer, 0.8-3% curing agent, 0.1-1.5% defoamer, 10-30% diluent, 20-50% transparent filler particles, and 15-40% solvent.

9. The light control film according to claim 8, characterized in that: The acrylic resin is one or a mixture of two or more selected from methyl methacrylate, ethyl methacrylate, hydroxymethyl methacrylate, and hydroxyethyl methacrylate; the photoinitiator is any one or more selected from trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, and benzophenone; the curing agent is one or a mixture of two or more selected from dicyclic amidine, hexahydrophthalic anhydride, phthalic anhydride, dimethyldiaminodiphenylmethane, and diacetone acrylamide; the stabilizer is hydroquinone; the diluent is one or a mixture of two or more selected from butanediol diglycidyl ether, resorcinol diglycidyl ether, butyl methacrylate, and ethylene glycol ethyl ether; and the solvent is one or a mixture of two or more selected from propylene glycol methyl ether, isopropyl acetate, and acetone.

10. A method for preparing a light control film, based on the light control film according to any one of claims 1 to 9, characterized in that: The light control film preparation method comprises the following steps: S1. Preparation of UV transparent optical glue; S11. The cyclic acrylate monomer and the long-chain acrylate monomer are mixed uniformly, the temperature is raised to 40-50 ° C, and the mixture is stirred uniformly, an initiator is added to the mixed solution, the reaction is carried out at a constant temperature, and the mixed solution is stirred to obtain a pre-dispersion; S12. Add polyurethane acrylate to the pre-dispersion, heat to 40-50°C, stir evenly, add epoxy acrylate, continue to mix evenly, then add leveling agent and defoamer, continue to mix evenly, filter and remove iron, and obtain UV transparent optical glue; S2. Prepare UV black glue; S21. The acrylate polyester monomer and the acrylate monomer are mixed, the temperature is raised to 40-50 ° C, and after stirring, a dispersant is added thereto, and the mixture is continued to be mixed to obtain a color paste dispersion; aniline black is added to the color paste dispersion, and the mixture is continued to be stirred and mixed to obtain a black color paste; S22. The cyclic acrylate monomer is heated to 40-50°C, stirred evenly, an initiator is added thereto, the mixture is mixed evenly, a long-chain acrylate monomer is added, the mixture is mixed evenly, and a black glue pre-dispersion is obtained; S23. After adding one-third of black color paste to the black glue pre-dispersion, the temperature was raised to 40-50 ° C, stirred evenly, polyurethane acrylate was added, and continued to mix evenly, one-third of black color paste was added, stirred evenly, polyester acrylate was added, and continued to stir evenly, and the last one-third of black color paste was added. After continuing to mix evenly, a leveling agent and a defoamer were added, stirred evenly, and filtered to obtain UV black glue; S3. Preparing an anti-peep film layer; Mixing UV transparent optical glue and UV black glue, and after irradiation with UV light, alternately forming a shutter structure with the light-transmitting film layer to obtain an anti-peep film layer; S4. Stir and mix acrylate, photoinitiator, stabilizer, curing agent, defoaming agent, diluent, transparent filler particles and solvent according to a proportion to obtain a polyacrylate coating; after covering the upper surface of the wear-resistant layer with a PET protective film layer, fit the lower surface of the wear-resistant layer with the upper surface of the anti-peep layer, and then cure the polyacrylate coating to form a light-transmitting film layer, bond the light-transmitting film layer to the anti-peep film layer with an adhesive, and then cover it with a release film layer, and roll it up to obtain a light-control film.

Images