High-brightness white reflecting film structure

Abstract

The utility model provides a high-brightness white reflecting film structure, which comprises a white reflecting film, a bonding layer and a silver-plated film layer which are sequentially arranged from top to bottom, the bonding layer is a resin glue layer, the light transmittance of the resin glue layer is larger than 95%, the haze is smaller than 2%, the chromaticity b * is smaller than 0.3, and the chromaticity b * is smaller than 0.3. The light transmittance is greater than 90%, the haze is less than 5% and the chromaticity b * is less than 0.5 under the conditions of 80 DEG C and 500 hours, and the silver-plated film layer comprises a PET base material, an adhesion layer, a silver-plated layer and an aluminum-plated layer which are sequentially arranged from bottom to top, or comprises a PET base material, an adhesion layer, a silver-plated layer and an anti-oxidation layer which are sequentially arranged from bottom to top. Furthermore, first high-refractive-index particles are doped in the resin glue layer. A plurality of hexagonal honeycomb-shaped first bulges are formed on the upper surface of the resin glue layer.

Description

Technical Field

[0001] The utility model belongs to the technical field of reflective films, and particularly relates to a high-brightness white reflective film structure. Background Art

[0002] The backlight module is an important component of a liquid crystal display device. After the light source of the backlight module enters the light guide plate, the light source provides light upward to the LCD module, and the light enters the reflective sheet downward and then rebounds through the light guide plate and returns to the LCD module. Therefore, an important factor affecting its quality and performance in the backlight module is the light reflection utilization rate. The reflective film is an important component of the backlight module, which is used to enhance the light reflection effect and improve the brightness and energy efficiency of the backlight module.

[0003] Although the existing commonly used single-layer white reflective film can reflect most of the incident light, there is still a small part of the light that will pass through the reflective film and be lost, resulting in a low light reflection utilization rate and making it difficult to meet the brightness requirements. Summary of the Utility Model

[0004] The present utility model is made to solve the above technical problems, and aims to provide a high-brightness white reflective film structure.

[0005] To achieve the above object, the present utility model adopts the following technical solutions:

[0006] The present utility model provides a high-brightness white reflective film structure, which has the following characteristics: including a white reflective film, an adhesive layer, and a silver-plated film layer arranged in sequence from top to bottom. Among them, the adhesive layer is a resin glue layer, and the light transmittance of this resin glue layer under normal temperature conditions is greater than 95%, the haze is less than 2%, and the chromaticity b* is less than 0.3. Under the conditions of 80°C and 500 hours, the light transmittance is greater than 90%, the haze is less than 5%, and the chromaticity b* is less than 0.5. The silver-plated film layer includes a PET substrate, an adhesion layer, a silver-plated layer, and an aluminum-plated layer arranged in sequence from bottom to top, or a PET substrate, an adhesion layer, a silver-plated layer, and an antioxidant layer arranged in sequence from bottom to top.

[0007] In the high-brightness white reflective film structure provided by the present utility model, it may also have the following characteristics: among them, the resin glue layer is doped with first high-refractive-index particles.

[0008] In the high-brightness white reflective film structure provided by the present utility model, it may also have the following characteristics: among them, the particle size of the first high-refractive-index particles is 0.02 - 5 μm.

[0009] In the high-brightness white reflective film structure provided by the present utility model, it may also have the following characteristics: among them, the upper surface of the resin glue layer is formed with several first protrusions in a hexagonal honeycomb shape.

[0010] In the high-brightness white reflective film structure provided by the present utility model, it may further have the following characteristics: wherein, the resin glue layer is coated by a coating roller with a plurality of hexagonal honeycomb-shaped mesh holes on its outer surface. The mesh number of the mesh holes is 150 - 350 meshes, the width of the mesh wall is 5 - 10 μm, the width is 70 - 80 μm, and the depth is 20 - 30 μm.

[0011] In the high-brightness white reflective film structure provided by the present utility model, it may further have the following characteristics: wherein, the silver-plated film layer further includes a refractive coating provided on the upper surface of the antioxidant layer. The refractive coating is a resin coating composed of polyurethane acrylate resin and epoxy acrylate resin, and the resin coating is doped with second high refractive index particles.

[0012] In the high-brightness white reflective film structure provided by the present utility model, it may further have the following characteristics: wherein, the particle size of the second high refractive index particles is 0.02 - 5 μm.

[0013] In the high-brightness white reflective film structure provided by the present utility model, it may further have the following characteristics: wherein, the silver-plated film layer further includes a refractive coating provided on the upper surface of the antioxidant layer. The refractive coating is a resin coating composed of polyurethane acrylate resin and epoxy acrylate resin, and a plurality of hexagonal honeycomb-shaped second protrusions are formed on the upper surface of the resin coating.

[0014] In the high-brightness white reflective film structure provided by the present utility model, it may further have the following characteristics: wherein, the resin coating is coated by a coating roller with a plurality of hexagonal honeycomb-shaped mesh holes on its outer surface. The mesh number of the mesh holes is 150 - 350 meshes, the width of the mesh wall is 5 - 10 μm, the structural width is 70 - 80 μm, and the depth is 20 - 30 μm.

[0015] Functions and effects of the utility model

[0016] According to the high-brightness white reflective film structure involved in the utility model, because there are a white reflective film, an adhesive layer, and a silver-plated film layer arranged in sequence from top to bottom, the adhesive layer is a resin glue layer. The resin glue layer has a light transmittance greater than 95%, a haze less than 2%, and a chromaticity b* less than 0.3 under normal temperature conditions, and a light transmittance greater than 90%, a haze less than 5%, and a chromaticity b* less than 0.5 under the conditions of 80°C and 500 hours. It has high light transmission performance, enabling the white reflective film and the silver-plated film layer to be adhered through the resin glue layer to obtain a high-brightness reflective product, enhancing the reflection effect of light and greatly improving the brightness of the product. Description of the drawings

[0017] Figure 1 It is a schematic structural diagram of the high-brightness white reflective film structure in Embodiment 1 of the present utility model;

[0018] Figure 2It is a schematic structural diagram of the high-brightness white reflective film structure in the second embodiment of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the high-brightness white reflective film structure in the third variant embodiment of the present utility model; and

[0020] Figure 4 It is a schematic structural diagram of the high-brightness white reflective film structure in the fourth variant embodiment of the present utility model. Specific embodiments

[0021] The following will further illustrate the concept, specific structure and technical effects of the present utility model in conjunction with the accompanying drawings to fully understand the purpose, features and effects of the present utility model.

[0022] <Embodiment 1>

[0023] Figure 1 It is a schematic structural diagram of the high-brightness white reflective film structure in the first embodiment of the present utility model.

[0024] As Figure 1 shown, in the first embodiment, the high-brightness white reflective film 10 includes a white reflective film 11, an adhesive layer 12 and a silver-plated film layer 13 arranged in sequence from top to bottom.

[0025] The white reflective film 11 can be a white reflective film made of polyethylene terephthalate (PET) or PMMA, and its thickness ranges from 23 to 250 μm. In the first embodiment, the white reflective film 11 includes a white reflective film with scratch-resistant function, a white reflective film with low shrinkage rate, a white reflective film with a certain thermal conductivity, and a white reflective film with different foaming densities.

[0026] The silver-plated film layer 13 includes a PET substrate 131, an adhesion layer 132, a silver-plated layer 133 and an aluminum-plated layer 134 arranged in sequence from bottom to top.

[0027] The PET substrate 131 is a transparent PET substrate, and the thickness range can be 23 - 250 μm, the light transmittance requirement is greater than 90%, and the haze is less than 1.5%; the shrinkage rate requirement is that at 220 degrees for 30 minutes, MD is less than or equal to 2%, and TD is less than or equal to 0.5%; the PET substrate is corona-treated.

[0028] The thickness of the adhesion layer 132 is less than 2 μm, and its coating requires a light transmittance requirement of greater than 90% and a haze of less than 5%.

[0029] The thickness of the silver-plated layer 133 meets 20 - 50 nm, and the thickness of the aluminum-plated layer 134 is 20 - 50 nm; the reflectivity at 540 nm light is required to be greater than 94%, and the chromaticity b* is less than 1.

[0030] The adhesive layer 12 is a resin glue layer, which is composed of any one or more of acrylic resin, epoxy resin, and polyurethane resin. In the first embodiment, the performance of this resin glue was tested using ASTM D1003-2021 "Standard Test Method for Haze and Transmittance of Transparent Plastics". The test results were as follows: the transmittance was greater than 95%, the haze was less than 2%, and the chromaticity b* was less than 0.3 at room temperature; the transmittance was greater than 90%, the haze was less than 5%, and the chromaticity b* was less than 0.5 at 80°C for 500 hours.

[0031] In the first embodiment, the adhesive layer 12 is an acrylic resin layer, and its production process is as follows: the raw materials for preparation include 100 parts by weight of acrylate pressure-sensitive adhesive, 0.3 - 3.5 parts by weight of curing agent, and 40 - 150 parts by weight of organic solvent. Among them, the curing agent is one or a mixture of TDI, IPDI, MDI blocked isocyanate curing agent, HDI, and IPDI isocyanate curing agent, and the organic solvent is one or more of ethyl acetate, toluene, xylene, acetone, and methyl ethyl ketone. Slit coating is used, with a drying temperature of 120°C for 2 minutes; the coating thickness is 2 - 7μm, and the positive and negative tolerance of the coating thickness is required to be 0.5μm.

[0032] Function and effect of the first embodiment

[0033] According to the high-brightness white reflective film structure described in the first embodiment, because it has a white reflective film, an adhesive layer, and a silver-plated film layer arranged in sequence from top to bottom, the silver-plated film layer includes a PET substrate, an adhesion layer, a silver-plated layer, and an aluminized layer arranged in sequence from bottom to top, and the adhesive layer is a resin glue layer. The resin glue layer has a transmittance greater than 95%, a haze less than 2%, and a chromaticity b* less than 0.3 at room temperature; the transmittance is greater than 90%, the haze is less than 5%, and the chromaticity b* is less than 0.5 at 80°C for 500 hours. It has high light transmittance performance, enabling the white reflective film and the silver-plated film layer to be bonded through this resin glue layer to obtain a high-brightness reflective product, enhancing the light reflection effect and greatly improving the brightness of the product.

[0034] <Embodiment Two>

[0035] This second embodiment is a further improvement of the first embodiment. For the same components as in the first embodiment, the same reference symbols are given and the same descriptions are omitted.

[0036] Figure 2 It is a schematic structural diagram of the high-brightness white reflective film structure in the second embodiment of the present invention.

[0037] As Figure 2As shown, compared with the first embodiment, the difference in the second embodiment is that the silver plating layer 23 in the high-brightness white reflective film structure 20 includes a PET substrate 131, an adhesion layer 132, a silver plating layer 133, and an antioxidant layer 234 arranged in sequence from bottom to top.

[0038] In the second embodiment, the antioxidant layer 234 can effectively prevent the oxidation of the silver plating layer 133, and its thickness is 3 - 5 μm.

[0039] Function and Effect of the Second Embodiment

[0040] According to the high-brightness white reflective film structure involved in the second embodiment, because there are a white reflective film, an adhesive layer, and a silver plating layer arranged in sequence from top to bottom, the silver plating layer includes a PET substrate, an adhesion layer, a silver plating layer, and an antioxidant layer arranged in sequence from bottom to top, and the adhesive layer is a resin glue layer. The light transmittance of this resin glue layer under normal temperature conditions is greater than 95%, the haze is less than 2%, and the chromaticity b* is less than 0.3. Under the conditions of 80 °C and 500 hours, the light transmittance is greater than 90%, the haze is less than 5%, and the chromaticity b* is less than 0.5. It has high light transmittance performance, enabling the white reflective film and the silver plating layer to be adhered through this resin glue layer to obtain a high-brightness reflective product, enhancing the light reflection effect and greatly improving the brightness of the product.

[0041] <Variant Example 1>

[0042] This variant example 1 is a further improvement of the first embodiment and the second embodiment. For the same components as in the first and second embodiments, the same symbols are given and the same descriptions are omitted.

[0043] Compared with the first and second embodiments, the difference in this variant example 1 is that the adhesive layer 12 is a high refractive index particle resin glue layer, that is, the resin glue layer is doped with particles with a specific high refractive index.

[0044] In the first modification example, the adhesive layer 12 is an epoxy resin layer doped with specific high refractive index particles with a particle size of 0.02 - 5 μm. Its production process is as follows: The raw materials for preparation include 100 parts by weight of epoxy resin adhesive, 0.3 - 1.5 parts by weight of curing agent, 1 - 5 parts by weight of powder particles, 0.1 - 0.15 parts by weight of dispersant, and 40 - 150 parts by weight of organic solvent. Among them, the curing agent is one or a mixture of TDI, IPDI, MDI blocked isocyanate curing agent, HDI, and IPDI isocyanate curing agent. The powder particles are spherical or similar spherical bismuth pentoxide, niobium pentoxide, hollow spherical silica, and silica-coated liquid crystal particles. The particle size of the powder particles is between 20 nanometers and 5 micrometers, and it is required that the particle size of the powder after agglomeration does not exceed 5 micrometers. The dispersant is an acrylic copolymer or a silane coupling agent. The organic solvent is one or more of ethyl acetate, toluene, xylene, acetone, and methyl ethyl ketone. The powder is deagglomerated before use, ground with zirconium beads of different particle sizes for 2 hours and then used. A low-viscosity resin is selected to mix with the powder and dispersed by grinding and ultrasonic oscillation. The dispersion time is not less than 8 hours. The filter device selects a melt-blown filter element, and the filter grade of the filter element shall not be lower than the particle size of the powder after agglomeration, and it is necessary to ensure that the powder content is not affected during the filtration process. Slit coating is used to ensure the flatness of the glue surface and ensure that the thickness tolerance is less than 0.5 micrometers.

[0045] In the first modification example, in addition to having the functions and effects of the first embodiment and the second embodiment, because the resin glue layer is doped with particles with a specific high refractive index, the light is refracted and the total reflection of the light is destroyed, so that the light reflection is uniform, and the brightness of the product is further improved.

[0046] <Modification Example Two>

[0047] This second modification example is a further improvement of the first embodiment and the second embodiment. For the same constituent elements as in the first embodiment and the second embodiment, the same reference symbols are given and the same descriptions are omitted.

[0048] Compared with the first embodiment and the second embodiment, the difference in this second modification example is that several hexagonal honeycomb-shaped protrusions are formed on the upper surface of the resin glue layer as the bonding layer 12.

[0049] In the second modification example, the adhesive layer 12 is a polyurethane resin adhesive layer with a number of hexagonal honeycomb-shaped protrusions formed on its upper surface. Its production process is as follows: The raw materials for preparation include 100 parts by weight of polyurethane adhesive, 5 - 10 parts by weight of curing agent, 0.1 - 0.3 leveling agent, and 50 - 150 parts by weight of organic solvent; among them, the curing agent is one or a mixture of TDI, IPDI, MDI blocked isocyanate curing agent, HDI, and IPDI isocyanate curing agent, the leveling agent can be selected from polyvinyl alcohol (PVA), polysiloxane, and the organic solvent is one or more of ethyl acetate, toluene, xylene, acetone, and methyl ethyl ketone. It is coated using a coating roller with a number of hexagonal honeycomb-shaped mesh holes on its outer surface. The mesh number of the mesh holes is 150 - 350 meshes, the mesh wall width is 5 - 10 μm, the structure width is 70 - 80 μm, and the depth is 20 - 30 μm; in the second modification example, the mesh number of the coating roller is 300 meshes, the mesh wall width is 8 μm, the hexagonal structure width is 76 μm, and the hexagonal depth is 23 μm; the gluing method is forward coating.

[0050] In the second modification example, in addition to having the functions and effects of the first embodiment and the second embodiment, because hexagonal honeycomb-shaped protrusions are formed on the upper surface of the resin glue layer, the protrusions can break the total reflection of incident light and enable the light to be reflected at different angles, thereby making the reflected light uniform and further improving the brightness of the product.

[0051] <Modification Example Three>

[0052] This modification example three is a further improvement of the first embodiment, the second embodiment, the first modification example, and the second modification example. For the same constituent elements as those in the first embodiment, the second embodiment, the first modification example, and the second modification example, the same reference symbols are given and the same descriptions are omitted.

[0053] Figure 3 It is a schematic structural diagram of the high-brightness white reflective film structure in the third modification example of the present utility model. Figure 3 Only the improvements made on the basis of the first embodiment are shown.

[0054] As Figure 3 shown, compared with the first embodiment, the second embodiment, the first modification example, and the second modification example, the difference in this modification example three is that the silver-plated film layer 33 in the high-brightness white reflective film structure 30 further includes a refractive coating 335 provided on the upper surface of the antioxidant layer 134.

[0055] In the third modification example, the refraction coating 335 is a resin coating composed of polyurethane acrylate resin and epoxy acrylate resin, and high refractive index particles are incorporated in the resin coating. The production process uses 18 - 49 parts of polyurethane acrylate resin; 12 - 37 parts of epoxy acrylate resin; 0.3 - 3 parts of photoinitiator, and the photoinitiator is one of 1 - hydroxy - cyclohexyl benzophenone or 2,4,6 - trimethylbenzoyl - diphenylphosphine oxide; 0.5 - 1 part of dispersant; 2 - 4 parts of the particle material by mass ratio, covering two of spherical alumina, hollow silica, spherical titanium dioxide, and spherical niobium pentoxide, with particle sizes of 20 - 50 nm and 100 nm - 1 μm respectively, and 40 - 70 parts of solvent; the solvent is at least one of ethyl acetate, butyl acetate, toluene, xylene, propylene glycol methyl ether, dipropylene glycol methyl ether, acetone, butanone, cyclohexanone, methyl isobutyl ketone, isopropanol, and isobutanol.

[0056] In the third modification example, in addition to having the functions and effects of the first embodiment, the second embodiment, the first modification example, and the second modification example, since a refraction coating is further provided on the upper surface of the aluminized film, and this refraction coating is a resin coating doped with high - refractive - index particles, it causes light to refract and destroys the total reflection of light, thereby making the light reflection uniform and further improving the brightness of the product.

[0057] <Fourth Modification Example>

[0058] The fourth modification example is a further improvement of the second embodiment and the first modification example. For the same components as those in the second embodiment and the first modification example, the same reference signs are given and the same descriptions are omitted.

[0059] Figure 4 It is a schematic structural diagram of the high - brightness white reflective film structure in the fourth modification example of the present utility model.

[0060] As Figure 4 shown, compared with the second embodiment and the first modification example, the difference in the fourth modification example is that the silver - plated film layer 43 in the high - brightness white reflective film structure 40 further includes a refraction coating 435 provided on the upper surface of the antioxidant layer 234, and a number of hexagonal honeycomb - shaped protrusions are formed on the upper surface of the refraction coating 435.

[0061] In the fourth modification example, the refraction coating 435 is a resin coating of polyurethane acrylate resin and epoxy acrylate resin, and its production process is as follows: 20-50 parts of polyurethane acrylate resin, 50-80 parts of epoxy acrylate resin, and 0.3-3 parts of photoinitiator are used. Among them, the photoinitiator is one of 1-hydroxy-cyclohexyl benzophenone or 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. It is coated using a coating roller with several hexagonal honeycomb-shaped cavities on its outer surface. The mesh number of the cavities is 150-350 meshes, the mesh wall width is 5-10 μm, the structure width is 70-80 μm, and the depth is 20-30 μm; in the fourth modification example, the mesh number of the coating roller is 300 meshes, the mesh wall width is 8 μm, the hexagonal structure width is 76 μm, and the hexagonal depth is 23 μm; ultraviolet light curing is used, and the irradiation energy is 700-1100 mJ / cm 2 .

[0062] In the fourth modification example, in addition to having the functions and effects of the second embodiment and the first modification example, since a refraction coating is further provided on the upper surface of the aluminized film, and several hexagonal honeycomb-shaped protrusions are formed on the upper surface of the refraction coating, the reflected light is made more uniform, further improving the brightness of the product.

[0063] The above embodiments are preferred cases of the present invention and are not used to limit the protection scope of the present invention.

Claims

1. A high brightness white reflective film structure, characterized in that: include: The white reflective film, adhesive layer and silver-plated film layer are arranged in sequence from top to bottom. The bonding layer is a resin glue layer, the light transmittance of the resin glue layer at room temperature is greater than 95%, the haze is less than 2%, and the chromaticity b* is less than 0.3, and the light transmittance of the resin glue layer at 80°C and 500 hours is greater than 90%, the haze is less than 5%, and the chromaticity b* is less than 0.5, The silver-plated film layer comprises a PET substrate, an adhesion layer, a silver-plated layer and an aluminum-plated layer arranged in sequence from bottom to top, or a PET substrate, an adhesion layer, a silver-plated layer and an anti-oxidation layer arranged in sequence from bottom to top.

2. The high-brightness white reflective film structure according to claim 1, characterized in that: in, A plurality of first protrusions in a hexagonal honeycomb shape are formed on the upper surface of the resin glue layer.

3. The high brightness white reflective film structure according to claim 2, characterized in that: in, The resin glue layer is coated by a coating roller having a plurality of hexagonal honeycomb cells on the outer surface. The mesh number of the cells is 150-350 meshes, the mesh wall width is 5-10 μm, the width is 70-80 μm, and the depth is 20-30 μm.

4. The high brightness white reflective film structure according to claim 1, characterized in that: in, The silver-plated film layer further comprises a refractive coating disposed on the upper surface of the anti-oxidation layer, wherein the upper surface of the refractive coating is formed with a plurality of hexagonal honeycomb-shaped second protrusions. The refractive coating is coated by a coating roller having a plurality of hexagonal honeycomb cells on the outer surface. The mesh number of the cells is 150-350 meshes, the mesh wall width is 5-10 μm, the structure width is 70-80 μm, and the depth is 20-30 μm.

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