High-brightness white reflective film

Abstract

The utility model provides a high-brightness white reflecting film, which comprises a white reflecting film, a bonding layer and an aluminum laminated film 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 greater than 95%, the haze is less than 2%, and the chromaticity b * is less than 0.3 under the condition of normal temperature. 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 particles with high refractive index are doped in the resin glue layer. And a plurality of hexagonal honeycomb-shaped bulges are formed on the upper surface of the resin glue layer. A refraction coating is further arranged on the upper surface of the aluminum laminated film, the refraction coating is a resin coating composed of polyurethane acrylic resin and epoxy acrylic resin, and high-refraction-rate particles are doped in the resin coating. A refraction coating is further arranged on the upper surface of the aluminum laminated film, the refraction coating is a resin coating composed of polyurethane acrylic resin and epoxy acrylic resin, and a plurality of hexagonal honeycomb-shaped protrusions are formed on the upper surface of the resin coating.

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. Background Art

[0002] The backlight module is an important component of liquid crystal display devices. 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 reflection utilization rate of light. The reflective film is an important component of the backlight module, which is used to enhance the reflection effect of light and improve the brightness and energy efficiency of the backlight module.

[0003] Although the commonly used existing 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 reflection utilization rate of light and making it difficult to meet the brightness requirements. Summary of the Utility Model

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

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

[0006] The utility model provides a high-brightness white reflective film, which has the following characteristics: including a white reflective film, an adhesive layer, and an aluminized film arranged in sequence from top to bottom. Among them, the adhesive layer is a resin glue layer, and the light transmittance of the 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.

[0007] In the high-brightness white reflective film provided by the utility model, it can 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 provided by the utility model, it can also have the following characteristics: among them, the particle size of the first high-refractive-index particles is 0.02 - 5μm.

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

[0010] In the high-brightness white reflective film provided by the present utility model, it may further have the following features: among them, the resin glue layer is coated by a coating roller with a number of hexagonal honeycomb-shaped mesh holes on its outer surface. The mesh count 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 provided by the present utility model, it may further have the following features: among them, a refractive coating is further provided on the upper surface of the aluminized film. 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 provided by the present utility model, it may further have the following features: among them, the particle size of the second high refractive index particles is 0.02 - 5 μm.

[0013] In the high-brightness white reflective film provided by the present utility model, it may further have the following features: among them, a refractive coating is further provided on the upper surface of the aluminized film. The refractive coating is a resin coating composed of polyurethane acrylate resin and epoxy acrylate resin, and a number of hexagonal honeycomb-shaped second protrusions are formed on the upper surface of the resin coating.

[0014] In the high-brightness white reflective film provided by the present utility model, it may further have the following features: among them, the resin coating is coated by a coating roller with a number of hexagonal honeycomb-shaped mesh holes on its outer surface. The mesh count 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 involved in the utility model, because it has a white reflective film, an adhesive layer, and an aluminized film 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 aluminized film to be bonded together through the resin glue layer to obtain a high-brightness reflective product, enhancing the light reflection effect and greatly improving the brightness of the product. Brief description of the drawings

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

[0018] Figure 2 is a schematic structural diagram of the high-brightness white reflective film in the third variant of the present utility model; and

[0019] Figure 3 It is a schematic structural view of the high-brightness white reflective film in the fourth variant embodiment of the present utility model. Specific embodiments

[0020] The concept, specific structure and technical effects of the present utility model will be further described below in conjunction with the drawings to fully understand the purpose, features and effects of the present utility model.

[0021] <Example>

[0022] Figure 1 It is a schematic structural view of the high-brightness white reflective film in the embodiment of the present utility model.

[0023] As Figure 1 shown, in this embodiment, the high-brightness white reflective film 10 includes a white reflective film 11, an adhesive layer 12 and an aluminized film 13 which are arranged in sequence from top to bottom.

[0024] 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 this 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.

[0025] The base material of the aluminized film 13 can be selected from polyethylene terephthalate (PET) PET film, olefin film, polyvinyl alcohol (PC) film, polyvinyl alcohol, etc., 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 at 220 °C for 30 min, MD is less than or equal to 3%, and TD is less than or equal to 1%. In this embodiment, the reflectivity of the aluminized film 13 at 550 nm light > 90%, and the chromaticity b* < 0.5.

[0026] The adhesive layer 12 is a resin glue layer, and is composed of any one or more of acrylic resin, epoxy resin and polyurethane resin. In this embodiment, the performance of this resin glue was tested using ASTM D1003-2021 "Standard Test Method for Haze and Light Transmittance of Transparent Plastics". The test results are: the light transmittance is greater than 95%, the haze is less than 2%, and the chromaticity b* is less than 0.3 under normal temperature conditions; 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 °C and 500 hours.

[0027] In this 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 an acrylate pressure-sensitive adhesive, 0.3 - 3.5 parts by weight of a curing agent, and 40 - 150 parts by weight of an organic solvent. Among them, the curing agent is one or a mixture of more than one 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 - 7 μm, and the positive and negative tolerance of the coating thickness is required to be 0.5 μm.

[0028] Functions and effects of the embodiment

[0029] Regarding the high-brightness white reflective film involved in the embodiment, since it has a white reflective film, an adhesive layer, and an aluminized film arranged in sequence from top to bottom, 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-transmitting performance, enabling the white reflective film and the aluminized film to be bonded through this resin glue layer to obtain a high-brightness reflective product, enhancing the reflection effect of light and greatly improving the brightness of the product.

[0030] <Variant Example 1>

[0031] This Variant Example 1 is a further improvement of the embodiment. For the same constituent elements as in the embodiment, the same symbols are given and the same descriptions are omitted.

[0032] Compared with this embodiment, the difference in this Variant Example 1 is that the bonding 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.

[0033] In the first modified 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 microns, and at the same time, it is necessary to ensure that the particle size of the agglomerated powder does not exceed 5 microns. 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 agglomerated powder, 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 at the same time ensure that the thickness tolerance is less than 0.5 microns.

[0034] In the first modified example, in addition to having the functions and effects of the 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.

[0035] <Modified Example Two>

[0036] This second modified example is a further improvement of the embodiment. The same reference numerals are given to the same constituent elements as in the embodiment, and the same description is omitted.

[0037] Compared with this embodiment, the difference in this second modified example is that a number of hexagonal honeycomb-shaped protrusions are formed on the upper surface of the resin glue layer as the bonding layer 12.

[0038] 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 cavities on its outer surface. The mesh number of the cavities 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; in the second modification example, the mesh number of the coating roller is 300 meshes, the width of the mesh wall is 8 μm, the width of the hexagonal structure is 76 μm, and the depth of the hexagonal is 23 μm; the gluing method is forward coating.

[0039] In the second modification example, in addition to having the functions and effects of the embodiment, because the upper surface of the resin glue layer is formed with hexagonal honeycomb-shaped protrusions, the protrusions can break the total reflection of incident light, enabling the light to be reflected at different angles, thereby making the reflected light uniform and further improving the brightness of the product.

[0040] <Modification Example Three>

[0041] This modification example three is a further improvement of the embodiment, modification example one, and modification example two. For the same constituent elements as in the embodiment, modification example one, and modification example two, the same reference signs are given and the same descriptions are omitted.

[0042] Figure 2 It is a schematic structural diagram of a high-brightness white reflective film in the third modification example of the present utility model.

[0043] As Figure 2 shown, compared with the embodiment, modification example one, and modification example two, the difference in this modification example three is that: a refractive coating 24 is further provided on the upper surface of the aluminized film 13 in the high-brightness white reflective film 20.

[0044] In the third modification example, the refractive coating 24 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, coating 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.

[0045] In the third modification example, in addition to having the functions and effects of the embodiment, the first modification example, and the second modification example, since a refractive coating is further provided on the upper surface of the aluminized film, and this refractive coating is a resin coating doped with high refractive index particles, the light is refracted to destroy the total reflection of the light, thereby making the light reflection uniform and further improving the brightness of the product.

[0046] <Fourth Modification Example>

[0047] The fourth modification example is a further improvement of the embodiment, the first modification example, and the second modification example. For the same constituent elements as those in the embodiment, the first modification example, and the second modification example, the same reference signs are given and the same description is omitted.

[0048] Figure 3 It is a schematic structural diagram of the high - brightness white reflective film in the fourth modification example of the present utility model.

[0049] As Figure 3 shown, compared with the embodiment, the first modification example, and the second modification example, the difference in the fourth modification example is that: a refractive coating 34 is further provided on the upper surface of the aluminized film 13 in the high - brightness white reflective film 30, and a number of hexagonal honeycomb - shaped protrusions are formed on the upper surface of the refractive coating 34.

[0050] In the fourth modification example, the refractive coating 34 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-diphenyl phosphine oxide. It is coated with a coating roller having a number of 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 .

[0051] In the fourth modification example, in addition to having the functions and effects of the embodiment, the first modification example and the second modification example, since a refractive coating is further provided on the upper surface of the aluminized film, and a number of hexagonal honeycomb-shaped protrusions are formed on the upper surface of the refractive coating, the reflected light is made more uniform, and the brightness of the product is further improved.

[0052] 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, characterized in that: include: The white reflective film, adhesive layer and aluminum film are arranged from top to bottom. Wherein, the bonding layer is a resin glue layer, which has a transmittance greater than 95%, a haze less than 2%, and a chromaticity b* less than 0.3 at room temperature, and a transmittance greater than 90%, a haze less than 5%, and a chromaticity b* less than 0.5 at 80°C and 500 hours.

2. The high brightness white reflective film 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 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 according to claim 1, characterized in that: in, The upper surface of the aluminum-plated film is also provided with a refractive coating, and 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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