Protective film for mobile phone screen

Abstract

The utility model discloses a mobile phone screen protective film, which comprises a base material layer, an anti-radiation layer and a low reflection layer which are sequentially laminated, the anti-radiation layer is of a layer structure comprising ferrite particles, and the particle size of the ferrite particles is 20-100nm. In order to solve the problems that the mobile phone screen anti-radiation technology is high in cost, materials are difficult to select, the visual sense of a user to the mobile phone screen is possibly poor, and the like, the mobile phone screen protection film is provided, the film is attached to the mobile phone screen through OCA, the anti-reflection technology is combined, radiation of the mobile phone screen to the user is reduced, and meanwhile the anti-radiation effect of the mobile phone screen is improved. The anti-reflection function is added, the situation that a user cannot clearly check content in a mobile phone due to screen reflection light is avoided, and the service life of the screen is prolonged while the mobile phone is not affected by the user due to the fact that the anti-pollution and anti-scratch layer is arranged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of protective film, and specifically relates to a mobile phone screen protective film. BACKGROUND

[0002] Mobile phone radiation is composed of electromagnetic waves emitted by a mobile phone, and these electromagnetic waves can be absorbed by a human body to affect the human body. Reflection light on a mobile phone screen can also cause user eye fatigue and discomfort, and in a strong light environment, light in sunlight can be reflected and refracted on the mobile phone screen, resulting in blurred and indistinguishable pictures, interfering with the brightness and contrast of screen display, and making it difficult to identify text and images. SUMMARY

[0003] The utility model discloses a mobile phone screen protective film which can reduce mobile phone radiation, improve the definition of a mobile phone screen and enhance the visual effect of a user.

[0004] To achieve the above object, the utility model provides the technical scheme as follows in one specific embodiment.

[0005] A mobile phone screen protective film includes a substrate layer, a radiation protection layer and a low reflection layer which are sequentially stacked, the radiation protection layer is a layer structure including ferrite particles, and the particle size of the ferrite particles is 20-100 nm.

[0006] In one or more embodiments of the utility model, the ferrite particles are one or more of iron oxide, ferroferric oxide, ferrous oxide, nickel ferrite oxide and cobalt ferrite oxide.

[0007] In one or more embodiments of the utility model, the thickness of the radiation protection layer is 3-5 microns.

[0008] In one or more embodiments of the utility model, the radiation protection layer is an acrylic resin layer including ferrite particles.

[0009] In one or more embodiments of the utility model, the low reflection layer is an acrylic resin layer including silica particles.

[0010] In one or more embodiments of the utility model, the particle size of the silica particles is 30-100 nm.

[0011] In one or more embodiments of the utility model, the low reflection layer is a layer structure formed by acrylic resin paint, and the refractive index of the acrylic resin paint is 1.3-1.4.

[0012] In one or more embodiments of the utility model, the thickness of the low reflection layer is 90-100 nm.

[0013] In one or more embodiments of the present application, the low reflection layer is provided with an AF layer on the side away from the anti-radiation layer, and the thickness of the AF layer is 10-15nm.

[0014] In one or more embodiments of the present application, the substrate layer is a PET substrate or a TAC substrate.

[0015] Compared with the prior art, the mobile phone screen protection film of the present application, after being attached to the mobile phone screen through OCA optical adhesive, reduces the radiation of the mobile phone screen to the user, increases the anti-reflection function, prevents the user from clearly viewing the content in the mobile phone due to screen reflection, and has an anti-fouling and scratch-resistant layer, which prolongs the service life of the screen without affecting the use of the mobile phone by the user. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0017] Figure 1 Figure 1 is a schematic view of the mobile phone screen protection film attached to the outer surface of the mobile phone screen in an embodiment of the present application.

[0018] Main figure mark explanation:

[0019] 1, mobile phone screen; 2, OCA optical adhesive layer; 3, substrate layer; 4, anti-radiation layer; 5, low reflection layer; 6, AF layer. DETAILED DESCRIPTION

[0020] In order to make the person skilled in the art better understand the technical solutions in the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0021] As shown in Figure 1 A specific embodiment of the present application provides a mobile phone screen protection film, which comprises a substrate layer 3, an anti-radiation layer 4, a low reflection layer 5 and an AF layer 6 arranged in sequence.

[0022] Further, the thickness of the substrate layer 3 can be selected from 23 μm, 38 μm, 50 μm, 100 μm or 125 μm, and the substrate layer 3 is a PET substrate or a TAC substrate. In order to better meet the user's needs, the substrate with a total light transmittance of 90% or more is preferred, and in order to ensure the good adhesion between the radiation protection layer 4 and the substrate, the surface of the substrate can be treated by corona treatment or plasma treatment in advance, or the surface of the substrate can be coated with a silane coupling agent, a surfactant and a pre-coating layer.

[0023] Further, the radiation protection layer 4 is an acrylic resin layer containing ferrite particles.

[0024] Specifically, the specific type of acrylic resin can be selected from epoxy acrylic resin and polyurethane acrylic resin. In actual application, in order to ensure that the coating has certain hardness and flexibility, different types and functional groups of resins can be mixed, and active diluents and various additives can be added. In addition, in order to ensure that the coating has a certain hardness, the thickness of the radiation protection layer 4 is 3-5 μm.

[0025] The ferrite particles are one or more of iron oxide, magnetite, ferrous oxide, nickel ferrite and cobalt ferrite. As a magnetic material, ferrite can absorb incident electromagnetic waves through effects such as self-polarization, hysteresis, loss, domain wall resonance and natural resonance. The addition of ferrite particles to the acrylic resin makes the acrylic resin have the property of preventing radiation, so that the radiation of the mobile phone screen 1 to the user can be reduced. In addition, the ferrite particles themselves have a certain refractive index, such as the refractive index of iron oxide is 3.01, which can improve the refractive index of the whole coating after being added to the resin, and can cooperate with the low reflection layer 5 to improve the effect of reducing the reflectivity. In addition, the ferrite particles such as iron oxide also have good transparency, which can ensure that the user's line of sight is not disturbed.

[0026] The addition ratio of the ferrite particles in the acrylic resin can be adjusted according to the actual needs. The mass ratio of the acrylic resin and the ferrite particles is preferably 100:1, 100:2 or 100:3. The higher the proportion of ferrite particles in the resin, the higher the anti-radiation ability of the resin in general. However, when the proportion is too high, the ferrite particles have a certain absorption capacity for ultraviolet light, which will lead to insufficient curing of the whole coating, and the UV curing energy needs to be further improved. On the other hand, too many ferrite particles will cause the haze of the whole coating to rise, and too small proportion will lead to the radiation protection effect not obvious.

[0027] Further, the particle size of the ferrite particles is 20-100 nm.

[0028] Specifically, too large a ferrite particle size leads to poor dispersibility: a suitable particle size helps to improve the dispersibility of the ferrite particles, and if the particle size is too large, the particles cannot be uniformly dispersed in the coating, resulting in reduced uniformity and stability of the coating; optical performance is reduced: for example, nano-iron oxide has good optical properties such as high chroma and high transparency due to its small size effect and quantum size effect, and if the particle size is too large, these optical properties will be affected, and the color and transparency of the coating may not be as expected; mechanical performance is weakened: for example, the high specific surface area and surface energy of nano-iron oxide provide good mechanical strength and wear resistance in the coating, and a larger particle size can weaken these mechanical properties, affecting the durability and impact resistance of the coating.

[0029] Further, the low reflection layer 5 is an acrylic resin layer including silica particles, and the thickness of the low reflection layer 5 is 90-100 nm, and the particle size of the silica particles is 30-100 nm.

[0030] Specifically, the low reflection layer 5 is formed by coating with an acrylic resin coating, and the refractive index of the acrylic resin coating is 1.3-1.4. The addition of silica particles in the acrylic resin can adjust the refractive index, so that the low reflection layer 5 has better antireflection effect, which helps users to see more clearly the content displayed on the mobile phone screen 1, thereby achieving the effect of increasing the transparency.

[0031] Further, the thickness of the AF layer 6 is 10-15 nm.

[0032] Specifically, the AF layer 6 is made by spraying a conventional product, and its main component is perfluoropolyether polymer. The AF layer 6 can better protect the mobile phone screen 1 and help users more easily remove stains on the mobile phone screen 1.

[0033] Example 1

[0034] The mobile phone screen protection film comprises a substrate layer, a radiation protection layer, a low reflection layer and an AF layer which are sequentially stacked. The substrate layer is a PET substrate with a thickness of 50 μm; the radiation protection layer is an acrylic resin layer added with nano-iron oxide particles with a thickness of 4 μm; the low reflection layer is an acrylic resin layer added with silica particles with a thickness of 100 nm; and the AF layer has a thickness of 15 nm.

[0035] In preparation, acrylic resin and nano iron oxide particles are mixed in a mass ratio of 100:1, uniformly coated on the PET substrate by means of wire bar coating, dried at 80°C, and then cured in air with UV curing energy controlled at about 400 mj. Subsequently, silica particles are added to the acrylic resin to prepare a low-reflection coating, the mass fraction of silica particles in the low-reflection coating is 10wt%, the refractive index of the low-reflection coating is 1.33, the low-reflection coating is uniformly coated on the radiation protection layer, dried at 80°C, and then cured in nitrogen with UV energy of 600 mj. AF liquid is sprayed on the low-reflection layer by spraying to form an AF layer.

[0036] Example 2

[0037] The mobile phone screen protection film comprises a substrate layer, a radiation protection layer, a low-reflection layer and an AF layer which are sequentially stacked. The substrate layer is a PET substrate with a thickness of 50μm; the radiation protection layer is an acrylic resin layer added with nano iron oxide particles with a thickness of 4μm; the low-reflection layer is an acrylic resin layer added with silica particles with a thickness of 100nm; and the AF layer has a thickness of 15nm.

[0038] In preparation, acrylic resin and nano iron oxide particles are mixed in a mass ratio of 100:1, uniformly coated on the PET substrate by means of wire bar coating, dried at 80°C, and then cured in air with UV curing energy controlled at about 400 mj. Subsequently, silica particles are added to the acrylic resin to prepare a low-reflection coating, the mass fraction of silica particles in the low-reflection coating is 10wt%, the refractive index of the low-reflection coating is 1.33, the low-reflection coating is uniformly coated on the radiation protection layer, dried at 80°C, and then cured in nitrogen with UV energy of 600 mj. AF liquid is sprayed on the low-reflection layer by spraying to form an AF layer.

[0039] Example 3

[0040] The mobile phone screen protection film comprises a substrate layer, a radiation protection layer, a low-reflection layer and an AF layer which are sequentially stacked. The substrate layer is a PET substrate with a thickness of 50μm; the radiation protection layer is an acrylic resin layer added with nano iron oxide particles with a thickness of 4μm; the low-reflection layer is an acrylic resin layer added with silica particles with a thickness of 100nm; and the AF layer has a thickness of 15nm.

[0041] In preparation, the acrylic resin and nano iron oxide particles are mixed in a mass ratio of 100:3, and are uniformly coated on the PET substrate by means of a wire bar coating, and after drying at 80 DEG C, the UV curing energy is controlled at about 400 mj, and curing is carried out in air. Subsequently, the silica particles are added to the acrylic resin to prepare a low-reflection coating, the mass fraction of the silica particles in the low-reflection coating is 10 wt%, and the refractive index of the low-reflection coating is 1.33, the low-reflection coating is uniformly coated on the radiation-proof layer, and after drying at 80 DEG C, nitrogen protection is carried out and light curing is carried out at a UV energy of 600 mj. The AF liquid is sprayed on the low-reflection layer by means of spraying to form an AF layer.

[0042] Comparative Example 1

[0043] The difference between the present comparative example and Example 1 is that the radiation-proof layer is an acrylic resin layer, and no nano iron oxide particles are added.

[0044] The mobile phone screen protection films in each example and comparative example are attached to the outer surface of the mobile phone screen by means of OCA optical adhesive, and performance testing is carried out under the condition that the mobile phone screen is bright and close to the mobile phone screen, and the test results are shown in Table 1.

[0045] Table 1 Performance test results

[0046]

[0047] The mobile phone radiation test value mainly refers to the specific absorption rate (SAR) value, and the electromagnetic radiation SAR limit value requirement of the mobile phone in the national standard GB 21288-2088 "Mobile communication terminal electromagnetic radiation exposure limit" is not greater than 2.0 W / kg. As can be seen from Table 1, compared with Comparative Example 1 which does not add nano iron oxide particles, the mobile phone screen protection films in Examples 1-3 have lower specific absorption rate, exhibit excellent radiation-proof function, and have low reflectivity and high total light transmittance, indicating that the mobile phone screen protection film of the present application can not only reduce the radiation of the mobile phone screen to the user, but also help to improve the clarity of the mobile phone screen and enhance the visual effect of the user.

[0048] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the examples should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0049] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A cell phone screen protection film, characterized by, The low reflection layer is an acrylic resin layer containing silica particles. The low reflection layer is a layer structure formed by acrylic resin paint, and the refractive index of the acrylic resin paint is 1.3-1.

4. The ferrite particles are one of iron oxide, ferroferric oxide, ferrous oxide, nickel ferrite oxide and cobalt ferrite oxide.

2. The mobile phone screen protection film according to claim 1, characterized in that, The thickness of the radiation protection layer is 3-5 μm.

3. The mobile phone screen protection film according to claim 1, wherein The radiation protection layer is an acrylic resin layer containing ferrite particles.

4. The mobile phone screen protection film according to claim 1, characterized in that, The particle size of the silica particles is 30-100 nm.

5. The mobile phone screen protection film according to claim 1, wherein The thickness of the low reflection layer is 90-100 nm.

6. The mobile phone screen protection film according to claim 1, wherein The low reflection layer is provided with an AF layer on the side away from the radiation protection layer, and the thickness of the AF layer is 10-15 nm.

7. The mobile phone screen protection film according to claim 1, wherein The substrate layer is a PET substrate or a TAC substrate.

8. The mobile phone screen protection film according to claim 1, wherein ​

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