TW202313513A - Protective structure for preventing detachment and preparation method thereof - Google Patents

Abstract

The protective structure provided by the present invention to avoid the separation of the film layer and the preparation method thereof is to add a filling layer between the two film layer to overcome the problem of peeling off the film layer, to improve the overall bonding of the film layer strength.

Description

Protective structure for preventing film detachment and preparation method thereof

The present invention is related to protective sticker products, in particular to a protective structure for preventing film detachment and a preparation method thereof.

According to conventional coating technology, there are traditionally mainly divided into liquid film forming method and vapor phase film forming method, among which, liquid film forming method includes acid etching method, solution deposition method, electroplating method, anodic oxidation method, sol-gel method, etc. Sol-Gel Method, LB film (Langmuir-Blodgett Technique) and Liquid Phase Epitaxy (LPE), vapor phase film formation methods include Chemical Vapor-phase Deposition (CVD) and Physical vapor deposition (Physical Vapor-phase Deposition, PVD) has been widely used in various fields.

For example, in a specific application, it is to coat the screen protector to increase certain specific functions. In order to stack an anti-glare optical film 11 and an anti-reflection anti-reflection film 12 on the glass substrate 10, they can reduce light reflection and avoid glare.

However, due to the deficiencies in the technology disclosed in the prior patent of this invention, its film stacking technology and light transmittance are still not ideal. 12 is directly added on the anti-glare optical film 11, but in order to make the anti-glare optical film 11 have the effect of reducing glare, the surface of the anti-glare optical film 11 must have an uneven structure, so that the anti-reflection anti-reflection film 12 is arranged on a On the uneven surface 13 , there is a gap P between the anti-reflection and anti-reflection film 12 and the anti-glare optical film 11 , which not only reduces the contact area, but also makes the bonding incomplete, as shown in FIG. 1 . As a result, the adhesion of the anti-reflection and anti-reflection film 12 on the anti-glare optical film 11 is not good, which easily causes cracking or peeling off of the coating.

Furthermore, due to the limitation of the traditional manufacturing process and the consideration of the manufacturing cost, even if the conventional screen protector is provided with an anti-reflective anti-reflection film, when the user watches the displayed image through the mobile phone covered with the screen protector, the screen protector still suffers from light penetration. The efficiency is not high, and may not be clear, or reduce the brightness performance. Therefore, the structure or process steps of the conventional screen protectors are still not perfect, and it is necessary to improve them.

The main purpose of the present invention is to provide a protective structure to prevent the detachment of the film layer, which is to make a second coating layer between the first coating layer and the third coating layer, so as to overcome the problem of peeling off the film layer in the prior art. Effectively improve the bonding strength between film layers.

The reason is that, in order to achieve the above object, the protection structure disclosed by the present invention to prevent the detachment of the film layer comprises a base material, a first coating layer, a rough surface, a second coating layer and a third coating layer, wherein the The first coating layer is arranged on the base material; the rough surface is formed on the side of the first coating layer opposite to the connection between the first coating layer and the base material by using etching technology, so that the first coating layer and the base material are connected to each other. The haze of the first coating layer is between 1%-35%; the second coating layer is filled in the concave part of the rough surface by vacuum sputtering technology, and forms a flat surface after curing; the third coating layer on the flat surface. Accordingly, the stability of the combination is effectively improved, and the effect of preventing the detachment of the film layers is achieved.

In one embodiment, the second coating layer and the third coating layer are composed of the same composition, which can improve the bonding relationship between the two, and indeed improve the efficacy.

In order to further improve the overall transmittance of the protective structure, the present invention is further provided with a fourth coating layer on the other side of the base material opposite to the connection between the base material and the first coating layer, so that light can pass through When the fourth coating layer produces secondary reflection, it will interfere with the original reflected light to reduce the reflected light and increase the light transmittance.

In one embodiment, the fourth coating layer and the second coating layer or the third coating layer are made of the same composition, and the composition is niobium pentoxide, and the second coating layer and, The third coating layer and the fourth coating layer have the same visible light reflectivity, wherein the reflectivity is between 0.5%-1%.

In one embodiment, the material of the substrate is glass.

In one embodiment, the material of the substrate is selected from any one of polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA) and polymer resin.

In addition, the present invention also discloses a method for preparing a protective structure that prevents the detachment of the film layer, which includes the following steps: a. Take a substrate; b. Form a first coating layer on the substrate, and apply the first coating layer layer is etched to form a rough surface; c. vacuum sputtering a second coating layer above the first coating layer, and after the second coating layer is filled in the concave portion of the rough surface, the second coating layer layer is cured for the first time to form a flat surface; d. sputtering with a target material of the same composition as the second coating layer to form a third coating layer above the flat surface, and then the third coating layer layer undergoes a second cure.

In one embodiment, the method further includes a step e of sputtering a target with the same composition as that of the second coating layer on a position below the substrate to form a fourth coating layer.

Wherein, the target material is niobium pentoxide, so that the second coating layer, the third coating layer and the fourth coating layer have the same visible light reflectivity, and the reflectivity is between 0.5%-1%.

First of all, the preparation method of the protective structure that prevents the detachment of the film layer provided in the preferred embodiment of the present invention is to add another filling layer between the two film layers with poor adhesion effect to overcome the conventional technology. The problem of peeling of the film layer can effectively improve the bonding strength of the film layer as a whole.

Please refer to shown in Fig. 3 to Fig. 5, this preparation method comprises the following steps:

a. Take a piece of base material 20 and process it through CNC cutting, strengthening, printing and other pre-processing procedures. Wherein, the material of the substrate 20 can be but not limited to glass or plastic, and the plastic is polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA) or polymer resin. In this example, the substrate 20 is made of glass, and its thickness is between 0.1 mm and 0.45 mm, preferably 0.33 mm.

b. forming a first coating layer 30 above the substrate 20, the thickness of which is between 0.1 μm and 5.0 μm, preferably 2.0 μm, and the first coating layer 30 is opposite to the first coating layer 30 and the substrate 20 are etched on one side of the connection to form a rough surface 31, the surface roughness (Ra) of which is approximately between 10 nm and 1000 nm, so that the first coating layer 30 The haze is between 1%-35%, which is an anti-glare film (Anti-glare, AG), which is used to suppress the reflection of external light sources. Among them, the etching process adopts sand blasting or wet etching, and the etchant used in wet etching is hydrochloric acid, nitric acid, sulfuric acid, citric acid, ascorbic acid, oxalic acid, acetic acid, hydrofluoric acid, ammonium fluoride, sodium fluoride, fluorine Potassium chloride, ammonium difluoride, sodium difluoride or potassium difluoride, etc.

c. Vacuum sputtering a second coating layer 40 above the first coating layer 30, and after the second coating layer 40 is filled in the concave portion of the rough surface 31, the second coating layer 40 is subjected to the first step solidified to form a flat surface 41 . Among them, the curing temperature is between 250°C and 400°C, and the curing time is about 15 to 90 minutes, and the heating temperature should be avoided from being too high or exceeding the glass transition temperature (glass transition temperature, Tg), which is prone to glass yellowing, etc. Problem arises. In addition, when the base material 20 is changed to plastic, etching, sputtering, and curing must be performed at a temperature lower than 150° C. (ie, the curing temperature is between 25° C. and 150° C.) to avoid cracking of the plastic. In addition, in this example, after the second coating layer 40 completely fills the concave portion of the rough surface 31, it is stacked with a predetermined thickness (for example, the stack thickness is between 0.1 μm and 2.0 μm) to completely cover the on the first coating layer 30 . In other embodiments, only the second coating layer 40 can completely fill up the concave portion of the rough surface 31 , which can also present a flat surface.

d. Carry out sputtering on the flat surface 41 to form a third coating layer 50, the thickness of which is between 0.1 μm and 5.0 μm, preferably 2 μm, so that there is no gap P between each film layer, namely It presents a closely bonded state, which ensures the stability of the combination and achieves the effect of preventing the detachment of the film layers. In this example, the third coating layer 50 is sputtered with a target having the same composition as that of the second coating layer 40 to improve the bonding relationship between the two. Furthermore, the composition of the target is niobium pentoxide (Nb2O5), so that the second coating layer 40 and the third coating layer 50 are anti-reflective coatings (Anti-reflective coating, AR) with the same visible light reflectance , and the reflectivity is between 0.5%-1%. Then, the third coating layer 50 is cured for the second time. Wherein, the curing temperature is between 80 to 500° C., and the curing time is about 15 to 90 minutes.

e. A protective layer 70 is covered on the third coating layer 50 . Wherein, the protective layer 70 has the characteristics of waterproof, hydrophobic and oil-resistant, when water or other liquids are splashed on the protective layer 70, water droplets will naturally form, and due to the factors of hydrophobic and oil-resistant, they will slide down along the way, and Resistant to pollutants such as fingerprints or oil, and easy to wipe clean.

f. Perform sputtering on the position below the substrate 20 to form a fourth coating layer 60 with a thickness of 2 μm. In this example, the fourth coating layer 60 is sputtered with a target having the same composition as that of the second coating layer 40, and the target is selected from calcium fluoride, magnesium fluoride, titanium oxide, lead sulfide, and lead selenide. Any one or a combination of the clusters formed, so that the second coating layer 40 and the fourth coating layer 60 are anti-reflective coatings (Anti-reflective coating, AR) with the same visible light reflectivity, and the reflectivity is between Between 0.5%-1%.

g. An adhesive layer 80 is disposed under the fourth coating layer 60 . Wherein, the adhesive layer 80 includes a composite adhesive composition such as acrylic or polyester.

h. Inspection and packing.

Then, continue referring to Fig. 3, in the concrete structure of this protective structure A, system comprises protective layer 70, the 3rd coating layer 50, the 2nd coating layer 40, the 1st coating layer 30, base material 20, the 2nd coating layer in sequence. Four coating layers 60 and glued layers 80, wherein, since the two sides of the substrate 20 are respectively provided with an anti-reflection layer (that is, the third coating layer 50 and the fourth coating layer 60), the penetration rate of the protective structure A It has been increased to 78%, which is a significant improvement compared with the conventional technology's penetration rate of only 70%.

Furthermore, the protective structure A provided by the present invention is used to be pasted on an electronic device, in addition to being used for protection, it can also prevent the glare effect and increase the light transmittance. Wherein, the electronic device may be, but not limited to, a notebook computer, a personal desktop computer, a tablet computer, a smart phone, a TV, a dashboard or other similar display devices. In this example, as shown in FIG. 2 , the protective structure A provided by the present invention is used to stick on the screen 91 of a mobile phone 90 .

In addition, in another embodiment, the second coating layer 40 and the third coating layer 50 can be formed by sputtering targets with different compositions, and the second coating layer 40 and the fourth coating layer Between 60 and 60 can also be sputtered with targets of different compositions. For example, the target material can be but not limited to calcium fluoride, magnesium fluoride, titanium oxide, lead sulfide, lead selenide, and the like.

To sum up, the protection structure and the preparation method provided by the present invention can not only effectively improve the bonding strength between each film layer, but also have a reliable and complete composite structure after long-term use, and it is not easy to crack or Peeling, moreover, can make the light transmittance have a better performance, and its effect is already remarkable, which should be in line with the invention called by the patent law.

10: Glass substrate 11:Anti-glare optical film 12: Anti-reflection AR coating 13: Non-flat surface P: space A: Protective structure 20: Substrate 30: The first coating layer 31: rough surface 40: Second coating layer 41: flat surface 50: The third coating layer 60: The fourth coating layer 70: protective layer 80: glued layer 90: mobile phone 91: screen

Fig. 1 is a sectional view of a conventional screen protector. Fig. 2 is a schematic diagram of a protective structure assembled on a mobile phone screen according to a preferred embodiment of the present invention. Fig. 3 is a cross-sectional view of a protective structure of a preferred embodiment of the present invention along section line 3-3 in Fig. 2 . FIG. 4 is a partially enlarged view of FIG. 3 in a preferred embodiment of the present invention. Fig. 5 is a flowchart of a preparation method of a preferred embodiment of the present invention.

20: Substrate

30: The first coating layer

31: rough surface

40: Second coating layer

41: flat surface

50: The third coating layer

70: protective layer

Claims (12)

A protective structure to prevent film detachment, which allows external visible light to penetrate, and includes: a substrate; a first coating layer, disposed on the substrate; A rough surface is formed on the side of the first coating layer opposite to the connection between the first coating layer and the substrate by etching technology, so that the haze of the first coating layer is between 1%. Between -35%; A second coating layer is used to fill the concave part of the rough surface by vacuum sputtering technology, and form a flat surface after curing; and A third coating layer is arranged on the flat surface. According to claim 1, the protective structure for preventing film layer detachment, wherein the second coating layer and the third coating layer are made of the same composition. The protective structure for avoiding detachment of the film layer as described in claim 1, which further includes a fourth coating layer, which is arranged on the other side of the substrate opposite to the connection between the substrate and the first coating layer, and The fourth coating layer is composed of the same composition as the second coating layer or the third coating layer. The protective structure for avoiding detachment of the film layer as described in claim 3, wherein the composition is niobium pentoxide, and the second coating layer, the third coating layer and the fourth coating layer have the same visible light reflectance, The reflectivity is between 0.5%-1%. The protective structure for avoiding detachment of the film layer according to claim 1, wherein the material of the substrate is glass. The protective structure for avoiding the detachment of the film layer as described in claim 1, wherein the material of the substrate is selected from polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA) and macromolecule Resin is any one of them. A method for preparing a protective structure for avoiding detachment of the film layer, comprising the following steps: a. Take a substrate; b. forming a first coating layer on the substrate, and etching the first coating layer to form a rough surface; c. Vacuum sputtering a second coating layer above the first coating layer, and after the second coating layer is filled in the concave part of the rough surface, the second coating layer is cured for the first time to form a flat surface; d. Forming a third coating layer above the flat surface, and then curing the third coating layer for the second time. The method for preparing a protective structure for avoiding detachment of film layers according to claim 7, wherein, in step d, the third coating layer is sputtered with a target having the same composition as that of the second coating layer. The method for preparing a protective structure that prevents the detachment of the film layer as described in claim 7, it further includes step e following the step d, and the step e is to use a target material with the same composition as the second coating layer on the substrate Sputtering is performed on the position below to form a fourth coating layer. The preparation method of the protective structure that prevents the detachment of the film layer as described in claim 9, wherein the target material is niobium pentoxide, so that the second coating layer, the third coating layer and the fourth coating layer have the same visible light reflectivity, and the reflectivity is between 0.5%-1%. The method for preparing a protective structure for avoiding detachment of the film layer according to claim 7, wherein the material of the substrate is glass. The preparation method of the protective structure that avoids the detachment of the film layer as described in claim item 7, wherein the material of the substrate is selected from polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA) and any one of polymer resins.

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