Humidity-heat-resistant long-service-life silver external reflection film

Abstract

The utility model discloses a damp-heat-resistant long-life silver external reflection film, which comprises a base body, a first bonding layer attached to the base body and a silver external reflection layer arranged on the first bonding layer, a multi-layer structure layer is arranged on the silver external reflection layer, and a waterproof coating is arranged on the multi-layer structure layer. According to the utility model, the number of stacked layers of the protection layers in the silver reflection film is increased, so that the reflectivity in a reflection band can be improved to a certain extent, and meanwhile, the protection effect on the silver film is enhanced; the waterproof film is evaporated on the outermost layer, and the contact area between water and the film layer is reduced by utilizing the hydrophobic characteristic of the waterproof film, so that the corrosion speed of the film layer is slowed down. Under the condition that the reflectivity of the obtained silver external reflection film is not affected, the damp-heat resistance test time can reach 58 hours, and compared with the damp-heat resistance time of a silver external reflection film obtained through a traditional method, the damp-heat resistance time is prolonged by more than one time.

Description

Technical Field

[0001] The utility model belongs to the technical field of reflective films, and in particular relates to a moisture-heat-resistant and long-life silver external reflective film. Background Art

[0002] Metal reflective film has the characteristics of simple film system, low preparation process requirements, and wide working wavelength range. It can maintain high reflectivity under a wide working wavelength, so it is used in fields such as large-aperture optical systems. As one of the most common metal films, silver film is widely used because it has the highest reflectivity in both the visible light region and the infrared band (95% and 99% respectively). However, silver materials have poor mechanical strength and chemical stability. When exposed to air, they are easily oxidized, sulfidized, and chlorinated, and lose their luster, resulting in a gradual decrease in reflection efficiency. The film made from it also has poor adhesion to the glass substrate, so silver film is mostly used as an internal reflective film.

[0003] In an optical system, when a silver film is used as an external reflective film, its performance directly affects the overall working life, so it must be designed with materials or structures to enhance its performance. In current technology, in order to enhance the adhesion between the silver film and the substrate, a bonding layer with good adhesion is usually used; in order to improve the mechanical strength and chemical stability of the silver film, a protective layer is required. For example, Al2O3 has good adhesion to the silver film and is often used as a substrate layer between the silver film and the substrate. In angular silver ornaments, Al2O3 can still provide good protection, but the waterproof ability of Al2O3 is also limited. SiO2 is also often used to protect the silver film. It has stable chemical properties, strong mechanical properties and anti-deliquescent properties, and can be used as an anti-corrosion protective film and passivation layer. Although the existing technical design can improve the performance of the silver outer film to a certain extent, the corrosion problem of the silver film during long-term use still causes the optical products equipped with reflectors to be regularly returned to the factory for inspection and replacement of damaged reflector components. Utility Model Content

[0004] The utility model aims to provide a moisture-heat resistant and long-life silver outer reflective film, aiming to make the silver outer reflective film meet the requirement of long-term moisture-heat resistance, have good firmness, and the parts plated with the silver outer reflective film have a long working life in use.

[0005] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a moisture-heat-resistant and long-life silver outer reflection film, comprising a substrate, a first bonding layer attached to the substrate and a silver outer reflection layer arranged on the first bonding layer, wherein a multi-layer structural layer is arranged on the silver outer reflection layer, and a waterproof coating is arranged on the multi-layer structural layer.

[0007] As a preferred solution, the multi-layer structure layer includes a plurality of transition bonding layers and a plurality of protective layers, and the transition bonding layers and the protective layers are alternately stacked in sequence from the silver outer reflection layer upward.

[0008] As a further preferred embodiment of the present invention, the multilayer structure layer includes a second bonding layer disposed on the silver outer reflective layer for improving the adhesion between the silver film and the glass substrate and a first protective layer disposed on the second bonding layer for improving the moisture and heat resistance of the silver film.

[0009] As another preferred embodiment of the present invention, the multi-layer structure layer includes a second bonding layer, a first protective layer, a third bonding layer and a second protective layer which are sequentially attached to the silver outer reflective layer from top to bottom.

[0010] As another preferred embodiment of the present invention, the multilayer structure layer includes a second bonding layer, a first protective layer, a third bonding layer, a second protective layer, ... an nth bonding layer and an n-1th protective layer attached to the silver outer reflective layer from top to bottom, wherein n is a natural number.

[0011] Preferably, the silver outer reflective layer is a silver layer; the waterproof coating is a hydrophobic film or a super hydrophobic film; and the first bonding layer is an aluminum oxide layer.

[0012] Preferably, the bonding layer is an aluminum oxide layer, and the protective layer is a silicon dioxide layer.

[0013] Preferably, the second bonding layer is an aluminum oxide layer, and the first protective layer is a silicon dioxide layer.

[0014] As a further preferred solution, the third bonding layer is an aluminum oxide layer, and the second protective layer is a silicon dioxide layer.

[0015] As a further preferred embodiment, the first bonding layer, the second bonding layer, the third bonding layer, ... the nth bonding layer are all aluminum oxide layers, and the first protective layer, the second protective layer, ... the n-1th protective layer are all silicon dioxide layers.

[0016] The utility model has the following beneficial effects:

[0017] By increasing the number of stacked protective layers in the silver reflective film, the reflectivity within the reflection band can be improved to a certain extent, and the protective effect of the silver film is also strengthened; the outermost layer of evaporated waterproof film, using its hydrophobic properties, reduces the contact area between water and the film layer, thereby slowing down the corrosion rate of the film layer.

[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments 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 design solutions and drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the silver outer reflective film of Example 1 of the utility model;

[0021] Figure 2 This is a schematic structural diagram of the silver outer reflective film of Example 2 of the present utility model.

[0022] Description of reference numerals:

[0023] 1. Matrix;

[0024] 2. The first bonding layer;

[0025] 3. Silver outer reflective layer;

[0026] 4. Second bonding layer;

[0027] 5. The first protective layer;

[0028] 6. The third bonding layer;

[0029] 7. Second protective layer;

[0030] 8. Waterproof coating.

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0032] The content of the present invention can be further understood in conjunction with the following detailed description of the preferred implementation method of the present invention and the included embodiments. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as those generally understood by ordinary technicians in the field to which the present invention belongs. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in the present invention, the definition of the term provided in the present invention shall prevail.

[0033] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] In a typical embodiment of the present application, a heat-resistant and long-life silver outer reflective film is provided, referring to Figure 1 and Figure 2 , comprising a substrate 1, a first adhesive layer 2 attached to the substrate 1, and a silver outer reflective layer 3 arranged on the first adhesive layer 2, wherein a multi-layer structural layer is arranged on the silver outer reflective layer 3, and a waterproof coating 8 is arranged on the multi-layer structural layer.

[0035] In a preferred embodiment, the multi-layer structure layer includes a plurality of transition bonding layers and a plurality of protective layers, and the transition bonding layers and the protective layers are alternately stacked in sequence from the silver outer reflection layer 3 upward.

[0036] In a specific embodiment, if Figure 1 As shown, the multilayer structure layer includes a second bonding layer 4 disposed on the silver outer reflection layer 3 for improving the adhesion between the silver film and the glass substrate and a first protective layer 5 disposed on the second bonding layer 4 for improving the moisture and heat resistance of the silver film.

[0037] In another specific embodiment, Figure 2 As shown, the multi-layer structure layer includes a second adhesive layer 4, a first protective layer 5, a third adhesive layer 6 and a second protective layer 7 which are sequentially attached to the silver outer reflective layer 3 from top to bottom.

[0038] In another preferred specific embodiment, the multilayer structural layer includes a second bonding layer 4, a first protective layer 5, a third bonding layer 6, a second protective layer 7, ... the nth bonding layer and the n-1th protective layer, which are attached to the silver outer reflective layer 3 from top to bottom, wherein n is a natural number.

[0039] Preferably, the silver outer reflective layer 3 is a silver layer; the waterproof coating 8 is a hydrophobic film or a super hydrophobic film (preferably a fluorine-modified polymer material containing siloxane groups).

[0040] Preferably, the transition bonding layer is an aluminum oxide layer, and the protective layer is a silicon dioxide layer.

[0041] In a further preferred embodiment, the first bonding layer 2, the second bonding layer 4, the third bonding layer 6, ... the nth bonding layer are all aluminum oxide layers, and the first protective layer 5, the second protective layer 7, ... the n-1th protective layer are all silicon dioxide layers.

[0042] The method for preparing the above-mentioned moisture-heat-resistant and long-life silver outer reflective film comprises the following steps:

[0043] S1, cleaning the substrate using an ion source;

[0044] S2, at a low temperature of 50° C., sequentially plate a first bonding layer 2, a silver outer reflection layer 3, and a second bonding layer, wherein the first bonding layer and the second bonding layer are plated by ion source assisted deposition, and the silver outer reflection layer 3 is plated by evaporation;

[0045] S3, depositing a first protective layer, a third bonding layer, a second protective layer, ... an nth bonding layer and an n-1th protective layer under a high temperature condition of 150° C. with the assistance of an ion source;

[0046] S4, cooling down to below 100°C again, evaporating a waterproof coating, and the coating is completed at this point to obtain a silver outer reflective film.

[0047] The utility model is further described below in conjunction with specific embodiments:

[0048] In the following examples and comparative examples, oil-free pumps (molecular pumps, cold pumps) and high-power ion sources are preferably used for processing. The obtained specimens are subjected to spectral tests and wet heat tests. The wet heat test is carried out using a wet heat chamber, and the optical properties are tested using a Shimadzu UV3600 spectrophotometer.

[0049] Comparative Example

[0050] The silver outer reflective film structure described in this comparative example is GLASS / Cr-Ag-Al2O3-Ta2O5 / AIR, and its specific structure is: a substrate, a chromium (Cr) layer attached to the substrate from bottom to top, a silver reflective layer for reflection, an aluminum oxide (Al2O3) layer and a tantalum pentoxide (Ta2O5) layer.

[0051] Example 1

[0052] The silver outer reflective film structure described in Example 1 is composed of GLASS / Al2O3-Ag-Al2O3-SiO2-(SH-HT) / AIR. Figure 1 As shown, its structure is: a substrate 1, a first bonding layer attached to the substrate 1 from bottom to top, namely an aluminum oxide (Al2O3) layer 2, a reflective silver reflective layer 3, a second bonding layer, namely an aluminum oxide (Al2O3) layer 4, a first protective layer, namely a silicon dioxide (SiO2) layer 5 and a waterproof coating (SH-HT).

[0053] Example 2

[0054] The silver outer reflective film structure described in Example 2 is composed of GLASS / Al2O3-Ag-Al2O3-SiO2-Al2O3-SiO2-(SH-HT) / AIR. Figure 2 As shown, its structure is: a substrate 1, a first bonding layer attached to the substrate 1 from bottom to top, namely an aluminum oxide (Al2O3) layer 2, a reflective silver reflective layer 3, a second bonding layer, namely an aluminum oxide (Al2O3) layer 4, a first protective layer, namely a silicon dioxide (SiO2) layer 5, a third bonding layer, namely an aluminum oxide (Al2O3) layer 6, a second protective layer, namely a silicon dioxide (SiO2) layer 7 and a waterproof coating (SH-HT).

[0055] The preparation of the silver outer reflective film in Example 2 includes the following steps:

[0056] Step 1: Clean the substrate and put it into the vacuum chamber of the coating machine. The equipment enters the coating state. After the vacuum degree reaches the requirement, start the ion source bombardment for 5 minutes for pre-cleaning;

[0057] Step 2: When the temperature is 50°C, an Al2O3 layer, an Ag layer, and an Al2O3 layer are plated respectively, and an ion source assisted deposition is used when the Al2O3 layer is plated;

[0058] Step 3: When the temperature is raised to 150°C, a SiO2 layer, an Al2O3 layer, and a SiO2 layer are deposited with the assistance of an ion source;

[0059] Step 4: Cool down to 100°C and deposit (SH-HT) hydrophobic film material. The coating is now completed and a silver outer reflective film is obtained.

[0060] The above comparative examples and embodiments are all plated on one side of the substrate, and the prepared test pieces are used to carry out the following performance tests.

[0061] 1. Spectral performance test

[0062] The film state of the specimen was observed under a light box, and the reflectance test module of Shimadzu UV3600 spectrophotometer was used to test in the visible region of 400nm-700nm, and the reflectance data was recorded. See Table 1.

[0063] Table 1 Reflectivity test results

[0064]

[0065] 2. Wet heat test

[0066] In the damp heat test, the test piece was placed without packaging in a damp heat box at a temperature of 40°C ± 2°C and a relative humidity of 90%-95%. The film state of the test piece was recorded every 2 hours until the film was corroded and fell off. The damp heat resistance of the silver outer reflective film of the comparative example and the embodiment was compared and statistically analyzed, as shown in Table 2 for details.

[0067] Table 2 Damp heat test results

[0068] Experimental groups Humidity and heat resistance Film state after damp heat test Reflectivity after wet heat test Comparative Example 24h Edge film peeling No impact Example 1 48h Pitting at some locations on the edge No impact Example 2 56h No change in film No impact

[0069] The results of the above comparative examples and embodiments show that, compared with conventional silver reflective films, the silver outer reflective film prepared by the method provided by the utility model has a moisture and heat resistance test time of up to 58 hours without affecting the reflectivity, and the moisture and heat resistance of the film layer is more than doubled.

[0070] The above description is only a preferred embodiment of the utility model, which is only illustrative of the utility model and does not limit the scope of the utility model. Without departing from the design spirit of the utility model, various modifications and improvements made by ordinary technicians in this field to the technical solution of the utility model should fall within the protection scope determined by the claims of the utility model.

Claims

1. A heat-resistant and long-life silver outer reflective film, characterized in that: It comprises a substrate (1), a first adhesive layer (2) attached to the substrate (1), and a silver outer reflection layer (3) arranged on the first adhesive layer (2), wherein a multi-layer structural layer is arranged on the silver outer reflection layer (3), and a waterproof coating (8) is arranged on the multi-layer structural layer; The silver outer reflection layer (3) is a silver layer, the waterproof coating (8) is a hydrophobic film or a super hydrophobic film, and the first bonding layer (2) is an aluminum oxide layer.

2. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 1, characterized in that: The multilayer structure layer comprises a plurality of transition bonding layers and a plurality of protective layers, wherein the transition bonding layers and the protective layers are alternately stacked in sequence from the silver outer reflection layer (3) upwards.

3. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 1, characterized in that: The multilayer structure layer comprises a second bonding layer (4) provided on the silver outer reflection layer (3) for improving the adhesion between the silver film and the glass substrate, and a first protective layer (5) provided on the second bonding layer (4) for improving the moisture and heat resistance of the silver film.

4. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 1, characterized in that: The multi-layer structure layer comprises a second adhesive layer (4), a first protective layer (5), a third adhesive layer (6) and a second protective layer (7) which are sequentially attached to the silver outer reflective layer (3) from top to bottom.

5. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 1, characterized in that: The multilayer structure layer comprises a second bonding layer (4), a first protective layer (5), a third bonding layer (6), a second protective layer (7), ... an nth bonding layer and an (n-1)th protective layer, which are sequentially attached to the silver outer reflective layer (3) from top to bottom, wherein n is a natural number.

6. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 2, characterized in that: The transition bonding layer is an aluminum oxide layer, and the protective layer is a silicon dioxide layer.

7. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 3, characterized in that: The second bonding layer (4) is an aluminum oxide layer, and the first protective layer (5) is a silicon dioxide layer.

8. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 4, characterized in that: The second bonding layer (4) and the third bonding layer (6) are both aluminum oxide layers, and the first protective layer (5) and the second protective layer (7) are both silicon dioxide layers.

9. The heat-resistant and moisture-resistant long-life silver external reflective film according to claim 5, characterized in that: The second bonding layer (4), the third bonding layer (6) ... the nth bonding layer are all aluminum oxide layers, and the first protective layer (5), the second protective layer (7) ... the (n-1)th protective layer are all silicon dioxide layers.

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