An aviation interior wallpaper and its preparation method

Abstract

The present invention discloses a novel aviation interior wallpaper and a preparation method thereof. The wallpaper includes: a transparent PVF film layer, a first adhesive layer, a printing layer, a first white PVF film layer, a second adhesive layer, and a second white PVF film layer which are laminated in sequence. The printing layer uses a water-based ink of a polyurethane and acrylic mixed system. The present invention has the characteristics of good weather resistance, good stability, light weight, low heat release, and excellent mechanical properties.

Description

Technical Field

[0001] The present invention relates to aerospace interior materials, and particularly to a new type of aerospace interior wallpaper comprising three PVF film layers and a preparation method thereof. Background Art

[0002] In the aerospace field, high requirements are imposed on interior decoration. Not only properties such as stain resistance, corrosion resistance, wear resistance, and heat release need to be considered, but also certain requirements are placed on the aesthetics, weight, and environmental protection performance of the wallpaper.

[0003] Patent CN109849474A discloses a wallpaper for aerospace interior decoration, which includes a PVF film layer, an adhesive layer, and a PVC film layer. However, the PVC film included in this wallpaper has environmental protection hazards. Not only is its preparation monomer a suspected carcinogen, but plasticizers, antioxidants, heat stabilizers, etc. need to be added during the preparation process to ensure stability during the processing, and there is a possibility of precipitation during subsequent use. In addition, this wallpaper is relatively thick, has low tear strength, and high areal density. In order to ensure the mechanical properties of the wallpaper, it is difficult to make the thickness of the PVC film layer less than 80 μm.

[0004] Patent CN209738447U discloses a flame-retardant high-performance wallpaper for aerospace interior decoration, which includes a transparent PVF film, a printing layer, a polycarbonate layer (PC layer), and a white PVF film. Although this wallpaper solves the environmental protection hazards, the polycarbonate layer is prone to stress cracking, has poor solvent resistance, is not alkali-resistant, is prone to hydrolysis at high temperatures, is highly sensitive to notches, has poor ultraviolet light resistance, is prone to yellowing after long-term use, and is prone to yellowing when heated.

[0005] Therefore, it is necessary to find an intermediate printing layer material that can perfectly replace the PVC film and the PC film. The PVF film has been applied to the interior decoration and composite material fields of aerospace since the 1960s. It is healthy and environmentally friendly, flame-retardant and low-smoke, has low heat release, excellent weather resistance, excellent mechanical properties, and is light in weight. However, it is different from the PVC and PC films in that ordinary polyurethane inks and acrylic inks can be used to achieve the printing effect. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a new type of aerospace interior wallpaper that is healthy and environmentally friendly, has good weather resistance, excellent mechanical properties, good formability, low heat release, light weight, and good stability.

[0007] The object of the present invention is achieved by the following technical solutions:

[0008] A new type of aerospace interior wallpaper, which comprises a transparent PVF film layer, a first adhesive layer, a printing layer, a first white PVF film layer, a second adhesive layer, and a second white PVF film layer stacked in sequence.

[0009] Preferably, the printing layer uses a water-based ink of a polyurethane and acrylic acid mixed system. When the water-based ink of the polyurethane and acrylate mixed system is printed on the PVF film, the ink and the PVF film can fit perfectly, ensuring the stability of the wallpaper. The acrylic acid system ink forms a good film on the PVF film. When used in combination with the polyurethane system ink, the ink can adhere more densely to the PVF film, achieving a good printing effect and at the same time ensuring the heat and weather resistance of the printing layer.

[0010] More preferably, the mass ratio of polyurethane to acrylic acid in the water-based ink of the polyurethane and acrylic acid mixed system is 1-4:1. Most preferably, the mass ratio of polyurethane to acrylic acid in the water-based ink of the polyurethane and acrylic acid mixed system is 2-3:1.

[0011] Furthermore, the polyurethane is selected from at least one of anionic polyurethane, cationic polyurethane, non-ionic polyurethane, and mixed polyurethane.

[0012] Preferably, the polyurethane is selected from anionic polyurethane; more preferably, the anionic polyurethane is selected from at least one of carboxyl-type polyurethane or sulfonate polyurethane.

[0013] Furthermore, the acrylic acid is selected from at least one of methyl methacrylate, methyl acrylate, ethyl acrylate, butyl methacrylate, butyl acrylate, and isooctyl acrylate.

[0014] According to the above-mentioned new aviation interior wallpaper, preferably, the thickness of the transparent PVF film layer is 20-40 μm, and the light transmittance ≥ 80%. More preferably, the thickness of the transparent PVF film layer is 25-30 μm, and the light transmittance is 90%. The transparent PVF film layer with this thickness will neither affect the visual effect of the printing layer due to being too thick nor affect the mechanical properties of the wallpaper due to being too thin.

[0015] According to the above-mentioned new aviation interior wallpaper, preferably, the thickness of the first white PVF film layer and the second white PVF film layer is 25-60 μm. More preferably, the thickness of the first white PVF film layer and the second white PVF film layer is 45-55 μm. More preferably, the transverse thermal shrinkage rate of the first white PVF film layer and the second white PVF film layer ≤ 2%, ensuring the dimensional stability during high-temperature processing; the tensile strength of the first white PVF film layer and the second white PVF film layer ≥ 50 MPa, and the elongation at break ≥ 130%. The excellent mechanical properties can solve the problem of the wallpaper breaking due to extension during post-processing.

[0016] According to the above-mentioned new aviation interior wallpaper, preferably, the thickness of the first adhesive layer and the second adhesive layer is 3-10 μm. More preferably, the thickness of the first adhesive layer and the second adhesive layer is 5-7 μm.

[0017] Further, the first adhesive layer and the second adhesive layer adopt a two-component polyurethane adhesive. The two-component polyurethane adhesive not only has excellent weather resistance and is not prone to discoloration and delamination after long-term use, but also has excellent flame retardancy and good safety.

[0018] According to the above-mentioned new aviation interior wallpaper, preferably, the thickness of the printing layer is 3-10 μm. More preferably, the thickness of the printing layer is 5-7 μm.

[0019] In order to improve the aesthetic degree of the wallpaper and make it more layered and textured, further, the surface of the wallpaper is pressed with concave-convex patterns.

[0020] In order to reduce the construction difficulty of the wallpaper and improve the on-site operation efficiency, the wallpaper further includes an adhesive layer and an adhesive protective layer. The adhesive layer is placed between the adhesive protective layer and the second white PVF film layer. The material of the adhesive protective layer is a release film or release paper coated with silicone oil, with a release force of 10-30 g and a thickness of 25-120 μm. During on-site operation, only the adhesive protective layer needs to be torn off to paste the wallpaper on the aviation interior part substrate, which is convenient and fast.

[0021] The present invention also provides a preparation method for the above-mentioned new aviation interior wallpaper, and the preparation method includes the following steps:

[0022] A1. Coat the second adhesive layer on the surface of the first white PVF film layer or the second white PVF film layer and dry it. Then, laminate the first white PVF film layer and the second white PVF film. After lamination, cure at 30-50 °C for 24-72 h to obtain a composite substrate;

[0023] A2. Coat the printing layer on the composite substrate to obtain a printed substrate;

[0024] A3. Coat the first adhesive layer on the surface of the transparent PVF film layer and dry it. Then, laminate the printed substrate and the transparent PVF film layer to obtain the wallpaper.

[0025] Further, the first adhesive layer and the second adhesive layer adopt a coating drying oven to dry the coating. The high-temperature zone temperature for drying the first adhesive layer is 70 °C - 100 °C, and the linear speed is 20-50 m / min; the high-temperature zone temperature for drying the second adhesive layer is 70 °C - 110 °C, and the linear speed is 20-50 m / min.

[0026] Preferably, in step A1, the temperature of the high temperature drying zone of the second adhesive layer is 100°C, and the line speed is 40m / min; the aging temperature is 50°C, and the aging time is 48h; in step A3, the temperature of the high temperature drying zone of the first adhesive layer is 105°C, and the line speed is 40m / min.

[0027] Furthermore, in step A1, the composite temperature of the first white PVF film layer and the second white PVF film layer is 25°C to 120°C, and the pressure is 0.3MPa to 2.0MPa. More preferably, the composite temperature of the first white PVF film layer and the second white PVF film layer is 50 to 100°C, and the pressure is 0.5 to 0.8MPa.

[0028] Furthermore, in step A3, the temperature of the printed substrate and the transparent PVF film layer when laminating is 80°C to 140°C, and the pressure is 0.3 to 2.0 MPa. More preferably, the temperature of the printed substrate and the transparent PVF film layer when laminating is 100 to 120°C, and the pressure is 0.5 to 0.8 MPa.

[0029] According to the preparation method of the novel aviation interior wallpaper, the preparation method further comprises: pressing concave and convex patterns on the surface of the wallpaper, the pressing temperature is 120°C to 190°C, and the pressure is 0.3Mpa to 5.0MPa. More preferably, pressing concave and convex patterns on the surface of the transparent PVF film layer, the pressing temperature is 160 to 180°C, and the pressure is 1.0 to 3.0MPa.

[0030] Furthermore, the preparation method further comprises: adding a 40-50 μm adhesive layer on the surface of the second white PVF film layer by a scraping process, and adding an adhesive protective layer for protection.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention adopts three-layer PVF film composite wallpaper, which is light in weight, has good weather resistance, chemical corrosion resistance, high and low temperature impact resistance, antibacterial and mildew proof, easy to clean and anti-graffiti, low heat release, and is environmentally friendly and healthy.

[0033] 2. The present invention adopts PVF film as the middle layer, which not only has excellent mechanical properties such as tensile strength, elongation at break, and tear strength, but also reduces the thickness of the wallpaper and reduces the weight of the wallpaper.

[0034] 3. The present invention uses a polyurethane and acrylate mixed system water-based ink to print on the PVF film, solving the problem of poor printing effect on the PVF film in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A structural schematic diagram of a novel aviation interior wallpaper according to Example 1 of the present invention is given;

[0036] Figure 2 Figure 2 shows the structural schematic diagram of the novel aviation interior wallpaper according to Embodiment 3 of the present invention. Specific Embodiments

[0037] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all alternative solutions, improvement solutions, and equivalent solutions that may be included within the scope of the claims.

[0038] Embodiment 1

[0039] Figure 1 Figure 3 shows the structural sketch of the novel aviation interior wallpaper of this embodiment, as Figure 1 shown, the wallpaper includes:

[0040] A transparent PVF film layer 1, the thickness of the transparent PVF film layer is 30μm, the light transmittance is 92%, and uneven textures 0-1 are pressed on the surface;

[0041] A first adhesive layer 2, the first adhesive layer uses a two-component polyurethane adhesive, and the thickness is 7μm;

[0042] A printing layer 3, the thickness of the printing layer is 5μm, and it is printed with a water-based ink of a polyurethane and acrylic acid mixed system, and the mass ratio of polyurethane to acrylic acid is 3:1; the polyurethane is sulfonate polyurethane, and the acrylic acid is composed of methyl methacrylate and butyl acrylate in a mass ratio of 4:1;

[0043] A first white PVF film layer 4, the thickness of the first white PVF film layer is 50μm;

[0044] A second adhesive layer 5, the second adhesive layer uses a two-component polyurethane adhesive, and the thickness is 5μm;

[0045] A second white PVF film layer 6, the thickness of the first white PVF film layer is 50μm.

[0046] The preparation steps of the wallpaper are as follows:

[0047] S1. Coat the second adhesive layer on the surface of the second white PVF film layer and dry it using a seven-section coating drying oven. The drying temperature in the high-temperature zone is 100°C, and the linear speed is 40m / min; then, laminate the first white PVF film layer and the second white PVF film at a temperature of 50°C and a pressure of 0.8MPa, and finally cure in a drying oven at 40°C for 48h to obtain a composite substrate;

[0048] A2. Coat the printing layer on the composite substrate to obtain a printed substrate;

[0049] A3. Coat the first adhesive layer on the surface of the transparent PVF film layer and dry it using a seven-section coating drying oven. The drying temperature in the high-temperature zone is 105°C, and the linear speed is 40 m / min. Then, laminate the substrate with the printed pattern and the transparent PVF film layer at a temperature of 120°C and a pressure of 0.8 MPa.

[0050] A4. Press concave and convex patterns on the surface of the transparent PVF film layer at a temperature of 160°C and a pressure of 2.0 MPa to obtain a new type of aviation interior wallpaper.

[0051] Example 2

[0052] This example provides a kind of aviation interior wallpaper. Compared with Example 1, the only difference is that 5.0% curing agent is added to the water-based ink of the polyurethane and acrylic mixed system used in the printing layer.

[0053] Example 3

[0054] Figure 2 The structural schematic diagram of the new type of aviation interior wallpaper in this example is given. Different from the new type of aviation interior wallpaper described in Example 1, the new type of aviation interior wallpaper in this example further includes, on the basis of Example 1:

[0055] An adhesive layer 7, which is obtained by scraping pressure-sensitive adhesive, and the thickness of the adhesive layer is 45 μm;

[0056] An adhesive protective layer 8, the material of which is release paper coated with silicone oil, the release force is 20 g, and the thickness is 100 μm.

[0057] The preparation of the wallpaper in this example further includes, on the basis of Example 1:

[0058] B1. Use the scraping method to scrape the acrylic-based pressure-sensitive adhesive on the release paper, with a wet weight of 80 g / ㎡, and enter the drying oven for drying at a temperature of 120°C and a linear speed of 40 m / min;

[0059] B2. At a temperature of 50°C and a pressure of 0.35 MPa, laminate the above-prepared new type of aviation interior wallpaper and the release paper coated with pressure-sensitive adhesive to obtain a self-adhesive new type of aviation interior wallpaper.

[0060] Comparative Example 1

[0061] This comparative example provides a kind of aviation interior wallpaper. Compared with Example 1, the only difference is that the printing layer in this comparative example is only printed with water-based ink of the polyurethane system (the same polyurethane as in Example 1), and a white PVC film layer is used to replace the first white PVF film layer. The thickness of the white PVC film layer is 80 μm, and the rest of the composition is the same as in Example 1.

[0062] Comparative Example 2

[0063] This comparative example provides an aviation interior wallpaper. Compared with Comparative Example 1, the only difference is that a 50-μm PC film is used instead of a PVC film.

[0064] Comparative Example 3

[0065] This comparative example provides an aviation interior wallpaper. Compared with Example 1, the only difference is that the printing layer is printed only with a separate polyurethane water-based ink (the same polyurethane as in Example 1). The adhesion of the printing layer is poor, and the peel strength is low after the PVF transparent film is laminated with the printed substrate.

[0066] Comparative Example 4

[0067] This comparative example provides an aviation interior wallpaper. Compared with Example 1, the only difference is that the printing layer is printed only with a separate acrylic water-based ink (the same acrylic as in Example 1). The adhesion of the printing layer is poor, and the peel strength is low after the PVF transparent film is laminated with the printed substrate.

[0068] The performance tests were carried out on the wallpapers of Examples 1-2 and Comparative Examples 1-2, and the results are shown in Table 1 below:

[0069] Table 1 Performance test results

[0070]

[0071]

Claims

1. An aviation interior wallpaper, characterized in that: The wallpaper includes a transparent PVF film layer, a first adhesive layer, a printing layer, a first white PVF film layer, a second adhesive layer, and a second white PVF film layer that are laminated in sequence; the printing layer uses a water-based ink of a polyurethane and acrylic acid mixed system; the thickness of the first white PVF film layer and the second white PVF film layer is 25 - 60 μm.

2. The aviation interior wall paper according to claim 1, wherein: In the water-based ink of the polyurethane and acrylic acid mixed system, the mass ratio of polyurethane to acrylic acid is 1 - 4:

1.

3. The aviation interior wallpaper according to claim 2, wherein: The polyurethane is selected from at least one of anionic polyurethane, cationic polyurethane, non-ionic polyurethane, and mixed polyurethane; the acrylic acid is selected from at least one of methyl methacrylate, methyl acrylate, ethyl acrylate, butyl methacrylate, butyl acrylate, and isooctyl acrylate.

4. The aviation interior wallpaper according to claim 1, characterized in that: The thickness of the transparent PVF film layer is 20 - 40 μm, and the light transmittance ≥ 80%.

5. The aviation interior wallpaper according to claim 1, characterized in that: The thickness of the first adhesive layer and the second adhesive layer is 3 - 10 μm.

6. The aviation interior wallpaper according to claim 1, wherein: The first adhesive layer and the second adhesive layer use a two-component flame-retardant and weather-resistant polyurethane adhesive.

7. The aviation interior wallpaper according to claim 1, wherein: The thickness of the printing layer is 3 - 10 μm.

8. The aviation interior wallpaper according to claim 1, characterized in that: The surface of the wallpaper is embossed with concave and convex patterns.

9. The aviation interior wallpaper according to claim 1, wherein: The wallpaper further includes an adhesive layer and an adhesive protective layer, and the adhesive layer is disposed between the adhesive protective layer and the second white PVF film layer.

10. The preparation method of the aircraft interior wallpaper according to any one of claims 1-9, characterized in that: The preparation method includes the following steps: A1. Coat the second adhesive layer on the surface of the first white PVF film layer or the second white PVF film layer and dry it, and then laminate the first white PVF film layer and the second white PVF film layer to obtain a composite substrate; A2. Coat the printing layer on the composite substrate to obtain a printed substrate; A3. Coat the first adhesive layer on the surface of the transparent PVF film layer and dry it, and then laminate the printed substrate and the transparent PVF film layer to obtain the wallpaper.

11. The preparation method of the aviation interior wallpaper according to claim 10, characterized in that: The first adhesive layer and the second adhesive layer are coated by microgravure coating, and after coating, they enter the drying oven for drying. The drying temperature is 70 - 110 °C, and the linear speed is 20 - 50 m / min.

12. The preparation method of the aviation interior wall paper according to claim 10, wherein: The lamination temperature of the first white PVF film layer and the second white PVF film layer is 25 - 120 °C, and the pressure is 0.3 - 2.0 MPa.

13. The preparation method of the aviation interior wallpaper according to claim 10, wherein: The lamination temperature of the printed substrate and the transparent PVF film layer is 100 - 140 °C, and the pressure is 0.3 - 2.0 MPa.

14. The preparation method of the aircraft interior wallpaper according to claim 10, characterized in that: The preparation method further includes: embossing concave and convex patterns on the surface of the transparent PVF film layer, with the embossing temperature being 120 - 190 °C and the pressure being 0.3 - 5.0 MPa.

15. The preparation method of the aircraft interior wallpaper according to claim 10, wherein: The preparation method further includes: increasing a 40 - 50 μm adhesive layer on the surface of the second white PVF film layer through a scraping process and adding an adhesive protective layer for protection.

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