Self-adhesive PVC decorative film

Abstract

The utility model is applicable to the technical field of decorative films, and discloses a self-adhesive PVC (polyvinyl chloride) decorative film which sequentially comprises a scratch-resistant layer, a soft PVC base material layer, a pattern printing layer, a hard PVC base material layer, a back coating layer, an adhesive sticker layer and a release paper layer from top to bottom. According to the self-adhesive PVC decorative film, the scratch-resistant layer is arranged on the surface of the soft PVC base material layer, so that the scratch resistance of the self-adhesive PVC decorative film is improved, scratches on the surface of the decorative film are few, and good appearance and decorative effect can be kept. The soft PVC base material layer and the hard PVC base material layer printed with the pattern printing layer are compounded together, so that the flexibility and the elasticity of the self-adhesive decorative film are improved, the decorative film can better adapt to objects with different shapes and surfaces, construction is easy, meanwhile, the decorative film can resist external force impact when being transported, constructed and used for decoration, and the service life of the decorative film is prolonged. Therefore, the decorative film is not easy to damage and crack, and the attractiveness and the integrity of decorated and repaired articles are not influenced.

Description

Technical Field

[0001] This utility model relates to the field of decorative film technology, and in particular to a self-adhesive PVC decorative film. Background Technology

[0002] Self-adhesive PVC decorative film is a self-adhesive decorative material made of polyvinyl chloride (PVC) as the main material and processed through a special process. It has the advantages of strong decorative properties, convenient construction, environmental protection and good durability. It is widely used in home decoration (including furniture surface damage repair), commercial space decoration, as well as decoration and protection of electronic product shells, automobile interiors, handicrafts and other products.

[0003] Existing self-adhesive PVC decorative films typically consist of a substrate layer, an adhesive layer, and a release paper layer (e.g., the PVC wallpaper for home decoration disclosed in Chinese patent document CN108485545A). However, existing self-adhesive PVC decorative films are insufficient in terms of scratch resistance and impact resistance. Not only are they easily damaged during transportation and construction when they collide, but damage and cracks in the self-adhesive PVC decorative film also affect the aesthetics and integrity of the decorated and repaired items.

[0004] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0005] The present invention aims to provide a self-adhesive PVC decorative film, which solves the problems of insufficient scratch resistance and impact resistance of existing self-adhesive PVC decorative films. Not only are self-adhesive PVC decorative films easily damaged when they collide during transportation and construction, but damage and cracks in self-adhesive PVC decorative films also affect the aesthetics and integrity of the decorated and repaired items.

[0006] To achieve the above objectives, the solution provided by this utility model is as follows:

[0007] A self-adhesive PVC decorative film, comprising, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0008] Optionally, the scratch-resistant layer is a skin-feel coating, and the thickness of the scratch-resistant layer is 4 to 15 μm.

[0009] Optionally, the thickness of the flexible PVC substrate layer is 0.03 to 0.08 mm.

[0010] Optionally, the thickness of the pattern printing layer is 4–15 μm.

[0011] Optionally, the thickness of the rigid PVC substrate layer is 0.07 to 0.12 mm.

[0012] Optionally, the flexible PVC substrate layer is a flexible transparent PVC substrate layer, and the rigid PVC substrate layer is a rigid solid-color PVC substrate layer.

[0013] Optionally, the back coating is a polyurethane back coating, and the thickness of the polyurethane back coating is 4 to 15 μm.

[0014] Optionally, the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer, and the thickness of the water-based acrylic pressure-sensitive adhesive layer is 0.01 to 0.1 mm.

[0015] Optionally, the thickness of the release paper layer is 0.1 to 0.3 mm.

[0016] Optionally, the back of the release paper layer is printed with a mesh pattern, which consists of multiple 1cm x 1cm grids.

[0017] Beneficial effects:

[0018] This invention provides a self-adhesive PVC decorative film. By setting a scratch-resistant layer on the surface of a soft PVC substrate layer, the scratch resistance of the self-adhesive PVC decorative film is improved, resulting in fewer scratches on the surface and maintaining a good appearance and decorative effect. Furthermore, by laminating the soft PVC substrate layer with a rigid PVC substrate layer printed with a pattern, the flexibility and elasticity of the self-adhesive decorative film are increased. This allows the film to better adapt to objects of different shapes and surfaces, facilitating construction. Simultaneously, it also enables the decorative film to resist external impacts during transportation, construction, and decoration. Therefore, the decorative film is less prone to damage and cracks, and will not affect the aesthetics and integrity of the decorated or repaired items. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the layered structure of the self-adhesive PVC decorative film provided by this utility model.

[0020] Figure 2 This is a graph showing the changing trend of the peel force of different thicknesses of self-adhesive layers on the surface of the adhered object.

[0021] Explanation of icon numbers:

[0022] 1-Scratch-resistant layer; 2-Soft PVC substrate layer; 3-Pattern printing layer; 4-Rigid PVC substrate layer; 5-Back coating layer; 6-Adhesive layer; 7-Release paper layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] It should also be noted that when a component is referred to as "fixed to" or "attached to" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0026] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0027] Please see Figure 1 This utility model provides a self-adhesive PVC decorative film, which comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0028] Specifically, the scratch-resistant layer is located on the top layer of the self-adhesive PVC decorative film. It improves the scratch resistance of the decorative film, protects the soft PVC substrate layer from scratches and damage from external objects, minimizes scratches on the surface of the decorative film, and maintains a good appearance and decorative effect. The soft PVC substrate layer is a soft PVC film with a plasticizer content of 16 PHR (PHR refers to parts per hundred parts of resin) or higher. It is soft and has good toughness, increasing the flexibility and elasticity of the decorative film, allowing it to better adapt to objects of different shapes and surfaces, facilitating construction, and also mitigating external impacts to some extent, reducing damage to the underlying structure. The pattern printing layer can be formed by transferring water-based ink onto the rigid PVC substrate layer using a printing roller and then curing the water-based ink. The pattern printing layer can display various colors, patterns, and textures, providing a rich variety of decorative effects to meet the personalized aesthetic needs of different users.

[0029] Specifically, the rigid PVC substrate layer is a rigid PVC film. The amount of plasticizer added to the rigid PVC film is less than 6 PHR, which enhances the overall structural toughness and strength of the PVC film. This allows the self-adhesive PVC decorative film to resist external impacts during transportation, construction, and decoration. The self-adhesive PVC decorative film is not easily damaged or cracked, and will not affect the aesthetics and integrity of the decorated or repaired items. In addition, the rigid PVC substrate layer can better resist the effects of unevenness (such as dents and bumps) and impurities on the surface of the decorated or repaired items, making the overall surface of the self-adhesive PVC decorative film smoother, thereby improving the appearance quality and performance of the product. The back coating layer enhances the adhesion between the rigid PVC substrate layer and the self-adhesive layer, firmly bonding the back of the self-adhesive layer and the rigid PVC substrate layer together. The self-adhesive layer is adhesive, which can adhere tightly to various object surfaces, providing a reliable bonding effect and ensuring that the self-adhesive PVC decorative film will not easily fall off during use. The release paper layer is located at the bottom of the self-adhesive PVC decorative film. When the self-adhesive PVC decorative film is not in use, it can protect the self-adhesive layer and prevent the self-adhesive layer from being contaminated or prematurely sticking together. This allows the self-adhesive PVC decorative film to be directly rolled up, stored, and transported.

[0030] Optionally, the scratch-resistant layer is a skin-feel coating. This skin-feel coating is formed by applying a skin-feel paint to a flexible PVC substrate layer and then curing it. The skin-feel paint is typically composed of resin materials such as polyurethane. After curing, it forms a protective film to a certain extent, thus protecting the flexible PVC substrate layer from scratches and damage from external objects. Furthermore, the surface of the skin-feel coating is usually smooth with low roughness. A smooth surface reduces friction with external objects, thereby reducing the formation of scratches.

[0031] When the scratch-resistant layer is too thin, the skin-feel coating cannot effectively fill the microscopic defects on the surface of the flexible PVC substrate layer. The surface of the flexible PVC substrate layer is still easily affected by external factors, making it prone to scratches. Moreover, when the scratch-resistant layer is too thin, the adhesion between the scratch-resistant layer and the flexible PVC substrate layer is weak, and the scratch-resistant layer cannot effectively protect the flexible PVC substrate layer. On the other hand, when the scratch-resistant layer is too thick, the cost of using the skin-feel coating increases, and the self-adhesive PVC decorative film loses its original flexibility and elasticity, thus limiting the application of the self-adhesive PVC decorative film. Therefore, in a preferred embodiment, the thickness of the scratch-resistant layer is controlled between 4 and 15 μm.

[0032] Optionally, the thickness of the flexible PVC substrate layer is 0.03 to 0.08 mm, which ensures that the self-adhesive PVC decorative film has good flexibility and elasticity, and also prevents the self-adhesive PVC decorative film from being too soft and easily damaged by hard objects due to the flexible PVC layer being too thick.

[0033] Optionally, the thickness of the pattern printing layer is 4-15 μm, which can ensure the clarity of the pattern printing layer while keeping the printing cost from being too high.

[0034] Optionally, the thickness of the rigid PVC substrate layer is 0.07–0.12 mm. When the thickness of the rigid PVC substrate layer is less than 0.07 mm, its tensile strength is relatively low. During the production of self-adhesive PVC decorative film, the tension can cause the rigid PVC substrate layer to be stretched and deformed, and even wrinkles may appear in the middle of the rigid PVC substrate layer, resulting in a decrease in the printing quality of the pattern. When the thickness of the rigid PVC substrate layer is greater than 0.12 mm, the rigid PVC substrate layer is too stiff, making it difficult to bend and hindering the transfer of water-based ink materials to the surface of the rigid PVC substrate layer.

[0035] Optionally, the flexible PVC substrate layer is a flexible transparent PVC substrate layer. When the pattern printing layer is located below the transparent PVC substrate layer, the pattern of the pattern printing layer can be clearly displayed, giving the self-adhesive PVC decorative film a decorative effect. The rigid PVC substrate layer is a rigid PVC color-developing substrate layer, which can achieve various colors by adding different pigments, providing a rich selection of colors for the self-adhesive PVC decorative film.

[0036] Optionally, the back coating is a polyurethane back coating. The polyurethane back coating is formed by applying polyurethane resin to the back of a rigid PVC substrate layer and then drying and curing it. Because polyurethane resin contains various active groups, it can chemically react with the surfaces of various materials to form strong chemical bonds, thus enabling the adhesive layer and the back of the rigid PVC substrate layer to be firmly bonded together.

[0037] If the polyurethane back coating is too thin, it cannot provide enough active groups to fully react with the adhesive layer and the rigid PVC substrate layer, resulting in weak chemical bonding. During use, the adhesive layer is prone to detaching from the back of the rigid PVC substrate layer, reducing the overall performance and lifespan of the self-adhesive PVC decorative film. Conversely, if the polyurethane back coating is too thick, it reduces the overall flexibility of the self-adhesive PVC decorative film, making it stiff and prone to breakage when bent or folded, limiting its application in scenarios involving irregularly shaped items. Therefore, in a preferred embodiment, the thickness of the polyurethane back coating is controlled between 4 and 15 μm.

[0038] Optionally, the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer. The water-based acrylic pressure-sensitive adhesive layer contains hydroxyl and carboxyl groups, which can chemically react with the isocyanate groups in the polyurethane backing coating, thereby enabling the self-adhesive layer and the polyurethane backing coating to adhere together. When the release paper layer is peeled off from the self-adhesive layer, the decorative film has a self-adhesive function.

[0039] Figure 2 This diagram illustrates the variation trend of peel force on the surface of the adhered object for self-adhesive layers of different thicknesses (other layers of the PVC decorative film remain the same thickness). The peel force test standard is GB / T2792-2014 "Test Method for Peel Strength of Adhesive Tapes". Figure 2 It can be seen that when the thickness of the self-adhesive layer is less than 0.01 mm, the peel force of the self-adhesive layer on the surface of the adhered object is less than 10 N. When the thickness of the self-adhesive layer is between 0.01 and 0.1 mm, the peel force gradually increases with the increase of the self-adhesive layer thickness. However, when the thickness of the self-adhesive layer is greater than 0.1 mm, the increase in the peel force gradually slows down. Therefore, in a preferred embodiment, the thickness of the self-adhesive layer (water-based acrylic pressure-sensitive adhesive layer) is controlled between 0.01 and 0.1 mm.

[0040] Optionally, the thickness of the release paper layer is 0.1 to 0.3 mm, which enables the centrifugal paper layer to have sufficient physical strength at a relatively low cost. During the handling and processing of self-adhesive PVC decorative film, the release paper layer is not easily damaged or torn, and the centrifugal paper layer can still protect the self-adhesive layer.

[0041] Optionally, the back of the release paper layer is printed with a mesh pattern, which consists of multiple 1cm x 1cm grids (i.e., grids with a length and width of 1cm), making it convenient to cut the self-adhesive PVC decorative film according to usage requirements during use.

[0042] To further illustrate the self-adhesive PVC decorative film provided by this utility model, the following embodiments and comparative examples are provided.

[0043] Example 1

[0044] This embodiment provides a self-adhesive PVC decorative film, which comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0045] The scratch-resistant layer is a skin-feel coating with a thickness of 5 μm; the soft PVC substrate layer has a thickness of 0.04 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 4 μm; the rigid PVC substrate layer has a thickness of 0.08 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 5 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.03 mm; and the release paper layer has a thickness of 0.1 mm.

[0046] Example 2

[0047] This embodiment provides a self-adhesive PVC decorative film, which comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0048] The scratch-resistant layer is a skin-feel coating with a thickness of 10 μm; the soft PVC substrate layer has a thickness of 0.05 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the rigid PVC substrate layer has a thickness of 0.09 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 10 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0049] Example 3

[0050] This embodiment provides a self-adhesive PVC decorative film, which comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0051] The scratch-resistant layer is a skin-feel coating with a thickness of 15 μm; the soft PVC substrate layer has a thickness of 0.08 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 15 μm; the rigid PVC substrate layer has a thickness of 0.12 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 15 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.1 mm; and the release paper layer has a thickness of 0.3 mm.

[0052] Comparative Example 1

[0053] This comparative example provides a self-adhesive PVC decorative film, which, from top to bottom, includes a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0054] The scratch-resistant layer is a skin-feel coating with a thickness of 3 μm; the soft PVC substrate layer has a thickness of 0.05 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the rigid PVC substrate layer has a thickness of 0.09 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 10 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0055] Comparative Example 2

[0056] This comparative example provides a self-adhesive PVC decorative film, which, from top to bottom, includes a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0057] The scratch-resistant layer is a skin-feel coating with a thickness of 18 μm; the soft PVC substrate layer has a thickness of 0.05 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the rigid PVC substrate layer has a thickness of 0.09 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 10 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0058] Comparative Example 3

[0059] This comparative example provides a self-adhesive PVC decorative film, which, from top to bottom, includes a scratch-resistant layer, a first soft PVC substrate layer, a pattern printing layer, a second soft PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0060] The scratch-resistant layer is a skin-feel coating with a thickness of 10 μm; the first soft PVC substrate layer has a thickness of 0.05 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the second soft PVC substrate layer has a thickness of 0.09 mm and is a soft PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 10 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0061] Comparative Example 4

[0062] This comparative example provides a self-adhesive PVC decorative film, which, from top to bottom, includes a scratch-resistant layer, a first rigid PVC substrate layer, a pattern printing layer, a second rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0063] The scratch-resistant layer is a skin-feel coating with a thickness of 10 μm; the first rigid PVC substrate layer has a thickness of 0.05 mm and is a soft, transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the second rigid PVC substrate layer has a thickness of 0.09 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 10 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0064] Comparative Example 5

[0065] This embodiment provides a self-adhesive PVC decorative film, which comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0066] The scratch-resistant layer is a skin-feel coating with a thickness of 10 μm; the soft PVC substrate layer has a thickness of 0.05 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the rigid PVC substrate layer has a thickness of 0.09 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 3 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0067] Comparative Example 6

[0068] This embodiment provides a self-adhesive PVC decorative film, which comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, an adhesive layer, and a release paper layer.

[0069] The scratch-resistant layer is a skin-feel coating with a thickness of 10 μm; the soft PVC substrate layer has a thickness of 0.05 mm and is a soft transparent PVC substrate layer; the pattern printing layer has a thickness of 10 μm; the rigid PVC substrate layer has a thickness of 0.09 mm and is a rigid PVC color-developing substrate layer; the back coating is a polyurethane back coating with a thickness of 17 μm; the self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer with a thickness of 0.05 mm; and the release paper layer has a thickness of 0.2 mm.

[0070] The scratch resistance of the self-adhesive PVC decorative film surfaces provided in Examples 1 to 3, as well as Comparative Examples 1 and 2, was tested according to the test methods specified in the standard BS EN 15186-2012 Furniture - Scratch Resistance Assessment. The test results are shown in Table 1 below.

[0071] Table 1:

[0072]

[0073]

[0074] As can be seen from the test results in Table 1, the scratch resistance (the amount of scratch force it can withstand) of the self-adhesive PVC decorative film provided in Comparative Example 1 is not as good as that of the self-adhesive PVC decorative films provided in Examples 1 to 3. This is because the scratch-resistant layer is thinner, the adhesion between the scratch-resistant layer and the soft PVC substrate layer is weaker, and the scratch-resistant layer cannot effectively protect the soft PVC substrate layer. Although the scratch resistance of the self-adhesive PVC decorative film provided in Comparative Example 2 is better than that of Examples 1 to 3, if the scratch-resistant layer is too thick, it is easy for the self-adhesive PVC decorative film to lose its original flexibility and elasticity.

[0075] The impact resistance of the self-adhesive PVC decorative films provided in Examples 1 to 3, as well as Comparative Examples 3 and 4, was tested according to the test method specified in the standard GB / T 9639.1-2008 Test Method for Impact Resistance of Plastic Films and Sheets - Free Falling Dart Method - Part 1: Step Method. The test results are shown in Table 2 below.

[0076] Table 2:

[0077] breakage rate Example 1 90% of the samples were intact Example 2 90% of the samples were intact Example 3 90% of the samples were intact Comparative Example 3 70% of the samples were intact Comparative Example 4 90% of the samples were intact

[0078] As can be seen from the test results in Table 2, the number of broken samples of the self-adhesive PVC decorative film provided in Comparative Example 3 was greater than that of the self-adhesive PVC decorative films provided in Examples 1 to 3 and Comparative Example 4. This is because the substrate layer used to support the pattern printing layer in the self-adhesive PVC decorative film provided in Comparative Example 1 is a soft PVC substrate layer, which makes the self-adhesive PVC decorative film generally soft and has weak impact resistance. Although the self-adhesive PVC decorative film provided in Comparative Example 4 has strong impact resistance and fewer broken samples during the test, it also has two rigid PVC substrate layers, which makes the self-adhesive PVC decorative film generally hard and inconvenient to construct.

[0079] The self-adhesive PVC decorative films provided in Examples 1 to 3, as well as Comparative Examples 5 and 6, were tested according to the test method specified in the standard GB / T2792-2014 Test Method for Peel Strength of Adhesive Tapes. The adhesion of the back coating layer to the self-adhesive layer was tested, and the test results are shown in Table 3 below.

[0080] Table 3:

[0081] Back coating adhesion Example 1 100% intact Example 2 100% intact Example 3 100% intact Comparative Example 5 80% of the samples were intact (20% of the mesh areas were peeled off). Comparative Example 6 100% intact

[0082] As can be seen from the test results in Table 3, in the self-adhesive PVC decorative film provided by Comparative Example 5, the adhesion of the back coating to the self-adhesive layer is not as good as that of the back coatings of different thicknesses in Examples 1 to 3 and Comparative Example 6. This is because the thickness of the back coating is too thin, which cannot provide enough active groups to fully react with the self-adhesive layer, resulting in insufficient chemical bonding between the back coating and the self-adhesive layer. In the self-adhesive PVC decorative film provided by Comparative Example 6, although the adhesion of the back coating to the self-adhesive layer is better, the thickness of the back coating is too thick, which reduces the overall flexibility of the self-adhesive PVC decorative film, making it stiff and limiting its application.

[0083] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A self-adhesive PVC decorative film, characterized in that, The self-adhesive PVC decorative film comprises, from top to bottom, a scratch-resistant layer, a soft PVC substrate layer, a pattern printing layer, a rigid PVC substrate layer, a back coating layer, a self-adhesive layer, and a release paper layer; the scratch-resistant layer is a skin-feel coating, and the thickness of the scratch-resistant layer is 4-15 μm; the skin-feel coating is a polyurethane coating.

2. The self-adhesive PVC decorative film according to claim 1, characterized in that, The thickness of the flexible PVC substrate layer is 0.03 to 0.08 mm.

3. The self-adhesive PVC decorative film according to claim 1, characterized in that, The thickness of the pattern printing layer is 4–15 μm.

4. The self-adhesive PVC decorative film according to claim 1, characterized in that, The thickness of the rigid PVC substrate layer is 0.07 to 0.12 mm.

5. The self-adhesive PVC decorative film according to claim 1, characterized in that, The soft PVC substrate layer is a soft transparent PVC substrate layer, and the rigid PVC substrate layer is a rigid solid-color PVC substrate layer.

6. The self-adhesive PVC decorative film according to claim 1, characterized in that, The back coating is a polyurethane back coating, and the thickness of the polyurethane back coating is 4-15 μm.

7. The self-adhesive PVC decorative film according to claim 1, characterized in that, The self-adhesive layer is a water-based acrylic pressure-sensitive adhesive layer, and the thickness of the water-based acrylic pressure-sensitive adhesive layer is 0.01 to 0.1 mm.

8. The self-adhesive PVC decorative film according to claim 1, characterized in that, The thickness of the release paper layer is 0.1 to 0.3 mm.

9. The self-adhesive PVC decorative film according to claim 1, characterized in that, The back of the release paper layer is printed with a mesh pattern, which is formed by multiple 1cm x 1cm grids.

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