Decorative film for spraying
By setting a combination structure of polyurethane medium layer and back coating on the decorative film, the problem of paint peeling after painting caused by the smooth surface of the decorative film is solved, and the high adhesion and appearance quality of the decorative film are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-04-07
AI Technical Summary
The smooth surface of existing decorative films makes the paint layer easy to peel off after painting, which limits their application range.
The system employs a combination structure of a polyurethane dielectric layer and a back coating layer. A polyurethane corona layer is formed by coating a polyurethane dielectric layer on the surface of the substrate layer and performing corona treatment. At the same time, a back coating layer is formed on the back of the substrate layer, which increases the adhesion between the paint layer and the substrate layer. Furthermore, the surface smoothness is improved by combining soft and hard PVC layers.
It solves the problem of paint peeling after spraying, improves the adhesion and appearance quality of decorative film, and expands its application range.
Smart Images
Figure CN224089837U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of decorative film, especially a decorative film for spraying. BACKGROUND
[0002] At present, most of the household products use paint-free boards, but for part of the customer groups who need personalized customization, the paint-free boards cannot meet the appearance diversity. The traditional paint spraying furniture is all using solid wood processing, if directly spraying paint on the surface of the synthetic board, the paint spraying effect is particularly poor, and the ordinary decorative film such as PVC film is used for decoration and protection, but the surface of the decorative film is smooth, there is a paint layer falling off after paint spraying, which limits the application range of the decorative film.
[0003] Therefore, the prior art still needs to be improved and improved. UTILITY MODEL CONTENT
[0004] The utility model discloses a decorative film for spraying, which aims to solve the problem of paint layer falling off after paint spraying caused by the smooth surface of ordinary decorative film, which limits the application range of the decorative film.
[0005] To achieve the above-mentioned purpose, the utility model provides the scheme:
[0006] A decorative film for spraying, the decorative film for spraying comprises a polyurethane medium layer, a substrate layer and a back coating layer from top to bottom.
[0007] Optionally, the back coating layer is a polyurethane back coating layer.
[0008] Optionally, the substrate layer comprises a soft PVC layer and a hard PVC layer from top to bottom.
[0009] Optionally, the polyurethane medium layer comprises a polyurethane corona layer and a polyurethane middle layer from top to bottom.
[0010] Optionally, the thickness of the polyurethane medium layer is 0.1-0.2 mm.
[0011] Optionally, the thickness of the back coating layer is 0.1-0.2 mm.
[0012] Optionally, the roughness of the surface of the back coating layer is 45-60 uin.
[0013] Beneficial effects:
[0014] The utility model provides a kind of decorative film for spraying, adopt film material double-sided processing technology, by polyurethane medium layer is coated on the surface of substrate layer, the surface of polyurethane medium layer is carried out corona treatment simultaneously, polyurethane medium layer surface is formed with polyurethane corona layer, so that paint layer is firmly bonded on polyurethane medium layer after spraying, solve the problem of poor adhesion of paint layer to substrate layer after spraying;And by back-coating treatment is carried out on the back of substrate layer, get back-coating layer, can increase the adhesion of substrate layer and board, avoid the problem of decorative film and board open glue.
[0015] In addition, the utility model adopts soft PVC layer and hard PVC layer composite, make decorative film whole surface more even, can improve the appearance quality and usability of product. DRAWINGS
[0016] Figure 1 It is the layered structure schematic view of decorative film for spraying provided by the utility model.
[0017] REFERENCE SIGNS:
[0018] 1-polyurethane medium layer;101-polyurethane corona layer;102-polyurethane middle layer;2-substrate layer;201-soft PVC layer;202-hard PVC layer;3-back-coating layer. DETAILED DESCRIPTION
[0019] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.
[0021] It should also be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or can have a middle element. When an element is referred to as "connected" to another element, it can be directly connected to another element or can have a middle element.
[0022] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.
[0023] Please refer to Figure 1 The present application provides a kind of decorative film for spraying, the decorative film for spraying includes polyurethane medium layer, substrate layer and back coating layer from top to bottom.
[0024] Specifically, the substrate layer can be but not limited to PVC substrate layer (i.e. PVC film). The polyurethane medium layer is coated on the surface of the substrate layer by polyurethane resin and is formed by drying and curing. After the formation of the polyurethane medium layer on the surface of the substrate layer, the surface of the polyurethane medium layer has a certain roughness. This roughness increases the contact area between the paint material and the polyurethane medium layer. The film-forming material in the paint material will chemically react with the active groups in the polyurethane medium layer to form a chemical bond, so that the paint layer is firmly bonded to the polyurethane medium layer, thereby solving the problem of poor adhesion of the paint layer to the substrate layer after spraying. The back coating layer is formed on the back of the substrate layer, which can increase the adhesion of the substrate layer and the board, and avoid the problem of peeling of the decorative film from the board.
[0025] Optionally, the back coating layer is a polyurethane back coating layer. The polyurethane back coating layer is coated on the surface of the substrate layer by polyurethane resin and is formed by drying and curing. Since the polyurethane resin contains a variety of active groups, it can chemically react with the surface of a variety of materials to form a firm chemical bond. Therefore, it has good adhesion to various substrates including wood boards, and can ensure that the substrate layer is tightly combined with the board, without the problem of peeling of the decorative film from the board.
[0026] Optionally, the substrate layer includes a soft PVC layer and a hard PVC layer from top to bottom. The present application uses a combination of soft PVC layer and hard PVC layer. The soft PVC layer on the upper side ensures the surface resilience of the decorative film, and the hard PVC layer on the lower side can better resist the influence of unevenness (such as concave, convex) and impurities on the surface of the board, making the overall surface of the decorative film more flat, thereby improving the appearance quality and use performance of the product.
[0027] Optionally, the polyurethane medium layer comprises a polyurethane corona layer and a polyurethane middle layer from top to bottom.
[0028] Optionally, the thickness of the polyurethane medium layer is 0.1-0.2mm, which can ensure high adhesion of the paint layer to the polyurethane medium layer and the substrate layer, and meanwhile, the material cost is not too high.
[0029] Specifically, when the thickness of the polyurethane corona layer is thin, the surface tension of the polyurethane medium layer surface is basically unchanged, and it is difficult to improve the adhesion of the paint material to the polyurethane medium layer; when the thickness of the polyurethane corona layer is thick, the substrate layer is partially broken, therefore, in the optional embodiment of the utility model, the thickness of the polyurethane corona layer is controlled to be 10-50um.
[0030] Optionally, the thickness of the back coating layer is 0.1-0.2mm, which can ensure the adhesion of the back coating layer to the plate, and meanwhile, the material cost is not too high.
[0031] Optionally, the roughness of the surface of the back coating layer is 45-60uin. In the utility model, the surface sand content of the rubber roller is 200 mesh, and when the composite decorative film is processed, the surface of the back coating layer (i.e. the back of the decorative film) is processed, so that the roughness of the surface of the back coating layer is increased to 45-60uin, thereby the adhesion of the back coating layer to the plate can be further improved.
[0032] In order to further illustrate the decorative film for spraying provided by the utility model, the following examples and comparative examples are provided.
[0033] Example 1
[0034] The example provides a kind of decorative film for spraying, and the decorative film for spraying comprises polyurethane corona layer, polyurethane middle layer, soft PVC layer, hard PVC layer and polyurethane back coating layer from top to bottom in sequence.
[0035] The thickness of the polyurethane medium layer is 0.1mm, the thickness of the polyurethane corona layer is 12um, the thickness of the polyurethane back coating layer is 0.1mm, and the roughness of the surface of the back coating layer is 45-60uin.
[0036] Example 2
[0037] The example provides a kind of decorative film for spraying, and the decorative film for spraying comprises polyurethane corona layer, polyurethane middle layer, soft PVC layer, hard PVC layer and polyurethane back coating layer from top to bottom in sequence.
[0038] The thickness of the polyurethane medium layer is 0.2 mm, the thickness of the polyurethane corona layer is 45 um, the thickness of the polyurethane back coating layer is 0.2 mm, and the roughness of the surface of the back coating layer is 45-60 um.
[0039] Comparative Example 1
[0040] The comparative example provides a spray decorative film, which comprises, from top to bottom, a polyurethane corona layer, a polyurethane middle layer, a soft PVC layer, a hard PVC layer, and a polyurethane back coating layer.
[0041] The thickness of the polyurethane medium layer is 0.06 mm, the thickness of the polyurethane corona layer is 12 um, the thickness of the polyurethane back coating layer is 0.1 mm, and the roughness of the surface of the back coating layer is 45-60 um.
[0042] Comparative Example 2
[0043] The comparative example provides a spray decorative film, which comprises, from top to bottom, a polyurethane corona layer, a polyurethane middle layer, a soft PVC layer, a hard PVC layer, and a polyurethane back coating layer.
[0044] The thickness of the polyurethane medium layer is 0.1 mm, the thickness of the polyurethane corona layer is 8 um, the thickness of the polyurethane back coating layer is 0.1 mm, and the roughness of the surface of the back coating layer is 45-60 um.
[0045] Comparative Example 3
[0046] The comparative example provides a spray decorative film, which comprises, from top to bottom, a polyurethane corona layer, a polyurethane middle layer, a soft PVC layer, a hard PVC layer, and a polyurethane back coating layer.
[0047] The thickness of the polyurethane medium layer is 0.2 mm, the thickness of the polyurethane corona layer is 12, the thickness of the polyurethane back coating layer is 0.05 mm, and the roughness of the surface of the back coating layer is 45-60 um.
[0048] The spray decorative films provided by Example 1, Example 2, and Comparative Examples 1-3 are respectively sprayed with paint, and the thickness of the paint layer formed after the paint is cured is 0.1 mm. The adhesion of the paint layer is tested according to the test method specified in the standard "GB / T9286-2021 Paint and Varnish Cross-cut Test", and the test results are shown in Table 1.
[0049] Table 1:
[0050]
[0051] As can be seen from the test results in Table 1, the paint layer on the surface of the sprayable decorative film provided in Comparative Example 1 has a lower adhesion than that of Examples 1 and 2 and Comparative Example 3, because the thickness of the polyurethane medium layer in the sprayable decorative film provided in Comparative Example 1 is too thin, resulting in the need to improve the binding capacity of the paint layer. The paint layer on the surface of the sprayable decorative film provided in Comparative Example 2 has a lower adhesion than that of Examples 1 and 2 and Comparative Example 3, because when the thickness of the polyurethane corona layer is too thin, the surface tension of the surface of the polyurethane medium layer does not change substantially, making it difficult to improve the adhesion of the paint material to the polyurethane medium layer.
[0052] According to the test method specified in the standard "LYT2270-2016 Method for Determining the Wood Failure Rate of Glued Surfaces", the adhesion of the back surface (polyurethane back coating layer) of the sprayable decorative film provided in Examples 1 and 2 and Comparative Examples 1 to 3 to the substrate was tested, and the test results are shown in Table 2 below.
[0053] Table 2:
[0054]
[0055] As can be seen from the test results in Table 2, the adhesion of the back surface (polyurethane back coating layer) of the sprayable decorative film provided in Comparative Example 3 to the substrate is lower than that of Examples 1 and 2 and Comparative Examples 1 to 2, resulting in the substrate being less likely to break, and thus the wood failure rate value of the substrate is lower.
[0056] The above-described preferred embodiments of the present application are not intended to limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields, is included within the patent protection scope of the present application.
Claims
1. A decorative film for spraying, characterized in that, The decorative film for spraying comprises, from top to bottom, a polyurethane medium layer, a substrate layer, and a back coating layer; the polyurethane medium layer comprises, from top to bottom, a polyurethane corona layer and a polyurethane intermediate layer.
2. The decorative film for spraying according to claim 1, characterized in that, The back coating is a polyurethane back coating.
3. The decorative film for spraying according to claim 1, characterized in that, The substrate layer comprises, from top to bottom, a flexible PVC layer and a rigid PVC layer.
4. The decorative film for spraying according to claim 1, characterized in that, The thickness of the polyurethane corona layer is 10–50 μm.
5. The decorative film for spraying according to claim 1, characterized in that, The thickness of the polyurethane dielectric layer is 0.1 to 0.2 mm.
6. The decorative film for spraying according to claim 1, characterized in that, The thickness of the back coating is 0.1 to 0.2 mm.
7. The decorative film for spraying according to claim 1, characterized in that, The surface roughness of the back coating is 45–60 μm.