Automotive interior surface film

Abstract

The utility model provides a kind of automobile interior surface film, including sequentially layering from bottom to top of hot melt adhesive layer, protective layer, electroplating layer, semi-transparent ink layer, acrylic layer and hardness enhancement layer. Through the synergic design of multilayer composite structure, hot melt adhesive layer, protective layer, electroplating layer, semi-transparent ink layer, acrylic layer and hardness enhancement layer are sequentially superimposed, the cooperation of electroplating layer and semi-transparent ink layer is given semi-transparent metal texture to film body, meet the aesthetic demand of modern automobile interior, and the performance of each layer is complementary to realize excellent wear resistance, scratch resistance, high and low temperature resistance and other excellent durable performance, meanwhile, the thickness parameters of each layer are accurately matched, to ensure the overall flexibility and adhesion of film body, avoid the problems such as delamination and brittle fracture, effectively improve the use experience and service life.

Description

Technical Field

[0001] This utility model relates to the field of thin film technology, specifically to an automotive interior surface film. Background Technology

[0002] With the rapid development of the automotive industry, consumers have increasingly higher requirements for the quality of car interiors. They not only pay attention to the aesthetics and modernity of the interior, but also value its durability, such as wear resistance, scratch resistance, high and low temperature resistance, and chemical corrosion resistance. As a key component for enhancing the texture of the interior and protecting the interior substrate, automotive interior surface films are widely used in dashboards, center consoles, door panels, and other parts.

[0003] Existing automotive interior surface films mostly adopt a single coating or simple composite structure design, which cannot combine the modern feel of semi-transparent metallic texture with the durability of long-term use, thus affecting the user experience. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a film for automotive interior surfaces.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is: an automotive interior surface film, comprising a hot melt adhesive layer, a protective layer, an electroplating layer, a semi-transparent ink layer, an acrylic layer, and a hardness-enhancing layer stacked sequentially from bottom to top; The thickness of the hot melt adhesive layer is 20-50 μm; The thickness of the protective layer is 12-25 μm; The thickness of the electroplated layer is 0.1-0.5 μm; The thickness of the semi-transparent ink layer is 5-15 μm, and the light transmittance is 30-60%. The thickness of the acrylic layer is 50-254 μm; The thickness of the hardness-enhancing layer is 3-30 μm.

[0006] This invention utilizes a multi-layered composite structure with a synergistic design, sequentially stacking a hot melt adhesive layer, a protective layer, an electroplating layer, a semi-transparent ink layer, an acrylic layer, and a hardness-enhancing layer. The combination of the electroplating layer and the semi-transparent ink layer imparts a semi-transparent metallic texture to the film, meeting the aesthetic requirements of modern automotive interiors. Furthermore, the complementary properties of each layer achieve excellent durability, including wear resistance, scratch resistance, and resistance to high and low temperatures. Simultaneously, the thickness parameters of each layer are precisely matched to ensure the overall flexibility and adhesion of the film, preventing issues such as delamination and cracking, effectively improving the user experience and lifespan.

[0007] Furthermore, the hot melt adhesive layer is made of EVA hot melt adhesive with a melting point of 80-120℃.

[0008] Using the above-mentioned preferred solution, EVA hot melt adhesive has excellent bonding performance and weather resistance, enabling the surface film to adhere tightly to the automotive interior substrate, and preventing peeling or detachment.

[0009] Furthermore, the protective layer is made of PET film.

[0010] By adopting the above-mentioned preferred scheme, the PET film has excellent mechanical strength, high and low temperature resistance and chemical stability, and can effectively support the upper electroplating layer, semi-permeable ink layer and other structures, providing reliable structural support and protection for the lower hot melt adhesive layer and the upper functional layer, thus extending the overall service life of the film.

[0011] Furthermore, the electroplated layer is made of chromium or indium selenide metal and is prepared using a vacuum sputtering process.

[0012] Using the above-mentioned preferred scheme, chromium or indium selenide metals have excellent metallic luster and texture. Combined with vacuum sputtering process, they can form a uniform and dense electroplated layer, which can give the film a pure semi-transparent metallic texture and enhance the high-end and modern feel of the car interior.

[0013] Furthermore, the semi-transparent ink layer is made of polyurethane-based semi-transparent ink.

[0014] Using the above-mentioned preferred solution, polyurethane semi-transparent ink has good light transmittance, flexibility and adhesion. Its 30-60% light transmittance can work synergistically with the electroplating layer to make the film present a soft semi-transparent metallic effect, avoid the metallic luster being too dazzling and improve visual comfort.

[0015] Furthermore, the material of the hardness-enhancing layer is a UV-curable polyurethane acrylate resin.

[0016] Using the above-mentioned preferred solution, the UV-curable polyurethane acrylate resin exhibits high hardness after curing, significantly improving the wear and scratch resistance of the film surface. It can effectively resist damage from daily use of automotive interiors, such as scratches from fingernails and impacts from hard objects, maintaining a smooth and flat film surface. Simultaneously, this material possesses excellent resistance to yellowing and chemical corrosion, providing long-term protection against light, humidity, heat, and chemical stains, preventing yellowing and loss of gloss. Furthermore, the UV curing process offers rapid curing speed, enabling efficient film production. The cured resin exhibits strong adhesion to the acrylic layer, preventing delamination and peeling, ensuring long-term stability of the hardness enhancement effect, and further improving the film's durability and user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0019] The numbers and letters in the diagram represent the names of the corresponding components: 1-Hot melt adhesive layer; 2-Protective layer; 3-Electroplated layer; 4-Semi-transparent ink layer; 5-Acrylic layer; 6-Hardness-enhancing layer. Detailed Implementation

[0020] 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.

[0021] like Figure 1 As shown, an automotive interior surface film includes a hot melt adhesive layer 1, a protective layer 2, an electroplated layer 3, a semi-permeable ink layer 4, an acrylic layer 5, and a hardness-enhancing layer 6, which are stacked sequentially from bottom to top. The thickness of hot melt adhesive layer 1 is 20-50 μm; The thickness of protective layer 2 is 12-25 μm; The thickness of electroplated layer 3 is 0.1-0.5 μm; The thickness of the semi-transparent ink layer 4 is 5-15μm, and the light transmittance is 30-60%. The thickness of acrylic layer 5 is 50-254 μm; The thickness of the hardness-enhancing layer 6 is 3-30 μm.

[0022] The beneficial effects of adopting the above technical solution are as follows: through the synergistic design of the multi-layer composite structure, the hot melt adhesive layer, protective layer, electroplating layer, semi-transparent ink layer, acrylic layer and hardness enhancement layer are stacked in sequence. The combination of electroplating layer and semi-transparent ink layer gives the film a semi-transparent metallic texture, which meets the aesthetic requirements of modern automotive interiors. Furthermore, the complementary performance of each layer achieves excellent durability properties such as wear resistance, scratch resistance, and resistance to high and low temperatures. At the same time, the thickness parameters of each layer are precisely matched to ensure the overall flexibility and adhesion of the film, avoiding problems such as delamination and brittleness, effectively improving the user experience and service life.

[0023] In some other embodiments of this utility model, the hot melt adhesive layer 1 is made of EVA hot melt adhesive with a melting point of 80-120℃.

[0024] Using the above-mentioned preferred solution, EVA hot melt adhesive has excellent bonding performance and weather resistance, enabling the surface film to adhere tightly to the automotive interior substrate, and preventing peeling or detachment.

[0025] In some other embodiments of this utility model, the protective layer 2 is made of PET film. The beneficial effects of adopting the above technical solution are: PET film has excellent mechanical strength, high and low temperature resistance and chemical stability, and can effectively support the upper electroplating layer, semi-permeable ink layer and other structures, providing reliable structural support and protection for the lower hot melt adhesive layer and the upper functional layer, thus extending the overall service life of the film.

[0026] In some other embodiments of this utility model, the electroplated layer 3 is made of chromium or indium selenide metal and is prepared by vacuum sputtering. The beneficial effects of adopting the above technical solution are: chromium or titanium metal has excellent metallic luster and texture, and when combined with vacuum sputtering process, it can form a uniform and dense electroplated layer, which can give the film a pure semi-transparent metallic texture and enhance the high-end and modern feel of the automotive interior.

[0027] In some other embodiments of this utility model, the semi-transparent ink layer 4 is made of polyurethane-based semi-transparent ink. The beneficial effects of adopting the above technical solution are: polyurethane-based semi-transparent ink has good light transmittance, flexibility and adhesion, and its 30-60% light transmittance can work synergistically with the electroplating layer to make the film present a soft semi-transparent metallic effect, avoid the metallic luster being too dazzling, and improve visual comfort.

[0028] In some other embodiments of this utility model, the material of the hardness-enhancing layer 6 is a UV-curable polyurethane acrylate resin. The beneficial effects of adopting the above technical solution are: the UV-curable polyurethane acrylate resin has high hardness after curing, which can significantly improve the wear resistance and scratch resistance of the film surface, effectively resisting damage such as fingernail scratches and hard object collisions during daily use of automotive interiors, keeping the film surface smooth and flat; at the same time, this material has excellent resistance to yellowing and chemical corrosion, and can resist long-term erosion from light, humidity, heat, and chemical stains, preventing the film surface from yellowing and losing its gloss; in addition, the UV curing process has a fast curing speed, enabling efficient film production, and the bond between the cured resin and the acrylic layer is strong, making it less prone to delamination and peeling, ensuring long-term stability of the hardness enhancement effect, further improving the durability and user experience of the film.

[0029] The following describes a specific manufacturing process based on one embodiment of the present invention, with the steps as follows: 1. Protective layer pretreatment: Select a PET film with a thickness of 18μm as the protective layer substrate. First, put it into a plasma cleaner for surface activation treatment for 60 seconds to remove oil and impurities from the surface of the PET film and improve its surface adhesion.

[0030] 2. Hot melt adhesive layer lamination: Using an extrusion lamination process, EVA hot melt adhesive is heated to a molten state and then uniformly extruded and coated onto the lower surface of the pretreated PET film. The film is then laminated by pressure rollers and cooled to set, forming a hot melt adhesive layer with a thickness of 35μm.

[0031] 3. Electroplating layer preparation: The PET composite film with the hot melt adhesive layer is transferred to a vacuum sputtering coating equipment. Using chromium metal as the target material, vacuum sputtering is performed under the conditions of a vacuum degree of 5×10⁻³Pa, a sputtering power of 800W, and a substrate temperature of 60℃ to form a chromium metal electroplating layer with a thickness of 0.3μm on the surface of the PET film. During the sputtering process, the coating speed is controlled at 0.5m / min to ensure that the electroplating layer is uniform, dense, and has a consistent metallic luster.

[0032] 4. Semi-transparent ink coating: Select a polyurethane semi-transparent ink and coat it evenly on the surface of the electroplated layer. The coating thickness is controlled to be 10μm. After coating, send it to an oven for pre-curing treatment. The oven temperature is 80℃ and the treatment time is 3min to remove the solvent in the ink, initially fix the shape of the ink layer, and ensure that it adheres tightly to the electroplated layer.

[0033] 5. Acrylic layer lamination: Select an acrylic film with a thickness of 80μm. Before lamination, perform corona treatment on the surface of the acrylic film to increase its surface tension. Then, perform hot pressing lamination on the surface of the pre-cured semi-permeable ink layer.

[0034] 6. Preparation of hardness-enhancing layer and UV curing: UV-curable polyurethane acrylate resin is coated onto the surface of the acrylic layer using a micro-gravure coating process, with a coating thickness of 5μm; then the coated composite film is sent into a UV curing machine for curing. During the curing process, the substrate temperature is controlled to not exceed 50℃ to avoid deformation or performance damage of each functional layer due to high temperature.

[0035] 7. Post-processing and cutting: The film after all layers have been laminated and cured is fed into a cooling roller group to cool to room temperature. Then, it is cut into preset dimensions by a slitting machine. At the same time, the edges of the film are trimmed to obtain the finished automotive interior surface film.

[0036] The automotive interior surface film prepared by the above process in this embodiment has a tight bond between each layer and is free from defects such as delamination and bubbles. The hardness-enhancing layer, after UV curing, can reach a surface hardness of 4H and has excellent wear resistance. After 1000 cycles of rubbing with steel wool (load 500g), there are no obvious scratches on the surface. After the yellowing resistance test (1000h UV aging), the yellowing index is ≤1.5, which can maintain the appearance stability for a long time and fully meet the usage requirements of automotive interiors.

[0037] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A film for automotive interior surfaces, characterized in that, It includes a hot melt adhesive layer, a protective layer, an electroplating layer, a semi-transparent ink layer, an acrylic layer, and a hardness-enhancing layer, which are stacked sequentially from bottom to top; The thickness of the hot melt adhesive layer is 20-50 μm; The thickness of the protective layer is 12-25 μm; The thickness of the electroplated layer is 0.1-0.5 μm; The thickness of the semi-transparent ink layer is 5-15 μm, and the light transmittance is 30-60%. The thickness of the acrylic layer is 50-254 μm; The thickness of the hardness-enhancing layer is 3-30 μm.

2. The automotive interior surface film according to claim 1, characterized in that, The hot melt adhesive layer is made of EVA hot melt adhesive with a melting point of 80-120℃.

3. The automotive interior surface film according to claim 1, characterized in that, The protective layer is made of PET film.

4. The automotive interior surface film according to claim 1, characterized in that, The electroplated layer is made of chromium or indium selenide metal and is prepared using a vacuum sputtering process.

5. The automotive interior surface film according to claim 1, characterized in that, The semi-transparent ink layer is made of polyurethane-based semi-transparent ink.

6. The automotive interior surface film according to claim 1, characterized in that, The material of the hardness-enhancing layer is UV-curable polyurethane acrylate resin.

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