Electroluminescent film and automobile decorating part

Abstract

The utility model discloses an electroluminescent film and an automobile decorating part, the electroluminescent film comprises a base film, the back of the base film is provided with an electroluminescent function layer, the electroluminescent function layer is provided with a high temperature resistant layer, and the high temperature resistant layer is provided with a first adhesive layer. By arranging the high-temperature-resistant layer and the adhesive layer on the electroluminescent film, when the automobile decorative part is subjected to injection molding, the influence of high temperature on the electroluminescent film can be isolated through the high-temperature-resistant layer, and the bonding acting force between the layers of the electroluminescent film and between the electroluminescent film and the base material is increased through the adhesive layer; the problem that the front surface and the back surface of the electroluminescent film fall off and are layered at high temperature when the automobile decorating part is subjected to high-temperature injection molding is well solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and in particular relates to an electroluminescent film and an automobile decorative part used for automobile luminous decoration. Background Art

[0002] Currently, there are a wide variety of luminous decorative products on the market. As these products are widely used in the field of sophisticated automotive decoration, existing automotive luminous decorations generally use a combination of ambient lighting and panels. Due to product structure limitations, this combination requires a large installation space, making it unfeasible in certain situations where space requirements cannot be met. Electroluminescence's unique light-emitting principle solves this spatial constraint and demonstrates its advantages in the specific conditions of automotive luminous decoration.

[0003] Existing electroluminescent decorative products used in automobiles are typically applied through a spray coating process, with the vehicle exterior serving as the substrate upon which the electroluminescent coating is applied. In non-automotive applications, these products are often used in billboards, signage, toys, and sports equipment. These products typically use polymer materials or films as a base film, and are applied through printing and spraying processes, providing only a decorative, luminescent effect.

[0004] Existing electroluminescent decorative products used in the field of fine automotive decoration have the following problems: 1. The electroluminescent material requires the car's body paint as a base spray carrier, which damages the car body and causes uneven paint film thickness in the spraying area, affecting the appearance quality; 2. Electroluminescent materials are particularly sensitive to humidity. Prolonged exposure to high humidity will seriously shorten the service life of the electroluminescent material; 3. Traditional TPU and PET films have low scratch resistance and high temperature resistance requirements, which cannot meet the stringent requirements of automotive operating conditions; 4. Electroluminescent decorative products have the problem of easy shedding and delamination of electroluminescent materials at high temperatures. Utility Model Content

[0005] The purpose of the utility model is to provide an electroluminescent film, which solves the problem that the electroluminescent film is easy to fall off and delaminate at high temperature.

[0006] Another object of the utility model is to provide an automobile decorative part.

[0007] The utility model is achieved through the following technical solutions:

[0008] An electroluminescent film comprises a base film, wherein an electroluminescent functional layer is arranged on the back of the base film, a high-temperature resistant layer is arranged on the electroluminescent functional layer, and a first adhesive layer is arranged on the high-temperature resistant layer.

[0009] In some embodiments, the thickness of the high temperature resistant layer is 0.05-0.10 mm.

[0010] In some embodiments, the electroluminescent functional layer includes an indium tin oxide film layer, a light-emitting layer, an insulating layer and a conductive silver paste layer arranged in sequence, a second adhesive layer is arranged between the indium tin oxide film layer, the light-emitting layer and the insulating layer, and a third adhesive layer is arranged between the conductive silver paste layer and the high temperature resistant layer.

[0011] In some embodiments, external interfaces are reserved on the indium tin oxide film layer and the conductive silver paste layer, and leads are provided on the external interfaces, and the leads are connected to the indium tin oxide film layer and the conductive silver paste layer, respectively.

[0012] In some embodiments, the lead is a resilient compressible spring pin.

[0013] In some embodiments, the compression amount of the spring pin of the lead is 2 mm.

[0014] In some embodiments, a decorative layer is further provided between the base film and the electroluminescent functional layer, and the decorative layer is a piano black decorative layer or a patterned decorative layer. A fourth adhesive layer is provided between the decorative layer and the base film.

[0015] In some embodiments, a semi-transparent light-shielding layer is further provided between the base film and the electroluminescent functional layer, and the semi-transparent light-shielding layer and the base film are connected via a fourth adhesive layer.

[0016] An automobile decorative part comprises a substrate and the electroluminescent film, wherein the electroluminescent film is arranged on the substrate via a first adhesive layer.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. By providing a high-temperature resistant layer and an adhesive layer on the electroluminescent film, the high-temperature resistant layer can isolate the influence of high temperature on the electroluminescent film during the injection molding of automotive decorative parts, and the adhesive layer can increase the bonding force between the layers of the electroluminescent film and between the electroluminescent film and the substrate, thus effectively solving the problem of easy peeling and delamination of the front and back sides of the electroluminescent film at high temperatures during high-temperature injection molding of automotive decorative parts.

[0019] 2. The use of leads to connect the electroluminescent film solves the problem of difficult injection molding wiring due to the electroluminescent film being too thin. In addition, by using a resilient compressible spring pin, the lead can have good contact with the electroluminescent functional layer, thereby ensuring the performance of automotive decorative parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of an automobile decorative part in an embodiment of the present utility model.

[0022] Among them: 01-base film, 02-fourth adhesive layer, 03-semi-transparent light-shielding layer, 04-decorative layer, 05-indium tin oxide (ITO) film layer, 06-luminescent layer, 07-second adhesive layer, 08-insulating layer, 09-conductive silver paste layer, 10-third adhesive layer, 11-high temperature resistant layer, 12-first adhesive layer, 13-substrate, 14-lead. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0024] It should be noted that, according to the actual installation position of the automobile decorative parts, the side of each layer structure in the automobile decorative parts facing outward is regarded as the front side, and conversely, the side of each layer structure facing inward is regarded as the back side; therefore, the side of the base film 01 facing outward and allowing light to be displayed is regarded as the front side of the base film 01, and conversely, the side of the base film 01 facing inward is regarded as the back side of the base film 01; the side of the electroluminescent film facing outward and allowing light to be displayed is regarded as the front side of the electroluminescent film, and conversely, the side of the electroluminescent film facing inward is regarded as the back side of the electroluminescent film.

[0025] Reference Figure 1 In some embodiments, the electroluminescent film includes a base film 01, on the back of which are sequentially arranged a fourth adhesive layer 02, a semi-transparent light-shielding layer 03, a decorative layer 04, an indium tin oxide (ITO) film layer 05, a light-emitting layer 06, a second adhesive layer 07, an insulating layer 08, a conductive silver paste layer 09, a third adhesive layer 10, a high-temperature resistant layer 11, and a first adhesive layer 12.

[0026] By arranging a high-temperature resistant layer and an adhesive layer on the electroluminescent film, the high-temperature resistant layer can isolate the influence of high temperature on the electroluminescent film during the injection molding of automobile decorative parts, and the adhesive layer can increase the bonding force between the layers of the electroluminescent film and between the electroluminescent film and the substrate, which effectively solves the problem of easy peeling and delamination of the front and back sides of the electroluminescent film at high temperature during high-temperature injection molding of automobile decorative parts.

[0027] Base Film 01 is a composite film co-extruded from polymethyl methacrylate (PMMA) and polycarbonate (PC). Its thickness ranges from 0.2mm to 0.3mm, and its surface hardness is 1H to 2H, reaching the hardness of a pencil. Its surface is scratch-resistant and heat-resistant, meeting the stringent requirements of automotive operating conditions. Using the base film as a carrier eliminates the problem of damaging the car body and affecting exterior light quality.

[0028] The fourth adhesive layer 02 has a thickness of 0.005-0.03 mm and is used to increase the adhesion between the base film 01 and the semi-transparent light shielding layer 03 .

[0029] The semi-transparent light-shielding layer 03 has a transmittance of 5% and a thickness of 0.02mm. When the car decorative parts are not illuminated or lit, they shield other coatings to achieve an aesthetic effect.

[0030] Decorative layer 04 is a piano black decorative layer or a patterned decorative layer with a thickness of 0.04 mm, which serves to present a high-gloss black decoration or a customized pattern decoration on the surface.

[0031] The thickness of the indium tin oxide (ITO) film layer 05 is 0.03 mm to 0.08 mm, and serves as the P pole or N pole of the electric field.

[0032] The luminous brightness of the light-emitting layer 06 is 60 cd / m 2 -90cd / m 2 , thickness is 0.03-0.08mm.

[0033] The thickness of the second adhesive layer 07 is 0.005-0.03 mm, and is used to increase the adhesion between the indium tin oxide (ITO) film layer 05 , the light emitting layer 06 and the insulating layer 08 .

[0034] The thickness of the insulating layer 08 is 0.08 mm to 0.12 mm, and serves to isolate the indium tin oxide (ITO) film layer 05 and the conductive silver paste layer 09 , thereby forming an electric field between the indium tin oxide (ITO) film layer 05 and the conductive silver paste layer 09 .

[0035] The thickness of the conductive silver paste layer 09 is 0.01-0.05 mm, and serves as the N pole or P pole of the electric field.

[0036] The thickness of the third adhesive layer 10 is 0.005-0.03 mm, and is used to increase the adhesion between the conductive silver paste layer 09 and the high temperature resistant layer 11 .

[0037] The thickness of the high-temperature resistant layer 11 is 0.05-0.10 mm. The high-temperature resistant layer 11 protects the fourth adhesive layer 02, the semi-transparent light-shielding bottom layer 03, the decorative layer 04, the indium tin oxide (ITO) film layer 05, the light-emitting layer 06, the second adhesive layer 07, the insulating layer 08, the conductive silver paste layer 09 and the third adhesive layer 10 from being melted, falling off or delaminated under the conditions of high temperature (270°C), high pressure (120 bar) and high speed (85%).

[0038] The first adhesive layer 12 has a thickness of 0.005-0.03 mm and is used to increase the adhesion between the high temperature resistant layer 11 and the substrate 13 .

[0039] In some embodiments, external interfaces are reserved on the indium tin oxide (ITO) film layer 05 and the conductive silver paste layer 09 , respectively. Leads 14 are provided on the external interfaces. The leads 14 are connected to the indium tin oxide (ITO) film layer 05 and the conductive silver paste layer 09 , respectively.

[0040] Lead 14 is a resilient, compressible spring pin with a compression depth of 2 mm. Using lead 14 to connect the electroluminescent film solves the problem of difficult injection molding connections caused by the thinness of the electroluminescent film. Furthermore, the use of the resilient, compressible spring pin ensures good contact between the lead and the electroluminescent functional layer, thereby ensuring the performance of the automotive decorative part.

[0041] A method for manufacturing an electroluminescent film, comprising:

[0042] Using the base film 01 as a printing carrier, the fourth adhesive layer 02 is printed on the back of the base film 01 using the screen printing technology;

[0043] The semi-transparent light-shielding bottom layer 03 is printed on the prepared fourth adhesive layer 02 using the screen printing technology;

[0044] The decorative layer 04 is printed on the semi-transparent light-shielding bottom layer 03 using screen printing technology;

[0045] An indium tin oxide (ITO) film layer 05 is printed on the prepared decorative layer 04 using a screen printing technique, and then the indium tin oxide (ITO) film layer 05 is plated using a physical vapor deposition (PVD) technique. An external connection interface is reserved on the plated indium tin oxide (ITO) film layer 05, and a lead 14 is provided on the external connection interface.

[0046] The light-emitting layer 06 is printed on the prepared indium tin oxide (ITO) film layer 05 using screen printing technology;

[0047] The second adhesive layer 07 is printed on the prepared light-emitting layer 06 using the screen printing technology;

[0048] The insulating layer 08 is printed on the prepared second adhesive layer 07 using the screen printing technology;

[0049] A conductive silver paste layer 09 is printed on the prepared insulating layer 08 using a screen printing technique, an external connection interface is reserved on the conductive silver paste layer 09, and a lead 14 is provided on the external connection interface;

[0050] A third adhesive layer 10 is printed on the prepared conductive silver paste layer 09 using a screen printing technique;

[0051] The high temperature resistant layer 11 is printed on the prepared third adhesive layer 10 using a screen printing technique;

[0052] The first adhesive layer 12 is printed on the prepared high-temperature resistant layer 11 using a screen printing technique to obtain a prepared electroluminescent film.

[0053] The fourth adhesive layer 02 is baked at a temperature of 90°C to 120°C for 10 min to 15 min;

[0054] The semi-transparent shading bottom layer 03 is baked at 90℃ for 30 minutes;

[0055] Decorative layer 04 is baked at 90°C for 30 minutes;

[0056] The indium tin oxide (ITO) film layer 05 is coated using physical vapor deposition technology (PVD), making the indium tin oxide (ITO) film layer 05 wear-resistant and corrosion-resistant, extending its service life;

[0057] The light-emitting layer 06 is baked at 90°C for 10-15 minutes;

[0058] The second adhesive layer 07 is baked at a temperature of 90°C to 120°C for 10 min to 15 min;

[0059] Insulation layer 08 is baked at 90°C for 10-15 minutes;

[0060] The conductive silver paste layer 09 was printed twice. The first printing was baked at 90°C for 10 minutes, and the second printing was baked at 90°C for 30 minutes.

[0061] The third adhesive layer 10 is baked at a temperature of 90°C to 120°C for 10 min to 15 min;

[0062] The high-temperature resistant layer 11 is printed with a total of 8 layers and is made of polycarbonate (PC) or resin (ABS) material. During the injection molding process, the high-temperature resistant layer 11 protects the fourth adhesive layer 02, the semi-transparent light-shielding layer 03, the decorative layer 04, the indium tin oxide (ITO) film layer 05, the light-emitting layer 06, the second adhesive layer 07, the insulating layer 08, the conductive silver paste layer 09, and the third adhesive layer 10 from melting under high temperature (270°C), high pressure (120 bar), and high-speed (85%) filling. The high-temperature resistant layer 11 has a good thermal insulation effect.

[0063] The first adhesive layer 12 is baked at a temperature of 90°C to 120°C for 10 min to 15 min;

[0064] The use of screen printing technology makes the overall thickness of the electroluminescent film uniform and the gloss uniform, avoiding the problem of uneven lighting caused by gaps or wrinkles, making the lighting effect consistent, and having strong light resistance and three-dimensional effect.

[0065] In some embodiments, reference Figure 1 , is an automobile decorative part, which adopts the electroluminescent film in the above embodiment, and the electroluminescent film is arranged on a substrate 13 through a first adhesive layer 12.

[0066] The substrate 13 is made of polycarbonate (PC) or resin (ABS) material, and has a thickness of 2.5 mm. It is used to encapsulate the base film 01, the fourth adhesive layer 02, the semi-transparent shielding layer 03, the decorative layer 04, the indium tin oxide (ITO) film layer 05, the light-emitting layer 06, the second adhesive layer 07, the insulating layer 08, the conductive silver paste layer 09, the third adhesive layer 10, the high-temperature resistant layer 11, and the first adhesive layer 12 to prevent the electroluminescent material from being exposed to a high-temperature and high-humidity environment for a long time, which may affect the service life of the electroluminescent material.

[0067] The automotive decorative part of this embodiment has a laminated structure with a total thickness of 3mm-3.3mm. The overall structure is small in size, occupies little space, is lightweight, has a uniform luminous effect, has a high-quality appearance, and is resistant to high temperatures. Under conditions of high temperature (270°C), high pressure (120 bar), and high speed (85%), the front and back of the automotive decorative part will not fall off or delaminate.

[0068] The manufacturing method of automobile decorative parts includes:

[0069] Using the in-mold molding (IML) process, under the conditions of high temperature (270°C), high pressure (120 bar) and high speed (85%), the substrate 13 is filled into the back of the prepared electroluminescent film. After cooling, the substrate 13 and the electroluminescent film are fused together to form a whole.

[0070] The substrate 13 is filled into the back of the prepared electroluminescent film using an in-mold molding (IML) process, so that the substrate 13 and the electroluminescent film are injection-molded into a whole without the need for assembly. The electroluminescent film has good sealing properties, so that the electroluminescent material does not need to be exposed to a high temperature and high humidity environment for a long time to emit light, solving the problem that the service life of the electroluminescent material will be seriously shortened when emitting light under high temperature and high humidity.

[0071] The automotive decorative parts manufactured using the above manufacturing method have a laminated structure, are thin, have a small overall structure volume, occupy less space, are light in weight, have a uniform luminous effect, have a high-quality appearance, are scratch-resistant and high-temperature resistant, and can achieve 3D free stretching, ensuring that the printed layer does not break, short-circuit, or leak electricity under extreme conditions. It also has a certain mechanical strength and can be flexibly arranged at the required position of the car, thereby achieving mass promotion and application.

[0072] The working principle of the automobile decoration part after power is turned on in this embodiment:

[0073] An alternating current with a voltage of 100 volts and a frequency of 400 Hz to 1800 Hz is connected between the lead 14 on the indium tin oxide (ITO) film layer 05 of the automotive decorative part and the lead 14 on the conductive silver paste layer 09. After the alternating current is connected between the lead 14 on the indium tin oxide (ITO) film layer 05 of the automotive decorative part and the lead 14 on the conductive silver paste layer 09, a closed circuit is formed between the indium tin oxide (ITO) film layer 05 and the conductive silver paste layer 09, forming an electric field. Electrons in the electric field jump between the P pole and the N pole. The jumped electrons collide with the luminescent material in the luminescent layer 06 to generate light. The light is displayed through the front side of the base film 01, thereby realizing the luminescence of the automotive decorative part.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention falls within the scope of protection of the present invention.

Claims

1. An electroluminescent film, characterized in that: The invention comprises a base film, wherein an electroluminescent functional layer is arranged on the back of the base film, a high temperature resistant layer is arranged on the electroluminescent functional layer, and a first adhesive layer is arranged on the high temperature resistant layer.

2. The electroluminescent film according to claim 1, wherein: The thickness of the high temperature resistant layer is 0.05-0.10 mm.

3. The electroluminescent film according to claim 1, wherein: The electroluminescent functional layer includes an indium tin oxide film layer, a luminescent layer, an insulating layer and a conductive silver paste layer arranged in sequence. A second adhesive layer is arranged between the indium tin oxide film layer, the luminescent layer and the insulating layer, and a third adhesive layer is arranged between the conductive silver paste layer and the high temperature resistant layer.

4. The electroluminescent film according to claim 3, wherein: External connection interfaces are reserved on the indium tin oxide film layer and the conductive silver paste layer respectively. Leads are provided on the external connection interfaces respectively. The leads are connected to the indium tin oxide film layer and the conductive silver paste layer respectively.

5. The electroluminescent film according to claim 4, characterized in that: The lead is a resilient compressible elastic needle.

6. The electroluminescent film according to claim 5, characterized in that: The compression amount of the spring pin of the lead is 2 mm.

7. The electroluminescent film according to claim 1, wherein: A decorative layer is further provided between the base film and the electroluminescent functional layer. The decorative layer is a piano black decorative layer or a patterned decorative layer. A fourth adhesive layer is provided between the decorative layer and the base film.

8. The electroluminescent film according to claim 7, characterized in that: A semi-transparent light-shielding layer is further provided between the base film and the electroluminescent functional layer, and the semi-transparent light-shielding layer and the base film are connected via a fourth adhesive layer.

9. An automobile decorative part, characterized in that: The invention comprises a substrate and the electroluminescent film according to any one of claims 1 to 8, wherein the electroluminescent film is arranged on the substrate via a first adhesive layer.

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