Electroluminescent paint for interior and exterior trim of automobiles and preparation method thereof

Abstract

The present invention provides an electroluminescent paint for automotive interior and exterior trim. The paint is applied to the front or back of a substrate, the substrate having a luminescent region and a positive-negative boundary region including a surrounding portion and two extensions. The composite luminescent coating comprises an electrode layer, a luminescent layer, an insulating layer, and a conductive layer arranged sequentially along the visual direction. The electrode layer is fabricated in a region separated from the extensions and excluding all regions between the two extensions; the luminescent layer is fabricated in the luminescent region; the insulating layer is fabricated in all regions; and the conductive layer is fabricated in all regions except the positive-negative boundary region. The present invention also provides a corresponding preparation method. The electroluminescent paint of the present invention meets the luminescence requirements of automotive interior and exterior trim and avoids short circuits by disposing the fabrication regions for the electrode layer, the luminescent layer, and the conductive layer. Furthermore, the preparation method, which utilizes a transparent substrate backside construction process, effectively addresses the issues of weather resistance, stone chip resistance, and poor adhesion of the electroluminescent paint.

Description

Technical Field

[0001] The invention belongs to the field of interior and exterior trims of automobiles, and in particular relates to an electroluminescent paint used for interior and exterior trims of automobiles. Background Art

[0002] Currently, electroluminescent paint is very rare in the market. Its use has been tried in limited applications such as illuminated billboards and illuminated vests, but it has never been used in the automotive field. This is mainly due to the slow development of electroluminescent paint and the lack of a clear application method in the market. In addition, the traditional front application method performs poorly in tests such as weather resistance, stone chip resistance, and adhesion, making it difficult to meet mass production standards and unsuitable for the automotive field. Currently, there is no electroluminescent paint for automotive applications (e.g., interior or exterior car parts).

[0003] In order to fill the gap in electroluminescent technology in the automotive field, a process route for applying electroluminescent paint in the field of automotive interior and exterior decoration is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide an electroluminescent paint for interior and exterior trims of automobiles and a preparation method thereof, so as to fill the gap in electroluminescent technology in the automotive field.

[0005] In order to achieve the above-mentioned objectives, the present invention provides an electroluminescent paint for interior and exterior trim of an automobile, which is arranged on the front or back of a substrate and includes a composite luminescent coating, wherein the substrate has a luminescent area and a positive-negative boundary area located on the periphery of the luminescent area; the positive-negative boundary area includes a surrounding portion surrounding the luminescent area in the form of a notch and two extension portions arranged at both ends of the notch and extending outwardly parallel to each other to the edge of the substrate; the composite luminescent coating includes an electrode layer, a luminescent layer, an insulating layer and a conductive layer arranged in sequence along the visual direction; the production area of ​​the electrode layer is all areas on the substrate that are separated from the extension portion by a coverage threshold and exclude the two extension portions; the production area of ​​the luminescent layer is the luminescent area and all or part of the surrounding portion; the production area of ​​the insulating layer is all areas of the entire substrate; and the production area of ​​the conductive layer is all areas on the substrate except the positive-negative boundary area.

[0006] The front side of the composite luminescent coating is provided with a coating of conventional paint with a pattern.

[0007] The coating of conventional paint with a pattern is produced by spraying conventional paint and then laser engraving the desired luminous pattern; or the coating of conventional paint with a pattern is produced by making a conventional paint mask according to the desired luminous pattern and pasting it, then spraying conventional paint and then tearing off the conventional paint mask.

[0008] The composite luminescent coating is located on the back of a substrate, which is a transparent substrate, and a coating layer of conventional paint is located between the composite luminescent coating and the substrate.

[0009] The composite luminescent coating is located on the front side of the substrate, and the substrate is a transparent substrate or a non-transparent substrate.

[0010] The front side of the composite luminescent coating is provided with a transparent sealing layer.

[0011] The light emitting area is rectangular, and its periphery is located at a fixed distance outside the four sides of the desired light emitting pattern.

[0012] The electrode layer is made of a transparent electrically conductive material, and the thickness of the electrode layer is 0.03-0.1 mm; the light-emitting layer is made of an electroluminescent material, and the thickness of the light-emitting layer is 0.03-0.1 mm; the insulating layer is made of a metal material, and the thickness of the conductive layer is 0.07-0.15 mm.

[0013] In another aspect, the present invention provides a method for preparing an electroluminescent paint for interior and exterior trim of an automobile, comprising:

[0014] S1: On the back side of the substrate, the size of the light-emitting area is determined according to the desired light-emitting pattern, and a coating of conventional paint with the pattern is prepared; a positive-negative polarity boundary region is predetermined around the periphery of the light-emitting area, the positive-negative polarity boundary region comprising a surrounding portion with a notch surrounding the light-emitting area and two extension portions provided at both ends of the notch and extending outwardly in parallel to the edge of the substrate;

[0015] S2: manufacturing a first mask for covering the two epitaxial portions and the space between the two epitaxial portions according to the positive and negative electrode boundary region;

[0016] S3: forming an electrode layer, so that the electrode layer is formed in an area spaced apart from the epitaxial portion by a coverage threshold and all areas on the substrate between the two epitaxial portions are removed;

[0017] S4: removing the first mask;

[0018] S5: preparing a second mask for shielding all areas except the light-emitting area and all or part of the surrounding portion;

[0019] S6: forming a light-emitting layer so that the forming area of ​​the light-emitting layer is the light-emitting area and all or part of the surrounding portion;

[0020] S7: removing the second mask;

[0021] S8: forming an insulating layer so that the forming area of ​​the insulating layer covers all areas of the entire substrate;

[0022] S9: manufacturing a positive and negative electrode boundary mask according to the positive and negative electrode boundary area;

[0023] S10: forming a conductive layer so that the conductive layer is formed in an area covering all areas on the substrate except the positive and negative electrode boundary area;

[0024] S11: removing the positive and negative electrode boundary mask;

[0025] S12: connecting two conductive areas of the conductive layer separated from each other to the positive electrode and the negative electrode of the power supply respectively, so as to turn on the power and detect the luminous effect.

[0026] In another aspect, the present invention provides a method for preparing an electroluminescent paint for interior and exterior trim of an automobile, comprising:

[0027] S1: On the front surface of the substrate, the size of the light-emitting area is determined according to the desired light-emitting pattern; a positive-negative boundary region is pre-determined on the periphery of the light-emitting area, the positive-negative boundary region comprising a surrounding portion with a notch surrounding the light-emitting area and two extension portions provided at both ends of the notch and extending outwardly parallel to each other to the edge of the substrate;

[0028] S2: making a positive and negative electrode boundary mask according to the positive and negative electrode boundary area;

[0029] S3: forming a conductive layer so that the conductive layer is formed in an area covering all areas on the substrate except the boundary area between the positive and negative electrodes;

[0030] S4: remove the positive and negative electrode boundary mask;

[0031] S5: forming an insulating layer so that the forming area of ​​the insulating layer covers all areas of the entire substrate;

[0032] S6: preparing a second mask for shielding all areas except the light-emitting area and all or part of the surrounding portion;

[0033] S7: forming a light-emitting layer, so that the forming area of ​​the light-emitting layer is the light-emitting area and all or part of the surrounding portion;

[0034] S8: removing the second mask;

[0035] S9: making a first mask for covering the two epitaxial portions and the space between the two epitaxial portions;

[0036] S10: forming an electrode layer, so that the formation area of ​​the electrode layer is spaced apart from the epitaxial portion by a coverage threshold and all areas on the substrate between the two epitaxial portions are removed;

[0037] S11: removing the first mask;

[0038] S12: connecting two conductive areas of the conductive layer separated from each other to the positive and negative electrodes of a power source respectively, so as to power on and detect a luminous effect;

[0039] S13: Make a coat of regular paint with a pattern.

[0040] The electroluminescent paint for automotive interior and exterior trims of this invention represents the first application of this type of paint in the automotive industry. By arranging the production areas for the electrode layer, luminescent layer, and conductive layer, it meets the luminescence requirements of automotive interior and exterior trims while preventing short circuits. Furthermore, the application process and film thickness settings can meet the luminescence requirements of automotive interior and exterior trims, including ensuring adhesion between the paint and the substrate by setting a specific film thickness to meet the requirements of most automakers.

[0041] The present invention's method for preparing electroluminescent paint for automotive interior and exterior trim employs two application techniques: a front-side application process using a non-transparent / transparent substrate, and a back-side application process using a transparent substrate. The back-side application process, which is the opposite of the conventional front-side application process, is an international first. Because the substrate is positioned externally to the electroluminescent paint, it effectively addresses issues with weather resistance, stone chip resistance, and poor adhesion, offering significant advantages in durability and scalability. By optimizing application temperature, film thickness requirements, and substrate polishing to improve adhesion and weather resistance, the paint meets the product requirements of the automotive industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] like Figure 1-Figure 2 1 and 2 are schematic side views of the luminous area of ​​electroluminescent paint for interior and exterior trim of a car according to the first and second embodiments of the present invention, wherein: Figure 1 Specifically shows the backside construction of the transparent substrate. Figure 2 The application of transparent / non-transparent substrate front side is shown.

[0043] Figure 3 The flowchart of the method for preparing electroluminescent paint for interior and exterior trim of automobiles according to the third embodiment of the present invention shows the back surface construction of a transparent substrate.

[0044] Figure 4 The flowchart of the method for preparing electroluminescent paint for interior and exterior trim of automobiles according to the fourth embodiment of the present invention shows the construction on the front side of a transparent / non-transparent substrate.

[0045] Figures 5A-5E Yes Figure 3 The schematic diagram of each step of the preparation method of electroluminescent paint for interior and exterior trim of automobiles is shown, wherein: Figure 5A shows the size of the light emitting area, Figure 5B shows the production area of ​​the first mask and electrode layer, Figure 5C The second mask and the light-emitting layer production area are shown. Figure 5D Shows the production area of ​​the insulating layer, Figure 5E The production area of ​​the positive and negative electrode boundary mask and the conductive layer is shown.

[0046] Figures 6A-6D Yes Figure 4 The schematic diagram of each step of the preparation method of electroluminescent paint for interior and exterior trim of automobiles is shown, wherein: Figure 6A shows the size of the light emitting area, Figure 6B The production area of ​​the positive and negative electrode boundary mask and the conductive layer is shown. Figure 6C The second mask and the light-emitting layer production area are shown. Figure 6D The fabrication area of ​​the first mask and electrode layer is shown. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0048] like Figure 1-Figure 2 FIG2 is a schematic side view of a portion of the luminous area of ​​electroluminescent paint for interior and exterior trim of an automobile according to two embodiments of the present invention, wherein: Figure 1 Specifically shows the backside construction of the transparent substrate. Figure 2 The application of transparent / non-transparent substrate front side is shown.

[0049] like Figure 1-Figure 2 As shown in FIG. 1 , according to two embodiments of the present invention, the electroluminescent paint is disposed on the front or back of the substrate 10 and includes a composite luminescent coating. The electroluminescent paint further includes a coating of conventional paint with a pattern disposed on the front of the composite luminescent coating (not shown). The composite luminescent coating is as shown in FIG. Figure 1-Figure 2 As shown, it includes an electrode layer 1, a light-emitting layer 2, an insulating layer 3 and a conductive layer 4 arranged in sequence along the viewing direction 100. The front and back sides here are both the front and back sides relative to the viewing direction 100.

[0050] Among them, Figure 1As shown, according to a first embodiment of the present invention, the composite luminescent coating is located on the back side of a transparent substrate 10, thus achieving backside construction. A conventional paint coating (not shown) is provided between the composite luminescent coating and the substrate 10. The substrate 10 comprises a luminescent region 101 and a positive-negative boundary region located outside the luminescent region 101. The luminescent region is rectangular, and its periphery is located a fixed distance outside the desired luminescent pattern. The positive-negative boundary region comprises a surrounding portion 1021 that surrounds the luminescent region with a notch (i.e., a C-shaped notch), and two extension portions 1022 located at opposite ends of the notch and extending outwardly and parallel to the edge of the substrate 10. In this embodiment, the width of each of the surrounding portion 1021 and the extension portion 1022 is at least 3 mm, the outer side of the surrounding portion 1021 is at least 10 mm away from the edge of the substrate 10, and the distance between the two extension portions 1022 is at least 10 mm. The electrode layer 1 is formed over the entire substrate 10, separated from the epitaxial portion 1022 by a coverage threshold d1 and excluding the entire area between the two epitaxial portions 1022. The light-emitting layer 2 is formed over the entire light-emitting region and all or part of the surrounding portion 1021. The insulating layer 3 is formed over the entire substrate 10, or over the entire light-emitting region and all or part of the surrounding portion 1021. The conductive layer 4 is formed over the entire substrate 10, excluding the boundary region between the positive and negative electrodes.

[0051] like Figure 2 As shown, according to the second embodiment of the present invention, the composite luminescent coating is located on the front surface of a substrate 10, which can be a transparent substrate or a non-transparent substrate, thus achieving transparent / non-transparent substrate front-side construction. Furthermore, a transparent sealing layer 5 can also be provided on the front surface of the composite luminescent coating for both aesthetic and protective purposes.

[0052] The substrate 10 comprises a light-emitting region 101 and a positive-negative boundary region located outside the light-emitting region 101. The light-emitting region is rectangular, and its periphery is located a fixed distance outside the desired light-emitting pattern. The positive-negative boundary region includes a surrounding portion 1021 with a notch surrounding the light-emitting region, and two extensions 1022 located at either end of the notch and extending outwardly and parallel to each other to the edge of the substrate 10. The electrode layer 1 is fabricated on the entire substrate 10, separated by a coverage threshold from the extensions 1022 and excluding the area between the two extensions 1022. The light-emitting layer 2 is fabricated on the entire substrate 10 (and all or part of the surrounding portion 1021). The insulating layer 3 is fabricated on the entire substrate 10, or on the entire substrate 10 and all or part of the surrounding portion 1021. The conductive layer 4 is fabricated on the entire substrate 10, excluding the positive-negative boundary region. The sealing layer 5 is fabricated on the entire substrate 10.

[0053] In the above two embodiments, the substrate 10 refers to the insulating material to be constructed, and the transparent substrate refers to the transparent insulating material to be constructed. The transparent substrate includes transparent PC, glass, etc. The material of the electrode layer 1 is a transparent electrically conductive material, among which ITO (i.e. In2O3:Sn) is a commonly used transparent conductive material. A layer of 300-500nm thick ITO film usually has a thickness of 10 -4 The resistivity of Ωcm, the square resistance of ~5Ω, and the transparency of ~90%. The material of the light-emitting layer 2 is an electroluminescent material. The most important properties of the electroluminescent material include brightness (cd / m 2 ), efficiency (lm / W) and aging time (aging). Electroluminescent materials mainly include (1) ZnS:Mn; (2) SrS:Ce; (3) SrS:Cu and SrS:Ag,Cu; (4) ZnS doped with rare earth elements; (5) Thiogallates; (6) other alkaline earth metal sulfides; (7) oxides, etc. Any one or more. The material of the insulating layer 3 is required to have high dielectric strength and no pinhole phenomenon, wherein the dielectric strength is preferably greater than 2.6. What is important is not only the dielectric strength, but also the maximization of the charge density stored in the dielectric layer, so ε0, ε r 、E BD , where ε0 and ε r are the vacuum and relative permittivity, E BD The material of the conductive layer 4 can be silver liquid, aluminum liquid, copper liquid and other metal materials; the requirements for the metal material include low resistivity (and the resistivity is preferably greater than 1.7×10 -8 Omega), good adhesion performance, low mobility under strong electric field, and good patterning.

[0054] Third embodiment: Method for preparing electroluminescent paint for automobile interior and exterior trim using a transparent substrate backside construction process

[0055] The following is a detailed introduction to the preparation method of electroluminescent paint for interior and exterior trim of automobiles, taking "YFPO" as the luminous pattern, construction on the back of a transparent substrate, and laser engraving the pattern as an example.

[0056] like Figure 3 As shown, the preparation method of the electroluminescent paint for interior and exterior trim of an automobile adopts a transparent substrate backside construction process, specifically comprising the following steps:

[0057] Step S1: On the back side of the substrate 10, the size of the light-emitting area 101 is determined according to the desired light-emitting pattern, and a coating of conventional paint with a pattern is prepared; a positive-negative pole boundary area is pre-determined on the periphery of the light-emitting area 101, and the positive-negative pole boundary area includes a surrounding portion 1021 surrounding the light-emitting area in the form of a notch and two extension portions 1022 arranged at both ends of the notch and extending outward in parallel to each other to the edge of the substrate 10.

[0058] In this embodiment, the coating of conventional paint with a pattern is produced by spraying conventional paint and then laser engraving the desired luminous pattern.

[0059] Among them, the size requirements of the light-emitting area are as follows: Figure 5A As shown, the luminous area is rectangular, and its periphery is located a fixed distance outside the four sides of the desired luminous pattern, ensuring that the luminous pattern can be perfectly covered to avoid luminous dead angles. In this embodiment, the fixed distance is more than 5mm.

[0060] In this embodiment, the substrate 10 is a transparent substrate. The conventional paint here is not part of the composite luminescent coating, but is a paint commonly used for decorative and beautifying automobile exterior parts. The conventional paint does not need to be transparent. Its color and material are determined according to the needs of the vehicle manufacturer. There is no need to limit the material. It only needs to be able to adhere to the surface of the substrate and have good adhesion.

[0061] During laser engraving, the paint etched is not part of the composite luminescent coating, but rather conventional paint. In this example, the desired luminescent pattern is a "YFPO" pattern, so the laser engraving removes the conventional paint from the "YFPO" pattern. It should be noted that laser engraving has nothing to do with composite luminescent coatings. It simply involves engraving the desired light-transmitting pattern from a transparent substrate sprayed with color (i.e., conventional paint) to remove the conventional paint in the patterned area. The areas not intended to emit light remain covered with conventional paint, preventing light from passing through.

[0062] Step S2: Figure 5B As shown, a first mask 103 (masking) is formed based on the positive-negative boundary region to cover the two extension portions 1022 and the region between the two extension portions 1022, thereby shielding the positive electrode position of the conductive layer 4 and preventing the electrode layer 1 from covering the positive electrode position of the conductive layer 4. This ensures that the conductive layer 4 position is not contaminated by other coatings, making it easier to connect electricity to this position later.

[0063] The inner boundary position of the surrounding portion 1021 of the positive and negative electrode boundary mask 102 coincides with the outer boundary position of the light emitting area. The position between the extension portion 1022 is the position of the positive electrode (i.e., the + electrode position) of the conductive layer 4 to be set below. Therefore, the position of the first mask is as follows: Figure 5B As shown in the grid area in FIG, the coverage of the first mask 103 includes the extension 1022 of the positive-negative boundary mask 102, the area between the extension 1022, and also extends beyond the extension 1022 to a coverage threshold. This coverage threshold is typically greater than 3 mm, thereby ensuring that the electrode layer 1 does not cover the extension 1022 of the positive-negative boundary mask 102 or the area between the extension 1022. In this embodiment, the first mask 103 is a tape, generally a low-viscosity tape such as art demarcation tape, automotive spray masking tape, and flame-retardant tape. The material of the positive-negative boundary mask 102 is the same as that of the first mask 103.

[0064] Step S3: Make the electrode layer 1. The electrode layer 1 is made in the area except the first mask 103 (such as Figure 5B All areas other than the grid line area in FIG, that is, the production area of ​​the electrode layer 1 is spaced apart from the epitaxial portion 1022 by a coverage threshold and all areas on the substrate 10 are removed except for the two epitaxial portions 1022.

[0065] The thickness of electrode layer 1 is 0.03-0.1 mm. Electrode layer 1 is produced by spraying a coating and baking at 40°C-80°C for 5-20 minutes. In this embodiment, the thickness is preferably 0.05 mm. Light-emitting layer 2 is produced by spraying a coating and baking at 60°C for 10 minutes. Electrode layer 1 is made of a transparent, electrically conductive material, such as ITO (i.e., In2O3:Sn).

[0066] The main function of the electrode layer 1 is to form an electric field together with the conductive layer 4 .

[0067] Step S4: Remove Figure 5B The first mask 103 is shown in the grid line area;

[0068] Step S5: Prepare a second mask 104 (eg, Figure 5C shown);

[0069] The second mask 104 is used to determine the fabrication location of the light-emitting layer 2, thereby determining whether that area emits light. Since the second mask 104 is used to mask areas outside the light-emitting area, it is ensured that the paint of the light-emitting layer 2 is sprayed only in the light-emitting area. In this embodiment, the second mask 104 does not include the surrounding portion 1021 of the positive-negative electrode boundary area, or only includes a portion of the surrounding portion 1021. For example, the gap between the inner boundary of the second mask 104 and the outer edge of the positive-negative electrode boundary mask 102 is approximately 0.5-1 mm. Therefore, by including the surrounding portion 1021 of the positive-negative electrode boundary area in the second mask 104, problems such as insufficient light-emitting area and short circuits can be prevented.

[0070] Step S6: Fabricate the light-emitting layer 2. The main function of the light-emitting layer 2 is to emit light by electron collision under the action of an electric field. The fabrication area of ​​the light-emitting layer 2 is all areas outside the second mask 104. Therefore, the fabrication area of ​​the light-emitting layer 2 is the light-emitting area and all or part of the surrounding portion 1021.

[0071] The thickness of the luminescent layer 2 is 0.03-0.1 mm. The luminescent layer 2 is produced by spraying the paint of the luminescent layer 2 and baking it at 40°C-80°C for 5-20 minutes. In this embodiment, the thickness of the luminescent layer 2 is preferably 0.05 mm. The luminescent layer 2 is produced by spraying the paint of the luminescent layer 2 and baking it at 60°C for 10 minutes. The material of the luminescent layer 2 is an electroluminescent material. The most important properties of the electroluminescent material include brightness (cd / m 2 ), efficiency (lm / W) and aging time. Electroluminescent materials mainly include any one or more of (1) ZnS:Mn; (2) SrS:Ce; (3) SrS:Cu and SrS:Ag,Cu; (4) ZnS doped with rare earth elements; (5) Thiogallates; (6) other alkaline earth metal sulfides; (7) oxides, etc.

[0072] Step S7: removing the second mask 104 .

[0073] In this embodiment, the second mask 104 is a tape, and generally a low-viscosity tape can be selected, such as art demarcation tape, automotive spray masking tape, flame retardant tape, etc. Therefore, step S7 is to tear off the tape in the area of ​​the second mask 104;

[0074] Step S8: Make the insulating layer 3. The main function of the insulating layer 3 is insulation, so that an electric field is formed between the electrode layer 1 and the conductive layer 4. The making area of ​​the insulating layer 3 is as follows: Figure 5D The black box in FIG. 1 shows all areas of the entire substrate 10 .

[0075] The thickness of the insulating layer 3 is 0.07-0.15 mm, and the insulating layer 3 is produced by spraying the insulating layer 3 with paint and baking it at 40°C-80°C for 15-25 minutes. In this embodiment, the thickness of the insulating layer 3 is preferably 0.1 mm, and the insulating layer 3 is baked at 60°C for 20 minutes.

[0076] Step S9: Make the following according to the positive and negative electrode boundary area: Figure 5E The positive and negative electrode boundary mask 102 is shown;

[0077] Thus, the positive and negative electrode boundary line can be shielded to distinguish the positive and negative electrodes. The production area of ​​the positive and negative electrode boundary mask 102 is the positive and negative electrode boundary area, and the positive and negative electrode boundary area is as described above and as Figure 5D As shown by the dotted line in FIG, it includes a surrounding portion 1021 surrounding the light-emitting area in the form of a gap and two extension portions 1022 arranged at both ends of the gap and extending outwardly to the edge of the substrate 10 in parallel with each other.

[0078] In this embodiment, the positive and negative electrode boundary mask 102 is a tape, and generally a low-viscosity tape can be selected. Commonly used ones include art boundary tape, automotive spray masking tape, flame retardant tape, etc.

[0079] Step S10: forming a conductive layer 4; the main function of the conductive layer 4 is to form an electric field with the electrode layer 1. The conductive layer 4 is formed in all areas on the substrate 10 except the positive and negative electrode boundary area.

[0080] The conductive layer 4 has a thickness of 0.07-0.15 mm and is produced by spraying a paint coating on the conductive layer 4 and baking it at 40°C-80°C for 15-25 minutes. In this embodiment, the conductive layer 4 preferably has a thickness of 0.1 mm and is produced by baking it at 60°C for 20 minutes.

[0081] The positive and negative electrode boundary mask 102 is as follows Figure 5E As shown by the grid lines in , the conductive layer 4 thus obtained includes two conductive areas spaced apart from each other, wherein one conductive area is used to connect to the positive electrode of the power supply, and the other conductive area is used to connect to the negative electrode of the power supply.

[0082] Step S11: Remove the positive and negative electrode boundary mask 102 (ie Figure 5E Grid lines in );

[0083] In this embodiment, the positive and negative electrode boundary mask 102 is a tape, and generally a low-viscosity tape can be selected. Commonly used tapes include art boundary tape, automotive spray masking tape, flame retardant tape, etc. Therefore, step S11 is to tear off the tape in the area of ​​the positive and negative electrode boundary mask 102;

[0084] Step S12: Connect the two conductive areas of the conductive layer 4 that are separated from each other to the positive and negative poles of the power supply respectively, so as to power on and detect the luminous effect (the positive and negative poles can be swapped).

[0085] In this embodiment, the resistance of the conductive region connected to the negative pole of the power source must not exceed 60 ohms, and the resistance of the conductive region connected to the positive pole of the power source must not exceed 20 ohms. In contrast, electrode layer 1 is not directly connected to an external power source; only the two conductive regions of conductive layer 4 are connected to the positive and negative poles of the external power source.

[0086] Fourth embodiment: Method for preparing electroluminescent paint for interior and exterior trim of automobiles using transparent or non-transparent substrate front construction technology

[0087] like Figure 4 As shown, the preparation method of the electroluminescent paint for interior and exterior trim of an automobile adopts a transparent or non-transparent substrate front construction process, specifically comprising the following steps:

[0088] Step S1: On the front side of the substrate 10, the size of the light-emitting area 101 is determined according to the desired light-emitting pattern; a positive-negative pole boundary area is pre-determined on the periphery of the light-emitting area 101, and the positive-negative pole boundary area includes a surrounding portion 1021 surrounding the light-emitting area in the form of a notch and two extension portions 1022 arranged at both ends of the notch and extending outward in parallel to each other to the edge of the substrate 10.

[0089] The inner boundary position of the surrounding portion 1021 of the positive-negative electrode boundary mask 102 coincides with the outer boundary position of the light-emitting area.

[0090] Among them, the size requirements of the light-emitting area are as follows: Figure 6A As shown, the luminous area is rectangular, and its periphery is located a fixed distance outside the four sides of the desired luminous pattern, ensuring that the luminous pattern can be perfectly covered to avoid luminous dead angles. In this embodiment, the fixed distance is more than 5mm.

[0091] Step S2: making a positive-negative electrode boundary mask 102 according to the positive-negative electrode boundary area;

[0092] Thus, the positive and negative electrode boundary mask 102 can cover the positive and negative electrode boundary line and distinguish the positive and negative electrodes. Figure 6B As shown by the grid lines in FIG, it includes a surrounding portion 1021 surrounding the light-emitting area in the form of a gap and two extension portions 1022 provided at both ends of the gap and extending outwardly to the edge of the substrate 10 in parallel with each other.

[0093] In this embodiment, the positive and negative electrode boundary mask 102 is a tape, and generally a low-viscosity tape can be selected. Commonly used ones include art boundary tape, automotive spray masking tape, flame retardant tape, etc.

[0094] Step S3: fabricating a conductive layer 4; the main function of the conductive layer 4 is to form an electric field with the electrode layer 1. The fabrication area of ​​the conductive layer 4 is all areas on the substrate 10 except the boundary area between the positive and negative electrodes.

[0095] The conductive layer 4 has a thickness of 0.07-0.15 mm and is produced by spraying a paint coating on the conductive layer 4 and baking it at 40°C-80°C for 15-25 minutes. In this embodiment, the conductive layer 4 preferably has a thickness of 0.1 mm and is produced by baking it at 60°C for 20 minutes.

[0096] The positive and negative electrode boundary mask 102 is as follows Figure 6B As shown by the grid lines in , the conductive layer 4 thus obtained includes two conductive areas spaced apart from each other, wherein one conductive area is used to connect to the positive electrode of the power supply, and the other conductive area is used to connect to the negative electrode of the power supply.

[0097] Step S4: Remove the positive and negative electrode boundary mask 102 (ie Figure 6B Grid lines in );

[0098] In this embodiment, the positive and negative electrode boundary mask 102 is a tape, and generally a low-viscosity tape can be selected. Commonly used tapes include art boundary tape, automotive spray masking tape, flame retardant tape, etc. Therefore, step S11 is to tear off the tape in the area of ​​the positive and negative electrode boundary mask 102;

[0099] In step S4, it also includes: after taking out the positive and negative electrode boundary mask 102, grinding the boundary. There will be slight bulges at the boundary position, which is ground with 800-grit sandpaper; there will be bulges at the edge of the tape, which is ground to make the boundary smooth and beautiful.

[0100] Step S5: forming an insulating layer 3. The main function of the insulating layer 3 is insulation, so that an electric field is formed between the electrode layer 1 and the conductive layer 4. The insulating layer 3 is formed in the entire area of ​​the substrate 10.

[0101] The thickness of the insulating layer 3 is 0.07-0.15 mm, and the insulating layer 3 is produced by spraying the insulating layer 3 with paint and baking it at 40°C-80°C for 15-25 minutes. In this embodiment, the thickness of the insulating layer 3 is preferably 0.1 mm, and the insulating layer 3 is baked at 60°C for 20 minutes.

[0102] Step S6: Prepare a second mask 104 (eg, Figure 6C shown);

[0103] The second mask 104 is used to determine the fabrication location of the light-emitting layer 2, thereby determining whether that area emits light. Since the second mask 104 is used to mask areas other than the light-emitting area, the paint for the light-emitting layer 2 can be sprayed only in the light-emitting area. In this embodiment, the second mask 104 does not include the surrounding portion 1021 of the positive-negative electrode boundary, or only includes a portion of the surrounding portion 1021. For example, the gap between the inner edge of the second mask 104 and the outer edge of the positive-negative electrode boundary mask 102 is approximately 0.5-1 mm.

[0104] Step S7: fabricating the light emitting layer 2. The main function of the light emitting layer 2 is to emit light by electron collision under the action of an electric field. The fabrication area of ​​the light emitting layer 2 is all areas outside the second mask 104, that is, the light emitting area and all or part of the surrounding portion 1021.

[0105] The thickness of the luminescent layer 2 is 0.03-0.1 mm. The luminescent layer 2 is produced by spraying the paint of the luminescent layer 2 and baking it at 40°C-80°C for 5-20 minutes. In this embodiment, the thickness of the luminescent layer 2 is preferably 0.05 mm. The luminescent layer 2 is produced by spraying the paint of the luminescent layer 2 and baking it at 60°C for 10 minutes. The material of the luminescent layer 2 is an electroluminescent material. The most important properties of the electroluminescent material include brightness (cd / m 2 ), efficiency (lm / W) and aging time. Electroluminescent materials mainly include any one or more of (1) ZnS:Mn; (2) SrS:Ce; (3) SrS:Cu and SrS:Ag,Cu; (4) ZnS doped with rare earth elements; (5) Thiogallates; (6) other alkaline earth metal sulfides; (7) oxides, etc.

[0106] Step S8: Remove the second mask 104 (such as Figure 6C shown).

[0107] In this embodiment, the second mask 104 is a tape, and generally a low-viscosity tape can be selected, such as art demarcation tape, automotive spray masking tape, flame retardant tape, etc. Therefore, step S7 is to tear off the tape in the area of ​​the second mask 104;

[0108] Step S9: Figure 6D As shown, a first mask 103 (masking) is formed to cover the two extension portions 1022 and the space between the two extension portions 1022, thereby shielding the position of the positive electrode of the conductive layer 4 and preventing the electrode layer 1 from covering the position of the positive electrode of the conductive layer 4. This ensures that the position of the conductive layer 4 is not contaminated by other coatings, making it easier to connect electricity to this position later.

[0109] The inner boundary position of the surrounding portion 1021 of the positive and negative electrode boundary mask 102 coincides with the outer boundary position of the light emitting area. The position between the extension portion 1022 is the position of the positive electrode (i.e., the + electrode position) of the conductive layer 4 to be set below. Therefore, the position of the first mask is as follows: Figure 6D As shown in the grid area in FIG, the coverage of the first mask 103 includes the extension 1022 of the positive-negative boundary mask 102, the area between the extension 1022, and also extends beyond the extension 1022 to a coverage threshold. This coverage threshold is typically greater than 3 mm, thereby ensuring that the electrode layer 1 does not cover the extension 1022 of the positive-negative boundary mask 102 or the area between the extension 1022. In this embodiment, the first mask 103 is a tape, generally a low-viscosity tape such as art demarcation tape, automotive spray masking tape, and flame-retardant tape. The material of the positive-negative boundary mask 102 is the same as that of the first mask 103.

[0110] Step S10: Make the electrode layer 1. The electrode layer 1 is made in the area except the first mask 103 (such as Figure 6D All areas other than the grid line area in FIG, that is, the production area of ​​the electrode layer 1 is spaced apart from the epitaxial portion 1022 by a coverage threshold and all areas on the substrate 10 are removed except for the two epitaxial portions 1022.

[0111] The thickness of electrode layer 1 is 0.03-0.1 mm. Electrode layer 1 is produced by spraying a coating and baking at 40°C-80°C for 5-20 minutes. In this embodiment, the thickness is preferably 0.05 mm. Light-emitting layer 2 is produced by spraying a coating and baking at 60°C for 10 minutes. Electrode layer 1 is made of a transparent, electrically conductive material, such as ITO (i.e., In2O3:Sn).

[0112] The main function of the electrode layer 1 is to form an electric field together with the conductive layer 4 .

[0113] Step S11: Remove Figure 6D The first mask 103 is shown in the grid line area;

[0114] Step S12: Connect the two conductive areas of the conductive layer 4 that are separated from each other to the positive and negative poles of the power supply respectively, so as to power on and detect the luminous effect (the positive and negative poles can be swapped).

[0115] In this embodiment, the resistance of the conductive region connected to the negative pole of the power source must not exceed 60 ohms, and the resistance of the conductive region connected to the positive pole of the power source must not exceed 20 ohms. In contrast, electrode layer 1 is not directly connected to an external power source; only the two conductive regions of conductive layer 4 are connected to the positive and negative poles of the external power source.

[0116] Step S13: Producing a coating of conventional paint with a pattern.

[0117] In step S13, the coating of the conventional paint with the pattern is produced by a "button" patterning method.

[0118] In step S13, the coating of conventional paint with a pattern is produced by making a conventional paint mask according to the desired luminous pattern and sticking it, then spraying conventional paint, and then tearing off the conventional paint mask.

[0119] Conventional paint masks are also tape masks. In this embodiment, a specific letter (e.g., "YFPO") needs to be illuminated. Therefore, a conventional paint mask with the letter (e.g., "YFPO") is applied to the illuminated area to mask the desired lettering, leaving only the border for conventional paint application. Similarly, the laser engraving method for the desired illuminated pattern in the third embodiment also uses the "clip-on" method.

[0120] In this embodiment, the substrate 10 is a transparent or non-transparent substrate.

[0121] Conventional paint is not part of the composite luminescent coating, but rather a paint commonly used for decorative purposes on automotive exteriors. Its color and material are determined by the vehicle manufacturer's requirements; no material restrictions apply; it only needs to adhere to the substrate surface and exhibit good adhesion. Conventional paint is typically black to provide a higher obstruction effect.

[0122] In addition, the step S13 may further include: after removing the conventional paint mask, making a sealing layer 5 made of transparent varnish to achieve protection.

[0123] The varnish sprayed here is defined according to the appearance and performance requirements of the vehicle manufacturer. It is generally consistent with the performance of the transparent varnish sprayed on the plastic parts on the surface of the vehicle body, and plays an aesthetic and protective role.

[0124] In the present invention, the spraying of various paints is performed on the entire substrate 10, and shielding is achieved by using a mask.

[0125] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various variations can be made to the above embodiments of the present invention. For example, in the present invention, the spraying process can be replaced by a brushing process; the tapes used in various masks can be replaced by masking films, magic slices, covers, and other items that have a masking effect; the production of conventional paint coatings can use a "spraying" method instead of a "buttoning" method. For example, before spraying the paint on the conductive layer 4 / luminescent layer 2, a masking slice that only retains the outer part of the pattern frame is affixed, so that the production area of ​​the conductive layer 4 / luminescent layer 2 is only the part of the pattern that needs to be illuminated. All simple, equivalent changes and modifications made based on the claims and description of the present invention application fall within the scope of protection of the claims of the present invention. Anything not fully described in the present invention is conventional technical content.

Claims

1. An electroluminescent paint for interior and exterior trim of an automobile, which is arranged on the front or back of a substrate (10), characterized in that: The invention comprises a composite luminescent coating, wherein the substrate (10) has a luminescent region (101) and a positive-negative electrode boundary region located on the periphery of the luminescent region (101); the positive-negative electrode boundary region comprises a surrounding portion (1021) surrounding the luminescent region in the form of a gap and two extension portions (1022) arranged at both ends of the gap and extending outwardly to the edge of the substrate (10) in parallel with each other; the composite luminescent coating comprises an electrode layer (1), a luminescent layer (2), an insulating layer (3) and a conductive layer (4) arranged in sequence along the visual direction, the conductive layer (4) comprising two conductive electrodes separated from each other by the positive-negative electrode boundary region. The present invention relates to a method for manufacturing a substrate (10) having a conductive layer (1021) and a conductive layer (2022) having a conductive layer (1021) and a conductive layer (3021) connected to a positive electrode of a power supply, wherein one conductive region is connected to a negative electrode of a power supply, and the electrode layer (1) is not directly connected to the power supply; the manufacturing area of ​​the electrode layer (1) is all regions on the substrate (10) separated from the extension portion (1022) by a coverage threshold and excluding the two extension portions (1022); the manufacturing area of ​​the light-emitting layer (2) is the light-emitting region and all or part of the surrounding portion (1021); the manufacturing area of ​​the insulating layer (3) is all regions of the entire substrate (10); and the manufacturing area of ​​the conductive layer (4) is all regions on the substrate (10) except the positive and negative electrode boundary region.

2. The electroluminescent paint for interior and exterior trim of an automobile according to claim 1, characterized in that: The front side of the composite luminescent coating is provided with a coating of conventional paint with a pattern.

3. The electroluminescent paint for interior and exterior trim of an automobile according to claim 2, characterized in that: The coating of conventional paint with a pattern is produced by spraying conventional paint and then laser engraving the desired luminous pattern; or the coating of conventional paint with a pattern is produced by making a conventional paint mask according to the desired luminous pattern and pasting it, then spraying conventional paint and then tearing off the conventional paint mask.

4. The electroluminescent paint for interior and exterior trim of an automobile according to claim 2, characterized in that: The composite luminescent coating is located on the back of a substrate (10), the substrate (10) is a transparent substrate, and a coating of conventional paint is located between the composite luminescent coating and the substrate (10).

5. The electroluminescent paint for interior and exterior trim of an automobile according to claim 1 or 2, characterized in that: The composite luminescent coating is located on the front side of the substrate (10), and the substrate (10) is a transparent substrate or a non-transparent substrate.

6. The electroluminescent paint for interior and exterior trim of an automobile according to claim 5, characterized in that: A transparent sealing layer (5) is provided on the front side of the composite luminescent coating.

7. The electroluminescent paint for interior and exterior trim of an automobile according to claim 1, characterized in that: The light emitting area is rectangular, and its periphery is located at a fixed distance outside the four sides of the desired light emitting pattern.

8. The electroluminescent paint for interior and exterior trim of an automobile according to claim 1, characterized in that: The electrode layer (1) is made of a transparent electrically conductive material, and the thickness of the electrode layer (1) is 0.03-0.1 mm; the light-emitting layer (2) is made of an electroluminescent material, and the thickness of the light-emitting layer (2) is 0.03-0.1 mm; the insulating layer (3) is made of a metal material, and the thickness of the conductive layer (4) is 0.07-0.15 mm.

9. A method for preparing electroluminescent paint for interior and exterior trim of automobiles, characterized in that: include: Step S1: On the back of the substrate (10), the size of the light-emitting area (101) is determined according to the desired light-emitting pattern, and a coating of conventional paint with the pattern is prepared; a positive-negative boundary area is predetermined on the periphery of the light-emitting area (101), the positive-negative boundary area comprising a surrounding portion (1021) surrounding the light-emitting area in the form of a notch, and two extension portions (1022) provided at both ends of the notch and extending outwardly in parallel to the edge of the substrate (10); Step S2: producing a first mask (103) for covering the two extension portions (1022) and the space between the two extension portions (1022) according to the positive and negative electrode boundary region; Step S3: fabricating the electrode layer (1), such that the fabrication area of ​​the electrode layer (1) is spaced apart from the epitaxial portion (1022) by a coverage threshold and all areas on the substrate (10) between the two epitaxial portions (1022) are removed; Step S4: removing the first mask (103); Step S5: making a second mask (104) for shielding all areas except the light-emitting area and all or part of the surrounding portion (1021); Step S6: manufacturing the light-emitting layer (2), so that the manufacturing area of ​​the light-emitting layer (2) is the light-emitting area and all or part of the surrounding portion (1021); Step S7: removing the second mask (104); Step S8: manufacturing the insulating layer (3), so that the manufacturing area of ​​the insulating layer (3) is all areas of the entire substrate (10); Step S9: making a positive and negative electrode boundary mask (102) according to the positive and negative electrode boundary area; Step S10: manufacturing a conductive layer (4), so that the manufacturing area of ​​the conductive layer (4) is all areas on the substrate (10) except the positive and negative electrode boundary area; Step S11: removing the positive and negative electrode boundary mask (102); Step S12: connecting the two conductive areas of the conductive layer (4) separated from each other by the positive and negative electrode boundary area to the positive and negative electrodes of the power supply respectively, and the electrode layer (1) is not directly connected to the power supply, so as to detect the luminous effect by powering on.

10. A method for preparing electroluminescent paint for interior and exterior trim of automobiles, characterized in that: include: Step S1: On the front surface of the substrate (10), the size of the light-emitting region (101) is determined according to the desired light-emitting pattern; a positive-negative boundary region is predetermined on the periphery of the light-emitting region (101), the positive-negative boundary region comprising a surrounding portion (1021) surrounding the light-emitting region in the form of a notch, and two extension portions (1022) provided at both ends of the notch and extending outwardly in parallel to each other to the edge of the substrate (10); Step S2: making a positive and negative electrode boundary mask (102) according to the positive and negative electrode boundary area; Step S3: manufacturing a conductive layer (4), so that the manufacturing area of ​​the conductive layer (4) is all areas on the substrate (10) except the positive and negative electrode boundary area; Step S4: removing the positive and negative electrode boundary mask (102); Step S5: manufacturing the insulating layer (3), so that the manufacturing area of ​​the insulating layer (3) is all areas of the entire substrate (10); Step S6: making a second mask (104) for shielding all areas except the light-emitting area and all or part of the surrounding portion (1021); Step S7: manufacturing the light-emitting layer (2), so that the manufacturing area of ​​the light-emitting layer (2) is the light-emitting area and all or part of the surrounding portion (1021); Step S8: removing the second mask (104); Step S9: making a first mask (103) for covering the two epitaxial portions (1022) and the space between the two epitaxial portions (1022); Step S10: fabricating the electrode layer (1), such that the fabrication area of ​​the electrode layer (1) is spaced apart from the epitaxial portion (1022) by a coverage threshold and all areas on the substrate (10) between the two epitaxial portions (1022) are removed; Step S11: removing the first mask (103); Step S12: connecting the two conductive areas of the conductive layer (4) separated from each other by the positive and negative electrode boundary area to the positive and negative electrodes of the power supply respectively, and the electrode layer (1) is not directly connected to the power supply, so as to detect the luminous effect by powering on; Step S13: Producing a coating of conventional paint with a pattern.

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