Flexible luminous membrane and preparation method thereof

Abstract

The invention discloses a flexible light-emitting membrane and a preparation method thereof. The flexible light-emitting membrane comprises a varnish layer, a TPU layer, a light-transmitting colored paint layer, an ink pattern layer, an electroluminescent layer and a packaging layer which are sequentially arranged. When the electroluminescent layer emits light, light rays emit light with different colors after passing through the pattern layer, so that the exquisite degree of the light-emitting pattern is achieved. According to the flexible light-emitting membrane and the preparation method thereof, the flexible light-emitting membrane can emit light when powered on, presents different color patterns when emitting light and can be integrated with the background when not powered on, and the flexible light-emitting membrane has the advantages of being bendable, light in weight, simple in process, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, and in particular to a flexible luminous film and a preparation method thereof. Background Art

[0002] In recent years, with the continuous development and popularization of automobile technology, consumers' demand for intelligent and personalized automobiles has continued to increase. Among them, with the changes in the lighting form and layout of ambient lights, and the continuous introduction of technologies combined with plastic parts, luminous decorative parts have become popular among the public.

[0003] In the prior art, in order to make the decorative parts have a luminous effect, a translucent plastic part is generally combined with an LED light group placed in the shell to obtain a luminous effect, but this form of expression is single, usually only presenting a luminous band. For luminous decorative parts that can show patterns, the area that needs to be illuminated is first carved on the opaque plastic shell, and then an LED light is embedded in the back. When the power is turned on, only the carved area will emit light; however, this process is costly, requires more post-processing, and is cumbersome. Moreover, when luminous, the pattern area can only show the same color, and it is difficult to express more exquisite patterns in this form.

[0004] Therefore, it is necessary to provide a method for preparing a flexible luminous film, which, on the one hand, does not have so many complicated manufacturing steps and can be used in automobile interior decoration without any doubt, and is also suitable for automobile exterior decoration. On the other hand, it is flexible and can achieve high integration of components, so as to obtain a compact structure and a pleasing appearance. Summary of the invention

[0005] The purpose of the present invention is to provide a flexible luminous film and a preparation method thereof, which will emit light when powered on and present different color patterns when emitting light, and will blend into the background when not powered on. The flexible luminous film has the advantages of being bendable, light weight, simple process, and low cost.

[0006] The technical solution adopted by the present invention to solve the above problems is to provide a flexible luminous film, which comprises a varnish layer, a TPU layer, a light-transmitting color paint, a pattern layer, an electroluminescent layer and an encapsulation layer in sequence.

[0007] Furthermore, the varnish layer comprises a light-curing / thermo-curing acrylic resin and a modified resin thereof, and the varnish layer has a thickness of 6-8 um.

[0008] Furthermore, the light transmittance of the TPU layer is greater than 90%, and the thickness of the TPU layer is 80-150 um; the TPU layer includes polyether polyurethane, polyester polyurethane, polycaprolactone or polycarbon polyurethane.

[0009] Furthermore, the light-transmitting paint layer is a colored coating of polyurethane; the light transmittance of the light-transmitting paint layer is 1%-3%.

[0010] Furthermore, the light-transmitting color paint layer comprises, by weight:

[0011] Polyurethane 85-99 parts;

[0012] Additives 0.2-5 parts;

[0013] 0.1 to 2 parts of color paste.

[0014] Furthermore, the ink pattern layer is printed with a desired pattern by lithography or inkjet printing, and the ink used in the ink pattern layer is UV ink, which is cured under a UV lamp.

[0015] Furthermore, the electroluminescent element comprises a luminescent pigment layer, a dielectric layer, and front and back electrodes, and the front and back electrodes are flexible electrodes.

[0016] Furthermore, the encapsulation layer is ABS, PC, PMMA, PI or a blended material thereof.

[0017] In order to solve the above problems, the present invention also provides a method for preparing the above-mentioned flexible luminous film, which includes the following steps: S1: preparing a translucent paint; S2: evenly applying the translucent paint on the TPU film by a comma scraper, slit extrusion or anilox roller coating, and curing to form a translucent paint layer; S3: printing the required pattern on the translucent paint layer that has been cured into a film by lithography or inkjet printing, and UV curing to form an ink pattern layer; S4: evenly applying a layer of glue on the ink pattern layer and bonding it to the electroluminescent layer; S5: evenly applying varnish on the other side of the TPU film by a comma scraper, slit extrusion or anilox roller coating, and curing to form a varnish layer; S6: compounding the electroluminescent layer and the encapsulation layer to complete the encapsulation of the film.

[0018] Furthermore, the preparation process of the light-transmitting paint is as follows: first, 85 to 99 parts by weight of polyurethane are taken, stirred at room temperature, different color pastes are added to adjust the color, and auxiliary agents are added to the stirring kettle, and stirred thoroughly.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the flexible light-emitting film of the present invention, each layer of which is composited together to produce a flexible flat light-emitting display device, has a thickness of 200-900um, has multiple characteristics such as bendability, resistance to finger scratches, resistance to cosmetics, and resistance to sunscreen. It has a good power saving effect, with a power of 50 watts per square meter. The production process of the present invention is simple, the cost is low, and the production and production of the light-emitting display area is not limited. The present invention can present different color patterns when it emits light by printing, and can be applied to the fields of automotive interior and exterior decoration, indicator lights, clothing, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the flexible light-emitting film of the present invention;

[0021] Figure 2 The figure is a flow chart of the preparation of the flexible light-emitting film of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic structural diagram of the flexible light-emitting film of the present invention;

[0024] See also Figure 1 The flexible luminous film provided by the present invention comprises a varnish layer 1, a TPU layer 2, a light-transmitting color paint layer 3, an ink pattern layer 4, an electroluminescent layer 5 and an encapsulation layer 6 which are arranged in sequence.

[0025] The varnish layer 1 includes but is not limited to photocurable / thermocurable acrylic resin and modified resin thereof. The thickness of the modified resin after film formation is 6-8um. If the film thickness of the varnish layer is too thin, the yellowing resistance is reduced. If the film thickness of the varnish layer is too thick, the TPU layer will be corroded and its tensile properties will be affected. Therefore, the optimal thickness of the varnish layer after film formation is 6-8um, the tensile strength is greater than 15MPa, and the elongation at break is greater than 100%.

[0026] The tensile strength of the TPU layer 2 is greater than 35MPa, the elongation at break is greater than 350%, the UV blocking is greater than 90%, and the light transmittance is greater than 90%; the thickness of the TPU layer 2 is 80-150um; the TPU layer 2 includes but is not limited to polyether polyurethane, polyester polyurethane, polycaprolactone or polycarbon polyurethane.

[0027] The light-transmitting paint layer 3 is a colored coating of water-based polyurethane, the thickness of the coating after film formation is 30um, the tensile strength is greater than 35MPa, and the elongation at break is greater than 350%; the light-transmitting paint layer 3 is a flexible luminous film that has the ability to cover the pattern layer when it is not luminous, and the light transmittance of the light-transmitting paint layer is less than 3%, which means that it is difficult to see the pattern layer on the back under natural conditions. If the light transmittance is too high, it will not have a covering effect on the pattern; if the light transmittance is too low, the light will not be able to pass through, so the light transmittance is preferably 1%-3%; the color of the light-transmitting paint layer 3 can be adjusted to any color as needed.

[0028] The light-transmitting colored paint layer 3 comprises, by weight:

[0029] Polyurethane 85-99 parts;

[0030] Additives 0.2-5 parts;

[0031] 0.1 to 2 parts of color paste.

[0032] The ink pattern layer 4 is printed with a desired pattern by lithography or inkjet printing. The ink used in the ink pattern layer is UV ink, which is cured under a UV lamp and has a thickness of 12 um after curing. Due to the coating of the light-transmitting paint layer 3, the surface hydrophilicity is enhanced, which is easy for the ink to adhere to, and the stability of the ink area can be ensured.

[0033] The electroluminescent layer 5 is a luminescent material with electroluminescent properties that emits light when subjected to an alternating electric field. The electroluminescent layer refers to an electroluminescent element. An electroluminescent element generally includes a luminescent pigment layer, a dielectric layer, and front and back electrodes. Each layer is flexible and bending does not affect its luminescent performance. The thickness of the electroluminescent layer 5 is 300um.

[0034] The encapsulation layer 6 is ABS (acrylonitrile-styrene-butadiene copolymer), PC (polycarbonate), PMMA (polymethyl methacrylate), PI (polyimide) or a blended material thereof, and the encapsulation layer 6 has a thickness of 200 um, a tensile strength greater than 35 MPa, and an elongation at break greater than 50%.

[0035] Please continue to see Figure 2 The specific preparation method of the flexible light-emitting film of the present invention is as follows:

[0036] S1: preparing a light-transmitting paint; the preparation process of the light-transmitting paint is as follows: first, taking 85 to 99 parts by weight of polyurethane, stirring at room temperature, adding different color pastes to adjust the desired color, and adding additives to the stirring kettle, and stirring thoroughly;

[0037] S2: evenly coating the light-transmitting paint on the TPU film by a comma scraper, slit extrusion or anilox roller coating, and curing to form a light-transmitting paint layer 3;

[0038] S3: printing a desired pattern on the cured light-transmitting paint layer 3 by lithography or inkjet printing, and UV curing to form an ink pattern layer 4;

[0039] S4: evenly apply a layer of glue on the ink pattern layer 4 to fit the 300um thick electroluminescent layer 5;

[0040] S5: a layer of varnish is evenly coated on the other side of the TPU by a comma scraper, slit extrusion or anilox roller coating, and thermally cured to form a varnish layer 1;

[0041] S6: Compound the electroluminescent layer 5 with the 200 um thick encapsulation layer 6 to complete the encapsulation of the membrane.

[0042] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. A flexible light-emitting film, characterized in that: The invention comprises a varnish layer, a TPU layer, a light-transmitting color paint layer, an ink pattern layer, an electroluminescent layer and a packaging layer which are arranged in sequence.

2. The flexible light-emitting film according to claim 1, characterized in that: The varnish layer comprises light-curing / thermo-curing acrylic resin and modified resin thereof, and the thickness of the varnish layer is 6-8 um.

3. The flexible light-emitting film according to claim 1, characterized in that: The light transmittance of the TPU layer is greater than 90%, and the thickness of the TPU layer is 80-150 um; the TPU layer includes polyether polyurethane, polyester polyurethane, polycaprolactone or polycarbon polyurethane.

4. The flexible light-emitting film according to claim 1, characterized in that: The light-transmitting color paint layer is a colored coating of polyurethane; the light transmittance of the light-transmitting color paint layer is 1%-3%.

5. The light-transmitting colored paint layer according to claim 4, wherein the light-transmitting colored paint layer comprises, by weight: Polyurethane 85-99 parts; Additives 0.2 to 5 parts; 0.1 to 2 parts of color paste.

6. The flexible light-emitting film according to claim 1, characterized in that: The ink pattern layer is printed with a desired pattern by lithography or inkjet printing. The ink used in the ink pattern layer is UV ink, which is cured under a UV lamp.

7. The flexible light-emitting film according to claim 1, characterized in that: The electroluminescent element comprises a luminescent pigment layer, a dielectric layer, and front and back electrodes, wherein the front and back electrodes are flexible electrodes.

8. The flexible light-emitting film according to claim 1, characterized in that: The encapsulation layer is ABS, PC, PMMA, PI or a blended material thereof.

9. A method for preparing a flexible light-emitting film according to any one of claims 1 to 8, characterized in that: The steps include: S1: preparing light-transmitting paint; S2: uniformly coating a light-transmitting paint layer on the TPU film by means of a comma scraper, slit extrusion or anilox roller coating, and curing to form a light-transmitting paint layer; S3: Printing a desired pattern on the light-transmitting paint layer that has been cured into a film by lithography or inkjet printing, and UV curing to form an ink pattern layer; S4: evenly coating a layer of glue on the ink pattern layer to fit the electroluminescent layer; S5: The varnish is evenly coated on the other side of the TPU film by a comma scraper, slit extrusion or anilox roller coating, and cured to form a varnish layer; S6: Compounding the electroluminescent layer and the encapsulation layer to complete the encapsulation of the membrane.

10. The method for preparing the flexible light-emitting film according to claim 9, characterized in that: The preparation process of the light-transmitting colored paint is as follows: firstly, 85 to 99 parts by weight of polyurethane are taken, stirred at room temperature, different color pastes are added to adjust the color, and auxiliary agents are added to the stirring kettle, and stirred thoroughly and evenly.

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