Use of a photocured material in security indication or metal detection and method for security indication and metal detection

Abstract

The application discloses an application of a light-cured material in safety indication or metal flaw detection and a safety indication and metal flaw detection method, and the light-cured material is prepared by uniformly mixing raw materials including an organic fluorescent dye and a light-cured glue; the organic fluorescent dye is a mixture of one or more of quinacridone, acridine yellow, acridine yellow G, acridine yellow hydrochloride, sulfuric acid proflavine, acridine orange, acridone, ethidium bromide and 9-aminoacridine; the light-cured glue is a mixture of one or more of UV drop glue D-606, ultraviolet curing adhesive 3491, ultraviolet curing adhesive YY1181, V3218 and ultraviolet curing adhesive 3492; or, the organic fluorescent dye is a mixture of one or more of acridine yellow, sulfuric acid proflavine, acridine orange and 9-aminoacridine, and the light-cured glue is V3018. The light-cured material can emit afterglow under white light excitation after curing, and can be applied to large-area safety indication and metal flaw detection.

Description

Technical Field

[0001] The present invention relates to the technical field of organic long afterglow materials, and in particular to an application of a light-curing material in safety indication or metal flaw detection and a method for safety indication and metal flaw detection. Background Art

[0002] Organic long-afterglow materials have the advantages of low price, simple synthesis, good biocompatibility and easy modification of functional groups, which have attracted widespread attention from scientific researchers. At present, many organic small molecules with long-afterglow luminescence properties have been prepared and are widely used in three-dimensional display, anti-counterfeiting and information encryption, as well as biological imaging and other fields.

[0003] Among them, afterglow stimulated by visible light is particularly suitable for applications such as display, information encryption, and lighting equipment. However, this method usually requires complex molecular design and chemical synthesis, which hinders researchers from conducting deeper exploration. Commercial organic dyes have attracted much attention as luminophores because of their rich variety and low price. Many commercial fluorescent dyes, such as acridine and its derivatives, can help absorb light in the visible light region due to their charge transfer state characteristics, but often exhibit very weak luminescence in the solid state; in addition, the diversity of the molecular structure of commercial organic dyes poses a challenge to finding a universal and convenient material composite strategy to induce its long afterglow phenomenon. This challenge prompted us to develop a universal strategy to achieve afterglow emission of acridine and its derivatives under the excitation of ultraviolet or visible light, thereby expanding the application scenarios of the luminescence function of these dye molecules.

[0004] Polymer curing methods, such as photocuring and thermal curing, have been shown to effectively induce long-lasting fluorescence. For example, Chinese patent application publication number CN116768489A discloses a method for preparing a pure organic fluorescent long-lasting film excited by visible light. The method comprises: preparing a host solution using a polyhydroxy polymer matrix material and a solvent; preparing a guest solution using fluorescent dye molecules and a solvent; preparing a target solution using a mixture of the host and guest solutions; and dripping the target solution onto a glass slide to remove the solvent from the target solution, thereby obtaining a pure organic fluorescent long-lasting film excited by visible light. The polyhydroxy polymer matrix material and the fluorescent dye molecules form hydrogen bonds. The resulting film has applications in color-tunable lighting sources, industrial product manufacturing, and anti-counterfeiting labels. However, the process is complex, and the film-forming method is not suitable for applications in metal flaw detection and other areas. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to simply perform safety indication and metal flaw detection.

[0006] The present invention solves the above technical problems through the following technical means:

[0007] A light-curing material is used in safety indication or metal flaw detection, wherein the light-curing material is formed by uniformly mixing raw materials including an organic fluorescent dye and a light-curing adhesive;

[0008] The organic fluorescent dye is a mixture of one or more of quinacridone, acridinium yellow, acridinium yellow G, acridinium yellow hydrochloride, proflavine sulfate, acridinium orange, acridone, ethidium bromide, and 9-aminoacridine; the light-curing adhesive is a mixture of one or more of UV glue D-606, UV curing adhesive 3491, UV curing adhesive YY1181, V3218, and UV curing adhesive 3492;

[0009] Alternatively, the organic fluorescent dye is a mixture of one or more of acridinium yellow, proflavine sulfate, acridinium orange, and 9-aminoacridine, and the light-curing adhesive is V3018.

[0010] Preferably, the UV curing adhesive 3491 is from Henkel Loctite (China) Co., Ltd. AA3491, UV curing adhesive 3491 of Guangdong Youyang New Materials Co., Ltd. or a mixture of two thereof; the UV curing adhesive 3492 is a UV curing adhesive of Henkel Loctite (China) Co., Ltd. AA3492, UV curing adhesive 3492 of Guangdong Youyang New Materials Co., Ltd., or a mixture of two thereof.

[0011] Preferably, the UV glue D-606 comes from Foshan Jinggu Adhesive Co., Ltd., the UV curing adhesive YY1181 comes from Guangdong Youyang New Materials Co., Ltd., and the V3218 comes from Dongguan Lelai Adhesive Products Co., Ltd.

[0012] Preferably, the mass ratio of the light-curing adhesive to the organic fluorescent dye is 300-40000:1.

[0013] Preferably, the raw material further comprises a solvent, and the usage ratio of the organic fluorescent dye to the solvent is 1-5 mg: 1-15 ml.

[0014] Preferably, the solvent is ethanol.

[0015] The present invention also proposes a metal flaw detection method, comprising the following steps: applying the photocurable material on a metal surface, wiping off excess solution on the metal surface, curing with ultraviolet light, irradiating the metal surface with a white light lamp, and judging the position and size of the defect by afterglow. When an open defect exists on the metal surface, the open defect emits a long afterglow, and when no open defect exists on the metal surface, no long afterglow is emitted.

[0016] Preferably, an ultraviolet lamp with a wavelength of 365 nm and a power of 15 W is used for curing for 20 to 40 seconds, and a white light lamp is used for irradiation for 3 seconds.

[0017] Preferably, the excess solution on the metal surface is wiped off to evaporate the solvent, and then the coating is cured using ultraviolet light.

[0018] The present invention also proposes a method for using the photocurable material for safety indication, comprising the following steps: applying the photocurable material on the surface of a substrate, curing it with ultraviolet light, irradiating it with a white light lamp for excitation, and observing afterglow on the surface of the substrate after turning off the excitation light source.

[0019] Preferably, the substrate is a car cover or a safety sign.

[0020] The advantages of the present invention are:

[0021] (1) The material obtained by mixing traditional fluorescent dyes and light-curing adhesives can emit afterglow under white light excitation after being cured under ultraviolet light, and can be used for large-area safety indication;

[0022] (2) After photocuring, the photocurable material of the present invention can produce a smooth coating with good and stable afterglow performance. The coating does not require any heating process and the conditions are mild and non-harsh. This will be very beneficial for the application of LPL materials in various scenarios. The photocurable material can be used in the field of metal flaw detection without damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Macroscopic LPL images of the coating obtained in Example 1 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0024] Figure 2 Macroscopic LPL images of the coating obtained in Example 2 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0025] Figure 3 Macroscopic LPL images of the coating obtained in Example 3 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0026] Figure 4 Macroscopic LPL images of the coating obtained in Example 4 of the present invention at room temperature (from left to right: during white light excitation, 1s after the white light is turned off, and 3s after the white light is turned off);

[0027] Figure 5 Macroscopic LPL images of the coating obtained in Example 5 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0028] Figure 6 Macroscopic LPL images of the coating obtained in Example 41 of the present invention at room temperature (from left to right: during white light excitation and 1 second after the white light lamp is turned off);

[0029] Figure 7 Macroscopic LPL images of the coating obtained in Example 6 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0030] Figure 8 Macroscopic LPL images of the coating obtained in Example 7 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0031] Figure 9 Macroscopic LPL images of the coating obtained in Example 8 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0032] Figure 10 Macroscopic LPL images of the coating obtained in Example 9 of the present invention at room temperature (from left to right: during white light excitation, 1 second after the white light is turned off, and 3 seconds after the white light is turned off);

[0033] Figure 11 Macroscopic LPL images of the coating obtained in Example 10 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0034] Figure 12 Macroscopic LPL images of the coating obtained in Example 11 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0035] Figure 13 Macroscopic LPL images of the coating obtained in Example 12 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0036] Figure 14 Macroscopic LPL images of the coating obtained in Example 13 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0037] Figure 15 Macroscopic LPL images of the coating obtained in Example 14 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 3 seconds after turning off the white light);

[0038] Figure 16Macroscopic LPL images of the coating obtained in Example 15 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0039] Figure 17 Macroscopic LPL images of the coating obtained in Example 16 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0040] Figure 18 Macroscopic LPL images of the coating obtained in Example 17 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0041] Figure 19 Macroscopic LPL images of the coating obtained in Example 18 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0042] Figure 20 Macroscopic LPL images of the coating obtained in Example 19 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 3 seconds after turning off the white light);

[0043] Figure 21 Macroscopic LPL images of the coating obtained in Example 20 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 4 seconds after turning off the white light);

[0044] Figure 22 Macroscopic LPL images of the coating obtained in Example 42 of the present invention at room temperature (from left to right: during white light excitation and 1 second after the white light lamp is turned off);

[0045] Figure 23 Macroscopic LPL images of the coating obtained in Example 21 of the present invention at room temperature (from left to right: during white light excitation, 1s, and 2s after the white light is turned off);

[0046] Figure 24 Macroscopic LPL images of the coating obtained in Example 22 of the present invention at room temperature (from left to right: during white light excitation, 1s, and 2s after the white light is turned off);

[0047] Figure 25 Macroscopic LPL images of the coating obtained in Example 23 of the present invention at room temperature (from left to right: during white light excitation, 1s, and 2s after the white light is turned off);

[0048] Figure 26 Macroscopic LPL images of the coating obtained in Example 24 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 2 seconds after the white light is turned off);

[0049] Figure 27 Macroscopic LPL images of the coating obtained in Example 25 of the present invention at room temperature (from left to right: during white light excitation, 1s, and 2s after the white light is turned off);

[0050] Figure 28 Macroscopic LPL images of the coating obtained in Example 43 of the present invention at room temperature (from left to right: during white light excitation and 1 second after the white light lamp is turned off);

[0051] Figure 29 This is the attenuation spectrum of the afterglow performance of the coating obtained in Example 26 of the present invention;

[0052] Figure 30 Macroscopic LPL images of the coating obtained in Example 27 of the present invention at room temperature (from left to right: during white light excitation and 1 second after the white light lamp is turned off);

[0053] Figure 31 This is the attenuation spectrum of the afterglow performance of the coating obtained in Example 31 of the present invention;

[0054] Figure 32 This is the attenuation spectrum of the afterglow performance of the coating obtained in Example 32 of the present invention;

[0055] Figure 33 Macroscopic LPL images of the coating obtained in Example 36 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 3 seconds after turning off the white light);

[0056] Figure 34 Macroscopic LPL images of the coating obtained in Example 37 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 3 seconds after turning off the white light);

[0057] Figure 35 This is the attenuation spectrum of the afterglow performance of the coating obtained in Example 38 of the present invention;

[0058] Figure 36 Macroscopic LPL images of the coating obtained in Example 39 of the present invention at room temperature (from left to right: during white light excitation and 1 second after the white light lamp is turned off);

[0059] Figure 37 Macroscopic LPL images of the organic long afterglow coating obtained in Example 2 of the present invention applied to a car cover for safety indication (from left to right: under ambient light, under white light excitation, and 1s, 3s, and 5s after turning off the white light);

[0060] Figure 38 Macroscopic LPL images of the film obtained in Example 46 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 6s after turning off the white light);

[0061] Figure 39 This is a graph showing the afterglow performance attenuation spectrum of the thin film obtained in Example 46 of the present invention;

[0062] Figure 40 Macroscopic LPL images of the film obtained in Example 47 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0063] Figure 41 Macroscopic LPL images of the film obtained in Example 48 of the present invention at room temperature (from left to right: during white light excitation, 1s, 3s, and 5s after turning off the white light);

[0064] Figure 42 Macroscopic LPL images of the film obtained in Example 49 of the present invention at room temperature (from left to right: during white light excitation, 1s, 2s, and 3s after turning off the white light);

[0065] Figure 43 This is a graph showing the attenuation spectrum of the afterglow performance of the thin film obtained in Example 50 of the present invention;

[0066] Figure 44 Macroscopic LPL images of the film obtained in Example 51 of the present invention at room temperature (from left to right: during white light excitation, 1 second, and 2 seconds after turning off the white light);

[0067] Figure 45 This is a graph showing the attenuation spectrum of the afterglow performance of the thin film obtained in Example 51 of the present invention;

[0068] Figure 46 This is a graph showing the attenuation spectrum of the afterglow performance of the thin film obtained in Example 52 of the present invention;

[0069] Figure 47 This is a graph showing the attenuation spectrum of the afterglow performance of the thin film obtained in Example 53 of the present invention;

[0070] Figure 48 This is a graph showing the attenuation spectrum of the afterglow performance of the thin film obtained in Example 54 of the present invention;

[0071] Figure 49 The present invention relates to the application of the afterglow excited by white light obtained from Examples 46 and 49 in large-area safety indication.

[0072] Figure 50 This is the application of the white light excited afterglow obtained in Example 46 of the present invention in metal flaw detection. DETAILED DESCRIPTION

[0073] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0074] Unless otherwise specified, the test materials and reagents used in the following examples can be obtained from commercial sources.

[0075] If no specific techniques or conditions are specified in the examples, they can be carried out according to the techniques or conditions described in the literature in the field or according to the product instructions.

[0076] In the following Examples 1 to 44 and Comparative Examples 1 to 14, the organic fluorescent dye luminophores were purchased from Tianjin Xiens Biochemical Technology Co., Ltd. (purity: 98%); the photocurable adhesive was purchased from Henkel Loctite (China) Co., Ltd. AA3491; Guangdong Youyang New Materials Co., Ltd., UV curing adhesive 3491 / YY1181; Foshan Jinggu Adhesive Co., Ltd., UV glue D-606; Dongguan Lelai Adhesive Products Co., Ltd., V-3218 / V-3018. Among them, AA 3491 and UV glue D-606 are acrylic adhesives. AA 3491 is a transparent, low viscosity, modified acrylate liquid adhesive that cures after a few seconds of 365nm UV exposure. UV-curing adhesives 3491 / YY1181 and V-3218 / V-3018 are polyurethane acrylate adhesives that cure after a few seconds of 365nm UV exposure.

[0077] The structural formula of the organic fluorescent dye used is shown below:

[0078]

[0079] The instruments and models involved in the tests in the following examples and comparative examples are:

[0080] Ocean Optics multi-band spectrometer;

[0081] Room temperature: 20-25°C;

[0082] The substrate can be glass, paper, polyurethane car cover film, etc. In the following embodiments and comparative examples, the substrate is glass or polyurethane car cover film.

[0083] In the following Examples 1-44 and Comparative Examples 1-14, the power of the UV lamp is 15W (365nm), and the power of the white light lamp is 20W.

[0084] Examples 1 to 44

[0085] A specific method for preparing a photocurable organic long-afterglow coating comprises the following steps: stirring an organic fluorescent dye luminophore in a solvent for 10 minutes to completely dissolve it to obtain a luminophore solution; mixing the luminophore solution with a photocurable adhesive; stirring the solution at room temperature for 2 minutes to obtain a solution; applying 0.5 mL of the solution dropwise on a glass substrate; standing the solution for 1 hour; and, after the solvent in the solution has completely evaporated, irradiating the solution with a 15W ultraviolet lamp for curing for 30 seconds to obtain a coating. The ratio of the photocurable adhesive to the organic fluorescent dye luminophore is 20,000:1 by mass, the ratio of the mass of the organic fluorescent dye luminophore to the volume of the solvent is 2:1, the units of mass are mg, the units of volume are ml, and the solvent is ethanol.

[0086] Table 1 shows the organic fluorescent dyes, photocurable adhesive types and their afterglow times in different embodiments.

[0087] Comparative Examples 1 to 14

[0088] A specific method for preparing a photocurable organic long-afterglow coating comprises: stirring an organic fluorescent dye luminophore in a solvent for 10 minutes to completely dissolve it, obtaining a luminophore solution; then mixing the luminophore solution with a photocurable adhesive; stirring at room temperature for 2 minutes to obtain a solution; applying 0.5 mL of the solution dropwise onto a glass substrate; allowing the solution to stand for 1 hour; and, after the solvent in the solution has completely evaporated, curing the solution with a 15W ultraviolet lamp for 30 seconds to obtain a coating. The ratio of the photocurable adhesive to the organic fluorescent dye luminophore is 20,000:1 by mass, and the ratio of the organic fluorescent dye luminophore to the solvent by volume is 2:1. The units of mass are mg and volume are ml. The solvent is ethanol. Table 1 shows the organic fluorescent dyes, photocurable adhesive types, and afterglow times for different comparative examples.

[0089] Table 1

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096]

[0097] Figure 1 This is a macroscopic LPL picture of the coating obtained in Example 1 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the coating emits light relatively uniformly.

[0098] Figure 2 This is a macroscopic LPL picture of the coating obtained in Example 2 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the coating emits light relatively uniformly.

[0099] Figure 3 This is a macroscopic LPL picture of the coating obtained in Example 3 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the coating emits light relatively uniformly.

[0100] in, Figure 1-3 In the image, there is still afterglow at 6s, and the brightness captured by the camera is much lower than that observed by the naked eye, resulting in very low brightness.

[0101] Figure 4 This is a macroscopic LPL picture of the coating obtained in Example 4 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the coating emits light relatively uniformly.

[0102] Figure 5 This is a macroscopic LPL picture of the coating obtained in Example 5 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0103] Figure 6 This is a macroscopic LPL picture of the coating obtained from Example 41 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 1 second. It can be seen that the coating emits light relatively uniformly, but the afterglow performance is weaker than that of the coating obtained from Examples 1-5.

[0104] Figure 7 This is a macroscopic LPL picture of the coating obtained in Example 6 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0105] Figure 8 This is a macroscopic LPL picture of the coating obtained in Example 7 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0106] Figure 9This is a macroscopic LPL picture of the coating obtained in Example 8 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0107] Figure 10 This is a macroscopic LPL picture of the coating obtained in Example 9 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the coating emits light relatively uniformly.

[0108] Figure 11 This is a macroscopic LPL picture of the coating obtained in Example 10 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0109] Figure 12 This is a macroscopic LPL picture of the coating obtained in Example 11 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the coating emits light relatively uniformly.

[0110] Figure 13 This is a macroscopic LPL picture of the coating obtained in Example 12 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the coating emits light relatively uniformly.

[0111] Figure 14 This is a macroscopic LPL picture of the coating obtained in Example 13 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the coating emits light relatively uniformly.

[0112] Figure 15 This is a macroscopic LPL picture of the coating obtained in Example 14 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the coating emits light relatively uniformly.

[0113] Figure 16 This is a macroscopic LPL picture of the coating obtained in Example 15 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0114] Figure 17 This is a macroscopic LPL picture of the coating obtained in Example 16 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0115] Figure 18 This is a macroscopic LPL picture of the coating obtained in Example 17 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0116] Figure 19 This is a macroscopic LPL picture of the coating obtained in Example 18 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the coating emits light relatively uniformly.

[0117] Figure 20 This is a macroscopic LPL picture of the coating obtained in Example 19 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the coating emits light relatively uniformly.

[0118] Figure 21 This is a macroscopic LPL picture of the coating obtained in Example 20 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 4 seconds. It can be seen that the coating emits light relatively uniformly.

[0119] Figure 22 This is a macroscopic LPL picture of the coating obtained from Example 42 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 1 second. It can be seen that the coating emits light relatively uniformly, but the afterglow performance is weaker than that of the coatings obtained from Examples 16-20.

[0120] Figure 23 This is a macroscopic LPL picture of the coating obtained in Example 21 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 2 seconds. It can be seen that the coating emits light relatively uniformly.

[0121] Figure 24 This is a macroscopic LPL picture of the coating obtained in Example 22 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 2 seconds. It can be seen that the coating emits light relatively uniformly.

[0122] Figure 25 This is a macroscopic LPL picture of the coating obtained in Example 23 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 2 seconds. It can be seen that the coating emits light relatively uniformly.

[0123] Figure 26 This is a macroscopic LPL picture of the coating obtained in Example 24 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 2 seconds. It can be seen that the coating emits light relatively uniformly.

[0124] Figure 27 This is a macroscopic LPL picture of the coating obtained in Example 25 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 2 seconds. It can be seen that the coating emits light relatively uniformly.

[0125] Figure 28This is a macroscopic LPL picture of the coating obtained from Example 43 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 1 second. It can be seen that the coating emits light relatively uniformly, but the afterglow performance is weaker than that of the coatings obtained from Examples 21-25.

[0126] Figure 29 This is a graph of the afterglow performance attenuation of the coating obtained in Example 26. As can be seen from the graph, from -2s to 0s is the time when the coating prepared in Example 26 is irradiated with a white light lamp, and the coating exhibits photoluminescence characteristics; from 0s to 1s is the long afterglow of the coating after the white light lamp is removed, and the afterglow time is about 1s.

[0127] Figure 30 This is a macroscopic LPL picture of the coating obtained in Example 27 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 1 second. It can be seen that the coating emits light relatively uniformly.

[0128] Figure 31 This is a graph of the afterglow performance attenuation of the coating obtained in Example 31. As can be seen from the graph, -2s to 0s is the time when the coating prepared in Example 31 is irradiated with a white light lamp, and the coating exhibits photoluminescence characteristics; 0s to 2s is the long afterglow of the coating after the white light lamp is removed, and the afterglow time is about 2s.

[0129] Figure 32 This is a graph of the afterglow performance attenuation of the coating obtained in Example 32. As can be seen from the graph, from -2s to 0s is the coating prepared in Example 32 irradiated with a white light lamp, and the coating exhibits photoluminescence characteristics; from 0s to 2s is the long afterglow of the coating after the white light lamp is removed, and the afterglow time is about 2s.

[0130] Figure 33 This is a macroscopic LPL picture of the coating obtained in Example 36 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the coating emits light relatively uniformly.

[0131] Figure 34 This is a macroscopic LPL picture of the coating obtained in Example 37 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the coating emits light relatively uniformly.

[0132] Figure 35 This is a graph of the afterglow performance attenuation of the coating obtained in Example 38. As can be seen from the graph, from -2s to 0s is the coating prepared in Example 38 irradiated with a white light lamp, and the coating exhibits photoluminescence characteristics; from 0s to 3s is the long afterglow of the coating after the white light lamp is removed, and the afterglow time is about 3s.

[0133] Figure 36This is a macroscopic LPL picture of the coating obtained in Example 39 at room temperature. It is excited by a white light lamp, and the light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 1 second. It can be seen that the coating emits light relatively uniformly.

[0134] Example 45

[0135] Preparation of a photocurable organic long afterglow coating and its application in car cover safety indication. The specific method includes the following steps:

[0136] Step 1: Stirring an organic fluorescent dye luminophore in a solvent for 10 minutes to completely dissolve it to obtain a luminophore solution, then mixing the luminophore solution with a photocurable adhesive and stirring at room temperature for 2 minutes to obtain a solution, wherein the photocurable adhesive, the organic fluorescent dye luminophore material, and the solvent are the same as those in Example 2. In terms of mass, the ratio of the photocurable adhesive to the organic fluorescent dye luminophore is 20,000:1, the ratio of the mass of the organic fluorescent dye luminophore to the volume of the solvent is 2:1, the units of mass are mg, and the units of volume are ml. The solvent is ethanol.

[0137] Step 2: Apply the solution to the car cover film by knife coating and let it stand at room temperature for 0.5 hours. After the ethanol evaporates completely, cure it with a 365nm UV lamp for 30 seconds. After curing, illuminate the car cover surface with a white light lamp for 3 seconds. After turning off the excitation light source, an afterglow is observed on the car cover surface. In this example, the car cover is made of polyurethane (TPU) material.

[0138] like Figure 37 As shown in the figure, after turning off the white light, you can see the car cover film emitting a long yellow-green afterglow, and safety indication can be achieved through the afterglow phenomenon.

[0139] In the above-mentioned Examples 1-45, by AA3491 replaced AA3492 can achieve the same technical effect; by replacing UV curing adhesive 3491 (Guangdong Youyang New Materials Co., Ltd.) with UV curing adhesive 3492 (Guangdong Youyang New Materials Co., Ltd.), the same technical effect can be achieved.

[0140] In the following Examples 46-54 and Comparative Examples 15-16, the power of the UV lamp is 15W (365nm), and the power of the white light lamp is 30W.

[0141] Examples 46-54

[0142] Mix the photocurable adhesive, organic fluorescent dye and solvent, stir for 5 minutes at room temperature of 20-25°C to obtain a solution, take 0.5 mL of the solution and apply it dropwise on the substrate, let it stand for 2 hours at room temperature to allow the solvent in the solution to evaporate completely, and cure it with a 15W ultraviolet lamp for 30 seconds to obtain a film, wherein the ratio of the organic fluorescent dye to the photocurable adhesive is 1:300 by mass, the ratio of the mass of the photocurable adhesive to the volume of the solvent is 3:10, the unit of mass is g, the unit of volume is mL, and the solvent is ethanol. The organic fluorescent dyes of different embodiments and their afterglow time are shown in Table 2. The photocurable adhesive was purchased from Henkel Loctite (China) Co., Ltd. ( AA3491).

[0143] Comparative Examples 15-16

[0144] The only difference from Example 46 is that the organic fluorescent dye used is different from that in Example 46, and the rest is the same as Example 46. The organic fluorescent dyes of different comparative examples and their afterglow times are shown in Table 2.

[0145] Table 2

[0146]

[0147]

[0148]

[0149] In the present invention, an LPL film with relatively uniform luminescence can be obtained by mixing an organic fluorescent dye and a light-curing adhesive and performing a light-curing process.

[0150] Figure 38 This is a macroscopic LPL picture of the film obtained from Example 46 at room temperature. The film is excited with a white light lamp, and the white light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 6 seconds. It can be seen that the film emits light relatively uniformly.

[0151] Figure 39 This is a graph of the afterglow performance attenuation of the film obtained in Example 46. As can be seen from the graph, -2s to 0s is the time when the film prepared in Example 46 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 6s is the long afterglow of the film after the white light lamp is removed, and the afterglow time is about 6s, which is similar to the afterglow time observed by the naked eye.

[0152] Figure 40 This is a macroscopic LPL picture of the film obtained from Example 47 at room temperature. The film is excited with a white light lamp, and the white light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the film emits light relatively uniformly.

[0153] Figure 41This is a macroscopic LPL picture of the film obtained from Example 48 at room temperature. The film is excited with a white light lamp, and the white light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 5 seconds. It can be seen that the film emits light relatively uniformly.

[0154] Figure 42 This is a macroscopic LPL picture of the film obtained from Example 49 at room temperature. The film is excited with a white light lamp, and the white light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 3 seconds. It can be seen that the film emits light relatively uniformly.

[0155] Figure 43 This is a graph of the afterglow performance attenuation of the film obtained in Example 50. As can be seen from the graph, -2s to 0s is the time when the film prepared in Example 50 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 5s is the long afterglow of the film after the white light lamp is removed, and the afterglow time is about 5s.

[0156] Figure 44 This is a macroscopic LPL picture of the film obtained in Example 51 at room temperature. The film is excited by a white light lamp. After irradiation for 3 seconds, the white light source is turned off. The afterglow can be maintained for 2 seconds. It can be seen that the film emits light relatively uniformly.

[0157] Figure 45 This is a graph of the afterglow performance attenuation of the film obtained in Example 51. As can be seen from the graph, -2s to 0s is the time when the film prepared in Example 51 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 2s is the long afterglow of the film after the white light lamp is removed, and the afterglow time is about 2s, which is similar to the afterglow time observed by the naked eye.

[0158] Figure 46 This is a graph of the afterglow performance attenuation of the film obtained in Example 52. As can be seen from the graph, -2s to 0s is the time when the film prepared in Example 52 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 1s is the long afterglow of the film after the white light lamp is removed, and the afterglow time is about 1s.

[0159] Figure 47 This is a graph of the afterglow performance attenuation of the film obtained in Example 53. As can be seen from the graph, from -2s to 0s is the time when the film prepared in Example 53 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; from 0s to 1s is the long afterglow of the film after the white light lamp is removed, and the afterglow time is about 1s.

[0160] Figure 48 This is a graph of the afterglow performance attenuation of the film obtained in Example 54. As can be seen from the graph, -2s to 0s is the time when the film prepared in Example 54 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 1s is the long afterglow of the film after the white light lamp is removed, and the afterglow time is about 1s.

[0161] Depend on Figure 1-48It can be seen that the present invention can induce afterglow emission of the fluorescent dye under white light excitation by mixing the organic fluorescent dye and the photocurable adhesive and performing a photocuring process.

[0162] Example 55

[0163] The afterglow emission of organic fluorescent dyes induced by light-curing adhesives under white light excitation is applied to large-area safety indication. The specific method includes the following steps:

[0164] Step 1: Mix a photocurable adhesive, an organic fluorescent dye, and a solvent, and stir at room temperature (20-25°C) for 5 minutes to obtain a solution. The photocurable adhesive, organic fluorescent dye, and solvent are the same as those in Example 46. The ratio of the fluorescent dye to the photocurable adhesive is 1:300 by mass, and the ratio of the mass of the photocurable adhesive to the volume of the solvent is 3:10. The units of mass are g and volume are mL. The solvent is ethanol.

[0165] Step 2: Mix a photocurable adhesive, an organic fluorescent dye, and a solvent, and stir at room temperature (20-25°C) for 5 minutes to obtain a solution. The photocurable adhesive, organic fluorescent dye, and solvent are the same as those in Example 49. The ratio of the fluorescent dye to the photocurable adhesive is 1:300 by mass, and the ratio of the mass of the photocurable adhesive to the volume of the solvent is 3:10. The units of mass are g and volume are mL. The solvent is ethanol.

[0166] Step 3: Apply the solution to a large area of ​​the "No Left Turn" safety sign. The "left turn arrow" is coated with the solution obtained in Example 46, and the "No" is coated with the solution obtained in Example 49. After the solvent evaporates, irradiate with a 365nm ultraviolet lamp for curing ( Figure 49 a).

[0167] Step 4: When providing safety instructions, use a white light to illuminate the safety sign. After turning off the white light, an afterglow can be observed on the sign, thereby serving as a safety instruction.

[0168] like Figure 49 As shown in the figure, when the white light is on, the "No Left Turn" sign can be seen. When the white light source is removed, the "Left Turn Arrow" shows a yellow-green afterglow, and the "No" sign shows an orange afterglow ( Figure 49 b) so that the road signs have both reflective and afterglow characteristics, which can better play the role of safety instructions (such as Figure 49 , using a 1 yuan coin as a reference, you can compare the size of the sign).

[0169] Example 56

[0170] The application of afterglow emission of organic fluorescent dyes induced by light-curing adhesives under white light excitation in metal flaw detection. The specific method includes the following steps:

[0171] Step 1: Mix a photocurable adhesive, an organic fluorescent dye, and a solvent, and stir at room temperature (20-25°C) for 5 minutes to obtain a solution. The photocurable adhesive, organic fluorescent dye, and solvent are the same as those in Example 46. The ratio of the fluorescent dye to the photocurable adhesive is 1:300 by mass, and the ratio of the mass of the photocurable adhesive to the volume of the solvent is 3:10. The units of mass are g and volume are mL. The solvent is ethanol.

[0172] Step 2: Apply the solution obtained in step 1 to the metal surface, use ethanol as a cleaning agent to wipe off excess solution on the metal surface, and after the ethanol evaporates, use a 365nm ultraviolet lamp to solidify it, and use the long afterglow material in the solution as a penetrant and developer for penetrant testing: use a white light lamp to illuminate the metal surface, and judge the position and size of the defect by the afterglow. When there is an open defect on the metal surface, the open defect emits a long afterglow, and when there is no open defect on the metal surface, no long afterglow is emitted.

[0173] like Figure 50 As shown in the figure, after turning off the white light, you can see that the open defect emits a long yellow-green afterglow. The afterglow phenomenon can be used to determine the position and size of the defect, thereby realizing non-destructive testing of metal flaw detection.

[0174] In the above Examples 46-54, by AA3491 replaced AA3492 can achieve consistent technical results.

[0175] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. Application of a light-curing material in safety indication or metal flaw detection, characterized in that: The photocurable material is formed by uniformly mixing an organic fluorescent dye, a solvent, and a photocurable adhesive, wherein the mass ratio of the photocurable adhesive to the organic fluorescent dye is (300-40000):1, the organic fluorescent dye is a mixture of one or more of quinacridone, acridinium yellow, acridinium yellow G, acridinium yellow hydrochloride, proflavine sulfate, acridinium orange, acridinone, ethidium bromide, and 9-aminoacridine, and the photocurable adhesive is a mixture of one or more of UV glue D-606, ultraviolet curing adhesive 3491, ultraviolet curing adhesive YY1181, V3218, and ultraviolet curing adhesive 3492; or, the organic fluorescent dye is a mixture of one or more of acridinium yellow, proflavine sulfate, acridinium orange, and 9-aminoacridine, and the photocurable adhesive is V3018; When the photocurable material is used for metal flaw detection, the photocurable material is applied to the metal surface, the excess solution on the metal surface is wiped off, and the material is cured with ultraviolet light. The metal surface is illuminated with a white light lamp, and the position and size of the defect are judged by the afterglow. When there is an open defect on the metal surface, the open defect emits a long afterglow, and when there is no open defect on the metal surface, no long afterglow is emitted. When the light-curing material is used for safety indication, the light-curing material is applied to the surface of the substrate, cured with ultraviolet light, and excited with white light. After the excitation light source is turned off, afterglow is observed on the surface of the substrate; The UV curing adhesive 3491 is from Henkel Loctite China Co., Ltd. One or a mixture of two of the UV curing adhesive 3491 of Guangdong Youyang New Materials Co., Ltd.; the UV curing adhesive 3492 is Henkel Loctite China Co., Ltd. One or a mixture of two of the UV curing adhesive 3492 from Guangdong Youyang New Materials Co., Ltd.; The UV glue D-606 comes from Foshan Jinggu Adhesive Co., Ltd., the UV curing adhesive YY1181 comes from Guangdong Youyang New Materials Co., Ltd., and the V3218 comes from Dongguan Lelai Adhesive Products Co., Ltd. V3018 comes from Dongguan Lelai Adhesive Products Co., Ltd.

2. The use according to claim 1, characterized in that: The usage ratio of the organic fluorescent dye and the solvent is 1-5 mg: 1-15 ml.

3. The use according to claim 1, characterized in that: Use an ultraviolet lamp with a wavelength of 365nm and a power of 15W to cure for 20 to 40 seconds.

4. The use according to claim 1, characterized in that: Use ultraviolet lamp with a wavelength of 365nm and a power of 15W for curing for 20 to 40 seconds, and use white light lamp for 3 seconds.

5. The use according to claim 1, characterized in that: After wiping off the excess solution from the metal surface, the solvent is evaporated and then cured with ultraviolet light.

6. The use according to claim 1, characterized in that: The substrate is a car cover or a safety sign.

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