Application of photocuring material in safety indication or metal flaw detection and safety indication and metal flaw detection method

Abstract

The invention discloses application of a photocuring material in safety indication or metal flaw detection and a safety indication and metal flaw detection method. The photocuring material is formed by uniformly mixing raw materials including organic fluorescent dye and photocuring glue, the organic fluorescent dye is one or a mixture of more of quinacridone, acridine yellow, acridine yellow G, acridine hydrochloride, protoflavin sulfate, acridine orange, acridone, ethidium bromide and 9-amino acridine, and the photocuring adhesive is one or a mixture of more of UV (ultraviolet) dripping glue D-606, an ultraviolet curing adhesive 3491, an ultraviolet curing adhesive YY1181, V3218 and an ultraviolet curing adhesive 3492. Or the organic fluorescent dye is one or a mixture of more of acridine yellow, protoflavin sulfate, acridine orange and 9-amino acridine, and the photocuring adhesive is V3018. After being cured, the photocuring material disclosed by the invention can perform afterglow emission under the excitation of white light, and can be applied to large-area safety indication and metal flaw detection.

Description

Technical Field

[0001] The invention relates to the technical field of organic long afterglow materials, and in particular to an application of a photocurable 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, etc., which have attracted widespread attention from scientific researchers. At present, many organic small molecules with long afterglow luminescence properties have been prepared and widely used in three-dimensional display, anti-counterfeiting and information encryption, and biological imaging.

[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, have charge transfer state characteristics that can help absorb light in the visible light region, 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] The use of polymer curing, such as light curing and heat curing, has been proven to be effective in inducing long afterglow. For example, the Chinese patent application document with publication number CN116768489A discloses a method for preparing a pure organic fluorescent long afterglow film excited by visible light, including: using a polyhydroxy polymer matrix material and a solvent to configure a main solution; using fluorescent dye molecules and a solvent to configure a guest solution; using a mixed solution of the main solution and the guest solution to configure a target solution; dripping the target solution onto a glass sheet to remove the solvent in the target solution to obtain a pure organic fluorescent long afterglow film excited by visible light; wherein hydrogen bonds are formed between the polyhydroxy polymer matrix material and the fluorescent dye molecules. The obtained film can be used in the field of color-adjustable lighting sources, the field of industrial product manufacturing, and the field of anti-counterfeiting labels, but its process is complicated and its film-forming method is not conducive to applications in metal flaw detection and other aspects. 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] An application of a photocurable material in safety indication or metal flaw detection, wherein the photocurable material is formed by uniformly mixing raw materials including an organic fluorescent dye and a photocurable adhesive;

[0008] Wherein, 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; 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 acridine yellow, proflavine sulfate, acridine orange, and 9-aminoacridine, and the photocurable 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 Henkel Loctite (China) Co., Ltd. AA3492, UV curing adhesive 3492 of Guangdong Youyang New Materials Co., Ltd., or a mixture of two of them.

[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 photocurable 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 method for metal flaw detection, 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 with ultraviolet light.

[0018] The present invention also proposes a method for safety indication using the photocurable material, 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 after turning off the excitation light source, observing afterglow on the surface of the substrate.

[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 photocurable 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 the photocuring, the photocurable material of the present invention can obtain a smooth coating with good afterglow performance and stable afterglow performance. No heating process is required to obtain the coating, and the conditions are mild and not harsh, which will be very beneficial to 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 The macroscopic LPL images of the coating obtained in Example 1 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 6s after turning off the white light);

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

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

[0026] Figure 4 The macroscopic LPL images of the coating obtained in Example 4 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light, and 3s after turning off the white light);

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

[0028] Figure 6 This is a macroscopic LPL image of the coating obtained in Example 41 of the present invention at room temperature (from left to right: when excited by white light and 1 second after turning off the white light lamp);

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

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

[0031] Fig. 9 The macroscopic LPL images of the coating obtained in Example 8 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0032] Fig.10 The macroscopic LPL images of the coating obtained in Example 9 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light, and 3s after turning off the white light);

[0033] Fig.11 The macroscopic LPL images of the coating obtained in Example 10 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0034] Fig.12 The macroscopic LPL images of the coating obtained in Example 11 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 6s after turning off the white light);

[0035] Fig.13 The macroscopic LPL images of the coating obtained in Example 12 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 6s after turning off the white light);

[0036] Fig.14 The macroscopic LPL images of the coating obtained in Example 13 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 6s after turning off the white light);

[0037] Fig.15 This is a macroscopic LPL image of the coating obtained in Example 14 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light lamp, and 3s after turning off the white light lamp);

[0038] Fig.16This is a macroscopic LPL image of the coating obtained in Example 15 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0039] Fig.17 This is a macroscopic LPL image of the coating obtained in Example 16 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0040] Fig.18 This is a macroscopic LPL image of the coating obtained in Example 17 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0041] Fig.19 This is a macroscopic LPL image of the coating obtained in Example 18 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0042] Fig. 20 This is a macroscopic LPL image of the coating obtained in Example 19 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light lamp, and 3s after turning off the white light lamp);

[0043] Fig.21 This is a macroscopic LPL image of the coating obtained in Example 20 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light lamp, and 4s after turning off the white light lamp);

[0044] Fig. 22 This is a macroscopic LPL image of the coating obtained in Example 42 of the present invention at room temperature (from left to right: when excited by white light and 1 second after turning off the white light lamp);

[0045] Fig.23 This is a macroscopic LPL image of the coating obtained in Example 21 of the present invention at room temperature (from left to right: when excited by white light, 1s and 2s after turning off the white light);

[0046] Fig.24 This is a macroscopic LPL image of the coating obtained in Example 22 of the present invention at room temperature (from left to right: when excited by white light, 1s and 2s after turning off the white light);

[0047] Fig.25 This is a macroscopic LPL image of the coating obtained in Example 23 of the present invention at room temperature (from left to right: when excited by white light, 1s and 2s after turning off the white light);

[0048] Fig.26 This is a macroscopic LPL image of the coating obtained in Example 24 of the present invention at room temperature (from left to right: when excited by white light, 1s and 2s after turning off the white light lamp);

[0049] Fig. 27 This is a macroscopic LPL image of the coating obtained in Example 25 of the present invention at room temperature (from left to right: when excited by white light, 1s and 2s after turning off the white light lamp);

[0050] Fig.28 This is a macroscopic LPL image of the coating obtained in Example 43 of the present invention at room temperature (from left to right: when excited by white light and 1 second after turning off the white light);

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

[0052] Fig.30 This is a macroscopic LPL image of the coating obtained in Example 27 of the present invention at room temperature (from left to right: when excited by white light and 1 second after turning off the white light);

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

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

[0055] Fig.33 This is a macroscopic LPL image of the coating obtained in Example 36 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light lamp, and 3s after turning off the white light lamp);

[0056] Fig.34 This is a macroscopic LPL image of the coating obtained in Example 37 of the present invention at room temperature (from left to right: when excited by white light, 1s after turning off the white light lamp, and 3s after turning off the white light lamp);

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

[0058] Fig.36 This is a macroscopic LPL image of the coating obtained in Example 39 of the present invention at room temperature (from left to right: when excited by white light and 1 second after turning off the white light);

[0059] Fig.37 This is a macroscopic LPL picture of the organic long afterglow coating obtained in Example 2 of the present invention applied on a car cover for safety indication application (from left to right: under ambient light, when excited by white light, and 1s, 3s, and 5s after turning off the white light);

[0060] Fig.38 The macroscopic LPL images of the film obtained in Example 46 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 6s after turning off the white light);

[0061] Fig.39 This is the attenuation spectrum of the afterglow performance of the thin film obtained in Example 46 of the present invention;

[0062] Fig.40 The macroscopic LPL images of the film obtained in Example 47 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0063] Fig.41 The macroscopic LPL images of the film obtained in Example 48 of the present invention at room temperature (from left to right: when excited by white light, 1s, 3s, and 5s after turning off the white light);

[0064] Fig.42 The macroscopic LPL images of the film obtained in Example 49 of the present invention at room temperature (from left to right: when excited by white light, 1s, 2s, and 3s after turning off the white light);

[0065] Fig.43 This is the attenuation spectrum of the afterglow performance of the thin film obtained in Example 50 of the present invention;

[0066] Fig.44 This is a macroscopic LPL image of the film obtained in Example 51 of the present invention at room temperature (from left to right: when excited by white light, 1s and 2s after turning off the white light);

[0067] Fig.45 This is the attenuation spectrum of the afterglow performance of the thin film obtained in Example 51 of the present invention;

[0068] Fig.46 This is the attenuation spectrum of the afterglow performance of the thin film obtained in Example 52 of the present invention;

[0069] Fig.47 This is the attenuation spectrum of the afterglow performance of the thin film obtained in Example 53 of the present invention;

[0070] Fig.48 This is the attenuation spectrum of the afterglow performance of the thin film obtained in Example 54 of the present invention;

[0071] Fig.49 The present invention is an application of the afterglow excited by white light obtained by Example 46 and Example 49 in large-area safety indication;

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

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are 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 art 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 photocuring 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 acrylic ester liquid adhesive that cures after a few seconds of 365nm ultraviolet irradiation. UV curing adhesives 3491 / YY1181, V-3218 / V-3018 are polyurethane acrylate adhesives that can be cured after a few seconds of 365nm ultraviolet irradiation.

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

[0078]

[0079] The following examples and comparative examples are used in the following tests:

[0080] Ocean Optics multi-band spectrometer;

[0081] Room temperature: 20-25℃;

[0082] The substrate may 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] Embodiments 1 to 44

[0085] A specific method for preparing a photocurable organic long afterglow coating is as follows: 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, stirring for 2 minutes at room temperature to obtain a solution, taking 0.5 mL of the solution and drop-coating it on a glass substrate, standing for 1 hour, and after the solvent in the solution is completely evaporated, irradiating and curing it with a 15W ultraviolet lamp for 30 seconds to obtain a coating, wherein, in terms of mass fraction, the ratio of the photocurable adhesive to the organic fluorescent dye luminophore is 20000:1, the ratio of the mass fraction of the organic fluorescent dye luminophore to the volume fraction of the solvent is 2:1, the unit of the mass fraction is mg, the unit of the volume fraction is ml, and the solvent is ethanol.

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

[0087] Comparative Examples 1 to 14

[0088] A specific method for preparing a photocurable organic long afterglow coating is as follows: 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, stirring for 2 minutes at room temperature to obtain a solution, taking 0.5 mL of the solution and applying it dropwise on a glass substrate, standing for 1 hour, and after the solvent in the above solution is completely evaporated, irradiating and curing it with a 15W ultraviolet lamp for 30 seconds to obtain a coating, wherein, by mass, the ratio of the photocurable adhesive to the organic fluorescent dye luminophore is 20000:1, the ratio of the mass fraction of the organic fluorescent dye luminophore to the volume fraction of the solvent is 2:1, the unit of mass fraction is mg, the unit of volume fraction is ml, and the solvent is ethanol. The organic fluorescent dyes, photocurable adhesive types and their afterglow times of different comparative examples are shown in Table 1.

[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 more evenly.

[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 more evenly.

[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 more evenly.

[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 more evenly.

[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 more evenly.

[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 more 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 more evenly.

[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 evenly.

[0106] Fig. 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 more evenly.

[0107] Fig.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 more evenly.

[0108] Fig.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 more evenly.

[0109] Fig.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 evenly.

[0110] Fig.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 evenly.

[0111] Fig.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 evenly.

[0112] Fig.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 evenly.

[0113] Fig.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 evenly.

[0114] Fig.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 evenly.

[0115] Fig.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 evenly.

[0116] Fig.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 evenly.

[0117] Fig. 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 evenly.

[0118] Fig.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 evenly.

[0119] Fig. 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 more uniformly, but the afterglow performance is weaker than that of the coating obtained from Examples 16-20.

[0120] Fig.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 evenly.

[0121] Fig.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 evenly.

[0122] Fig.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 evenly.

[0123] Fig.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 evenly.

[0124] Fig. 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 evenly.

[0125] Fig.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 more uniformly, but the afterglow performance is weaker than that of the coating obtained from Examples 21-25.

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

[0127] Fig.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 evenly.

[0128] Fig.31 This is the afterglow performance attenuation diagram of the coating obtained in Example 31. It can be seen from the figure that from -2s to 0s is the coating prepared in Example 31 irradiated with white light, and the coating exhibits photoluminescence characteristics; from 0s to 2s is the long afterglow luminescence of the coating after the white light is removed, and the afterglow time is about 2s.

[0129] Fig.32 This is the afterglow performance attenuation diagram of the coating obtained in Example 32. It can be seen from the figure that from -2s to 0s is the coating prepared in Example 32 irradiated with white light, and the coating exhibits photoluminescence characteristics; from 0s to 2s is the long afterglow luminescence of the coating after the white light is removed, and the afterglow time is about 2s.

[0130] Fig.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 evenly.

[0131] Fig.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 evenly.

[0132] Fig.35 This is the afterglow performance attenuation diagram of the coating obtained in Example 38. It can be seen from the figure that 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 luminescence of the coating after the white light lamp is removed, and the afterglow time is about 3s.

[0133] Fig.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 evenly.

[0134] Embodiment 45

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

[0136] Step 1, stirring the organic fluorescent dye luminophore in a solvent for 10 minutes to completely dissolve it, obtaining a luminophore solution, and then mixing the luminophore solution with a photocurable adhesive, stirring for 2 minutes at room temperature 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 fractions, the ratio of the photocurable adhesive to the organic fluorescent dye luminophore is 20000:1, the ratio of the mass fraction of the organic fluorescent dye luminophore to the volume fraction of the solvent is 2:1, the unit of mass fraction is mg, the unit of volume fraction is ml, and the solvent is ethanol.

[0137] Step 2, apply the solution on the car cover film, let it stand at room temperature for 0.5 hours, and after the ethanol evaporates completely, cure it with a 365nm ultraviolet lamp for 30 seconds, and after curing, irradiate the car cover surface with a white light lamp for 3 seconds, and after turning off the excitation light source, observe afterglow on the car cover surface. In this embodiment, the car cover is made of polyurethane (TPU) material.

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

[0139] In the above-mentioned embodiments 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 drop it 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 fraction of the photocurable adhesive to the volume fraction of the solvent is 3:10, the unit of mass fraction is g, the unit of volume fraction 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 photocurable adhesive and performing a photocuring process.

[0150] Fig.38 This is a macroscopic LPL picture of the film obtained in Example 46 at room temperature. The film is excited by a white light lamp. 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 evenly.

[0151] Fig.39 This is the afterglow performance attenuation diagram of the film obtained by Example 46. It can be seen from the figure that -2s to 0s is the time when the film prepared by Example 46 is irradiated with a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 6s is the long afterglow luminescence 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] Fig.40 This is a macroscopic LPL picture of the film obtained in Example 47 at room temperature. The film is excited by a white light lamp. 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 evenly.

[0153] Fig.41This is a macroscopic LPL picture of the film obtained from Example 48 at room temperature. The film is excited by a white light lamp. 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 evenly.

[0154] Fig.42 This is a macroscopic LPL picture of the film obtained in Example 49 at room temperature. The film is excited by a white light lamp. 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 evenly.

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

[0156] Fig.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. The white light source is turned off after irradiation for 3 seconds. The afterglow can be maintained for 2 seconds. It can be seen that the film emits light relatively evenly.

[0157] Fig.45 This is the afterglow performance attenuation diagram of the film obtained in Example 51. It can be seen from the figure that -2s to 0s is the time when the film prepared in Example 51 is irradiated by a white light lamp, and the film exhibits photoluminescence characteristics; 0s to 2s is the long afterglow luminescence 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] Fig.46 This is the afterglow performance attenuation diagram of the film obtained in Example 52. It can be seen from the figure that from -2s to 0s is the white light lamp irradiating the film prepared in Example 52, and the film exhibits photoluminescence characteristics; 0s to 1s is the long afterglow luminescence of the film after the white light lamp is removed, and the afterglow time is about 1s.

[0159] Fig.47 This is the afterglow performance attenuation diagram of the film obtained by Example 53. It can be seen from the figure that from -2s to 0s is the white light lamp irradiating the film prepared by Example 53, and the film exhibits photoluminescence characteristics; 0s to 1s is the long afterglow luminescence of the film after the white light lamp is removed, and the afterglow time is about 1s.

[0160] Fig.48 This is the afterglow performance attenuation diagram of the film obtained by Example 54. It can be seen from the figure that from -2s to 0s is the white light lamp irradiating the film prepared by Example 54, and the film exhibits photoluminescence characteristics; 0s to 1s is the long afterglow luminescence 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] Embodiment 55

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

[0164] Step 1, mixing a photocurable adhesive, an organic fluorescent dye and a solvent, stirring for 5 minutes at room temperature of 20 to 25° C. to obtain a solution, wherein the photocurable adhesive, the organic fluorescent dye and the solvent are the same as those in Example 46. In terms of mass fractions, the ratio of the fluorescent dye to the photocurable adhesive is 1:300, the ratio of the mass fraction of the photocurable adhesive to the volume fraction of the solvent is 3:10, the unit of mass fraction is g, the unit of volume fraction is mL, and the solvent is ethanol.

[0165] Step 2, mixing a photocurable adhesive, an organic fluorescent dye and a solvent, stirring for 5 minutes at room temperature of 20 to 25° C. to obtain a solution, wherein the photocurable adhesive, the organic fluorescent dye and the solvent are the same as those in Example 49. In terms of mass fractions, the ratio of the fluorescent dye to the photocurable adhesive is 1:300, the ratio of the mass fraction of the photocurable adhesive to the volume fraction of the solvent is 3:10, the unit of mass fraction is g, the unit of volume fraction is mL, and the solvent is ethanol.

[0166] Step 3, apply the solution to a large area of ​​the "No Left Turn" safety sign, wherein 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 ( Fig.49 a).

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

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

[0169] Embodiment 56

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

[0171] Step 1, mixing a photocurable adhesive, an organic fluorescent dye and a solvent, stirring for 5 minutes at room temperature of 20 to 25° C. to obtain a solution, wherein the photocurable adhesive, the organic fluorescent dye and the solvent are the same as those in Example 46. In terms of mass fractions, the ratio of the fluorescent dye to the photocurable adhesive is 1:300, the ratio of the mass fraction of the photocurable adhesive to the volume fraction of the solvent is 3:10, the unit of mass fraction is g, the unit of volume fraction is mL, and the solvent is ethanol.

[0172] Step 2, apply the solution obtained in step 1 on the metal surface, use ethanol as a cleaning agent to wipe off the excess solution on the metal surface, after the ethanol evaporates, use a 365nm ultraviolet lamp to solidify, and use the long afterglow material in the solution as a penetrant and developer for penetrant flaw detection: 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 Fig.50 As shown in the figure, after turning off the white light, you can see that the opening defect emits a long yellow-green afterglow. The location and size of the defect can be determined through the afterglow phenomenon, thereby realizing non-destructive testing of metal flaw detection.

[0174] In the above-mentioned 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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 embodiments of the present invention.

Claims

1. Application of a photocurable material in safety indication or metal flaw detection, wherein the photocurable material is formed by uniformly mixing raw materials including an organic fluorescent dye and a photocurable adhesive; in, 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; 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; Alternatively, the organic fluorescent dye is a mixture of one or more of acridine yellow, proflavine sulfate, acridine orange, and 9-aminoacridine, and the photocurable adhesive is V3018.

2. The use of the light-curing material according to claim 1 in safety indication or metal flaw detection, characterized in that: 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 Henkel Loctite (China) Co., Ltd. AA3492, UV curing adhesive 3492 of Guangdong Youyang New Materials Co., Ltd., or a mixture of two of them.

3. The use of the light-curing material according to claim 1 in safety indication or metal flaw detection, characterized in that: 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.

4. The use of the light-curing material according to claim 1 in safety indication or metal flaw detection, characterized in that: The mass ratio of the photocurable adhesive to the organic fluorescent dye is 300-40000:

1.

5. The use of the light-curing material according to claim 1 in safety indication or metal flaw detection, characterized in that: The raw material also includes a solvent, and the usage ratio of the organic fluorescent dye to the solvent is 1-5 mg: 1-15 ml.

6. A method for metal flaw detection, characterized in that: The following steps are involved: Apply the photocurable material as described in any one of claims 1 to 5 on a metal surface, wipe off excess solution on the metal surface, cure with ultraviolet light, irradiate the metal surface with a white light lamp, 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.

7. The metal flaw detection method according to claim 6, 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.

8. The metal flaw detection method according to claim 6, characterized in that: After wiping off the excess solution on the metal surface, the solvent is evaporated and then cured with ultraviolet light.

9. A method for performing safety indication using the light-curable material according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: applying a light-curing 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.

10. The method for performing safety indication using the light-curable material according to claim 9, characterized in that: The substrate is a car cover or a safety sign.

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