A fluorescent anti-loose marking material and a preparation method thereof

Abstract

The application provides a novel fluorescent marking material composition and a fluorescent paint prepared from the same. The novel fluorescent marking material composition comprises, by weight parts, 4-14 parts of fluorescent powder, 18-35 parts of ethylene glycol, 30-50 parts of water-based polyurethane dispersion, 10-21 parts of acrylic resin, 5-15 parts of pure acrylic emulsion, 8-15 parts of polyethylene glycol, and 65-160 parts of water. The raw material composition of the fluorescent powder comprises Sr(NO3)2, Al(NO3)3, urea, Ce(NO3)3, Tb(NO3)3 and Eu(NO3)3 in a molar ratio of (100-150):(200-300):(900-1000):(1-10):(1-90):(1-10). The fluorescent paint has high luminous intensity, is wear-resistant, flexible, weather-resistant, has strong adhesion and impact resistance, and is particularly suitable for application in loose mark prevention.

Description

Technical Field

[0001] This invention belongs to the field of coatings, specifically relating to a novel fluorescent anti-loosening marking material, its preparation method, and its application. Background Technology

[0002] Fluorescent coatings combine the properties of coatings and fluorescence, and have been widely used in traffic signs, road markings, safety signs, automotive parts, and decorations. Currently, new fluorescent coatings are required not only to have high luminous intensity, but also to have more emission wavelengths and superior overall performance.

[0003] The use of bolts and other fasteners in locations such as bogies and undercarriage equipment compartments on high-speed trains is extensive. During train operation, these bolts can loosen under long-term vibration and aerodynamic loads, easily leading to bolts falling off and causing the entire component to detach from the car body. The detached component may impact the train body, causing damage; furthermore, the detached equipment may fall onto the rails, causing unpredictable safety accidents. To prevent component detachment due to loose bolts, train bolts and other fasteners are generally marked with anti-loosening marks to accurately identify loose bolts. Anti-loosening marks are commonly used on bolts, nuts, fasteners, and equipment components. These marks allow for visual inspection of whether nuts, bolts, fasteners, and assembled components are loose. If a component is loose, the mark will show obvious breakage and deformation, indicating that maintenance personnel should focus on inspecting and repairing that bolt. Since the operation of high-speed trains, numerous component detachment failures have occurred throughout the railway network. Currently, field personnel urgently need highly identifiable and durable anti-loosening marks, especially an anti-loosening mark system easily inspected by the TEDS system.

[0004] Rare earth luminescent coatings have attracted the interest and research of many researchers due to their controllable morphology and size, good biocompatibility, high fluorescence purity, and good physicochemical stability. For example, Chinese invention patent application CN110982406A (publication date April 10, 2020) discloses a rare earth luminescent complex composed of bismuth oxide (Bi2O3) and europium oxide (Eu2O3), as well as a low-temperature resistant and crack-resistant waterborne fluorescent coating including this rare earth luminescent complex.

[0005] The chemical composition, morphology, size, and spatial structure of rare-earth luminescent materials have a significant and decisive influence on their physical and chemical properties. Therefore, designing and synthesizing special rare-earth luminescent coatings according to specific needs is of great importance for improving their performance and exploring their potential applications. Studies have found that lanthanide complexes can enhance the luminescence intensity of rare-earth ions due to their unique luminescent properties; however, lanthanides are difficult to purify and are costly. Exploring high-performance, low-cost rare-earth complexes is one of the popular research directions in the development of fluorescent coatings.

[0006] Fluorescent coatings are commonly applied to tunnels, building facades, billboards, etc., and are exposed to the elements for extended periods, suffering from rain, snow, and wind erosion. Furthermore, fluorescent coatings often use polyester resin as a matrix, which is prone to hydrolysis in humid environments and reacts easily with acidic media. Therefore, outdoor fluorescent coatings frequently exhibit corrosion, aging, and peeling. To improve the water resistance and other properties of fluorescent coatings, various polymer coating compounding schemes have emerged in the existing technology. For example, Chinese invention patent application CN116622284A (publication date August 22, 2023) discloses a vibrant coating that uses a compound of polyurethane acrylate, epoxy acrylate, and polyester acrylate as the main raw materials, achieving resistance to peeling even after boiling in water at 80℃ for 1 hour.

[0007] As the application scenarios of fluorescent coatings continue to expand, the demand for fluorescent coatings that are easy to prepare, environmentally friendly, low-cost, corrosion-resistant, and have high luminous efficiency is far from being met. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a novel fluorescent labeling material and its preparation method. The fluorescent labeling material of this invention has a reasonable formulation, high stability, and high and stable fluorescence intensity. It can be applied in various fields such as anti-counterfeiting labels, traffic signs, elastic materials, chemical detection, and fluorescent inks. When applied to bogies and undercarriage equipment compartments of high-speed trains, it can improve the recognizability of anti-loosening markings on high-speed trains.

[0009] Therefore, the present invention adopts the following technical solution:

[0010] A novel fluorescent labeling material composition, comprising the following raw materials in parts by weight:

[0011] 4-14 parts fluorescent powder, 18-35 parts ethylene glycol, 30-50 parts waterborne polyurethane dispersion, 10-21 parts acrylic resin, 5-15 parts pure acrylic emulsion, 8-15 parts polyethylene glycol, and 65-160 parts water.

[0012] Preferably, the novel fluorescent labeling material composition comprises, by weight, the following raw materials:

[0013] 5-12 parts fluorescent powder, 20-30 parts ethylene glycol, 35-49 parts waterborne polyurethane dispersion, 15-21 parts acrylic resin, 5-10 parts pure acrylic emulsion, 10-15 parts polyethylene glycol, and 70-150 parts water.

[0014] Preferably, the raw material composition of the phosphor includes Sr(NO3)2, Al(NO3)3, urea, Ce(NO3)3, Tb(NO3)3 and Eu(NO3)3, with a molar ratio of:

[0015] Sr(NO3)2:Al(NO3)3:urea:Ce(NO3)3:Tb(NO3)3:Eu(NO3)3 = (100-150):(200-300):(900-1000):(1-10):(1-90):(1-10);

[0016] A more preferred molar ratio is:

[0017] Sr(NO3)2:Al(NO3)3:urea:Ce(NO3)3:Tb(NO3)3:Eu(NO3)3 = 100:200:1000:1:(10-30):7.

[0018] Preferably, the phosphor is prepared by the following method:

[0019] Based on the total weight of Sr(NO3)2, Al(NO3)3 and urea, Sr(NO3)2, Al(NO3)3 and urea were dissolved in an anhydrous ethanol-water mixed solution in 9-12 times their weight, stirred, and Ce(NO3)3, Eu(NO3)3 and Tb(NO3)3 were added and stirred. The resulting white suspension was transferred to a reaction vessel and reacted at 200-250℃ for 20-24 h. After the reaction was completed, the mixture was naturally cooled, filtered, and the filter cake was washed with water and anhydrous ethanol alternately 1-3 times. After drying, the phosphor was obtained.

[0020] In the anhydrous ethanol-water mixed solution, the volume ratio of anhydrous ethanol to water is (2-3):1.

[0021] Preferably, in the anhydrous ethanol-water mixed solution, the volume ratio of anhydrous ethanol to distilled water is 3:1.

[0022] Preferably, based on the total weight of Sr(NO3)2, Al(NO3)3, and urea, Sr(NO3)2, Al(NO3)3, and urea are dissolved in 10 times their weight of the anhydrous ethanol-water mixed solution.

[0023] Preferably, in the preparation of the above-mentioned phosphor, the drying parameters are 40-60℃ for 2-4 hours.

[0024] Preferably, the particle size of the aqueous polyurethane dispersion is 0.01-1µm; more preferably, it is 0.1-0.8µm.

[0025] The aqueous polyurethane dispersion can be anionic, cationic, or nonionic.

[0026] Preferably, the acrylic resin has a weight-average molecular weight of 65,000-90,000.

[0027] As a preferred embodiment, the novel fluorescent labeling material composition provided by the present invention wherein the weight ratio of the aqueous polyurethane dispersion, acrylic resin and pure acrylic emulsion is (6-7):(3-4):1; more preferably 7:3:1.

[0028] Preferably, the polyethylene glycol is selected from polyethylene glycol 2000, polyethylene glycol 4000 and polyethylene glycol 6000.

[0029] More preferably, the polyethylene glycol is polyethylene glycol 4000.

[0030] Another objective of this invention is to provide a method for preparing a fluorescent coating, using the above-mentioned novel fluorescent labeling material composition as raw material, comprising the following steps:

[0031] (1) Prepare each raw material component according to the weight parts;

[0032] (2) In a container equipped with a stirring device, the fluorescent powder and ethylene glycol are mixed and stirred evenly; then the aqueous polyurethane dispersion and acrylic resin are added, stirred, heated to 50-70℃, and kept at the temperature for 2-3 hours to obtain the emulsifier precursor.

[0033] (3) Add polyethylene glycol to the emulsifier precursor obtained in step (2) and react at 50-70°C for 2-3 hours to obtain an emulsion emulsifier;

[0034] (4) The emulsion emulsifier obtained in step (3) is naturally cooled to room temperature, pure acrylic emulsion and water are added, stirred for 10-20 minutes, and then dispersed at high speed for 1-2 hours to obtain the fluorescent coating.

[0035] Preferably, in step (4), the high-speed dispersion rotation speed is 100-200 r / min.

[0036] Another objective of this invention is to provide a fluorescent coating prepared by the above method.

[0037] Furthermore, the present invention also provides the application of the fluorescent coating in anti-loosening marks and / or indicator marks.

[0038] The application of the anti-loosening mark refers to applying the fluorescent coating to the surface of the fastener. Once the nut loosens, the fluorescent mark will deform, thus indicating that the fastener is loose.

[0039] This invention uses a hydrothermal method to synthesize rare earth phosphors, characterized by liquid-phase reaction. Under high temperature and high pressure conditions, by controlling the amount of rare earth added, a special metastable phosphor that can emit different colors is obtained.

[0040] This invention combines pure acrylic emulsion with polyurethane resin and acrylic resin in a specific ratio, overcoming the shortcomings of acrylic resin and improving the physical properties of polyurethane resin, thereby enhancing the weather resistance, aging resistance, and color and gloss retention of the coating. Waterborne polyurethane dispersions (polyurethane resin without emulsifiers) contain urethane linkages in their structure, resulting in excellent abrasion resistance and toughness after film formation. Acrylic resins have high light transmittance, strong oil resistance, good oxidation resistance, and excellent weather resistance, exhibiting strong adhesion to both polar and non-polar surfaces. However, acrylic resins suffer from drawbacks such as high film-forming temperature, low film hardness, poor anti-tack properties, and poor water resistance, limiting their widespread application. The inventors discovered that combining acrylic resin with pure acrylic emulsion and waterborne polyurethane dispersion in a specific ratio can overcome the shortcomings of acrylic resin and improve the physical properties of polyurethane resin (pencil hardness, impact strength, flexibility, and solvent resistance), thereby enhancing the weather resistance, toughness, and abrasion resistance of the coating. Furthermore, waterborne polyurethane dispersions are relatively expensive. Combining them with acrylic resin and pure acrylic emulsion can reduce the amount of waterborne polyurethane dispersion used, thus saving costs while improving the performance of the fluorescent coating described in this invention. However, the amounts of acrylic resin and pure acrylic emulsion must be strictly controlled; excessive addition of these two substances will lead to a decrease in the overall performance of the coating.

[0041] Polyethylene glycol (PEG) is used as a crosslinking agent for polyurethane resins. Appropriate crosslinking strength can produce fluorescent coatings with excellent mechanical strength, elasticity, wear resistance, and oil resistance. PEG 4000, with its moderate molecular weight, is a preferred crosslinking agent in this invention. The inventors discovered that controlling the amount of PEG 4000 added can also improve the toughness and compressive strength of the fluorescent coating. This may be because: firstly, PEG 4000 can act as a toughening agent and emulsifying stabilizer for polyurethane and acrylic resins, absorbing external energy when the coating is subjected to external impact, preventing the material's cracks from easily propagating and causing fracture, thus achieving a toughening effect; secondly, PEG 4000 can impart a suitable viscosity to the system, forming a stable cell structure with relatively thick cell walls, which can act as a buffer when subjected to external pressure, thereby resulting in excellent compressive strength of the coating. However, if too much PEG 4000 is added, it will lead to over-crosslinking, which will reduce the performance of the prepared fluorescent coating.

[0042] Unless otherwise specified, "water" in this instruction manual refers to purified water, deionized water, etc.

[0043] In this instruction manual, the weight parts of the raw materials refer to the mass ratio between the raw materials, not the actual mass number. Depending on the actual situation, 1 part by weight can be any mass number, such as 1g, 2g, 5g, 10g, 50g, 500g, 1kg, etc.; it can even be a non-integer mass number, such as 1 part by weight can be 5.1g, 10.5g, 30.2g, etc. Detailed Implementation

[0044] The present invention will be described below with reference to specific embodiments. Those skilled in the art will understand that these embodiments are for illustrative purposes only and do not limit the scope of the invention in any way.

[0045] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, all raw materials, reagents, and other materials used in the following examples are commercially available products. Specifically:

[0046] Waterborne polyurethane dispersion: HYDRAN, a waterborne polyurethane dispersion from the DISEN Group;

[0047] Acrylic resin: VONCOAT acrylic resin from DISEN Group;

[0048] Pure acrylic emulsion: S-05 pure acrylic emulsion from Shengda New Materials;

[0049] Polyethylene glycol 8000 and polyethylene glycol 4000, Sinopharm Chemical Research Co., Ltd.

[0050] Example 1 A fluorescent coating

[0051] (1) Mix 5.0 g of fluorescent powder and 20.0 g of ethylene glycol and stir, then add 35.0 g of waterborne polyurethane dispersion and 15.0 g of acrylic resin, stir at 70°C and keep warm for 2 h to obtain emulsifier precursor;

[0052] (2) Add 10.0 g of polyethylene glycol 4000 to the emulsifier precursor obtained in step (1) and keep it at 70°C for 2 hours to obtain the emulsion emulsifier;

[0053] (3) The emulsion emulsifier obtained in step (2) is cooled to 50°C, and 5.0 g of pure acrylic emulsion and 70.0 g of deionized water are added. The mixture is dispersed at high speed at 150 r / min for 1 h to obtain the fluorescent coating.

[0054] The preparation method of the phosphor used in step (1) is as follows:

[0055] 0.1 mol Sr(NO3)2, 0.2 mol Al(NO3)3 and 1 mol urea were dissolved in 1100 g of anhydrous ethanol-deionized water mixed solution (anhydrous ethanol: distilled water = 2.5:1 (v / v)). The mixture was stirred, and then 1 mmol Ce(NO3)3, 10 mmol Tb(NO3)3 and 7 mmol Eu(NO3)3 were added. The mixture was stirred, and the resulting white suspension was transferred to a stainless steel reactor lined with polytetrafluoroethylene. The reactor was sealed and kept at 250℃ for 24 h. After the reaction was completed, the mixture was allowed to cool naturally, filtered, and the filter cake was collected. The filter cake was washed three times each with deionized water and anhydrous ethanol, and then dried at 50℃ for 3 h to obtain the phosphor.

[0056] Example 2 A fluorescent material

[0057] (1) Mix 12.0 g of phosphor and 30.0 g of ethylene glycol and stir, then add 48.0 g of waterborne polyurethane dispersion and 15.0 g of acrylic resin, stir at 60°C and keep warm for 2 h to obtain emulsifier precursor;

[0058] (2) Add 15.0 g of polyethylene glycol 4000 to the emulsifier precursor obtained in step (1) and keep it at 60°C for 2 hours to obtain the emulsion emulsifier;

[0059] (3) The emulsion emulsifier obtained in step (2) is cooled to 50°C, 8 g of pure acrylic emulsion and 150.0 g of deionized water are added, and the mixture is dispersed at high speed at 100 r / min for 1 h to obtain the fluorescent coating.

[0060] The preparation process parameters and methods of the phosphor in this embodiment are basically the same as those of the phosphor in Example 1, except that the amount of Tb(NO3)3 added during the preparation process of the phosphor is 20 mmol.

[0061] Example 3 A fluorescent material

[0062] (1) Mix 10.0 g of fluorescent powder and 25.0 g of ethylene glycol and stir, then add 49.0 g of waterborne polyurethane dispersion and 21.0 g of acrylic resin, stir at 70°C and keep warm for 2 h to obtain emulsifier precursor;

[0063] (2) Add 10.0 g of polyethylene glycol 4000 to the emulsifier precursor obtained in step (1) and keep it warm for 2 h to obtain the emulsion emulsifier;

[0064] (3) The emulsion emulsifier obtained in step (2) is cooled to 50°C, and 8.0 g of pure acrylic emulsion and 120.0 g of deionized water are added. The mixture is dispersed at 100 r / min for 1 h to obtain the fluorescent coating.

[0065] The preparation process parameters and methods of the phosphor in this embodiment are basically the same as those of the phosphor in Example 1, except that the amount of Tb(NO3)3 added during the preparation of the phosphor is 30 mmol.

[0066] Example 4 A fluorescent material

[0067] The preparation process parameters and procedures of the fluorescent coating in this embodiment are basically the same as those in Example 1. The difference is that the polyethylene glycol used is polyethylene glycol 8000, and the amount of Tb(NO3)3 added during the preparation of the fluorescent powder is 50 mmol.

[0068] Example 5 A fluorescent material

[0069] The preparation process parameters and procedures of the fluorescent coating in this embodiment are basically the same as those in Example 1, except that the amount of Eu(NO3)3 added during the preparation of the fluorescent powder is 1 mmol.

[0070] Example 6 A fluorescent material

[0071] (1) Mix 6.0 g of fluorescent powder and 25.0 g of ethylene glycol and stir, then add 36.0 g of waterborne polyurethane dispersion and 28.0 g of acrylic resin, stir at 70°C and keep warm for 2 h to obtain emulsifier precursor;

[0072] (2) Add 10.0 g of polyethylene glycol 4000 to the emulsifier precursor obtained in step (1) and keep it warm for 2 h to obtain the emulsion emulsifier;

[0073] (3) The emulsion emulsifier obtained in step (2) is cooled to 50°C, 7.0 g of pure acrylic emulsion and 80.0 g of deionized water are added, and the mixture is dispersed at 200 r / min for 1 h to obtain the fluorescent coating.

[0074] The preparation process parameters and methods of the phosphor used in step (1) are the same as those of the phosphor in Example 1.

[0075] Example 7 A fluorescent material

[0076] The preparation process parameters and procedures of the fluorescent coating in this embodiment are basically the same as those in Example 1. The difference is that in the preparation process of the fluorescent powder, the volume ratio of ethanol to deionized water in the anhydrous ethanol-deionized water mixed solution is 5:1.

[0077] Example 8 A fluorescent material

[0078] The preparation process parameters and procedures of the fluorescent coating in this embodiment are basically the same as those in Example 1. The difference is that the polyethylene glycol used is polyethylene glycol 2000, and the amount of Tb(NO3)3 added during the preparation of the fluorescent powder is 50 mmol.

[0079] Example 9 A fluorescent material

[0080] The preparation process parameters and procedures of the fluorescent coating in this embodiment are basically the same as those in Example 1. The difference is that the polyethylene glycol used is polyethylene glycol 6000, and the amount of Tb(NO3)3 added during the preparation of the fluorescent powder is 50 mmol.

[0081] Test case

[0082] According to the coating industry standard GB / T22374-2018, the fluorescent coatings prepared in the above examples were tested, and the performance test results are shown in Table 1.

[0083] Table 1 Results of Fluorescent Coating Performance Tests

[0084]

[0085] As shown in Table 1, the fluorescent coatings prepared in Examples 1-3 have rich colors, strong fluorescence intensity, and good wear resistance, flexibility, weather resistance, adhesion and impact resistance.

[0086] The polyethylene glycol used in Example 4 has a molecular weight of 8000, which causes excessive cross-linking of the polyurethane resin and acrylic resin, resulting in poor flexibility, adhesion and impact resistance of the fluorescent coating.

[0087] In Example 5, the doping amount of Eu(NO3)3 was changed, making Eu 3+ With Tb 3+ The change in the doping ratio between them results in a weaker fluorescence intensity in the prepared fluorescent coating.

[0088] In Example 6, the waterborne polyurethane dispersion and acrylic resin added during the preparation of the fluorescent coating had a mass ratio of 9:7. The amount of acrylic resin added was too much. Due to its disadvantages such as high film-forming temperature, low film hardness, poor anti-tack, poor water resistance, and poor adhesion, the fluorescent coating had poor wear resistance, flexibility, adhesion, and impact strength.

[0089] In Example 7, the ethanol-deionized water mixed solution used in the preparation process of the phosphor has a high ethanol content, which will cause the reactants to be unevenly dispersed in the ethanol, resulting in low phosphor luminescence intensity, and thus the prepared fluorescent coating has weak fluorescence intensity.

[0090] The fluorescent coatings prepared in Examples 8 and 9 have better performance than those in Examples 4-7, but their impact resistance is slightly lower than that in Examples 1-3.

[0091] In summary, this invention provides a novel fluorescent coating. Through the compounding of its components, the fluorescent coating of this invention exhibits high luminescence intensity, wear resistance, flexibility, weather resistance, strong adhesion, and impact resistance. In addition to being used as a fluorescent marking coating, it is particularly suitable as an anti-loosening fluorescent coating for fasteners, especially those involved in rail transit facilities.

Claims

1. A fluorescent labeling material composition, comprising, by weight, the following raw materials: 4-14 parts fluorescent powder, 18-35 parts ethylene glycol, 30-50 parts aqueous polyurethane dispersion, 10-21 parts acrylic resin, 5-15 parts pure acrylic emulsion, 8-15 parts polyethylene glycol, 65-160 parts water; in, The raw material composition of the phosphor includes Sr(NO3)2, Al(NO3)3, urea, Ce(NO3)3, Tb(NO3)3 and Eu(NO3)3, with a molar ratio of: Sr(NO3)2:Al(NO3)3:urea:Ce(NO3)3:Tb(NO3)3:Eu(NO3)3 = (100-150):(200-300):(900-1000):(1-10):(1-90):(1-10).

2. The fluorescent labeling material composition according to claim 1, characterized in that, The phosphor raw material composition includes Sr(NO3)2, Al(NO3)3, urea, Ce(NO3)3, Tb(NO3)3, and Eu(NO3)3, with a molar ratio of: Sr(NO3)2:Al(NO3)3:urea:Ce(NO3)3:Tb(NO3)3:Eu(NO3)3 = 100:200:1000:1:(10-30):

7.

3. The fluorescent labeling material composition according to claim 1 or 2, characterized in that, The phosphor is prepared by the following method: Based on the total weight of Sr(NO3)2, Al(NO3)3 and urea, Sr(NO3)2, Al(NO3)3 and urea were dissolved in an anhydrous ethanol-water mixed solution in 9-12 times their weight, stirred, and Ce(NO3)3, Eu(NO3)3 and Tb(NO3)3 were added and stirred. The resulting white suspension was transferred to a reaction vessel and reacted at 200-250℃ for 20-24 h. After the reaction was completed, the mixture was naturally cooled, filtered, and the filter cake was washed with water and anhydrous ethanol alternately 1-3 times. After drying, the phosphor was obtained. In the anhydrous ethanol-water mixed solution, the volume ratio of anhydrous ethanol to water is (2-3):

1.

4. The fluorescent labeling material composition according to claim 3, characterized in that, In the anhydrous ethanol-water mixed solution, the volume ratio of anhydrous ethanol to water is 3:

1.

5. The fluorescent labeling material composition according to claim 3, characterized in that, Based on the total weight of Sr(NO3)2, Al(NO3)3, and urea, Sr(NO3)2, Al(NO3)3, and urea were dissolved in 10 times their weight of the anhydrous ethanol-water mixed solution.

6. The fluorescent labeling material composition according to claim 3, characterized in that, In the preparation of the phosphor, the drying parameters are 40-60℃ for 2-4 hours.

7. The fluorescent labeling material composition according to any one of claims 1 to 6, characterized in that, By weight, it includes the following ingredients: 5-12 parts fluorescent powder, 20-30 parts ethylene glycol, 35-49 parts waterborne polyurethane dispersion, 15-21 parts acrylic resin, 5-10 parts pure acrylic emulsion, 10-15 parts polyethylene glycol, and 70-150 parts water.

8. The fluorescent labeling material composition according to claim 1 or 7, characterized in that, The particle size of the aqueous polyurethane dispersion is 0.01-1µm.

9. The fluorescent labeling material composition according to claim 8, characterized in that, The particle size of the aqueous polyurethane dispersion is 0.1-0.8µm.

10. The fluorescent labeling material composition according to claim 1 or 7, characterized in that, The aqueous polyurethane dispersion is selected from anionic, cationic, or nonionic types.

11. The fluorescent labeling material composition according to claim 8, characterized in that, The aqueous polyurethane dispersion is selected from anionic, cationic, or nonionic types.

12. The fluorescent labeling material composition according to claim 9, characterized in that, The aqueous polyurethane dispersion is selected from anionic, cationic, or nonionic types.

13. The fluorescent labeling material composition according to claim 1 or 7, characterized in that, The acrylic resin has a weight-average molecular weight of 65,000-90,000.

14. The fluorescent labeling material composition according to claim 1 or 7, characterized in that, The weight ratio of the aqueous polyurethane dispersion, acrylic resin, and pure acrylic emulsion is (6-7):(3-4):

1.

15. The fluorescent labeling material composition according to claim 14, characterized in that, The weight ratio of the aqueous polyurethane dispersion, acrylic resin, and pure acrylic emulsion is 7:3:

1.

16. The fluorescent labeling material composition according to claim 1 or 7, characterized in that, The polyethylene glycol is selected from one of polyethylene glycol 2000, polyethylene glycol 4000 and polyethylene glycol 6000.

17. The fluorescent labeling material composition according to claim 16, characterized in that, The polyethylene glycol is polyethylene glycol 4000.

18. A method for preparing a fluorescent coating, using the fluorescent labeling material composition of any one of claims 1 to 17 as raw material, comprising the following steps: (1) Prepare each raw material component according to the weight parts; (2) In a container equipped with a stirring device, the fluorescent powder and ethylene glycol are mixed and stirred evenly; then the aqueous polyurethane dispersion and acrylic resin are added, stirred, heated to 50-70℃, and kept at the temperature for 2-3 hours to obtain the emulsifier precursor. (3) Add polyethylene glycol to the emulsifier precursor obtained in step (2) and react at 50-70°C for 2-3 hours to obtain an emulsion emulsifier; (4) The emulsion emulsifier obtained in step (3) is naturally cooled to room temperature, pure acrylic emulsion and water are added, stirred for 10-20 minutes, and then dispersed at high speed for 1-2 hours to obtain the fluorescent coating.

19. The preparation method according to claim 18, characterized in that, In step (4), the high-speed dispersion rotation speed is 100-200 r / min.

20. A fluorescent coating prepared by the method of claim 18 or 19.

21. The use of the fluorescent coating of claim 20 in anti-loosening markings and / or indicator markings.

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