Fluorescent wear-resistant coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of coatings, in particular to a fluorescent wear-resistant coating as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, putting silicon carbide powder into an ethanol solution containing a silane coupling agent, stirring and reacting, and after the reaction is completed, sequentially cleaning and drying to obtain activated silicon carbide; s2, mixing the activated silicon carbide with fluorescent powder, adding water and a dispersing agent, and stirring and grinding to obtain silicon carbide composite slurry; and S3, mixing waterborne polyurethane, the silicon carbide composite slurry and an auxiliary agent, performing dispersion treatment to obtain slurry, and grinding the slurry to obtain the fluorescent wear-resistant coating. The prepared fluorescent wear-resistant coating can keep a fluorescent effect for a long time and has excellent wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a fluorescent wear-resistant coating and a preparation method and application thereof. Background Art

[0002] With the improvement of health awareness and the diversification of lifestyles, night running has gradually become popular around the world as a new form of exercise. Night running can not only help people release stress and exercise, but also enjoy the unique fun of sports in the quiet of the night. However, night running also faces some challenges, one of which is the problem of night visibility. In low-light environments, traditional upper materials are often difficult to be clearly identified by others, increasing the safety risks of night running.

[0003] In order to solve this problem, a series of shoe upper materials with night-time reflective or luminous functions have emerged on the market. However, most of these materials have problems such as limited reflective effect, short luminous time or insufficient wear resistance, which are difficult to meet the actual needs of night running enthusiasts.

[0004] The Chinese invention patent with publication number CN106242370A discloses a method for preparing an environmentally friendly wear-resistant fluorescent coating, which uses deionized water, wetting agent, dispersant, defoamer, anatase titanium dioxide, leveling agent, preservative, thickener, talcum powder, aluminum silicate, air purifier, energy storage luminous powder, adhesive, lubricant and enhancer to prepare a wear-resistant fluorescent UV-curable water-based coating, which can enhance the decorative effect. However, its fluorescent materials and wear-resistant fillers only rely on simple compounding, which is easy to cause poor adhesion and performance of the coating due to differences in surface properties. Therefore, it is particularly important to develop a shoe upper coating that can emit bright fluorescence at night and has excellent wear resistance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a fluorescent wear-resistant coating with excellent fluorescent performance and wear-resistant performance, and a preparation method and application thereof.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing a fluorescent wear-resistant coating, comprising the following steps:

[0007] S1: putting silicon carbide powder into an ethanol solution containing a silane coupling agent and stirring the solution to react, and after the reaction is completed, washing and drying the solution in sequence to obtain activated silicon carbide;

[0008] S2: Mixing activated silicon carbide and phosphor, adding water and dispersant, stirring and grinding, and obtaining silicon carbide composite slurry;

[0009] S3: Mixing and dispersing the waterborne polyurethane, silicon carbide composite slurry and additives to obtain slurry, grinding the slurry to obtain a fluorescent wear-resistant coating.

[0010] Another technical solution adopted by the present invention is: the fluorescent wear-resistant coating is prepared by the above-mentioned preparation method of the fluorescent wear-resistant coating.

[0011] Another technical solution adopted by the present invention is: the application of the above-mentioned fluorescent wear-resistant coating on the upper printed coating comprises the following steps: adding a curing agent to the fluorescent wear-resistant coating and the water-based polyurethane coating respectively to obtain a fluorescent wear-resistant slurry and a water-based polyurethane slurry; printing the water-based polyurethane slurry on a mesh and drying it to obtain a water-based polyurethane coating; printing the fluorescent wear-resistant slurry on the water-based polyurethane coating, and drying and curing it to obtain the upper printed coating.

[0012] The beneficial effects of the present invention are as follows: the preparation method of the fluorescent wear-resistant coating of the present invention mixes activated silicon carbide with fluorescent powder, and the surface of the silicon carbide activated by the silane coupling agent has greater activity, so that the fluorescent powder is evenly dispersed and attached on the surface of the silicon carbide, and then it is added to the water-based polyurethane in the form of a slurry fluid to form a uniformly dispersed state. The prepared fluorescent wear-resistant coating can maintain the fluorescent effect for a long time and has excellent wear resistance. DETAILED DESCRIPTION

[0013] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0014] A method for preparing a fluorescent wear-resistant coating comprises the following steps:

[0015] S1: putting silicon carbide powder into an ethanol solution containing a silane coupling agent and stirring the solution to react, and after the reaction is completed, washing and drying the solution in sequence to obtain activated silicon carbide;

[0016] S2: Mixing activated silicon carbide and phosphor, adding water and dispersant, stirring and grinding, and obtaining silicon carbide composite slurry;

[0017] S3: Mixing and dispersing the waterborne polyurethane, silicon carbide composite slurry and additives to obtain slurry, grinding the slurry to obtain a fluorescent wear-resistant coating.

[0018] From the above description, it can be seen that the beneficial effects of the present invention are: the compatibility of the fluorescent powder with the polymer matrix is ​​limited, which will lead to reduced fluorescence effect or unstable coating performance. Silicon carbide has high hardness and high wear resistance, which can significantly improve the wear resistance of the coating, but its ability to bind with organic matter is weak, and it is easy to agglomerate or disperse unevenly in the coating. Waterborne polyurethane coatings not only have good film-forming properties and adhesion, but also give the upper a certain flexibility and elasticity. However, the waterborne polyurethane coatings currently used in the market have low wear resistance and cannot meet the requirements of sports shoes for high quality, wear resistance and scratch resistance.

[0019] The present invention uses waterborne polyurethane as a coating matrix, silicon carbide as a wear-resistant filler, and fluorescent powder as a fluorescent material. Silicon carbide is surface activated by a silane coupling agent to increase its surface active groups, which is conducive to the attachment and dispersion of the fluorescent powder; then it is added to the waterborne polyurethane in the form of a slurry fluid to form a liquid coating, and a uniformly dispersed state is formed in the waterborne polyurethane, so that the fluorescent wear-resistant coating can maintain a fluorescent effect for a long time and has excellent wear resistance. The prepared fluorescent wear-resistant coating for the upper can effectively improve the compatibility of the fluorescent material and the wear-resistant filler in the waterborne polyurethane, improve the fluorescence time and wear resistance of the coating, and take into account the flexibility of the upper; it not only solves the visibility problem in night running, but also improves the wear resistance and scratch resistance of the upper, greatly increases the overall performance and service life of the shoes, and has broad market prospects and application value.

[0020] Furthermore, the concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent is 1-2 wt %.

[0021] From the above description, it can be known that the silane coupling agent is prepared into a solution, which is conducive to the dispersion of the silane coupling agent on the surface of the material, wherein the solvent is an ethanol solution prepared from water and ethanol with a volume concentration of 60%.

[0022] Furthermore, the silane coupling agent is silane coupling agent KH-550.

[0023] Furthermore, the reaction time in S1 is 2 to 4 hours.

[0024] Furthermore, the cleaning in S1 is performed using deionized water and ethanol solvent.

[0025] Furthermore, the phosphor is SrAl2O4:(Eu 2+ ,Dy 3+ ).

[0026] From the above description, it can be seen that SrAl2O4:(Eu 2+ ,Dy 3+) is a nano-scale powder and is currently the luminescent material with the best long afterglow performance in the aluminate system. Due to its high luminous intensity, long afterglow time, stable chemical properties, and no pollution, it is widely used in printing, coatings, ceramics, textiles and other fields.

[0027] Furthermore, the dispersant is polyvinyl pyrrolidone (PVP).

[0028] From the above description, it can be seen that polyvinyl pyrrolidone has good solubility and dispersibility, can be effectively adsorbed on the surface of silicon carbide and phosphor, and is suitable as a polymer dispersant for solvent-based industrial coatings.

[0029] Furthermore, the silicon carbide composite slurry includes, by weight percentage, 55-65% of a mixture of activated silicon carbide and phosphor, 25-30% of water, and 10-15% of a dispersant.

[0030] Preferably, the weight ratios of the mixture, water and dispersant are 60%, 28% and 12%.

[0031] It can be seen from the above description that the present invention improves the dispersibility of activated silicon carbide in waterborne polyurethane, thereby reducing the use of dispersants.

[0032] Furthermore, the mass ratio of activated silicon carbide to phosphor is 1 to 3:1.

[0033] Preferably, the mass ratio of activated silicon carbide to phosphor is 3:1.

[0034] From the above description, it can be seen that too much phosphor content will cause the phosphor to be unable to be loaded on silicon carbide and become free, which is easy to agglomerate and settle, and difficult to disperse; too little content will affect the luminous efficiency. Therefore, the mass ratio of activated silicon carbide to phosphor is controlled to be 3:1.

[0035] Furthermore, by mass percentage, 60-70 wt % of waterborne polyurethane, 15-30 wt % of silicon carbide composite slurry and 8-20 wt % of auxiliary agent are added to S3.

[0036] Furthermore, the solid content of the waterborne polyurethane is 50-60%, the elongation at break is greater than or equal to 500%, and the pH value is 7-9.

[0037] From the above description, it can be seen that when the solid content of the waterborne polyurethane is 50-60%, the thickness stability of the coating is better, and when the pH value is 7-9, the viscosity stability of the coating slurry is better.

[0038] Furthermore, the auxiliary agent includes at least one of polyvinyl pyrrolidone, an acrylic thickener, a defoaming agent and a pH adjuster.

[0039] Furthermore, the defoaming agent includes at least one of polyvinyl alcohol, polysilicone, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate and polyoxyethylene octanol ether.

[0040] Another technical solution adopted by the present invention is: the fluorescent wear-resistant coating is prepared by the above-mentioned preparation method of the fluorescent wear-resistant coating.

[0041] Another technical solution adopted by the present invention is: the application of the above-mentioned fluorescent wear-resistant coating on the upper printed coating comprises the following steps: adding a curing agent to the fluorescent wear-resistant coating and the water-based polyurethane coating respectively to obtain a fluorescent wear-resistant slurry and a water-based polyurethane slurry; printing the water-based polyurethane slurry on a mesh and drying it to obtain a water-based polyurethane coating; printing the fluorescent wear-resistant slurry on the water-based polyurethane coating, and drying and curing it to obtain the upper printed coating.

[0042] From the above description, it can be seen that the lower layer of the upper printed coating prepared by the present invention is a water-based polyurethane coating to improve the adhesion, and the upper layer is a fluorescent wear-resistant coating, which can improve the fluorescence time and wear resistance of the coating while taking into account the flexibility of the upper.

[0043] Furthermore, the curing agent is at least one of isocyanate, ethylenetriamine, triethylenetetramine and diethylenetriamine.

[0044] Furthermore, the amount of curing agent added to the fluorescent wear-resistant slurry is 3-7% of the weight of the fluorescent wear-resistant coating.

[0045] Furthermore, the amount of curing agent added to the waterborne polyurethane slurry is 3-7% of the weight of the fluorescent wear-resistant coating.

[0046] Furthermore, the temperature of drying and drying curing is 50-80° C., and the time of drying curing is 7-8 hours.

[0047] Furthermore, the printing thickness of the fluorescent wear-resistant slurry is 0.6 to 2.0 mm.

[0048] Embodiment 1 of the present invention is: a method for preparing a fluorescent wear-resistant coating, the steps are as follows:

[0049] S1: Put silicon carbide powder into an ethanol solution containing silane coupling agent KH-550 and stir the solution at a stirring rate of 500 rpm for 3 hours. After the reaction is completed, wash it with deionized water for 3 times, wash it with ethanol solvent for 2 times, and then dry it in an oven at 60°C for 12 hours to obtain activated silicon carbide; the concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent is 2wt%, and the solvent is an ethanol solution with a volume concentration of 60% prepared by water and ethanol.

[0050] S2: 60g activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy3+ ) phosphor mixture, add 28g water and 12g polyvinyl pyrrolidone, stir at a stirring rate of 300rpm for 1h, and then transfer to a ball mill and grind at a rate of 200rpm for 3h to obtain a silicon carbide composite slurry; the mass ratio of activated silicon carbide to phosphor is 3:1.

[0051] S3: 65g of waterborne polyurethane, 25g of silicon carbide composite slurry and 10g of additives are mixed and dispersed to obtain a slurry, and the slurry is ground so that the particle size does not exceed 10μm to obtain a fluorescent wear-resistant coating; the solid content of the waterborne polyurethane is 56%, the elongation at break is greater than 500%, and the pH value is 8.2; the additives are composed of polyvinyl pyrrolidone, thickener Rheolate 278 (Deqian), water-based defoamer BYK-024 (Bick) and amine neutralizer AMP-95 (Angus) in a mass ratio of 1:1.2:0.3:0.2.

[0052] Embodiment 2 of the present invention is:

[0053] The difference between Example 2 and Example 1 is that the concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent in S1 is 1.5wt%; the activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy 3+ ) The amount of the phosphor mixture added is 57g, the amount of water added is 28g, and the amount of polyvinyl pyrrolidone added is 15g; the amount of water-based polyurethane added in S3 is 60g, the amount of silicon carbide composite slurry added is 30g, and the amount of additives added is 10g.

[0054] Embodiment 3 of the present invention is:

[0055] The difference between Example 3 and Example 1 is that the concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent in S1 is 1.0wt%; the activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy 3+ ) The amount of the phosphor mixture added is 58g, the amount of water added is 30g, the amount of polyvinyl pyrrolidone added is 12g, and the mass ratio of activated silicon carbide to phosphor is 2:1; the amount of water-based polyurethane added in S3 is 66g, the amount of silicon carbide composite slurry added is 20g, and the amount of additives added is 14g.

[0056] Embodiment 4 of the present invention is:

[0057] The difference between Example 4 and Example 1 is that the concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent in S1 is 1.8wt%; the activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy 3+) The amount of the phosphor mixture added is 65g, the amount of water added is 25g, the amount of polyvinyl pyrrolidone added is 10g, and the mass ratio of activated silicon carbide to phosphor is 2:1; the amount of water-based polyurethane added in S3 is 70g, the amount of silicon carbide composite slurry added is 20g, and the amount of additives added is 10g.

[0058] Embodiment 5 of the present invention is:

[0059] The difference between Example 5 and Example 1 is that the concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent in S1 is 1.2wt%; the activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy 3+ ) The amount of the phosphor mixture added is 58g, the amount of water added is 30g, the amount of polyvinyl pyrrolidone added is 12g, and the mass ratio of activated silicon carbide to phosphor is 1:1; the amount of water-based polyurethane added in S3 is 62g, the amount of silicon carbide composite slurry added is 30g, and the amount of additives added is 8g.

[0060] Comparative Example 1 of the present invention is:

[0061] The only difference between Comparative Example 1 and Example 1 is that silicon carbide is not activated but is directly mixed with the phosphor.

[0062] Comparative Example 2 of the present invention is:

[0063] The only difference between Comparative Example 2 and Example 1 is that silicon carbide is not activated, but the phosphor is activated.

[0064] Example 6 of the present invention is: using the fluorescent wear-resistant coatings of Examples 1 to 5 and Comparative Examples 1 to 3 to prepare a shoe upper printing coating, the steps are as follows:

[0065] S1: Add isocyanate curing agent to the fluorescent wear-resistant coating and the waterborne polyurethane coating respectively to obtain fluorescent wear-resistant slurry and waterborne polyurethane slurry, and stir for 3 minutes until the curing agent is completely integrated; the amount of curing agent added to the fluorescent wear-resistant slurry is 3% of the weight of the fluorescent wear-resistant coating, and the amount of curing agent added to the waterborne polyurethane slurry is 3% of the weight of the fluorescent wear-resistant coating; the waterborne polyurethane slurry is the waterborne polyurethane used in Example 1.

[0066] S2: Printing a waterborne polyurethane slurry with a thickness of 1.2 mm on a mesh cloth using a screen plate, and drying at 80° C. to obtain a waterborne polyurethane coating;

[0067] S3: Clean the screen, and use the silk screen to print a fluorescent wear-resistant slurry with a thickness of 2.0 mm on the water-based polyurethane coating, and dry and cure it at 80° C. for 7 hours to obtain a shoe upper printed coating.

[0068] The printed product prepared in Example 6 was tested.

[0069] 1. Test the wear resistance of each printed product

[0070] The printed product obtained in the application example was tested for wear resistance using a Taber wear tester. Referring to the standard QB T 4545-2013, the printed product was placed on a rotating platform, and the two friction wheels above it were driven to roll by the rotating platform. The friction wheels rotated and rubbed the printed product under the same load to wear the sample. One friction wheel faced outward, and the other friction wheel faced inward to rub the sample. The wear mark was an overlapping ring. After rubbing at a specified frequency, the number of circles when the cloth was worn out was recorded. The test results are shown in Table 1.

[0071] Table 1

[0072]

[0073] From the wear test results in Table 1, it can be seen that the surface activation of silicon carbide in advance can improve the wear resistance of the printed product printed with the fluorescent wear-resistant water-based coating to a certain extent. Compared with other products, the product obtained in Example 1 has better wear resistance.

[0074] 2. Test the bending resistance of each printed product

[0075] The printed product obtained in the above Example 6 was tested for bending resistance using a bending resistance tester. Referring to the standard QBT 3903.41-2008, a sample with a size of (70±1mm)×(45±1mm) was taken at the same position of the sample. First, the front or grain surface of the sample was folded inwards and one end of the sample was clamped in the upper clamp to ensure that the sample surfaces were in contact and the folding line was horizontal. Then the inside of the sample was folded outwards 90° and clamped in the lower clamp. In the lower clamp, the sample was also folded, the folding line was vertical, and the reverse side or flesh side of the sample was in contact. This test simulates the damage to the upper surface caused by the inward bending of the upper surface due to movement. During the test, the clamp swung at a constant rate and the sample was bent repeatedly. Dry or wet tests can be performed at room temperature, or dry tests can be performed below zero degrees. After reaching the specified number of swings, the test was stopped and the damage or salting out of the test was visually inspected. The bending resistance test results are shown in Table 2.

[0076] Table 2

[0077]

[0078] From the test results in Table 2, it is found that adding fluorescent wear-resistant water-based slurry can pass the bending resistance test of more than 70,000 times. From the experimental results in Tables 1 and 2, it can be seen that the fluorescent wear-resistant water-based coating prepared by the present invention, after printing processing, the obtained printed product has the advantages of being environmentally friendly, pollution-free, high in wear resistance and scratch resistance, and good in bending resistance.

[0079] 3. Test the fluorescence performance of each printed product

[0080] The afterglow performance test uses a PR-305 long afterglow fluorescence tester. At room temperature, the excitation light intensity is 1000lx and the simulated sunlight is continuously excited for 20 minutes. After the excitation, wait for 10 seconds, measure the afterglow brightness, and then start continuous sampling with a sampling interval of 1 second until the afterglow brightness decays to 0.000 32cd / m 2 After that, the acquisition ends. From the end of excitation to the decay of the afterglow to 0.000 32cd / m 2 The time is the afterglow time of the fluorescent coating.

[0081] Table 3

[0082] Fluorescent wear-resistant coating Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Afterglow time / h 20 18 13 16 15 8 12

[0083] From the afterglow time test results in Table 3, it can be seen that the surface activation of silicon carbide in advance can make the phosphor evenly dispersed and attached on the surface of silicon carbide, and added to the waterborne polyurethane in the form of slurry fluid to form a liquid coating, forming a uniformly dispersed state in the waterborne polyurethane, so that the fluorescent wear-resistant coating can maintain the fluorescent effect for a long time. The activation of the silicon carbide surface by silane coupling agent can better provide phosphor loading. If the phosphor is directly modified by silane coupling agent, the silane coupling agent will form a siloxane film on the surface of the luminous powder, thereby affecting the luminous efficiency of the phosphor.

[0084] Embodiment 7 of the present invention is: a method for preparing a fluorescent wear-resistant coating, the steps are as follows:

[0085] S1: Put silicon carbide powder into an ethanol solution containing silane coupling agent KH-550 and stir at a stirring rate of 500 rpm for 2 hours. After the reaction is completed, wash it with deionized water for 3 times, and then wash it with ethanol solvent for 2 times, and then dry it in an oven at 60°C for 12 hours to obtain activated silicon carbide; the concentration of silane coupling agent in the ethanol solution containing silane coupling agent is 2wt%.

[0086] S2: 55g activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy 3+) phosphor mixture, add 30g water and 15g polyvinyl pyrrolidone, stir at a stirring rate of 300rpm for 1h, and then transfer to a ball mill and grind at a rate of 200rpm for 3h to obtain a silicon carbide composite slurry; the mass ratio of activated silicon carbide to phosphor is 3:1.

[0087] S3: 65g of waterborne polyurethane, 15g of silicon carbide composite slurry and 20g of additives are mixed and dispersed to obtain a slurry, and the slurry is ground so that the particle size does not exceed 10μm to obtain a fluorescent wear-resistant coating; the solid content of the waterborne polyurethane is 50%, the elongation at break is equal to 500%, and the pH value is 7; the additives are composed of polyvinyl pyrrolidone, thickener Rheolate 278, water-based defoamer BYK-024 and amine neutralizer AMP-95 in a mass ratio of 1:1.2:0.3:0.2.

[0088] Embodiment 8 of the present invention is: a method for preparing a fluorescent wear-resistant coating, the steps are as follows:

[0089] S1: Put silicon carbide powder into an ethanol solution containing silane coupling agent KH-550 and stir at a stirring rate of 500 rpm for 4 hours. After the reaction is completed, wash it with deionized water for 3 times, and then wash it with ethanol solvent for 2 times, and then dry it in an oven at 60°C for 12 hours to obtain activated silicon carbide; the concentration of silane coupling agent in the ethanol solution containing silane coupling agent is 2wt%.

[0090] S2: 60g activated silicon carbide and SrAl2O4:(Eu 2+ ,Dy 3+ ) phosphor mixture, add 28g water and 12g polyvinyl pyrrolidone, stir at a stirring rate of 300rpm for 1h, and then transfer to a ball mill and grind at a rate of 200rpm for 3h to obtain a silicon carbide composite slurry; the mass ratio of activated silicon carbide to phosphor is 3:1.

[0091] S3: 65g of waterborne polyurethane, 25g of silicon carbide composite slurry and 10g of additives are mixed and dispersed to obtain a slurry, and the slurry is ground so that the particle size does not exceed 10μm to obtain a fluorescent wear-resistant coating; the solid content of the waterborne polyurethane is 60%, the elongation at break is greater than 500%, and the pH value is 9; the additives are composed of polyvinyl pyrrolidone, thickener Rheolate 278, water-based defoamer BYK-024 and amine neutralizer AMP-95 in a mass ratio of 1:1.2:0.3:0.2.

[0092] Embodiment 9 of the present invention is: the fluorescent wear-resistant coating prepared by the preparation method of embodiment 8.

[0093] Embodiment 10 of the present invention is: application of the fluorescent wear-resistant coating of embodiment 9 on a printed coating on a shoe upper, the steps are as follows:

[0094] S1: Add isocyanate curing agent to the fluorescent wear-resistant coating and the waterborne polyurethane coating respectively to obtain fluorescent wear-resistant slurry and waterborne polyurethane slurry, and stir for 5 minutes until the curing agent is completely integrated; the amount of curing agent added to the fluorescent wear-resistant slurry is 7% of the weight of the fluorescent wear-resistant coating, and the amount of curing agent added to the waterborne polyurethane slurry is 7% of the weight of the fluorescent wear-resistant coating.

[0095] S2: Printing a waterborne polyurethane slurry with a thickness of 0.3 mm on a mesh cloth using a screen plate, and drying at 50° C. to obtain a waterborne polyurethane coating;

[0096] S3: Clean the screen, and use the silk screen to print a fluorescent wear-resistant slurry with a thickness of 0.6 mm on the water-based polyurethane coating, and dry and cure it at 50° C. for 8 hours to obtain a shoe upper printed coating.

[0097] In summary, the fluorescent wear-resistant coating provided by the present invention and its preparation method and application have the following advantages:

[0098] 1. Waterborne polyurethane is used as the coating matrix, silicon carbide is used as the wear-resistant filler, SrAl2O4:(Eu 2+ ,Dy 3+ ) is a fluorescent material, and the surface activation of silicon carbide is carried out by a silane coupling agent, which is beneficial to the adhesion and dispersion of the fluorescent powder and improves the compatibility of the fluorescent material and the wear-resistant filler in the water-based polyurethane.

[0099] 2. Add activated silicon carbide and phosphor powder into waterborne polyurethane in the form of slurry fluid to form liquid coating, so as to further improve the uniformity of dispersion of fluorescent materials and wear-resistant fillers.

[0100] 3. Activating silicon carbide with silane coupling agent can better provide phosphor loading without destroying the structure of the phosphor, and can better disperse evenly in the water-based resin, reducing the use of dispersants.

[0101] 4. The lower layer of the printed coating on the upper is a water-based polyurethane coating, and the upper layer is a fluorescent wear-resistant coating, which can improve the fluorescent time and wear resistance of the coating while taking into account the flexibility of the upper.

[0102] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the specification of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a fluorescent wear-resistant coating, characterized in that: The following steps are involved: S1: putting silicon carbide powder into an ethanol solution containing a silane coupling agent and stirring the solution to react, and after the reaction is completed, washing and drying the solution in sequence to obtain activated silicon carbide; S2: Mixing activated silicon carbide and phosphor, adding water and dispersant, stirring and grinding, and obtaining silicon carbide composite slurry; S3: Mixing and dispersing the waterborne polyurethane, silicon carbide composite slurry and additives to obtain slurry, grinding the slurry to obtain a fluorescent wear-resistant coating.

2. The method for preparing the fluorescent wear-resistant coating according to claim 1, characterized in that: The concentration of the silane coupling agent in the ethanol solution containing the silane coupling agent is 1-2 wt %.

3. The method for preparing the fluorescent wear-resistant coating according to claim 1, characterized in that: The reaction time in S1 is 2 to 4 hours.

4. The method for preparing the fluorescent wear-resistant coating according to claim 1, characterized in that: The cleaning in S1 is performed by using deionized water and ethanol solvent.

5. The method for preparing the fluorescent wear-resistant coating according to claim 1, characterized in that: Calculated by weight percentage, the silicon carbide composite slurry includes 55-65% of a mixture of activated silicon carbide and phosphor, 25-30% of water and 10-15% of a dispersant.

6. The method for preparing the fluorescent wear-resistant coating according to claim 1, characterized in that: In terms of mass percentage, 60-70 wt % of waterborne polyurethane, 15-30 wt % of silicon carbide composite slurry and 8-20 wt % of auxiliary agent are added to S3.

7. The method for preparing the fluorescent wear-resistant coating according to claim 1, characterized in that: The auxiliary agent includes at least one of polyvinyl pyrrolidone, acrylic thickener, defoamer and pH regulator.

8. A fluorescent wear-resistant coating prepared by the method for preparing a fluorescent wear-resistant coating according to any one of claims 1 to 7.

9. The use of the fluorescent wear-resistant coating as claimed in claim 8 on a printed coating on a shoe upper, characterized in that: The following steps are involved: Adding curing agent to the fluorescent wear-resistant coating and the waterborne polyurethane coating respectively to obtain fluorescent wear-resistant slurry and waterborne polyurethane slurry; Printing water-based polyurethane slurry on the mesh and drying it to obtain a water-based polyurethane coating; A fluorescent wear-resistant slurry is printed on the water-based polyurethane coating, and the upper printed coating is obtained after drying and curing.

10. The use of the fluorescent wear-resistant coating on the upper printing coating according to claim 9, characterized in that: The temperature of the drying and drying curing is 50-80° C., and the time of the drying curing is 7-8 hours.

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