Anti-skid coating for ship deck and preparation method of anti-skid coating

Abstract

The invention discloses an anti-skid coating for a ship deck and a preparation method, and belongs to the technical field of preparation of anti-skid materials. The coating is composed of matrix resin, a functional modification phase, a cross-linking curing system and an auxiliary agent, the matrix resin is prepared from 60 to 70 parts of hydroxyl-terminated polyurethane prepolymer and 20 to 30 parts of modified graphene oxide; the functional modification phase is prepared from the following components in parts by weight: 1.5 to 3 parts of hydroxylated graphene, 8 to 12 parts of mesoporous silicon dioxide microspheres and 2 to 3 parts of fluoroalkyl silane; the cross-linking curing system is prepared from 12 to 15 parts of isophorone diisocyanate and 0.1 to 0.3 part of dibutyltin dilaurate; the auxiliary agent is prepared from 0.5 to 1 part of phosphate ester antioxidant, 0.3 to 0.5 part of benzotriazole ultraviolet light absorber, 1 to 2 parts of carbon black and 3 to 5 parts of fumed silica. The anti-skid coating has economic practicability, the cost of the selected raw materials is lower than that of a fluorine-containing resin anti-skid coating, special equipment is not needed in the preparation process, the service life of the anti-skid coating can reach 8-10 years and is 2-3 times that of a traditional epoxy anti-skid coating, and the maintenance cost is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of anti-slip material preparation technology, specifically relating to an anti-slip coating for ship decks and its preparation method. Background Technology

[0002] With the development of modern technology, various technologies have extended from land to the sea. However, due to the long-term exposure of ship decks, helicopter platforms, passageways, and hatches to the high humidity, high salinity, and high temperature difference of the marine environment, they are highly susceptible to slippage accidents caused by seawater erosion, ultraviolet radiation, thermal expansion and contraction, and mechanical wear.

[0003] However, as a functional material ensuring the safety of personnel and equipment, the performance of anti-slip coatings directly determines the reliability and maintenance cycle of ships in harsh sea conditions. However, existing marine anti-slip coatings generally have many defects, such as: 1. Rapid degradation of anti-slip performance: The traditional "epoxy + anti-slip sand" system can achieve a friction coefficient of over 0.5 in a dry state, but rapidly drops to below 0.3 under wet or oily conditions, making it difficult to meet the minimum requirements of ≥0.45 for IMO and US military standards; moreover, with increasing wear cycles, surface roughness decreases, and the anti-slip performance shows an irreversible degradation trend. 2. Prone to cracking and peeling after seawater immersion: Due to the high brittleness and high glass transition temperature of the epoxy / polyamide system, cold brittleness occurs at around -20 ℃; under the thermal cycling of seawater at 40–60 ℃, the difference in linear expansion coefficients between the coating and the steel plate leads to concentration of interfacial shear stress, resulting in microcracks within 30 days, and blistering and peeling phenomena commonly appear after 90 days. Third, insufficient resistance to aging and salt spray. Existing coatings commonly add rigid particles such as corundum and silicon carbide to increase the coefficient of friction, but the particle-resin interface provides a rapid diffusion channel for corrosive media. After 1000 hours of salt spray testing, the rust width on one side of the scratch is >2 mm, and the surface shows chalking and loss of gloss, resulting in the failure of the microwave absorption / anti-corrosion functional layer. Fourth, poor environmental adaptability and frequent maintenance. For epoxy systems with a single dry film thickness of 300–500 μm, the color difference ΔE is >12 and the surface hardness decreases by 30% after 500 hours of accelerated UV aging. On average, local repairs are required every 12–18 months, and complete rework is necessary within 3–5 years, causing ships to be out of service and incurring high costs for docking.

[0004] In summary, developing a new type of marine anti-skid coating that can maintain a high coefficient of friction, prevent cracking, resist aging, be environmentally friendly, and can be applied quickly at room temperature under the combined effects of high humidity, high salt, strong ultraviolet radiation, thermal shock, and mechanical wear has become an urgent need to ensure the safe operation of marine equipment and reduce the maintenance costs throughout its life cycle. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a marine anti-slip coating and a preparation method thereof.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a marine anti-slip coating, which is composed of a base resin, a functional modified phase, a crosslinking curing system, and auxiliary additives; The matrix resin consists of 60-70 parts of hydroxyl-terminated polyurethane prepolymer and 20-30 parts of modified graphene oxide. The functional modified phase consists of 1.5-3 parts hydroxylated graphene, 8-12 parts mesoporous silica microspheres, and 2-3 parts fluoroalkylsilane. The cross-linking curing system consists of 12-15 parts isophorone diisocyanate and 0.1-0.3 parts dibutyltin dilaurate; The auxiliary agent consists of 0.5-1 parts of phosphate ester antioxidant, 0.3-0.5 parts of benzotriazole ultraviolet absorber, 1-2 parts of carbon black, and 3-5 parts of fumed silica.

[0007] Furthermore, the molecular weight of the hydroxyl-terminated polyurethane prepolymer is 3000-5000, and polybutylene adipate type soft segments are selected to improve low-temperature flexibility and seawater immersion resistance; the modified graphene oxide is modified by reacting an aminosilane coupling agent with GO to introduce amino functional groups on the GO surface.

[0008] Furthermore, the hydroxylated graphene has a sheet thickness of 1-5 nm and a lateral dimension of 5-10 μm; the mesoporous silica microspheres have a pore size of 2-5 nm and a particle size of 5-15 μm; and the fluoroalkylsilane is tridecafluorooctyltriethoxysilane.

[0009] Furthermore, the hydroxylated graphene has a sheet thickness of 1-5 nm and a lateral dimension of 5-10 μm; the mesoporous silica microspheres have a pore size of 2-5 nm and a particle size of 5-15 μm; and the fluoroalkylsilane is tridecafluorooctyltriethoxysilane.

[0010] Furthermore, the particle size of the carbon black is 20-30 nm.

[0011] Furthermore, a method for preparing an anti-slip coating for ship decks includes the following steps: S1. Hydroxylated graphene is added to N,N-dimethylformamide and dispersed by ultrasonication to form a graphene dispersion with a concentration of 0.5%; at the same time, mesoporous silica microspheres are soaked in a 5% (w / w) fluoroalkylsilane ethanol solution and then dried to complete the surface hydrophobic modification; then the graphene dispersion is mixed with the modified silica microspheres and stirred at high speed to form a functional modified phase; S2. Under nitrogen protection, the hydroxyl-terminated polyurethane prepolymer is heated to 60-70℃, and isophorone diisocyanate is slowly added and stirred for 1.5h to form -NCO-terminated prepolymer. Then, the temperature is lowered to 40℃, half of the functional modified phase is added and stirred, followed by the addition of modified graphene oxide and stirring. Then, the remaining half of the functional modified phase is added and stirred for 10-15min. Phosphate ester antioxidant, benzotriazole UV absorber, carbon black and fumed silica are added and stirred at high speed. Finally, dibutyltin dilaurate is added and stirred at a reduced speed, and degassing is performed for 30min to obtain the coating slurry. S3. After pre-treating the ship deck substrate, apply the coating slurry using a scraping method, controlling the wet film thickness to 150-200μm. First, pre-cur it in an 80℃ oven for 30 minutes, then use a 1064nm fiber laser to perform surface micro-etching, etching out a diamond-shaped grid texture with a depth of 5-8μm and a spacing of 20-30μm. Finally, fully cure it at 120℃ for 2 hours to form an anti-slip coating that combines macroscopic texture and microscopic rough structure.

[0012] Furthermore, the pretreatment method for the ship deck substrate is to sequentially perform sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment on the ship deck substrate.

[0013] Further, in step S1, after the hydroxylated graphene is added to N,N-dimethylformamide, the ultrasonic dispersion power is 300W and the time is 30min; the mesoporous silica microspheres are soaked in fluoroalkylsilane ethanol solution for 100-140min and dried at 55-65℃.

[0014] Further, in step S1, the graphene dispersion and the modified silica microspheres are mixed and stirred at 3000 r / min for 30 min.

[0015] Further, in step S2, the high-speed stirring condition is stirring at 2000 r / min for 45 min; the low-speed stirring condition is stirring at 500 r / min for 10 min.

[0016] The beneficial effects of this invention are as follows: 1. This invention utilizes the synergistic effect of a multi-level rough structure to prepare a hydroxyl-terminated polyurethane prepolymer with excellent weather resistance, UV resistance (non-yellowing), and mechanical properties, making it ideal for harsh marine environments. The mesoporous silica microspheres used form a nano- to micron-scale pore structure within the anti-slip coating, increasing the surface area. A macroscopic drainage channel is constructed using laser-etched diamond-shaped mesh textures to quickly drain surface water, preventing water film formation. Furthermore, graphene sheets form a three-dimensional conductive network within the coating, reducing water molecule adsorption through electrostatic interactions.

[0017] 2. This invention also utilizes a material interface enhancement mechanism. The hydroxylated graphene forms hydrogen bonds with the hydroxyl groups of the polyurethane prepolymer, which enhances the bonding strength between the filler and the matrix. At the same time, the substrate surface treated with silane coupling agent forms covalent bonds with the amino groups in the coating, which solves the problem of coating peeling. Fluoroalkylsilane-modified silica is used to reduce the surface energy of the coating (contact angle > 110°), achieving hydrophobicity and antifouling, and reducing the attachment of marine organisms.

[0018] 3. The present invention employs environmentally resistant aging protection. The sheet-like structure of graphene can block ultraviolet rays and oxygen penetration, thus slowing down coating aging; phosphate ester antioxidants capture free radicals and prevent polyurethane molecular chains from breaking; the porous structure of mesoporous silica can adsorb corrosive ions generated by seawater erosion, thus protecting the substrate. 4. The anti-slip coating of the present invention is economical and practical. The raw material cost of the present invention is lower than that of fluoropolymer anti-slip coatings (by about 30%), and the preparation process does not require special equipment. The service life of the anti-slip coating can reach 8-10 years, which is 2-3 times that of traditional epoxy anti-slip coatings, effectively reducing maintenance costs.

[0019] 5. The material of this invention is not merely "graphene," but rather a cross-linked network with modified graphene at its core, achieving a multi-functional synergy of reinforcement, toughening, thermal conductivity, and corrosion resistance. Furthermore, the anti-slip structure of this invention is not random, but a multi-level composite structure based on biomimetic principles (such as gecko toes and shark skin scales) and fluid dynamics simulations, simultaneously considering dry / wet anti-slip properties, drainage, and self-cleaning capabilities.

[0020] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the purpose, technical solution, and beneficial effects of the invention clearer, the following figures are provided for illustration: Figure 1 For invention; Figure 2 For invention The following labels are shown in the attached diagram: Detailed Implementation like Figure 1-2 As shown, the present invention provides an anti-slip coating for ship decks and a method for preparing it.

[0022] Example 1 S1. 2.2 parts of hydroxylated graphene were added to N,N-dimethylformamide and ultrasonically dispersed at 300 W for 30 min to form a graphene dispersion with a concentration of 0.5%; at the same time, 10 parts of mesoporous silica microspheres were soaked in 2.5 parts of 5% (w / w) fluoroalkylsilane ethanol solution for 120 min and then dried at 60 °C to complete the surface hydrophobic modification; then the graphene dispersion and modified silica microspheres were mixed and stirred at 3000 r / min for 30 min to form a functional modified phase; S2. Under nitrogen protection, 65 parts of hydroxyl-terminated polyurethane prepolymer were heated to 65°C, and 13.5 parts of isophorone diisocyanate were slowly added and stirred for 1.5 hours to form -NCO-terminated prepolymer. Then the temperature was lowered to 40°C, half of the functional modified phase was added and stirred, followed by 25 parts of modified graphene oxide and stirred until homogeneous. Then the remaining half of the functional modified phase was added and stirred for 10-15 minutes. Then 0.75 parts of phosphate ester antioxidant, 0.4 parts of benzotriazole UV absorber, 1.5 parts of carbon black and 4 parts of fumed silica were added and stirred at 2000 r / min for 45 minutes. Finally, 0.2 parts of dibutyltin dilaurate were added and stirred at 500 r / min for 10 minutes, followed by degassing for 30 minutes to obtain the coating slurry. S3. The ship deck substrate is subjected to sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment in sequence. Then, the coating slurry is applied by scraping, and the wet film thickness is controlled at 175μm. It is first pre-cured in an oven at 80℃ for 30min, and then the surface is micro-etched with a fiber laser with a wavelength of 1064nm to etch a diamond grid texture with a depth of 6.5μm and a spacing of 25μm. Finally, it is completely cured at 120℃ for 2h to form an anti-slip coating with both macro-texture and micro-rough structure.

[0023] Example 2 S1. Three parts of hydroxylated graphene were added to N,N-dimethylformamide and ultrasonically dispersed at 300 W for 30 min to form a graphene dispersion with a concentration of 0.5%. Simultaneously, eight parts of mesoporous silica microspheres were soaked in three parts of a 5% (w / w) fluoroalkylsilane ethanol solution for 120 min and then dried at 60 °C to complete the surface hydrophobic modification. Then, the graphene dispersion and the modified silica microspheres were mixed and stirred at 3000 r / min for 30 min to form a functional modified phase. S2. Under nitrogen protection, 60 parts of hydroxyl-terminated polyurethane prepolymer were heated to 65°C, and 15 parts of isophorone diisocyanate were slowly added and stirred for 1.5 hours to form -NCO-terminated prepolymer. Then the temperature was lowered to 40°C, half of the functional modified phase was added and stirred, followed by 30 parts of modified graphene oxide and stirred until homogeneous. Then the remaining half of the functional modified phase was added and stirred for 10-15 minutes. After stirring, 1 part of phosphate ester antioxidant, 0.3 parts of benzotriazole UV absorber, 2 parts of carbon black and 3 parts of fumed silica were added and stirred at 2000 r / min for 45 minutes. Finally, 0.1 parts of dibutyltin dilaurate were added and stirred at 500 r / min for 10 minutes and degassed for 30 minutes to obtain the coating slurry. S3. The ship deck substrate is subjected to sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment in sequence. Then, the coating slurry is applied by scraping, and the wet film thickness is controlled at 175μm. It is first pre-cured in an oven at 80℃ for 30min, and then the surface is micro-etched with a fiber laser with a wavelength of 1064nm to etch a diamond grid texture with a depth of 6.5μm and a spacing of 25μm. Finally, it is completely cured at 120℃ for 2h to form an anti-slip coating with both macro-texture and micro-rough structure.

[0024] The difference between Example 2 and Example 1 is that the proportions of all raw materials have changed, but both are within the scope of protection of this invention.

[0025] Example 3 S1. Add 1.5 parts of hydroxylated graphene to N,N-dimethylformamide and disperse it ultrasonically at 300 W for 30 min to form a graphene dispersion with a concentration of 0.5%; at the same time, soak 12 parts of mesoporous silica microspheres in 2 parts of 5% (w / w) fluoroalkylsilane ethanol solution for 120 min and then dry them at 60℃ to complete the surface hydrophobic modification; then mix the graphene dispersion with the modified silica microspheres and stir at 3000 r / min for 30 min to form a functional modified phase; S2. Under nitrogen protection, 70 parts of hydroxyl-terminated polyurethane prepolymer were heated to 65°C, and 12 parts of isophorone diisocyanate were slowly added and stirred for 1.5 hours to form -NCO-terminated prepolymer. Then the temperature was lowered to 40°C, half of the functional modified phase was added and stirred, followed by 20 parts of modified graphene oxide and stirred until homogeneous. Then the remaining half of the functional modified phase was added and stirred for 10-15 minutes. Then 0.5 parts of phosphate ester antioxidant, 0.5 parts of benzotriazole UV absorber, 1 part of carbon black and 5 parts of fumed silica were added and stirred at 2000 r / min for 45 minutes. Finally, 0.3 parts of dibutyltin dilaurate were added and stirred at 500 r / min for 10 minutes, followed by degassing for 30 minutes to obtain the coating slurry. S3. The ship deck substrate is subjected to sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment in sequence. Then, the coating slurry is applied by scraping, and the wet film thickness is controlled at 175μm. It is first pre-cured in an oven at 80℃ for 30min, and then the surface is micro-etched with a fiber laser with a wavelength of 1064nm to etch a diamond grid texture with a depth of 6.5μm and a spacing of 25μm. Finally, it is completely cured at 120℃ for 2h to form an anti-slip coating with both macro-texture and micro-rough structure.

[0026] The difference between Example 3 and Example 1 is that the proportions of all raw materials have changed, but both are within the scope of protection of this invention.

[0027] To demonstrate the superiority of the present invention, comparative examples 1-3 are provided herein.

[0028] Comparative Example 1 S1. Five parts of hydroxylated graphene were added to N,N-dimethylformamide and ultrasonically dispersed at 300 W for 30 min to form a graphene dispersion with a concentration of 0.5%. Simultaneously, five parts of mesoporous silica microspheres were soaked in a 5% (w / w) fluoroalkylsilane ethanol solution for 120 min and then dried at 60 °C to complete the surface hydrophobic modification. Then, the graphene dispersion and the modified silica microspheres were mixed and stirred at 3000 r / min for 30 min to form the modified phase. S2. Under nitrogen protection, 80 parts of hydroxyl-terminated polyurethane prepolymer were heated to 65°C, and 5 parts of isophorone diisocyanate were slowly added and stirred for 1.5 hours to form a prepolymer. Then the temperature was lowered to 40°C, 1 / 2 of the functional modified phase was added and stirred, followed by 15 parts of modified graphene oxide and stirred until homogeneous. Then the remaining 1 / 2 of the modified phase was added and stirred for 10 minutes. After stirring, 1.5 parts of phosphate ester antioxidant, 1 part of benzotriazole UV absorber, 0.5 parts of carbon black and 2 parts of fumed silica were added and stirred at 2000 r / min for 45 minutes. Finally, 0.5 parts of dibutyltin dilaurate were added and stirred at 500 r / min for 10 minutes, followed by degassing for 30 minutes to obtain the slurry. S3. The ship deck substrate is subjected to sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment in sequence. Then, the coating slurry is applied by scraping, and the wet film thickness is controlled at 150-200μm. It is first pre-cured in an oven at 80℃ for 30min, and then the surface is micro-etched with a fiber laser with a wavelength of 1064nm to etch a diamond grid texture with a depth of 6μm and a spacing of 25μm. Finally, it is completely cured at 120℃ for 2h to form a coating.

[0029] The difference between Comparative Example 1 and Example 1 is that the proportion of raw materials is not within the scope of protection of this invention. The resulting material has poor anti-slip performance. Excessive amounts of certain raw materials may lead to insufficient reaction of the raw material components, resulting in insufficient fineness and flowability.

[0030] Comparative Example 2 S1. Mix 2.2 parts of hydroxylated graphene, N,N-dimethylformamide, 10 parts of mesoporous silica microspheres, 2.5 parts of 5% (w / w) fluoroalkylsilane ethanol solution, 65 parts of hydroxyl-terminated polyurethane prepolymer, 13.5 parts of isophorone diisocyanate, 25 parts of modified graphene oxide, 0.75 parts of phosphate ester antioxidant, 0.4 parts of benzotriazole UV absorber, 1.5 parts of carbon black, 4 parts of fumed silica, and 0.2 parts of dibutyltin dilaurate, and stir at 2000 r / min for 45 min to obtain a slurry. S2. The ship deck substrate is subjected to sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment in sequence. Then, the slurry is applied by scraping, and the wet film thickness is controlled at 175μm. It is first pre-cured in an oven at 80℃ for 30min, and then the surface is micro-etched with a fiber laser with a wavelength of 1064nm to etch a diamond grid texture with a depth of 6.5μm and a spacing of 25μm. Finally, it is completely cured at 120℃ for 2h to form a coating.

[0031] The difference between Comparative Example 2 and Example 1 is that the anti-slip coating was not prepared using the preparation method of the present invention. All raw materials were directly mixed together, and each raw material did not have sufficient reaction time to be fully reacted. As a result, the anti-slip performance and strength of the material were insufficient, and it was prone to cracking and developing gaps.

[0032] Comparative Example 3 S1. Soak 10 parts of mesoporous silica microspheres in 2.5 parts of 5% (w / w) fluoroalkylsilane ethanol solution for 120 min, and then dry them at 60℃ to complete the surface hydrophobic modification. S2. Under nitrogen protection, 65 parts of hydroxyl-terminated polyurethane prepolymer were heated to 60-70℃ and then cooled to 40℃. Modified mesoporous silica microspheres were added and stirred for 10-15 min. Then, 0.75 parts of phosphate ester antioxidant, 0.4 parts of benzotriazole UV absorber, 1.5 parts of carbon black and 4 parts of fumed silica were added. The mixture was stirred at 2000 r / min for 45 min. Finally, 0.2 parts of dibutyltin dilaurate were added and the mixture was stirred at 500 r / min for 10 min. The mixture was then degassed for 30 min to obtain the slurry. S3. The ship deck substrate is subjected to sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment in sequence. Then, the slurry is applied by scraping, and the wet film thickness is controlled at 150-200μm. It is first pre-cured in an oven at 80℃ for 30min, and then the surface is micro-etched with a fiber laser with a wavelength of 1064nm to etch a diamond grid texture with a depth of 5-8μm and a spacing of 20-30μm. Finally, it is completely cured at 120℃ for 2h to form a coating.

[0033] The difference between Comparative Example 3 and Example 1 is that the latter did not use modified graphene oxide, hydroxylated graphene, isophorone diisocyanate, etc., and lacked reaction materials, resulting in insufficient anti-slip performance of the obtained material.

[0034] 1. The anti-slip coatings prepared in Examples 1-3 of this invention have excellent anti-slip properties: After immersion in simulated seawater with a 3.5% NaCl solution, the anti-slip coating exhibits a static friction coefficient >0.85 and a dynamic friction coefficient >0.7, which is significantly higher than the standard of ≥0.6 for marine deck coatings in GB / T 10827-2014 "Safety Requirements and Verification of Motor Industrial Vehicles".

[0035] 2. The anti-slip coatings prepared in Examples 1-3 of this invention have excellent durability: After 2400 hours of immersion in a 3.5% NaCl solution simulating seawater immersion, the anti-slip coating remained free of blistering and peeling, with adhesion (cross-cut test) maintaining grade 0. After 1000 revolutions in a Taber abrasion test (CS-10 grinding wheel, 1000g load), the wear amount was <5mg. After 1000 hours of xenon lamp aging test, the color difference ΔE was <1.5, and the gloss retention rate was >80%.

[0036] After testing Comparative Examples 1-3, these coatings all exhibited peeling, cracking, thinning, and wear after immersion in simulated seawater environments, showing severe aging and proving unsuitable for marine ship environments.

[0037] The anti-slip coating of this invention differs from existing single-particle filling or single-texture designs. It is the first to use a multi-level structure design of "nanofiller + laser micro-engraving" and introduces graphene to achieve multiple functions such as anti-slip, wear resistance and anti-aging, breaking through the limitation of the single function of traditional coatings. The fluorosilicone synergistic modification solves the problems of seawater adhesion and biofouling, eliminating the need for additional antifouling coatings.

[0038] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. An anti-slip coating for ship decks, characterized in that: The coating is composed of a base resin, a functional modified phase, a crosslinking curing system, and auxiliary additives; The matrix resin consists of 60-70 parts of hydroxyl-terminated polyurethane prepolymer and 20-30 parts of modified graphene oxide. The functional modified phase consists of 1.5-3 parts hydroxylated graphene, 8-12 parts mesoporous silica microspheres, and 2-3 parts fluoroalkylsilane. The cross-linking curing system consists of 12-15 parts isophorone diisocyanate and 0.1-0.3 parts dibutyltin dilaurate; The auxiliary agent consists of 0.5-1 parts of phosphate ester antioxidant, 0.3-0.5 parts of benzotriazole ultraviolet absorber, 1-2 parts of carbon black, and 3-5 parts of fumed silica.

2. The anti-slip coating for ship decks according to claim 1, characterized in that: The molecular weight of the hydroxyl-terminated polyurethane prepolymer is 3000-5000, and polybutylene adipate type soft segments are selected to improve low-temperature flexibility and seawater immersion resistance; the modified graphene oxide is modified by reacting amino silane coupling agent with GO to introduce amino functional groups on the GO surface.

3. The anti-slip coating for ship decks according to claim 2, characterized in that: The hydroxylated graphene has a sheet thickness of 1-5 nm and a lateral dimension of 5-10 μm; the mesoporous silica microspheres have a pore size of 2-5 nm and a particle size of 5-15 μm; the fluoroalkylsilane is tridecafluorooctyltriethoxysilane.

4. The anti-slip coating for ship decks according to claim 3, characterized in that: The carbon black has a particle size of 20-30 nm.

5. A method for preparing an anti-slip coating for ship decks, comprising the anti-slip coating for ship decks as described in any one of claims 1-4, characterized in that: Includes the following steps, S1. Hydroxylated graphene is added to N,N-dimethylformamide and dispersed by ultrasonication to form a graphene dispersion with a concentration of 0.5%; at the same time, mesoporous silica microspheres are soaked in a 5% (w / w) fluoroalkylsilane ethanol solution and then dried to complete the surface hydrophobic modification; then the graphene dispersion is mixed with the modified silica microspheres and stirred at high speed to form a functional modified phase; S2. Under nitrogen protection, the hydroxyl-terminated polyurethane prepolymer is heated to 60-70℃, and isophorone diisocyanate is slowly added and stirred for 1.5h to form -NCO-terminated prepolymer. Then, the temperature is lowered to 40℃, half of the functional modified phase is added and stirred, followed by the addition of modified graphene oxide and stirring. Then, the remaining half of the functional modified phase is added and stirred for 10-15min. Phosphate ester antioxidant, benzotriazole UV absorber, carbon black and fumed silica are added and stirred at high speed. Finally, dibutyltin dilaurate is added and stirred at a reduced speed, and degassing is performed for 30min to obtain the coating slurry. S3. After pre-treating the ship deck substrate, apply the coating slurry using a scraping method, controlling the wet film thickness to 150-200μm. First, pre-cur it in an 80℃ oven for 30 minutes, then use a 1064nm fiber laser to perform surface micro-etching, etching out a diamond-shaped grid texture with a depth of 5-8μm and a spacing of 20-30μm. Finally, fully cure it at 120℃ for 2 hours to form an anti-slip coating that combines macroscopic texture and microscopic rough structure.

6. The method for preparing an anti-slip coating for ship decks according to claim 5, characterized in that: The pretreatment method for the ship deck substrate is to sequentially perform sandblasting to remove rust, pickling to remove oil, and silane coupling agent treatment on the ship deck substrate.

7. The method for preparing an anti-slip coating for ship decks according to claim 5, characterized in that: In step S1, after the hydroxylated graphene is added to N,N-dimethylformamide, it is ultrasonically dispersed at a power of 300W for 30 minutes; the mesoporous silica microspheres are soaked in a fluoroalkylsilane ethanol solution for 100-140 minutes and dried at a temperature of 55-65℃.

8. The method for preparing an anti-slip coating for ship decks according to claim 7, characterized in that: In step S1, the graphene dispersion and the modified silica microspheres are mixed and stirred at 3000 r / min for 30 min.

9. The method for preparing an anti-slip coating for ship decks according to claim 5, characterized in that: In step S2, the high-speed stirring condition is to stir at 2000 r / min for 45 min; the low-speed stirring condition is to stir at 500 r / min for 10 min.

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