A kind of buoy surface crash-resistant anticorrosion coating material and buoy device

Abstract

This invention relates to a shock-resistant and corrosion-resistant coating material for buoy surfaces and a buoy device, belonging to the field of polyurethane coating technology. The invention prepares a polyurethane anti-corrosion chain extender containing both trifluoromethyl and thiazole ring structures, with the reactive groups being amino and hydroxyl, respectively. This chain extender can utilize the difference in reactivity with isocyanate groups to regulate the degree of microphase separation in the polyurethane coating material, thereby improving the impact resistance of the coating material and enabling the buoy surface coating material to more effectively resist the impact of ocean waves.

Description

Technical Field

[0001] This invention belongs to the field of polyurethane coating technology, specifically relating to a buoy surface impact-resistant and corrosion-resistant coating material and a buoy device. Background Technology

[0002] Ocean buoys serve as crucial platforms for marine environmental monitoring, navigation, communication, and hydro-meteorological observation, operating long-term in harsh marine environments. These buoys must withstand the continuous impact of waves and ultraviolet radiation, as well as the long-term corrosion from seawater, salt spray, and marine microorganisms. Therefore, the performance of their surface protective coating directly determines the buoy's service life and reliability.

[0003] The protective effect of a protective coating depends on both its hydrophobic properties and its adhesion to the buoy surface. If the coating is not sufficiently hydrophobic, corrosive media such as water molecules, chloride ions, and oxygen in seawater will gradually penetrate the coating under the influence of concentration gradients, reaching the metal substrate surface and triggering an electrochemical corrosion reaction. While the hydrophobic properties of the coating can be improved by adding organosilicon or fluorides, the poor compatibility of fluorosilicone additives with the protective coating itself often comes at the cost of reduced adhesion. This makes the coating more susceptible to peeling off under seawater penetration and wave impact, completely losing its protective effect on the buoy.

[0004] To address the above-mentioned technical deficiencies, this invention provides a buoy surface impact-resistant and corrosion-resistant coating material and a buoy device. Summary of the Invention

[0005] The purpose of this invention is to provide a buoy surface impact-resistant and corrosion-resistant coating material and a buoy device to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A buoy surface impact-resistant and corrosion-resistant coating material comprises the following raw materials in parts by weight: 55-65 parts polyester polyol, 35-45 parts polyisocyanate, 0.01-0.1 parts catalyst, 6-12 parts corrosion inhibitor chain extender, 1-3 parts ultraviolet absorber, 5-20 parts pigment, 1-5 parts functional additives, and 20-30 parts diluent;

[0008] Furthermore, the polyester polyol is at least one of polycaprolactone diol, polycarbonate diol, and polyadipate diol.

[0009] Furthermore, the number-average molecular weight of the polyester polyol is 1000 to 3000.

[0010] Furthermore, the polyisocyanate is at least one of isophorone diisocyanate and hexamethylene diisocyanate.

[0011] Furthermore, the catalyst is an organotin catalyst.

[0012] Furthermore, the ultraviolet absorber is at least one of UV-326 and UV-327.

[0013] Furthermore, the pigment is at least one of titanium dioxide, zinc dioxide, iron oxide red, iron oxide yellow, and iron oxide green.

[0014] Furthermore, the functional additive is at least one of defoamer, leveling agent, dispersant, and thixotropic agent.

[0015] Furthermore, the diluent is at least one of propylene glycol methyl ether acetate, cyclohexanone, and butanone.

[0016] Furthermore, the corrosion inhibitor and chain extender can be prepared by the following steps:

[0017] S1. 3-Bromopyruvic acid is reacted with thiourea in a Hantzsch thiazole synthesis reaction to obtain a chain extender precursor.

[0018] The reaction process is as follows: 9-18 parts by mass of 3-bromopyruvic acid, 5-10 parts by mass of thiourea, and 42-84 parts by mass of N,N-dimethylformamide are mixed and reacted at 80-90℃ for 2-4 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. After filtering to separate the precipitate, the precipitate is washed with deionized water and dried to obtain the chain extender precursor.

[0019]

[0020] S2. The chain extender precursor is esterified with 2-(trifluoromethyl)propanediol to obtain the corrosion-preservative chain extender;

[0021] The reaction process is as follows: 5-10 parts by mass of chain extender precursor, 8-16 parts by mass of 2-(trifluoromethyl)propanediol, 2.4-4.8 parts by mass of p-toluenesulfonic acid, and 60-120 parts by mass of N,N-dimethylformamide are mixed and reacted at 100-120℃ for 4-10 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration and then eluted by silica gel column chromatography to obtain the anti-corrosion chain extender.

[0022]

[0023] Furthermore, the impact-resistant and corrosion-resistant coating material on the buoy surface can be prepared by the following steps:

[0024] Step 1: Polyester polyol, polyisocyanate, and catalyst are mixed and reacted at 80-100℃ for 1.5-4 hours to obtain polyurethane prepolymer. Then, anti-corrosion chain extender and diluent are added to the system, and the system temperature is lowered to 45-55℃. The system is then reacted at 45-55℃ for 2-3 hours. After the reaction is completed, ultraviolet absorber, pigment, and functional additives are added to the system. After stirring and mixing evenly, degassing treatment is performed to obtain impact-resistant and anti-corrosion coating for buoy surface.

[0025] The second step is to apply an impact-resistant and corrosion-resistant coating to the surface of the buoy, then bake it at a temperature of 65-85℃ for 1-2 hours, and then cure it at room temperature for 7 days to obtain the impact-resistant and corrosion-resistant coating material for the buoy surface.

[0026] A buoy device, wherein the buoy device is coated with an impact-resistant and corrosion-resistant coating material on the surface of the buoy using an immersion coating process.

[0027] In summary, the present invention has at least the following beneficial effects:

[0028] 1) This invention prepares a corrosion-resistant chain extender for polyurethane coatings. The reactive groups in this chain extender are amino and hydroxyl groups. The amino and hydroxyl groups exhibit significant differences in activity when reacting with isocyanate groups, and this difference regulates the polymerization process of polyurethane. During polymerization, the highly reactive amino groups preferentially react with the isocyanate groups to form harder segments with more regular structures and more concentrated lengths. The less reactive hydroxyl groups react later, forming crosslinking sites between the hard segments. This "stepwise" polymerization method allows the hard segments in the polyurethane to be more concentrated, significantly improving the degree of microphase separation within the polyurethane, enhancing the impact resistance of the coating material, and enabling the coating material on the buoy surface to more effectively resist the impact of sea waves.

[0029] 2) The corrosion-resistant chain extender prepared in this invention also contains a thiazole ring structure and a trifluoromethyl structure. Introducing the thiazole ring structure into the polyurethane coating using this corrosion-resistant chain extender can improve the cohesive strength of the coating material. When the coating material adheres to the surface of a metal buoy, the sulfur and nitrogen atoms on the thiazole ring can form coordinate bonds with the empty orbitals in the metal atoms on the buoy surface, generating a strong chemical adsorption effect, effectively improving the adhesion of the coating material of this invention to the buoy surface. Furthermore, the corrosion-resistant chain extender of this invention can also introduce a strongly hydrophobic trifluoromethyl group into the coating material. The hydrophobic trifluoromethyl group tends to accumulate on the coating surface, forming a "hydrophobic barrier." This not only improves the hydrophobic properties of the coating, effectively blocking the penetration of water molecules and corrosive media in seawater, but also further increases the degree of microphase separation in the polyurethane coating, improves the impact resistance of the coating, and extends the service life of the coating material on the buoy surface. Attached Figure Description

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the buoy device structure of the present invention. Figure 1 ;

[0032] Figure 2 This is a schematic diagram of the buoy device structure of the present invention. Figure 2 .

[0033] In the diagram: 1. Mast frame; 2. Buoyancy chamber; 3. Collision guard; 4. Mooring ring; 5. Indicator light; 6. Stabilizer; 7. Counterweight. Detailed Implementation

[0034] This invention provides a buoy surface impact-resistant and corrosion-resistant coating material and a buoy device. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0035] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0036] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0037] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0038] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0039] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0040] The use of any and all instances or exemplary language such as “e.g.” or “including” in this document is merely intended to better illustrate the invention and is not intended to limit the scope of the invention unless the claims are made. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of the invention.

[0041] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0042] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0043] The embodiments and comparative examples of this invention describe some examples, in which the embodiments illustrate certain implementations of the invention. However, this does not mean that the effects of the invention can only be achieved in these examples.

[0044] To further illustrate the present invention, the following describes in detail, with reference to embodiments, a buoy surface impact-resistant and corrosion-resistant coating material and a buoy device provided by the present invention.

[0045] Example 1

[0046] A buoy surface impact-resistant and corrosion-resistant coating material comprises the following raw materials in parts by weight: 55 parts polyester polyol, 45 parts isophorone diisocyanate, 0.01 parts dibutyltin dilaurate, 6 parts corrosion inhibitor chain extender, 1 part ultraviolet absorber, 5 parts pigment, 1 part functional additive, and 20 parts propylene glycol methyl ether acetate.

[0047] In this embodiment, the polyester polyol used is polycaprolactone diol, and the number average molecular weight of the polyester polyol is 1000. The ultraviolet absorber is ultraviolet absorber UV-326. The pigment is a mixture of 0.75 parts by weight of iron oxide red and 4.25 parts by weight of titanium dioxide. The functional additives are a mixture of 0.1 parts by weight of BASF EFKA SI 2722 defoamer, 0.15 parts by weight of BASF EFKA FL 3777 leveling agent, 0.5 parts by weight of BASF Efka PU 4063 dispersant, and 0.25 parts by weight of Sago-8105 thixotropic agent. The corrosion inhibitor and chain extender are prepared by the following steps:

[0048] S1. By mass fraction, 9 parts of 3-bromopyruvic acid, 5 parts of thiourea, and 42 parts of N,N-dimethylformamide were mixed and reacted at 80°C for 4 hours. After the reaction was completed, the reaction solution was poured into petroleum ether to precipitate. After filtering and separating the precipitate, the precipitate was washed with deionized water and dried to obtain the chain extender precursor.

[0049] S2. By mass, 5 parts of chain extender precursor, 8 parts of 2-(trifluoromethyl)propanediol, 2.4 parts of p-toluenesulfonic acid, and 60 parts of N,N-dimethylformamide are mixed and reacted at 100℃ for 10 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration and then eluted by silica gel column chromatography to obtain the anti-corrosion chain extender.

[0050] The impact-resistant and corrosion-resistant coating material on the buoy surface in this embodiment is prepared by the following steps:

[0051] Step 1: Polyester polyol, isophorone diisocyanate, and dibutyltin dilaurate are mixed and reacted at 80°C for 4 hours to obtain polyurethane prepolymer. Then, corrosion inhibitors and chain extenders and propylene glycol methyl ether acetate are added to the system, and the system temperature is lowered to 45°C. The system is then reacted at 45°C for 3 hours. After the reaction is completed, ultraviolet absorbers, pigments, and functional additives are added to the system. After stirring and mixing evenly, degassing treatment is performed to obtain a collision-resistant and corrosion-resistant coating for the buoy surface.

[0052] The second step is to apply an impact-resistant and corrosion-resistant coating to the surface of the buoy, then bake it at 65°C for 2 hours, and then cure it at room temperature for 7 days to obtain the impact-resistant and corrosion-resistant coating material for the buoy surface.

[0053] Example 2

[0054] A buoy surface impact-resistant and corrosion-resistant coating material comprises the following raw materials in parts by weight: 60 parts polyester polyol, 40 parts hexamethylene diisocyanate, 0.055 parts dibutyltin dilaurate, 9 parts corrosion inhibitor chain extender, 2 parts ultraviolet absorber, 12.5 parts pigment, 2.75 parts functional additives, and 25 parts cyclohexanone.

[0055] In this embodiment, the polyester polyol used is polycarbonate diol, and the number average molecular weight of the polyester polyol is 2000. The ultraviolet absorber is ultraviolet absorber UV-327. The pigment is a mixture of 2.5 parts by weight of iron oxide yellow and 10 parts by weight of zinc white powder. The functional additives are a mixture of 0.3 parts by weight of BASF EFKA SI 2038 defoamer, 0.45 parts by weight of BASF EFKA FL 3777 leveling agent, 1.25 parts by weight of BASF Efka PU 4010 dispersant, and 0.75 parts by weight of Sago-8105 thixotropic agent. The corrosion inhibitor and chain extender are prepared by the following steps:

[0056] S1. By mass, 13.5 parts of 3-bromopyruvic acid, 7.5 parts of thiourea, and 63 parts of N,N-dimethylformamide were mixed and reacted at 85°C for 3 hours. After the reaction was completed, the reaction solution was poured into petroleum ether to precipitate. After filtering and separating the precipitate, the precipitate was washed with deionized water and dried to obtain the chain extender precursor.

[0057] S2. By mass, 7.5 parts of chain extender precursor, 12 parts of 2-(trifluoromethyl)propanediol, 3.6 parts of p-toluenesulfonic acid, and 90 parts of N,N-dimethylformamide are mixed and reacted at 110℃ for 7 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration and then eluted by silica gel column chromatography to obtain the anti-corrosion chain extender.

[0058] The impact-resistant and corrosion-resistant coating material on the buoy surface in this embodiment is prepared by the following steps:

[0059] Step 1: Polyester polyol, hexamethylene diisocyanate, and dibutyltin dilaurate are mixed and reacted at 90℃ for 2.75h ​​to obtain polyurethane prepolymer. Then, corrosion inhibitors and chain extenders and cyclohexanone are added to the system, and the system temperature is lowered to 50℃. The system is then reacted at 50℃ for 2.5h. After the reaction is completed, ultraviolet absorbers, pigments, and functional additives are added to the system. After stirring and mixing evenly, degassing treatment is performed to obtain a collision-resistant and corrosion-resistant coating for the buoy surface.

[0060] The second step is to apply an impact-resistant and corrosion-resistant coating to the surface of the buoy, then bake it at 75°C for 1.5 hours, and then cure it at room temperature for 7 days to obtain the impact-resistant and corrosion-resistant coating material for the buoy surface.

[0061] Example 3

[0062] A buoy surface impact-resistant and corrosion-resistant coating material comprises the following raw materials in parts by weight: 65 parts polyester polyol, 35 parts isophorone diisocyanate, 0.1 parts stannous octoate, 12 parts corrosion inhibitor chain extender, 3 parts ultraviolet absorber, 20 parts pigment, 5 parts functional additives, and 30 parts methyl ethyl ketone.

[0063] In this embodiment, the polyester polyol used is polyadipate diol, and the number average molecular weight of the polyester polyol is 3000. The ultraviolet absorber is ultraviolet absorber UV-327. The pigment is a mixture of 2.5 parts by weight of iron oxide green and 17.5 parts by weight of titanium dioxide. The functional additives are a mixture of 0.6 parts by weight of BASF EFKA SI 2038 defoamer, 0.9 parts by weight of BASF EFKA FL 3670 leveling agent, 2 parts by weight of BASF Efka PU 4063 dispersant, and 1.5 parts by weight of Sago-8105 thixotropic agent. The corrosion inhibitor and chain extender are prepared by the following steps:

[0064] S1. By mass, 18 parts of 3-bromopyruvic acid, 10 parts of thiourea, and 84 parts of N,N-dimethylformamide were mixed and reacted at 90°C for 2 hours. After the reaction was completed, the reaction solution was poured into petroleum ether to precipitate. After filtering and separating the precipitate, the precipitate was washed with deionized water and dried to obtain the chain extender precursor.

[0065] S2. By mass, 10 parts of chain extender precursor, 16 parts of 2-(trifluoromethyl)propanediol, 4.8 parts of p-toluenesulfonic acid, and 120 parts of N,N-dimethylformamide are mixed and reacted at 120℃ for 4 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration and then eluted by silica gel column chromatography to obtain the anti-corrosion chain extender.

[0066] The impact-resistant and corrosion-resistant coating material on the buoy surface in this embodiment is prepared by the following steps:

[0067] Step 1: Polyester polyol, isophorone diisocyanate, and stannous octoate are mixed and reacted at 100℃ for 1.5h to obtain polyurethane prepolymer. Then, anti-corrosion chain extender and methyl ethyl ketone are added to the system, and the system temperature is reduced to 55℃. The system is then reacted at 55℃ for 2h. After the reaction is completed, ultraviolet absorber, pigment, and functional additives are added to the system. After stirring and mixing evenly, degassing treatment is performed to obtain impact-resistant and anti-corrosion coating for buoy surface.

[0068] The second step is to apply an impact-resistant and corrosion-resistant coating to the surface of the buoy, then bake it at 85°C for 1 hour, and then cure it at room temperature for 7 days to obtain the impact-resistant and corrosion-resistant coating material for the buoy surface.

[0069] Example 4

[0070] Based on the above embodiments, referring to Figures 1-2 As shown, this embodiment provides a buoy device. The buoy device is coated with the above-mentioned impact-resistant and corrosion-resistant coating material on the buoy surface using an immersion coating process. The buoy device includes a buoyancy chamber 2, which is used to provide buoyancy for the entire buoy device. A mast frame 1 is provided above the buoyancy chamber 2. An indicator light 5 is provided at the upper end of the mast frame 1. A stabilizing column 6 is provided below the buoyancy chamber 2. A counterweight 7 is provided at the lower end of the stabilizing column 6.

[0071] The upper and lower ends of the buoyancy chamber 2 are symmetrically equipped with mooring rings 4 for the deployment, retrieval, or mooring of the buoy device. In addition, the buoyancy chamber 2 is equipped with several anti-collision fenders 3 at equal intervals on its exterior. The anti-collision fenders 3 are made of circular steel pipes and welded with triangular reinforcing plates on both sides to prevent deformation of the anti-collision fenders 3. The entire device is coated with an anti-collision and anti-corrosion coating material using an immersion coating process to prevent corrosion of the device during long-term operation in water, and to prevent localized corrosion caused by surface damage after a collision of the buoy device.

[0072] Comparative Example 1

[0073] The difference between this comparative example and Example 1 is that, instead of preparing a corrosion-preserving chain extender, an equal mass of 2-(trifluoromethyl)propanediol is used.

[0074] A buoy surface impact-resistant and corrosion-resistant coating material comprises the following raw materials in parts by weight: 55 parts polyester polyol, 45 parts isophorone diisocyanate, 0.01 parts dibutyltin dilaurate, 6 parts 2-(trifluoromethyl)propylene glycol, 1 part ultraviolet absorber, 5 parts pigment, 1 part functional additive, and 20 parts propylene glycol methyl ether acetate.

[0075] In this embodiment, the polyester polyol used is polycaprolactone diol, and the number average molecular weight of the polyester polyol is 1000. The ultraviolet absorber is ultraviolet absorber UV-326. The pigment is a mixture of 0.75 parts by weight of iron oxide red and 4.25 parts by weight of titanium dioxide. The functional additives are a mixture of 0.1 parts by weight of BASF EFKA SI 2722 defoamer, 0.15 parts by weight of BASF EFKA FL 3777 leveling agent, 0.5 parts by weight of BASF Efka PU 4063 dispersant, and 0.25 parts by weight of Sago-8105 thixotropic agent.

[0076] The impact-resistant and corrosion-resistant coating material on the buoy surface in this embodiment is prepared by the following steps:

[0077] Step 1: Polyester polyol, isophorone diisocyanate, and dibutyltin dilaurate are mixed and reacted at 80℃ for 4 hours to obtain a polyurethane prepolymer. Then, 2-(trifluoromethyl)propanediol and propylene glycol methyl ether acetate are added to the system, and the system temperature is lowered to 45℃. The system is then reacted at 45℃ for 3 hours. After the reaction is completed, ultraviolet absorbers, pigments, and functional additives are added to the system. After stirring and mixing evenly, the system is degassed to obtain a collision-resistant and corrosion-resistant coating for the buoy surface.

[0078] The second step is to apply an impact-resistant and corrosion-resistant coating to the surface of the buoy, then bake it at 65°C for 2 hours, and then cure it at room temperature for 7 days to obtain the impact-resistant and corrosion-resistant coating material for the buoy surface.

[0079] Experimental Example

[0080] The coating materials in Examples 1-3 and Comparative Example 1 were subjected to performance tests. The adhesion of each component sample to the buoy surface was tested according to GB / T 5210 "Paints and Varnishes - Pull-off Adhesion Test". The impact strength of each component sample was tested according to GB / T 1732 "Paint Film Impact Resistance Test". The abrasion resistance of each component sample was tested according to GB / T 1768 "Determination of Abrasion Resistance of Paints and Varnishes - Rotating Rubber Grinding Wheel Method" (with a load of 1 kg). The salt spray resistance was tested according to GB / T 1771 "Determination of Neutral Salt Spray Resistance of Paints and Varnishes" (with a 5% sodium chloride solution as the test solution, a test temperature of 35±2℃, and a test time of 1000 h). The test results are shown in Table 1.

[0081] Table 1

[0082] project Example 1 Example 2 Example 3 Comparative Example 1 Adhesion (MPa) 8.6 9.2 8.4 3.4 Impact strength (cm) 55 60 58 44 Salt spray resistance The coating is intact and free of rust. The coating is intact and free of rust. The coating is intact and free of rust. Coating bubbles, slight corrosion Wear mass (mg / 1000r) 18 15 17 34

[0083] As can be seen from Table 1, the coating materials using the anti-corrosion chain extender of the present invention in Examples 1-3 have better overall performance. Although the chain extender used in Comparative Example 1 also contains trifluoromethyl groups in its structure, the trifluoromethyl groups have poor bonding ability with the metal substrate. It lacks groups that can interact with the metal substrate, which leads to a serious decrease in the bonding ability between the coating material and the metal substrate. It also affects the density of the coating material on the surface of the metal substrate. Therefore, although the coating material in Comparative Example 1 has more hydrophobic groups in its structure, the salt spray resistance of the coating material in Comparative Example 1 is actually poor.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A shock-resistant and corrosion-resistant coating material for buoy surfaces, characterized in that, The raw materials contain the following parts by weight: 55-65 parts polyester polyol, 35-45 parts polyisocyanate, 0.01-0.1 parts catalyst, 6-12 parts corrosion inhibitor and chain extender, 1-3 parts ultraviolet absorber, 5-20 parts pigment, 1-5 parts functional additives, and 20-30 parts diluent. The corrosion-resistant chain extender is prepared by the following steps: S1. 3-Bromopyruvic acid is reacted with thiourea in a Hantzsch thiazole synthesis reaction to obtain a chain extender precursor. S2. The chain extender precursor is esterified with 2-(trifluoromethyl)propanediol to obtain the anti-corrosion chain extender.

2. The impact-resistant and corrosion-resistant coating material for buoy surfaces according to claim 1, characterized in that, The corrosion-resistant chain extender is prepared by the following steps: S1. By mass, 9-18 parts of 3-bromopyruvic acid, 5-10 parts of thiourea, and 42-84 parts of N,N-dimethylformamide are mixed and subjected to a temperature of 80-90°C to obtain a chain extender precursor. S2. By mass, 5-10 parts of chain extender precursor, 8-16 parts of 2-(trifluoromethyl)propanediol, 2.4-4.8 parts of p-toluenesulfonic acid, and 60-120 parts of N,N-dimethylformamide are mixed and reacted at a temperature of 100-120℃ to obtain the corrosion-resistant chain extender.

3. The impact-resistant and corrosion-resistant coating material for buoy surfaces according to claim 1, characterized in that, The polyester polyol is at least one of polycaprolactone diol, polycarbonate diol, and polyadipate diol, and the number average molecular weight of the polyester polyol is 1000 to 3000.

4. The impact-resistant and corrosion-resistant coating material for buoy surfaces according to claim 1, characterized in that, The polyisocyanate is at least one of isophorone diisocyanate and hexamethylene diisocyanate.

5. The impact-resistant and corrosion-resistant coating material for buoy surfaces according to claim 1, characterized in that, The catalyst is an organotin catalyst, and the ultraviolet absorber is at least one of UV-326 and UV-327.

6. The impact-resistant and corrosion-resistant coating material for buoy surfaces according to claim 1, characterized in that, The pigment is at least one of titanium dioxide, zinc dioxide, iron oxide red, iron oxide yellow, and iron oxide green.

7. The impact-resistant and corrosion-resistant coating material for buoy surfaces according to claim 1, characterized in that, The functional additive is at least one of defoamer, leveling agent, dispersant, and thixotropic agent.

8. The impact-resistant and corrosion-resistant coating material for a buoy surface according to claim 1, characterized in that, The diluent is at least one of propylene glycol methyl ether acetate, cyclohexanone, and butanone.

9. The impact-resistant and corrosion-resistant coating material for a buoy surface according to claim 1, characterized in that, The impact-resistant and corrosion-resistant coating material on the buoy surface is prepared by the following steps: Step 1: Polyester polyol, polyisocyanate, and catalyst are mixed and reacted at 80-100℃ for 1.5-4 hours to obtain polyurethane prepolymer. Then, anti-corrosion chain extender and diluent are added to the system, and the system temperature is lowered to 45-55℃. The system is then reacted at 45-55℃ for 2-3 hours. After the reaction is completed, ultraviolet absorber, pigment, and functional additives are added to the system. After stirring and mixing evenly, degassing treatment is performed to obtain impact-resistant and anti-corrosion coating for buoy surface. The second step is to apply an impact-resistant and corrosion-resistant coating to the surface of the buoy, then bake it at a temperature of 65-85℃ for 1-2 hours, and then cure it at room temperature for 7 days to obtain the impact-resistant and corrosion-resistant coating material for the buoy surface.

10. A buoy device, characterized in that, The buoy device is coated with the impact-resistant and corrosion-resistant coating material of any one of claims 1 to 9 using an immersion coating process.

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