A high-performance polyurethane coating and its preparation method

Abstract

This application relates to the field of coating preparation technology, specifically to a high-performance polyurethane coating and its preparation method. The preparation method of the high-performance polyurethane coating involves adding polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer to a modified polyurethane emulsion. After stirring and dispersing, deionized water is added and the mixture is stirred until homogeneous to obtain the high-performance polyurethane coating. The high-performance polyurethane coating prepared in this application exhibits excellent water resistance; after prolonged immersion, the paint film shows no blistering or peeling. It also demonstrates outstanding mechanical properties and excellent chemical corrosion resistance. Furthermore, it possesses good impact resistance.

Description

Technical Field

[0001] This application relates to the field of coating preparation technology, and more specifically, to a high-performance polyurethane coating and its preparation method. Background Technology

[0002] Polyurethane coatings, as a widely used type of coating, are widely used in construction, industrial manufacturing, transportation and other fields due to their excellent wear resistance, flexibility, adhesion and good chemical corrosion resistance.

[0003] However, traditional polyurethane coatings have some limitations. On the one hand, in high humidity or high temperature and humidity environments, water molecules easily penetrate into the coating film, reacting with incompletely cured isocyanate groups to generate carbon dioxide gas, which in turn causes bubbles. Simultaneously, moisture intrusion can damage the internal structure of the coating film, causing it to whiten and soften. This not only affects the coating's appearance but also reduces its protective performance and shortens its service life. On the other hand, facing increasingly complex application scenarios, although polyurethane coatings themselves possess a certain degree of chemical corrosion resistance, their chemical bonds are easily broken when exposed to extremely corrosive media such as strong acids, alkalis, and organic solvents. In existing technologies, adding large amounts of inorganic fillers is often used to enhance corrosion resistance, but this leads to poor coating application performance, such as reduced leveling and pinhole defects. Therefore, there is an urgent need to develop a high-performance polyurethane coating with good water resistance and chemical corrosion resistance. Summary of the Invention

[0004] To address the technical problems mentioned in the background section, this application provides a high-performance polyurethane coating and its preparation method.

[0005] In a first aspect, this application provides a high-performance polyurethane coating, which adopts the following technical solution:

[0006] A high-performance polyurethane coating comprises 30-50 parts modified polyurethane emulsion, 10-12 parts polyester resin, 5-8 parts amino resin, 18-22 parts anti-corrosion filler, 0.5-2 parts dispersant, 0.5-3 parts film-forming agent, 0.1-2 parts defoamer, 0.5-1 part drier, 0.5-1 part light stabilizer, and 10-25 parts deionized water.

[0007] Preferably, the modified polyurethane emulsion is prepared by:

[0008] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate are added to a reaction vessel and stirred at 60-70℃ for 1-2 hours. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid are slowly added, the temperature is raised to 80-90℃, and the reaction is carried out for 1-3 hours. Then, 1,4-butanediol and triglycidyl isocyanurate are added, and the reaction is carried out for 1-2 hours. The temperature is then lowered to 35-42℃, and triethylamine is added for neutralization, controlling the degree of neutralization to 60-85%. Deionized water is added, and the mixture is stirred at 1000-1500 rpm for 20-30 minutes to obtain a modified polyurethane emulsion.

[0009] Preferably, the mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, and triglycidyl isocyanate is 15-20:30-42:35-50:0.01-0.05:15-18:6-8:3-4:0.5-1.

[0010] Preferably, the preparation of the anti-corrosion filler includes the following specific steps:

[0011] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate and mercapto compound to toluene, heat to 60-80℃ under nitrogen protection, react for 4-6 hours, cool to room temperature, filter, wash and dry to obtain silane precursor;

[0012] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55-75℃, stir and react for 3-5 hours, cool to room temperature, filter, wash, and dry at 60-80℃ for 12-24 hours to obtain anti-corrosion filler.

[0013] Preferably, the mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound and toluene in step 1 is 10-12:4-5:2-4:50-70.

[0014] Preferably, in step 1, the thiol compound is composed of mercaptoethanol and allyl thiol in a mass ratio of 3-5:0.5-1.

[0015] Preferably, the mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene in step 2 is 10:2-5:5-8:50-80.

[0016] Preferably, the dispersant is sodium hexametaphosphate.

[0017] Preferably, the film-forming agent is dipropylene glycol butyl ether.

[0018] Preferably, the defoamer is an organically modified polysiloxane defoamer.

[0019] Preferably, the drying agent is an organotin drying agent.

[0020] Preferably, the light stabilizer is one or more of azine ultraviolet absorbers, hindered amine light stabilizers, and hindered phenolic light stabilizers.

[0021] Secondly, this application also provides a method for preparing a high-performance polyurethane coating, employing the following technical solution:

[0022] A method for preparing a high-performance polyurethane coating includes the following steps: adding polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer to a modified polyurethane emulsion, stirring and dispersing at a speed of 500-800 rpm for 30-40 minutes, then adding deionized water and stirring until uniformly mixed to obtain the high-performance polyurethane coating.

[0023] In summary, this application has the following beneficial effects:

[0024] This application utilizes the initial reaction of propylene glycol block polyether and polycaprolactone diol with dicyclohexylmethane diisocyanate. The propylene glycol block polyether provides good flexibility and elasticity, while the polycaprolactone diol provides hardness and crystallinity. This allows for the polymerization of a prepolymer with certain hardness and flexibility. The subsequent addition of polytetrahydrofuran ether diol improves the hydrolysis resistance of the final product, effectively optimizes the molecular chain structure, and modifies the unique network structure of the modified polyurethane emulsion, thus optimizing tear resistance and abrasion resistance. Introducing different soft segments (propylene glycol block polyether, polycaprolactone diol, and polytetrahydrofuran ether diol) at different stages forms a more complex and ordered microphase separation structure, improving the mechanical properties and thermal stability of the material.

[0025] This application combines 1,4-butanediol and triglycidyl isocyanate. 1,4-Butanediol reacts with dicyclohexylmethane diisocyanate to increase the length and rigidity of the polyurethane molecular chains. The shorter molecular chains reduce the distance between chains, enhancing intermolecular forces and thus improving the tensile strength and hardness of the material. Triglycidyl isocyanate contains multiple active epoxy groups, which can react with hydroxyl and amino functional groups on the polyurethane chains to form cross-linked structures between molecular chains, further enhancing the mechanical properties of the material, such as increasing compressive strength, hardness, and modulus. The introduction of triglycidyl isocyanate improves the chemical stability of the modified polyurethane emulsion. Its triazine ring in its molecular structure exhibits high chemical stability and good resistance to various chemicals, including acids, alkalis, and solvents. When it works in conjunction with 1,4-butanediol, the cross-linked structure formed between polyurethane molecular chains provides a stronger barrier to the penetration of chemicals, preventing chemicals from reacting with the active sites of polyurethane molecular chains and improving the stability of the material in harsh chemical environments. In addition, the cross-linked structure can reduce the flow and softening of molecular chains at high temperatures, allowing the material to maintain a certain shape and properties in high-temperature environments and improving thermal stability.

[0026] In the preparation of the anti-corrosion filler, this application first utilizes 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to generate a silane precursor. During the subsequent reaction of the silane precursor with nano-zinc oxide and zinc acrylate, the complex structure formed by the active functional groups introduced by allyl thiol and mercaptoethanol prevents the aggregation of nano-zinc oxide. When well-dispersed, nano-zinc oxide can form a denser physical barrier layer, effectively blocking the penetration of corrosive media (such as moisture, oxygen, and corrosive ions), enhancing the physical barrier properties of the anti-corrosion filler, and thus improving the anti-corrosion effect. The presence of the functional groups introduced by allyl thiol and mercaptoethanol in the anti-corrosion filler provides a chemical protection mechanism. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments.

[0028] The polyester resin (model: JQ-196) used in the embodiments and comparative examples of this invention was purchased from Langfang Jingqian Environmental Protection Technology Co., Ltd.; the amino resin (item number: HH11804QSLFS) was purchased from Tengyi Material Supply Station, Xigong District, Luoyang City; sodium hexametaphosphate was purchased from Shouguang Jincheng Chemical Co., Ltd.; dipropylene glycol butyl ether was purchased from Jinan Yingshun Chemical Co., Ltd.; organic modified polysiloxane defoamer (model: BSM11486) was purchased from Qingdao Baisenmao New Material Co., Ltd.; organotin drying agent (model: T-18A) was purchased from Nanxiong Santuo Chemical Industry Co., Ltd.; ultraviolet absorber UV328 was purchased from Xuzhou Pengsu New Material Co., Ltd.; propylene glycol block polyether (model: polyether L-35) was purchased from The following products were purchased from Jiangsu Haian Petrochemical Plant: Polycaprolactone diol (model: l7891236) from Wuhan Kemike Biomedical Technology Co., Ltd.; Dicyclohexylmethane diisocyanate from Jiangsu Runfeng Synthetic Technology Co., Ltd.; Polytetrahydrofuran ether diol (molecular weight: 1800) from Shandong Haochen New Material Technology Co., Ltd.; Triglycidyl isocyanate from Binzhou Shuangfeng Chemical Co., Ltd.; Propyltriethoxysilane isocyanate from Hubei Xinyuhong Biomedical Technology Co., Ltd.; Nano zinc oxide (particle size: kpl-4525823) from Shandong Kepler Biotechnology Co., Ltd.; Zinc acrylate from Hubei Xinghengye Technology Co., Ltd.; Allyl thiol from Hubei Xinghengye Technology Co., Ltd.

[0029] Examples 1-3 provide a high-performance polyurethane coating and its preparation method.

[0030] Example 1

[0031] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0032] The preparation method of the modified polyurethane emulsion is as follows:

[0033] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, the temperature was raised to 80°C, and the reaction was carried out for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was carried out for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization. The content of the modified polyurethane emulsion is 60%, with the addition of deionized water. After stirring at 1000 rpm for 20 minutes, the emulsion is obtained. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0034] The specific steps for preparing the anti-corrosion filler are as follows:

[0035] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0036] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0037] A method for preparing a high-performance polyurethane coating includes the following steps:

[0038] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0039] Example 2

[0040] A high-performance polyurethane coating comprises 40 parts modified polyurethane emulsion, 11 parts polyester resin, 6 parts amino resin, 20 parts anti-corrosion filler, 1 part dispersant, 2 parts film-forming agent, 1 part defoamer, 0.8 parts drier, 0.8 parts light stabilizer, and 18 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0041] The preparation method of the modified polyurethane emulsion is as follows:

[0042] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and reacted at 60°C and 350 rpm for 1.5 h. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, and the temperature was raised to 85°C and reacted for 2 h. Next, 1,4-butanediol and triglycidyl isocyanate were added, and the reaction was carried out for 1.5 h. The temperature was then lowered to 38°C, and triethylamine was added for neutralization. The neutralization was controlled. The concentration was 75%. Deionized water was added, and the mixture was stirred at 1250 rpm for 25 minutes to obtain a modified polyurethane emulsion. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate, and deionized water was 18:36:42:0.03:16:7:3.5:0.8:135.

[0043] The specific steps for preparing the anti-corrosion filler are as follows:

[0044] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 70°C and react at a stirring speed of 400 rpm for 5 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 11:4.5:3:60. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 4:0.8.

[0045] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 65℃, stir for 4 hours at 500 rpm, cool to room temperature, filter, wash and dry at 70℃ for 18 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:4:6:65.

[0046] A method for preparing a high-performance polyurethane coating includes the following steps:

[0047] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 700 rpm for 35 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0048] Example 3

[0049] A high-performance polyurethane coating comprises 50 parts modified polyurethane emulsion, 12 parts polyester resin, 8 parts amino resin, 22 parts anti-corrosion filler, 2 parts dispersant, 3 parts film-forming agent, 2 parts defoamer, 1 part drier, 1 part light stabilizer, and 25 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0050] The preparation method of the modified polyurethane emulsion is as follows:

[0051] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 70°C and 400 rpm for 2 hours. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, the temperature was raised to 90°C, and the reaction was carried out for 3 hours. Next, 1,4-butanediol and triglycidyl isocyanate were added, and the reaction was carried out for 2 hours. The temperature was then lowered to 42°C, and triethylamine was added for neutralization, with the neutralization controlled. The viscosity was 85%. Deionized water was added, and the mixture was stirred at 1500 rpm for 30 minutes to obtain a modified polyurethane emulsion. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate, and deionized water was 20:42:50:0.05:18:8:4:1:150.

[0052] The specific steps for preparing the anti-corrosion filler are as follows:

[0053] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 80°C and react at a stirring speed of 500 rpm for 6 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 12:5:4:70. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 5:1.

[0054] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 75°C, stir for 5 hours at 600 rpm, cool to room temperature, filter, wash and dry at 80°C for 24 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:5:8:80.

[0055] A method for preparing a high-performance polyurethane coating includes the following steps:

[0056] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 800 rpm for 40 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0057] Comparative Example 1

[0058] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0059] The preparation method of the modified polyurethane emulsion is as follows:

[0060] Polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, and the mixture was heated to 80°C and reacted for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the mixture was reacted for 1 hour. The mixture was then cooled to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization to [value missing]. Add 60% deionized water and stir at 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion. The mass ratio of polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 37.5:35:0.01:22.5:6:3:0.5:120.

[0061] The specific steps for preparing the anti-corrosion filler are as follows:

[0062] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0063] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0064] A method for preparing a high-performance polyurethane coating includes the following steps:

[0065] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0066] Comparative Example 2

[0067] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0068] The preparation method of the modified polyurethane emulsion is as follows:

[0069] Propylene glycol block polyether, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reactor and stirred at 60°C and 300 rpm for 1 hour. Then, polytetrahydrofuran ether glycol and 2,2-dimethylolpropionic acid were slowly added, the temperature was raised to 80°C, and the reaction was continued for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was continued for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, with the neutralization controlled. The concentration was 60%. Deionized water was added, and the mixture was stirred at 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion. The mass ratio of propylene glycol block polyether, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water was 30:35:0.01:30:6:3:0.5:120.

[0070] The specific steps for preparing the anti-corrosion filler are as follows:

[0071] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0072] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0073] A method for preparing a high-performance polyurethane coating includes the following steps:

[0074] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0075] Comparative Example 3

[0076] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0077] The preparation method of the modified polyurethane emulsion is as follows:

[0078] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, 2,2-dimethylolpropionic acid was slowly added, the temperature was raised to 80°C, and the reaction was continued for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was continued for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization to [value missing]. Add 60% deionized water and stir at 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 22.5:37.5:35:0.01:6:3:0.5:120.

[0079] The specific steps for preparing the anti-corrosion filler are as follows:

[0080] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0081] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0082] A method for preparing a high-performance polyurethane coating includes the following steps:

[0083] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0084] Comparative Example 4

[0085] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0086] The preparation method of the modified polyurethane emulsion is as follows:

[0087] Propylene glycol block polyether, polycaprolactone diol, polytetrahydrofuran ether diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, 2,2-dimethylolpropionic acid was slowly added, the temperature was raised to 80°C, and the reaction was carried out for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was carried out for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization. The content of the emulsion is 60%, and deionized water is added. After stirring at 1000 rpm for 20 minutes, a modified polyurethane emulsion is obtained. The mass ratio of propylene glycol block polyether, polycaprolactone diol, polytetrahydrofuran ether diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 15:30:15:35:0.01:6:3:0.5:120.

[0088] The specific steps for preparing the anti-corrosion filler are as follows:

[0089] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0090] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0091] A method for preparing a high-performance polyurethane coating includes the following steps:

[0092] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0093] Comparative Example 5

[0094] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0095] The preparation method of the modified polyurethane emulsion is as follows:

[0096] Polytetrahydrofuran ether glycol, polycaprolactone glycol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Propylene glycol block polyether and 2,2-dimethylolpropionic acid were then slowly added, and the temperature was raised to 80°C and reacted for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was continued for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization. The content of the modified polyurethane emulsion is 60%, with the addition of deionized water. After stirring at 1000 rpm for 20 minutes, the emulsion is obtained. The mass ratio of polytetrahydrofuran ether diol, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, propylene glycol block polyether, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0097] The specific steps for preparing the anti-corrosion filler are as follows:

[0098] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0099] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0100] A method for preparing a high-performance polyurethane coating includes the following steps:

[0101] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0102] Comparative Example 6

[0103] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0104] The preparation method of the modified polyurethane emulsion is as follows:

[0105] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, the temperature was raised to 80°C, and the reaction was continued for 1 hour. Next, 1,4-butanediol was added, and the reaction was continued for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization. The reaction was then controlled. With a viscosity of 60%, deionized water was added, and the mixture was stirred at 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, and deionized water was 15:30:35:0.01:15:6:3:120.

[0106] The specific steps for preparing the anti-corrosion filler are as follows:

[0107] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and a mercapto compound to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain a silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound, and toluene is 10:4:2:50. The mercapto compound consists of mercaptoethanol and allyl thiol in a mass ratio of 3:0.5.

[0108] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0109] A method for preparing a high-performance polyurethane coating includes the following steps:

[0110] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0111] Comparative Example 7

[0112] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0113] The preparation method of the modified polyurethane emulsion is as follows:

[0114] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, the temperature was raised to 80°C, and the reaction was carried out for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was carried out for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization. The content of the modified polyurethane emulsion is 60%, with the addition of deionized water. After stirring at 1000 rpm for 20 minutes, the emulsion is obtained. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0115] The specific steps for preparing the anti-corrosion filler are as follows:

[0116] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and mercaptoethanol to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain the silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercaptoethanol, and toluene is 10:4:2:50.

[0117] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0118] A method for preparing a high-performance polyurethane coating includes the following steps:

[0119] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0120] Comparative Example 8

[0121] A high-performance polyurethane coating comprises 30 parts modified polyurethane emulsion, 10 parts polyester resin, 5 parts amino resin, 18 parts anti-corrosion filler, 0.5 parts dispersant, 0.5 parts film-forming agent, 0.1 parts defoamer, 0.5 parts drier, 0.5 parts light stabilizer, and 10 parts deionized water. The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drier is an organotin drier; and the light stabilizer is UV328, an ultraviolet absorber.

[0122] The preparation method of the modified polyurethane emulsion is as follows:

[0123] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, and dibutyltin dilaurate were added to a reaction vessel and stirred at 60°C and 300 rpm for 1 hour. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid were slowly added, the temperature was raised to 80°C, and the reaction was carried out for 1 hour. Next, 1,4-butanediol and triglycidyl isocyanurate were added, and the reaction was carried out for 1 hour. The temperature was then lowered to 35°C, and triethylamine was added for neutralization, controlling the degree of neutralization. The content of the modified polyurethane emulsion is 60%, with the addition of deionized water. After stirring at 1000 rpm for 20 minutes, the emulsion is obtained. The mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, triglycidyl isocyanate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0124] The specific steps for preparing the anti-corrosion filler are as follows:

[0125] Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, and allyl thiol to toluene. Under nitrogen protection, heat to 60°C and react at a stirring speed of 300 rpm for 4 hours. Cool to room temperature, filter, wash, and dry to obtain the silane precursor. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, allyl thiol, and toluene is 10:4:2:50.

[0126] Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55°C, stir for 3 hours at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain corrosion-resistant filler. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene is 10:2:5:50.

[0127] A method for preparing a high-performance polyurethane coating includes the following steps:

[0128] Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500 rpm for 30 minutes. Then, deionized water is added and stirred until homogeneous to obtain a high-performance polyurethane coating.

[0129] Performance testing

[0130] The comprehensive performance of the high-performance polyurethane coatings prepared in Examples 1-3 and Comparative Examples 1-8 of this application is as follows:

[0131] After removing air bubbles, the high-performance polyurethane coatings prepared in the above examples and comparative examples were uniformly coated on the surface of the decorative board to obtain a 1.5 mm thick coating. The coating was formed at 23°C and 60% relative humidity and cured for 4 days to obtain the coating sample to be tested.

[0132] Water resistance: Tested according to national standard GB / T 1733-1993, at 25℃ for 72 hours; divided into four levels, with level 1 being the best and level 4 the worst. Level 1: No change in paint film; Level 2: Slight blistering of paint film, no peeling; Level 3: Minor wrinkling and peeling of paint film, partial rusting; Level 4: Bubbling, wrinkling, peeling and rusting of paint film.

[0133] Adhesion: Tested according to national standard GB / T 9286-2021, divided into 0-5 levels, with level 0 being the best and level 5 being the worst;

[0134] Tensile strength and elongation at break: tested in accordance with national standard GB / T 19250-2013;

[0135] Acid and alkali resistance test: The test was conducted in accordance with the relevant standards of the national standard GB / T 9274-1988;

[0136] Impact resistance test: Tested according to international standard ASTM D2794-2019;

[0137] The specific test results are shown in Table 1 below.

[0138] Table 1 Performance parameters of the high-performance polyurethane coatings in Examples 1-3 and Comparative Examples 1-8

[0139] Test performance Water resistance Adhesion Tensile strength / MPa Elongation at break / % <![CDATA[Acid resistance / 5% H2SO4]]> Alkali resistance / 5% NaOH Impact resistance / kg·m Example 1 Level 1 Level 0 12.4 693 960h paint film without peeling or bubbling 960h paint film without peeling or bubbling 1.1 Example 2 Level 1 Level 0 12.7 686 960h paint film without peeling or bubbling 960h paint film without peeling or bubbling 1.2 Example 3 Level 1 Level 0 12.6 671 960h paint film without peeling or bubbling 960h paint film without peeling or bubbling 1.1 Comparative Example 1 Level 3 Level 3 7.9 557 The paint film showed obvious peeling and blistering after 960 hours. The paint film showed obvious peeling and blistering after 960 hours. 0.7 Comparative Example 2 Level 2 Level 3 8.3 546 The paint film showed obvious peeling and blistering after 960 hours. The paint film showed obvious peeling and blistering after 960 hours. 0.6 Comparative Example 3 Level 3 Level 3 9.3 578 The paint film showed obvious peeling and blistering after 960 hours. The paint film showed obvious peeling and blistering after 960 hours. 0.7 Comparative Example 4 Level 3 Level 2 9.5 588 960h paint film does not peel off, slight bubbling 960h paint film does not peel off, slight bubbling 0.9 Comparative Example 5 Level 3 Level 2 9.2 563 960h paint film does not peel off, slight bubbling 960h paint film does not peel off, slight bubbling 0.8 Comparative Example 6 Level 3 Level 1 10.3 604 The paint film showed obvious peeling and blistering after 960 hours. The paint film showed obvious peeling and blistering after 960 hours. 0.6 Comparative Example 7 Level 1 Level 1 11.6 627 960h paint film does not peel off, slight bubbling The paint film showed obvious peeling and blistering after 960 hours. 0.8 Comparative Example 8 Level 1 Level 1 10.8 611 960h paint film does not peel off, slight bubbling The paint film showed obvious peeling and blistering after 960 hours. 0.7

[0140] As shown in Table 1, the high-performance polyurethane coating prepared in this application has excellent water resistance. After long-term immersion, the coating film does not blister or peel off. It exhibits outstanding mechanical properties and excellent chemical corrosion resistance. In addition, it also has good impact resistance.

[0141] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-performance polyurethane coating, characterized in that, The high-performance polyurethane coating comprises 30-50 parts modified polyurethane emulsion, 10-12 parts polyester resin, 5-8 parts amino resin, 18-22 parts anti-corrosion filler, 0.5-2 parts dispersant, 0.5-3 parts film-forming agent, 0.1-2 parts defoamer, 0.5-1 part drier, 0.5-1 part light stabilizer, and 10-25 parts deionized water; The modified polyurethane emulsion is prepared by: Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate are added to a reaction vessel and stirred at 60-70℃ for 1-2 hours. Then, polytetrahydrofuran ether diol and 2,2-dimethylolpropionic acid are slowly added, the temperature is raised to 80-90℃, and the reaction is carried out for 1-3 hours. Then, 1,4-butanediol and triglycidyl isocyanurate are added, and the reaction is carried out for 1-2 hours. The temperature is lowered to 35-42℃, triethylamine is added for neutralization, and the degree of neutralization is controlled to be 60-85%. Deionized water is added, and the mixture is stirred at 1000-1500 rpm for 20-30 minutes to obtain a modified polyurethane emulsion. The mass ratio of the propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dimethylolpropionic acid, 1,4-butanediol, and triglycidyl isocyanate is 15-20:30-42:35-50:0.01-0.05:15-18:6-8:3-4:0.5-1; The specific steps for preparing the corrosion-resistant filler are as follows: Step 1: Add 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate and mercapto compound to toluene, heat to 60-80℃ under nitrogen protection, react for 4-6 hours, cool to room temperature, filter, wash and dry to obtain silane precursor; Step 2: Add silane precursor, nano zinc oxide and zinc acrylate to toluene, heat to 55-75℃, stir and react for 3-5 hours, cool to room temperature, filter, wash, and dry at 60-80℃ for 12-24 hours to obtain corrosion-resistant filler. The mass ratio of 3-aminopropyltriethoxysilane, propyltriethoxysilane isocyanate, mercapto compound and toluene in step 1 is 10-12:4-5:2-4:50-70; In step 1, the thiol compound is composed of mercaptoethanol and allyl thiol in a mass ratio of 3-5:0.5-1. The mass ratio of silane precursor, nano zinc oxide, zinc acrylate and toluene in step 2 is 10:2-5:5-8:50-80.

2. The high-performance polyurethane coating according to claim 1, characterized in that, The dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoamer is an organically modified polysiloxane defoamer; the drying agent is an organotin drying agent; and the light stabilizer is one or more of azircon ultraviolet absorbers, hindered amine light stabilizers, and hindered phenolic light stabilizers.

3. A method for preparing a high-performance polyurethane coating as described in any one of claims 1-2, characterized in that, The specific preparation steps are as follows: Polyester resin, amino resin, anti-corrosion filler, dispersant, film-forming agent, defoamer, drier, and light stabilizer are added to the modified polyurethane emulsion. The mixture is stirred and dispersed at 500-800 rpm for 30-40 minutes. Then, deionized water is added and stirred until the mixture is homogeneous to obtain a high-performance polyurethane coating.