High-performance polyurethane coating and preparation method thereof

Abstract

The invention relates to the technical field of coating preparation, in particular to a high-performance polyurethane coating and a preparation method thereof.The preparation method of the high-performance polyurethane coating comprises the steps that polyester resin, amino resin, anti-corrosion filler, a dispersing agent, a film-forming agent, a defoaming agent, a drier and a light stabilizer are added into modified polyurethane emulsion, stirring and dispersing are conducted, and then the high-performance polyurethane coating is obtained. And adding deionized water, and uniformly stirring and mixing to obtain the high-performance polyurethane coating. The high-performance polyurethane coating prepared by the invention has excellent water resistance, a paint film is free of blistering and peeling after being soaked for a long time, the high-performance polyurethane coating is outstanding in mechanical property and excellent in chemical corrosion resistance, and in addition, the high-performance polyurethane coating also has good impact resistance.

Description

Technical Field

[0001] The present application relates to the technical field of coating preparation, and more specifically, to a high-performance polyurethane coating and a preparation method thereof. Background Art

[0002] As a widely used type of coating, polyurethane coatings 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 high humidity environments, water molecules can easily penetrate into the coating film, react with incompletely cured isocyanate groups, generate carbon dioxide gas, and then cause bubbles to form. At the same time, the intrusion of water will also destroy the internal structure of the coating, causing the coating to turn white and soften, which not only affects the appearance of the coating, but also reduces the protective performance of the coating and shortens its service life. On the other hand, in the face of increasingly complex usage scenarios, although the polyurethane coating itself has a certain chemical corrosion resistance, when encountering extremely corrosive media such as strong acids, alkalis, and organic solvents, its chemical bonds are easily destroyed. In the prior art, in order to enhance corrosion resistance, a method of adding a large amount of inorganic fillers is often used, but this will cause the construction performance of the coating to deteriorate, such as reduced leveling, and defects such as pinholes in the coating. In summary, it is urgent to develop a high-performance polyurethane coating with good water resistance and chemical corrosion resistance. Summary of the invention

[0004] In order to solve the technical problems mentioned in the background technology, the present application provides a high-performance polyurethane coating and a preparation method thereof.

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

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

[0007] Preferably, the preparation method of the modified polyurethane emulsion is:

[0008] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate are added to a reaction kettle, stirred and reacted at 60-70°C for 1-2h, polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid are slowly added thereto, the temperature is raised to 80-90°C, the reaction is carried out for 1-3h, 1,4-butanediol and triglycidyl isocyanurate are added thereto, the reaction is carried out for 1-2h, the temperature is lowered to 35-42°C, triethylamine is added for neutralization, the neutralization degree is controlled to be 60-85%, deionized water is added, and the mixture is stirred at a stirring speed of 1000-1500rpm for 20-30min to obtain a modified polyurethane emulsion.

[0009] Preferably, the mass ratio of the propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetramethylene glycol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, and triglycidyl isocyanurate 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 anticorrosive filler comprises the following specific steps:

[0011] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a mercapto compound to toluene, heating to 60-80° C. under nitrogen protection, reacting for 4-6 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor;

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

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

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

[0015] Preferably, the mass ratio of the 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 defoaming agent is an organic modified polysiloxane defoaming agent.

[0019] Preferably, the drier is an organotin drier.

[0020] Preferably, the light stabilizer is one or more of an oxazine-based ultraviolet light absorber, a hindered amine-based light stabilizer, and a hindered phenol-based light stabilizer.

[0021] In a second aspect, the present application also provides a method for preparing a high-performance polyurethane coating, using the following technical solution:

[0022] A method for preparing a high-performance polyurethane coating comprises the following steps: adding polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to a modified polyurethane emulsion, stirring and dispersing the mixture at a speed of 500-800 rpm for 30-40 minutes, adding deionized water, stirring and mixing the mixture evenly, and obtaining the high-performance polyurethane coating.

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

[0024] This application utilizes propylene glycol block polyether and polycaprolactone diol to react with dicyclohexylmethane diisocyanate in the initial stage. Propylene glycol block polyether provides good flexibility and elasticity, while polycaprolactone diol can provide hardness and crystallinity. It can be polymerized to generate a prepolymer with certain hardness and flexibility. The subsequent addition of polytetrahydrofuran ether diol can improve the hydrolysis resistance of the final product, effectively optimize the molecular chain structure, and modify the special network structure of the polyurethane emulsion to optimize the tear resistance and wear resistance. Different soft segments (propylene glycol block polyether, polycaprolactone diol and polytetrahydrofuran ether diol) are introduced at different stages to form a more complex and ordered microphase separation structure, improving the mechanical properties and thermal stability of the material.

[0025] This application uses 1,4-butanediol and triglycidyl isocyanurate in combination. 1,4-butanediol can react with dicyclohexylmethane diisocyanate to increase the length and rigidity of the polyurethane molecular chain. Its shorter molecular chain can shorten the distance between the molecular chains and enhance the intermolecular force, thereby improving the tensile strength and hardness of the material. Triglycidyl isocyanurate contains multiple active epoxy groups, which can react with functional groups such as hydroxyl and amino groups on the polyurethane chain to form a cross-linked structure between the molecular chains, further enhancing the mechanical properties of the material, such as improving the compressive strength, hardness and modulus of the material. The introduction of triglycidyl isocyanurate can improve the chemical stability of the modified polyurethane emulsion. The triazine ring in its molecular structure has high chemical stability, good tolerance to a variety of chemical substances, and can resist the erosion of chemical substances such as acids, alkalis, and solvents. When it works together with 1,4-butanediol, the cross-linked structure formed between the polyurethane molecular chains can provide a stronger barrier to the penetration of chemical substances, prevent chemical substances from reacting with the active sites of the polyurethane molecular chains, and improve the stability of the material in harsh chemical environments. In addition, the cross-linked structure can reduce the flow and softening of the molecular chains at high temperatures, so that the material can still maintain a certain shape and performance in a high temperature environment, thereby improving thermal stability.

[0026] In the preparation of the anticorrosive filler, the present application first uses 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and mercapto compounds to generate a silane precursor. In the subsequent reaction process of the silane precursor with nano zinc oxide and zinc acrylate, the active functional groups introduced by allyl mercaptan and mercaptoethanol participate in the reaction to form a complex structure that can prevent the agglomeration of nano zinc oxide. When nano zinc oxide is well dispersed, it can form a denser physical barrier layer, effectively blocking the penetration of corrosive media (such as moisture, oxygen, corrosive ions, etc.), enhancing the physical barrier properties of the anticorrosive filler, and thus improving the anticorrosion effect. The presence of the functional groups introduced by allyl mercaptan and mercaptoethanol in the anticorrosive filler can provide a chemical protection mechanism for the anticorrosive filler. DETAILED DESCRIPTION

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

[0028] The polyester resin (model: JQ-196) used in the examples of the present invention and the comparative examples was purchased from Langfang Jingqian Environmental Protection Technology Co., Ltd.; the amino resin (article 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 Materials Co., Ltd.; organic tin drier (model: T-18A) was purchased from Nanxiong Santuo Chemical Industry Co., Ltd.; ultraviolet absorber UV328 was purchased from Xuzhou Pengsu New Materials Co., Ltd.; propylene glycol block polyether (model: polyether L-35) was purchased from Hai'an Petrochemical Plant, Jiangsu Province; polycaprolactone diol (model: l7891236) was purchased from Wuhan Kemik Biomedical Technology Co., Ltd.; dicyclohexylmethane diisocyanate was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.; polytetramethyleneimine ether diol (molecular weight: 1800) was purchased from Shandong Haochen New Materials Technology Co., Ltd.; triglycidyl isocyanurate was purchased from Binzhou Shuangfeng Chemical Co., Ltd.; isocyanatepropyl triethoxysilane was purchased from Hubei Xinyuhong Biomedical Technology Co., Ltd.; nano zinc oxide (particle size: kpl-4525823) was purchased from Shandong Kepler Biotechnology Co., Ltd.; zinc acrylate was purchased from Hubei Xinghengye Technology Co., Ltd.; allyl mercaptan was purchased from Hubei Xinghengye Technology Co., Ltd.

[0029] Embodiment 1-3 provides a high-performance polyurethane coating and a preparation method thereof.

[0030] Example 1

[0031] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0032] Wherein, the preparation method of modified polyurethane emulsion is:

[0033] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate were added to the reactor, stirred at 60°C and 300 rpm for 1 hour, polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid were slowly added thereto, the temperature was raised to 80°C, the reaction was carried out for 1 hour, 1,4-butanediol and triglycidyl isocyanurate were added thereto, the temperature was lowered to 35°C, triethylamine was added for neutralization, and the degree of neutralization was controlled The mixture is stirred at a stirring speed of 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion, wherein the mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0034] The specific steps for preparing the anticorrosive filler are as follows:

[0035] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0038] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0039] Example 2

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

[0041] Wherein, the preparation method of modified polyurethane emulsion is:

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

[0043] The specific steps for preparing the anticorrosive filler are as follows:

[0044] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, heating to 70°C under nitrogen protection, stirring at a speed of 400 rpm, reacting for 5 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 11:4.5:3:60; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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°C, stir to react for 4 hours, stir at 500 rpm, cool to room temperature, filter, wash, and dry at 70°C for 18 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0047] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 700 rpm for 35 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0048] Example 3

[0049] A high-performance polyurethane coating comprises 50 parts of modified polyurethane emulsion, 12 parts of polyester resin, 8 parts of amino resin, 22 parts of anticorrosive filler, 2 parts of dispersant, 3 parts of film-forming agent, 2 parts of defoaming agent, 1 part of drying agent, 1 part of light stabilizer, and 25 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0050] Wherein, the preparation method of modified polyurethane emulsion is:

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

[0052] The specific steps for preparing the anticorrosive filler are as follows:

[0053] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 80°C, stirring at a speed of 500 rpm, reacting for 6 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 12:5:4:70; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 5 hours, stir at 600 rpm, cool to room temperature, filter, wash, and dry at 80°C for 24 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0056] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 800 rpm for 40 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0057] Comparative Example 1

[0058] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0059] Wherein, the preparation method of modified polyurethane emulsion is:

[0060] Add polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate into a reactor, stir at 60°C with a stirring speed of 300 rpm for 1 hour, then slowly add polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid, heat to 80°C, react for 1 hour, then add 1,4-butanediol and triglycidyl isocyanurate, react for 1 hour, cool to 35°C, add triethylamine for neutralization, and control the neutralization degree to 60%, deionized water was added, and the mixture was stirred at a stirring speed of 1000 rpm for 20 min to obtain a modified polyurethane emulsion, wherein the mass ratio of polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetramethylene glycol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water was 37.5:35:0.01:22.5:6:3:0.5:120.

[0061] The specific steps for preparing the anticorrosive filler are as follows:

[0062] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0065] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0066] Comparative Example 2

[0067] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0068] Wherein, the preparation method of modified polyurethane emulsion is:

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

[0070] The specific steps for preparing the anticorrosive filler are as follows:

[0071] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0074] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0075] Comparative Example 3

[0076] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0077] Wherein, the preparation method of modified polyurethane emulsion is:

[0078] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate were added to the reactor, stirred at 60°C with a stirring speed of 300 rpm for 1 hour, and then 2,2-dihydroxymethylpropionic acid was slowly added thereto, the temperature was raised to 80°C, and the reaction was carried out for 1 hour. Then 1,4-butanediol and triglycidyl isocyanurate were added thereto, the temperature was lowered to 35°C, and triethylamine was added for neutralization, and the degree of neutralization was controlled to be 60%, deionized water was added, and the mixture was stirred at a stirring speed of 1000 rpm for 20 min to obtain a modified polyurethane emulsion, wherein the mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water was 22.5:37.5:35:0.01:6:3:0.5:120.

[0079] The specific steps for preparing the anticorrosive filler are as follows:

[0080] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0083] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0084] Comparative Example 4

[0085] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0086] Wherein, the preparation method of modified polyurethane emulsion is:

[0087] Propylene glycol block polyether, polycaprolactone diol, polytetramethylene glycol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate were added to the reactor, stirred at 60°C and 300 rpm for 1 hour, and then 2,2-dihydroxymethylpropionic acid was slowly added thereto, the temperature was raised to 80°C, and the reaction was carried out for 1 hour. Then 1,4-butanediol and triglycidyl isocyanurate were added thereto, the temperature was lowered to 35°C, and triethylamine was added for neutralization to control the degree of neutralization. The mixture is stirred at a stirring speed of 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion, in which the mass ratios of propylene glycol block polyether, polycaprolactone diol, polytetramethylene glycol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water are 15:30:15:35:0.01:6:3:0.5:120.

[0088] The specific steps for preparing the anticorrosive filler are as follows:

[0089] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0092] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0093] Comparative Example 5

[0094] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0095] Wherein, the preparation method of modified polyurethane emulsion is:

[0096] Add polytetrahydrofuran ether diol, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate into a reactor, stir at 60°C and 300 rpm for 1 hour, then slowly add propylene glycol block polyether and 2,2-dimethylolpropionic acid, heat to 80°C, react for 1 hour, then add 1,4-butanediol and triglycidyl isocyanurate, react for 1 hour, cool to 35°C, add triethylamine for neutralization, and control the degree of neutralization The mixture is stirred at a stirring speed of 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion, wherein the mass ratio of polytetramethylene glycol, polycaprolactone glycol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, propylene glycol block polyether, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0097] The specific steps for preparing the anticorrosive filler are as follows:

[0098] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0101] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0102] Comparative Example 6

[0103] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0104] Wherein, the preparation method of modified polyurethane emulsion is:

[0105] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate were added to the reactor, stirred at 60°C and 300 rpm for 1 hour, polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid were slowly added thereto, the temperature was raised to 80°C, the reaction was continued for 1 hour, 1,4-butanediol was added thereto, the reaction was continued for 1 hour, the temperature was lowered to 35°C, triethylamine was added for neutralization, and the reaction mixture was controlled to be molten. The degree of homogeneity is 60%, deionized water is added, and the mixture is stirred at a stirring speed of 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion, in which the mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetramethylene glycol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol and deionized water is 15:30:35:0.01:15:6:3:120.

[0106] The specific steps for preparing the anticorrosive filler are as follows:

[0107] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a thiol compound to toluene, under nitrogen protection, heating to 60°C, stirring at a speed of 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, thiol compound and toluene is 10:4:2:50; the thiol compound is composed of mercaptoethanol and allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0110] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0111] Comparative Example 7

[0112] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0113] Wherein, the preparation method of modified polyurethane emulsion is:

[0114] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate were added to the reactor, stirred at 60°C and 300 rpm for 1 hour, polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid were slowly added thereto, the temperature was raised to 80°C, the reaction was carried out for 1 hour, 1,4-butanediol and triglycidyl isocyanurate were added thereto, the temperature was lowered to 35°C, triethylamine was added for neutralization, and the degree of neutralization was controlled The mixture is stirred at a stirring speed of 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion, wherein the mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0115] The specific steps for preparing the anticorrosive filler are as follows:

[0116] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and mercaptoethanol to toluene, under nitrogen protection, heating to 60°C, stirring at 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0119] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0120] Comparative Example 8

[0121] A high-performance polyurethane coating comprises 30 parts of modified polyurethane emulsion, 10 parts of polyester resin, 5 parts of amino resin, 18 parts of anticorrosive filler, 0.5 parts of dispersant, 0.5 parts of film-forming agent, 0.1 parts of defoaming agent, 0.5 parts of drying agent, 0.5 parts of light stabilizer and 10 parts of deionized water, wherein the dispersant is sodium hexametaphosphate; the film-forming agent is dipropylene glycol butyl ether; the defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is an ultraviolet absorber UV328.

[0122] Wherein, the preparation method of modified polyurethane emulsion is:

[0123] Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate were added to the reactor, stirred at 60°C and 300 rpm for 1 hour, polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid were slowly added thereto, the temperature was raised to 80°C, the reaction was carried out for 1 hour, 1,4-butanediol and triglycidyl isocyanurate were added thereto, the temperature was lowered to 35°C, triethylamine was added for neutralization, and the degree of neutralization was controlled The mixture is stirred at a stirring speed of 1000 rpm for 20 minutes to obtain a modified polyurethane emulsion, wherein the mass ratio of propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetrahydrofuran ether diol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol, triglycidyl isocyanurate and deionized water is 15:30:35:0.01:15:6:3:0.5:120.

[0124] The specific steps for preparing the anticorrosive filler are as follows:

[0125] Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and allyl mercaptan to toluene, under nitrogen protection, heating to 60°C, stirring at 300 rpm, reacting for 4 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor, wherein the mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, allyl mercaptan 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 to react for 3 hours, stir at 400 rpm, cool to room temperature, filter, wash, and dry at 60°C for 12 hours to obtain an anti-corrosion filler, wherein 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 comprises the following steps:

[0128] Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500 rpm for 30 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.

[0129] Performance Testing

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

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

[0132] Water resistance: Tested in accordance with national standard GB / T 1733-1993, tested at 25℃ for 72h; divided into 1-4 levels, 1 is the best, 4 is the worst, 1: no change in the paint film; 2: slight bubbling of the paint film, no shedding; 3: a small amount of wrinkling and shedding of the paint film, and partial rust; 4: the paint film is bubbling, wrinkling, shedding and rusting;

[0133] Adhesion: Tested in accordance with the national standard GB / T 9286-2021, divided into levels 0-5, 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: Tested in accordance with the relevant standards of national standard GB / T 9274-1988;

[0136] Impact resistance test: Tested in accordance with the international standard ASTM D2794-2019;

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

[0138] Table 1 Performance parameters of 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% H 2 SO 4 > Alkali resistance / 5%NaOH Impact resistance / kg·m Example 1 Level 1 Level 0 12.4 693 960h paint film does not fall off or bubble 960h paint film does not fall off or bubble 1.1 Example 2 Level 1 Level 0 12.7 686 960h paint film does not fall off or bubble 960h paint film does not fall off or bubble 1.2 Example 3 Level 1 Level 0 12.6 671 960h paint film does not fall off or bubble 960h paint film does not fall off or bubble 1.1 Comparative Example 1 Level 3 Level 3 7.9 557 960h The paint film peeled off and bubbled obviously 960h The paint film peeled off and bubbled obviously 0.7 Comparative Example 2 Level 2 Level 3 8.3 546 960h The paint film peeled off and bubbled obviously 960h The paint film peeled off and bubbled obviously 0.6 Comparative Example 3 Level 3 Level 3 9.3 578 960h The paint film peeled off and bubbled obviously 960h The paint film peeled off and bubbled obviously 0.7 Comparative Example 4 Level 3 Level 2 9.5 588 960h paint film does not fall off, slight bubbling 960h paint film does not fall off, slight bubbling 0.9 Comparative Example 5 Level 3 Level 2 9.2 563 960h paint film does not fall off, slight bubbling 960h paint film does not fall off, slight bubbling 0.8 Comparative Example 6 Level 3 Level 1 10.3 604 960h The paint film peeled off and bubbled obviously 960h The paint film peeled off and bubbled obviously 0.6 Comparative Example 7 Level 1 Level 1 11.6 627 960h paint film does not fall off, slight bubbling 960h The paint film peeled off and bubbled obviously 0.8 Comparative Example 8 Level 1 Level 1 10.8 611 960h paint film does not fall off, slight bubbling 960h The paint film peeled off and bubbled obviously 0.7

[0140] As can be seen from Table 1, the high-performance polyurethane coating prepared in the present application has excellent water resistance. After long-term immersion, the paint film has no blistering or peeling. It has outstanding mechanical properties and exhibits excellent chemical corrosion resistance. In addition, it also has good impact resistance.

[0141] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A high performance polyurethane coating, characterized in that: The high-performance polyurethane coating comprises 30-50 parts of modified polyurethane emulsion, 10-12 parts of polyester resin, 5-8 parts of amino resin, 18-22 parts of anticorrosive filler, 0.5-2 parts of dispersant, 0.5-3 parts of film former, 0.1-2 parts of defoamer, 0.5-1 parts of drying agent, 0.5-1 parts of light stabilizer and 10-25 parts of deionized water.

2. The high performance polyurethane coating according to claim 1, characterized in that: The preparation method of the modified polyurethane emulsion is: Propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate and dibutyltin dilaurate are added to a reaction kettle, stirred and reacted at 60-70°C for 1-2h, polytetrahydrofuran ether diol and 2,2-dihydroxymethyl propionic acid are slowly added thereto, the temperature is raised to 80-90°C, the reaction is carried out for 1-3h, 1,4-butanediol and triglycidyl isocyanurate are added thereto, the reaction is carried out for 1-2h, the temperature is lowered to 35-42°C, triethylamine is added for neutralization, the neutralization degree is controlled to be 60-85%, deionized water is added, and the mixture is stirred at a stirring speed of 1000-1500rpm for 20-30min to obtain a modified polyurethane emulsion.

3. The high performance polyurethane coating according to claim 2, characterized in that: The mass ratio of the propylene glycol block polyether, polycaprolactone diol, dicyclohexylmethane diisocyanate, dibutyltin dilaurate, polytetramethylene glycol, 2,2-dihydroxymethylpropionic acid, 1,4-butanediol and triglycidyl isocyanurate is 15-20: 30-42: 35-50: 0.01-0.05: 15-18: 6-8: 3-4: 0.5-1.

4. The high performance polyurethane coating according to claim 1, characterized in that: The preparation of the anticorrosive filler comprises the following specific steps: Step 1, adding 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane and a mercapto compound to toluene, heating to 60-80° C. under nitrogen protection, reacting for 4-6 hours, cooling to room temperature, filtering, washing and drying to obtain a silane precursor; Step 2: Add silane precursor, nano zinc oxide and zinc acrylate into toluene, heat to 55-75° C., stir to react for 3-5 hours, cool to room temperature, filter, wash, and dry at 60-80° C. for 12-24 hours to obtain an anticorrosive filler.

5. The high performance polyurethane coating according to claim 4, characterized in that: The mass ratio of 3-aminopropyltriethoxysilane, isocyanatepropyltriethoxysilane, mercapto compound and toluene in step 1 is 10-12:4-5:2-4:50-70.

6. The high performance polyurethane coating according to claim 4, characterized in that: In the step 1, the thiol compound is composed of mercaptoethanol and allyl mercaptan in a mass ratio of 3-5:0.5-1.

7. The high performance polyurethane coating according to claim 4, characterized in that: The mass ratio of the silane precursor, nano zinc oxide, zinc acrylate and toluene in step 2 is 10:2-5:5-8:50-80.

8. 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 defoaming agent is an organic modified polysiloxane defoaming agent; the drying agent is an organic tin drying agent; and the light stabilizer is one or more of an oxazine ultraviolet absorber, a hindered amine light stabilizer, and a hindered phenol light stabilizer.

9. A method for preparing a high-performance polyurethane coating according to any one of claims 1 to 8, characterized in that: The specific preparation steps are as follows: Add polyester resin, amino resin, anticorrosive filler, dispersant, film former, defoamer, drying agent and light stabilizer to the modified polyurethane emulsion, stir and disperse at a speed of 500-800 rpm for 30-40 minutes, then add deionized water, stir and mix evenly to obtain a high-performance polyurethane coating.