A thin-layer high-impact low-temperature anticorrosion coating, a preparation method and application thereof

Abstract

The present application provides a kind of anticorrosive paint, the paint is a thin layer high impact low temperature anticorrosive paint, which is prepared from component A and component B, component A is prepared from low surface energy modified elastic polyurethane resin, surface treated anticorrosive filler, surface treated weather resistant filler, wetting dispersant, leveling agent and organic solvent raw materials; component B is isocyanate curing agent component.The paint provided by the present application has excellent corrosion and ice prevention performance, and is easy to apply and maintain, can meet the protection requirements of ship navigation in polar low temperature marine environment conditions, reduce the risk of hull and superstructure corrosion and icing affecting navigation safety.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of above-water hull anticorrosion materials, and relates to an anticorrosion coating and a preparation method and application thereof, in particular to a thin-layer high-impact low-temperature anticorrosion coating and a preparation method and application thereof. BACKGROUND

[0002] The polar region is located in the high latitude area, and the winter lasts more than half a year, the temperature is as low as-70 DEG C, the weather and the sea state are extremely complex, and environmental factors such as sea ice, low temperature, snow, sea fog always endanger the navigation safety. When the ship sails in the polar region, the above-water area directly contacts the external low-temperature marine environment, the macromolecular chain movement of the traditional organic coating is frozen under the condition of-70 DEG C, the coating elasticity is poor, the embrittlement phenomenon is obvious, when the coating surface is iced, artificial deicing is needed by using shovel, chisel and other tools, at this time, the coating is easy to crack and fall off under the impact of external force and cannot be repaired immediately, and the substrate is directly exposed to the environment, increasing the risk of corrosion.

[0003] The above-water hull and superstructure surface protection still generally uses alcohol, chlorinated rubber, acrylic, epoxy, polyurethane and other coating systems, and the total thickness of the coating is generally more than 400 microns, which meets the basic corrosion protection requirements. It is found during navigation that the thick coating with a thickness of more than 300 microns is easy to crack and fall off under the condition of extremely low temperature in the polar region, especially when the crew uses shovel, chisel and other tools to knock and deice the ice layer, which causes the coating to crack and even fall off with the ice layer, losing the protection effect.

[0004] Therefore, how to find a more suitable anticorrosion coating to solve the above-mentioned problems that the existing coating cannot meet the needs of the ship sailing in the polar region at extremely low temperature and ensure easy deicing and anticorrosion during sailing in the polar region has become one of the problems to be solved by many forward-looking researchers in the industry. SUMMARY

[0005] Therefore, the technical problem to be solved by the application is to provide an anticorrosion coating and a preparation method and application thereof, in particular a thin-layer high-impact low-temperature anticorrosion coating. The anticorrosion coating provided by the application is a thin-layer polar low-temperature protective coating with ice and corrosion prevention functions. Under the condition of thin coating thickness, the coating still has excellent mechanical properties, ice and corrosion prevention properties at low temperature, and can meet the needs of anticorrosion and protection of the above-water area of the ship sailing in the polar region.

[0006] The application provides an anticorrosion coating, raw materials of which include component A and component B.

[0007] The component A includes the following components in terms of raw material mass fraction:

[0008]

[0009] The B component comprises an isocyanate curing agent;

[0010] The molar ratio of -OH in the A component to -NCO in the B component is 1:(1.0-1.2).

[0011] Preferably, the A component comprises, in parts by mass of raw material:

[0012]

[0013] The molar ratio of -OH in the A component to -NCO in the B component is 1:(1.0-1.1).

[0014] Preferably, the modified elastic polyurethane resin comprises a low-surface-energy modified elastic polyurethane resin;

[0015] The surface-treated corrosion-resistant filler comprises a polyisocyanate surface-coated corrosion-resistant filler containing a perfluoroalkyl chain segment;

[0016] The surface-treated weather-resistant filler comprises a polyisocyanate surface-coated weather-resistant filler containing a perfluoroalkyl chain segment;

[0017] The corrosion-resistant coating is a thin-layer corrosion-resistant coating;

[0018] The coating thickness of the corrosion-resistant coating is 180-220 μm.

[0019] Preferably, the surface coating is performed by a surface coating treatment agent prepared from a polyisocyanate containing a perfluoroalkyl chain segment and a solvent;

[0020] The mass content of the polyisocyanate containing a perfluoroalkyl chain segment in the surface coating treatment agent is 16%-20%;

[0021] The solvent comprises one or more of an aromatic solvent, an ester solvent, and an ether ester solvent;

[0022] A dispersing aid is further added in the surface coating process;

[0023] The corrosion-resistant coating is a low-temperature corrosion-resistant coating.

[0024] Preferably, the coating layer of the surface coating has a thickness of 10-50 nm;

[0025] The mass ratio of the polyisocyanate containing a perfluoroalkyl chain segment to the corrosion-resistant coating is (0.2-0.4):1000;

[0026] The mass ratio of the polyisocyanate containing a perfluoroalkyl chain segment to the weather-resistant filler is (0.2-0.4):1000;

[0027] The coating of the anticorrosive paint has a tensile strength greater than or equal to 12 MPa at -70 DEG C;

[0028] The coating of the anticorrosive paint has an elongation at break greater than or equal to 10% at -70 DEG C.

[0029] Preferably, the modified elastic polyurethane resin comprises a WN-FA0 type modified polyurethane resin;

[0030] The anticorrosive filler comprises zinc phosphate, strontium chromate, mica powder and talc powder;

[0031] The weather-resistant filler comprises rutile titanium white powder, hollow glass microbeads and silicone resin microspheres;

[0032] The anticorrosive paint is an impact-resistant anticorrosive paint.

[0033] Preferably, the mass ratio of the zinc phosphate, strontium chromate, mica powder and talc powder is (1.5-2.0):(1.5-2.0):1:1;

[0034] The mass ratio of the rutile titanium white powder, hollow glass microbeads and silicone resin microspheres is (1.5-2.0):1:1;

[0035] The particle size of the hollow glass microbeads is 20-30 mu m;

[0036] The particle size of the silicone resin microspheres is 6-8 mu m.

[0037] Preferably, the wet dispersant comprises a polysiloxane containing a pigment affinity group;

[0038] The leveling agent comprises a silicone polyether copolymer;

[0039] The organic solvent comprises one or more of an aromatic solvent, an ester solvent and an ether ester solvent;

[0040] The B component comprises a trimer of an aliphatic isocyanate.

[0041] The present application provides a preparation method of the anticorrosive paint as described in any one of the above technical solutions, comprising the following steps:

[0042] 1) mixing a modified elastic polyurethane resin, an anticorrosive filler subjected to surface treatment, a weather-resistant filler subjected to surface treatment, a wet dispersant and an organic solvent, grinding to a fineness of 20-30 mu m, adding a leveling agent, mixing again to obtain the A component;

[0043] Mixing the A component with the B component to obtain the anticorrosive paint.

[0044] The application further provides application of the anticorrosion coating in any one of the above technical solutions or the anticorrosion coating prepared by the preparation method in the above technical solution on a ship body.

[0045] The application provides an anticorrosion coating, raw materials of which include a component A and a component B; the component A includes 100 parts by weight of a modified elastic polyurethane resin, 7-15 parts by weight of a surface-treated anticorrosive filler, 10-15 parts by weight of a surface-treated weather-resistant filler, 1.0-1.8 parts by weight of a wetting dispersant, 1.0-1.8 parts by weight of a leveling agent and 15-25 parts by weight of an organic solvent, according to the mass fraction of the raw materials; the component B includes an isocyanate curing agent; and the molar ratio of -OH in the component A to -NCO in the component B is 1:(1.0-1.2). Compared with the prior art, the application considers that the traditional heavy-duty anticorrosion coating is used above the water surface of a ship, the coating is generally more than 400 microns, and cracking easily occurs under the condition of extremely low temperature in the polar region, especially when the surface is iced and needs to be deiced by external force, cracking and even peeling are more likely to be induced, in addition, under the condition of low temperature, the coating cannot be repaired and constructed, the base material is exposed to the marine environment, the corrosion risk is intensified and other multiple problems exist.

[0046] The application creatively designs a polar region extremely low temperature protective coating with a thin layer and specific components and a ratio, and the thin layer has the functions of anti-icing and anti-corrosion, under the premise that the paint film thickness is about 200 microns, excellent aging resistance, high impact resistance and anti-corrosion are achieved, in order to achieve the same anti-corrosion characteristics under the condition of a thin layer, the coating also has excellent hydrophobicity, water droplets can freely roll on the surface of the coating and cannot form a continuous water film, the long-term accumulation of corrosive water film on the surface of the coating is avoided, the anti-corrosion medium penetration ability of the coating is improved, and the good anti-corrosion characteristics are further ensured.

[0047] The thin layer high-impact low-temperature anticorrosion coating provided by the application has a bottom-surface integrated type, has the anti-corrosion performance of a primer and the high weather resistance of a topcoat, and the total thickness is reduced by more than 50% compared with the total thickness of the traditional primer and topcoat, and the thin coating thickness still has excellent mechanical properties, anti-icing and anti-corrosion properties under low temperature, has smaller coating thickness and stronger external force impact resistance, can meet the requirements of ship surface protection and deicing, and reduces the risk of polar navigation.

[0048] Moreover, the coating provided by the application uses a modified elastic polyurethane resin as a film-forming material, is constructed by using an air spraying method, is dried and cured at room temperature, is simple to construct and convenient to maintain, can solve the problems of thick coating of the existing heavy-duty anticorrosion coating above the water surface of a ship, cracking under the condition of polar region extremely low temperature, deicing difficulty, easy peeling and the like, and can meet the requirements of deicing difficulty and corrosion risk encountered when a ship navigates in a polar region extremely low temperature environment.

[0049] The experimental results show that the coating prepared by the application has the following performances: water contact angle OCA 20 contact angle instrument test (sessile drop method), ≥120°; tensile strength, -70℃ (GB / T 528), ≥12MPa; elongation at break, -70℃ (GB / T 528), ≥10%; artificial accelerated aging UVB / 3000h (GB / T 14522), no powdering, blistering, cracking, peeling and corrosion phenomenon; salt spray test, 3000h (GB / T 1771), no blistering, cracking, peeling and corrosion phenomenon. DETAILED DESCRIPTION

[0050] In order to further understand the application, the preferred embodiments of the application are described below in combination with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the application, and are not limitations to the application claims.

[0051] All raw materials of the application are not particularly limited in source, and can be purchased on the market or prepared according to conventional methods well known to those skilled in the art.

[0052] The raw materials used in the application are not particularly limited in purity, and the application preferably has analytical purity or conventional purity in the field of ship anticorrosive coating manufacturing.

[0053] The grade and abbreviation of all raw materials of the application belong to conventional grade and abbreviation in the art, and each grade and abbreviation is clear and explicit in the field of its relevant use, and those skilled in the art can purchase or prepare according to conventional methods according to the grade, abbreviation and corresponding use.

[0054] The abbreviation of all processes of the application belongs to conventional abbreviation in the art, and each abbreviation is clear and explicit in the field of its relevant use, and those skilled in the art can understand the conventional process steps according to the abbreviation.

[0055] The application provides an anticorrosive coating, and raw materials include component A and component B.

[0056] The component A includes the following components in raw material mass parts:

[0057]

[0058] The component B includes isocyanate curing agent.

[0059] The molar ratio of -OH in the component A to -NCO in the component B is 1:(1.0-1.2).

[0060] In the present application, the surface-treated anticorrosive filler is added in an amount of 7-15 parts by weight, or 8-14 parts by weight, or 9-13 parts by weight, or 10-12 parts by weight.

[0061] In the present application, the surface-treated weather-resistant filler is added in an amount of 10-15 parts by weight, or 11-14 parts by weight, or 12-13 parts by weight.

[0062] In the present application, the wetting dispersant is added in an amount of 1.0-1.8 parts by weight, or 1.15-1.65 parts by weight, or 1.3-1.5 parts by weight.

[0063] In the present application, the leveling agent is added in an amount of 1.0-1.8 parts by weight, or 1.15-1.65 parts by weight, or 1.3-1.5 parts by weight.

[0064] In the present application, the organic solvent is added in an amount of 15-25 parts by weight, or 17-23 parts by weight, or 19-21 parts by weight.

[0065] In the present application, the molar ratio of -OH in the A component to -NCO in the B component is 1:(1.0-1.2), or 1:(1.04-1.16), or 1:(1.08-1.12).

[0066] In the present application, the A component, in terms of parts by mass of raw materials, can specifically include:

[0067]

[0068] The molar ratio of -OH in the A component to -NCO in the B component is 1:(1.0-1.1).

[0069] In the present application, the modified elastic polyurethane resin preferably includes a low-surface-energy modified elastic polyurethane resin. Specifically, it can be WN-FA0 modified polyurethane resin (Marine Chemical Research Institute Co., Ltd.).

[0070] In the present application, the surface-treated anticorrosive filler preferably includes a polyisocyanate surface-coated anticorrosive filler containing a perfluoroalkyl segment.

[0071] In the present application, the surface-treated weather-resistant filler preferably includes a polyisocyanate surface-coated weather-resistant filler containing a perfluoroalkyl segment.

[0072] The polyisocyanate containing perfluoroalkyl segment in the present application can be the polyisocyanate containing perfluoroalkyl segment in the patent CN101143840A, Preparation and Application of Polyisocyanate Containing Perfluoroalkyl Segment.

[0073] In the present application, the surface coating is preferably carried out by using the surface coating agent prepared from the polyisocyanate containing perfluoroalkyl segment and the solvent (organic solvent B).

[0074] In the present application, the mass content of the polyisocyanate containing perfluoroalkyl segment in the surface coating agent is preferably 16% to 20%, more preferably 16.8% to 19.2%, and more preferably 17.6% to 18.4%.

[0075] In the present application, the solvent preferably includes one or more of aromatic solvents, ester solvents and ether ester solvents, and more preferably aromatic solvents, ester solvents or ether ester solvents. Specifically, the solvent can include one or more of xylene, aromatic hydrocarbon, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate and propylene glycol methyl ether acetate.

[0076] In the present application, a dispersing aid is preferably added during the surface coating process. The dispersing aid is preferably a general dispersing aid in the art, and specifically can include one or more of BYK163, BYK104s and BYK170.

[0077] Specifically, the surface coating process preferably includes the following steps:

[0078] (1) heating the surface coating agent to a certain temperature and keeping the temperature for a period of time;

[0079] (2) adding the dispersing aid dropwise;

[0080] (3) adding the fillers in small amounts and multiple times into the stirring agent;

[0081] (4) heating again and keeping the temperature under nitrogen;

[0082] (5) cooling to room temperature;

[0083] (6) drying after filtration.

[0084] In the present application, the thickness of the coating layer of the surface coating is preferably 10 to 50 nm, more preferably 15 to 45 nm, more preferably 20 to 40 nm, and more preferably 25 to 35 nm.

[0085] In the present application, the mass ratio of the perfluoroalkyl chain segment-containing polyisocyanate to the anticorrosive filler is preferably (0.2-0.4):1000, more preferably (0.22-0.38):1000, more preferably (0.25-0.35):1000, more preferably (0.27-0.32):1000. It can be specifically (0.3-0.4):1000.

[0086] In the present application, the mass ratio of the perfluoroalkyl chain segment-containing polyisocyanate to the anticorrosive filler is preferably (0.2-0.4):1000, more preferably (0.22-0.38):1000, more preferably (0.25-0.35):1000, more preferably (0.27-0.32):1000. It can be specifically (0.3-0.4):1000.

[0087] In the present application, the anticorrosive filler preferably includes zinc phosphate, strontium chromate, mica powder and talc powder.

[0088] In the present application, the weather-resistant filler preferably includes rutile titanium white powder, hollow glass microbeads and silicone resin microspheres.

[0089] In the present application, the mass ratio of the zinc phosphate, strontium chromate, mica powder and talc powder is preferably (1.5-2.0):(1.5-2.0):1:1, more preferably (1.6-1.9):(1.6-1.9):1:1, more preferably (1.7-1.8):(1.7-1.8):1:1.

[0090] In the present application, the mass ratio of the rutile titanium white powder, hollow glass microbeads and silicone resin microspheres is preferably (1.5-2.0):1:1, more preferably (1.6-1.9):1:1, more preferably (1.7-1.8):1:1.

[0091] In the present application, the particle size of the hollow glass microbeads is preferably 20-30 μm, more preferably 22-28 μm, more preferably 24-26 μm.

[0092] In the present application, the particle size of the silicone resin microspheres is preferably 6-8 μm, more preferably 6.4-7.6 μm, more preferably 6.8-7.2 μm.

[0093] In the present application, the wet dispersant preferably includes a polysiloxane containing a pigment affinity group. It can specifically include one or more of BYK163, BYK104s and BYK180.

[0094] In the present application, the leveling agent preferably includes a silicone polyether copolymer. It can specifically include one or more of BYK378, BYK390 and BYK388.

[0095] In the present application, the organic solvent (organic solvent A) preferably includes one or more of aromatic solvents, ester solvents and ether ester solvents, more preferably aromatic solvents, ester solvents or ether ester solvents. Specifically, it can include one or more of xylene, aromatic hydrocarbon, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate and propylene glycol methyl ether acetate.

[0096] In the present application, the B component preferably includes a trimer of aliphatic isocyanate. Specifically, it can include N3375 (Bayer) and / or N3390 (Bayer).

[0097] In the present application, the anticorrosive coating is preferably a low-temperature anticorrosive coating.

[0098] In the present application, the anticorrosive coating is preferably a thin-layer anticorrosive coating.

[0099] In the present application, the coating thickness of the anticorrosive coating is preferably 180-220 μm, more preferably 188-212 μm, more preferably 196-204 μm.

[0100] In the present application, the tensile strength of the coating of the anticorrosive coating at -70°C is preferably equal to or greater than 12 MPa, more preferably equal to or greater than 13 MPa, more preferably equal to or greater than 14 MPa.

[0101] In the present application, the elongation at break of the coating of the anticorrosive coating at -70°C is preferably equal to or greater than 10%, more preferably equal to or greater than 11%, more preferably equal to or greater than 12%.

[0102] In the present application, the anticorrosive coating is preferably an impact-resistant anticorrosive coating.

[0103] The present application provides the use of a surface-treated anticorrosive filler in an anticorrosive coating.

[0104] In the present application, the anticorrosive coating preferably further includes a surface-treated weather-resistant filler.

[0105] In the present application, the anticorrosive coating can specifically be a modified elastic polyurethane resin-based anticorrosive coating.

[0106] In the present application, in the anticorrosive coating, the mass ratio of the surface-treated anticorrosive filler to the modified elastic polyurethane resin is 7%-15%.

[0107] In the present application, in the anticorrosive coating, the mass ratio of the surface-treated weather-resistant filler to the modified elastic polyurethane resin is 10%-15%.

[0108] In the above application of the present application, the content and its specific preferred schemes can correspond to the content and its preferred schemes in the aforementioned anticorrosive coating one by one, which will not be described one by one here.

[0109] The present application provides a preparation method of the anticorrosive coating according to any one of the above technical solutions, comprising the following steps:

[0110] 1) mixing the modified elastic polyurethane resin, the surface-treated anticorrosive filler, the surface-treated weather-resistant filler, the wetting dispersant and the organic solvent, grinding to a fineness of 20-30 μm, then adding the leveling agent, mixing again to obtain the component A;

[0111] mixing the component A with the component B to obtain the anticorrosive coating.

[0112] The coating provided by the present application has excellent anticorrosion and anti-icing performance, and is simple to operate and convenient to maintain, which can meet the protection requirements of the ship sailing in the polar low-temperature marine environment, and reduce the corrosion of the ship body and superstructure and the icing affecting the safety of navigation.

[0113] The present application is a complete and detailed overall technical solution, which better ensures the composition and ratio of the anticorrosive coating, and further improves the comprehensive performance of the anticorrosive coating and the comprehensive performance at low temperature. The above thin-layer high-impact low-temperature anticorrosive coating and the preparation method thereof can specifically include the following content:

[0114] A thin-layer high-impact low-temperature anticorrosive coating, which is prepared from a component A and a component B;

[0115] The component A is prepared from raw materials including a low-surface-energy modified elastic polyurethane resin, a surface-treated anticorrosive filler, a surface-treated weather-resistant filler, a wetting dispersant, a leveling agent and an organic solvent;

[0116] Taking 100 parts by weight of the modified elastic polyurethane resin, the components are as follows in parts by weight:

[0117]

[0118] The component B is an isocyanate curing agent component;

[0119] The molar ratio of -OH in the component A to -NCO in the component B is 1:(1.0-1.2);

[0120] Specifically, taking 100 parts by weight of the modified elastic polyurethane resin, the components are as follows in parts by weight:

[0121]

[0122]

[0123] The B component is an isocyanate curing agent component;

[0124] The molar ratio of -OH of the A component to -NCO of the B component is 1:(1.0-1.1).

[0125] Specifically, the surface-treated anticorrosive filler is a mixture of zinc phosphate, strontium chromate, mica powder, and talc powder;

[0126] The surface-treated weather-resistant filler is a mixture of rutile titanium dioxide, hollow glass microbeads, and silicone resin microspheres;

[0127] The hollow glass microbeads have a particle size of 20-30 μm;

[0128] The silicone resin microspheres have a particle size of 6-8 μm.

[0129] Specifically, the mass ratio of zinc phosphate, strontium chromate, mica powder, and talc powder is (1.5-2.0):(1.5-2.0):1:1; preferably (1.7-2.0):(1.7-2.0):1:1.

[0130] The mass ratio of rutile titanium dioxide, hollow glass microbeads, and silicone resin microspheres is (1.5-2.0):1:1; preferably (1.8-2.0):1:1.

[0131] Specifically, the zinc phosphate, strontium chromate, mica powder, talc powder, rutile titanium dioxide, hollow glass microbeads, and silicone resin microspheres are surface-coated with a surface-coating treatment agent prepared by mixing a polyisocyanate containing a perfluoroalkyl segment with an organic solvent B;

[0132] The polyisocyanate containing a perfluoroalkyl segment in the surface-coating treatment agent has a mass ratio of 16%-20%.

[0133] Specifically, the wet dispersing agent is a polysiloxane containing a pigment-affinity group.

[0134] The leveling agent is a silicone polyether copolymer.

[0135] Specifically, the organic solvent A and the organic solvent B are each independently selected from at least one of an aromatic solvent, an ester solvent, and an ether ester solvent; preferably at least one of xylene, an aromatic hydrocarbon compound, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate, and propylene glycol methyl ether acetate.

[0136] Specifically, the B component is a trimer of an aliphatic isocyanate.

[0137] The application provides a preparation method of the thin-layer high-impact low-temperature anticorrosive coating, and the method comprises the following steps:

[0138] The modified elastic polyurethane resin, the surface-treated anticorrosive filler, the surface-treated weather-resistant filler, the wetting dispersant and the organic solvent raw material are mixed and ground to a fineness of 20-30 microns, the leveling agent is added, and the mixture is stirred uniformly and filtered to obtain the component A;

[0139] The obtained component A and the component B are uniformly mixed according to the molar ratio to obtain the thin-layer high-impact low-temperature anticorrosive coating.

[0140] Further,

[0141] One of the purposes of the application is to provide a thin-layer high-impact low-temperature anticorrosive coating.

[0142] The thin-layer high-impact low-temperature anticorrosive coating is prepared from the component A and the component B;

[0143] The component A is prepared from raw materials including a low-surface-energy modified elastic polyurethane resin, a surface-treated anticorrosive filler, a surface-treated weather-resistant filler, a wetting dispersant, a leveling agent and an organic solvent;

[0144] The modified elastic polyurethane resin is 100 parts by weight, and the components are parts by weight:

[0145]

[0146] The component B is an isocyanate curing agent component;

[0147] The molar ratio of -OH in the component A to -NCO in the component B is 1:(1.0-1.2), preferably 1:(1.0-1.1).

[0148] Specifically, the -OH in the component A comes from the modified elastic polyurethane, and the -OH content can be 0.94 mol / kg.

[0149] Specifically, the modified elastic polyurethane resin in the component A is WN-FA0 resin produced by Haoyang Chemical Research Institute Co., Ltd., and the performance is shown in Table 1. Table 1 shows the performance of the thin-layer high-impact low-temperature anticorrosive coating when the modified elastic polyurethane resin in the component A is WN-FA0 resin produced by Haoyang Chemical Research Institute Co., Ltd.

[0150] Table 1

[0151]

[0152]

[0153] The properties of the modified elastic polyurethane resin are as listed in Table 1, and the modified elastic polyurethane resin provides necessary mechanical properties of a coating in a polar low-temperature environment, low surface energy waterproof and moistureproof, and basic salt mist resistance. By adding special fillers in the modified elastic polyurethane resin matrix, while ensuring good shielding effect, smaller internal stress at low temperature is realized, and cracking or even peeling off from the surface of the substrate under the action of external force is avoided, and the interaction and mutual cooperation between the resin and the fillers realize the purpose of the application.

[0154] In one preferred embodiment of the present application:

[0155] The powder in the A component comprises two types, which are a surface-treated anticorrosive filler and a surface-treated weather-resistant filler, and the purpose of surface treatment of the anticorrosive filler and the weather-resistant filler is to improve the shielding ability of the filler system to water molecules and the anti-permeation ability by using the hydrophobic water resistance of a low-surface-energy compound.

[0156] The surface-treated anticorrosive filler is a mixture of zinc phosphate, strontium chromate, mica powder and talc powder.

[0157] Zinc phosphate forms a complex with the iron-based surface in the presence of chromate ions, is firmly combined with the paint film, and prevents further corrosion, and zinc phosphate is used in combination with the rust-proof filler strontium chromate in the initial stage of corrosion prevention.

[0158] The content of chromium trioxide in strontium chromate is higher than that in zinc yellow, the water solubility is 1 times smaller than that of traditional zinc chromate yellow, the content of formed chromate ions is large, the rust prevention ability is strong, in addition, strontium chromate has good light resistance, which is better than other chromate fillers, and can be used in combination as a bottom-surface integrated coating.

[0159] Mica powder and talc powder are common sheet anticorrosive fillers, and unlike conventional anticorrosive coatings, the mica powder and talc powder selected in the present application are of super-fine grade (1250 mesh or more), which ensures better appearance quality.

[0160] The above fillers have good anticorrosive effect after surface coating treatment by a low-surface-energy compound.

[0161] In one preferred embodiment of the present application:

[0162] The mass ratio of zinc phosphate, strontium chromate, mica powder and talc powder is (1.5-2.0):(1.5-2.0):1:1, and preferably (1.7-2.0):(1.7-2.0):1:1.

[0163] The surface-treated weather-resistant filler is rutile titanium dioxide, hollow glass microspheres and silicone resin microspheres. Rutile titanium dioxide has high refractive index, less absorption of light and strong scattering ability, which can effectively improve the light aging resistance of the coating. The main role of hollow glass microspheres and silicone resin microspheres is to further improve the blocking and reflection of sunlight.

[0164] The particle size of the hollow glass microspheres is 20-30 μm.

[0165] The particle size of the silicone resin microspheres is 6-8 μm.

[0166] In a preferred embodiment of the present application:

[0167] The mass ratio of titanium dioxide, hollow glass microspheres and silicone resin microspheres is (1.5-2.0):1:1, preferably (1.8-2.0):1:1.

[0168] The rutile titanium dioxide, hollow glass microspheres and silicone resin microspheres have excellent light shielding effect after surface coating treatment by a low surface energy compound.

[0169] In a preferred embodiment of the present application:

[0170] The zinc phosphate, strontium chromate, mica powder, talc powder, rutile titanium dioxide, hollow glass microspheres and silicone resin microspheres are surface-coated by a surface coating treatment agent prepared by mixing a polyisocyanate containing perfluoroalkyl segments and an organic solvent B;

[0171] The polyisocyanate containing perfluoroalkyl segments and the organic solvent B are mixed to prepare the surface coating treatment agent, wherein the polyisocyanate containing perfluoroalkyl segments accounts for 16-20%, and the rest is the organic solvent B;

[0172] The polyisocyanate containing perfluoroalkyl segments in the present application is the polyisocyanate containing perfluoroalkyl segments in the patent application (patent number CN101143840A, invention title "Preparation and application of polyisocyanate containing perfluoroalkyl segments").

[0173] The treatment process comprises the following steps:

[0174] (1) The surface coating treatment agent is heated to 30-40℃ and kept for 30-60 min;

[0175] (2) 1-3‰ of a dispersing aid is added dropwise;

[0176] (3) A small amount of various fillers is added to the stirring treatment agent for several times;

[0177] (4) The temperature is raised to 60-65℃, and nitrogen is filled and kept for 3-4 h;

[0178] (5) cooling to room temperature;

[0179] (6) after filtration, drying in an oven at 80-85℃ for 45-48h and then standby;

[0180] The dispersing aid is a general dispersing aid in the art, preferably BYK163, BYK104s or BYK170, etc.

[0181] The wet dispersing agent is at least one of BYK163, BYK104s, BYK180; and / or.

[0182] The leveling agent is a silicone polyether copolymer; preferably at least one of BYK378, BYK390, BYK388.

[0183] In a preferred embodiment of the present application:

[0184] The organic solvent A and the organic solvent B can adopt the organic solvent commonly used in the art in the prior art, and are independently selected from at least one of aromatic solvents, ester solvents, ether ester solvents; preferably at least one of xylene, aromatic hydrocarbon, butyl acetate, ethyl acetate, ethylene glycol ethyl ether acetate, propylene glycol methyl ether acetate.

[0185] In a preferred embodiment of the present application:

[0186] The B component is a trimer of aliphatic isocyanate; preferably at least one of N3375, N3390 of Bayer Company.

[0187] The second object of the present application is to provide a preparation method of a thin-layer high-impact low-temperature corrosion-resistant coating, comprising:

[0188] The raw materials including the modified elastic polyurethane resin, the surface-treated corrosion-resistant filler, the surface-treated weather-resistant filler, the wet dispersing agent, and the organic solvent are mixed and ground to a fineness of 20-30μm, the leveling agent is added, and the mixture is stirred uniformly and filtered to obtain the A component;

[0189] The obtained A component and the B component are mixed uniformly according to the molar ratio to obtain the thin-layer high-impact low-temperature corrosion-resistant coating.

[0190] The present application can specifically adopt the following technical solutions:

[0191] The various raw materials are weighed according to the above amount;

[0192] The pigments and fillers are dried and prepared for use; the modified elastic polyurethane resin, the surface-treated anticorrosive filler, the surface-treated weather-resistant filler, the wetting dispersant and the organic solvent are mixed and then added into a basket sand mill for grinding, and the grinding fineness is 20-30 microns; after the grinding, the leveling agent is added, and the mixture is stirred and dispersed at 2000 rpm for 30 minutes, filtered through a 120-mesh screen, and tested for viscosity (cup-4) and packaged.

[0193] The method for applying the coating is spraying or brushing;

[0194] The coating is applied for 2-3 times, and the total thickness of the coating is controlled to be 180-200 microns.

[0195] The third object of the present application is to provide an application of the thin-layer high-impact-resistance low-temperature anticorrosive coating.

[0196] The present application provides an application of the anticorrosive coating in the above technical solution or the anticorrosive coating prepared by the preparation method in the above technical solution on a ship body.

[0197] In the present application, the ship body preferably refers to the area above the water surface of a ship, and specifically can be the surface of the ship body and superstructure.

[0198] In the present application, the ship body can be the ship body of a ship for extremely low-temperature navigation or polar extremely low-temperature navigation.

[0199] In the present application, the anticorrosive coating can be a one-coat paint.

[0200] Specifically, the application of the thin-layer high-impact-resistance low-temperature anticorrosive coating in the above technical solution or the thin-layer high-impact-resistance low-temperature anticorrosive coating prepared by the method in the above technical solution on the surface of the ship body and superstructure.

[0201] The above content of the present application provides a thin-layer high-impact-resistance low-temperature anticorrosive coating, a preparation method and an application thereof. The polar extremely low-temperature protective coating with a specific component and ratio, a thin layer and ice and corrosion prevention functions designed in the present application realizes excellent aging resistance, high impact resistance and corrosion resistance on the premise that the paint film thickness is about 200 microns. In order to realize the same corrosion prevention characteristics under the condition of a thin layer, the coating also has excellent hydrophobicity, and water droplets can freely roll on the surface of the coating without forming a continuous water film, thereby avoiding long-term accumulation of a corrosive water film on the surface of the coating, improving the penetration resistance of the coating to corrosive media, and further guaranteeing good corrosion prevention characteristics.

[0202] The thin-layer high-impact low-temperature anticorrosive coating provided by the application has a bottom-surface integrated coating, has the anticorrosive performance of a primer and the high weather resistance of a topcoat, and has a total thickness reduced by more than 50% than that of a traditional primer and topcoat combination, and still has excellent mechanical properties, ice prevention and anticorrosive performance at low temperature under a thin coating thickness, has smaller coating thickness and stronger external force impact resistance, and can meet the requirements of ship surface protection and ice removal and reduce the risk of polar navigation.

[0203] The coating provided by the application uses modified elastic polyurethane resin as a film-forming material, is applied by an air spraying method, is dried and cured at room temperature, is simple to apply and convenient to maintain, can solve the problems of thick coating, cracking under extremely low temperature, ice removal difficulty and easy falling of existing above-water heavy-duty anticorrosive coatings for ships, can meet the ice removal difficulty and corrosion risk encountered by ships during navigation in an extremely low temperature environment in the polar region.

[0204] The experimental results show that the coating prepared by the application has a water contact angle of ≥120° when sprayed on a ship steel structure and tested by an OCA20 contact angle instrument (sessile drop method), a tensile strength of ≥12 MPa at-70℃ (GB / T 528), an elongation at break of ≥10% at-70℃ (GB / T 528), no powdering, bubbling, cracking, falling and corrosion phenomenon after artificial accelerated aging UVB / 3000h (GB / T 14522), and no bubbling, cracking, falling and corrosion phenomenon after a salt spray test for 3000h (GB / T 1771).

[0205] In order to further illustrate the application, the anticorrosive coating, the preparation method and application thereof provided by the application are described in detail below in combination with examples, but it should be understood that these examples are implemented on the premise of the technical scheme of the application, give detailed implementation modes and specific operation processes, and are only for further illustrating the features and advantages of the application, but not for limiting the claims of the application, and the protection scope of the application is not limited to the following examples.

[0206] The raw materials used in the examples and comparative examples are all conventional commercially available raw materials.

[0207] The parts in the examples and comparative examples all refer to parts by weight.

[0208] Referring to Table 2, Table 2 is a raw material specification table in the examples of the application.

[0209] Table 2

[0210] Serial number Raw material Model Factory 1 Modified polyurethane resin WN-FA0 Marine Chemical Research Institute Co., Ltd. 2 Zinc phosphate -- Shandong Xuguang Chemical Co., Ltd. 3 Strontium chromate -- Hubei Shenneng Chemical Technology Co., Ltd. 4 Mica powder 1250 mesh Shijiazhuang Runze Gold Mine Product Co., Ltd. 5 Talc powder 1250 mesh Lingshou Jiashuo Building Material Processing Co., Ltd. 6 Rutile titanium dioxide R996 Shijiazhuang Duo Yi Chemical Technology Co., Ltd. 7 Hollow glass microbeads Y-15000 Maanshan Mining Institute New Material Technology Co., Ltd. 8 Spherical silicone resin microspheres HY-7000 Zhejiang Hangyu Technology Co., Ltd. 7 Wetting dispersant 163 / 104s / 180 BYK 8 Leveling agent 378 / 390 / 388 BYK 9 Xylene -- Qingdao Hailigia 10 Butyl acetate -- Qingdao Hailigia 11 Propylene glycol methyl ether acetate -- Qingdao Hailigia 12 Curing agent N3375 / N3390 Bayer

[0211] The testing instrument is a water contact angle instrument OCA20 of LAUDA Scientific, Germany.

[0212] Example 1

[0213] Surface coating treatment of fillers:

[0214] 1. The surface coating agent (mass ratio of polyisocyanate containing perfluoroalkyl segment is 16%, and the rest is butyl acetate solvent) is warmed to 42°C and kept for 30 min;

[0215] 2. 1.5‰ of BYK163 dispersant is added dropwise;

[0216] 3. The fillers to be coated are added into the stirred surface coating agent in batches;

[0217] 4. The temperature is raised to 65°C, and nitrogen is filled and kept for 4 h;

[0218] 5. The temperature is lowered to room temperature;

[0219] 6. After suction filtration, the fillers are dried in an oven at 80°C for 45 h and then stored;

[0220] Group A component: modified elastic polyurethane resin is 100 parts by weight; zinc phosphate after the above surface treatment is 4 parts by weight; strontium chromate is 4 parts by weight; mica powder is 2 parts by weight; talc is 2 parts by weight; rutile titanium dioxide is 6 parts by weight; hollow glass microbeads are 3 parts by weight; silicone resin microspheres are 3 parts by weight; BYK163 is 1.5 parts by weight; BYK378 is 1.5 parts by weight; butyl acetate is 20 parts by weight;

[0221] The fillers are dried and stored; the modified elastic polyurethane resin, the corrosion-resistant filler, the weather-resistant filler (rutile titanium dioxide and silicone resin microspheres), the wetting dispersant, and the organic solvent are mixed and then added into a basket sand mill for grinding, and the grinding fineness is 20-30 μm. After discharging, the hollow glass microbeads and the leveling agent are added, and the mixture is stirred and dispersed at 1500 rpm for 30 min. The viscosity of the coating (cup-4) is tested, and the coating is packaged.

[0222] Group B component N3375 is 20 parts by weight;

[0223] Molar ratio: -OH: -NCO = 1:1

[0224] The components A and B are taken in the above amounts, mixed uniformly, and left for 20 min. The coating is applied in one pass by spraying, and the dry film thickness is controlled to be about 200 μm. The performance is tested after drying.

[0225] Referring to Table 3, Table 3 is a comparison of the coating performance test results of the coatings prepared in the examples and the comparative examples.

[0226] Example 2

[0227] Surface coating treatment of fillers:

[0228] 1. The surface coating treatment agent (20% of the mass of the polyisocyanate containing perfluoroalkyl segment, the rest is xylene solvent) is warmed to 45°C, and nitrogen is filled for 10 minutes;

[0229] 2. 3‰ of BYK163 dispersant is added dropwise;

[0230] 3. The fillers are added to the stirred surface coating treatment agent in batches;

[0231] 4. The temperature is raised to 60°C, and nitrogen is filled for 3 hours;

[0232] 5. The temperature is lowered to room temperature;

[0233] 6. After suction filtration, dry in an 85°C oven for 48 hours and reserve;

[0234] The A component: 100 parts by weight of modified elastic polyurethane resin; 4.5 parts by weight of zinc phosphate after the above surface treatment; 4.5 parts by weight of strontium chromate; 3 parts by weight of mica powder; 3 parts by weight of talc; 6.4 parts by weight of rutile titanium white powder; 4.3 parts by weight of hollow glass microbeads; 4.3 parts by weight of silicone resin microspheres; 1.8 parts by weight of BYK163; 1.8 parts by weight of BYK378; 25 parts by weight of butyl acetate;

[0235] The preparation method of the A component is the same as that of Example 1;

[0236] The B component N3390 is 22 parts by weight;

[0237] Molar ratio: -OH: -NCO = 1:1.

[0238] The A and B components are taken in the above amounts, mixed uniformly, and left to stand for 20 minutes. A coating is applied in one pass using a spraying method, and the dry film coating thickness is controlled to be about 200 μm. After drying, the performance is tested.

[0239] Referring to Table 3, Table 3 is a comparison of the coating performance test results of the coatings prepared in the examples and the comparative examples of the application.

[0240] Example 3

[0241] Surface coating treatment of fillers:

[0242] 1. The surface coating treatment agent (18% of the mass of the polyisocyanate containing perfluoroalkyl segment, the rest is butyl acetate solvent) is warmed to 42°C, and nitrogen is filled for 15 minutes;

[0243] 2. 1‰ of BYK104s dispersant is added dropwise;

[0244] 3. The fillers are added to the stirred treatment agent in batches;

[0245] 4. Warm up to 65℃, nitrogen preservation for 4h;

[0246] 5. Cool down to room temperature;

[0247] 6. After filtration, dry in 80℃ oven for 45h, then reserve;

[0248] A component: modified elastic polyurethane resin is 100 parts by weight; the zinc phosphate after the above surface treatment is 2.1 parts by weight; strontium chromate is 2.1 parts by weight; mica powder is 1.4 parts by weight; talc powder is 1.4 parts by weight; rutile titanium dioxide 5 parts by weight; hollow glass microspheres 2.5 parts by weight; silicone resin microspheres 2.5 parts by weight; BYK163 is 1.0 parts by weight; BYK378 is 1.2 parts by weight; butyl acetate is 15 parts by weight;

[0249] The preparation method of the A component is the same as that of Example 1;

[0250] The B component N3390 is 24 parts by weight;

[0251] Molar ratio: -OH: -NCO = 1:1.1.

[0252] Take A and B components according to the above amount, mix uniformly, stand for 20 min, use spray coating method to coat once, the dry film coating thickness is controlled to be about 200μm, test the performance after drying.

[0253] See Table 3, Table 3 is the coating performance test results of the coating prepared by the inventive example and the comparative example.

[0254] Comparative Example 1

[0255] Comparative Example 1 is compared with Example 1, and the difference from Example 1 is that zinc phosphate: strontium chromate: mica powder: talc powder = 1:1:1:1, rutile titanium dioxide: hollow glass microspheres: silicone resin microspheres = 1:1:1

[0256] The surface coating treatment of the filler is the same as that of Example 1;

[0257] A component: modified elastic polyurethane resin is 100 parts by weight; the zinc phosphate after the surface treatment is 2 parts by weight; strontium chromate is 2 parts by weight; mica powder is 2 parts by weight; talc powder is 2 parts by weight; rutile titanium dioxide 4 parts by weight; hollow glass microspheres 4 parts by weight; silicone resin microspheres 4 parts by weight; BYK163 is 1.5 parts by weight; BYK378 is 1.5 parts by weight; butyl acetate is 20 parts by weight;

[0258] The preparation method of the A component is the same as that of Example 1;

[0259] The B component N3390 is 20 parts by weight;

[0260] Molar ratio: -OH : -NCO = 1 : 1.

[0261] The components A and B were taken in the above amounts, mixed uniformly, and allowed to stand for 20 min. One coat was applied by spraying, and the dry film coating thickness was controlled at about 200 μm. The performance was tested after drying.

[0262] Referring to Table 3, Table 3 is a comparison of the coating performance test results of the coatings prepared in the examples and comparative examples of the present application.

[0263] Comparative Example 2

[0264] Comparative Example 2 is compared with Example 2.

[0265] The main difference between Comparative Example 2 and Example 2 is that the filler used is not surface-coated, and the resin is a common polyurethane resin.

[0266] The other raw materials and amounts used in Comparative Example 2 are the same as in Example 2.

[0267] The preparation method of the components A and B and the amount ratio of the components A and B in Comparative Example 2 are the same as in Example 2.

[0268] The components A and B were taken in the above amounts, mixed uniformly, and allowed to stand for 20 min. One coat was applied by spraying, and the dry film coating thickness was controlled at about 200 μm. The performance was tested after drying.

[0269] Referring to Table 3, Table 3 is a comparison of the coating performance test results of the coatings prepared in the examples and comparative examples of the present application.

[0270] The components A and B of Examples 1 to 3 and Comparative Examples 1 to 2 were mixed uniformly, allowed to stand for 20 min, and then coated by spraying, with a coating thickness of about 200 μm. The performance is shown in Table 3.

[0271] Table 3

[0272]

[0273] The coating performance test results of Examples 1 to 3 and Comparative Examples 1 to 2 in Table 3 show that:

[0274] The coating obtained in Examples 1-3 is tested by water contact angle, tensile strength, elongation at break, and is configured according to the proportion of anticorrosive filler and weather-resistant filler, and the coating should pass the artificial accelerated aging test and salt spray test. In the comparative example 1, slight powdering occurs after UVB / 3000h of artificial accelerated aging, and local bubbling occurs after 3000h of salt spray, and corrosion occurs at individual points. Compared with Example 1, the proportion of anticorrosive fillers is 1:1:1:1, and the proportion of weather-resistant fillers is 1:1:1. After environmental testing, the coating does not pass the artificial accelerated aging and salt spray tests, proving that the deviation in the proportion causes differences in corrosion resistance and weather resistance from the normal value, indicating that the synergistic effect is not ideal after the proportion imbalance, and the aging resistance and corrosion resistance of the coating are reduced.

[0275] Compared with Example 2, the coating of Comparative Example 2 has decreased water contact angle, tensile strength, elongation at break, artificial accelerated aging, and salt spray test, proving that the modified elastic polyurethane resin and the filler system coated on the surface in the application work together to effectively improve the comprehensive performance of the coating, and the environmental performance of the coating is greatly improved. The comparative example does not fully play the chemical shielding effect of surface chemical modification + the comprehensive effect of filler function synergy, indicating that the correct selection of materials, accurate proportion, and proper process are prerequisites for achieving the outstanding effects of the application.

[0276] Therefore, the thin-layer high-impact low-temperature corrosion-resistant coating prepared by the application has excellent weather resistance, easy deicing property, and corrosion resistance, which can guarantee the protection requirements of the above-water area of polar navigation ships and reduce the risk of ship icing and corrosion problems to the safety of navigation.

[0277] The thin-layer high-impact low-temperature corrosion-resistant coating and its preparation method and application provided by the application are described in detail above, and specific examples are applied to explain the principles and implementation modes of the application. The above example is only used to help understand the method and core idea of the application, including the best mode, and also enables any person skilled in the art to practice the application, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make some improvements and modifications to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application. The scope of the patent protection of the application is defined by the claims, and can include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the language expression of the claims, or if they include equivalent structural elements that are not substantially different from the language expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A low temperature corrosion protective coating, characterized in that, The raw materials include a first component and a second component; The first component includes, in terms of raw material mass parts: a modified elastic polyurethane resin 100 parts by weight; a surface-treated anticorrosive filler 7-15 parts by weight; a surface-treated weather-resistant filler 10-15 parts by weight; a wetting dispersant 1.0-1.8 parts by weight; a leveling agent 1.0-1.8 parts by weight; an organic solvent 15-25 parts by weight; The second component includes an isocyanate curing agent; The molar ratio of -OH in the first component to -NCO in the second component is 1: (1.0-1.2); The surface-treated anticorrosive filler includes a polyisocyanate surface-coated anticorrosive filler containing a perfluoroalkyl chain segment; The anticorrosive filler includes zinc phosphate, strontium chromate, mica powder and talc powder; The surface-treated weather-resistant filler includes a polyisocyanate surface-coated weather-resistant filler containing a perfluoroalkyl chain segment; The weather-resistant filler includes rutile titanium dioxide, hollow glass microbeads and silicone resin microspheres.

2. The corrosion protection coating according to claim 1, characterized in that The first component includes, in terms of raw material mass parts: a modified elastic polyurethane resin 100 parts by weight; a surface-treated anticorrosive filler 10-12 parts by weight; a surface-treated weather-resistant filler 12-14 parts by weight; a wetting dispersant 1.3-1.6 parts by weight; a leveling agent 1.3-1.5 parts by weight; an organic solvent 18-22 parts by weight; The molar ratio of -OH in the first component to -NCO in the second component is 1: (1.0-1.1).

3. The corrosion protection coating of claim 1, wherein, The modified elastic polyurethane resin includes a low-surface-energy modified elastic polyurethane resin; The anticorrosive coating is a thin-layer anticorrosive coating; The coating thickness of the anticorrosive coating is 180-220 μm.

4. The corrosion protection coating of claim 3, wherein, The surface coating is performed by using a surface coating treatment agent prepared from a polyisocyanate containing a perfluoroalkyl chain segment and a solvent; The mass content of the polyisocyanate containing a perfluoroalkyl chain segment in the surface coating treatment agent is 16%-20%; The solvent includes one or more of an aromatic solvent, an ester solvent and an ether ester solvent; A dispersing aid is further added in the surface coating process; The anticorrosive coating is a low-temperature anticorrosive coating.

5. The corrosion protection coating of claim 3, wherein, The coating layer thickness of the surface coating is 10-50 nm; The mass ratio of the polyisocyanate containing a perfluoroalkyl chain segment to the anticorrosive filler is (0.2-0.4):1000; The mass ratio of the polyisocyanate containing a perfluoroalkyl chain segment to the weather-resistant filler is (0.2-0.4):1000.

6. The corrosion protection coating of claim 1, wherein, The tensile strength of the coating of the anticorrosive coating at -70°C is greater than or equal to 12 MPa; The elongation at break of the coating of the anticorrosive coating at -70°C is greater than or equal to 10%; The anticorrosive coating is an impact-resistant anticorrosive coating.

7. The corrosion protection coating of claim 1, wherein, The mass ratio of the zinc phosphate, the strontium chromate, the mica powder and the talc powder is (1.5-2.0):(1.5-2.0):1:1; The mass ratio of the rutile titanium dioxide, the hollow glass microbeads and the silicone resin microspheres is (1.5-2.0):1:1; The particle size of the hollow glass microbeads is 20-30 μm; The particle size of the silicone resin microspheres is 6-8 μm.

8. The corrosion protection coating of claim 1, wherein, The wetting dispersant comprises polysiloxane containing pigment affinity groups; The leveling agent comprises silicone polyether copolymer; The organic solvent comprises one or more of aromatic solvents, ester solvents and ether ester solvents; The B component comprises a trimer of aliphatic isocyanate.

9. A method for producing the anticorrosive coating as claimed in any one of claims 1 to 8, characterized by, The method comprises the following steps: 1) mixing the modified elastic polyurethane resin, the surface-treated anticorrosive filler, the surface-treated weather-resistant filler, the wetting dispersant and the organic solvent, grinding to a fineness of 20-30 μm, adding the leveling agent, mixing again, to obtain the A component; Mixing the A component with the B component, to obtain the anticorrosive coating.

10. Use of the anticorrosive coating according to any one of claims 1-8 or the anticorrosive coating prepared by the preparation method of claim 9 on a ship body.

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