A long-life wind power tower surface coating and surface treatment method

Abstract

The invention discloses a long-life wind power tower surface coating, the surface coating is composed of epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polysiloxane topcoat; the epoxy zinc-rich primer is obtained by two-component compounding, the first component of which is composed of epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent, and the second component is composed of a polyamide curing agent and a solvent, and the mass ratio of the first component to the second component is 90-95:5-10. The long-life wind power tower surface coating of the invention solves the problem that the wind power tower surface coating has a short protective life and cannot meet the durable performance requirements of the wind power tower under long-term harsh conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine towers, and in particular to a long-life wind turbine tower surface coating and a surface treatment method. Background Art

[0002] Wind turbine tower is an important supporting structure in wind power system. The bottom of the tower is fixed on the foundation, and the top is connected to the wind turbine generator set, which plays the main role of supporting and bearing the load. Since wind turbine towers are built outdoors, they need to face long-term wind and rain erosion and corrosion damage from the external environment. This requires wind turbine towers to have extremely high corrosion resistance and weather resistance to maintain a long service life, especially in some plateaus, offshore, and areas with poor natural environment, where higher weather resistance performance is required for wind turbine towers.

[0003] At present, the most commonly used coating system is epoxy zinc-rich primer / epoxy micaceous iron intermediate paint / acrylic polyurethane topcoat, but the service life is only 5 to 10 years. After the service life, the acrylic polyurethane topcoat will be damaged, and the protective performance will decrease or even disappear. The use of polysiloxane topcoat can improve the protective performance of wind turbine towers, but its compatibility with existing epoxy zinc-rich primers and epoxy micaceous iron intermediate paints needs to be improved. Local defects are prone to occur at the interface of each paint film, resulting in a decrease in the protective performance of the overall surface coating, especially because a high content of zinc powder is added to the epoxy zinc-rich primer, and a certain amount of gray micaceous iron oxide is added to the epoxy micaceous iron intermediate paint, which reduces the bonding and compatibility with the polysiloxane topcoat, making the surface coating protection effect of the wind turbine tower still unable to meet the performance requirements of long-term use under harsh conditions. Summary of the invention

[0004] In view of the above shortcomings of the prior art, one aspect of the present invention is to provide a long-life wind turbine tower surface coating to solve the problem that the wind turbine tower surface coating has a short protective life and cannot meet the durable performance requirements of the wind turbine tower under long-term harsh conditions.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A long-life wind power tower surface coating, the surface coating is composed of an epoxy zinc-rich primer, an epoxy micaceous iron intermediate paint and a polysiloxane topcoat; the epoxy zinc-rich primer is obtained by a two-component compound, the first component of which is composed of an epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent, and the second component is composed of a polyamide curing agent and a solvent, and the mass ratio of the first component to the second component is 90-95:5-10.

[0007] As a preferred technical solution, the first additive is a metal organic framework material obtained by solvent thermal reaction of zinc nitrate, benzo[1,2-b:3,4-b':5,6-b']terthiophene-2,5,8-tricarboxylic acid and 2,5-bis(4-pyridyl)aniline.

[0008] The metal organic framework of the present invention first uses benzo[1,2-b:3,4-b':5,6-b']terthiophene-2,5,8-tricarboxylic acid as a ligand, and forms a two-dimensional layer with metal zinc ions through ion bridging, and then is further supported by 2,5-bis(4-pyridyl)aniline ligands to form a three-dimensional network, and reacts to form an organic-inorganic hybrid metal organic framework material with intrinsic conductivity. Using this as an additive, its organic component can improve the compatibility with epoxy resin, and the inorganic metal zinc ion can improve the binding force with zinc powder, thereby making the high content of zinc powder uniformly dispersed in the epoxy resin. Through the organic-inorganic hybrid metal organic framework material with intrinsic conductivity, the conductivity of the entire epoxy zinc-rich primer is further improved, thereby improving the protective effect of zinc powder on the metal wind turbine tower, and extending the service life of the wind turbine tower.

[0009] As a preferred technical solution, the mass ratio of the epoxy resin, zinc powder, the first additive, the auxiliary agent and the solvent is 10-15:70-75:5-8:3-5:7-11.

[0010] As a preferred technical solution, the first auxiliary agent is at least one of a defoaming agent, an anti-settling agent, a thickener, and a leveling agent.

[0011] As a preferred technical solution, the epoxy micaceous iron intermediate paint is obtained by a two-component compound, wherein the first component consists of epoxy resin, gray micaceous iron oxide, a second additive, a second auxiliary agent and a second solvent, and the second component consists of a polyamide curing agent and a solvent, and the mass ratio of the first component to the second component is 90-95:5-10.

[0012] As a preferred technical solution, the mass ratio of the epoxy resin, gray mica iron oxide, the second additive, the second auxiliary agent and the second solvent is 20-22:25-30:15-20:3-7:30-40.

[0013] As a preferred technical solution, the second additive consists of the first additive and POSS modified gray mica iron oxide.

[0014] As a preferred technical solution, the modification method of the POSS-modified gray mica iron oxide is as follows: the gray mica iron oxide is ultrasonically dispersed in an aqueous solution of isopropanol, a certain amount of tetramethylammonium hydroxide is added, and after stirring and mixing evenly, a xylene mixed solution of epoxytrimethoxysilane or epoxytriethoxysilane is added dropwise, and the mixture is heated to 80-90° C., and a hydrolysis reaction is performed for 6-8 hours to obtain the POSS-modified gray mica iron oxide. Epoxy POSS (i.e., epoxy cage-type polysilsesquioxane) can be obtained through the hydrolysis reaction of epoxytrimethoxysilane or epoxytriethoxysilane.

[0015] As a preferred technical solution, the epoxytrimethoxysilane is 3-(2,3-epoxypropyloxy)propyltrimethoxysilane and / or 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane; the epoxytriethoxysilane is 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane and / or 5,6-epoxyhexyltriethoxysilane.

[0016] The present invention not only takes into account the excellent performance unique to POSS by modifying the gray mica iron oxide with POSS, but also makes the iron oxide uniformly dispersed in the intermediate paint, further improving the protective effect of the wind turbine tower; the epoxy-based POSS helps to further improve the binding force and compatibility with the epoxy resin. In addition, it not only has excellent binding force with the primer, but also has excellent compatibility and binding force with the polysiloxane topcoat of the present invention, so that the overall protective performance of the surface coating of the wind turbine tower of the present invention is improved to extend the service life of the wind turbine tower. Furthermore, the second additive of the present invention is also compounded with a small amount of the first additive, which cooperates with the epoxy resin in the epoxy mica iron intermediate paint and the epoxy group carried by the POSS-modified gray mica iron oxide to further ensure that the zinc powder at the interface of the epoxy mica iron intermediate paint and the epoxy zinc-rich primer has excellent binding force and compatibility, thereby ensuring that the wind turbine tower has the performance characteristics of a longer service life.

[0017] Another aspect of the present invention is to provide a surface treatment method for a long-life wind turbine tower, the surface treatment method comprising the following steps:

[0018] S1: Spray cleaning agent on the tower surface for cleaning, and then use sandblasting to completely remove the oxidized rust layer and old coating to expose the tower metal base material;

[0019] S2: Compounding epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent into a first component, mixing a polyamide curing agent and a solvent into a second component, uniformly mixing the first component and the second component, spraying the mixture on the surface of the tower treated in step S1, controlling the film thickness to reach 90 μm ± 10 μm, and curing at room temperature for 20 to 24 hours to obtain an epoxy zinc-rich primer;

[0020] S3: Compounding epoxy resin, gray mica iron oxide, a second additive, a second auxiliary agent and a second solvent into a first component, mixing a polyamide curing agent and a solvent into a second component, uniformly mixing the first component and the second component, spraying the mixture onto the epoxy zinc-rich primer obtained in step S2, controlling the film thickness to reach 120 to 150 μm, and curing at room temperature for 20 to 24 hours to obtain an epoxy micaceous iron intermediate paint;

[0021] S4: spraying polysiloxane topcoat on the epoxy micaceous iron intermediate paint obtained in step S3, controlling the paint film thickness to reach 80-120 μm, and placing at room temperature for 3 days to obtain the wind turbine tower surface coating as described above.

[0022] Beneficial effects of the present invention:

[0023] The long-life wind turbine tower surface coating of the present invention is composed of an epoxy zinc-rich primer, an epoxy micaceous iron intermediate paint and a polysiloxane topcoat; by modifying the existing epoxy zinc-rich primer and the epoxy micaceous iron intermediate paint, the overall protective effect of the wind turbine tower is improved and its service life in harsh environmental conditions is extended. DETAILED DESCRIPTION

[0024] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0025] Example 1

[0026] The long-life wind power tower surface coating of this embodiment is composed of epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polysiloxane topcoat; the epoxy zinc-rich primer is obtained by two-component compounding, the first component of which is composed of epoxy resin, zinc powder, first additive, first auxiliary agent and first solvent in a mass ratio of 10:70:8:5:7, the second component is composed of polyamide curing agent and solvent xylene in a mass ratio of 70:30, and the mass ratio of the first component to the second component is 90:10. The epoxy value of the epoxy resin is 0.52, and the average particle size of the zinc powder is 8μm, the same below.

[0027] The first additive is a metal organic framework material obtained by solvent thermal reaction of zinc nitrate, benzo[1,2-b:3,4-b':5,6-b']trithiophene-2,5,8-tricarboxylic acid (CAS:1174223-25-6) and 2,5-bis(4-pyridyl)aniline. Specifically, a zinc nitrate aqueous solution with a mass concentration of 25% is first prepared, and then a mixed solution of benzo[1,2-b:3,4-b':5,6-b']trithiophene-2,5,8-tricarboxylic acid in N,N-diethylformamide (the mass concentration of benzo[1,2-b:3,4-b':5,6-b']trithiophene-2,5,8-tricarboxylic acid is 12%) is added, and the mixture is stirred and mixed evenly to control the concentration of zinc nitrate and benzo[1,2-b:3,4-b':5,6-b']trithiophene-2,5,8-tricarboxylic acid. The molar ratio is 5:2, heated to 80°C for reaction for 24 hours, and then a mixed solution of 2,5-bis(4-pyridyl)aniline and N,N-diethylformamide (the mass concentration of 2,5-bis(4-pyridyl)aniline is 30%) is added, and the molar ratio of 2,5-bis(4-pyridyl)aniline to benzo[1,2-b:3,4-b':5,6-b']terthiophene-2,5,8-tricarboxylic acid is controlled to be 1:1, and the temperature is raised to 95°C, and the reaction is continued for 48 hours to produce yellow cubic crystals, thereby obtaining the first additive.

[0028] The first auxiliary agent is composed of a defoamer (polydimethylsiloxane), an anti-settling agent (polyamide wax anti-settling agent 6900), a thickener (methyl hydroxyethyl cellulose) and a leveling agent (BYK-354) in a mass ratio of 2:3:2:5.

[0029] The first solvent consists of xylene and hexane in a mass ratio of 1:1.

[0030] The epoxy micaceous iron intermediate paint is a two-component compound, wherein the first component is composed of epoxy resin, gray micaceous iron oxide, a second additive, a second auxiliary agent, and a second solvent in a mass ratio of 20:25:15:3:37, and the second component is composed of a polyamide curing agent and a solvent xylene in a mass ratio of 68:32, and the mass ratio of the first component to the second component is 90:10. The epoxy value of the epoxy resin is 0.44, and the average particle size of the gray micaceous iron oxide is 5 μm, the same below.

[0031] The second additive is composed of the first additive and POSS modified gray mica iron oxide in a ratio of 15:85.

[0032] The modification method of the POSS-modified gray mica iron oxide is as follows: ultrasonically disperse gray mica iron oxide (10 parts by weight) in an aqueous solution (200 parts by volume) of isopropanol with a volume concentration of 40%, add 4 parts by weight of tetramethylammonium hydroxide, stir and mix evenly, then dropwise add 30 parts by weight of a xylene mixed solution of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (the mass proportion of 3-(2,3-epoxypropoxy)propyltrimethoxysilane is 16%), heat to 80° C., and perform a hydrolysis reaction for 8 hours to obtain the POSS-modified gray mica iron oxide.

[0033] The second auxiliary agent is composed of a defoamer (polydimethylsiloxane) and a thickener (organic bentonite) in a mass ratio of 1:3.

[0034] The second solvent consists of xylene and methyl acetate in a mass ratio of 3:2.

[0035] The polysiloxane topcoat adopts DreamDur 560SZ polysiloxane topcoat produced by Hunan Mengneng Technology Co., Ltd.

[0036] The surface treatment method of the long-life wind power tower in this embodiment comprises the following steps:

[0037] S1: Spray cleaning agent on the tower surface for cleaning, and then use sandblasting to completely remove the oxidized rust layer and old coating to expose the tower metal base material;

[0038] S2: In parts by weight, epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 10:70:8:5:7 are compounded into a first component, and a polyamide curing agent and a solvent in a mass ratio of 70:30 are mixed into a second component, and the first component and the second component are evenly mixed and sprayed on the surface of the tower treated in step S1, and the paint film thickness is controlled to reach 100 μm. After curing at room temperature for 24 hours, an epoxy zinc-rich primer is obtained;

[0039] S3: by weight, epoxy resin, gray mica iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 20:25:15:3:37 are compounded into a first component, a polyamide curing agent and a solvent in a mass ratio of 68:32 are mixed into a second component, the first component and the second component are evenly mixed and sprayed on the epoxy zinc-rich primer obtained in step S2, the film thickness is controlled to reach 120 μm, and the epoxy mica iron intermediate paint is obtained after curing at room temperature for 20 hours;

[0040] S4: airlessly spraying the polysiloxane topcoat on the epoxy micaceous iron intermediate paint obtained in step S3, controlling the paint film thickness to reach 80 μm, and placing it at room temperature for 3 days to obtain the wind turbine tower surface coating as described above.

[0041] Example 2

[0042] The long-life wind turbine tower surface coating of this embodiment is composed of epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polysiloxane topcoat; the epoxy zinc-rich primer is a two-component compound, the first component of which is composed of epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 12:72:6:3:7, the second component is composed of a polyamide curing agent and solvent xylene in a mass ratio of 73:27, and the mass ratio of the first component to the second component is 92:8.

[0043] The epoxy micaceous iron intermediate paint is obtained by compounding two components, wherein the first component consists of epoxy resin, gray micaceous iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 21:27:18:4:30, and the second component consists of a polyamide curing agent and solvent xylene in a mass ratio of 70:30. The mass ratio of the first component to the second component is 92:8.

[0044] The second additive is composed of the first additive and POSS modified gray mica iron oxide in a ratio of 12:88.

[0045] The modification method of the POSS-modified gray mica iron oxide is as follows: ultrasonically disperse gray mica iron oxide (10 parts by weight) in an aqueous solution (200 parts by volume) of isopropanol with a volume concentration of 40%, add 4 parts by weight of tetramethylammonium hydroxide, stir and mix evenly, then dropwise add 30 parts by weight of a xylene mixed solution of 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane (the mass proportion of 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane is 16%), heat to 85° C., and perform a hydrolysis reaction for 7 hours to obtain the POSS-modified gray mica iron oxide.

[0046] The first additive, the first auxiliary agent and the first solvent of this embodiment are the same as those of Embodiment 1.

[0047] The second auxiliary agent and the second solvent of this embodiment are the same as those of Embodiment 1.

[0048] The polysiloxane topcoat of this embodiment is the same as that of Example 1.

[0049] The surface treatment method of the long-life wind power tower in this embodiment comprises the following steps:

[0050] S1: Spray cleaning agent on the tower surface for cleaning, and then use sandblasting to completely remove the oxidized rust layer and old coating to expose the tower metal base material;

[0051] S2: In parts by weight, epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 12:72:6:3:7 are compounded into a first component, and a polyamide curing agent and a solvent in a mass ratio of 73:27 are mixed into a second component, and the first component and the second component are evenly mixed and sprayed on the surface of the tower treated in step S1, and the paint film thickness is controlled to reach 80 μm. After curing at room temperature for 20 hours, an epoxy zinc-rich primer is obtained;

[0052] S3: In parts by weight, epoxy resin, gray mica iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 21:27:18:4:30 are compounded into a first component, and a polyamide curing agent and a solvent in a mass ratio of 70:30 are mixed into a second component, and the first component and the second component are evenly mixed and sprayed on the epoxy zinc-rich primer obtained in step S2, and the film thickness is controlled to reach 120 μm, and the epoxy mica iron intermediate paint is obtained after curing at room temperature for 20 hours;

[0053] S4: airlessly spraying the polysiloxane topcoat on the epoxy micaceous iron intermediate paint obtained in step S3, controlling the paint film thickness to reach 100 μm, and placing it at room temperature for 3 days to obtain the wind turbine tower surface coating as described above.

[0054] Example 3

[0055] The long-life wind turbine tower surface coating of this embodiment is composed of epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polysiloxane topcoat; the epoxy zinc-rich primer is a two-component compound, the first component of which is composed of epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 13:70:5:3:9, the second component is composed of a polyamide curing agent and solvent xylene in a mass ratio of 75:25, and the mass ratio of the first component to the second component is 95:5.

[0056] The epoxy micaceous iron intermediate paint is obtained by compounding two components, wherein the first component consists of epoxy resin, gray micaceous iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 22:28:15:5:35, and the second component consists of a polyamide curing agent and solvent xylene in a mass ratio of 72:28. The mass ratio of the first component to the second component is 95:5.

[0057] The second additive is composed of the first additive and POSS modified gray mica iron oxide in a ratio of 15:85.

[0058] The modification method of the POSS-modified gray mica iron oxide is as follows: ultrasonically disperse gray mica iron oxide (10 parts by weight) in an aqueous solution (200 parts by volume) of isopropanol with a volume concentration of 40%, add 4 parts by weight of tetramethylammonium hydroxide, stir and mix evenly, then dropwise add 30 parts by weight of a xylene mixed solution of 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane (the mass proportion of 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane is 16%), heat to 90° C., and perform a hydrolysis reaction for 6 hours to obtain the POSS-modified gray mica iron oxide.

[0059] The first additive, the first auxiliary agent and the first solvent of this embodiment are the same as those of Embodiment 1.

[0060] The second auxiliary agent and the second solvent of this embodiment are the same as those of Embodiment 1.

[0061] The polysiloxane topcoat of this embodiment is the same as that of Example 1.

[0062] The surface treatment method of the long-life wind power tower in this embodiment comprises the following steps:

[0063] S1: Spray cleaning agent on the tower surface for cleaning, and then use sandblasting to completely remove the oxidized rust layer and old coating to expose the tower metal base material;

[0064] S2: In parts by weight, epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 13:70:5:3:9 are compounded into a first component, and a polyamide curing agent and a solvent in a mass ratio of 75:25 are mixed into a second component, and the first component and the second component are evenly mixed and sprayed on the surface of the tower treated in step S1, and the paint film thickness is controlled to reach 100 μm. After curing at room temperature for 24 hours, an epoxy zinc-rich primer is obtained;

[0065] S3: by weight, epoxy resin, gray mica iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 22:28:15:5:35 are compounded into a first component, a polyamide curing agent and a solvent in a mass ratio of 72:28 are mixed into a second component, the first component and the second component are evenly mixed and then sprayed on the epoxy zinc-rich primer obtained in step S2, the film thickness is controlled to reach 150 μm, and the epoxy micaceous iron intermediate paint is obtained after curing at room temperature for 24 hours;

[0066] S4: airlessly spraying the polysiloxane topcoat on the epoxy micaceous iron intermediate paint obtained in step S3, controlling the paint film thickness to reach 80 μm, and placing it at room temperature for 3 days to obtain the wind turbine tower surface coating as described above.

[0067] Example 4

[0068] The long-life wind turbine tower surface coating of this embodiment is composed of epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polysiloxane topcoat; the epoxy zinc-rich primer is a two-component compound, the first component of which is composed of epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 10:75:5:3:7, the second component is composed of a polyamide curing agent and solvent xylene in a mass ratio of 75:25, and the mass ratio of the first component to the second component is 95:5.

[0069] The epoxy micaceous iron intermediate paint is obtained by compounding two components, wherein the first component consists of epoxy resin, gray micaceous iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 20:30:15:5:30, and the second component consists of a polyamide curing agent and a solvent xylene in a mass ratio of 70:30. The mass ratio of the first component to the second component is 90:10.

[0070] The second additive is composed of the first additive and POSS modified gray mica iron oxide in a ratio of 10:90.

[0071] The modification method of the POSS-modified gray mica iron oxide is as follows: ultrasonically disperse gray mica iron oxide (10 parts by weight) in an aqueous solution (200 parts by volume) of isopropanol with a volume concentration of 40%, add 4 parts by weight of tetramethylammonium hydroxide, stir and mix evenly, then dropwise add 30 parts by weight of a xylene mixed solution of 5,6-epoxyhexyltriethoxysilane (the mass proportion of 5,6-epoxyhexyltriethoxysilane is 16%), heat to 90° C., and perform a hydrolysis reaction for 6 hours to obtain the POSS-modified gray mica iron oxide.

[0072] The first additive, the first auxiliary agent and the first solvent of this embodiment are the same as those of Embodiment 1.

[0073] The second auxiliary agent and the second solvent of this embodiment are the same as those of Embodiment 1.

[0074] The polysiloxane topcoat of this embodiment is the same as that of Example 1.

[0075] The surface treatment method of the long-life wind power tower in this embodiment comprises the following steps:

[0076] S1: Spray cleaning agent on the tower surface for cleaning, and then use sandblasting to completely remove the oxidized rust layer and old coating to expose the tower metal base material;

[0077] S2: In parts by weight, epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent in a mass ratio of 10:75:5:3:7 are compounded into a first component, and a polyamide curing agent and a solvent in a mass ratio of 75:25 are mixed into a second component, and the first component and the second component are evenly mixed and sprayed on the surface of the tower treated in step S1, and the paint film thickness is controlled to reach 90 μm. After curing at room temperature for 24 hours, an epoxy zinc-rich primer is obtained;

[0078] S3: by weight, epoxy resin, gray mica iron oxide, a second additive, a second auxiliary agent and a second solvent in a mass ratio of 20:30:15:5:30 are compounded into a first component, a polyamide curing agent and a solvent in a mass ratio of 70:30 are mixed into a second component, the first component and the second component are evenly mixed and then sprayed on the epoxy zinc-rich primer obtained in step S2, the film thickness is controlled to reach 130 μm, and the epoxy micaceous iron intermediate paint is obtained after curing at room temperature for 24 hours;

[0079] S4: airlessly spraying the polysiloxane topcoat on the epoxy micaceous iron intermediate paint obtained in step S3, controlling the paint film thickness to reach 80 μm, and placing it at room temperature for 3 days to obtain the wind turbine tower surface coating as described above.

[0080] The wind turbine tower surface coatings prepared in Examples 1 to 4 were subjected to performance tests, and the performance results are shown in Table 1:

[0081] Among them, acid mist resistance is tested according to GB / T 1771; 3% salt water resistance is tested according to GB / T 10834; adhesion is tested according to GB / T 5210; aging resistance is tested according to GB / T 1865.

[0082] Table 1

[0083] Example 1 Example 2 Example 3 Example 4 Salt spray resistance, h ≥3000 ≥3000 ≥3000 ≥3000 Resistance to 3% salt water, h ≥3000 ≥3000 ≥3000 ≥3000 Adhesion, MPa 14.1 14.2 14.5 14.4 Aging resistance, h ≥1000 ≥1000 ≥1000 ≥1000

[0084] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A long-life wind power tower surface coating, characterized in that: The surface coating is composed of an epoxy zinc-rich primer, an epoxy micaceous iron intermediate paint and a polysiloxane topcoat; the epoxy zinc-rich primer is obtained by a two-component compounding, wherein the first component is composed of an epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent, and the second component is composed of a polyamide curing agent and a solvent, and the mass ratio of the first component to the second component is 90-95:5-10; the first additive is a metal organic framework material obtained by a solvent thermal reaction of zinc nitrate, benzo[1,2-b:3,4-b':5,6-b']terthiophene-2,5,8-tricarboxylic acid and 2,5-bis(4-pyridyl)aniline; the epoxy micaceous iron intermediate paint is obtained by a two-component compounding, wherein the first component is composed of an epoxy resin, gray micaceous iron oxide, a second additive, a second auxiliary agent and a second solvent, and the second component is composed of a polyamide curing agent and a solvent, and the mass ratio of the first component to the second component is 90-95:5-10; The second additive consists of the first additive and POSS modified gray mica iron oxide.

2. The long-life wind power tower surface coating according to claim 1, characterized in that: The mass ratio of the epoxy resin, zinc powder, the first additive, the first auxiliary agent and the first solvent in the epoxy zinc-rich primer is 10-15:70-75:5-8:3-5:7-11.

3. The long-life wind power tower surface coating according to claim 1, characterized in that: The first auxiliary agent is at least one of a defoaming agent, an anti-settling agent, a thickener, and a leveling agent.

4. The long-life wind power tower surface coating according to claim 1, characterized in that: The mass ratio of the epoxy resin, the gray micaceous iron oxide, the second additive, the second auxiliary agent and the second solvent in the epoxy micaceous iron intermediate paint is 20-22:25-30:15-20:3-7:30-40.

5. The long-life wind power tower surface coating according to claim 1, characterized in that: The modification method of the POSS-modified gray mica iron oxide is as follows: ultrasonically dispersing the gray mica iron oxide in an aqueous solution of isopropanol, adding a certain amount of tetramethylammonium hydroxide, stirring and mixing evenly, dripping a xylene mixed solution of epoxytrimethoxysilane or epoxytriethoxysilane, heating to 80-90° C., and performing a hydrolysis reaction for 6-8 hours to obtain the POSS-modified gray mica iron oxide.

6. The long-life wind power tower surface coating according to claim 5, characterized in that: The epoxytrimethoxysilane is 3-(2,3-epoxypropyloxy)propyltrimethoxysilane and / or 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane; the epoxytriethoxysilane is 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane and / or 5,6-epoxyhexyltriethoxysilane.

7. A surface treatment method for a long-life wind power tower, characterized in that: The surface treatment method comprises the following steps: S1: Spray cleaning agent on the tower surface for cleaning, and then use sandblasting to completely remove the oxidized rust layer and old coating to expose the tower metal base material; S2: Compounding epoxy resin, zinc powder, a first additive, a first auxiliary agent and a first solvent into a first component, mixing a polyamide curing agent and a solvent into a second component, uniformly mixing the first component and the second component, spraying the mixture on the surface of the tower treated in step S1, controlling the film thickness to reach 90 μm ± 10 μm, and curing at room temperature for 20 to 24 hours to obtain an epoxy zinc-rich primer; S3: Compounding epoxy resin, gray mica iron oxide, a second additive, a second auxiliary agent and a second solvent into a first component, mixing a polyamide curing agent and a solvent into a second component, uniformly mixing the first component and the second component, spraying the mixture onto the epoxy zinc-rich primer obtained in step S2, controlling the film thickness to reach 120 to 150 μm, and curing at room temperature for 20 to 24 hours to obtain an epoxy micaceous iron intermediate paint; S4: spraying a polysiloxane topcoat on the epoxy micaceous iron intermediate paint obtained in step S3, controlling the paint film thickness to reach 80-120 μm, and placing at room temperature for 3 days to obtain the wind turbine tower surface coating as claimed in any one of claims 1 to 6.