A hydrophobic anti-icing wind power blade surface protective water-based paint and a preparation method thereof

Abstract

The application discloses a kind of hydrophobic anti-icing wind power blade surface protective water-based paint and preparation method thereof, including component A and component B, component A includes by weight parts: fluorine-containing silicon polyurethane resin 40-60 parts, poly (pyrrole) grafted cellulose nanocrystal 5-8 parts, water 15-20 parts, dispersing agent 0.5-3 parts, defoaming agent 0.1-0.5 parts, leveling agent 0.5-1 part, pigment and filler 10-15 parts, ultraviolet light absorber 2-5 parts;Component B includes isocyanate, polyether polyol and drier.The coating prepared by fluorine-containing silicon polyurethane resin has good adhesion with substrate, and the coating has good hydrophobicity at the same time;Poly (pyrrole) grafted cellulose nanocrystal material is introduced, which can increase the water contact angle of coating, thereby further increasing the hydrophobicity of coating to prevent icing of wind power blade;Poly (pyrrole) is a photo-thermal material, the coating has certain photo-thermal effect when there is sunlight, which can accelerate ice to water to assist deicing.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a hydrophobic anti-icing water-based coating for the surface protection of wind turbine blades and its preparation method. Background Technology

[0002] Wind is one of the pollution-free energy sources, and it is inexhaustible. For coastal islands, grassland pastoral areas, mountainous regions, and plateaus lacking water, fuel, and with inconvenient transportation, utilizing wind power in accordance with local conditions is highly suitable and has great potential. Offshore wind power is an important area of ​​renewable energy development, a vital force driving technological progress and industrial upgrading in wind power, and an important measure to promote energy structure adjustment. China has abundant offshore wind energy resources, and accelerating the construction of offshore wind power projects is of great significance for helping coastal areas control air pollution, adjust energy structure, and transform economic development patterns.

[0003] Wind power generation is typically located in coastal islands, grassland pastures, mountainous areas, deserts, and plateaus. In high-altitude and high-latitude regions, temperatures are extremely low, with sub-zero outdoor temperatures being very common. Wind turbine blades often become icy due to the accumulation of water droplets, which impairs the aerodynamic performance of the blade airfoil, increases turbine load, disrupts the turbine's dynamic balance, accelerates component fatigue, and reduces power generation efficiency. Therefore, anti-icing and de-icing have become critical technical challenges in the wind power industry. Surface coatings for anti-icing offer significant advantages in terms of applicability and construction costs; therefore, it is necessary to develop hydrophobic anti-icing protective coatings for wind turbine blades. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the primary objective of this invention is to provide a hydrophobic, anti-icing water-based coating for the surface protection of wind turbine blades.

[0005] Another objective of this invention is to provide a method for preparing the above-mentioned hydrophobic anti-icing wind turbine blade surface protective water-based coating.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A hydrophobic, anti-icing, water-based protective coating for wind turbine blades comprises component A and component B. Component A, by weight, comprises the following components: 40-60 parts of fluorinated silicone polyurethane resin, 5-8 parts of polypyrrole-grafted cellulose nanocrystals, 15-20 parts of water, 0.5-3 parts of dispersant, 0.1-0.5 parts of defoamer, 0.5-1 parts of leveling agent, 10-15 parts of pigments and fillers, and 2-5 parts of ultraviolet absorber.

[0008] The B component includes an isocyanate curing agent, a polyether polyol, and a drying agent, wherein the molar ratio of isocyanate groups to hydroxyl groups is (10-8):(2-3);

[0009] The weight ratio of component A to component B is 1:(0.5-1).

[0010] Further, the fluorosilicone polyurethane resin is prepared according to the following steps:

[0011] Based on the weight parts of the fluorinated diol, at room temperature, 10-20 parts by weight of the fluorinated diol, 10-30 parts by weight of the hydroxyl-terminated polydimethylsiloxane, 30-40 parts by weight of the polyether diol and 10-25 parts by weight of the isocyanate are added to a reaction vessel, heated to 60-90°C, and reacted for 3-5 hours. Then, 1-10 parts by weight of the chain extender are added, and the reaction is carried out for 2-4 hours to obtain the fluorinated silicone polyurethane resin.

[0012] Furthermore, the polypyrrole-grafted cellulose nanocrystals are prepared according to the following steps:

[0013] (1) Bromoalkanes and NaOH were added to N,N-dimethylformamide, and then pyrrole was added. After stirring at room temperature for 24 h, bromopyrrole was obtained by column chromatography.

[0014] (2) Cellulose nanocrystals were added to N,N-dimethylformamide, then bromopyrrole and NaOH were added. After reacting at room temperature for 20 h, the mixture was centrifuged and purified to obtain pyrrole-grafted cellulose nanocrystals.

[0015] (3) Pyrrole-grafted cellulose nanocrystals were dispersed in water to prepare a solution, and pyrrole and 0.1 mol / L Fe were added. 3+ An aqueous solution was added to the solution, and after reacting at room temperature for 6 hours, the pyrrole in the solution and the pyrrole on the surface of the cellulose nanocrystals were reacted in Fe... 3+ Polypyrrole was formed under catalytic oxidation, and the reaction solution was then filtered and dried to obtain the polypyrrole-grafted cellulose nanocrystals.

[0016] Furthermore, the pigment / filler is titanium dioxide.

[0017] In some embodiments of the present invention, the dispersant is at least one of BYK-180 (BYK, Germany), BYK-190 (BYK, Germany), Ucar 690w (Ucar Chemical), and SN5040 (Nopco, Japan), but is not limited thereto.

[0018] In some embodiments of the present invention, the defoamer is at least one of BYK-024 (BYK, Germany), Tego810 (Tego, Germany), Tego910w (Tego, Germany), Ucar 290w (Ucar Chemical), and Ucar 295w (Ucar Chemical), but is not limited thereto.

[0019] In some embodiments of the present invention, the leveling agent is at least one of BYK390 (BYK, Germany) and 3777 leveling agent (AFCONA), but is not limited thereto.

[0020] In some embodiments of the present invention, the ultraviolet light absorber is at least one of Tinuvin 400-DW (BASF, Germany), Tinuvin 123-DW (BASF, Germany), Chiguard 5400WB (Chiguard Technology), Chiguard 101WB (Chiguard Technology), and Light 951 (Yocar Chemical), but is not limited thereto.

[0021] Furthermore, the isocyanate curing agent is at least one of polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

[0022] Furthermore, the polyether polyol is at least one of polytetrahydrofuran diol, polycaprolactone diol, and polypropylene glycol.

[0023] Furthermore, the drying agent is at least one of dioctyltin dilaurate, dibutyltin dilaurate, and dibutyltin diacetate.

[0024] Furthermore, the drying agent accounts for 0.1-0.5 wt% of component B.

[0025] Furthermore, in the preparation of the fluorosilicone polyurethane resin, the number-average molecular weight of the fluorinated diol ranges from 1000 to 4000, and is selected from one or more of polychlorotrifluoroethylene glycol, polyvinyl fluoride glycol, polyvinylidene fluoride glycol, polyperfluoroethylene propylene glycol, ethylene-tetrafluoroethylene copolymer glycol, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer glycol, and ethylene-chlorotrifluoroethylene copolymer glycol.

[0026] Furthermore, in the preparation of the fluorosilicone polyurethane resin, the number-average molecular weight of the hydroxyl-terminated polydimethylsiloxane ranges from 1000 to 4000.

[0027] Furthermore, in the preparation of the fluorosilicone polyurethane resin, the number-average molecular weight of the polyether diol ranges from 1000 to 4000.

[0028] Furthermore, in the preparation of the fluorosilicone polyurethane resin, the isocyanate is selected from one or more of 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,5-naphthalene diisocyanate, phenylmethylene diisocyanate, tetramethylphenylmethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate.

[0029] Furthermore, in the preparation of the fluorosilicone polyurethane resin, the chain extender is selected from one or more of ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanediol, diethylene glycol, neopentyl glycol, and 1,6-hexanediol.

[0030] Furthermore, in the preparation of the polypyrrole-grafted cellulose nanocrystals, the bromoalkane is one or more of dibromomethane, 1,5-dibromopentane, 1,10-dibromodecane, 1,4-dibromobutane, and 1,12-dibromododecane.

[0031] Furthermore, in the preparation of the polypyrrole-grafted cellulose nanocrystals, the amount of NaOH used in step (1) is 50-80% of the mass of the bromoalkane, and the mass ratio of the bromoalkane to pyrrole is 8:1-4:3.

[0032] Furthermore, in the preparation of the polypyrrole-grafted cellulose nanocrystals, the amount of NaOH used in step (2) is 50-80% of the mass of bromopyrrole, and the mass ratio of bromopyrrole to cellulose nanocrystals is 5:2-4:3.

[0033] Furthermore, in the preparation of the polypyrrole-grafted cellulose nanocrystals, in step (3), the pyrrole-grafted cellulose nanocrystals are dispersed in water to prepare a 5-10 wt% solution, the added pyrrole concentration in the solution is 0.5-1.5 wt%, and 0.1 mol / L Fe... 3+ The amount of aqueous solution added is 10-15% of the solution volume.

[0034] The preparation method of the above-mentioned hydrophobic anti-icing wind turbine blade surface protective water-based coating includes the following steps:

[0035] S1. Fluorosilicone polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Subsequently, defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A.

[0036] S2. Add isocyanate curing agent, polyether polyol and drying agent to the reaction vessel, stir and react at 70-80℃ for 4-5 hours, and then cool to obtain component B;

[0037] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0038] It should be noted that the coating of the present invention can only be mixed with components A and B within 2 hours before construction, and can be used up to 4 hours after mixing; when mixing components A and B, a diluent can be added as needed for construction; during the production stage and storage and transportation, components A and B are packaged separately, and component B does not contain water.

[0039] The present invention has the following advantages and effects compared with the prior art:

[0040] (1) The coating prepared by the present invention using fluorinated silicone polyurethane resin has good adhesion to the substrate and at the same time makes the coating have good hydrophobicity. The inventors found that introducing polypyrrole-grafted cellulose nanocrystal material into the coating system can increase the water contact angle of the coating, thereby further increasing the hydrophobicity of the coating and preventing wind turbine blades from icing.

[0041] (2) The coating of the present invention incorporates polypyrrole-grafted cellulose nanocrystals. Polypyrrole is a photothermal material. When exposed to sunlight, the coating has a certain photothermal effect, which can accelerate the melting of ice into water and assist in de-icing.

[0042] (3) The coating prepared by the present invention can form a dense polymer network structure after curing. Strong hydrogen bonds can be formed between the hydroxyl groups on the polyester or polyether segments, the isocyanate groups and the hydroxyl groups carried by the cellulose nanocrystals, so that the coating has good adhesion and weather resistance. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 The results of water contact angle, adhesion and aging resistance tests of the coatings prepared for the examples and comparative examples are shown.

[0045] Figure 2 The results of salt spray resistance tests are shown for the coatings prepared in the examples and comparative examples. Detailed Implementation

[0046] The embodiments of the present invention will be clearly and completely described below with reference to the examples. These described embodiments are merely some, not all, of the embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] Unless otherwise specified, all reagents and instruments used in this invention are commercially available conventional products. For process parameters not specifically stated, conventional techniques can be followed.

[0048] The cellulose nanocrystals used in the embodiments and comparative examples of this invention were purchased from ScienceK.

[0049] The titanium dioxide used was R996, purchased from Shanghai Pengbo Titanium Dioxide Co., Ltd.

[0050] Example 1

[0051] This embodiment provides a hydrophobic, anti-icing, water-based protective coating for wind turbine blades, comprising component A and component B. Component A, by weight, comprises the following components: 50 parts of fluorosilicone polyurethane resin, 6 parts of polypyrrole-grafted cellulose nanocrystals, 15 parts of water, 1 part of BYK-180 dispersant, 0.2 parts of BYK-024 defoamer, 1 part of BYK390 leveling agent, 10 parts of titanium dioxide pigment and filler, and 2 parts of Tinuvin 400-DW ultraviolet absorber.

[0052] The B component includes polymethylene polyphenyl polyisocyanate, polytetrahydrofuran diol and drier dioctyltin dilaurate, wherein the molar ratio of isocyanate groups to hydroxyl groups is 5:1;

[0053] The weight ratio of component A to component B is 1:0.8.

[0054] The fluorosilicone polyurethane resin used in this embodiment was prepared according to the following steps:

[0055] At room temperature (25℃), 10 g of ethylene-trifluorochloroethylene copolymer diol (number average molecular weight 1000), 10 g of hydroxyl-terminated polydimethylsiloxane (number average molecular weight 1000), 30 g of polyether diol (number average molecular weight 1000), and 10 g of 2,4-toluene diisocyanate were added to a reaction vessel, heated to 60℃, and reacted for 3 hours. Then, 1 g of 1,4-butanediol was added, and the reaction was carried out for 2 hours. The product was then discharged to obtain fluorosilicone polyurethane resin.

[0056] The above-mentioned method for preparing fluorinated silicone polyurethane resin has been disclosed in Chinese patent CN102746782B.

[0057] The polypyrrole-grafted cellulose nanocrystals used in this embodiment were prepared according to the following steps:

[0058] (1) Add 10g of 1,5-dibromopentane and 5g of NaOH to N,N-dimethylformamide, then add 5g of pyrrole, stir the reaction at room temperature for 24h, and then purify by column chromatography to obtain bromopyrrole;

[0059] (2) Take 0.5g of cellulose nanocrystals and add them to N,N-dimethylformamide, then add 1g of bromopyrrole and 0.5g of NaOH. After reacting at room temperature for 20h, centrifuge and purify to obtain pyrrole-grafted cellulose nanocrystals.

[0060] (3) Pyrrole-grafted cellulose nanocrystals were dispersed in water to prepare a 5wt% solution. 0.5g of pyrrole and 20mL of 0.1mol / L Fe were then added. 3+ An aqueous solution was added to the solution, and after reacting at room temperature for 6 hours, the pyrrole in the solution and the pyrrole on the surface of the cellulose nanocrystals were reacted in Fe... 3+ Polypyrrole was formed under catalytic oxidation, and the reaction solution was then filtered and dried to obtain the polypyrrole-grafted cellulose nanocrystals.

[0061] The hydrophobic, anti-icing, water-based protective coating for wind turbine blades in this embodiment is prepared according to the following steps:

[0062] S1. Fluorosilicone polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Subsequently, defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A.

[0063] S2. Add polymethylene polyphenyl polyisocyanate, polytetrahydrofuran diol and drier dioctyltin dilaurate into a reaction vessel, stir and react at 70°C for 5 hours, and then cool to obtain component B.

[0064] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0065] Example 2

[0066] This embodiment provides a hydrophobic, anti-icing, water-based protective coating for wind turbine blades, comprising component A and component B. Component A, by weight, comprises the following components: 60 parts of fluorosilicone polyurethane resin, 6 parts of polypyrrole-grafted cellulose nanocrystals, 15 parts of water, 2 parts of BYK-190 dispersant, 0.5 parts of Tego810 defoamer, 1 part of 3777 leveling agent, 15 parts of titanium dioxide pigment and filler, and 4 parts of Tinuvin 123-DW ultraviolet absorber.

[0067] The B component includes isophorone diisocyanate, polytetrahydrofuran diol and drier dibutyltin diacetate, wherein the molar ratio of isocyanate groups to hydroxyl groups is 4:1;

[0068] The weight ratio of component A to component B is 1:1.

[0069] The fluorinated silicone polyurethane resin used in this embodiment was prepared in the same manner as in Example 1.

[0070] The preparation of the polypyrrole-grafted cellulose nanocrystals used in this embodiment is the same as in Example 1.

[0071] The hydrophobic, anti-icing, water-based protective coating for wind turbine blades in this embodiment is prepared according to the following steps:

[0072] S1. Fluorosilicone polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Subsequently, defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A.

[0073] S2. Isophorone diisocyanate, polytetrahydrofurandiol and drier dibutyltin diacetate were added to the reaction vessel, stirred at 80°C for 4 hours and then cooled to obtain component B.

[0074] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0075] Example 3

[0076] This embodiment provides a hydrophobic, anti-icing, water-based protective coating for wind turbine blades, comprising component A and component B. Component A, by weight, comprises the following components: 55 parts of fluorosilicone polyurethane resin, 8 parts of polypyrrole-grafted cellulose nanocrystals, 20 parts of water, 1 part of Ucar 690w dispersant, 0.2 parts of Ucar 290w defoamer, 0.5 parts of 3777 leveling agent, 15 parts of titanium dioxide pigment and filler, and 3 parts of Chiguard 5400WB ultraviolet absorber.

[0077] The B component includes hexamethylene diisocyanate, polycaprolactone diol and drier dioctyltin dilaurate, wherein the molar ratio of isocyanate groups to hydroxyl groups is 4:1;

[0078] The weight ratio of component A to component B is 1:0.6.

[0079] The fluorinated silicone polyurethane resin used in this embodiment was prepared in the same manner as in Example 1.

[0080] The preparation of the polypyrrole-grafted cellulose nanocrystals used in this embodiment is the same as in Example 1.

[0081] The hydrophobic, anti-icing, water-based protective coating for wind turbine blades in this embodiment is prepared according to the following steps:

[0082] S1. Fluorosilicone polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Subsequently, defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A.

[0083] S2. Hexamethylene diisocyanate, polycaprolactone diol and drier dioctyltin dilaurate are added to a reaction vessel, stirred at 80°C for 4 hours and then cooled to obtain component B.

[0084] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0085] Example 4

[0086] This embodiment provides a hydrophobic, anti-icing, water-based protective coating for wind turbine blades, comprising component A and component B. Component A, by weight, comprises the following components: 45 parts of fluorosilicone polyurethane resin, 5 parts of polypyrrole-grafted cellulose nanocrystals, 20 parts of water, 0.5 parts of SN5040 dispersant, 0.1 parts of Eucalyptus 295w defoamer, 0.5 parts of BYK390 leveling agent, 10 parts of titanium dioxide pigment and filler, and 4 parts of Light 951 ultraviolet absorber.

[0087] The B component includes isophorone diisocyanate, polypropylene glycol and drier dibutyltin dilaurate, wherein the molar ratio of isocyanate groups to hydroxyl groups is 5:2.

[0088] The weight ratio of component A to component B is 1:0.5.

[0089] The fluorinated silicone polyurethane resin used in this embodiment was prepared in the same manner as in Example 1.

[0090] The preparation of the polypyrrole-grafted cellulose nanocrystals used in this embodiment is the same as in Example 1.

[0091] The hydrophobic, anti-icing, water-based protective coating for wind turbine blades in this embodiment is prepared according to the following steps:

[0092] S1. Fluorosilicone polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Subsequently, defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A.

[0093] S2. Isophorone diisocyanate, polypropylene glycol and drier dibutyltin dilaurate are added to a reaction vessel, stirred at 70°C for 5 hours and then cooled to obtain component B.

[0094] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0095] Comparative Example 1

[0096] This comparative example provides a coating comprising component A and component B, wherein component A comprises the following components by weight: 50 parts of polyurethane resin (Sigma-Aldrich (Shanghai) Trading Co., Ltd., product number: GF20677923), 6 parts of polypyrrole grafted cellulose nanocrystals, 15 parts of water, 1 part of BYK-180 dispersant, 0.2 parts of BYK-024 defoamer, 1 part of BYK390 leveling agent, 10 parts of titanium dioxide pigment and filler, and 2 parts of Tinuvin 400-DW ultraviolet absorber;

[0097] The B component includes polymethylene polyphenyl polyisocyanate, polytetrahydrofuran diol and drier dioctyltin dilaurate, wherein the molar ratio of isocyanate groups to hydroxyl groups is 5:1;

[0098] The weight ratio of component A to component B is 1:0.8.

[0099] The preparation of the polypyrrole-grafted cellulose nanocrystals used in this comparative example is the same as in Example 1.

[0100] This comparative example coating was prepared according to the following steps:

[0101] S1. Polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Then defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A.

[0102] S2. Add polymethylene polyphenyl polyisocyanate, polytetrahydrofuran diol and drier dioctyltin dilaurate into a reaction vessel, stir and react at 70°C for 5 hours, and then cool to obtain component B.

[0103] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0104] The difference between this comparative example and Example 1 is that the fluorosilicone polyurethane resin is replaced with a commercially available polyurethane resin.

[0105] Comparative Example 2

[0106] This comparative example provides a coating comprising component A and component B, wherein component A comprises the following components by weight: 50 parts of fluorosilicone polyurethane resin, 15 parts of water, 1 part of BYK-180 dispersant, 0.2 parts of BYK-024 defoamer, 1 part of BYK390 leveling agent, 10 parts of titanium dioxide pigment and filler, and 2 parts of Tinuvin 400-DW ultraviolet absorber;

[0107] The B component includes polymethylene polyphenyl polyisocyanate, polytetrahydrofuran diol and drier dioctyltin dilaurate, wherein the molar ratio of isocyanate groups to hydroxyl groups is 5:1;

[0108] The weight ratio of component A to component B is 1:0.8.

[0109] The fluorinated silicone polyurethane resin used in this comparative example was prepared in the same manner as in Example 1.

[0110] This comparative example coating was prepared according to the following steps:

[0111] S1. Fluorosilicone polyurethane resin, water, dispersant, pigments and fillers are mixed evenly and then ground. Defoamer, leveling agent and ultraviolet light absorber are then added and mixed evenly to obtain component A.

[0112] S2. Add polymethylene polyphenyl polyisocyanate, polytetrahydrofuran diol and drier dioctyltin dilaurate into a reaction vessel, stir and react at 70°C for 5 hours, and then cool to obtain component B.

[0113] S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

[0114] The difference between this comparative example and Example 1 is that component A does not contain polypyrrole-grafted cellulose nanocrystals.

[0115] Performance testing

[0116] To further demonstrate the effectiveness of the present invention, the coatings prepared in the above embodiments and comparative examples were subjected to the following tests:

[0117] 1. Water contact angle test

[0118] The water contact angle test was conducted according to GB / T 23764-2009. After mixing components A and B evenly according to the mass formula ratio to prepare the coating, it was immediately applied to a glass slide measuring 76.2×25.4×(1-1.2) mm, with a coating thickness of 100 μm. After curing the coated sample at (23±2)℃ for 7 days, the water contact angle was measured at 5 points on the paint film surface using a contact angle meter. Distilled water droplets were used in the test, with a droplet volume of 5 μL. The test results are as follows: Figure 1 As shown.

[0119] 2. Adhesion test

[0120] The coating was applied to the surface of wind turbine blades of the same material and specifications, with a thickness of 100 μm. After drying and curing, test panels were prepared. Following the specifications in ASTM D3359, 25 grids were drawn on the coated surface using a 2 mm cross-cutting tool 72 hours after coating. The coating was then tested using 3M tape: 5B was the best, and 0B the worst; 5B indicates an intact coating. Rating criteria: 4B < 5% coating damage; 3B 5-15% coating damage; 2B 15-35% coating damage; 1B 35-55% coating damage; 0B > 55% coating damage. The rating results are as follows: Figure 1 As shown.

[0121] 3. Aging resistance test

[0122] The coating was applied to a 10mm thick glass fiber reinforced plastic board, with a coating thickness of 100μm. It was then dried and cured at 25℃ and 55% humidity to form a test panel. The UVB-313 test for resistance to accelerated aging was conducted according to GB / T14522-1993, "Artificial Climate Accelerated Test Methods for Plastics, Coatings and Rubber Materials for Mechanical Industry Products". The test results are as follows: Figure 1 As shown.

[0123] 4. Salt spray resistance test

[0124] The coating was applied to a 75*150*10mm fiberglass plate with a thickness of 100μm. Salt spray resistance was tested according to GB / T1771-2007 "Determination of Neutral Salt Spray Resistance of Paints and Varnishes". The test results are as follows. Figure 2 As shown.

[0125] Depend on Figure 1 and Figure 2 The test results show that the coating prepared by the present invention has excellent adhesion and a large water contact angle, has hydrophobic and anti-icing properties, and also has good aging resistance and salt spray resistance.

[0126] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A hydrophobic, anti-icing, water-based protective coating for wind turbine blades, characterized in that, It includes component A and component B, wherein component A comprises the following components by weight: 40-60 parts of fluorinated silicone polyurethane resin, 5-8 parts of polypyrrole grafted cellulose nanocrystals, 15-20 parts of water, 0.5-3 parts of dispersant, 0.1-0.5 parts of defoamer, 0.5-1 parts of leveling agent, 10-15 parts of pigments and fillers, and 2-5 parts of ultraviolet light absorber; The B component includes an isocyanate curing agent, a polyether polyol, and a drying agent, wherein the molar ratio of isocyanate groups to hydroxyl groups is (10-8):(2-3); The weight ratio of component A to component B is 1:(0.5-1); The fluorinated silicone polyurethane resin is prepared according to the following steps: Based on the weight parts of the fluorinated diol, at room temperature, 10-20 parts by weight of the fluorinated diol, 10-30 parts by weight of the hydroxyl-terminated polydimethylsiloxane, 30-40 parts by weight of the polyether diol and 10-25 parts by weight of the isocyanate are added to a reaction vessel, heated to 60-90°C, and reacted for 3-5 hours. Then, 1-10 parts by weight of the chain extender are added, and the reaction is carried out for 2-4 hours to obtain the fluorinated silicone polyurethane resin. The polypyrrole-grafted cellulose nanocrystals were prepared according to the following steps: (1) Bromoalkanes and NaOH were added to N,N-dimethylformamide, and then pyrrole was added. After stirring at room temperature for 24 h, bromopyrrole was obtained by column chromatography. (2) Cellulose nanocrystals were added to N,N-dimethylformamide, then bromopyrrole and NaOH were added. After reacting at room temperature for 20 h, the mixture was centrifuged and purified to obtain pyrrole-grafted cellulose nanocrystals. (3) Disperse pyrrole-grafted cellulose nanocrystals in water to form a solution, and then add pyrrole and 0.1 mol / L Fe... 3+ An aqueous solution was added to the solution, and after reacting at room temperature for 6 hours, the pyrrole in the solution and the pyrrole on the surface of the cellulose nanocrystals were reacted in Fe... 3+ Polypyrrole was formed under catalytic oxidation, and the reaction solution was then filtered and dried to obtain the polypyrrole-grafted cellulose nanocrystals.

2. The hydrophobic, anti-icing, water-based protective coating for wind turbine blades according to claim 1, characterized in that, The pigment and filler are titanium dioxide; the isocyanate curing agent is at least one of polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate; the polyether polyol is at least one of polytetrahydrofuran diol, polycaprolactone diol, and polypropylene glycol.

3. The hydrophobic, anti-icing, water-based protective coating for wind turbine blades according to claim 1, characterized in that, The drying agent is at least one of dioctyltin dilaurate, dibutyltin dilaurate, and dibutyltin diacetate, and the drying agent accounts for 0.1-0.5 wt% of component B.

4. The hydrophobic, anti-icing, water-based protective coating for wind turbine blades according to claim 1, characterized in that, In the preparation of the fluorinated silicone polyurethane resin, the number-average molecular weight of the fluorinated diol ranges from 1000 to 4000, and is selected from one or more of polychlorotrifluoroethylene glycol, polyvinyl fluoride glycol, polyvinylidene fluoride glycol, polyperfluoroethylene propylene glycol, ethylene-tetrafluoroethylene copolymer glycol, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer glycol, and ethylene-chlorotrifluoroethylene copolymer glycol. The number-average molecular weight range of the terminal hydroxyl polydimethylsiloxane is 1000-4000; The number-average molecular weight range of the polyether diol is 1000-4000; The isocyanate is selected from one or more of 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,5-naphthalene diisocyanate, phenylmethylene diisocyanate, tetramethylphenylmethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate; The chain extender is selected from one or more of ethylene glycol, propylene glycol, 1,4-butanediol, 1,4-cyclohexanediol, diethylene glycol, neopentyl glycol, and 1,6-hexanediol.

5. The hydrophobic, anti-icing, water-based protective coating for wind turbine blades according to claim 1, characterized in that, In the preparation of the polypyrrole-grafted cellulose nanocrystals, the bromoalkane is one or more of dibromomethane, 1,5-dibromopentane, 1,10-dibromodecane, 1,4-dibromobutane, and 1,12-dibromododecane.

6. The hydrophobic anti-icing water-based protective coating for wind turbine blades according to claim 1, characterized in that, In the preparation of the polypyrrole-grafted cellulose nanocrystals, the amount of NaOH used in step (1) is 50-80% of the mass of bromoalkane, and the mass ratio of bromoalkane to pyrrole is 8:1-4:

3.

7. The hydrophobic, anti-icing, water-based protective coating for wind turbine blades according to claim 1, characterized in that, In the preparation of the polypyrrole-grafted cellulose nanocrystals, the amount of NaOH used in step (2) is 50-80% of the mass of bromopyrrole, and the mass ratio of bromopyrrole to cellulose nanocrystals is 5:2-4:

3.

8. The hydrophobic, anti-icing, water-based protective coating for wind turbine blades according to claim 1, characterized in that, In the preparation of the polypyrrole-grafted cellulose nanocrystals, in step (3), the pyrrole-grafted cellulose nanocrystals are dispersed in water to prepare a 5-10 wt% solution, and the concentration of added pyrrole in the solution is 0.5-1.5 wt%, with 0.1 mol / L Fe 3+ The amount of aqueous solution added is 10-15% of the solution volume.

9. The method for preparing the hydrophobic anti-icing wind turbine blade surface protective water-based coating according to claim 1, characterized in that, Includes the following steps: S1. Fluorosilicone polyurethane resin, polypyrrole grafted cellulose nanocrystals, water, dispersant, pigments and fillers are mixed evenly and then ground. Subsequently, defoamer, leveling agent and ultraviolet light absorber are added and mixed evenly to obtain component A. S2. Add isocyanate curing agent, polyether polyol and drying agent to the reaction vessel, stir and react at 70-80℃ for 4-5 hours, and then cool to obtain component B; S3. Mix component A and component B thoroughly and evenly according to the specified ratio.

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