A highly hydrophobic coating for fan blades and its preparation method

Abstract

The present invention discloses a high-hydrophobic coating for fan blades in the technical field of hydrophobic coatings and a preparation method thereof, comprising the following components in parts by weight: 8-10 parts of a reinforced composite filler and 520-660 parts of a branched double-bond self-healing polyurethane. The present invention realizes the improvement of the hydrophobicity, corrosion resistance and wear resistance of the material by introducing a reinforced composite filler into the polyurethane, and prepares a polyurethane with double bonds on the branches to be well combined with the filler. At the same time, 4,4'-dicarboxydiphenyl disulfide is introduced into the polyurethane coating to achieve the technical effect of self-healing after the material is damaged.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrophobic coatings, and specifically refers to a high-hydrophobic coating for fan blades and a preparation method thereof. Background Art

[0002] With the rapid development of the economy and the increasing improvement of people's living standards, the demand for electricity has been continuously increasing. At present, the main source of electric energy is still thermal power generation, but fossil fuels such as coal and oil are non-renewable energy sources. As the exploitation and storage volume decreases day by day, and the waste gas generated by combustion causes relatively serious environmental pollution; wind energy, as a clean and renewable energy source, has received more and more attention. At present, the utilization rate of onshore and offshore wind power is relatively low, and there is still great room for development. With the continuous consumption of fossil energy, wind power generation will become the trend of future power development; the service life of wind turbines is generally set at 20 years. Fan blades are an important part of them. The blades are costly and difficult to replace and maintain, and are easily damaged by erosion such as hail, sand and dust, salt fog, freezing, rain and snow, which limits the development of wind power generation; polyurethane coatings are formed by the reaction of polyisocyanates and polyols. The cured paint film contains amide groups and ester groups, and hydrogen bond interactions can be formed between molecules, having good adhesion and weather resistance, and can provide effective protection for the substrate.

[0003] At present, the existing technologies mainly have the following problems: the hydrophobicity, corrosion resistance, wear resistance of polyurethane coatings are insufficient and there is no self-healing ability. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the existing technologies, the present invention provides a high-hydrophobic coating for fan blades and a preparation method thereof. In order to solve the problem of poor performance of polyurethane coatings, the present invention proposes to introduce a reinforced composite filler into polyurethane to improve the hydrophobicity, corrosion resistance and wear resistance of the material, and prepare a polyurethane with double bonds on the branched chain to be well combined with the filler. At the same time, 4,4'-dicarboxydiphenyl disulfide is introduced into the polyurethane coating to achieve the technical effect of self-healing after the material is damaged.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows: The present invention provides a high-hydrophobic coating for fan blades, and the high-hydrophobic coating for fan blades comprises the following components in parts by weight: 8-10 parts of a reinforced composite filler and 520-660 parts of a branched-chain double-bond self-healing polyurethane.

[0006] Preferably, the reinforced composite filler is prepared from the following components in parts by weight: 15-25 parts of mica, 6-8 parts of γ-methacryloxypropyltriethoxysilane, 3-4 parts of benzoylacetone, 2.5-3.5 parts of 3-bromopropene, and 5-6 parts of nano-aluminum oxide.

[0007] Preferably, the branched double bond self-healing polyurethane is prepared from the following components in parts by weight: 40-50 parts of diphenylmethane diisocyanate, 8-12 parts of polytetrahydrofuran, 8-10 parts of polyethylene glycol, 1.2-2.3 parts of triphenylmethane triisocyanate, 5-6.5 parts of hydroxyethyl acrylate, and 2-3 parts of 4,4'-dicarboxydiphenyl disulfide.

[0008] Preferably, the particle size of the mica is 15um; the Mn of the polytetrahydrofuran is 650; the Mn of the polyethylene glycol is 400.

[0009] Preferably, the preparation method of the reinforced composite filler specifically includes the following steps:

[0010] (1) Add nano-aluminum oxide to absolute ethanol at an addition amount of 0.2-0.3 g / mL, add γ-methacryloxypropyltriethoxysilane, and stir in a water bath to obtain a modified alumina dispersion;

[0011] (2) Dissolve benzoylacetone in a 3-4 wt% sodium ethoxide ethanol solution at an addition amount of 0.16-0.22 g / mL, add 3-bromopropene dropwise, and stir in a water bath to obtain a reaction solution;

[0012] (3) Rotate and evaporate the reaction solution obtained in step (2) to remove ethanol, add 2 volumes of deionized water after cooling, separate and retain the organic phase, wash 3-5 times, and dry with anhydrous magnesium sulfate to obtain a coordination modifier;

[0013] (4) Add mica to absolute ethanol at an addition amount of 0.15-0.25 g / mL and disperse it evenly, add the coordination modifier obtained in step (3), then dropwise add benzoyl peroxide at 0.8-1.2% of the mass percentage of mica and the modified alumina dispersion obtained in step (1), stir in a water bath, wash and dry to obtain the reinforced composite filler.

[0014] Preferably, in step (1), the water bath stirring is carried out at a temperature of 50-60 °C, a speed of 800-1000 rpm, and a time of 20-30 min.

[0015] Preferably, in step (2), the water bath stirring is carried out at a temperature of 60-70 °C, a speed of 500-600 rpm, and a time of 60-80 min.

[0016] Preferably, in step (4), the water bath stirring is carried out at a temperature of 70-80 °C, a speed of 100-120 rpm, and a time of 30-50 min.

[0017] Preferably, the preparation method of the branched double bond self-healing polyurethane specifically includes the following steps:

[0018] S1. Add triphenylmethane triisocyanate into acetone, and then add 1 - 1.5‰ of dibutyltin dilaurate, mix evenly to obtain mixture 1. Add hydroxyethyl acrylate into acetone, and then add 1.5 - 2 wt‰ of 4 - methoxyphenol, mix evenly to obtain mixture 2.

[0019] S2. Heat the mixture 1 obtained in S1 to 60 °C, and dropwise add the mixture 2 obtained in S1 into the mixture 1 obtained in S1, and carry out a water bath reaction to obtain a reaction solution.

[0020] S3. Add diphenylmethane diisocyanate into the reaction solution obtained in S2, heat it to 80 °C under nitrogen protection, stir and dropwise add polytetrahydrofuran, polyethylene glycol and 4,4'-dicarboxydiphenyl disulfide at 50 - 60 rpm, and then carry out an oil bath stirring to obtain branched - chain double - bond self - healing polyurethane.

[0021] Preferably, in S1, the addition amount of triphenylmethane triisocyanate in acetone is 0.8 - 1 g / mL; the addition amount of hydroxyethyl acrylate in acetone is 1.2 - 1.6 g / mL.

[0022] Preferably, in S2, for the water bath reaction, the temperature is 60 - 70 °C and the time is 4 - 5 h.

[0023] Preferably, in S3, for the oil bath stirring, the temperature is 80 - 90 °C, the speed is 300 - 400 rpm, and the time is 30 - 50 min.

[0024] The present invention also provides a preparation method of a high - hydrophobic coating for a fan blade, which specifically includes the following steps:

[0025] Add the reinforced composite filler into the branched - chain double - bond self - healing polyurethane, add 0.5 wt‰ of benzoyl peroxide, mix evenly to obtain the high - hydrophobic coating for the fan blade.

[0026] The beneficial effects obtained by the present invention are as follows: The present invention modifies nano - alumina with γ - methacryloxypropyltriethoxysilane, and prepares a complexing agent containing double bonds to modify mica with benzoylacetone and 3 - bromopropene, so as to load nano - alumina on mica. The modification of the organic matter enables it to be evenly dispersed in the polyurethane coating. At the same time, the double bonds carried can polymerize with the double - bond - containing polyurethane in the subsequent process, enhancing the cross - linked structure, firmly combining the reinforced composite filler with the polyurethane, and enhancing the hydrophobicity, corrosion resistance and wear resistance; preparing a branched - chain double - bond and bis - NCO prepolymer by modifying triphenylmethane triisocyanate with hydroxyethyl acrylate, using polytetrahydrofuran and polyethylene glycol as soft segments, diphenylmethane diisocyanate as a hard segment, and adding 4,4'-dicarboxydiphenyl disulfide, the prepared polyurethane has branched - chain double bonds and has self - healing ability. Description of the Drawings

[0027] Figure 1 It is the hydrophobic test result diagram of Examples 1-3 and Comparative Examples 1-3 of the present invention;

[0028] Figure 2 It is the wear resistance test result diagram of Examples 1-3 and Comparative Examples 1-3 of the present invention;

[0029] Figure 3 It is the salt spray test result diagram of Examples 1-3 and Comparative Examples 1-3 of the present invention;

[0030] Figure 4 It is the self-healing test result diagram of Example 1 and Comparative Example 4 of the present invention.

[0031] The attached drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. Detailed Embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0033] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to the described content can be applied to the present invention. The preferred implementation methods and materials described herein are only for demonstration purposes, but cannot limit the content of this application.

[0034] The experimental methods in the following embodiments are all conventional methods unless otherwise specified; the test materials used in the following embodiments are all obtained from commercial channels unless otherwise specified.

[0035] Example 1

[0036] A high-hydrophobic coating for fan blades comprises the following components in parts by weight: 8 parts of reinforced composite filler and 520 parts of branched double-bond self-healing polyurethane.

[0037] The reinforced composite filler is prepared from the following components in parts by weight: 15 parts of mica, 6 parts of γ-methacryloxypropyltriethoxysilane, 3 parts of benzoylacetone, 2.5 parts of 3-bromopropene, and 5 parts of nano-aluminum oxide.

[0038] The branched-chain double-bond self-healing polyurethane is prepared from the following components in parts by weight: 40 parts of diphenylmethane diisocyanate, 8 parts of polytetrahydrofuran, 8 parts of polyethylene glycol, 1.2 parts of triphenylmethane triisocyanate, 5 parts of hydroxyethyl acrylate, and 2 parts of 4,4'-dicarboxydiphenyl disulfide.

[0039] The preparation method of the reinforced composite filler specifically includes the following steps:

[0040] (1) Add nano-aluminum oxide to absolute ethanol at an addition amount of 0.2 g / mL, add γ-methacryloxypropyltriethoxysilane, and stir at 800 rpm in a water bath at 50 °C for 20 min to obtain a modified alumina dispersion;

[0041] (2) Dissolve benzoylacetone in a 3 wt% sodium ethoxide ethanol solution at an addition amount of 0.16 g / mL, dropwise add 3-bromopropene, and stir at 500 rpm in a water bath at 60 °C for 60 min to obtain a reaction solution;

[0042] (3) Rotate and evaporate the reaction solution obtained in step (2) to remove ethanol, add 2 volumes of deionized water after cooling, separate and retain the organic phase, wash 3 times, and dry with anhydrous magnesium sulfate to obtain a coordination modifier;

[0043] (4) Add mica to absolute ethanol at an addition amount of 0.15 g / mL for uniform dispersion, add the coordination modifier obtained in step (3), then dropwise add benzoyl peroxide at 0.8% of the mass percentage of mica and the modified alumina dispersion obtained in step (1), stir at 100 rpm in a water bath at 70 °C for 30 min, filter, wash, and dry to obtain the reinforced composite filler.

[0044] The preparation method of the branched-chain double-bond self-healing polyurethane specifically includes the following steps:

[0045] S1. Add triphenylmethane triisocyanate to acetone at an addition amount of 0.8 g / mL, then add 1‰ of dibutyltin dilaurate, and mix evenly to obtain a mixed solution 1. Add hydroxyethyl acrylate to acetone at an addition amount of 1.2 g / mL, then add 1.5 wt‰ of 4-methoxyphenol, and mix evenly to obtain a mixed solution 2;

[0046] S2. Heat the mixed solution 1 obtained in S1 to 60 °C, and dropwise add the mixed solution 2 obtained in S1 to the mixed solution 1 obtained in S1, and react in a water bath at 60 °C for 4 h to obtain a reaction solution;

[0047] S3. Add diphenylmethane diisocyanate to the reaction solution obtained in S2, heat to 80 °C under nitrogen protection, stir and dropwise add polytetrahydrofuran, polyethylene glycol, and 4,4'-dicarboxydiphenyl disulfide at 50 rpm, and then stir at 300 rpm in an oil bath at 80 °C for 30 min to obtain the branched-chain double-bond self-healing polyurethane.

[0048] The present invention also provides a preparation method of a highly hydrophobic coating for fan blades, which specifically includes the following steps:

[0049] Add the reinforced composite filler to the branched double-bond self-healing polyurethane, add 0.5 wt‰ of benzoyl peroxide, and mix evenly to obtain the highly hydrophobic coating for fan blades.

[0050] Example 2

[0051] A highly hydrophobic coating for fan blades comprises the following components in parts by weight: 10 parts of reinforced composite filler and 660 parts of branched double-bond self-healing polyurethane.

[0052] The reinforced composite filler is prepared from the following components in parts by weight: 25 parts of mica, 8 parts of γ-methacryloxypropyltriethoxysilane, 4 parts of benzoylacetone, 3.5 parts of 3-bromopropene, and 6 parts of nano-aluminum oxide.

[0053] The branched double-bond self-healing polyurethane is prepared from the following components in parts by weight: 50 parts of diphenylmethane diisocyanate, 12 parts of polytetrahydrofuran, 10 parts of polyethylene glycol, 2.3 parts of triphenylmethane triisocyanate, 6.5 parts of hydroxyethyl acrylate, and 3 parts of 4,4'-dicarboxydiphenyl disulfide.

[0054] The preparation method of the reinforced composite filler specifically includes the following steps:

[0055] (1) Add nano-aluminum oxide to absolute ethanol at an addition amount of 0.3 g / mL, add γ-methacryloxypropyltriethoxysilane, and stir at 1000 rpm in a 60°C water bath for 30 min to obtain a modified alumina dispersion;

[0056] (2) Dissolve benzoylacetone in a 4 wt% sodium ethoxide ethanol solution at an addition amount of 0.22 g / mL, dropwise add 3-bromopropene, and stir at 5600 rpm in a 70°C water bath for 80 min to obtain a reaction solution;

[0057] (3) Rotate and evaporate the reaction solution obtained in step (2) to remove ethanol, cool, add 2 volumes of deionized water, separate and retain the organic phase, wash 5 times, and dry with anhydrous magnesium sulfate to obtain a coordination modifier;

[0058] (4) Add mica to absolute ethanol at an addition amount of 0.25 g / mL and disperse evenly, add the coordination modifier obtained in step (3), then dropwise add 1.2% of benzoyl peroxide by mass percentage of mica and the modified alumina dispersion obtained in step (1), stir at 120 rpm in an 80°C water bath for 50 min, filter, wash, and dry to obtain the reinforced composite filler.

[0059] Preparation method of branched-chain double-bond self-healing polyurethane, specifically including the following steps:

[0060] S1. Add triphenylmethane triisocyanate to acetone at an addition amount of 1 g / mL, and then add 1.5‰ of dibutyltin dilaurate, and mix evenly to obtain mixture 1. Add hydroxyethyl acrylate to acetone at an addition amount of 1.6 g / mL, and then add 2 wt‰ of 4-methoxyphenol, and mix evenly to obtain mixture 2;

[0061] S2. Heat the mixture 1 obtained in S1 to 60 °C, and dropwise add the mixture 2 obtained in S1 to the mixture 1 obtained in S1, and react in a water bath at 70 °C for 5 h to obtain a reaction solution;

[0062] S3. Add diphenylmethane diisocyanate to the reaction solution obtained in S2, heat to 80 °C under nitrogen protection, stir and dropwise add polytetrahydrofuran, polyethylene glycol and 4,4'-dicarboxydiphenyl disulfide at 60 rpm, and then stir at 400 rpm in an oil bath at 90 °C for 50 min to obtain branched-chain double-bond self-healing polyurethane.

[0063] The present invention also provides a preparation method of a high-hydrophobic coating for fan blades, specifically including the following steps:

[0064] Add the reinforced composite filler to the branched-chain double-bond self-healing polyurethane, add 0.5 wt‰ of dibenzoyl peroxide, and mix evenly to obtain a high-hydrophobic coating for fan blades.

[0065] Example 3

[0066] A high-hydrophobic coating for fan blades includes the following components in parts by weight: 9 parts of reinforced composite filler and 600 parts of branched-chain double-bond self-healing polyurethane.

[0067] The reinforced composite filler is prepared from the following components in parts by weight: 20 parts of mica, 7 parts of γ-methacryloxypropyltriethoxysilane, 3.5 parts of benzoylacetone, 3 parts of 3-bromopropene and 5.5 parts of nano-aluminum oxide.

[0068] The branched-chain double-bond self-healing polyurethane is prepared from the following components in parts by weight: 45 parts of diphenylmethane diisocyanate, 10 parts of polytetrahydrofuran, 9 parts of polyethylene glycol, 2 parts of triphenylmethane triisocyanate, 6 parts of hydroxyethyl acrylate and 2.5 parts of 4,4'-dicarboxydiphenyl disulfide.

[0069] Preparation method of the reinforced composite filler, specifically including the following steps:

[0070] (1) Add nano-aluminum oxide to absolute ethanol at an addition amount of 0.25 g / mL, add γ-methacryloxypropyltriethoxysilane, and stir at 900 rpm in a water bath at 55 °C for 25 min to obtain a modified alumina dispersion;

[0071] (2) Dissolve benzoylacetone at an addition amount of 0.2 g / mL in a 3.5 wt% sodium ethoxide ethanol solution, dropwise add 3-bromopropene, and stir at 550 rpm in a 65 °C water bath for 70 min to obtain a reaction solution.

[0072] (3) Rotate and evaporate the ethanol from the reaction solution obtained in step (2), add 2 volumes of deionized water after cooling, separate and retain the organic phase, wash 4 times, and dry with anhydrous magnesium sulfate to obtain a coordination modifier.

[0073] (4) Add mica at an addition amount of 0.2 g / mL to anhydrous ethanol to disperse it evenly, add the coordination modifier obtained in step (3), then dropwise add benzoyl peroxide at 1% of the mass percentage of mica and the modified alumina dispersion obtained in step (1) respectively, stir at 110 rpm in a 75 °C water bath for 40 min, filter, wash, and dry to obtain a reinforced composite filler.

[0074] A preparation method of branched double-bond self-healing polyurethane specifically includes the following steps:

[0075] S1. Add triphenylmethane triisocyanate at an addition amount of 0.9 g / mL to acetone, then add 1.3‰ of dibutyltin dilaurate, mix evenly to obtain mixture 1. Add hydroxyethyl acrylate at an addition amount of 1.4 g / mL to acetone, then add 1.8 wt‰ of 4-methoxyphenol, mix evenly to obtain mixture 2.

[0076] S2. Heat the mixture 1 obtained in S1 to 60 °C, dropwise add the mixture 2 obtained in S1 to the mixture 1 obtained in S1, and react in a 65 °C water bath for 4.5 h to obtain a reaction solution.

[0077] S3. Add diphenylmethane diisocyanate to the reaction solution obtained in S2, heat to 80 °C under nitrogen protection, stir and dropwise add polytetrahydrofuran, polyethylene glycol, and 4,4'-dicarboxydiphenyl disulfide at 55 rpm, then stir at 350 rpm in an 85 °C oil bath for 40 min to obtain branched double-bond self-healing polyurethane.

[0078] The present invention also provides a preparation method of a highly hydrophobic coating for a fan blade, specifically including the following steps:

[0079] Add the reinforced composite filler to the branched double-bond self-healing polyurethane, add 0.5 wt‰ of benzoyl peroxide, and mix evenly to obtain a highly hydrophobic coating for a fan blade.

[0080] Comparative Example 1

[0081] This comparative example provides a coating, which is different from Example 1 only in that the components do not contain benzoylacetone and 3-bromopropene, that is, the coordination modifier is not prepared in step (3), and the other components and their contents are the same as those in Example 1.

[0082] Comparative Example 2

[0083] This comparative example provides a coating, which is different from Example 1 only in that the components do not contain γ-methacryloxypropyltriethoxysilane, and the other components and their contents are the same as those in Example 1.

[0084] Comparative Example 3

[0085] This comparative example provides a coating, which is different from Example 1 only in that the components do not contain triphenylmethane triisocyanate, and the other components and their contents are the same as those in Example 1.

[0086] Comparative Example 4

[0087] This comparative example provides a coating, which is different from Example 1 only in that the components do not contain 4,4'-dicarboxydiphenyl disulfide, and the other components and their contents are the same as those in Example 1.

[0088] Experimental Example

[0089] 1. Hydrophobicity test

[0090] Spray Examples 1-3 and Comparative Examples 1-3 on a steel plate with a coating thickness of 80 μm. After drying, respectively suck 5 μl of water droplets onto the surface of each group of coatings. After placing for 20 s, place the material on a test platform and use an SDC-350 type contact angle measuring instrument to measure the contact angle;

[0091] Figure 1 This is the hydrophobicity test result diagram of Examples 1-3 and Comparative Examples 1-3 of the present invention; as shown in the figure, the contact angles of Examples 1-3 and Comparative Examples 1-3 are 162.3°, 163.6°, 166.1°, 116.5°, 93.3°, and 136.8° respectively. The contact angles of Examples 1-3 are significantly greater than those of Comparative Examples 1-3, indicating that the hydrophobicity of Examples 1-3 is stronger than that of Comparative Examples 1-3. The preparation of the coordination modifier, the strengthening composite filler, and the use of triphenylmethane triisocyanate improve the hydrophobicity of the material.

[0092] 2. Abrasion resistance test

[0093] Spray Examples 1-3 and Comparative Examples 1-3 on a steel plate with a coating thickness of 80 μm. After drying, respectively drop quartz sand with a diameter of 0.5-1 mm from a height of 30 cm at a flow rate of 3 m / s, and impact the sample at an inclination of 60°. Take samples once every 5 seconds until the hydrophobic performance of the sample is completely lost, and record the impact time of each group.

[0094] Figure 2 This is the abrasion resistance test result graph of Examples 1-3 and Comparative Examples 1-3 of the present invention; as shown in the figure, the impact times of Examples 1-3 and Comparative Examples 1-3 are 180s, 180s, 180s, 120s, 100s, and 135s respectively. The impact times of Examples 1-3 are significantly greater than those of Comparative Examples 1-3, indicating that the abrasion resistance of Examples 1-3 is stronger than that of Comparative Examples 1-3. The preparation of the coordination modifier, the reinforcing composite filler, and the use of triphenylmethane triisocyanate improve the abrasion resistance of the material.

[0095] 3. Salt spray test

[0096] Spray Examples 1-3 and Comparative Examples 1-3 on a steel plate with a coating thickness of 80um. After drying, use a cutter to cut through the coating film until the steel plate is exposed and seal the edges with wax. The scratch is more than 20mm away from any edge of the steel plate, and place it in a salt spray chamber at 35°C for testing. Record the corrosion situation. When rust spots appear on the plate surface or the rust spreads more than 2cm at the scratched line, it is recorded as the salt spray resistance time;

[0097] Figure 3 This is the salt spray test result graph of Examples 1-3 and Comparative Examples 1-3 of the present invention; as shown in the figure, the salt spray resistance times of Examples 1-3 and Comparative Examples 1-3 are 306.3h, 302.6h, 304.1h, 222.7h, 193.1h, and 249.5h respectively. The salt spray resistance times of Examples 1-3 are significantly greater than those of Comparative Examples 1-3, indicating that the corrosion resistance of Examples 1-3 is stronger than that of Comparative Examples 1-3. The preparation of the coordination modifier, the reinforcing composite filler, and the use of triphenylmethane triisocyanate improve the corrosion resistance of the material.

[0098] 4. Self-healing test

[0099] Spray Example 1 and Comparative Example 4 on a steel plate with a coating thickness of 80um. After drying, according to the abrasion resistance test, use quartz sand to impact for 30s, and perform hydrophobicity tests every 0.5h for a total of 4 times, and record the contact angle;

[0100] Figure 4 This is the self-healing test result graph of Example 1 and Comparative Example 4 of the present invention; as shown in the figure, for the 4 tests, the contact angles of Example 1 are 142.3, 156.8, 159.8, and 161.4 respectively, and the contact angles of Comparative Example 4 are 97.2, 96.3, 96.6, and 96.8 respectively. The self-healing ability of Example 1 is significantly better than that of Comparative Example 4. The use of 4,4'-dicarboxydiphenyl disulfide improves the self-healing ability of the material.

[0101] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

[0102] The present invention and its embodiments have been described above. Such description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual application is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the spirit of the present invention, design in a non-creative way similar methods and embodiments to the technical solution, they shall fall within the protection scope of the present invention.

Claims

1. A highly hydrophobic coating for a fan blade, characterized in that: It comprises the following components in parts by weight: 8 - 10 parts of reinforced composite filler and 520 - 660 parts of branched double - bond self - healing polyurethane; the reinforced composite filler is prepared from the following components in parts by weight: 15 - 25 parts of mica, 6 - 8 parts of γ - methacryloxypropyltriethoxysilane, 3 - 4 parts of benzoylacetone, 2.5 - 3.5 parts of 3 - bromopropene, and 5 - 6 parts of nano - alumina; the branched double - bond self - healing polyurethane is prepared from the following components in parts by weight: 40 - 50 parts of diphenylmethane diisocyanate, 8 - 12 parts of polytetrahydrofuran, 8 - 10 parts of polyethylene glycol, 1.2 - 2.3 parts of triphenylmethane triisocyanate, 5 - 6.5 parts of hydroxyethyl acrylate, and 2 - 3 parts of 4,4'-dicarboxydiphenyl disulfide; The preparation method of the reinforced composite filler specifically comprises the following steps: (1) Add nano - alumina into absolute ethanol at an addition amount of 0.2 - 0.3 g / mL, add γ - methacryloxypropyltriethoxysilane, and stir in a water bath to obtain a modified alumina dispersion; (2) Dissolve benzoylacetone in a sodium ethoxide ethanol solution with a concentration of 3 - 4 wt% at an addition amount of 0.16 - 0.22 g / mL, dropwise add 3 - bromopropene, and stir in a water bath to obtain a reaction solution; (3) Rotate - evaporate the reaction solution obtained in step (2) to remove ethanol, add 2 volumes of deionized water after cooling, separate and retain the organic phase, wash 3 - 5 times, and dry with anhydrous magnesium sulfate to obtain a coordination modifier; (4) Add mica into absolute ethanol at an addition amount of 0.15 - 0.25 g / mL for uniform dispersion, add the coordination modifier obtained in step (3), then dropwise add dibenzoyl peroxide at 0.8 - 1.2% of the mass percentage of mica and the modified alumina dispersion obtained in step (1) respectively, stir in a water bath, wash and dry to obtain the reinforced composite filler; The preparation method of the high - hydrophobic coating for fan blades specifically comprises the following steps: Add the reinforced composite filler into the branched double - bond self - healing polyurethane, add 0.5 wt‰ of dibenzoyl peroxide, and mix evenly to obtain the high - hydrophobic coating for fan blades.

2. The high-hydrophobic coating for a wind turbine blade according to claim 1, wherein: In step (1), for the water - bath stirring, the temperature is 50 - 60 °C, the speed is 800 - 1000 rpm, and the time is 20 - 30 min.

3. The highly hydrophobic coating for wind turbine blades according to claim 2, wherein: In step (2), for the water - bath stirring, the temperature is 60 - 70 °C, the speed is 500 - 600 rpm, and the time is 60 - 80 min.

4. The high-hydrophobic coating for a wind turbine blade according to claim 3, wherein: In step (4), for the water - bath stirring, the temperature is 70 - 80 °C, the speed is 100 - 120 rpm, and the time is 30 - 50 min.

5. The high-hydrophobic coating for a wind turbine blade according to claim 4, characterized in that: The preparation method of the branched double - bond self - healing polyurethane specifically comprises the following steps: S1. Add triphenylmethane triisocyanate into acetone, then add 1 - 1.5‰ of dibutyltin dilaurate, and mix evenly to obtain mixture 1. Add hydroxyethyl acrylate into acetone, then add 1.5 - 2 wt‰ of 4 - methoxyphenol, and mix evenly to obtain mixture 2; S2. Heat the mixture 1 obtained in S1 to 60 °C, dropwise add the mixture 2 obtained in S1 into the mixture 1 obtained in S1, and react in a water bath to obtain a reaction solution; S3. Add diphenylmethane diisocyanate to the reaction solution obtained in S2, heat it to 80°C under nitrogen protection, stir and dropwise add polytetrahydrofuran, polyethylene glycol and 4,4'-dicarboxydiphenyl disulfide at 50 - 60 rpm, and then stir in an oil bath to obtain branched double bond self-healing polyurethane.

6. The high-hydrophobic coating for a wind turbine blade according to claim 5, wherein: In S1, the addition amount of triphenylmethane triisocyanate in acetone is 0.8 - 1 g / mL; the addition amount of hydroxyethyl acrylate in acetone is 1.2 - 1.6 g / mL.

7. The high-hydrophobic coating for a wind turbine blade according to claim 6, wherein: In S2, for the water bath reaction, the temperature is 60 - 70°C and the time is 4 - 5 h.

8. The high-hydrophobic coating for a wind turbine blade according to claim 7, characterized in that: In S3, for the oil bath stirring, the temperature is 80 - 90°C, the speed is 300 - 400 rpm, and the time is 30 - 50 min.

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