A two-component bio-based self-cleaning anticorrosive coating for power transmission lines and a preparation method thereof

Abstract

The application belongs to the field of polyurethane materials, and discloses a two-component bio-based self-cleaning anticorrosive coating for power transmission lines and a preparation method thereof, which comprises A component and B component with a mass ratio of 1:1-2; the A component is composed of the following components in parts by mass: bio-based polyurethane prepolymer 70-75 parts, hydrotalcite 5-8 parts, stearic acid 6-8 parts, modified fumed silica 3-5 parts, dibutyl titanate 0.1-0.2 parts, substrate binder C 3-5 parts, and substrate binder D 4-6 parts. The B component is composed of the following components: bio-based polyaspartic acid ester 85-90 parts, color paste 3-5 parts, defoaming agent 2-3 parts, leveling agent 1-2 parts, anti-precipitation additive 1-2 parts, and silane 2-4 parts. The two-component bio-based self-cleaning anticorrosive coating for power transmission lines does not need primer and topcoat, can meet the requirements of corrosion resistance, weather resistance and self-cleaning effect, can achieve long-acting self-cleaning effect, can improve construction efficiency, and can simplify the construction process.

Description

Technical Field

[0001] This invention belongs to the field of polyurethane materials and relates to a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines and its preparation method. Background Technology

[0002] Extensive icing on power transmission lines has caused tower collapses and line breaks due to excessive load on the towers, damaging power facilities and inconveniencing people's lives and travel, especially in high-altitude and mountainous areas where maintenance is difficult. Conventional de-icing and snow removal operations consume a lot of manpower and resources, but they pose challenges in high-altitude, mountainous, and remote areas.

[0003] Therefore, researching anti-icing technologies for power lines and towers, and developing effective anti-icing coatings, is beneficial for the safe and stable operation of power systems. Chinese patent CN112852289A discloses a superhydrophobic anti-icing and de-icing coating with photothermal effect and its preparation method. It involves preparing photothermal melanin nanoparticles from ink sacs; hydrophobically modifying SiO2 nanoparticles with perfluorodecyltriethoxysilane to prepare hydrophobic SiO2 nanoparticles; preparing a spraying solution by blending the melanin nanoparticles with polydimethylsiloxane, and then spraying it onto a substrate to prepare a photothermal coating; subsequently, spraying the hydrophobically treated SiO2 nanoparticle dispersion onto the surface of the photothermal coating to obtain a superhydrophobic anti-icing coating with photothermal de-icing properties. Although the coating exhibits excellent photothermal de-icing performance and superhydrophobic anti-icing properties, it is still difficult to maintain its effectiveness in harsh environments for extended periods, and its weather resistance needs further improvement. Chinese patent CN106675354A discloses an anti-corrosion coating for power poles, which belongs to the field of anti-corrosion coatings. It mainly comprises the following raw materials by weight: 28-30 parts nano-magnetic iron oxide, 10-12 parts inert diluent, 18-20 parts alkyd resin, 10-11 parts polyvinyl alcohol, 7-9 parts glyceryl trioleate, 1.25 parts dispersant, 14-15 parts acetone, 18-19 parts methyl isobutyl ketone, and 1-1.5 parts tributyl phosphate. This anti-corrosion coating for power poles exhibits poor resistance to temperature changes, and its hydrophobicity needs improvement. Chinese patent CN113831829A discloses a polyurethane anti-icing coating, its preparation method, and its application. The raw materials for preparing the polyurethane anti-icing coating include a specific proportion of aliphatic isocyanate, fluorinated diol, hydroxyl silicone oil, emulsifying chain extender, crosslinking agent, post-crosslinking agent, and nanoparticles. Fluorinated diol and aliphatic isocyanate are selected as raw materials. The reaction between the two successfully introduces fluorine atoms into the molecular chain of the synthesized product. Hydroxyl silicone oil is further added to introduce silicon into the molecular chain of the synthesized product. Combined with self-emulsifying chain extender, post-crosslinking agent, and nanoparticles, the resulting polyurethane anti-icing coating has wide applicability. Although the hydrophobicity, anti-icing properties, and durability of this coating are improved to a certain extent, its static contact angle is only 119-138°, its roll-off angle is 14-20°, and its ice-binding strength is only 97-127 kPa. Its weather resistance needs further improvement.

[0004] Therefore, there is a need to develop a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines with excellent weather resistance and stable product performance, as well as its preparation method. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines and its preparation method. It can be directly applied to power lines and towers. It has good low-temperature flexibility, excellent weather resistance and wear resistance, high bonding strength with metal substrates, low surface energy, and a lotus leaf-like structure to achieve self-cleaning and anti-icing effects, and has a long-lasting self-cleaning effect.

[0006] The technical solution adopted by this invention to solve the technical problem is:

[0007] This invention provides a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising component A and component B in a mass ratio of 1:1-2;

[0008] Component A, by mass fraction, consists of the following components:

[0009] 70-75 parts of bio-based polyurethane prepolymer,

[0010] 5-8 parts hydrotalcite

[0011] 6-10 parts stearic acid

[0012] 3-5 parts of modified fumed silica

[0013] Dibutyl titanate 0.1-0.2 parts,

[0014] Substrate adhesive C 3-5 parts,

[0015] Substrate adhesive D 4-6 parts;

[0016] The bio-based polyurethane prepolymer is prepared from the following raw materials in parts by weight:

[0017] 61-66 parts of bio-based pentamethylene diisocyanate

[0018] 3.5-4.5 parts of bio-based glycerin.

[0019] 32-37 parts castor oil

[0020] 0.05-0.1 parts of dibutyltin dilaurate;

[0021] The substrate adhesive C, by weight, is prepared from the following raw materials:

[0022] 52.5-55.3 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 44.2-47.1 parts of isophorone diisocyanate, and 0.3-0.5 parts of dibutyltin dilaurate;

[0023] The substrate adhesive D is prepared from the following raw materials in parts by weight:

[0024] Octyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate 66.5-68.7 parts, isophthalic acid diisocyanate 30.7-33.3 parts, dibutyltin dilaurate 0.2-0.6 parts;

[0025] Component B, by mass fraction, consists of the following components:

[0026] 85-90 parts of bio-based polyaspartic acid ester

[0027] 3-5 parts color paste

[0028] 2-3 parts defoamer

[0029] 1-2 parts leveling agent

[0030] 1-2 parts of anti-settling agent

[0031] 2-4 parts of silane coupling agent;

[0032] The bio-based polyaspartic acid ester is prepared from the following raw materials in parts by weight:

[0033] Bio-based glycerin 7.2-7.9 parts,

[0034] Maleic anhydride 22.8-25.6 parts,

[0035] Bio-based 2-octanol 20.1-22.7 parts,

[0036] Octadecanol 20.5-22.7 parts,

[0037] Cyclohexylamine 22.5-25.8 parts.

[0038] Furthermore, the modified fumed silica is one or more of KP-15, aerosil r202, qs-102, and H15.

[0039] Furthermore, the pigment is one or more of the following: gray pigment from Changzhou Qiushuo Chemical Co., Ltd., gray pigment SK101A from Dongguan Chongyao New Material Technology Co., Ltd., and gray pigment from Guangzhou Sanlian New Material Technology Co., Ltd.

[0040] Furthermore, the silane coupling agent is one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, and 3-(2-aminoethylamino)propyltrimethoxysilane.

[0041] Furthermore, the leveling agent is one or more of KMT-5502, BYK-354, and Glide410.

[0042] Furthermore, one or more of the following defoamers: KMT-2053, BYK-054, and Airex 920.

[0043] Furthermore, one or more of the following anti-precipitation additives: KMT-4006, RHEOBYK-411, and BP-186.

[0044] Another aspect of the present invention provides a method for preparing the two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising: mixing and stirring component A and component B at a temperature of 15-35°C for 5-8 minutes to degas, thereby obtaining the two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0045] The preparation method of component A includes the following steps:

[0046] Bio-based polyurethane prepolymer, hydrotalcite, stearic acid, modified fumed silica, dibutyl titanate, substrate binder C, and substrate binder D are added to a sealed mixing tank. The stirring speed is set to 200-300 r / min, and the mixture is stirred for 20-40 min to obtain component A.

[0047] The preparation method of component B is as follows:

[0048] Bio-based polyaspartic acid ester, color paste, defoamer, and anti-precipitation agent are added to a high-speed dispersion vessel. The dispersion speed is set to 1200-1500 r / min, and the dispersion time is 20-25 min. Then, a leveling agent is added, and the dispersion speed is set to 400-500 r / min. The dispersion time is 10-15 min to obtain component B.

[0049] Furthermore, the method for preparing the bio-based polyurethane prepolymer includes the following steps:

[0050] Castor oil and bio-based glycerol were added to a four-necked flask under nitrogen protection. The temperature was set to 195-215℃ and stirred for 2 hours. The temperature was then lowered to 80-85℃ and bio-based pentamethylene diisocyanate was added. The catalyst was dibutyltin dilaurate. The reaction was carried out for 2-3 hours to obtain a bio-based polyurethane prepolymer.

[0051] Furthermore, the preparation method of the substrate adhesive C includes the following steps:

[0052] 1,3,5-Trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene and isophorone diisocyanate were added to a three-necked flask equipped with a mechanical stirrer and a thermometer at a molar ratio of 1:3 and mixed thoroughly. The mixture was heated to 80°C, and dibutyltin dilaurate catalyst was added. The mixture was then heated to 90-95°C and reacted for 2.5-3 hours to obtain substrate adhesive C.

[0053] The preparation method of the substrate adhesive D includes the following steps:

[0054] Octyl alcohol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and isophthalic acid diisocyanate were added to a three-necked flask equipped with a mechanical stirrer and a thermometer, mixed evenly, and the temperature was set to 80-85℃. After dissolution, dibutyltin dilaurate was added, and the mixture was stirred at 90-95℃ for 2.5-3 hours to obtain substrate adhesive D.

[0055] Furthermore, the preparation method of the bio-based polyaspartic acid ester includes the following steps:

[0056] Bio-based glycerol and maleic anhydride were added to a nitrogen-filled, distillation-graded four-necked flask. The temperature was set to 60-65℃, and then raised to 95-100℃ and held for 1 hour. Under nitrogen protection, bio-based 2-octanol and octadecyl alcohol were added, and the temperature was raised to 195-205℃ and held for 2.5-3 hours. The temperature was then raised to 220-225℃ and held for 1-1.5 hours. Heating was stopped when the acid value dropped to 5 mg (KOH) / g. The temperature was lowered to 40-45℃, and cyclohexylamine was added dropwise over 30-35 minutes. The mixture was stirred for 3 hours, then raised to 60-65℃ and stirred for 2 hours. The temperature was then raised to 105℃ and stirred for 12-15 hours. Heating was then stopped to obtain bio-based polyaspartic acid ester.

[0057] The advantages and positive effects of this invention are:

[0058] 1. This invention utilizes organosilane-modified polyurethane (self-made bio-based polyurethane prepolymer and bio-based polyaspartic acid ester) to increase the interfacial bonding strength. The substrate adhesive C and substrate adhesive D work synergistically to not only improve the coating's interfacial bonding strength, but also improve its resistance to ultraviolet aging and heat aging.

[0059] 2. This invention utilizes bio-based materials to prepare a coating with low surface energy, which plays a role in energy saving and emission reduction. It has excellent weather resistance and wear resistance, and can improve the service life of the coating in circuits.

[0060] In summary, the two-component bio-based self-cleaning anti-corrosion coating for power transmission lines provided by this invention, through the synergistic combination of its components, results in a self-cleaning and anti-icing coating. When applied to high-voltage lines and towers, it can reduce icing and achieve a natural de-icing effect, allowing for direct application on the lines. Verification has shown that the two-component bio-based self-cleaning anti-corrosion coating for power transmission lines prepared using this invention exhibits a roll-off angle of less than 10°, a contact angle of greater than 150°, a wear of less than 10 mg, a substrate adhesion strength of greater than 10 MPa, and a roll-off angle of less than 12° and a contact angle of greater than 140° after 1500 hours under UVB. It demonstrates excellent weather resistance, meets the requirements for long-term self-cleaning, eliminates the need for primer and topcoat, improves construction efficiency, and simplifies the construction process. Detailed Implementation

[0061] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0062] Example 1

[0063] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0064] (1) Preparation of component A:

[0065] Add 32 parts castor oil and 4.5 parts bio-based glycerol to a four-necked flask with nitrogen protection, set the temperature to 200°C, stir for 2 hours, cool down to 85°C, add 63.45 parts bio-based pentamethylene diisocyanate and 0.05 parts dibutyltin dilaurate, react for 3 hours to obtain bio-based polyurethane prepolymer 1#.

[0066] 70 parts of bio-based polyurethane prepolymer 1#, 8 parts of hydrotalcite, 10 parts of stearic acid, 3 parts of modified fumed silica KP-15, 0.2 parts of dibutyl titanate, 3 parts of substrate binder C, and 5.8 parts of substrate binder D were added into a sealed mixing tank. The stirring speed was set to 200 r / min and stirred for 40 min to obtain component A.

[0067] The preparation method of the substrate adhesive C includes the following steps:

[0068] 77.5 g of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene and 66.6 g of isophorone diisocyanate were added to a three-necked flask equipped with a mechanical stirrer and a thermometer and mixed thoroughly. The mixture was heated to 80°C, and 0.05 g of dibutyltin dilaurate catalyst was added. The mixture was then heated to 95°C and reacted for 2.5 h to obtain substrate adhesive C.

[0069] The preparation method of the substrate adhesive D includes the following steps:

[0070] 390g of octyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 188g of isophthalic acid diisocyanate were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. The mixture was stirred until homogeneous and the temperature was set to 85°C. After dissolution, 0.13g of dibutyltin dilaurate was added. The mixture was stirred at 95°C for 2.5 hours to obtain substrate adhesive D.

[0071] (2) Preparation of component B:

[0072] The preparation method of bio-based polyaspartic acid ester includes the following steps:

[0073] 7.6 parts of bio-based glycerol and 24.2 parts of maleic anhydride were added to a nitrogen-filled, distillation-grade four-necked flask. The temperature was set at 65°C and raised to 95°C, where it was held for 1 hour. Under nitrogen protection, 21.4 parts of bio-based 2-octanol and 22.3 parts of octadecyl alcohol were added. The temperature was raised to 195°C and held for 2.5 hours, then raised to 220°C and held for 1.5 hours. Heating was stopped when the acid value dropped to 5 mg (KOH) / g. The temperature was lowered to 45°C, and 24.5 parts of cyclohexylamine were added dropwise over 30 minutes. The mixture was stirred for 3 hours, then raised to 60°C and stirred for 2 hours. The temperature was then raised to 105°C and stirred for 12 hours before heating was stopped, yielding bio-based polyaspartic acid ester.

[0074] 85 parts of bio-based polyaspartic acid ester, 5 parts of color paste, 3 parts of defoamer KMT-2053, and 2 parts of anti-precipitation agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1500 r / min and the dispersion was carried out for 20-25 min. Then, 1 part of leveling agent KMT-5502 and 4 parts of γ-glycidyl etheroxypropyltrimethoxysilane were added. The dispersion speed was set to 500 r / min and the dispersion was carried out for 10 min to obtain component B.

[0075] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0076] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0077] Example 2

[0078] A two-component bio-based self-cleaning anti-corrosion coating for power transmission lines includes:

[0079] (1) Preparation of component A:

[0080] 75 parts of bio-based polyurethane prepolymer 1#, 5 parts of hydrotalcite, 8 parts of stearic acid, 4.9 parts of modified fumed silica KP-15, 0.1 parts of dibutyl titanate, 3 parts of substrate binder C, and 4 parts of substrate binder D were added to a sealed stirred tank. The stirring speed was set to 300 r / min, and the mixture was stirred for 40 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 1#, substrate binder C, and substrate binder D are the same as in Example 1.

[0081] (2) Preparation of component B:

[0082] 90 parts of bio-based polyaspartic acid ester, 3 parts of color paste, 2 parts of defoamer KMT-2053, and 1 part of anti-precipitation agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1200 r / min, and the dispersion time was 25 min. 2 parts of leveling agent KMT-5502 and 2 parts of γ-glycidyl etheroxypropyltrimethoxysilane were then added, and the dispersion speed was set to 400 r / min, and the dispersion time was 15 min, to obtain component B. The preparation of the bio-based polyaspartic acid ester was the same as in Example 1.

[0083] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0084] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0085] Example 3

[0086] A two-component bio-based self-cleaning anti-corrosion coating for power transmission lines includes:

[0087] (1) Preparation of component A:

[0088] 71.85 parts of bio-based polyurethane prepolymer 1#, 6 parts of hydrotalcite, 6 parts of stearic acid, 5 parts of modified fumed silica KP-15, 0.15 parts of dibutyl titanate, 5 parts of substrate binder C, and 6 parts of substrate binder D were added to a sealed stirred tank. The stirring speed was set to 200 r / min, and the mixture was stirred for 40 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 1#, substrate binder C, and substrate binder D are the same as in Example 1.

[0089] (2) Preparation of component B:

[0090] 87.6 parts of bio-based polyaspartic acid ester, 4 parts of color paste, 2.4 parts of defoamer KMT-2053, and 1.5 parts of anti-precipitation agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1200 r / min, and the dispersion time was 25 min. 1.5 parts of leveling agent KMT-5502 and 3 parts of γ-glycidyl etheroxypropyltrimethoxysilane were then added, and the dispersion speed was set to 500 r / min, and the dispersion time was 10 min to obtain component B. The preparation of the bio-based polyaspartic acid ester was the same as in Example 1.

[0091] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0092] At a temperature of 15℃, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0093] Example 4

[0094] A two-component bio-based self-cleaning anti-corrosion coating for power transmission lines includes:

[0095] (1) Preparation of component A:

[0096] 37 parts castor oil and 3.5 parts bio-based glycerol were added to a four-necked flask under nitrogen protection. The temperature was set to 195°C and stirred for 2 hours. The temperature was then lowered to 80°C and 59.4 parts bio-based pentamethylene diisocyanate and 0.1 parts dibutyltin dilaurate were added. The reaction was carried out for 3 hours to obtain bio-based polyurethane prepolymer 2#.

[0097] 70 parts of bio-based polyurethane prepolymer 2#, 8 parts of hydrotalcite, 10 parts of stearic acid, 3 parts of modified fumed silica KP-15, 0.2 parts of dibutyl titanate, 3 parts of substrate binder C, and 5.8 parts of substrate binder D were added to a sealed mixing tank and stirred at a speed of 300 r / min for 40 min to obtain component A. The preparation methods of substrate binder C and substrate binder D are the same as in Example 1.

[0098] (2) Preparation of component B:

[0099] 87.3 parts of bio-based polyaspartic acid ester, 4 parts of color paste, 2.7 parts of defoamer KMT-2053, and 1.6 parts of anti-settling agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1500 r / min, and the dispersion time was 25 min. 1.4 parts of leveling agent KMT-5502 and 3 parts of silane coupling agent γ-glycidyl etheroxypropyltrimethoxysilane were then added, and the dispersion speed was set to 500 r / min, and the dispersion time was 15 min to obtain component B. The preparation of the bio-based polyaspartic acid ester was the same as in Example 1.

[0100] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0101] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0102] Example 5

[0103] A two-component bio-based self-cleaning anti-corrosion coating for power transmission lines includes:

[0104] (1) Preparation of component A:

[0105] 71.2 parts of bio-based polyurethane prepolymer 2#, 6.13 parts of hydrotalcite, 6.5 parts of stearic acid, 5 parts of modified fumed silica, 0.17 parts of dibutyl titanate, 5 parts of substrate binder C, and 6 parts of substrate binder D were added to a sealed stirred tank. The stirring speed was set to 300 r / min, and the mixture was stirred for 20 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 2# and substrate binder C and substrate binder D were the same as in Example 4.

[0106] (2) Preparation of component B:

[0107] 85 parts of bio-based polyaspartic acid ester, 5 parts of color paste, 3 parts of defoamer KMT-2053, and 2 parts of anti-precipitation agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1200-1500 r / min, and the dispersion was carried out for 20 min. Then, 1 part of leveling agent KMT-5502 and 4 parts of γ-glycidyl etheroxypropyltrimethoxysilane were added, and the dispersion speed was set to 400 r / min, and the dispersion was carried out for 15 min to obtain component B. The preparation of the bio-based polyaspartic acid ester was the same as in Example 1.

[0108] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0109] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0110] Example 6

[0111] A two-component bio-based self-cleaning anti-corrosion coating for power transmission lines includes:

[0112] (1) Preparation of component A:

[0113] 75 parts of bio-based polyurethane prepolymer 2#, 5 parts of hydrotalcite, 8 parts of stearic acid, 4.9 parts of modified fumed silica, 0.1 parts of dibutyl titanate, 3 parts of substrate binder C, and 4 parts of substrate binder D were added to a sealed stirred tank. The stirring speed was set to 300 r / min, and the mixture was stirred for 20 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 2# and substrate binder C and substrate binder D were the same as in Example 4.

[0114] (2) Preparation of component B:

[0115] 90 parts of bio-based polyaspartic acid ester, 3 parts of color paste, 2 parts of defoamer KMT-2053, and 1 part of anti-precipitation agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1500 r / min, and the dispersion time was 20 min. 2 parts of leveling agent KMT-5502 and 2 parts of silane coupling agent γ-glycidyl etheroxypropyltrimethoxysilane were then added, and the dispersion speed was set to 400 r / min, and the dispersion time was 15 min, to obtain component B. The preparation of the bio-based polyaspartic acid ester was the same as in Example 1.

[0116] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0117] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0118] Example 7

[0119] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines differs from Example 6 in that the preparation of bio-based polyurethane prepolymer 3# in component A is different, including:

[0120] 35.22 parts castor oil and 3.9 parts bio-based glycerol were added to a four-necked flask under nitrogen protection. The temperature was set to 195°C and stirred for 2 hours. The temperature was then lowered to 80°C, and 60.8 parts bio-based pentamethylene diisocyanate and 0.08 parts dibutyltin dilaurate were added. The mixture was reacted for 2 hours to obtain bio-based polyurethane prepolymer 3#.

[0121] The other steps are the same as in Example 6.

[0122] Example 8

[0123] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0124] The preparation of component A is the same as in Example 4, except that the bio-based polyurethane prepolymer 3# prepared in Example 7 is used.

[0125] The preparation of component B is the same as that of component B in Example 5;

[0126] Preparation of a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0127] At a temperature of 15℃, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0128] Example 9

[0129] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0130] Component A uses the bio-based polyurethane prepolymer 3# prepared in Example 7, and the other steps are the same as in Example 5;

[0131] The preparation of component B is the same as that of component B in Example 7;

[0132] Preparation of a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0133] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0134] Comparative Example 1

[0135] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0136] (1) Preparation of component A

[0137] 73.8 parts of bio-based polyurethane prepolymer 1#, 8 parts of hydrotalcite, 10 parts of stearic acid, 3 parts of modified fumed silica, 0.2 parts of dibutyl titanate, 2 parts of substrate binder C, and 3 parts of substrate binder D were added to a sealed stirred tank and stirred at a speed of 300 r / min for 40 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 1#, substrate binder C, and substrate binder D are the same as in Example 1.

[0138] (2) The preparation of component B is the same as that of component B in Example 1.

[0139] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0140] At a temperature of 15℃, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0141] Comparative Example 2

[0142] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0143] (1) Preparation of component A (without substrate binder C)

[0144] 73.8 parts of bio-based polyurethane prepolymer 1#, 8 parts of hydrotalcite, 10 parts of stearic acid, 3 parts of modified fumed silica, 0.2 parts of dibutyl titanate, and 5 parts of substrate binder D were added to a sealed stirred tank and stirred at a speed of 300 r / min for 20 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 1# and substrate binder D are the same as in Example 1.

[0145] (2) The preparation of component B is the same as that of component B in Example 1.

[0146] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0147] At a temperature of 15℃, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0148] Comparative Example 3

[0149] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0150] (1) Preparation of component A (without substrate binder D)

[0151] 73.8 parts of bio-based polyurethane prepolymer 1#, 8 parts of hydrotalcite, 10 parts of stearic acid, 3 parts of modified fumed silica, 0.2 parts of dibutyl titanate, and 5 parts of substrate binder C were added to a sealed stirred tank and stirred at a speed of 200 r / min for 40 min to obtain component A. The preparation methods of bio-based polyurethane prepolymer 1# and substrate binder C are the same as in Example 1.

[0152] (2) The preparation of component B is the same as that of component B in Example 1.

[0153] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0154] At a temperature of 15℃, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0155] Comparative Example 4

[0156] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0157] (1) Preparation of component A

[0158] 36.5 parts of polyether polyol 305 and 63.45 parts of bio-based pentamethylene diisocyanate were heated to 80°C, and 0.05 parts of dibutyltin dilaurate were added. The reaction was carried out for 2 hours to obtain bio-based polyurethane prepolymer 4#.

[0159] 70 parts of bio-based polyurethane prepolymer 4#, 8 parts of hydrotalcite, 10 parts of stearic acid, 3 parts of modified fumed silica, 0.2 parts of dibutyl titanate, 3 parts of substrate binder C, and 5.8 parts of substrate binder D were added to a sealed stirred tank and stirred at a speed of 300 r / min for 40 min to obtain component A. The preparation methods of substrate binder C and substrate binder D are the same as in Example 1.

[0160] (2) The preparation of component B is the same as in Example 1;

[0161] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0162] At 25°C, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0163] Comparative Example 5

[0164] A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, comprising:

[0165] (1) The preparation method of A is the same as in Example 1;

[0166] (2) Preparation of component B:

[0167] 46.7 parts of polyetheramine D400 were added to a three-necked flask equipped with a mechanical stirrer and a thermometer. 53.3 parts of dibutyl maleate were added dropwise over 30 minutes. The mixture was stirred for 3 hours, heated to 65°C and stirred for 2 hours, and then heated to 105°C and stirred for 12 hours before stopping heating to obtain polyaspartic acid ester.

[0168] 85 parts of polyaspartic acid ester, 5 parts of color paste, 3 parts of defoamer KMT-2053, and 2 parts of anti-settling agent KMT-4006 were added to a high-speed dispersion vessel. The dispersion speed was set to 1200 r / min and the dispersion time was 25 min. Then, 1 part of leveling agent KMT-5502 and 4 parts of γ-glycidyl etheroxypropyltrimethoxysilane were added. The dispersion speed was set to 400 r / min and the dispersion time was 15 min to obtain the B component of the two-component bio-based self-cleaning anti-corrosion coating.

[0169] (3) Preparation of two-component bio-based self-cleaning anti-corrosion coating for power transmission lines:

[0170] At a temperature of 15℃, components A and B, with a mass ratio of 1:2, were mixed and stirred for 8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines.

[0171] Testing and Analysis

[0172] The self-cleaning performance of the two-component bio-based self-cleaning anti-corrosion coatings for power transmission lines prepared in Examples 1-9 and Comparative Examples 1-5 was tested, and the results are shown in Table 1:

[0173] Table 1. Performance of self-cleaning anti-corrosion coatings prepared in Examples 1-9 and Comparative Examples 1-5

[0174]

[0175] According to the test data of Examples 1-9 in Table 1, the paint film of the two-component bio-based self-cleaning anti-corrosion coating for power transmission lines has a contact angle greater than 150° and a roll-off angle less than 10°, meeting the superhydrophobic requirements. The contact angle and roll-off angle of the paint film after 1500 hours of UVB testing also met the self-cleaning requirements. The adhesion and abrasion resistance of the paint film on the substrate surface were also tested. The adhesion of the paint film to the substrate was greater than 9 MPa, and the adhesion did not change significantly before and after aging. The abrasion resistance of the paint film was excellent, as tested using an abrasion tester.

[0176] Compared to Example 1, Comparative Examples 1, 2, and 3 reduced the amount of substrate binder C or D, resulting in decreased adhesion of the paint film to the substrate surface and worsened weather resistance. This indicates that substrate binders C and D not only improve the adhesion between the paint film and the substrate but also enhance UV weather resistance. This is because substrate binders C and D possess multiple benzene rings and phenolic hydroxyl groups, forming larger hard segments that form hydrogen bonds with the substrate surface, thereby improving interlayer adhesion.

[0177] Compared to the polyether-type polyurethane prepolymer of Comparative Example 4, the coating film prepared by the self-made bio-based polyurethane prepolymer in Example 1 exhibits superior weather resistance and low surface energy, resulting in a large contact angle and a small roll-off angle. Since the self-made bio-based polyurethane prepolymer lacks ether bonds, and the carbon chains on the castor oil molecules can block ultraviolet light irradiation and prevent main chain damage, the self-cleaning anti-corrosion coating prepared using the self-made bio-based polyurethane prepolymer demonstrates excellent weather resistance.

[0178] Compared with the polyether-type polyaspartic acid ester resin of Comparative Example 5, the self-made bio-based polyaspartic acid ester resin of Example 1 has similar weather resistance and wear resistance. The paint film made by the self-made bio-based polyaspartic acid ester has low surface energy, which is beneficial for preparing superhydrophobic and self-cleaning coatings. This is because 2-octanol and octadecyl alcohol have long carbon chains and excellent hydrophobic properties.

[0179] In summary, the data above shows that the synergistic effect of substrate adhesives C and D not only improves the bonding strength between the coating and the substrate but also enhances weather resistance. The coating film obtained by reacting the prepared bio-based polyurethane prepolymer with bio-based polyaspartic acid ester exhibits excellent superhydrophobic and self-cleaning properties. Furthermore, the use of bio-based raw materials in coating preparation promotes energy conservation and emission reduction, fundamentally eliminating the risk of icing on power transmission lines compared to conventional de-icing and self-heating de-icing methods.

[0180] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of the present invention.

Claims

1. A two-component bio-based self-cleaning anti-corrosion coating for power transmission lines, characterized in that, Includes component A and component B with a mass ratio of 1:1-2; Component A, by mass fraction, consists of the following components: 70-75 parts of bio-based polyurethane prepolymer, 5-8 parts of hydrotalcite, 6-10 parts of stearic acid, 3-5 parts of modified fumed silica, 0.1-0.2 parts of dibutyl titanate, 3-5 parts of substrate adhesive C, and 4-6 parts of substrate adhesive D. The bio-based polyurethane prepolymer is prepared from the following raw materials in parts by weight: Bio-based pentamethylene diisocyanate 61-66 parts, bio-based glycerin 3.5-4.5 parts, castor oil 32-37 parts, dibutyltin dilaurate 0.05-0.1 parts; The substrate adhesive C, by weight, is prepared from the following raw materials: 52.5-55.3 parts of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 44.2-47.1 parts of isophorone diisocyanate, and 0.3-0.5 parts of dibutyltin dilaurate; The substrate adhesive D is prepared from the following raw materials in parts by weight: Octyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate 66.5-68.7 parts, isophthalic acid diisocyanate 30.7-33.3 parts, dibutyltin dilaurate 0.2-0.6 parts; Component B, by mass fraction, consists of the following components: 85-90 parts of bio-based polyaspartic acid ester, 3-5 parts of color paste, 2-3 parts of defoamer, 1-2 parts of leveling agent, 1-2 parts of anti-settling agent, and 2-4 parts of silane coupling agent. The bio-based polyaspartic acid ester is prepared from the following raw materials in parts by weight: Bio-based glycerol 7.2-7.9 parts, maleic anhydride 22.8-25.6 parts, bio-based 2-octanol 20.1-22.7 parts, octadecyl alcohol 20.5-22.7 parts, cyclohexylamine 22.5-25.8 parts.

2. The two-component bio-based self-cleaning anti-corrosion coating for power transmission lines according to claim 1, characterized in that, The modified fumed silica is one or more of KP-15, aerosil r202, qs-102, and H15.

3. The two-component bio-based self-cleaning anti-corrosion coating for power transmission lines according to claim 1, characterized in that, The silane coupling agent is one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, and 3-(2-aminoethylamino)propyltrimethoxysilane; the leveling agent is one or more of KMT-5502, BYK-354, and Glide410.

4. The two-component bio-based self-cleaning anti-corrosion coating for power transmission lines according to claim 1, characterized in that, One or more of the following defoamers: KMT-2053, BYK-054, and Airex 920.

5. The two-component bio-based self-cleaning anti-corrosion coating for power transmission lines according to claim 1, characterized in that, One or more of the following anti-settling additives: KMT-4006, RHEOBYK-411, and BP-186.

6. A method for preparing a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines according to claim 1 or 2, characterized in that, include: At a temperature of 15-35℃, components A and B are mixed and stirred for 5-8 minutes to remove bubbles, resulting in a two-component bio-based self-cleaning anti-corrosion coating for power transmission lines. The preparation method of component A includes the following steps: Bio-based polyurethane prepolymer, hydrotalcite, stearic acid, modified fumed silica, dibutyl titanate, substrate binder C, and substrate binder D are added to a sealed mixing tank. The stirring speed is set to 200-300 r / min, and the mixture is stirred for 20-40 min to obtain component A. The preparation method of component B is as follows: Bio-based polyaspartic acid ester, color paste, defoamer, and anti-precipitation agent are added to a high-speed dispersion vessel. The dispersion speed is set to 1200-1500 r / min, and the dispersion time is 20-25 min. Then, a leveling agent is added, and the dispersion speed is set to 400-500 r / min. The dispersion time is 10-15 min to obtain component B.

7. The preparation method according to claim 6, characterized in that, The preparation method of the bio-based polyurethane prepolymer includes: adding castor oil and bio-based glycerol into a four-necked flask with nitrogen protection, setting the temperature to 195-215℃, stirring for 2 hours, cooling to 80-85℃, adding bio-based pentamethylene diisocyanate and dibutyltin dilaurate as catalyst, and reacting for 2-3 hours to obtain the bio-based polyurethane prepolymer.

8. The preparation method according to claim 6, characterized in that, The preparation method of the substrate adhesive C includes the following steps: 1,3,5-Trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene and isophorone diisocyanate were added to a three-necked flask equipped with a mechanical stirrer and a thermometer at a molar ratio of 1:3 and mixed thoroughly. The mixture was heated to 80°C, and dibutyltin dilaurate catalyst was added. The mixture was then heated to 90-95°C and reacted for 2.5-3 hours to obtain substrate adhesive C.

9. The preparation method according to claim 6, characterized in that, The preparation method of the substrate adhesive D includes the following steps: Octyl alcohol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and isophthalic acid diisocyanate were added to a three-necked flask equipped with a mechanical stirrer and a thermometer, mixed evenly, and the temperature was set to 80-85℃. After dissolution, dibutyltin dilaurate was added, and the mixture was stirred at 90-95℃ for 2.5-3 hours to obtain substrate adhesive D.

10. The preparation method according to claim 6, characterized in that, The preparation method of the bio-based polyaspartic acid ester includes the following steps: Bio-based glycerol and maleic anhydride were added to a nitrogen-filled, distillation-graded four-necked flask. The temperature was set to 60-65℃, then raised to 95-100℃ and held for 1 hour. Under nitrogen protection, bio-based 2-octanol and octadecyl alcohol were added. The temperature was raised to 195-205℃ and held for 2.5-3 hours, then raised to 220-225℃ and held for 1-1.5 hours. The acid value was measured and stopped when it dropped to 5 mg KOH / g. The temperature was lowered to 40-45℃, and cyclohexylamine was added dropwise over 30-35 minutes. The mixture was stirred for 3 hours, then raised to 60-65℃ and stirred for 2 hours. The temperature was then raised to 105℃ and stirred for 12-15 hours before the mixture was stopped, yielding bio-based polyaspartic acid ester.

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