Coating for protecting prestressed steel wire rope and construction method

Abstract

The invention relates to a coating for protecting a prestressed steel wire rope and a construction method, the coating comprises a coating I and a coating II, the coating I comprises epoxy resin, a diluent, an auxiliary agent, a filler, a curing agent and a coupling agent, and the coating II comprises polyurethane modified nano aluminum oxide, modified nano titanium dioxide and diepoxypropane ethyl ether. The coating I is reasonably proportioned, so that the adhesive force, the flexibility and the corrosion resistance of the steel wire rope are improved, and basic protection is provided for the steel wire rope; and the coating II adopts polyurethane modified nano aluminum oxide, modified nano titanium dioxide and diepoxypropane ethyl ether to form a wear-resistant and weather-resistant surface layer, so that the hardness, wear resistance and aging resistance of the steel wire rope are enhanced. A multi-stage chemical crosslinking structure is formed between the surface of the steel wire rope and the coating, so that the adhesive force, the flexibility, the wear resistance and the corrosion resistance are synergistically improved, and the coating is suitable for long-acting protection of the prestressed steel wire rope.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and specifically to a coating and application method for protecting prestressed steel wire ropes. Background Technology

[0002] In applications such as flexible photovoltaic (PV) systems, prestressed steel wire ropes play a crucial supporting role. However, prestress loss in these wire ropes is a serious problem, potentially leading to damage to PV panels in harsh environments such as strong winds. Corrosion of the wire ropes is one of the major causes of prestress loss. Traditional wire rope protection methods are ineffective in handling complex environments and long-term use. Currently, traditional protective coating materials have significant shortcomings in addressing the unique working conditions of prestressed steel wire ropes. On one hand, they cannot adequately adapt to the deformation of prestressed steel wire ropes during use, easily leading to coating cracking and peeling, thus exposing the wire rope directly to the external environment and accelerating corrosion. On the other hand, existing coatings have limited ability to block ultraviolet (UV) radiation, which accelerates the aging of coating materials and reduces their protective performance. Furthermore, existing construction methods for coating prestressed steel wire ropes suffer from low construction efficiency and unstable coating quality.

[0003] Therefore, developing a coating that can effectively protect prestressed steel wire ropes, adapt to their deformation, and is easy and efficient to construct is of great practical significance. Summary of the Invention

[0004] To address the problems mentioned in the background art, the main objective of this invention is to provide a coating and construction method for protecting prestressed steel wire ropes. This invention, through a double-layer coating design, achieves long-term protection of the steel wire rope coating under environments such as dynamic friction, salt spray, and ultraviolet radiation, significantly extending the coating's service life.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A coating for protecting prestressed steel wire rope includes coating I and coating II. Coating I is obtained by applying coating I to the surface of the steel wire rope and then drying and curing it. Coating II is obtained by applying coating II to coating I on the surface of the steel wire rope and then drying and curing it.

[0006] Preferably, the coating I comprises the following components in parts by weight: 40-50 parts epoxy resin, 5-15 parts toughening agent, 10-20 parts epoxy reactive diluent, 40-50 parts filler, 2-5 parts additives, 1.5-3.5 parts nanomaterials, 40-50 parts curing agent, and 2-5 parts silane coupling agent. The coating II comprises the following components in parts by weight: 15-25 parts of polyurethane modified nano alumina, 18-30 parts of modified nano titanium dioxide, and 5-10 parts of diepoxypropane ethyl ether.

[0007] Preferably, the epoxy resin includes at least one of phenolic epoxy resin, bisphenol S type epoxy resin, bisphenol A type epoxy resin, or bisphenol F type epoxy resin.

[0008] Preferably, the epoxy reactive diluent includes at least one of dodecyl to tetradecyl glycidyl ether, propylene oxide benzyl ether, ethylene glycol glycidyl ether, propylene oxide butyl ether, or dipropylene oxide ethyl ether.

[0009] Preferably, the toughening agent includes at least one of polysulfide rubber, nitrile rubber, or polypropylene glycol diglycidyl ether.

[0010] Preferably, the filler comprises at least one of precipitated barium sulfate, basalt flakes, aluminum tripolyphosphate, zinc phosphate, mica iron oxide, mica powder, ceramic powder, or calcium exchange SiO2.

[0011] Preferably, the additives include at least one of dispersants, defoamers, or leveling agents.

[0012] The dispersant includes at least one of BYK-9076, BYK-9077, or BYK-180.

[0013] The defoamer includes at least one of BYK-A530, BYK-A500, BYK-A555, or BYK-141 defoamer.

[0014] The leveling agent includes at least one of BYK-405, BYK-411, or BYK-410.

[0015] Preferably, the nanomaterial includes at least one of organomontmorillonite, graphene nanosheets, carbon nanotubes, nano-silica, or nano-zinc oxide.

[0016] Preferably, the silane coupling agent comprises at least one of γ-aminopropyltrimethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, or 3-aminopropyltriethoxysilane.

[0017] Preferably, the curing agent includes at least one of polyamide curing agents, polyetheramine curing agents, aliphatic amine curing agents, and cycloaliphatic amine curing agents.

[0018] Preferably, the modified nano-alumina is prepared by the following method: (1) Mix toluene diisocyanate and polyethylene glycol PEG400 evenly and react at 70-90℃ for 1-2 hours to generate terminal isocyanate prepolymer; (2) Dissolve nano-Al2O3 in dimethylformamide, add terminal isocyanate prepolymer, stir at 60-80℃ for 4-6 hours, wash and dry to obtain polyurethane modified alumina.

[0019] Preferably, the mass ratio of toluene isocyanate to polyethylene glycol is 1-2:1; The mass ratio of the nano-Al2O3 to the terminal isocyanate prepolymer is 1:0.1-0.3.

[0020] Preferably, the modified nano-titanium dioxide is benzotriazole-coated nano-titanium dioxide, and the preparation method is as follows: (1) Modification of benzotriazole: Benzotriazole and γ-aminopropyltriethoxysilane were dissolved in toluene, and dibutyltin dilaurate was added. After reflux reaction at 70-90℃, modified benzotriazole was obtained. (2) Tetrabutyl titanate was slowly added dropwise to ethanol and stirred to form a transparent solution. Deionized water was added dropwise while nitric acid was added to adjust the pH. Stirring was continued for 2 hours to generate TiO2 sol. The sol was reacted at 150-200℃. After the reaction was completed, nano-TiO2 core particles were obtained. (3) Dissolve the activated TiO2 core particles in ethanol, add modified benzotriazole, disperse by ultrasonication, and stir to obtain benzotriazole-grafted TiO2.

[0021] Preferably, the mass ratio of benzotriazole, γ-aminopropyltriethoxysilane, dibutyltin dilaurate, and toluene is 1:1.3-1.7:0.18-0.20:20-30; The mass ratio of the modified benzotriazole to TiO2 core particles is 1:5-8.

[0022] On the other hand, the present invention provides a method for applying a coating to protect prestressed steel wire ropes, comprising the following steps: After mixing epoxy resin, toughening agent and diluent, add dispersant, leveling agent and defoamer and mix. Then add filler and nanomaterials and mix evenly. Finally add curing agent and silane coupling agent and mix evenly to obtain coating I. Coating I is evenly coated on the surface of the steel wire rope and dried and cured to obtain a steel wire rope with coating I on the surface. Polyurethane-modified nano-alumina, modified nano-titanium dioxide, and diglycidyl ether are stirred and mixed evenly to obtain coating II. Coating II is then evenly applied onto coating I on the surface of the wire rope, and after drying and curing, a wire rope with coatings I and II on its surface is obtained.

[0023] In the above construction method, the silane coupling agent of coating I reacts with the surface of the wire rope and the epoxy resin. Through the coating-curing process during construction, chemical bonds are formed at the interface, improving the adhesion between the substrate and coating I, and preventing peeling even under long-term alternating stress. The polyurethane-modified nano-alumina of coating II can fill the micropores with the coating flow during coating, and forms a wear-resistant structure after curing, improving the wear resistance of coating II. The benzotriazole-coated nano-titanium dioxide, during construction, has a high UV absorption of benzotriazole and a photocatalytic stabilizing effect of TiO2, synergistically improving the anti-aging performance of the coating. The layered construction method of coating I and coating II avoids the functional conflict of single coatings. At the same time, the double-layer coating process is simple, compatible with existing wire rope production lines, and does not require large-scale equipment modification, ultimately achieving a comprehensive improvement in the protective performance, construction efficiency, and industrial adaptability of prestressed wire rope coatings.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. The coating I of this invention is based on epoxy resin, combined with the synergistic effect of multifunctional fillers such as graphene and aluminum tripolyphosphate, as well as toughening agents and curing agents, to chemically react and physically adsorb with the surface of the steel wire rope, forming a tight adhesion layer that isolates the steel wire rope from the external environment, thereby improving the adhesion, flexibility and corrosion resistance of coating I. Coating II uses polyurethane-modified nano-Al2O3 to avoid the agglomeration of nanomaterials and improve dispersibility. The polyurethane segments crosslink with the matrix, improving the hardness and flexibility of the coating. By grafting γ-aminopropylsilane-modified benzotriazole onto TiO2, the photodegradation of benzotriazole is prevented, achieving long-term ultraviolet shielding. The dense arrangement of nano-modified components improves the hardness, wear resistance and anti-aging properties of coating II.

[0025] 2. This invention significantly improves coating adhesion by forming a cross-linked structure between the aminosilane coupling agent and the steel wire rope surface and epoxy resin. In coating I, the curing agent and epoxy resin cross-link to form a dense network structure, with mica iron oxide arranging to construct a "maze-like" physical barrier, synergistically enhancing the coating's corrosion resistance with the rust-inhibiting filler. Between coating I and coating II, the residual -NCO groups of polyurethane-modified nano-Al2O3 covalently bond with the hydroxyl or amino groups in the epoxy resin network, forming an interpenetrating molecular structure and mitigating the risk of interlayer delamination. In coating II, benzotriazole is grafted into the nano-TiO2 core via Si-O-Ti bonds, and its organic segments are embedded in the polyurethane chain extender network, ensuring long-term fixation of the UV absorber and improving the coating's anti-aging properties. This invention, through the cross-linked structure formed between the coating structures, gives the coating both excellent mechanical properties and environmental durability, providing comprehensive protection for the steel wire rope.

[0026] 3. Through the structural design of strong bonding at the bottom layer and wear-resistant and weather-resistant surface layer, this invention achieves long-term protection of the wire rope coating under dynamic friction, salt spray, ultraviolet radiation and other environments, which greatly improves the service life of the coating.

[0027] 4. This invention employs a step-by-step construction method with coating I and coating II. Coating I serves as the base layer, and through the synergistic effect of epoxy resin, toughening agent, nanomaterials, and coupling agent, it enhances the adhesion between the substrate and the coating, providing basic protection for the wire rope. Coating II serves as the top layer, and through the synergistic effect of polyurethane-modified nano-alumina and benzotriazole-coated nano-titanium dioxide, it improves the wear resistance and anti-aging properties of the wire rope surface, significantly extending its outdoor service life. The interaction between coating I and coating II provides prestressed wire ropes with long-term protection characterized by "dynamic adaptation, wear and weather resistance, and long-term stability," making it particularly suitable for complex outdoor working conditions such as flexible photovoltaic supports, and possessing significant technical and economic value. Attached Figure Description

[0028] Figure 1 This is a flowchart of the construction method of the present invention. Detailed Implementation

[0029] To more clearly illustrate the present invention and to gain a clearer understanding of its technical features, objectives, and beneficial effects, the technical solution of the present invention will now be described in detail below, but this should not be construed as limiting the scope of the present invention.

[0030] This invention employs a dual-coating system to protect steel wire ropes. In coating I, one end of the silane coupling agent forms a covalent bond with the hydroxyl groups on the surface of the steel wire rope matrix, while the other end reacts with the epoxy groups of the epoxy resin. The chemical bonding between coating I and the steel wire rope surface significantly enhances adhesion. The toughening agent introduces elastic segments into the epoxy resin crosslinking network. When the steel wire rope is subjected to prestressed tension or bending, these flexible segments absorb stress through plastic deformation, preventing rigid cracking. Nanomaterials hinder microcrack propagation through a "crack bridging effect" and improve the coating's impact resistance. The addition of fillers forms a physical barrier through "layered stacking," extending the penetration path of corrosive media. Meanwhile, the active... Fillers (such as aluminum tripolyphosphate and zinc phosphate) release corrosion-inhibiting ions when the coating is damaged, forming a passivation film to inhibit the corrosion of the wire rope. Polyurethane-modified nano-alumina is used in coating II, which not only improves the surface wear resistance, but also buffers frictional stress through polyurethane segments to avoid hard and brittle cracking. The high UV absorption of benzotriazole and the photocatalytic stabilization of TiO2 work together to resist outdoor UV aging and avoid cracking and chalking of traditional coatings caused by UV. The epoxy groups of the reactive diluent in coating II can react with the unreacted hydroxyl or amino groups in coating I, and are also compatible with the polyurethane groups in coating II, achieving chemical bonding between coatings and avoiding interlayer delamination.

[0031] This invention solves the problems of "dynamic stress cracking, interface detachment, corrosion aging, and wear failure" faced by prestressed steel wire ropes in scenarios such as flexible photovoltaic supports by strengthening the bottom layer adhesion and toughness regulation, enhancing the surface layer function, and achieving interlayer synergy through chemical anchoring of the two layers. It significantly extends the service life of the steel wire rope and provides an efficient protection solution for prestressed structures in complex environments.

[0032] The following specific embodiments further illustrate the technical solution of the present invention.

[0033] Example 1: A coating for protecting prestressed steel wire rope includes coating I and coating II. Coating I comprises the following components in parts by weight: 45 parts of bisphenol A type epoxy resin E51, 10 parts of D-1217, 15 parts of tetradecyl glycidyl ether, 16 parts of barium sulfate, 12 parts of ceramic powder, 6 parts of aluminum tripolyphosphate, 4 parts of zinc phosphate, 7 parts of mica iron oxide, 1.3 parts of BYK-180, 1 part of BYK-A530, 1 part of BYK-405, 2 parts of graphene nanosheets, 45 parts of polyamide curing agent, and 3.5 parts of γ-aminopropyltrimethoxysilane. The coating II comprises the following components in parts by weight: 20 parts of polyurethane modified nano alumina, 24 parts of modified nano titanium dioxide, and 8 parts of diglycidyl ether. like Figure 1 As shown, the construction method for the coating used to protect prestressed steel wire rope includes the following steps: S1. Epoxy resin E51, toughening agent D-1217, and tetradecyl glycidyl ether are stirred and mixed evenly. BYK-180, BYK-A530, and BYK-405 are added and stirred and mixed evenly. Then, barium sulfate, ceramic powder, aluminum tripolyphosphate, zinc phosphate, mica iron oxide, and graphene nanosheets are added and stirred and mixed evenly. The mixture is then filtered through an 80-mesh sieve to obtain the first component. Finally, the second component, formed by the evenly mixed polyamide curing agent and γ-aminopropyltrimethoxysilane, is added at a ratio of 1:0.25. After stirring and mixing evenly, coating I is obtained. Coating I is evenly applied to the surface of the steel wire rope and dried and cured to obtain a steel wire rope with coating I on the surface. S2. Polyurethane-modified nano-alumina, modified nano-titanium dioxide and diglycidyl ether are stirred and mixed evenly to obtain coating II. Coating II is evenly coated on coating I on the surface of the wire rope. After drying and curing, a wire rope with coatings I and II on the surface is obtained. The thickness ratio of coating I and II is 15.69:6.27.

[0034] The modified nano-alumina is prepared as follows: (1) Mix 30g toluene diisocyanate and 20g polyethylene glycol PEG400 evenly and react at 80℃ for 1.5h to generate terminal isocyanate prepolymer; (2) Dissolve 1g of nano Al2O3 in 25ml of dimethylformamide, add 0.15g of terminal isocyanate prepolymer, stir at 70℃ for 5h, wash and dry to obtain polyurethane modified alumina.

[0035] The modified nano-titanium dioxide is benzotriazole-coated nano-titanium dioxide, and the preparation method is as follows: (1) Under nitrogen protection, 10g of benzotriazole and 15g of γ-aminopropyltriethoxysilane were dissolved in 250g of toluene, and 1.9g of dibutyltin dilaurate was added. After refluxing at 80℃ for 4h, the toluene was removed by vacuum distillation of the reaction solution to obtain amino-modified benzotriazole. (2) Tetrabutyl titanate was slowly added dropwise to ethanol. After stirring to form a transparent solution, deionized water was added dropwise, and nitric acid was added dropwise to adjust the pH to 3. Stirring was continued for 2 hours to generate TiO2 sol. The sol was reacted at 180℃ for 12 hours. The reaction solution was centrifuged, washed and dried to obtain nano-TiO2 core particles. (3) Take 14g of activated TiO2 core particles and dissolve them in ethanol. Add 2g of modified benzotriazole, disperse by ultrasonication, stir at 60℃ for 6h, centrifuge, wash and dry to obtain modified benzotriazole grafted TiO2.

[0036] Example 2: A coating for protecting prestressed steel wire rope includes coating I and coating II. Coating I comprises the following components in parts by weight: 40 parts of bisphenol A type epoxy resin E51, 5 parts of D-1217, 10 parts of tetradecyl glycidyl ether, 14 parts of barium sulfate, 11 parts of ceramic powder, 5 parts of aluminum tripolyphosphate, 4 parts of zinc phosphate, 6 parts of calcium exchange SiO2, 0.7 parts of BYK-9076, 0.6 parts of BYK-A500, 0.7 parts of BYK-411, 1.5 parts of organomontmorillonite, 40 parts of polyamide curing agent, and 2.8 parts of γ-aminopropyltrimethoxysilane. The coating II comprises the following components in parts by weight: 16 parts of polyurethane modified nano alumina, 18 parts of modified nano titanium dioxide, and 5 parts of diglycidyl ether. The construction method for the coating used to protect prestressed steel wire rope includes the following steps: S1. Epoxy resin E51, toughening agent D-1217, and tetradecyl glycidyl ether are stirred and mixed evenly. BYK-9076, BYK-A500, and BYK-411 are added and stirred and mixed evenly. Then, barium sulfate, ceramic powder, aluminum tripolyphosphate, zinc phosphate, calcium exchange SiO2, and organomontmorillonite are added and stirred and mixed evenly. The mixture is then filtered through an 80-mesh sieve to obtain the first component. Finally, the second component, formed by the evenly mixed polyamide curing agent and γ-aminopropyltrimethoxysilane, is added at a ratio of 1:0.3. After stirring and mixing evenly, coating I is obtained. Coating I is evenly applied to the surface of the wire rope and dried and cured to obtain a wire rope with coating I on the surface. S2. Polyurethane-modified nano-alumina, modified nano-titanium dioxide and diglycidyl ether are stirred and mixed evenly to obtain coating II. Coating II is evenly coated on coating I on the surface of the wire rope. After drying and curing, a wire rope with coatings I and II on the surface is obtained. The thickness ratio of coating I and II is 15.49:6.18.

[0037] The modified nano-alumina is prepared as follows: (1) Mix 20g toluene diisocyanate and 20g polyethylene glycol PEG400 evenly and react at 80℃ for 1h to generate terminal isocyanate prepolymer. (2) Dissolve 1g of nano Al2O3 in 25ml of dimethylformamide, add 0.12g of terminal isocyanate prepolymer, stir at 70℃ for 5h, wash and dry to obtain polyurethane modified alumina.

[0038] The modified nano-titanium dioxide is benzotriazole-coated nano-titanium dioxide, and the preparation method is as follows: (1) Under nitrogen protection, 10g of benzotriazole and 14g of γ-aminopropyltriethoxysilane were dissolved in 220g of toluene, and 1.8g of dibutyltin dilaurate was added. After refluxing at 80℃ for 4h, the toluene was removed by vacuum distillation of the reaction solution to obtain amino-modified benzotriazole. (2) Tetrabutyl titanate was slowly added dropwise to ethanol. After stirring to form a transparent solution, deionized water was added dropwise, and nitric acid was added dropwise to adjust the pH to 3. Stirring was continued for 2 hours to generate TiO2 sol. The sol was reacted at 180℃ for 12 hours. The reaction solution was centrifuged, washed and dried to obtain nano-TiO2 core particles. (3) Take 10g of activated TiO2 core particles and dissolve them in ethanol. Add 2g of modified benzotriazole, disperse by ultrasonication, stir at 60℃ for 6h, centrifuge, wash and dry to obtain modified benzotriazole grafted TiO2.

[0039] Example 3: A coating for protecting prestressed steel wire rope includes coating I and coating II. Coating I comprises the following components in parts by weight: 50 parts of bisphenol A type epoxy resin E51, 15 parts of D-1217, 20 parts of tetradecyl glycidyl ether, 18 parts of barium sulfate, 13 parts of mica powder, 7 parts of aluminum tripolyphosphate, 5 parts of zinc phosphate, 7 parts of mica iron oxide, 2 parts of BYK-180, 1.5 parts of BYK-530, 1.5 parts of BYK-405, 3 parts of carbon nanotubes, 50 parts of polyamide curing agent, and 5 parts of γ-aminopropyltrimethoxysilane. The coating II comprises the following components in parts by weight: 25 parts polyurethane modified nano alumina, 30 parts modified nano titanium dioxide, and 10 parts diglycidyl ether. The method for preparing the coating for protecting prestressed steel wire rope includes the following steps: S1. Epoxy resin E51, toughening agent D-1217, and tetradecyl glycidyl ether are stirred and mixed evenly. BYK-180, BYK-530, and BYK-405 are added and stirred and mixed evenly. Then, barium sulfate, mica powder, aluminum tripolyphosphate, zinc phosphate, mica iron oxide, and carbon nanotubes are added and stirred and mixed evenly. The mixture is then filtered through an 80-mesh sieve to obtain the first component. Finally, the second component, formed by the evenly mixed polyamide curing agent and γ-aminopropyltrimethoxysilane, is added at a ratio of 1:0.2. After stirring and mixing evenly, coating I is obtained. Coating I is evenly applied to the surface of the steel wire rope and dried and cured to obtain a steel wire rope with coating I on the surface. S2. Polyurethane-modified nano-alumina, modified nano-titanium dioxide and diglycidyl ether are stirred and mixed evenly to obtain coating II. Coating II is evenly coated on coating I on the surface of the wire rope. After drying and curing, a wire rope with coatings I and II on the surface is obtained. The thickness ratio of coating I and II is 15.95:6.38.

[0040] The modified nano-alumina is prepared as follows: (1) Mix 40g of toluene diisocyanate and 20g of polyethylene glycol PEG400 evenly and react at 80℃ for 2h to generate terminal isocyanate prepolymer. (2) Dissolve 1g of nano Al2O3 in 25ml of dimethylformamide, add 0.2g of terminal isocyanate prepolymer, stir at 70℃ for 5h, wash and dry to obtain polyurethane modified alumina.

[0041] The modified nano-titanium dioxide is benzotriazole-coated nano-titanium dioxide, and the preparation method is as follows: (1) Under nitrogen protection, 10g of benzotriazole and 17g of γ-aminopropyltriethoxysilane were dissolved in 300g of toluene, and 2g of dibutyltin dilaurate was added. After refluxing at 80℃ for 4h, the toluene was removed by vacuum distillation of the reaction solution to obtain amino-modified benzotriazole. (2) Tetrabutyl titanate was slowly added dropwise to ethanol. After stirring to form a transparent solution, deionized water was added dropwise, and nitric acid was added dropwise to adjust the pH to 3. Stirring was continued for 2 hours to generate TiO2 sol. The sol was reacted at 180℃ for 12 hours. The reaction solution was centrifuged, washed and dried to obtain nano-TiO2 core particles. (3) Take 16g of activated TiO2 core particles and dissolve them in ethanol. Add 2g of modified benzotriazole, disperse by ultrasonication, stir at 60℃ for 6h, centrifuge, wash and dry to obtain modified benzotriazole grafted TiO2.

[0042] Comparative Example 1: The comparative example is basically the same as Example 1, except that unmodified nano-alumina is used.

[0043] Comparative Example 2: The comparative example is basically the same as Example 1, except that unmodified nano-titanium dioxide is used.

[0044] Comparative Example 3: The comparative example is basically the same as Example 1, except that unmodified nano-alumina and nano-titanium dioxide are used.

[0045] The performance of the coated steel wire ropes prepared in the above embodiments and comparative examples was tested, and the structural steel is shown in Table 1.

[0046] Table 1

[0047] As shown in Table 1, Comparative Examples 1-2, and the Examples, the comparative examples, using unmodified nano-alumina and titanium dioxide, exhibited reduced wear resistance, corrosion resistance, and aging resistance of the coating. In contrast, the Examples, employing silane-modified nano-alumina and silane-modified benzotriazole-grafted nano-titanium dioxide, significantly improved these properties. This invention enhances adhesion through interfacial chemical reactions, synergistic performance improvement through functional materials, and layered construction, thereby improving the adhesion, impact resistance, wear resistance, weather resistance, corrosion resistance, and aging resistance of prestressed steel wire ropes, resulting in significant economic benefits.

[0048] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A coating for protecting prestressed steel wire rope, characterized in that, It includes coating I and coating II. Coating I is obtained by applying paint I to the surface of the wire rope and then drying and curing it. Coating II is obtained by applying coating II onto coating I on the surface of the wire rope and then drying and curing it.

2. The coating for protecting prestressed steel wire rope according to claim 1, characterized in that, The coating I comprises the following components in parts by weight: 40-50 parts epoxy resin, 5-15 parts toughening agent, 10-20 parts epoxy reactive diluent, 40-50 parts filler, 2-5 parts additives, 1.5-3.5 parts nanomaterials, 40-50 parts curing agent, and 2-5 parts silane coupling agent. The coating II comprises the following components in parts by weight: 15-25 parts of polyurethane modified nano alumina, 18-30 parts of modified nano titanium dioxide, and 5-10 parts of diepoxypropane ethyl ether.

3. The coating for protecting prestressed steel wire rope according to claim 2, characterized in that, The epoxy resin includes at least one of phenolic epoxy resin, bisphenol S type epoxy resin, bisphenol A type epoxy resin, or bisphenol F type epoxy resin; the epoxy reactive diluent includes at least one of dodecyl to tetradecyl glycidyl ether, propylene oxide benzyl ether, ethylene glycol glycidyl ether, propylene oxide butyl ether, or dipropylene oxide ethyl ether; the curing agent includes at least one of polyamide curing agent, polyetheramine curing agent, aliphatic amine curing agent, or alicyclic amine curing agent.

4. The coating for protecting prestressed steel wire rope according to claim 2, characterized in that, The nanomaterials include at least one of organomontmorillonite, graphene nanosheets, carbon nanotubes, nano-silica, or nano-zinc oxide.

5. The coating for protecting prestressed steel wire rope according to claim 2, characterized in that, The coupling agent includes at least one of γ-aminopropyltrimethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, or 3-aminopropyltriethoxysilane.

6. The coating for protecting prestressed steel wire rope according to claim 2, characterized in that, The modified nano-alumina is prepared as follows: (1) Mix toluene diisocyanate and polyethylene glycol PEG400 evenly and react at 70-90℃ for 1-2 hours to generate terminal isocyanate prepolymer; (2) Dissolve nano-Al2O3 in dimethylformamide, add terminal isocyanate prepolymer, stir at 60-80℃ for 4-6 hours, wash and dry to obtain polyurethane modified alumina.

7. The coating for protecting prestressed steel wire rope according to claim 6, characterized in that, The mass ratio of toluene isocyanate to polyethylene glycol is 1-2:1; the mass ratio of nano-Al2O3 to terminal isocyanate prepolymer is 1:0.1-0.

3.

8. The coating for protecting prestressed steel wire rope according to claim 2, characterized in that, The modified nano-titanium dioxide is benzotriazole-coated nano-titanium dioxide, and the preparation method is as follows: (1) Modification of benzotriazole: Add dibutyltin dilaurate to toluene containing benzotriazole and γ-aminopropyltriethoxysilane, and reflux at 70-90℃ to obtain modified benzotriazole. (2) Tetrabutyl titanate was slowly added dropwise to ethanol and stirred to form a transparent solution. Then, deionized water was added dropwise while nitric acid was added to adjust the pH. Stirring was continued for 2 hours to generate TiO2 sol. The sol was reacted at 150-200℃. After the reaction was completed, nano-TiO2 core particles were obtained. (3) Dissolve the activated TiO2 core particles in ethanol, add modified benzotriazole, disperse by ultrasonication, and stir to obtain benzotriazole-coated TiO2.

9. The coating for protecting prestressed steel wire rope according to claim 8, characterized in that, The mass ratio of benzotriazole, γ-aminopropyltriethoxysilane, dibutyltin dilaurate and toluene is 1:1.3-1.7:0.18-0.20:20-30; the mass ratio of modified benzotriazole to TiO2 core particles is 1:5-8.

10. The construction method for protecting the coating of prestressed steel wire rope according to any one of claims 2-9, characterized in that, Includes the following steps: After mixing epoxy resin, toughening agent and diluent, add dispersant, leveling agent and defoamer and mix. Then add filler and nanomaterials and mix evenly. Finally add curing agent and coupling agent and mix evenly to obtain coating I. Apply coating I evenly to the surface of the wire rope and dry and cure to obtain a wire rope with coating I on the surface. Polyurethane-modified nano-alumina, modified nano-titanium dioxide, and diglycidyl ether are stirred and mixed evenly to obtain coating II. Coating II is then evenly applied onto coating I on the surface of the wire rope, and after drying and curing, a wire rope with coatings I and II on its surface is obtained.

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