Tensile steel core aluminium strand

Abstract

This invention discloses a tensile-strength steel-cored aluminum stranded wire, relating to the technical field of steel-cored aluminum stranded wire. The tensile-strength steel-cored aluminum stranded wire of this invention comprises at least: a steel core; a Zn-Ni-WC composite coating, electroplated on the steel core; aluminum strands, stranded on the steel core coated with the Zn-Ni-WC composite coating; and an anti-corrosion coating applied to the stranded aluminum strands. The anti-corrosion coating comprises the following raw materials in parts by weight: 60-70 parts of long-chain modified polyurethane acrylate prepolymer; 25-30 parts of acrylate isoborneol ester; 15-20 parts of dopamine-modified sustained-release microcapsules; 2-5 parts of photoinitiator; 0.5-1.5 parts of leveling agent; and 0.5-1.5 parts of dispersant. This invention, by setting a Zn-Ni-WC composite coating on the steel core and an anti-corrosion coating on the steel-cored aluminum strands, enables the prepared tensile-strength steel-cored aluminum stranded wire to possess superior corrosion resistance and ultra-long-term tensile strength retention.

Description

Technical Field

[0001] This invention relates to the field of steel-cored aluminum stranded wire technology, and specifically to a tensile steel-cored aluminum stranded wire. Background Technology

[0002] Aluminum Conductor Steel Reinforced (ACSR) is a widely used conductor material in power transmission. It consists of an inner layer of high-strength steel wire and an outer layer of multi-strand aluminum wire. The steel core, typically made of ordinary steel or galvanized steel wire, provides mechanical strength and tensile strength. The aluminum wire, wound around the steel core, is composed of multiple strands and is responsible for conducting current. ACSR is widely used in high-voltage transmission lines, urban power distribution networks, wind power generation, and solar power generation systems, characterized by its lightweight, high strength, and high conductivity. During use, ACSR is susceptible to corrosion from atmospheric moisture, chemical gases, dust, and salts. Corrosion decreases progressively from coastal industrial areas to rural areas. This corrosion can lead to wire breakage and strand breakage, causing power transmission accidents.

[0003] The mechanical life of steel-cored aluminum stranded wire fundamentally depends on the corrosion resistance of its galvanized steel core. Current technologies typically improve the corrosion resistance of the steel core by modifying the galvanizing process, applying anti-corrosion grease, or using an aluminum-clad steel core. However, these methods have limitations: excessively thick zinc layers increase brittleness, easily generating micro-cracks during stranding and bending, which can become entry points for corrosion; grease is prone to aging and drying, and may attract dust; while aluminum-clad steel cores offer good corrosion resistance, they are expensive, and the aluminum-steel interface can still corrode after mechanical damage. Some technologies employ applying anti-corrosion paint to the entire stranded wire after stranding, but the paint film is easily damaged during application and has difficulty penetrating the steel core, resulting in incomplete protection. Therefore, developing a steel-cored aluminum stranded wire with superior corrosion resistance and long-term tensile strength retention has become a pressing technical challenge in this field. Summary of the Invention

[0004] The purpose of this invention is to provide tensile-strength steel-cored aluminum stranded wire, and to solve the following technical problems:

[0005] Existing tensile steel-cored aluminum stranded wires suffer from insufficient corrosion resistance and low long-term tensile performance retention.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A tensile steel-cored aluminum stranded wire, comprising at least:

[0008] Steel core;

[0009] A Zn-Ni-WC composite coating is electroplated onto the steel core;

[0010] Aluminum stranded wire is stranded on a steel core coated with the Zn-Ni-WC composite coating;

[0011] An anti-corrosion coating is applied to the stranded aluminum wires;

[0012] The anti-corrosion coating comprises the following raw materials in parts by weight:

[0013] 60-70 parts of long-chain modified polyurethane acrylate prepolymer; 25-30 parts of isoborneol acrylate; 15-20 parts of dopamine-modified sustained-release microcapsules; 2-5 parts of photoinitiator; 0.5-1.5 parts of leveling agent; 0.5-1.5 parts of dispersant.

[0014] As a further aspect of the present invention, the thickness of the Zn-Ni-WC composite coating is 5-15 μm.

[0015] As a further aspect of the present invention: the plating solution of the Zn-Ni-WC composite coating includes at least the following raw materials:

[0016] Zinc chloride 80-100 g / L, nickel nitrate dihydrate 100-120 g / L, sodium citrate hexahydrate 150-200 g / L, ammonium chloride 180-220 g / L, nano tungsten carbide 10-40 g / L, hexadecyltrimethylammonium bromide 0.1-0.5 g / L, coumarin 0.5-1.5 g / L, sodium phenylpropanesulfonate 1-3 g / L.

[0017] As a further aspect of the present invention: the plating conditions for the Zn-Ni-WC composite coating are: pH value 5-6, temperature 40-50℃, and current density 2-4A / dm³. 2 .

[0018] As a further aspect of the present invention, the thickness of the anti-corrosion coating is 10-20 μm.

[0019] As a further aspect of the present invention, the preparation method of the long-chain modified polyurethane acrylate prepolymer includes the following steps:

[0020] δ-decyl lactone, terephthalic acid and diphenyl phosphate were mixed and reacted, and after washing, polydecyl lactone diol was obtained.

[0021] Isophorone diisocyanate, dibutyltin dilaurate, and ethyl acetate were mixed and heated in an oil bath. Triethylene glycol was added, and the temperature was increased further after the reaction. Polydecyl lactone diol was added, and the temperature was increased further after the reaction. P-hydroxyanisole and hydroxyethyl acrylate were added to react and obtain a long-chain modified polyurethane acrylate prepolymer.

[0022] As a further aspect of the present invention: the mass ratio of the δ-decyl lactone, the terephthalic acid dimethyl alcohol, and the diphenyl phosphate is 13-20:1-1.5:0.5-0.6; and the mass ratio of the isophorone diisocyanate, the dibutyltin dilaurate, the triethylene glycol, the polydecyl lactone diol, the p-hydroxyanisole, and the hydroxyethyl acrylate is 8-9:0.01-0.02:2.5-3.5:15-20:0.006-0.007:2-2.5.

[0023] As a further aspect of the present invention, the preparation method of the dopamine-modified sustained-release microcapsules includes the following steps:

[0024] Hollow glass microspheres were added to a sodium hydroxide solution, heated to react and freeze-dried, and then a mixed solution of benzotriazole, tung oil and ethyl acetate was added and vacuum impregnated to obtain corrosion inhibitor microcapsules.

[0025] Tris(hydroxymethyl)aminomethane was added to deionized water, followed by ultrasonic dispersion of the corrosion inhibitor microcapsules. Dopamine hydrochloride was then added. After the reaction was completed, the microcapsules were washed, filtered, and dried to obtain dopamine-modified sustained-release microcapsules.

[0026] As a further aspect of the present invention: the mass ratio of the benzotriazole, the tung oil and the hollow glass microspheres is 1-3:10:1.5-4.5, and the mass ratio of the corrosion inhibitor microcapsules and the dopamine hydrochloride is 8-12:1.

[0027] The beneficial effects of this invention are:

[0028] This invention forms a Zn-Ni-WC composite coating on the steel core through electroplating, creating an anti-corrosion coating on the stranded steel-core aluminum wire. This coating not only provides excellent corrosion and weather resistance but also maintains the original mechanical and electrical properties of the steel-core aluminum wire. The synergistic effect extends the corrosion resistance life of the steel core several times compared to traditional galvanized steel wire. The anti-corrosion coating utilizes a long-chain modified polyurethane acrylate prepolymer as the base resin and dopamine-modified slow-release microcapsules, which work synergistically to improve the coating's anti-corrosion performance. The dual corrosion of the steel core and aluminum wire is significantly suppressed at its source. Throughout the conductor's lifespan, the effective cross-sectional area of ​​its load-bearing components hardly decreases due to corrosion, ensuring the long-term stability of its rated breaking force. This makes it particularly suitable for important transmission lines and long-span projects, significantly extending its lifespan and reducing the overall cost over its entire lifespan, resulting in extremely high cost-effectiveness.

[0029] The Zn-Ni-WC composite coating prepared in this invention features the co-deposition of Zn and Ni and the uniform distribution of WC particles. The Zn-Ni alloy matrix provides excellent sacrificial anolyte protection; even with scratches on the coating, zinc preferentially corrodes and protects the internal steel substrate. The inclusion of nano-WC particles significantly refines the coating grains, eliminates porosity, and provides extremely high hardness and wear resistance. The uniformly distributed nano-WC particles effectively fill the pores in the alloy layer, providing a physical barrier and greatly extending the path of corrosive media to the substrate, thus significantly slowing down the corrosion process. Furthermore, WC is chemically extremely stable and does not participate in electrochemical reactions. The Zn-Ni-WC composite coating formed on the steel core surface in this invention has extremely high hardness, effectively resisting frictional wear against clamps, vibration dampers, and the interior of the aluminum strands during stranding, erection, and wind vibration, avoiding the problem of protective failure caused by wear in traditional zinc plating.

[0030] In this invention, an anti-corrosion coating is formed on stranded steel-cored aluminum wire. A long-chain modified polyurethane acrylate prepolymer with decanol is introduced as the base resin. Since aluminum wire requires frequent bending during production and installation, the long-chain polydecanol diol segments in the long-chain modified polyurethane acrylate prepolymer provide excellent flexibility and creep resistance. Furthermore, the polar groups in the polyurethane acrylate molecules can form strong intermolecular forces with the oxide layer on the aluminum surface, providing a solid foundation for adhesion and preventing the coating from cracking or peeling due to wire bending. Simultaneously, the hydrophobic long-chain structure and stable ester bonds give the anti-corrosion coating good hydrophobicity and water resistance, exhibiting excellent corrosion resistance. This invention also incorporates dopamine-modified sustained-release microcapsules into the coating. These microcapsules are hollow glass microspheres loaded with benzotriazole and tung oil. When the coating is damaged, the microcapsules rupture, and the tung oil immediately flows out, filling the cracks and undergoing oxidative cross-linking to form a physical barrier. The benzotriazole dissolved in the tung oil also flows out and diffuses through capillary action to the damaged aluminum surface, rapidly forming a highly efficient chemical protective film that inhibits electrochemical corrosion and improves repair efficiency. Simultaneously, the polydopamine shell not only enhances interfacial adhesion but also provides better protection for the internal repair agent mixture, preventing premature failure. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: The preparation method of long-chain modified polyurethane acrylate prepolymer includes the following steps:

[0033] 17 g of δ-decyl lactone, 1.38 g of terephthalic acid and 0.554 g of diphenyl phosphate were added to a 100 mL round-bottom flask and stirred at room temperature for 12 h. After the reaction was completed, the product was dissolved in acetone and washed three times with potassium hydroxide solution with a concentration of 1 mg / mL. The oil phase was collected, and ethyl acetate was added. The product was washed three times with water and the oil phase was collected. The ethyl acetate was removed by vacuum distillation to obtain polydecyl lactone diol.

[0034] In a 250 mL four-necked glass flask equipped with a mechanical stirrer, thermometer, condenser, and constant-pressure dropping funnel, add 8.88 g of isophorone diisocyanate, 0.018 g of dibutyltin dilaurate, and 20 g of ethyl acetate. Start stirring and slowly heat in an oil bath until the internal temperature of the flask reaches approximately 40 °C. Add 3 g of triethylene glycol dropwise, controlling the temperature of the reactants to not exceed 50 °C during the process. After the addition is complete, react at 50 °C for 2 hours. Subsequently, raise the temperature inside the flask to... At 60°C, 18.38 g of the polydecyl lactone diol prepared above was added dropwise, with the temperature inside the flask controlled to not exceed 70°C during the dropwise addition. After the dropwise addition was completed, the system temperature was controlled at 70°C for 2 hours. Finally, the temperature of the reactants was raised to 80°C, and 0.006 g of p-hydroxyanisole and 2.32 g of hydroxyethyl acrylate were added. The system temperature was controlled at 80°C for 3 hours. After the reaction was completed, ethyl acetate was removed by vacuum distillation to obtain the long-chain modified polyurethane acrylate prepolymer.

[0035] Example 2: The preparation method of dopamine-modified sustained-release microcapsules includes the following steps:

[0036] 1.5 g of hollow glass microspheres were added to 40 mL of 0.3 mol / L NaOH solution, mixed thoroughly, and heated to 160 °C for 2.5 h. After cooling to room temperature and freeze-drying, the microspheres were added to a mixed solution containing 1.5 g of benzotriazole, 10 g of tung oil and 5 g of ethyl acetate. The mixture was then placed in a vacuum drying oven for vacuum impregnation. The temperature was raised to 80 °C, and after the ethyl acetate had completely evaporated, the mixture was filtered to obtain corrosion inhibitor microcapsules.

[0037] 0.12 g of tris(hydroxymethyl)aminomethane was dissolved in 200 mL of deionized water and then placed in an ultrasonic bath. 2.4 g of the corrosion inhibitor microcapsules prepared above were added and ultrasonically dispersed. The mixture was then placed in a mechanical stirrer at 400 r / min and 0.24 g of dopamine hydrochloride was added. The mixture was reacted at room temperature in the dark for 18 h. After the reaction was completed, the mixture was washed with deionized water and ethyl acetate, filtered, and dried to obtain dopamine-modified sustained-release microcapsules.

[0038] Example 3: The preparation method of dopamine-modified sustained-release microcapsules includes the following steps:

[0039] 1.5 g of hollow glass microspheres were added to 40 mL of 0.3 mol / L NaOH solution, mixed thoroughly, and heated to 160 °C for 2.5 h. After cooling to room temperature and freeze-drying, the microspheres were added to a mixed solution containing 2.5 g of benzotriazole, 10 g of tung oil and 5 g of ethyl acetate. The mixture was then placed in a vacuum drying oven for vacuum impregnation. The temperature was raised to 80 °C, and after the ethyl acetate had completely evaporated, the mixture was filtered to obtain corrosion inhibitor microcapsules.

[0040] 0.12 g of tris(hydroxymethyl)aminomethane was dissolved in 200 mL of deionized water and then placed in an ultrasonic bath. 2.4 g of the corrosion inhibitor microcapsules prepared above were added and ultrasonically dispersed. The mixture was then placed in a mechanical stirrer at 400 r / min and 0.24 g of dopamine hydrochloride was added. The mixture was reacted at room temperature in the dark for 18 h. After the reaction was completed, the mixture was washed with deionized water and ethyl acetate, filtered, and dried to obtain dopamine-modified sustained-release microcapsules.

[0041] Example 4 A tensile steel-cored aluminum stranded wire, manufactured by the following method:

[0042] A Zn-Ni-WC plating solution was prepared by mixing 90 g / L zinc chloride, 110 g / L nickel nitrate dihydrate, 180 g / L sodium citrate hexahydrate, 200 g / L ammonium chloride, 25 g / L nano tungsten carbide, 0.3 g / L hexadecyltrimethylammonium bromide, 1.0 g / L coumarin, and 2 g / L sodium phenylpropanesulfonate.

[0043] High-carbon steel wire was added to a degreasing alkaline solution and kept at 70°C for 10 minutes, then immersed in 10wt% dilute sulfuric acid for 3 seconds. After being removed and rinsed with deionized water, it was placed in the Zn-Ni-WC plating solution described above, and plated at pH 5.5, 45°C, and 3A / dm³. 2 Electroplating at current density for 15 minutes yields a steel core coated with a Zn-Ni-WC composite plating.

[0044] 65 parts by weight of the long-chain modified polyurethane acrylate prepolymer prepared in Example 1, 28 parts by weight of acrylate isobornyl ester, 18 parts by weight of the dopamine modified sustained-release microcapsules prepared in Example 2, 3 parts by weight of photoinitiator 184, 1 part by weight of leveling agent BYK-361, and 1 part by weight of dispersant BYK-110 were mixed and stirred in the dark to obtain an anti-corrosion coating.

[0045] Aluminum wire is stranded with the aforementioned steel core on a stranding machine, with 12 strands in the inner layer and 14 strands in the outer layer, forming a steel-cored aluminum stranded wire. This wire is then immersed in a degreasing alkaline solution at 70°C for 10 minutes, rinsed with deionized water, and coated with the aforementioned anti-corrosion coating. The wire is then preheated at 80°C for 2 minutes to evaporate the solvent, and finally treated with 1000 mJ / cm² water. 2 UV curing forms a coating approximately 15μm thick, resulting in tensile steel-core aluminum stranded wire.

[0046] Compared with Example 4, Example 5 only replaces the dopamine-modified sustained-release microcapsules prepared in Example 2 with the dopamine-modified sustained-release microcapsules prepared in Example 3 in the preparation of the anti-corrosion coating. The other components and preparation methods are completely the same as those in Example 4.

[0047] Example 6 A tensile steel-cored aluminum stranded wire, manufactured by the following method:

[0048] A Zn-Ni-WC plating solution was prepared by mixing 100 g / L zinc chloride, 110 g / L nickel nitrate dihydrate, 180 g / L sodium citrate hexahydrate, 200 g / L ammonium chloride, 40 g / L nano tungsten carbide, 0.3 g / L hexadecyltrimethylammonium bromide, 1.0 g / L coumarin, and 2 g / L sodium phenylpropanesulfonate.

[0049] High-carbon steel wire was added to a degreasing alkaline solution and kept at 70°C for 10 minutes, then immersed in 10wt% dilute sulfuric acid for 3 seconds. After being removed and rinsed with deionized water, it was placed in the Zn-Ni-WC plating solution described above, and plated at pH 5.5, 45°C, and 3A / dm³. 2 Electroplating at current density for 15 minutes yields a steel core coated with a Zn-Ni-WC composite plating.

[0050] 70 parts by weight of the long-chain modified polyurethane acrylate prepolymer prepared in Example 1, 25 parts by weight of acrylate isobornyl ester, 20 parts by weight of the dopamine modified sustained-release microcapsules prepared in Example 2, 3 parts by weight of photoinitiator 184, 1 part by weight of leveling agent BYK-361, and 1 part by weight of dispersant BYK-110 were mixed and stirred in the dark to obtain an anti-corrosion coating.

[0051] Aluminum wire is stranded with the aforementioned steel core on a stranding machine, with 12 strands in the inner layer and 14 strands in the outer layer, forming a steel-cored aluminum stranded wire. This wire is then immersed in a degreasing alkaline solution at 70°C for 10 minutes, rinsed with deionized water, and coated with the aforementioned anti-corrosion coating. The wire is then preheated at 80°C for 2 minutes to evaporate the solvent, and finally treated with 1000 mJ / cm² water. 2 UV curing forms a coating approximately 15μm thick, resulting in tensile steel-core aluminum stranded wire.

[0052] Compared with Example 6, Example 7 only replaces the dopamine-modified sustained-release microcapsules prepared in Example 2 with the dopamine-modified sustained-release microcapsules prepared in Example 3 in the preparation of the anti-corrosion coating. The other components and preparation methods are completely the same as those in Example 6.

[0053] Comparative Example 1: The preparation method of polyurethane acrylate includes the following steps:

[0054] 6.84 g of caprolactone, 1.38 g of terephthalic acid and 0.554 g of diphenyl phosphate were added to a 100 mL round-bottom flask and stirred at room temperature for 12 h. After the reaction was completed, the product was dissolved in acetone and washed three times with potassium hydroxide solution with a concentration of 1 mg / mL. The oil phase was collected, and ethyl acetate was added. The product was washed three times with water and the oil phase was collected. The ethyl acetate was removed by vacuum distillation to obtain polycaprolactone diol.

[0055] In a 250 mL four-necked glass flask equipped with a mechanical stirrer, thermometer, condenser, and constant-pressure dropping funnel, 8.88 g of isophorone diisocyanate, 0.018 g of dibutyltin dilaurate, and 20 g of ethyl acetate were added. The stirring was started, and the mixture was slowly heated in an oil bath until the internal temperature of the flask reached approximately 40 °C. 3 g of triethylene glycol was then added dropwise, with the temperature of the reactants controlled to not exceed 50 °C during the process. After the addition was complete, the mixture was reacted at 50 °C for 2 hours. Subsequently, the temperature of the flask was raised to 60 °C, and 8.22 g of the polycaprolactone diol prepared above was added dropwise, with the internal temperature controlled to not exceed 70 °C during the dropwise process. After the addition was complete, the system temperature was controlled at 70 °C for 2 hours. Finally, the temperature of the reactants was raised to 80 °C, and 0.006 g of p-hydroxyanisole and 2.32 g of hydroxyethyl acrylate were added. The system temperature was controlled at 80 °C for 3 hours. After the reaction was completed, ethyl acetate was removed by vacuum distillation to obtain a polyurethane acrylate prepolymer.

[0056] Compared with Example 2, Comparative Example 2 only replaced the benzotriazole and other ingredients added in Example 2 with tung oil. The remaining components and preparation methods were completely the same as in Example 2.

[0057] Compared with Example 4, Comparative Example 3 only replaced the long carbon chain modified polyurethane acrylate prepolymer prepared in Example 1 with the polyurethane acrylate prepolymer prepared in Comparative Example 1 in the preparation of the anti-corrosion coating. The other components and preparation methods were completely the same as those in Example 4.

[0058] Compared with Example 4, Comparative Example 4 only replaced the dopamine-modified sustained-release microcapsules prepared in Example 2 with the dopamine-modified sustained-release microcapsules prepared in Comparative Example 2 in the preparation of the anti-corrosion coating. The other components and preparation methods were completely the same as those in Example 4.

[0059] Compared with Example 4, Comparative Example 5 only differs from Example 4 in that the dopamine-modified sustained-release microcapsules prepared in Example 2 are not added during the preparation of the anti-corrosion coating. The remaining components and preparation methods are completely consistent with those of Example 4.

[0060] Compared with Example 4, Comparative Example 6 is the only difference that no Zn-Ni-WC composite coating is formed on the steel core during the preparation of tensile steel core aluminum stranded wire. The other components and preparation methods are completely the same as those in Example 4.

[0061] Performance testing

[0062] Wear resistance test of Zn-Ni-WC composite coating: The Zn-Ni-WC composite coating was tested using an HSR-2M reciprocating friction tester. The sliding distance was 5mm, the reciprocating frequency was 5Hz, the load was 5N, and the test time was 60min. The grinding ball was a 304 stainless steel ball with a diameter of 6mm. The friction coefficient was calculated as COF=F / N.

[0063] Wherein, COF is the coefficient of friction, F is the frictional force recorded by the sensor, and N is the load; the detection results are shown in Table 1;

[0064] Wetting test of anti-corrosion coating: The surface contact angle of the anti-corrosion coating was measured using an optical contact angle meter (DSA100). The water droplet size was 8μL. To reduce errors and obtain accurate experimental test results, the test was conducted 5 times at different locations, and the average value was taken as the final test result. The test results are shown in Table 1.

[0065] Adhesion test of anti-corrosion coating: A Positest ATA-20 pull-out type fully automatic adhesion tester was used for measurement. First, the sample surface and test spindle were preliminarily ground to improve adhesion. Then, a special adhesive was used to firmly bond the anti-corrosion coating sample to the test spindle. After the adhesive had completely cured, the adhesion was measured according to the standard test procedure. To ensure data reliability, three parallel samples were set up for each experiment, and each sample was tested three times. Finally, the average of all test results was taken as the adhesion value of the coating; the test results are shown in Table 1.

[0066] Electrochemical Impedance Spectroscopy (EIS) Testing of Anti-corrosion Coatings: The anti-corrosion coatings were tested using a KOSTER CS350M electrochemical workstation. A scratched coating was used for electrochemical analysis; the scratching was performed by creating a cross-shaped scratch on the coating surface with a utility knife. A three-electrode system was used for the electrochemical tests: a coated tensile steel-core aluminum stranded wire as the working electrode (WE), a saturated calomel electrode (RE) as the reference electrode, and a platinum electrode as the counter electrode (CE). The amplitude was ±20 mV, and the scanning frequency range was 105 Hz to 102 Hz. Both the coated and scratched coatings were immersed in a 3.5 wt.% NaCl solution, and the changes in impedance modulus values ​​were measured after 30 days of immersion, followed by fitting analysis. The results are shown in Table 1.

[0067] Neutral salt spray resistance test of anti-corrosion coating: The macroscopic anti-corrosion ability of the anti-corrosion coating was tested by immersion in salt water. A cross-shaped scratch was made on the coating surface with a utility knife, and the scratch depth should penetrate the coating to the tensile steel core aluminum stranded wire substrate. The scratched coating was immersed in a 3.5 wt.% NaCl solution at room temperature for 30 days, and the macroscopic corrosion morphology of the scratched area of ​​the coating after immersion in salt water was observed. The test results are shown in Table 1.

[0068] Table 1: Statistical Table of Performance Test Data for Steel-Cored Aluminum Stranded Wires in Examples 4-7 and Comparative Examples 3-6

[0069]

[0070] As shown in Table 1, the tensile steel-core aluminum stranded wire prepared by this invention has a hydrophobic corrosion-resistant coating and a wear-resistant and corrosion-resistant Zn-Ni-WC composite coating on the steel core, which gives the prepared tensile steel-core aluminum stranded wire long-term corrosion resistance, thereby ensuring long-term tensile strength. The anti-corrosion coating prepared in Comparative Example 3 was not modified with long carbon chains, resulting in a hydrophilic surface and the worst adhesion, leading to decreased corrosion resistance. In Comparative Example 4, the anti-corrosion coating with added dopamine-modified slow-release microcapsules but without benzotriazole showed decreased corrosion resistance, indicating a synergistic anti-corrosion effect between benzotriazole and tung oil. In Comparative Example 5, the anti-corrosion coating without added dopamine-modified slow-release microcapsules showed significantly reduced corrosion resistance and adhesion. In Comparative Example 6, no Zn-Ni-WC composite coating was formed on the steel core, and scratch tests corroded the steel core, indicating that the corrosion resistance of a single anti-corrosion coating is limited.

[0071] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A tensile-strength steel-cored aluminum stranded wire, characterized in that, At least including: Steel core; A Zn-Ni-WC composite coating is electroplated onto the steel core; Aluminum stranded wire is stranded on a steel core coated with the Zn-Ni-WC composite coating; An anti-corrosion coating is applied to the stranded aluminum wires; The anti-corrosion coating comprises the following raw materials in parts by weight: 60-70 parts of long-chain modified polyurethane acrylate prepolymer; 25-30 parts of isobornyl acrylate; 15-20 parts of dopamine-modified sustained-release microcapsules; 2-5 parts of photoinitiator; 0.5-1.5 parts of leveling agent; 0.5-1.5 parts of dispersant; The preparation method of the long-chain modified polyurethane acrylate prepolymer includes the following steps: δ-decyl lactone, terephthalic acid and diphenyl phosphate were mixed and reacted, and after washing, polydecyl lactone diol was obtained. Isophorone diisocyanate, dibutyltin dilaurate and ethyl acetate were mixed and heated in an oil bath. Triethylene glycol was added and the temperature was increased after the reaction. Polydecyl lactone diol was added and the temperature was increased after the reaction. p-hydroxyanisole and hydroxyethyl acrylate were added and reacted to obtain a long-chain modified polyurethane acrylate prepolymer. The preparation method of the dopamine-modified sustained-release microcapsules includes the following steps: Hollow glass microspheres were added to a sodium hydroxide solution, heated to react and freeze-dried, and then a mixed solution of benzotriazole, tung oil and ethyl acetate was added and vacuum impregnated to obtain corrosion inhibitor microcapsules. Tris(hydroxymethyl)aminomethane was added to deionized water, followed by ultrasonic dispersion of the corrosion inhibitor microcapsules. Dopamine hydrochloride was then added. After the reaction was completed, the microcapsules were washed, filtered, and dried to obtain dopamine-modified sustained-release microcapsules.

2. The tensile steel-cored aluminum stranded wire according to claim 1, characterized in that, The thickness of the Zn-Ni-WC composite coating is 5-15 μm.

3. The tensile steel-cored aluminum stranded wire according to claim 1, characterized in that, The plating solution for the Zn-Ni-WC composite coating includes at least the following raw materials: Zinc chloride 80-100 g / L, nickel nitrate dihydrate 100-120 g / L, sodium citrate hexahydrate 150-200 g / L, ammonium chloride 180-220 g / L, nano tungsten carbide 10-40 g / L, hexadecyltrimethylammonium bromide 0.1-0.5 g / L, coumarin 0.5-1.5 g / L, sodium phenylpropanesulfonate 1-3 g / L.

4. The tensile steel-cored aluminum stranded wire according to claim 3, characterized in that, The plating conditions for the Zn-Ni-WC composite coating are: pH value 5-6, temperature 40-50℃, and current density 2-4A / dm³. 2 .

5. The tensile steel-cored aluminum stranded wire according to claim 1, characterized in that, The thickness of the anti-corrosion coating is 10-20 μm.

6. The tensile steel-cored aluminum stranded wire according to claim 1, characterized in that, The mass ratio of δ-decyl lactone, terephthalic acid, and diphenyl phosphate is 13-20:1-1.5:0.5-0.6, and the mass ratio of isophorone diisocyanate, dibutyltin dilaurate, triethylene glycol, polydecyl lactone diol, p-hydroxyanisole, and hydroxyethyl acrylate is 8-9:0.01-0.02:2.5-3.5:15-20:0.006-0.007:2-2.

5.

7. The tensile steel-cored aluminum stranded wire according to claim 1, characterized in that, The mass ratio of the benzotriazole, the tung oil, and the hollow glass microspheres is 1-3:10:1.5-4.5, and the mass ratio of the corrosion inhibitor microcapsules and the dopamine hydrochloride is 8-12:1.

Images