Corrosion-resistant steel strand and preparation method thereof

Abstract

The invention relates to the technical field of steel strands, and particularly discloses a corrosion-resistant steel strand and a preparation method thereof. The corrosion-resistant steel strand is formed by twisting a plurality of corrosion-resistant steel wires, each corrosion-resistant steel wire comprises a steel wire, a corrosion-resistant coating is arranged on the peripheral surface of each steel wire, and each corrosion-resistant coating is formed by curing a corrosion-resistant coating; the corrosion-resistant coating is mainly prepared from the following raw materials: a water-based hydroxyl acrylic acid dispersion, a blocked isocyanate curing agent, 2-hydroxy-2-methyl-3-oxobutyric acid ethyl ester, modified silicon dioxide, a silane coupling agent, a wetting agent, a flatting agent, a defoaming agent, a thickening agent and deionized water. The corrosion-resistant coating has the characteristics of high adhesive force, high wear resistance and high corrosion resistance, the corrosion-resistant steel strand obtained by applying the corrosion-resistant coating to steel wires and twisting the steel wires has higher corrosion resistance, the service life is prolonged, and market requirements are met.

Description

Technical Field

[0001] This application relates to the field of steel strand technology, and more specifically, to a corrosion-resistant steel strand and a method for preparing the same. Background Technology

[0002] Steel strand, composed of multiple strands of steel wire twisted together, is widely used in numerous industries such as construction, coal mining, bridge building, and power generation. Traditional steel strand is susceptible to corrosion in harsh environments, severely impacting its performance and service life. To improve the corrosion resistance of steel strand, some researchers spray corrosion-resistant coatings onto the surface of the steel wires. These coatings cure to form a corrosion-resistant layer, which blocks corrosive media from contacting the steel wire, thus extending its service life. Existing corrosion-resistant coatings generally contain raw materials including water-based acrylates, curing agents, fillers, wetting agents, leveling agents, defoamers, thickeners, and deionized water. Corrosion-resistant steel wire obtained using this formulation exhibits some corrosion resistance; however, its resistance to immersion in 5% sodium chloride for <1200 hours, 5% sodium hydroxide for <1100 hours, and 5% hydrochloric acid for <900 hours is insufficient and requires further improvement. Summary of the Invention

[0003] In order to improve the corrosion resistance of corrosion-resistant steel wire, and thus improve the corrosion resistance of corrosion-resistant steel strand and extend its service life, this application provides a corrosion-resistant steel strand and its preparation method.

[0004] In a first aspect, this application provides a corrosion-resistant steel strand, employing the following technical solution: A corrosion-resistant steel strand is formed by stranding multiple corrosion-resistant steel wires, wherein the corrosion-resistant steel wires include steel wires and a corrosion-resistant coating is provided on the outer circumferential surface of the steel wires. The corrosion-resistant coating is formed by curing a corrosion-resistant paint. The corrosion-resistant coating is mainly made of the following raw materials in weight percentages: 45-55% water-based hydroxy acrylic dispersion, 3-5% blocked isocyanate curing agent, 5-10% ethyl 2-hydroxy-2-methyl-3-oxobutyrate, 4-6% modified silica, 0.3-1% silane coupling agent, 0.3-1% wetting agent, 0.3-1% leveling agent, 0.1-0.5% defoamer, 0.1-0.5% thickener, and the balance being deionized water; the modified silica is obtained by treating silica with 3-allyloxypropyltrimethoxysilane, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, and 10-undecenoyl hydrazine.

[0005] The corrosion-resistant steel strand of this application is made of multiple corrosion-resistant steel wires twisted together, effectively increasing structural strength. Furthermore, the corrosion-resistant steel wires are coated with a corrosion-resistant coating. This coating is formed on the outer surface of the steel wire using a corrosion-resistant paint. Through the interaction of the raw materials in the corrosion-resistant paint, the interfacial bonding force between the coating and the steel wire is effectively increased, achieving an adhesion grade of 1. The coating's abrasion resistance is also increased, with a mass loss of <6mg / 1000 revolutions. Furthermore, its corrosion resistance is improved, withstanding immersion in 5% sodium chloride for >1400h, 5% sodium hydroxide for >1200h, and 5% hydrochloric acid for >1100h. This results in higher corrosion resistance, extended service life, and meets market demands.

[0006] The corrosion-resistant coating of this application is based on an aqueous hydroxy acrylic dispersion, with the addition of a blocked isocyanate curing agent. At room temperature, the isocyanate groups in the blocked isocyanate curing agent are in a blocked state, meaning the isocyanate groups are temporarily inactive. By heating the blocked isocyanate curing agent, the blocked isocyanate groups are unblocked, thus restoring their activity and achieving crosslinking with the aqueous hydroxy acrylic dispersion. Furthermore, ethyl 2-hydroxy-2-methyl-3-oxobutyrate is added, containing ester, hydroxyl, and ketone carbonyl groups. The hydroxyl groups in ethyl 2-hydroxy-2-methyl-3-oxobutyrate react with the unblocked isocyanate groups, increasing the crosslinking density and improving corrosion resistance, abrasion resistance, and interfacial adhesion. Modified silica is also added by grafting 3-allyloxypropyltrimethoxysilane, carbon-carbon double bonds in N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, and 10-undecenoyl hydrazine onto the silica surface. This results in a large number of active groups such as quaternary ammonium cations, sulfate anions, ester groups, and hydrazide groups on the modified silica surface. This not only improves the dispersibility of the modified silica, making it more uniform, but also allows the hydrazide groups on the modified silica surface to react with the ketone carbonyl groups in ethyl 2-hydroxy-2-methyl-3-oxobutyrate, further increasing the crosslinking density and interfacial bonding ability. This improves the overall integrity and density of the corrosion-resistant coating, enhances wear resistance and corrosion resistance, and effectively improves adhesion. This enhances the performance of the corrosion-resistant coating, thereby improving the corrosion resistance of the corrosion-resistant steel strand and extending its service stability and lifespan.

[0007] Optionally, the modified silica is prepared using the following method: S1. Mix water and silica, add 3-allyloxypropyltrimethoxysilane, stir for 1-3 hours, filter, and obtain pretreated silica. S2. Mix water and emulsifier, add pretreated silica and mix, add N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt and 10-undecenoyl hydrazine and mix, add initiator, stir and treat for 1-3 hours, filter, wash and dry to obtain modified silica.

[0008] Optionally, the weight ratio of the silica, 3-allyloxypropyltrimethoxysilane, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, and 10-undecenoyl hydrazine is 100:(9-11):(7-9):(4-6).

[0009] By employing the above technical solution, 3-allyloxypropyltrimethoxysilane is first grafted onto the surface of silica, introducing carbon-carbon double bonds. Then, under the action of an initiator, the carbon-carbon double bonds on the silica surface, along with the carbon-carbon double bonds in the inner salt of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid and the carbon-carbon double bonds in 10-undecenoyl hydrazine, undergo a polymerization reaction, thereby achieving grafting and introducing quaternary ammonium cations, sulfate anions, ester groups, and hydrazide groups. This step-by-step grafting process on the silica surface facilitates the preparation of modified silica.

[0010] Optionally, the weight ratio of silicon dioxide to initiator is 100:(2-3).

[0011] By adopting the above technical solution, the amount of initiator added is optimized, which reduces the impact on grafting effect due to insufficient initiator addition and also reduces the increase in cost due to excessive initiator addition.

[0012] Optionally, the initiator is one or more of ammonium persulfate, sodium persulfate, potassium persulfate, and hydrogen peroxide.

[0013] By adopting the above technical solutions, ammonium persulfate, sodium persulfate, potassium persulfate, and hydrogen peroxide can all be used as initiators to accelerate the polymerization reaction in the reaction system, realize the grafting of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt and 10-undecenoyl hydrazine, and ensure the stability of the modified silica preparation.

[0014] Optionally, in step S1, the weight ratio of silicon dioxide to water is 100:(800-1200).

[0015] By adopting the above technical solution, the amount of water added in step S1 is optimized to ensure sufficient contact and reaction between silica and 3-allyloxypropyltrimethoxysilane, thus guaranteeing the stability of the pretreated silica preparation. In several embodiments, the weight ratio of silica to water in step S1 is 100:1000. This ratio can also be set to 100:800, 100:900, 100:1100, 100:1200, etc., as needed, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0016] Optionally, in step S2, the weight ratio of silica, water, and emulsifier is 100:(800-1200):(3-7).

[0017] By adopting the above technical solution, the amount of water and emulsifier added in step S2 is optimized to ensure sufficient contact and reaction between the pretreated silica, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, 10-undecenoyl hydrazine, and initiator, thus guaranteeing the stability and effectiveness of the modified silica preparation. In several embodiments, the weight ratio of silica, water, and emulsifier in step S2 is 100:1000:5. This ratio can also be set to 100:800:3, 100:800:7, 100:1200:3, 100:1200:7, etc., as needed, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0018] Optionally, the emulsifier is one or more of Tween 80, Tween 60, Span 80, and Span 60.

[0019] By adopting the above technical solution, the emulsifier is optimized, which facilitates the selection of emulsifier.

[0020] Optionally, the average particle size of the silica is 10-100 nm. Preferably, the average particle size of the silica is 10-80 nm.

[0021] By adopting the above technical solution, the particle size of silica is optimized to ensure that the modified silica has a nanometer-scale particle size, thereby improving the interfacial bonding force between the modified silica and the corrosion-resistant coating and enhancing the corrosion resistance of the coating. In several embodiments, the average particle size of silica is 50 nm, but it can also be set to 10 nm, 20 nm, 30 nm, 40 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, etc., as needed, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0022] Optionally, the blocked isocyanate curing agent is one or more of JX-616 curing agent, ZS-2601 curing agent, HD-8035 curing agent, and WD-8670 curing agent.

[0023] By adopting the above technical solution, the blocked isocyanate curing agent is optimized, which not only facilitates the selection of blocked isocyanate curing agents, but also allows the blocked isocyanate groups in JX-616 curing agent, ZS-2601 curing agent, HD-8035 curing agent, and WD-8670 curing agent to be deblocked at high temperature, thereby achieving cross-linking, increasing the cross-linking density of the corrosion-resistant coating, and improving the corrosion resistance of the corrosion-resistant steel strand.

[0024] Optionally, the silane coupling agent is one or more of 3-allyloxypropyltrimethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, vinyltriethoxysilane, and 3-aminopropyltriethoxysilane. The wetting agent is one or more of TEGO Wet 260 wetting agent, BYK-348 wetting agent, HY-4000 wetting agent, and GPWR-301 wetting agent; The leveling agent is one or more of TEGO Flow 300 leveling agent, LAG-925 leveling agent, EFKA-3777 leveling agent, and BYK-330 leveling agent; The defoamer is one or more of FoamStar SI 2280 defoamer, YRXP-08W defoamer, BD-303 defoamer, and BYK-018 defoamer; The thickener is one or more of Thixol 53L thickener, COAPUR 830W thickener, TT-935 thickener, and TEGOViscoPlus 3030 thickener.

[0025] By adopting the above technical solutions, the silane coupling agent, wetting agent, leveling agent, defoamer, and thickener are optimized, which facilitates the selection of silane coupling agents, wetting agents, leveling agents, defoamers, and thickeners, and ensures the quality and performance of the corrosion-resistant coating.

[0026] Optionally, the corrosion-resistant coating is prepared by the following method: mixing an aqueous hydroxy acrylic dispersion, a blocked isocyanate curing agent, ethyl 2-hydroxy-2-methyl-3-oxobutyrate, modified silica, a silane coupling agent, a wetting agent, a leveling agent, a defoamer, a thickener, and deionized water to obtain the corrosion-resistant coating.

[0027] By adopting the above technical solution, it is convenient to prepare corrosion-resistant coatings.

[0028] Optionally, the diameter of the steel wire is 4-15 mm.

[0029] By adopting the above technical solution, the diameter of the steel wire is optimized, and corrosion-resistant steel strands of different diameters are prepared to meet different application requirements. In several embodiments, the diameter of the steel wire is 7.2mm, but it can also be set to 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 15mm, etc., as needed, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0030] Optionally, the number of corrosion-resistant steel wires used in the corrosion-resistant steel strand is one of 2, 3, 7, or 19.

[0031] By adopting the above technical solution, the number of corrosion-resistant steel wires used in corrosion-resistant steel strands can be optimized, enabling the production of corrosion-resistant steel strands with various diameters to meet different application requirements. In several implementation schemes, the number of corrosion-resistant steel wires used in the corrosion-resistant steel strands is 7, but it can also be set to 2, 3, or 19 wires as needed.

[0032] Optionally, the thickness of the corrosion-resistant coating is 5-20 μm.

[0033] By adopting the above technical solution, the thickness of the corrosion-resistant coating is optimized, reducing the impact on corrosion resistance caused by an insufficiently thin coating and reducing the increased cost caused by an excessively thick coating. In several embodiments, the thickness of the corrosion-resistant coating is 10 μm, but it can also be set to 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, etc., as needed, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0034] Secondly, this application provides a method for preparing the corrosion-resistant steel strand, which adopts the following technical solution: A method for preparing the corrosion-resistant steel strand includes the following steps: T1. Pickle, wash with water and dry the steel wire to obtain pretreated steel wire; T2. Spray the corrosion-resistant coating onto the surface of the pretreated steel wire, and cure it. The corrosion-resistant coating is cured to form a corrosion-resistant coating, thus obtaining corrosion-resistant steel wire. T3. Take multiple corrosion-resistant steel wires and twist them into strands to obtain corrosion-resistant steel strands.

[0035] By adopting the above technical solution, not only is it convenient to prepare corrosion-resistant steel strands, but the steel wires are also pretreated. With the combination of pickling, washing and drying, impurities and oxide layers on the surface of the steel wires can be effectively removed, the interfacial bonding force between the corrosion-resistant coating and the steel wires can be enhanced, and the service life of the corrosion-resistant steel strands can be extended.

[0036] Optionally, in the curing process of step T2, the curing temperature is 170-190℃ and the time is 10-30 min.

[0037] By adopting the above technical solution, the temperature and time in the curing process are optimized, facilitating the curing of the corrosion-resistant coating to form a corrosion-resistant layer. In several implementation schemes, the curing temperature is 180℃ and the time is 20 minutes. However, the temperature can also be set to 170℃, 175℃, 185℃, 190℃, etc., and the time can be set to 10 minutes, 15 minutes, 25 minutes, 30 minutes, etc., as needed. However, it is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0038] In summary, this application has at least the following beneficial effects: 1. The corrosion-resistant steel strand of this application is made of multiple corrosion-resistant steel wires twisted together. By improving the performance of the corrosion-resistant steel wires, the corrosion resistance of the steel strand is improved. The corrosion-resistant steel wire of this application has a corrosion-resistant coating on its surface, which is formed by curing a corrosion-resistant coating material. The corrosion-resistant coating of this application, through the synergistic effect of the raw materials, has the characteristics of high adhesion, high wear resistance, and high corrosion resistance. Its adhesion grade is 1, mass loss is <6mg / 1000 rpm, resistance to immersion in 5% sodium chloride for >1400h, resistance to immersion in 5% sodium hydroxide for >1200h, and resistance to immersion in 5% hydrochloric acid for >1100h. Applying the corrosion-resistant coating to the steel wire to obtain corrosion-resistant steel wire results in higher corrosion resistance, thereby improving the corrosion resistance of the corrosion-resistant steel strand, extending its service life, and meeting market demands.

[0039] 2. The corrosion-resistant coating of this application contains ethyl 2-hydroxy-2-methyl-3-oxobutyrate and modified silica in its raw materials. Ethyl 2-hydroxy-2-methyl-3-oxobutyrate contains ester groups, hydroxyl groups, and ketone carbonyl groups. The modified silica surface contains a large number of quaternary ammonium cations, sulfate anions, ester groups, hydrazide groups, and other groups. These not only form coordination bonds with the steel wire surface, increasing the interfacial bonding force, but also increase the crosslinking density, improve the integrity and density of the corrosion-resistant coating, and enhance adhesion, wear resistance, and corrosion resistance, thus making the corrosion-resistant coating exhibit superior comprehensive performance. Detailed Implementation

[0040] To make this application easier to understand, the following detailed description will be provided with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained commercially or by conventional methods.

[0041] Preparation Example Preparation Example 1 A modified silica, prepared by the following method: S1. Add 100g of silica to 1000g of water and stir for 5 minutes. Then add 10g of 3-allyloxypropyltrimethoxysilane and stir for 2 hours. After filtration, obtain pretreated silica.

[0042] The silica is CY-SP50 silica with an average particle size of 50nm, and it is sourced from Hangzhou Jiupeng New Materials Co., Ltd.

[0043] S2. Add 5g of emulsifier to 1000g of water and stir for 1 min. Then add the pretreated silica obtained in step S1 and stir for 5 min. Next, add 8g of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt and 5g of 10-undecenoic acid hydrazine and stir for 10 min. Then add 2.5g of initiator and stir for 2 h. After filtration, wash once with 500g of ethanol and twice with 500g of water, and dry to obtain modified silica.

[0044] The emulsifier is Tween 80; the initiator is ammonium persulfate.

[0045] Preparation Example 2 A modified silica differs from Preparation Example 1 in that the amount of 3-allyloxypropyltrimethoxysilane added in step S1 is different, and the amounts of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, 10-undecenoyl hydrazine, and initiator added in step S2 are different.

[0046] Furthermore, in step S1, the amount of 3-allyloxypropyltrimethoxysilane added is 9g, and in step S2, the amount of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt added is 7g, the amount of 10-undecenoyl hydrazine added is 6g, and the amount of initiator added is 3g.

[0047] Preparation Example 3 A modified silica differs from Preparation Example 1 in that the amount of 3-allyloxypropyltrimethoxysilane added in step S1 is different, and the amounts of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, 10-undecenoyl hydrazine, and initiator added in step S2 are different.

[0048] Furthermore, in step S1, the amount of 3-allyloxypropyltrimethoxysilane added is 11g, and in step S2, the amount of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt added is 9g, the amount of 10-undecenoyl hydrazine added is 4g, and the amount of initiator added is 2g. Example

[0049] Table 1. Content of each raw material in corrosion-resistant coatings (unit: wt%) Example Example 1 Example 2 Example 3 Aqueous hydroxy acrylic acid dispersion 50 45 55 Blocked isocyanate curing agent 4 3 5 Ethyl 2-hydroxy-2-methyl-3-oxobutyrate 8 10 5 Modified silica 5 6 4 Silane coupling agents 0.5 0.3 1 wetting agent 0.5 1 0.3 Leveling agent 0.5 0.3 1 Defoamer 0.2 0.5 0.1 Thickener 0.2 0.5 0.1 Deionized water 26.1 27.4 24.5 total 100 100 100 Example 1 A corrosion-resistant steel strand is provided, which is composed of 7 corrosion-resistant steel wires twisted together. The corrosion-resistant steel wire includes a steel wire with a diameter of 7.2 mm, and a corrosion-resistant coating with a thickness of 10 μm is provided on the outer circumference of the steel wire. The corrosion-resistant coating is formed by curing a corrosion-resistant coating material.

[0050] The steel wire is composed of the following elements by weight percentage: C: 0.85%, Mn: 0.52%, Cr: 0.37%, Si: 0.31%, Ni: 0.16%, V: 0.11%, Ti: 0.07%, La: 0.07%, Zr: 0.06%, P: 0.01%, S: 0.008%, with the balance being Fe.

[0051] The raw materials and their proportions for corrosion-resistant coatings are shown in Table 1.

[0052] Among them, the aqueous hydroxy acrylic dispersion is B242A aqueous hydroxy acrylic dispersion, and is selected from Shenzhen Winova Chemical Materials Co., Ltd.; the blocked isocyanate curing agent is JX-616 curing agent; the silane coupling agent is 3-allyloxypropyltrimethoxysilane; the wetting agent is TEGO Wet 260 wetting agent; the leveling agent is TEGO Flow 300 leveling agent; the defoamer is FoamStar SI 2280 defoamer; the thickener is Thixol 53L thickener; and the modified silica is prepared by the method of Preparation Example 1.

[0053] Furthermore, the corrosion-resistant coating is prepared using the following method: Aqueous hydroxy acrylic dispersion was added to deionized water and stirred for 10 min. Then, ethyl 2-hydroxy-2-methyl-3-oxobutyrate, silane coupling agent, wetting agent, leveling agent, defoamer, and thickener were added and stirred for 10 min. Modified silica was then added and stirred for 30 min. Finally, a blocked isocyanate curing agent was added and stirred for 10 min to obtain a corrosion-resistant coating.

[0054] A method for preparing corrosion-resistant steel strand includes the following steps: T1. Pickle, wash with water, and dry the steel wire to obtain pretreated steel wire.

[0055] The pickling process is as follows: the steel wire is placed in a 5% hydrochloric acid aqueous solution and soaked for 5 minutes. Then it is removed to complete the pickling process.

[0056] Furthermore, the weight ratio of steel wire to hydrochloric acid solution is 1:5.

[0057] T2. Spray the corrosion-resistant coating onto the surface of the pretreated steel wire, and then cure it at 180℃ for 20 minutes. The corrosion-resistant coating is cured to form a corrosion-resistant coating, thus obtaining corrosion-resistant steel wire.

[0058] T3. Take 7 corrosion-resistant steel wires and twist them into strands to obtain corrosion-resistant steel strand.

[0059] Example 2 A corrosion-resistant steel strand differs from Example 1 in that the raw material ratio of the corrosion-resistant coating is different, and the raw material ratio is shown in Table 1.

[0060] Example 3 A corrosion-resistant steel strand differs from Example 1 in that the raw material ratio of the corrosion-resistant coating is different, and the raw material ratio is shown in Table 1.

[0061] Example 4 A corrosion-resistant steel strand differs from Example 1 in that the source of the modified silica in the raw materials of the corrosion-resistant coating is different, and the modified silica is prepared by the method of Preparation Example 2.

[0062] Example 5 A corrosion-resistant steel strand differs from Example 1 in that the source of the modified silica in the raw materials of the corrosion-resistant coating is different, and the modified silica is prepared by the method of Preparation Example 3.

[0063] Comparative Example Comparative Example 1 A corrosion-resistant steel strand differs from Example 1 in that, in the raw materials of the corrosion-resistant coating, an equal amount of water is used to replace ethyl 2-hydroxy-2-methyl-3-oxobutyrate.

[0064] Comparative Example 2 A corrosion-resistant steel strand differs from Example 1 in that the modified silica is replaced with an equal amount of silica in the raw materials of the corrosion-resistant coating.

[0065] Comparative Example 3 A corrosion-resistant steel strand differs from Example 1 in that, in the preparation method of modified silica in the raw materials of the corrosion-resistant coating, an equal amount of N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt is used to replace 10-undecenoyl hydrazine.

[0066] Comparative Example 4 A corrosion-resistant steel strand differs from Example 1 in that, in the preparation method of modified silica in the raw materials of the corrosion-resistant coating, an equal amount of 10-undecenoyl hydrazine replaces N,N-dimethyl (methacryloyloxyethyl) aminopropanesulfonic acid inner salt.

[0067] Performance testing (1) The corrosion-resistant coatings obtained in Examples 1-5 and Comparative Examples 1-4 were taken as samples, and the corrosion-resistant coatings were sprayed onto the surface of the steel plate. Then, the coatings were cured at 180°C for 20 minutes to form a corrosion-resistant coating with a thickness of 10 μm. The corrosion-resistant coating was then tested, and the test results are shown in Table 2.

[0068] In accordance with GB / T9286-2021 "Cross-cut test for paints and varnishes", the adhesion level of corrosion-resistant coatings was tested, and among the 1-5 levels, the higher the level number, the more severe the peeling.

[0069] According to GB 1768-2006 "Determination of Abrasion Resistance of Paints and Varnishes - Rotary Rubber Grinding Wheel Method", the abrasion resistance of corrosion-resistant coatings was tested and the mass loss was calculated.

[0070] (2) The corrosion-resistant steel wires obtained in step T2 of Examples 1-5 and Comparative Examples 1-4 were taken as samples, and the corrosion-resistant coating on the surface of the corrosion-resistant steel wires was tested. The test results are shown in Table 2.

[0071] The following method was used to test the resistance to neutral salts: at a temperature of 23°C, the sample was immersed in a 5% sodium chloride aqueous solution and the corrosion-resistant coating was observed to see if it changed. If softening or bubbles appeared, the sample was removed and the immersion time in 5% sodium chloride was calculated.

[0072] The alkali resistance was tested using the following method: at a temperature of 23°C, the sample was immersed in a 5% sodium hydroxide aqueous solution and the corrosion-resistant coating was observed to see if any changes occurred. If softening or bubbles appeared, the sample was removed and the immersion time in 5% sodium hydroxide was calculated.

[0073] The acid resistance was tested using the following method: at a temperature of 23°C, the sample was immersed in a 5% hydrochloric acid aqueous solution, and the corrosion-resistant coating was observed to see if it changed. If softening or bubbles appeared, the sample was removed, and the immersion time in 5% hydrochloric acid was calculated.

[0074] Table 2 Detection Results As shown in Table 2, the corrosion-resistant coating of this application cures to form a corrosion-resistant coating with high adhesion, achieving an adhesion grade of 1, indicating superior adhesion. It also exhibits low mass loss, at 4.3-5.8 mg / 1000 rpm, demonstrating superior abrasion resistance. Furthermore, it demonstrates high resistance to immersion in 5% sodium chloride, 5% sodium hydroxide, and 5% hydrochloric acid, with immersion times of 1464-1560 h for 5% sodium chloride, 1296-1392 h for 5% sodium hydroxide, and 1152-1248 h for 5% hydrochloric acid, exhibiting superior corrosion resistance. This corrosion-resistant coating, characterized by high adhesion, high abrasion resistance, and high corrosion resistance, when applied to steel wire to obtain corrosion-resistant steel strand, provides the steel strand with superior corrosion resistance, extends its service life, and meets market demands.

[0075] Example 1 and Comparative Example 1 were compared. The raw materials for the corrosion-resistant coating of Comparative Example 1 did not contain ethyl 2-hydroxy-2-methyl-3-oxobutyrate; the raw materials for the corrosion-resistant coating of Example 1 contained ethyl 2-hydroxy-2-methyl-3-oxobutyrate. This shows that adding ethyl 2-hydroxy-2-methyl-3-oxobutyrate to the raw materials can increase the crosslinking density of the corrosion-resistant coating, enhance interfacial bonding, and improve adhesion, abrasion resistance, and corrosion resistance.

[0076] Examples 1 and Comparative Examples 2-4 were compared. In Comparative Example 2, silica was added to the raw materials of the corrosion-resistant coating; in Comparative Example 3, modified silica was added to the raw materials, and the silica was treated with 3-allyloxypropyltrimethoxysilane and N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt; in Comparative Example 4, modified silica was added to the raw materials of the corrosion-resistant coating, and the silica was treated with 3-allyloxypropyltrimethoxysilane and 10-undecenoylhydrazine; in Example 1, modified silica was added to the raw materials of the corrosion-resistant coating, and the silica was treated with 3-allyloxypropyltrimethoxysilane, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, and 10-undecenoylhydrazine. This shows that modifying silica can improve its performance in corrosion-resistant coatings. Furthermore, based on the grafting of 3-allyloxypropyltrimethoxysilane onto the silica surface, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt and 10-undecenoyl hydrazide are further grafted to increase the number of active sites. The synergistic effect between these sites is utilized to improve adhesion and wear resistance, increase the stability of the corrosion-resistant coating, and effectively improve corrosion resistance, thereby enhancing the corrosion resistance of the corrosion-resistant steel strand and extending its service life.

[0077] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A corrosion-resistant steel strand, characterized in that: It is made of multiple corrosion-resistant steel wires twisted together, wherein the corrosion-resistant steel wires include steel wires, and the outer circumferential surface of the steel wires is provided with a corrosion-resistant coating, which is formed by curing corrosion-resistant paint; The corrosion-resistant coating is mainly made of the following raw materials in weight percentages: 45-55% water-based hydroxy acrylic dispersion, 3-5% blocked isocyanate curing agent, 5-10% ethyl 2-hydroxy-2-methyl-3-oxobutyrate, 4-6% modified silica, 0.3-1% silane coupling agent, 0.3-1% wetting agent, 0.3-1% leveling agent, 0.1-0.5% defoamer, 0.1-0.5% thickener, and the balance being deionized water; the modified silica is obtained by treating silica with 3-allyloxypropyltrimethoxysilane, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, and 10-undecenoyl hydrazine.

2. The corrosion-resistant steel strand according to claim 1, characterized in that: The modified silica is prepared by the following method: S1. Mix water and silica, add 3-allyloxypropyltrimethoxysilane, stir for 1-3 hours, filter, and obtain pretreated silica. S2. Mix water and emulsifier, add pretreated silica and mix, add N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt and 10-undecenoyl hydrazine and mix, add initiator, stir and treat for 1-3 hours, filter, wash and dry to obtain modified silica.

3. The corrosion-resistant steel strand according to claim 2, characterized in that: The weight ratio of silicon dioxide, 3-allyloxypropyltrimethoxysilane, N,N-dimethyl(methacryloyloxyethyl)aminopropanesulfonic acid inner salt, and 10-undecenoyl hydrazine is 100:(9-11):(7-9):(4-6).

4. The corrosion-resistant steel strand according to claim 2, characterized in that: The weight ratio of silicon dioxide to initiator is 100:(2-3).

5. The corrosion-resistant steel strand according to claim 2, characterized in that: The average particle size of the silica is 10-100 nm.

6. The corrosion-resistant steel strand according to claim 1, characterized in that: The blocked isocyanate curing agent is one or more of JX-616 curing agent, ZS-2601 curing agent, HD-8035 curing agent, and WD-8670 curing agent.

7. The corrosion-resistant steel strand according to claim 1, characterized in that: The silane coupling agent is one or more of 3-allyloxypropyltrimethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, vinyltriethoxysilane, and 3-aminopropyltriethoxysilane. The wetting agent is one or more of TEGO Wet 260 wetting agent, BYK-348 wetting agent, HY-4000 wetting agent, and GP WR-301 wetting agent; The leveling agent is one or more of TEGO Flow 300 leveling agent, LAG-925 leveling agent, EFKA-3777 leveling agent, and BYK-330 leveling agent; The defoamer is one or more of FoamStar SI 2280 defoamer, YRXP-08W defoamer, BD-303 defoamer, and BYK-018 defoamer; The thickener is one or more of Thixol 53L thickener, COAPUR 830W thickener, TT-935 thickener, and TEGOViscoPlus 3030 thickener.

8. The corrosion-resistant steel strand according to claim 1, characterized in that: The corrosion-resistant coating is prepared by the following method: waterborne hydroxy acrylic dispersion, blocked isocyanate curing agent, ethyl 2-hydroxy-2-methyl-3-oxobutyrate, modified silica, silane coupling agent, wetting agent, leveling agent, defoamer, thickener, and deionized water are mixed to obtain the corrosion-resistant coating.

9. A method for preparing corrosion-resistant steel strand as described in any one of claims 1-8, characterized in that: Includes the following steps: T1. Pickle, wash with water and dry the steel wire to obtain pretreated steel wire; T2. Spray the corrosion-resistant coating onto the surface of the pretreated steel wire, and cure it. The corrosion-resistant coating is cured to form a corrosion-resistant coating, thus obtaining corrosion-resistant steel wire. T3. Take multiple corrosion-resistant steel wires and twist them into strands to obtain corrosion-resistant steel strands.

10. The method for preparing a corrosion-resistant steel strand according to claim 9, characterized in that: In the curing process of step T2, the curing temperature is 170-190℃ and the time is 10-30min.

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