A high-strength corrosion-resistant steel strand and its manufacturing process

Abstract

This invention relates to the field of steel strand technology, and proposes a high-strength, corrosion-resistant steel strand and its manufacturing process. The steel strand includes bare strand and an epoxy coating sprayed onto the surface of the bare strand. The epoxy coating comprises the following components by weight: 150 parts epoxy resin, 15-30 parts furan resin, 10-55 parts chlorosulfonated polyethylene, 20-40 parts aluminum nitride, 3-5 parts degassing agent, and 2-6 parts curing agent. This technical solution solves the problem of poor strength and corrosion resistance of epoxy coatings on steel strands in related technologies.

Description

Technical Field

[0001] This invention relates to the field of steel strand technology, specifically to a high-strength corrosion-resistant steel strand and its manufacturing process. Background Technology

[0002] Steel strand is a metal product made of multiple strands of steel wire twisted together. It can be used as a load-bearing cable, guy wire, and reinforcing core, and is widely used in bridges, construction, water conservancy, energy, and geotechnical engineering. Steel strand can be classified according to its surface coating, such as galvanized steel strand, epoxy-coated steel strand, and aluminum-clad steel strand. Among them, epoxy-coated steel strand is highly favored by the market due to its high surface hardness and good wear resistance.

[0003] Currently, epoxy-coated steel strands suffer from poor epoxy coating strength and corrosion resistance, which makes them susceptible to exposure to harsh natural environments, thus shortening their service life. Therefore, developing a steel strand with high epoxy coating strength and good corrosion resistance is of great significance. Summary of the Invention

[0004] This invention proposes a high-strength corrosion-resistant steel strand and its production process, which solves the problem of poor strength and corrosion resistance of epoxy coatings on steel strands in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes a high-strength corrosion-resistant steel strand, comprising bare strand and an epoxy coating sprayed on the surface of the bare strand. The epoxy coating comprises the following components by weight: 150 parts epoxy resin, 15-30 parts furan resin, 10-55 parts chlorosulfonated polyethylene, 20-40 parts aluminum nitride, 3-5 parts degassing agent, and 2-6 parts curing agent.

[0007] As a further technical solution, the material of the bare stranded wire includes one of 60Si2Mn, SWRH82BCr, and 82MnA.

[0008] As a further technical solution, the number of strands in the bare stranded wire is 7 to 19.

[0009] As a further technical solution, the weight ratio of furan resin to chlorosulfonated polyethylene is 1:1 to 1.5.

[0010] In this invention, when the weight ratio of furan resin to chlorosulfonated polyethylene is 1:1 to 1.5, it helps to further improve the strength and corrosion resistance of the epoxy coating on the steel strand.

[0011] As a further technical solution, the chlorine content of the chlorosulfonated polyethylene is ≥40wt%.

[0012] In this invention, when the chlorine content of chlorosulfonated polyethylene is ≥40wt%, it helps to further improve the strength and corrosion resistance of the epoxy coating on the steel strand.

[0013] As a further technical solution, the aluminum nitride is modified aluminum nitride, and the components of the modified aluminum nitride include aluminum nitride, o-carboxyphenylacetic acid and p-nitrophenol.

[0014] In this invention, although the addition of aluminum nitride can enhance the strength and corrosion resistance of the epoxy coating of steel strand, the inventors discovered that by using o-carboxyphenylacetic acid and p-nitrophenol to modify the surface of aluminum nitride, the strength and corrosion resistance of the epoxy coating of steel strand can be further improved. It is speculated that this is because the modified aluminum nitride can form chemical crosslinks with the polymer resin inside the epoxy coating of steel strand, further enhancing the complexity of the internal space of the epoxy coating.

[0015] As a further technical solution, in the modified aluminum nitride, the weight ratio of aluminum nitride to o-carboxyphenylacetic acid and p-nitrophenol is 10~16:1:1.

[0016] In this invention, when the weight ratio of aluminum nitride, o-carboxyphenylacetic acid, and p-nitrophenol in the modified aluminum nitride is 10~16:1:1, it helps to further improve the strength and corrosion resistance of the epoxy coating on the steel strand.

[0017] As a further technical solution, the preparation method of the modified aluminum nitride includes the following steps: dissolving o-carboxyphenylacetic acid and p-nitrophenol in ethanol, adding aluminum nitride and dispersing it evenly, drying it, and obtaining the modified aluminum nitride.

[0018] As a further technical solution, the degassing agent is polyamide wax micro powder or degassing agent KT961.

[0019] In this invention, the addition of a degassing agent can remove air bubbles, thereby improving the overall quality of the epoxy coating on the steel strand.

[0020] As a further technical solution, the curing agent includes one or more of aromatic amines, polyamides, and 2-methylimidazole.

[0021] The present invention also proposes a production process for the high-strength corrosion-resistant steel strand, comprising the following steps:

[0022] S1. Blend the raw materials for epoxy coating, extrude, granulate, and obtain masterbatch;

[0023] S2. The masterbatch is sprayed onto the surface of the bare stranded wire to obtain steel stranded wire.

[0024] As a further technical solution, in step S1, the temperature during extrusion is 150~180℃.

[0025] As a further technical solution, the epoxy coating thickness in the steel strand is 0.1~0.2mm.

[0026] The working principle and beneficial effects of this invention are as follows:

[0027] In this invention, the raw materials for the epoxy coating of the steel strand include furan resin and chlorosulfonated polyethylene. The active groups of these two materials synergistically interact with the epoxy resin, increasing the complexity of the internal space of the epoxy coating. This enhances the coating's resistance to external forces and improves its strength, while also preventing the penetration of corrosive substances and improving its corrosion resistance. Furthermore, the addition of aluminum nitride serves both as inorganic particle reinforcement and imparts excellent corrosion resistance to the epoxy coating of the steel strand. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] In the following examples and comparative examples, unless otherwise specified, the bare stranded wire is made of SWRH82BCr with 7 strands; the epoxy resin is BE-507; the furan resin is HK-3; and the aluminum nitride has a particle size of 500 mesh.

[0030] Example 1

[0031] A manufacturing process for high-strength, corrosion-resistant steel strand includes the following steps:

[0032] S1. By weight, 150 parts of epoxy resin, 15 parts of furan resin, 10 parts of chlorosulfonated polyethylene (model CSM-3305, chlorine content of 33wt%~37wt%, sulfur content of 0.8wt%~1.2wt%), 20 parts of aluminum nitride, 3 parts of degassing agent KT961 and 2 parts of 2-methylimidazole are blended, extruded and granulated to obtain masterbatch;

[0033] During extrusion, the temperature in zone one is 160℃, the temperature in zone two is 180℃, and the temperature in zone three is 150℃.

[0034] S2. Spray the masterbatch onto the surface of the bare stranded wire to obtain steel stranded wire;

[0035] In the steel strand, the epoxy coating thickness is 0.2 mm.

[0036] Example 2

[0037] A manufacturing process for high-strength, corrosion-resistant steel strand includes the following steps:

[0038] S1. By weight, 150 parts of epoxy resin, 30 parts of furan resin, 55 parts of chlorosulfonated polyethylene (model CSM-3305, chlorine content of 33wt%~37wt%, sulfur content of 0.8wt%~1.2wt%), 40 parts of aluminum nitride, 5 parts of degassing agent KT961 and 6 parts of 2-methylimidazole are blended, extruded and granulated to obtain masterbatch;

[0039] During extrusion, the temperature in zone one is 160℃, the temperature in zone two is 180℃, and the temperature in zone three is 150℃.

[0040] S2. Spray the masterbatch onto the surface of the bare stranded wire to obtain steel stranded wire;

[0041] In the steel strand, the epoxy coating thickness is 0.2 mm.

[0042] Example 3

[0043] A manufacturing process for high-strength, corrosion-resistant steel strand includes the following steps:

[0044] S1. By weight, 150 parts of epoxy resin, 15 parts of furan resin, 35 parts of chlorosulfonated polyethylene (model CSM-3305, chlorine content of 33wt%~37wt%, sulfur content of 0.8wt%~1.2wt%), 36 parts of aluminum nitride, 5 parts of degassing agent KT961 and 6 parts of 2-methylimidazole are blended, extruded and granulated to obtain masterbatch;

[0045] During extrusion, the temperature in zone one is 160℃, the temperature in zone two is 180℃, and the temperature in zone three is 150℃.

[0046] S2. Spray the masterbatch onto the surface of the bare stranded wire to obtain steel stranded wire;

[0047] In the steel strand, the epoxy coating thickness is 0.2 mm.

[0048] Example 4

[0049] The only difference between this embodiment and Embodiment 3 is that in this embodiment, the weight parts of furan resin are 30 parts and the weight parts of chlorosulfonated polyethylene are 20 parts.

[0050] Example 5

[0051] The only difference between this embodiment and Embodiment 3 is that, in this embodiment, the weight parts of furan resin are 25 parts and the weight parts of chlorosulfonated polyethylene are 25 parts.

[0052] Example 6

[0053] The only difference between this embodiment and Embodiment 3 is that in this embodiment, the weight parts of furan resin are 20 parts and the weight parts of chlorosulfonated polyethylene are 30 parts.

[0054] Example 7

[0055] The only difference between this embodiment and Embodiment 6 is that, in this embodiment, the chlorosulfonated polyethylene resin is of type CSM-4010, with a chlorine content of 40wt%~45wt% and a sulfur content of 0.8wt%~1.2wt%.

[0056] Example 8

[0057] The only difference between this embodiment and Embodiment 7 is that in this embodiment, aluminum nitride is modified aluminum nitride. The preparation method of modified aluminum nitride includes the following steps: dissolving 2 parts of o-carboxyphenylacetic acid in 40 parts of ethanol, adding 34 parts of aluminum nitride and dispersing evenly, drying, to obtain modified aluminum nitride.

[0058] Example 9

[0059] The only difference between this embodiment and Example 8 is that, in this embodiment, when preparing modified aluminum nitride, o-carboxyphenylacetic acid is replaced with an equal amount of p-nitrophenol.

[0060] Example 10

[0061] The only difference between this embodiment and Example 8 is that, in this embodiment, when preparing modified aluminum nitride, 2 parts of o-carboxyphenylacetic acid are replaced with 1 part of o-carboxyphenylacetic acid and 1 part of p-nitrophenol.

[0062] Example 11

[0063] The only difference between this embodiment and Example 10 is that, in this embodiment, when preparing modified aluminum nitride, the weight parts of aluminum nitride are 28 parts, the weight parts of o-carboxyphenylacetic acid are 4 parts, and the weight parts of p-nitrophenol are 4 parts.

[0064] Example 12

[0065] The only difference between this embodiment and Example 10 is that, in this embodiment, when preparing modified aluminum nitride, the weight parts of aluminum nitride are 30 parts, the weight parts of o-carboxyphenylacetic acid are 3 parts, and the weight parts of p-nitrophenol are 3 parts.

[0066] Example 13

[0067] The only difference between this embodiment and Example 10 is that, in this embodiment, when preparing modified aluminum nitride, the weight parts of aluminum nitride are 32 parts, the weight parts of o-carboxyphenylacetic acid are 2 parts, and the weight parts of p-nitrophenol are 2 parts.

[0068] Comparative Example 1

[0069] The only difference between this comparative example and Example 1 is that in this comparative example, no furan resin was added, and the amount of chlorosulfonated polyethylene added was 25 parts.

[0070] Comparative Example 2

[0071] The only difference between this comparative example and Example 1 is that chlorosulfonated polyethylene was not added in this comparative example, and the amount of furan resin added was 25 parts.

[0072] Comparative Example 3

[0073] The only difference between this comparative example and Example 1 is that furan resin and chlorosulfonated polyethylene were not added in this comparative example.

[0074] Comparative Example 4

[0075] The only difference between this comparative example and Example 1 is that aluminum nitride was not added in this comparative example.

[0076] The epoxy coatings of the steel strands in Examples 1-13 and Comparative Examples 1-4 were subjected to the following performance tests:

[0077] ①Tensile strength: The coating was cut into strips of 25mm×150mm×0.2mm and its tensile strength was tested using a WDW-5 single-arm microcomputer-controlled electronic tensile testing machine. The test speed was 10mm / min.

[0078] ② Mass loss rate: A neutral salt spray test was conducted for 480 hours in accordance with GB / T 10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test" to determine the mass loss rate. The test temperature was 35℃ and the concentration of sodium chloride solution was 50g / L.

[0079] The test results are shown in Table 1 below.

[0080] Table 1 Test Results

[0081]

[0082] A comparison of Example 1 and Comparative Examples 1-3 shows that the synergistic effect of furan resin and chlorosulfonated polyethylene can significantly improve the strength and corrosion resistance of the epoxy coating on steel strands. A comparison of Example 1 and Comparative Example 4 shows that the addition of aluminum nitride is beneficial to improving the strength and corrosion resistance of the epoxy coating on steel strands.

[0083] A comparison of Examples 3-4 and Examples 5-6 shows that when the weight ratio of furan resin to chlorosulfonated polyethylene is 1:1-1.5, it helps to further improve the strength and corrosion resistance of the epoxy coating on the steel strand. A comparison of Examples 6 and 7 shows that when the chlorine content of the chlorosulfonated polyethylene is ≥40wt%, it helps to further improve the strength and corrosion resistance of the epoxy coating on the steel strand.

[0084] A comparison of Examples 7 and 8-13 shows that surface modification of aluminum nitride can further improve the strength and corrosion resistance of the epoxy coating on steel strands. A comparison of Examples 8-9 and 10 shows that, compared to modifying aluminum nitride alone with o-carboxyphenylacetic acid or p-nitrophenol alone, using both o-carboxyphenylacetic acid and p-nitrophenol to modify aluminum nitride can further improve the strength and corrosion resistance of the epoxy coating on steel strands. A comparison of Examples 10-11 and 12-13 shows that when the weight ratio of aluminum nitride to o-carboxyphenylacetic acid and p-nitrophenol in the modified aluminum nitride is 10-16:1:1, it helps to further improve the strength and corrosion resistance of the epoxy coating on steel strands.

[0085] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength, corrosion-resistant steel strand, comprising bare stranded wire and an epoxy coating sprayed onto the surface of the bare stranded wire, characterized in that, The raw materials for the epoxy coating include the following components in parts by weight: 150 parts epoxy resin, 15-30 parts furan resin, 10-55 parts chlorosulfonated polyethylene, 20-40 parts modified aluminum nitride, 3-5 parts degassing agent, and 2-6 parts curing agent. The modified aluminum nitride comprises aluminum nitride, o-carboxyphenylacetic acid, and p-nitrophenol; The method for preparing the modified aluminum nitride includes the following steps: dissolving o-carboxyphenylacetic acid and p-nitrophenol in ethanol, adding aluminum nitride and dispersing it evenly, and drying it to obtain the modified aluminum nitride.

2. The high-strength corrosion-resistant steel strand according to claim 1, characterized in that, The weight ratio of furan resin to chlorosulfonated polyethylene is 1:1 to 1.

5.

3. The high-strength corrosion-resistant steel strand according to claim 1, characterized in that, The chlorine content of the chlorosulfonated polyethylene is ≥40wt%.

4. The high-strength corrosion-resistant steel strand according to claim 1, characterized in that, In the modified aluminum nitride, the weight ratio of aluminum nitride to o-carboxyphenylacetic acid and p-nitrophenol is 10~16:1:

1.

5. A high-strength corrosion-resistant steel strand according to any one of claims 1 to 4, characterized in that, The degassing agent is polyamide wax powder or degassing agent KT961.

6. A high-strength corrosion-resistant steel strand according to any one of claims 1 to 4, characterized in that, The curing agent includes one or more of aromatic amines, polyamides, and 2-methylimidazoles.

7. A production process for high-strength corrosion-resistant steel strand as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Blend the raw materials for epoxy coating, extrude, granulate, and obtain masterbatch; S2. The masterbatch is sprayed onto the surface of the bare stranded wire to obtain steel stranded wire.

8. The production process of a high-strength corrosion-resistant steel strand according to claim 7, characterized in that, In step S1, the extrusion temperature is 150~180℃.

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