High-strength steel strand and process for producing the same

Abstract

The application relates to the technical field of steel strands, and discloses a high-strength steel strand and a production process thereof. The high-strength steel strand comprises a bare strand and a resin coating from inside to outside in sequence. The raw material of the resin coating comprises the following components in parts by weight: 100 parts of epoxy resin, 5-10 parts of modified alumina as a modifier, 8-12 parts of a curing agent, 3-8 parts of a curing accelerator, 10-20 parts of a diluent, and tetrasodium iminodisuccinate and / or 3,4,5-tricarboxylic aniline as the modifier of the modified alumina. The above technical scheme solves the problem of low strength of the steel strand in the related art.

Description

Technical Field

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

[0002] Steel strand is a steel product made of multiple strands of steel wire twisted together. It features good toughness, corrosion resistance, and low relaxation, and is widely used in construction, railway, and highway engineering. It can be used in prestressed concrete components, track slabs, highway guardrails, and cableways. However, due to the special operating environment of steel strand, its strength currently needs further improvement. Summary of the Invention

[0003] This invention proposes a high-strength steel strand and its manufacturing process, which solves the problem of low strength of steel strand in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a high-strength steel strand, comprising, from the inside out, bare strand and a resin coating. The resin coating comprises the following components by weight: 100 parts epoxy resin, 5-10 parts modified alumina, 8-12 parts curing agent, 3-8 parts curing accelerator, and 10-20 parts diluent. The modifier for the modified alumina is tetrasodium iminodisuccinate and / or aniline 3,4,5-tricarboxylic acid.

[0006] As a further technical solution, the raw materials for the modifier-modified alumina include a modifier and alumina in a mass ratio of 0.01~0.2:10.

[0007] As a further technical solution, the raw materials for the modifier-modified alumina include a modifier and alumina in a mass ratio of 0.05~0.1:10.

[0008] The present invention modifies the alumina raw material by using a modifier in a mass ratio of 0.05 to 0.1:10, which further enhances the strength of the steel strand.

[0009] As a further technical solution, the modifier for the modified alumina includes tetrasodium iminodisuccinate and aniline 3,4,5-tricarboxylic acid in a mass ratio of 1:9 to 9:1.

[0010] This invention further enhances the strength of steel strands by using a compound of tetrasodium iminodisuccinate and aniline 3,4,5-tricarboxylic acid in a mass ratio of 1:9 to 9:1.

[0011] As a further technical solution, the mass of the tetrasodium iminodisuccinate is ≤ the mass of aniline 3,4,5-tricarboxylic acid.

[0012] This invention further enhances the strength of steel strands by limiting the mass of tetrasodium iminodisuccinate to ≤ the mass of aniline 3,4,5-tricarboxylic acid.

[0013] As a further technical solution, the mass ratio of the tetrasodium iminodisuccinate and aniline 3,4,5-tricarboxylic acid is 1:3~4.

[0014] This invention further enhances the strength of steel strands by limiting the mass ratio of tetrasodium iminodisuccinate and aniline 3,4,5-tricarboxylic acid to 1:3~4.

[0015] As a further technical solution, the diluent is the reactive diluent AGE.

[0016] As a further technical solution, the curing agent is a latent curing agent, and the latent curing agent is one or more of SH-900, SH-500, and SH-300.

[0017] As a further technical solution, the curing accelerator is SH-A100.

[0018] As a further technical solution, the preparation method of the modifier-modified alumina includes the following steps: dissolving the modifier in water, adding alumina and mixing evenly, filtering, and drying to obtain the modifier-modified alumina.

[0019] This invention proposes a production process for high-strength steel strand, which includes the following steps: impregnating bare stranded wire in a resin coating and curing it to obtain high-strength steel strand.

[0020] The working principle and beneficial effects of this invention are as follows:

[0021] In this invention, the strength of the steel strand is improved by modifying alumina and selecting tetrasodium iminodisuccinate and / or aniline 3,4,5-tricarboxylic acid as modifiers for the modified alumina. The amino groups of tetrasodium iminodisuccinate and / or aniline 3,4,5-tricarboxylic acid bind to the hydroxyl groups on the surface of alumina through hydrogen bonds, and the carboxyl groups interact with the metal on the surface of the bare strand in the form of coordinate bonds, thereby enhancing the adhesion between the resin coating and the bare strand. At the same time, by adjusting the content of each component of the raw materials in the resin coating, the strength of the resin coating is optimized, thereby improving the strength of the steel strand. Detailed Implementation

[0022] 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.

[0023] The parameters of the raw materials used in the following examples and comparative examples are as follows:

[0024] The epoxy resin is E51;

[0025] The particle size of alumina is 30 nm.

[0026] Example 1

[0027] A steel strand, the preparation method of which includes the following steps:

[0028] S1. Dissolve 0.01 parts of tetrasodium iminodisuccinate in 15 parts of water, add 10 parts of alumina, mix well, filter, and dry to obtain modifier-modified alumina.

[0029] S2. Mix 100 parts of epoxy resin and 10 parts of reactive diluent AGE and stir evenly under nitrogen protection. Then add 5 parts of modified alumina, 8 parts of SH-900 and 3 parts of SH-A100 modifier and stir evenly to remove bubbles and obtain resin coating.

[0030] S3. Impregnate the bare stranded wire in resin coating and cure to obtain steel stranded wire.

[0031] Example 2

[0032] A steel strand, the preparation method of which includes the following steps:

[0033] S1. Dissolve 0.2 parts of tetrasodium iminodisuccinate in 15 parts of water, add 10 parts of alumina, mix well, filter, and dry to obtain modifier-modified alumina.

[0034] S2. Mix 100 parts of epoxy resin and 20 parts of reactive diluent AGE and stir evenly under nitrogen protection. Then add 5 parts of modified alumina, 8 parts of SH-900 and 3 parts of SH-A100 modifier and stir evenly to remove bubbles and obtain resin coating.

[0035] S3. Impregnate the bare stranded wire in resin coating and cure to obtain steel stranded wire.

[0036] Example 3

[0037] The only difference from Example 1 is that 0.2 parts of tetrasodium iminodisuccinate were used.

[0038] Example 4

[0039] The only difference from Example 1 is that 0.05 parts of tetrasodium iminodisuccinate were used.

[0040] Example 5

[0041] The only difference from Example 1 is that 0.1 parts of tetrasodium iminodisuccinate were used.

[0042] Example 6

[0043] The only difference from Example 5 is that the tetrasodium iminodisuccinate is replaced with an equal amount of aniline 3,4,5-tricarboxylic acid.

[0044] Example 7

[0045] A steel strand, the preparation method of which includes the following steps:

[0046] S1. Dissolve 0.01 parts of tetrasodium iminodisuccinate and 0.09 parts of aniline 3,4,5-tricarboxylic acid in 15 parts of water, add 10 parts of alumina, mix well, filter, and dry to obtain modifier-modified alumina.

[0047] S2. Mix 100 parts of epoxy resin and 10 parts of reactive diluent AGE and stir evenly under nitrogen protection. Then add 5 parts of modified alumina, 8 parts of SH-900 and 3 parts of SH-A100 modifier and stir evenly to remove bubbles and obtain resin coating.

[0048] S3. Impregnate the bare stranded wire in resin coating and cure to obtain steel stranded wire.

[0049] Example 8

[0050] The only difference from Example 7 is that: 0.09 parts of tetrasodium iminodisuccinate and 0.01 parts of aniline 3,4,5-tricarboxylic acid.

[0051] Example 9

[0052] The only difference from Example 7 is that: 0.05 parts of tetrasodium iminodisuccinate and 0.05 parts of aniline 3,4,5-tricarboxylic acid.

[0053] Example 10

[0054] The only difference from Example 7 is that: 0.025 parts of tetrasodium iminodisuccinate and 0.075 parts of aniline 3,4,5-tricarboxylic acid.

[0055] Example 11

[0056] The only difference from Example 7 is that: 0.02 parts of tetrasodium iminodisuccinate and 0.08 parts of aniline 3,4,5-tricarboxylic acid.

[0057] Comparative Example 1

[0058] S1. Mix 100 parts of epoxy resin and 10 parts of reactive diluent AGE and stir evenly under nitrogen protection. Then add 5 parts of alumina, 8 parts of SH-900 and 3 parts of SH-A100 and stir evenly. Degas to obtain resin coating.

[0059] S2. Impregnate the bare stranded wire in resin coating and cure to obtain steel stranded wire.

[0060] Test case

[0061] The resin coatings prepared in Examples 1-11 and Comparative Example 1 were coated on the surface of 82MnA steel sheets with a thickness of 0.15 mm. After curing, the adhesion level was tested according to the cross-cutting method in GB / T 31586.2-2015 standard.

[0062] The steel strands prepared in Examples 1-11 and Comparative Example 1 were subjected to tensile strength tests in accordance with the standard GB / T 228.1-2021. The average value of the test results of the five samples was taken as the final result, and the results are shown in Table 1.

[0063] Table 1. Test results of resin coating adhesion grade and steel strand tensile strength of Examples 1-11 and Comparative Example 1

[0064]

[0065] Compared with Comparative Example 1, Examples 1 and 3-11 used a modifier to modify alumina. As a result, the adhesion of the resin coatings prepared in Examples 1 and 3-11 was better than that in Comparative Example 1, and the tensile strength of the steel strands prepared in Examples 1 and 3-11 was higher than that in Comparative Example 1. This shows that by using a modifier to modify alumina, the adhesion of the resin coating to the bare strand and the strength of the steel strand can be enhanced.

[0066] Compared with Examples 1 and 3, the steel strands prepared in Examples 4 and 5 contained a modifier and alumina in a mass ratio of 0.05 to 0.1:10. As a result, the tensile strength of Examples 4 and 5 was higher than that of Examples 1 and 3, indicating that by limiting the mass ratio of modifier to alumina in the modifier-modified alumina to 0.05 to 0.1:10, the strength of the steel strands was further enhanced.

[0067] Compared with Examples 5-6, the steel strands prepared in Examples 7-11 were prepared by a combination of tetrasodium iminodisuccinate and aniline 3,4,5-tricarboxylic acid. As a result, the tensile strength of Examples 7-11 was higher than that of Examples 5-6, indicating that the strength of the steel strands was further enhanced by the combination of tetrasodium iminodisuccinate and aniline 3,4,5-tricarboxylic acid.

[0068] Compared with Example 8, the mass of tetrasodium iminodisuccinate in the steel strands prepared in Examples 7 and 9-11 was ≤ the mass of aniline 3,4,5-tricarboxylic acid. As a result, the tensile strength of Examples 7 and 9-11 was higher than that of Example 8, indicating that by limiting the mass of tetrasodium iminodisuccinate to ≤ the mass of aniline 3,4,5-tricarboxylic acid, the strength of the steel strand was further enhanced.

[0069] Compared with Example 7, the steel strands prepared in Examples 10-11 had a mass ratio of tetrasodium iminodisuccinate to aniline 3,4,5-tricarboxylic acid of 1:3-4. As a result, the tensile strength of Examples 10-11 was higher than that of Example 7, indicating that by limiting the mass ratio of tetrasodium iminodisuccinate to aniline 3,4,5-tricarboxylic acid of 1:3-4, the strength of the steel strand was further enhanced.

[0070] 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 steel strand characterized in that, The resin coating includes bare stranded wire and resin coating in turn from inside to outside, raw materials of the resin coating include the following components by weight: epoxy resin 100 parts, modified alumina modified by modifier 5-10 parts, curing agent 8-12 parts, curing accelerator 3-8 parts, diluent 10-20 parts, the modifier of the modified alumina modified by modifier is tetrasodium salt of iminodisuccinic acid with 3,4,5-tricarboxylic acid aniline in a mass ratio of 1:9-9:1; The mass of the tetrasodium salt of iminodisuccinic acid is ≤ the mass of 3,4,5-tricarboxylic acid aniline. Raw materials of the modified alumina modified by modifier include modifier and alumina in a mass ratio of 0.01-0.2:

10.

2. A high strength steel strand as claimed in claim 1, characterized in that, Raw materials of the modified alumina modified by modifier include modifier and alumina in a mass ratio of 0.05-0.1:

10.

3. A high strength steel strand as defined in claim 1, wherein The mass ratio of the tetrasodium salt of iminodisuccinic acid and 3,4,5-tricarboxylic acid aniline is 1:3-4.

4. A high strength steel strand as defined in claim 1, wherein, The diluent is active diluent AGE.

5. A high strength steel strand as defined in claim 1, wherein, The curing agent is latent curing agent.

6. A high strength steel strand according to any one of claims 1 to 5, characterized in that, The preparation method of the modified alumina modified by modifier includes the following steps: The modifier is dissolved in water, alumina is added and mixed uniformly, filtered, dried to obtain modified alumina modified by modifier.

7. The process according to any one of claims 1 to 6, characterized in that, It includes the following steps: The bare stranded wire is immersed in the resin coating, cured to obtain high-strength steel strand.

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