CN116446203A - High-strength steel wire rope core and preparation method thereof - Google Patents

Abstract

The invention provides a high-strength steel wire rope core, which comprises a central wire, a primary outer wire and an outer wire. The central wire is a steel wire bundle, and the steel wire bundle is formed by collecting 6-18 thin steel wire bundles; the secondary outer layer yarn is spirally wrapped with the central yarn, and comprises 4-12 first modified sisal hemp yarns; the outer layer wires are spirally wrapped and twisted with the secondary outer layer wires, the outer layer wires comprise first combined wires and second modified sisal hemp wires, and the second modified sisal hemp wires are arranged in gaps between adjacent first combined wires; the first combined wire comprises a second steel wire and a plurality of ultra-high molecular weight polyethylene wires, and the ultra-high molecular weight polyethylene wires are spirally wrapped around the second steel wire. Wherein the first modified sisal hemp thread and the second modified sisal hemp thread are both graphene oxide-polyethyleneimine modified sisal hemp threads. The multi-layer composite structure is adopted, so that the strength of the rope core of the steel wire rope is integrally improved, and the steel wire rope has high tensile property and supporting property.

Description

High-strength steel wire rope core and preparation method thereof

Technical Field

The invention relates to the technical field of steel wire rope cores, in particular to a high-strength steel wire rope core and a preparation method thereof.

Background

The steel wire rope is a spiral steel wire bundle formed by twisting steel wires with mechanical properties and geometric dimensions meeting the requirements together according to a certain rule, and consists of the steel wires, a rope core and lubricating grease. The steel wire rope has high strength, light dead weight, stable work, difficult sudden whole root breakage, reliable work and wide application in daily life. Because of the unique properties of steel wire ropes, steel wire ropes have been so far indispensable materials or components in the fields of metallurgy, mining, oil and gas drilling, machinery, chemical industry, aerospace and the like, and therefore, the quality of steel wire ropes is also paid attention to by a plurality of industries, wherein a steel wire rope core is a key ring for guaranteeing the quality of steel wire ropes.

When the steel wire rope is applied to engineering, the rope core plays a role in supporting in the radial direction and reducing the pressure between strands, and plays a main role in keeping the stable physical structure of the steel wire rope. Meanwhile, the steel wire rope core also has good oil-containing capacity so as to release grease to the steel wires for lubrication, and the friction acting force between the steel wires is reduced. Sisal belongs to hard fiber, has advantages such as high oil content, lubrication effect are good, so sisal rope core becomes the rope core commonly used in elevator wire rope, but adopts rope core tensile ability and the bearing ability that simple sisal made are weaker, is obviously less than the rope core that synthetic fiber made. The strength performance of the whole rope core is improved by optimizing the structure of the rope core and modifying sisal fibers, and meanwhile, the better oiliness is maintained, so that the comprehensive service performance of the steel wire rope core can be effectively improved, and the service safety of the steel wire rope is further improved.

Disclosure of Invention

The invention aims to provide a high-strength steel wire rope core and a preparation method thereof, which effectively improve the overall strength of the rope core, tensile resistance and flexibility, and have good oil storage effect.

The invention provides a high-strength steel wire rope core, which comprises a central wire, a primary outer wire and an outer wire, wherein the central wire is a steel wire bundle, and the steel wire bundle is formed by integrating 6-18 thin steel wire bundles; the secondary outer layer yarn is spirally wrapped with the central yarn, and the secondary outer layer yarn comprises 4-12 first modified sisal hemp yarns. The outer layer silk spiral package twists the secondary outer layer silk, outer layer silk includes first combination silk and second modified sword fibrilia, the second modified sword fibrilia sets up the clearance at adjacent first combination silk. The first combined wire comprises a second steel wire and a plurality of ultra-high molecular weight polyethylene wires, and the ultra-high molecular weight polyethylene wires are spirally wrapped around the second steel wire; wherein the first modified sisal hemp thread and the second modified sisal hemp thread are both graphene oxide-polyethyleneimine modified sisal hemp threads.

Preferably, the graphene oxide-polyethyleneimine modified sisal hemp thread is woven by a plurality of graphene oxide-polyethyleneimine modified sisal hemp fibers, and the modification step of the graphene oxide-polyethyleneimine modified sisal hemp fiber comprises the steps of alkali treatment, polyethyleneimine treatment and graphene oxide assembly.

Further preferably, the alkali treatment step is to soak a certain amount of sisal fibers in a 3% sodium hydroxide solution for 3-4 hours, then take out the sisal fibers, wash the sisal fibers with pure water to be neutral, and dry the sisal fibers at 70-75 ℃ to obtain the pretreated sisal fibers.

Further preferably, the polyethyleneimine treatment step is to place the pretreated sisal fibers in a 4wt% polyethyleneimine aqueous solution for 2 hours, then take out the pretreated sisal fibers and wash the pretreated sisal fibers with pure water for 4-5 times, and dry the pretreated sisal fibers at 80 ℃ to obtain second pretreated sisal fibers.

Further preferably, the graphene oxide assembly step comprises (1) immersing the second pretreated sisal fibers in a 3wt% aqueous polyethylenimine solution for 1.5 hours, and then taking out the second pretreated sisal fibers and washing with pure water for 4-5 times; (2) Dissolving graphene oxide in deionized water to prepare a 5% graphene oxide solution, soaking the second pretreated sisal fibers in the step (1) in the graphene oxide solution for 2 hours, filtering the graphene oxide solution, and flushing the second pretreated sisal fibers with pure water for 4-5 times; (3) And (3) drying the second pretreated sisal fiber in the step (2) to constant weight at 80 ℃ to obtain the graphene oxide-polyethyleneimine modified sisal fiber.

Preferably, the diameter of the second modified sisal hemp thread is 0.5-3 times of the diameter of the first modified sisal hemp thread.

Preferably, the diameter of the second steel wire is 2-7 times of the diameter of the fine steel wire, and the second steel wire and the fine steel wire are subjected to phosphating coating treatment.

Preferably, a polyethylene woven protection layer is arranged outside the outer layer wire.

The invention also provides a preparation method of the high-strength steel wire rope core, which is used for preparing the high-strength steel wire rope core and comprises the following steps of:

step 1, carrying out phosphating coating treatment on the fine steel wires and the second steel wires, and integrating a plurality of fine steel wire bundles into the central wire;

step 2, twisting the graphene oxide-polyethyleneimine modified sisal fibers into first modified sisal filaments and second modified sisal filaments with different diameters respectively, and simultaneously immersing the first modified sisal filaments and the second modified sisal filaments in oil;

step 3, helically wrapping and twisting the central yarn by the first modified sisal hemp yarn to obtain a secondary outer layer yarn, and spraying grease while twisting in the wrapping and twisting process;

step 4, taking a second steel wire and a plurality of ultra-high molecular weight polyethylene wires, and helically wrapping the ultra-high molecular weight polyethylene wires around the second steel wire by a strander to obtain the combined wire;

step 5, taking a plurality of combined filaments and a plurality of second modified sisal hemp filaments, arranging the combined filaments and the second modified sisal hemp filaments at intervals, and helically wrapping and twisting the combined filaments and the second modified sisal hemp filaments outside the secondary outer filaments by a strander to obtain the outer filaments;

step 6: taking polyethylene filaments as warp yarns and polyethylene pure spun staple yarns as weft yarns, winding and braiding the polyethylene filaments and the polyethylene pure spun staple yarns, and hot-pressing and compounding the polyethylene filaments and the polyethylene pure spun staple yarns outside the outer layer filaments to obtain the polyethylene braiding protective layer.

The invention has the following beneficial effects: the invention adopts a multi-layer composite structure by arranging the central wire, the secondary outer wire and the outer wire, thereby integrally improving the strength of the rope core of the steel wire rope and having high tensile strength and supporting property. The central wire is formed by integrating a plurality of thin steel wire bundles, so that good support and strength can be provided for the rope core of the steel wire rope; the secondary outer layer wires are formed by modified sisal hemp wires, and the sisal hemp fibers are tough in texture, wear-resistant, saline-alkali-resistant, corrosion-resistant, relatively high in self elasticity, strong in tensile force and good in oil storage capacity, and can be used in the steel wire rope core to increase the flexibility and effectively maintain the oil filling degree in the rope core. The sisal fiber is modified by utilizing graphene oxide and polyethyleneimine, so that a three-dimensional graphene oxide film formed by hydrogen bond acting force is formed on the outer surface of the sisal fiber, the tensile modulus of the sisal fiber can be greatly improved, the treated sisal fiber has a flat surface and few burrs, and the diameter of the sisal fiber can be effectively stabilized. The outer layer wire adopts modified sisal hemp wire and combination silk interval setting, and the combination silk adopts second steel wire and ultra high molecular weight polyethylene silk, further improves the intensity of wire rope core, and the supporting effect of second steel wire can effectively protect the inner structure of rope core, balances external pressure. The modified sisal hemp threads are arranged between the adjacent combined threads, and the combined use of the synthetic fibers and the natural fibers ensures the tensile property and improves the oil storage capacity of the rope core, so that the modified sisal hemp threads have good lubricating effect on the steel wire rope strands outside the rope core.

The invention also provides a preparation method of the high-strength steel wire rope core, the preparation process of the rope core is simple and easy to implement, the equipment requirement is low, the applicability is strong, and the produced steel wire rope core has excellent performance and wide development prospect.

Drawings

Fig. 1 is a schematic structural view of a high strength wire rope core of the present invention.

FIG. 2 is a graph comparing tensile modulus tests of sisal fibers of different treatments of the present invention.

In the figure: 1-center wire, 2-secondary outer layer wire, 3-outer layer wire, 4-second modified sisal hemp wire, 5-polyethylene woven protection layer, 201-first modified sisal hemp wire, 301-second steel wire and 302-ultra-high molecular weight polyethylene wire.

Detailed Description

The embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

As shown in fig. 1, the embodiment provides a high-strength steel wire rope core, which comprises a central wire 1, a primary outer wire 2 and an outer wire 3, wherein the central wire 1 is a steel wire bundle, and the steel wire bundle is formed by collecting 6-18 thin steel wire bundles; the secondary outer layer yarn 2 is spirally wrapped with the central yarn 1, and the secondary outer layer yarn 2 comprises 4-12 first modified sisal hemp yarns 201. The outer layer wires 3 are spirally wrapped and twisted with the secondary outer layer wires 2, the outer layer wires 3 comprise first combined wires and second modified sisal hemp wires 4, and the second modified sisal hemp wires 4 are arranged in gaps between adjacent first combined wires. The first combined yarn comprises a second steel yarn 301 and a plurality of ultra-high molecular weight polyethylene yarns 302, wherein the ultra-high molecular weight polyethylene yarns 302 helically wrap the second steel yarn 301. The diameter of the second modified sisal hemp thread 4 is 0.5-3 times of the diameter of the first modified sisal hemp thread 201. The diameter of the second steel wire 301 is 2-7 times of the diameter of the fine steel wire, and the second steel wire 301 and the fine steel wire are both subjected to phosphating coating treatment. And a polyethylene woven protection layer 5 is arranged outside the outer layer wire 3.

Wherein the first modified sisal hemp thread and the second modified sisal hemp thread are both graphene oxide-polyethyleneimine modified sisal hemp threads.

The graphene oxide-polyethyleneimine modified sisal hemp yarn is woven by a plurality of graphene oxide-polyethyleneimine modified sisal hemp fibers, and the modification step of the graphene oxide-polyethyleneimine modified sisal hemp fibers comprises the steps of alkali treatment, polyethyleneimine treatment and graphene oxide assembly. The surface of the sisal fiber contains a large number of light groups, and the sisal fiber has certain electronegativity after alkali treatment, becomes electropositive after cationic polyelectrolyte polyethyleneimine treatment, and can be coated with graphene oxide after electronegativity graphene oxide treatment. After the graphene oxide is coated on the surface of the sisal fiber, a certain hydrogen bond effect exists among the graphene oxide, the polyethyleneimine and the sisal fiber surface light base, so that a three-dimensional graphene oxide film formed by the hydrogen bond acting force is formed on the surface of the sisal fiber, and the mechanical property of the sisal fiber is improved.

The alkali treatment step is to soak a certain amount of sisal fibers in a 3% sodium hydroxide solution for 3-4 hours, then take out the sisal fibers, wash the sisal fibers to be neutral by pure water, and dry the sisal fibers at 70-75 ℃ to obtain the pretreated sisal fibers. The alkali treatment can remove a part of lignin, hemicellulose, pectin and other substances on the surface of the fiber, so that the activity space of the cellulose microfiber on the surface of the fiber is increased, and the cellulose microfiber is distributed and crystallized under the action of hydrogen bond force, thereby improving the tensile modulus of the sisal fiber.

The polyethyleneimine treatment step is that the pretreated sisal fibers are placed in a polyethyleneimine aqueous solution with the weight percentage of 4 percent for soaking for 2 hours, then the pretreated sisal fibers are taken out and washed for 4 to 5 times by pure water, and the second pretreated sisal fibers are obtained after drying at 80 ℃. The polyethyleneimine molecules contain-NH which can form hydrogen bonds with light groups on the surface of the fiber, and hydrogen bonds can also be formed between the polyethyleneimine molecules, so that a layer of film formed by the hydrogen bonds can be formed on the surface of the fiber, and the tensile modulus of the sisal fiber is further improved.

The graphene oxide assembly step comprises (1) immersing the second pretreated sisal fibers in a 3wt% polyethyleneimine aqueous solution for 1.5 hours, and then taking out the second pretreated sisal fibers and washing the second pretreated sisal fibers with pure water for 4-5 times; (2) Dissolving graphene oxide in deionized water to prepare a 5% graphene oxide solution, soaking the second pretreated sisal fibers in the step (1) in the graphene oxide solution for 2 hours, filtering the graphene oxide solution, and flushing the second pretreated sisal fibers with pure water for 4-5 times; (3) And (3) drying the second pretreated sisal fiber in the step (2) to constant weight at 80 ℃ to obtain the graphene oxide-polyethyleneimine modified sisal fiber. Because the graphene oxide also contains a large number of hydroxyl groups, and the graphene oxide can form more hydrogen bonds with polyethyleneimine molecules, the hydrogen bond density of the film on the surface of the sisal fiber is greatly enhanced. The graphene oxide and the polyethyleneimine are compounded for use, so that the firmness of a film on the surface of the sisal fiber can be effectively improved, the tensile modulus of the sisal fiber is improved, and the sisal fiber yarn with the preset diameter prepared from the modified sisal fiber is applied to a rope core of a steel wire rope, so that the high stretchability of the rope core can be improved, and the good oil storage lubricity can be achieved.

It should be noted that, in the steps (1) and (2) of assembling graphene oxide, the steps may be cycled 2-3 times, that is, the second pretreated sisal fiber is subjected to the steps (1) - (2) - (3) to obtain the graphene oxide-polyethyleneimine modified sisal fiber. The second pretreated sisal fiber can also be subjected to the steps (1) - (2) - (1) - (2) - (3) to prepare the graphene oxide-polyethyleneimine modified sisal fiber; the graphene oxide-polyethyleneimine modified sisal fiber can also be prepared by subjecting the second pretreated sisal fiber to the steps (1) - (2) - (1) - (2) - (1) - (2) - (3). By repeating the steps (1) and (2), a multi-layer film can be formed on the sisal fiber, the thickness of the film is increased, and the stress degree of the modified sisal fiber is improved.

The invention also provides a preparation method of the high-strength steel wire rope core, which is used for preparing the high-strength steel wire rope core and comprises the following steps of:

step 1, carrying out phosphating coating treatment on the fine steel wires and the second steel wires, and integrating a plurality of fine steel wire bundles into the central wire;

step 2, twisting the graphene oxide-polyethyleneimine modified sisal fibers into first modified sisal filaments and second modified sisal filaments with different diameters respectively, and simultaneously immersing the first modified sisal filaments and the second modified sisal filaments in oil;

step 3, helically wrapping and twisting the central yarn by the first modified sisal hemp yarn to obtain a secondary outer layer yarn, and spraying grease while twisting in the wrapping and twisting process;

step 4, taking a second steel wire and a plurality of ultra-high molecular weight polyethylene wires, and helically wrapping the ultra-high molecular weight polyethylene wires around the second steel wire by a strander to obtain the combined wire;

step 5, taking a plurality of combined filaments and a plurality of second modified sisal hemp filaments, arranging the combined filaments and the second modified sisal hemp filaments at intervals, and helically wrapping and twisting the combined filaments and the second modified sisal hemp filaments outside the secondary outer filaments by a strander to obtain the outer filaments;

step 6: taking polyethylene filaments as warp yarns and polyethylene pure spun staple yarns as weft yarns, winding and braiding the polyethylene filaments and the polyethylene pure spun staple yarns, and hot-pressing and compounding the polyethylene filaments and the polyethylene pure spun staple yarns outside the outer layer filaments to obtain the polyethylene braiding protective layer.

Example 2

The embodiment provides graphene oxide-polyethyleneimine modified sisal fiber, which is prepared by the following steps:

1. alkali treatment: soaking a certain amount of sisal fibers in a 3% sodium hydroxide solution for 3 hours, taking out the sisal fibers, washing the sisal fibers with pure water to be neutral, and drying the sisal fibers at 75 ℃ to obtain pretreated sisal fibers;

2. polyethyleneimine treatment: soaking the pretreated sisal fibers in a 4wt% polyethyleneimine aqueous solution for 2 hours, taking out the pretreated sisal fibers, washing the pretreated sisal fibers with pure water for 4 times, and drying the pretreated sisal fibers at 80 ℃ until the weight is constant to obtain second pretreated sisal fibers;

3. and (3) assembling graphene oxide: (1) Immersing the second pretreated sisal fibers in a 3wt% aqueous solution of polyethyleneimine for 1.5 hours, and then taking out the second pretreated sisal fibers and washing with pure water for 5 times; (2) Dissolving graphene oxide in deionized water to prepare a 5% graphene oxide solution, soaking the second pretreated sisal fibers in the step (1) in the graphene oxide solution for 2 hours, filtering the graphene oxide solution, and washing the second pretreated sisal fibers with pure water for 5 times; (3) And (3) drying the second pretreated sisal fiber in the step (2) to constant weight at 80 ℃ to obtain the graphene oxide-polyethyleneimine modified sisal fiber.

Comparative example 1

This comparative example provides a sisal fiber which is obtained by immersing it in 3% sodium hydroxide solution for 3 hours as compared with example 2, taking out the sisal fiber, washing it with pure water to neutrality, and drying it at 75 ℃.

Comparative example 2

This comparative example provides a sisal fiber obtained after alkali treatment and polyethyleneimine treatment compared to example 2.

The tensile properties of example 2, comparative example 1, comparative example 2 and sisal fibers without any treatment were tested, the tensile strength of individual fibers was tested according to GB-T14337-2088, thirty fibers of moderate thickness, smooth surface and uniform size were selected from each group of fibers for tensile testing, and the average value of the final results was calculated, the selected test rate being 2mm/min and the span being 20mm. The test results are shown in fig. 2. It can be seen that the graphite oxide-polyethylenimine treated sisal fibers have the highest tensile modulus, followed by polyethylenimine treated sisal fibers, followed by alkali treated sisal fibers, with untreated sisal fibers having the lowest tensile modulus. The alkali treatment can improve the tensile modulus of the sisal fiber, because the alkali treatment can remove a part of lignin, hemicellulose, pectin and other substances on the surface of the fiber, so that the activity space of the cellulose microfiber on the surface of the fiber is increased, and the cellulose microfiber is distributed and crystallized under the action of hydrogen bond force, thereby improving the tensile modulus of the sisal fiber. And after the polyethyleneimine treatment, the polyethyleneimine molecules contain-NH which can form hydrogen bonds with light groups on the surfaces of the fibers, so that the tensile modulus is further improved. The graphite oxide-polyethyleneimine treatment utilizes a large amount of hydroxyl groups in the graphene oxide to further construct more hydrogen bonds, so that the strength of the film on the surface of the sisal fiber is improved, and the strength of the sisal fiber is greatly improved.

According to the invention, the rope core comprising the composite structure of the central wire, the secondary outer wire and the outer wire is arranged, the central wire adopts a steel wire structure, so that the supporting force of the rope core is improved, the tensile capacity of the rope core can be improved, the outer wire adopts the modified sisal hemp, the modified sisal hemp consists of graphene oxide-polyethyleneimine modified sisal hemp fibers, and a film is formed on the surface of the sisal hemp fibers through alkali treatment, polyethyleneimine treatment and graphene oxide assembly, so that the tensile modulus of the sisal hemp fibers is greatly improved, the strength of the modified sisal hemp is improved, the integral strength of the rope core is further improved, meanwhile, the oil-containing effect of the sisal hemp fibers is outstanding, the oil storage performance of the steel wire rope core can be ensured, and the lubricating property of the steel wire rope strand is facilitated to be improved. The invention also provides a method for preparing the high-strength steel wire rope core, which is simple and easy to operate and has strong applicability.

The present invention has been described in detail with reference to the embodiments, and it should be noted that the specific features described in the above embodiments may be modified in combination by any suitable means without contradiction, and the present invention will not be described in any way. Further, other modifications and combinations of the features of the invention, as well as other variations and combinations of the features of the invention, are also contemplated as being within the scope of the invention.

Claims (9)

1. The utility model provides a high strength wire rope core, includes a center silk, once outer silk and an outer silk, its characterized in that: the central wire is a steel wire bundle, and the steel wire bundle is formed by collecting 6-18 thin steel wire bundles; the secondary outer layer yarn is spirally wrapped with the central yarn, and comprises 4-12 first modified sisal hemp yarns; the outer layer wires are spirally wrapped and twisted with the secondary outer layer wires, the outer layer wires comprise first combined wires and second modified sisal hemp wires, and the second modified sisal hemp wires are arranged in gaps between adjacent first combined wires; the first combined wire comprises a second steel wire and a plurality of ultra-high molecular weight polyethylene wires, and the ultra-high molecular weight polyethylene wires are spirally wrapped around the second steel wire;

wherein the first modified sisal hemp thread and the second modified sisal hemp thread are both graphene oxide-polyethyleneimine modified sisal hemp threads.

2. The high strength steel cord core according to claim 1, wherein: the graphene oxide-polyethyleneimine modified sisal hemp yarn is woven by a plurality of graphene oxide-polyethyleneimine modified sisal hemp fibers, and the modification step of the graphene oxide-polyethyleneimine modified sisal hemp fibers comprises the steps of alkali treatment, polyethyleneimine treatment and graphene oxide assembly.

3. The high strength steel cord core according to claim 2, wherein: the alkali treatment step is to soak a certain amount of sisal fibers in a 3% sodium hydroxide solution for 3-4 hours, then take out the sisal fibers, wash the sisal fibers to be neutral by pure water, and dry the sisal fibers at 70-75 ℃ to obtain the pretreated sisal fibers.

4. A high strength steel cord core according to claim 3, characterized in that: the polyethyleneimine treatment step is that the pretreated sisal fibers are placed in a polyethyleneimine aqueous solution with the weight percentage of 4 percent for soaking for 2 hours, then the pretreated sisal fibers are taken out and washed for 4 to 5 times by pure water, and the second pretreated sisal fibers are obtained after drying at 80 ℃.

5. The high strength steel wire rope core of claim 4, wherein the graphene oxide assembly step comprises: (1) Immersing the second pretreated sisal fibers in a 3wt% polyethyleneimine aqueous solution for 1.5 hours, and then taking out the second pretreated sisal fibers and washing the second pretreated sisal fibers with pure water for 4-5 times; (2) Dissolving graphene oxide in deionized water to prepare a 5% graphene oxide solution, soaking the second pretreated sisal fibers in the step (1) in the graphene oxide solution for 2 hours, filtering the graphene oxide solution, and flushing the second pretreated sisal fibers with pure water for 4-5 times; (3) And (3) drying the second pretreated sisal fiber in the step (2) to constant weight at 80 ℃ to obtain the graphene oxide-polyethyleneimine modified sisal fiber.

6. The high strength steel cord core according to claim 1, wherein: the diameter of the second modified sisal hemp thread is 0.5-3 times of that of the first modified sisal hemp thread.

7. The high strength steel cord core according to claim 1, wherein: the diameter of the second steel wire is 2-7 times of that of the fine steel wire, and the second steel wire and the fine steel wire are subjected to phosphating coating treatment.

8. The high strength steel cord core according to claim 1, wherein: and a polyethylene woven protective layer is arranged outside the outer layer wire.

9. A method for preparing a high strength steel wire rope core according to any one of claims 1 to 8, comprising the steps of:

step 1, carrying out phosphating coating treatment on the fine steel wires and the second steel wires, and integrating a plurality of fine steel wire bundles into the central wire;

step 2, twisting the graphene oxide-polyethyleneimine modified sisal fibers into first modified sisal filaments and second modified sisal filaments with different diameters respectively, and simultaneously immersing the first modified sisal filaments and the second modified sisal filaments in oil;

step 3, helically wrapping and twisting the central yarn by the first modified sisal hemp yarn to obtain a secondary outer layer yarn, and spraying grease while twisting in the wrapping and twisting process;

step 4, taking a second steel wire and a plurality of ultra-high molecular weight polyethylene wires, and helically wrapping the ultra-high molecular weight polyethylene wires around the second steel wire by a strander to obtain the combined wire;

step 5, taking a plurality of combined filaments and a plurality of second modified sisal hemp filaments, arranging the combined filaments and the second modified sisal hemp filaments at intervals, and helically wrapping and twisting the combined filaments and the second modified sisal hemp filaments outside the secondary outer filaments by a strander to obtain the outer filaments;

step 6: taking polyethylene filaments as warp yarns and polyethylene pure spun staple yarns as weft yarns, winding and braiding the polyethylene filaments and the polyethylene pure spun staple yarns, and hot-pressing and compounding the polyethylene filaments and the polyethylene pure spun staple yarns outside the outer layer filaments to obtain the polyethylene braiding protective layer.