CN116005212A - A kind of steel cord, monofilament and its production method and production device - Google Patents

Abstract

The invention discloses a steel cord, a monofilament and a production method and a production device thereof, wherein the production method of the monofilament comprises the following steps: zinc plating is carried out on the surface of the brass steel wire, so that the brass steel wire with a zinc layer is obtained, and the gram weight of the zinc layer is 0.08-1 g/kg; washing, wet drawing and winding the brass steel wire with the zinc layer in sequence to obtain monofilaments; the production device of the monofilaments comprises a galvanizing tank, a rinsing tank, a wet drawing machine tool and a monofilament take-up pulley which are sequentially arranged. The invention maintains the zinc oxide on the surface of the monofilament at 0.05g/m after wet drawing by controlling the gram weight of the zinc layer ² ～0.2g/m ² Within the range, make a singleThe filaments and steel cords still have better aged adhesion retention without sacrificing initial adhesion.

Description

A kind of steel cord, monofilament and its production method and production device

technical field

The invention belongs to the technical field of steel cords, and in particular relates to a steel cord, a monofilament, a production method and a production device thereof.

Background technique

Brass steel cord has been widely used in various rubber products, brass coating as an intermediate can provide the adhesion between the cord and rubber, brass can establish a good initial bond with rubber, but as rubber products Especially in some high-humidity and high-heat special environments, the adhesion retention rate between the cord and rubber decreases, which accelerates the adhesion degradation of the two, resulting in a decrease in the durability of rubber products, that is, the aging adhesion between brass and rubber. Adhesion cannot be well maintained, this phenomenon has been widely reported, such as Guy S J.J.Adhesion Sci.Technol, 2005(6):445-465 or Guy B, Wang BX et al.Rubber World, 200:20-32, etc. . Therefore, without reducing the adhesion between the existing brass coating and rubber, how to reduce the degradation of aging adhesion is an effective means to prolong the life of rubber products such as tires.

Contents of the invention

The object of the present invention is to overcome the deficiencies in the prior art, provide a kind of steel cord, monofilament and its production method and production device, make monofilament and steel cord still have better under the condition of not sacrificing the initial adhesion force Excellent aging adhesion retention.

The present invention provides following technical scheme:

In a first aspect, a method for producing a monofilament is provided, comprising the following steps:

Galvanizing the surface of the brass steel wire to obtain a brass steel wire with a zinc layer, the grammage of the zinc layer is 0.08-1g/kg;

The brass steel wire with zinc layer is washed with water, wet drawn and taken up in sequence to obtain monofilament.

Further, after the brass steel wire with zinc layer is washed with water, it is washed with phosphoric acid, washed with water and taken up in sequence to obtain the steel wire after pickling;

The pickled steel wire is wet-drawn and taken up to obtain a monofilament.

Further, the diameter of the brass steel wire is 0.5-4.0 mm, the thickness of the brass coating on the surface of the brass steel wire is 0.4-2.5 μm, and the weight percentage of copper in the brass coating is 60-70%.

Further, the wire diameter compression ratio of the steel wire in the wet drawing step is >80%.

The second aspect provides a monofilament produced by the method described in the first aspect.

A third aspect provides a monofilament production device as described in the second aspect, comprising a galvanizing tank, a water washing tank, a wet drawing machine, and a monofilament take-up wheel arranged in sequence.

Further, the zinc sulfate bath is filled in the galvanizing tank, an anode frame is arranged in the galvanizing tank, and a cathode roll is arranged outside the galvanizing tank, and the anode frame and the cathode roll are respectively connected to the same power supply. Positive and negative poles;

The water washing tank includes one or more disconnected sub-tanks filled with pure water, and each sub-tank is provided with a first lift pump and a first water washing port connected to the first lift pump;

The lubricating fluid is filled in the wet drawing machine, and the wet drawing machine is provided with a circulation system, and the inlet end and the outlet end of the wet drawing machine are both provided with first wire passing guide wheels.

Further, it includes a galvanizing tank, a washing tank, a phosphoric acid tank, a re-washing tank, a steel wire take-up reel after pickling, a wet drawing machine and a monofilament take-up reel arranged in sequence.

Further, the phosphoric acid tank is filled with phosphoric acid liquid, and the phosphoric acid tank is divided into an upper tank body and a lower tank body by a partition, and a second lift pump is connected between the lower tank body and the upper tank body;

The rewash tank is provided with a third lift pump and a second water wash port connected to the third lift pump;

A second wire passing guide wheel is provided between the re-washing tank and the pickled steel wire take-up wheel.

In a fourth aspect, a steel cord is provided, which is obtained by twisting the monofilament described in the second aspect.

Compared with prior art, the beneficial effect of the present invention is:

(1) In the monofilament production method provided by the present invention, the surface of the brass steel wire is galvanized to obtain a brass steel wire with a zinc layer, and the brass steel wire with a zinc layer is sequentially washed and wet-drawn on the brass wire Zinc oxide is formed on the surface of the steel wire. By controlling the gram weight of the zinc layer to 0.08-1g/kg, the zinc oxide on the surface of the monofilament after wet drawing can be controlled within the range of 0.05g/m ² to 0.2g/m ² , so that the monofilament and The steel cord still has a better aging adhesion retention rate without sacrificing the initial adhesion, especially under the conditions of wet aging and heat aging, it can still maintain a good adhesion retention rate;

(2) Compared with the conventional brass monofilament, the monofilament of the present invention has an initial adhesion fluctuation range of only -2.5 to +3.3%, but its adhesion retention is higher than that of conventional brass monofilament after aging under special humid heat or steam conditions. Silk about 5 to 18%.

Description of drawings

Fig. 1 is a schematic structural view of a monofilament production device in Example 2 of the present invention;

Fig. 2 is a schematic structural view of a monofilament production device in Example 4 of the present invention;

The marks in the figure are: 1. Brass steel wire; 2. Cathode roller; 3. Galvanizing tank; 4. Anode rack; 5. Zinc sulfate plating solution; 6. The first lift pump; 7. The first water washing port; Washing tank; 9. Pure water; 10. Wet drawing machine; 11. Lubricating fluid; 12. Circulation system; 13. Monofilament with zinc oxide layer; 14. Monofilament take-up wheel; 15. First wire guide 16. Re-washing tank; 17. Steel wire after pickling; 18. Second wire guide wheel; 19. Steel wire take-up wheel after pickling; 20. Third lift pump; 21. Separator; 22. Phosphoric acid tank; 23, phosphoric acid solution; 24, the second lift pump; 25, the second water washing port.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer" and the like indicate orientations or positions The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and does not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

Example 1

This embodiment provides a production method of monofilament, the steps are as follows: galvanize the surface of the brass steel wire to obtain a brass steel wire with a zinc layer, and control the grammage of the zinc layer to be 0.08 to 1 g/kg; The zinc-coated brass steel wire is washed with water and wet-drawn in sequence. After wet-drawing, a layer of zinc oxide layer is formed on the surface of the steel wire. During the wet-drawing process, the wire diameter compression rate of the steel wire is >80%. Finally, the wire is drawn up to obtain a monofilament.

Wherein, the diameter of the brass steel wire is 0.5-4.0 mm, the thickness of the brass coating on the surface of the brass steel wire is 0.4-2.5 μm, the weight percentage of copper in the brass coating is 60-70%, and the brass coating can be Obtained in any way, such as electroplating, spraying or dipping.

In the traditional cord production, the brass coating on the surface of the brass steel wire is mainly α-phase brass, and the difference in the content ratio of copper and zinc in the brass makes it difficult to generate more than 0.05g/ ^m2 content on the surface during the drawing process. Zinc oxide layer. And when the zinc oxide content on the surface of the monofilament is greater than 0.2g/ ^m2 , it will cause excessively high zinc oxide on the surface of the monofilament and affect the initial adhesion between the monofilament and the rubber. In this embodiment, the gram weight of the zinc layer is controlled to be 0.08-1g/kg. During the wet drawing process, due to strong mechanical friction, most of the surface zinc layer will be removed, and the zinc will be partially oxidized to zinc oxide. The zinc oxide on the surface of the monofilament after wet drawing Finally, it is maintained within the range of 0.05g/m ² to 0.2g/m ² . The monofilaments after wet drawing can be twisted into cords of any structure, and can also be directly used as the final product, so that the monofilaments and cords still have better aging adhesion retention without sacrificing the initial adhesion , especially humidity and heat aging.

Example 2

As shown in Figure 1, this embodiment provides a monofilament production device for producing the monofilament in Example 1. The structure includes a galvanizing tank 3, a water washing tank 8, a wet drawing machine 10 and a monofilament Take-up wheel 14.

The galvanizing tank 3 is used for galvanizing the surface of the brass steel wire 1, which contains zinc sulfate plating solution 5, and the anode frame 4 is arranged in the galvanizing tank 3, and the cathode roller 2 and the anode frame 4 are arranged outside the galvanizing tank 3 Connect the positive pole and the negative pole of the same power supply with the cathode roller 2 respectively.

The washing tank 8 includes one or more disconnected sub-troughs, and pure water 9 is filled in the sub-troughs, and each sub-trough is provided with a first lifting pump 6 and a first washing port 7 connected with the first lifting pump 6, The first lift pump 6 can transport the pure water 9 in the sub-tank to the first water washing port 7 to wash the brass steel wire with zinc layer.

The lubricating fluid 11 is filled in the wet drawing machine 10 , the wet drawing machine 10 is provided with a circulation system 12 , and the inlet and outlet ends of the wet drawing machine 10 are provided with first wire passing guide wheels 15 . After washing, the brass steel wire with zinc layer enters the wet drawing machine 10 through the first wire passing guide wheel 15 at the inlet end of the wet drawing machine 10 to carry out the wet drawing process, and the monofilament 13 with the zinc oxide layer obtained after wet drawing The first wire passing guide wheel 15 at the outlet end is sent to the monofilament take-up wheel 14 for take-up.

In this embodiment, the brass steel wire with zinc layer is wet-drawn directly after washing, and the surface of the steel wire needs to be kept clean before wet-drawing. Therefore, the washing tank 8 is usually provided with a plurality of disconnected separate tanks for cleaning. This embodiment is suitable for small batch production of monofilaments.

Example 3

This embodiment provides a production method of monofilament, the steps are as follows: galvanize the surface of the brass steel wire to obtain a brass steel wire with a zinc layer, and control the grammage of the zinc layer to be 0.08 to 1 g/kg; The brass steel wire of the zinc layer is washed with water, phosphoric acid washed, washed with water and taken up in sequence to obtain the steel wire after pickling; the steel wire after pickling is wet-drawn and taken up to obtain a monofilament.

The difference between this example and Example 1 is that the brass steel wire with zinc layer is washed with water, then phosphoric acid washed, then washed with water and taken up. Phosphoric acid washes the surface of the steel wire to cover a layer of film to avoid the oxidation of the steel wire coating, so that the steel wire It can be stored for a certain number of days before wet drawing, without timely circulation, and multiple wires can be electroplated at the same time, which is suitable for large-scale production of single wires.

Example 4

As shown in Figure 2, the present embodiment provides a monofilament production device, which is used to produce the monofilament in Example 3. The structure includes a galvanizing tank 3, a washing tank 8, a phosphoric acid tank 22, and a water washing tank arranged in sequence. 16. Steel wire take-up reel after pickling. 19. Wet drawing machine and monofilament take-up reel.

The structures of the galvanizing tank 3, the wet drawing machine and the monofilament take-up wheel in this embodiment are all the same as those in Embodiment 2.

In the present embodiment, due to the brass steel wire with the zinc layer is washed with phosphoric acid after washing in the washing tank 8, the number of sub-grooves provided by the washing tank 8 can be less than that of the washing tank in embodiment 2, as shown in Figure 2 There is only 1 sub-slot.

Phosphoric acid liquid 23 is filled in the phosphoric acid tank 22, and the phosphoric acid tank 22 is separated into an upper tank body and a lower tank body by a partition 21, and a second lifting pump 24 is connected between the lower tank body and the upper tank body, and the second lifting pump 24 can The phosphoric acid solution 23 in the lower tank is transported to the upper tank for steel wire phosphoric acid washing to form a connection between the upper tank and the lower tank.

The rewash tank 16 is provided with a third lift pump 20 and a second water wash port 25 connected with the third lift pump 20, and the third lift pump 20 can deliver the pure water in the rewash tank 16 to the second water wash port 25. Clean up. The second wire passing guide wheel 18 is arranged between the water washing tank 16 and the steel wire take-up wheel 19 after pickling, which is used for the take-up of the steel wire 17 after pickling.

Example 5

A package of brass steel wire with a diameter of 0.50mm, a brass coating thickness of 0.4μm, and a copper content of 60.21% in the brass coating. kg of thin zinc-coated brass steel wire is drawn into a 0.175mm monofilament by wet drawing at a wire diameter compression rate of 87.75%, and then twisted into an A-structure cord. The coating parameters of the brass steel wire are shown in Table 1. Monofilament, curtain The coating parameters of the cord and the surface zinc oxide layer data are shown in Table 2, and the initial vulcanization and aging data of the A-structure cord are shown in Table 3.

Example 6

A package of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, and the copper content in the brass coating is 63.04%. After the steel wire is electro-galvanized and washed, it enters the wet drawing machine. g/kg, with a wire diameter compression ratio of 96.00%, it is wet-drawn into a 0.30mm monofilament, and then twisted into a B-structure cord. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the cord The surface zinc oxide layer data is shown in Table 2, and the initial vulcanization and aging data of the B-structure cord are shown in Table 3.

Example 7

A package of brass steel wire with a diameter of 2.20mm, a brass coating thickness of 2.0μm, and a copper content of 65.82% in the brass coating. After electro-galvanizing, water washing, phosphoric acid washing and re-washing, the wire is taken up, and the surface has a surface concentration of 0.48g/kg. The thin zinc-coated brass steel wire is drawn into a 0.38mm monofilament by wet drawing at a wire diameter compression rate of 97.02%, and then twisted into a C-structure cord. The coating parameters of the brass steel wire are shown in Table 1. Monofilament, cord The coating parameters and surface zinc oxide layer data are shown in Table 2, and the initial vulcanization and aging data of the C-structure cord are shown in Table 3.

Example 8

A pack of brass steel wire with a diameter of 3.14mm, the thickness of the brass coating is 2.2μm, and the copper content in the brass coating is 67.91%. g/kg, with a wire diameter compression rate of 97.66%, it is wet drawn into a 0.48mm monofilament, and the monofilament is directly used as a finished product. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the surface zinc oxide layer data are found in Table 2, and its vulcanization data are found in Table 3.

Example 9

A package of brass steel wire with a diameter of 4.00mm, the thickness of the brass coating is 2.5μm, and the copper content in the brass coating is 69.80%. g/kg, with 96.00% wire diameter compression rate, it is drawn into 0.8mm monofilament by wet drawing, and the monofilament is directly used as a finished product. The coating parameters of brass steel wire are shown in Table 1. The coating parameters of monofilament and the surface zinc oxide layer data are found in Table 2, and its vulcanization data are found in Table 3.

Example 10

A pack of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, and the copper content in the brass coating is 63.06%. g/kg, with a wire diameter compression ratio of 96.00%, it is wet-drawn into a 0.30mm monofilament, and then twisted into a B-structure cord. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the cord The surface zinc oxide layer data are shown in Table 2.

Example 11

A pack of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, and the copper content in the brass coating is 63.06%. g/kg, with a wire diameter compression ratio of 96.00%, it is wet-drawn into a 0.30mm monofilament, and then twisted into a B-structure cord. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the cord The surface zinc oxide layer data are shown in Table 2.

Example 12

A package of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, and the copper content in the brass coating is 63.06%. g/kg, with a wire diameter compression ratio of 96.00%, it is wet-drawn into a 0.30mm monofilament, and then twisted into a B-structure cord. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the cord The surface zinc oxide layer data are shown in Table 2.

Example 13

A pack of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, and the copper content in the brass coating is 63.06%. g/kg, with a wire diameter compression ratio of 96.00%, it is wet-drawn into a 0.30mm monofilament, and then twisted into a B-structure cord. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the cord The surface zinc oxide layer data are shown in Table 2.

Comparative example 1

A package of brass steel wire with a diameter of 0.50mm, the thickness of the brass coating is 0.4μm, and the copper content in the brass coating is 60.21%. It is directly drawn into a 0.175mm monofilament by wet drawing at a wire diameter compression rate of 87.75%, and then twisted It is A structure cord, and the coating parameters of brass steel wire are shown in Table 1. The coating parameters of monofilament and cord and the surface zinc oxide layer data are shown in Table 2. The initial vulcanization and aging data of A structure cord are shown in Table 3.

Comparative example 2

A pack of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, the copper content in the brass coating is 62.43%, and the wire diameter compression rate is 96.00%. For structure B cords, see Table 1 for coating parameters of brass steel wires, Table 2 for coating parameters and surface zinc oxide layer data for monofilaments and cords, and Table 3 for initial vulcanization and aging data for structure B cords.

Comparative example 3

A pack of brass steel wire with a diameter of 2.20mm, the thickness of the brass coating is 2.0μm, the copper content in the brass coating is 64.32%, and the wire diameter compression ratio is 97.02% After wet drawing, it is drawn into a 0.38mm monofilament, and then twisted into The coating parameters of the C structure cord and brass steel wire are shown in Table 1, the coating parameters of the monofilament and the cord and the surface zinc oxide layer data are shown in Table 2, and the initial vulcanization and aging data of the C structure cord are shown in Table 3.

Comparative example 4

A package of brass steel wire with a diameter of 3.14mm, the thickness of the brass coating is 2.2μm, and the copper content in the brass coating is 66.36%. As a finished product, the coating parameters of the brass steel wire are shown in Table 1, the coating parameters of the single wire and the surface zinc oxide layer data are shown in Table 2, and the vulcanization data are shown in Table 3.

Comparative example 5

A pack of brass steel wire with a diameter of 4.00mm, the thickness of the brass coating is 2.5μm, the copper content in the brass coating is 67.24%, and it is drawn into a 0.8mm monofilament by wet drawing at a wire diameter compression rate of 96.00%. The coating parameters of the finished product and brass steel wire are shown in Table 1, the coating parameters of the single wire and the surface zinc oxide layer data are shown in Table 2, and the vulcanization data are shown in Table 3.

Comparative example 6

A package of brass steel wire with a diameter of 1.52mm, the thickness of the brass coating is 1.5μm, and the copper content in the brass coating is 65.07%. g/kg, with a wire diameter compression ratio of 96.00%, it is wet-drawn into a 0.30mm monofilament, and then twisted into a B-structure cord. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the cord The surface zinc oxide layer data is shown in Table 2, and the initial vulcanization data of the B-structure cord is shown in Table 3.

Comparative example 7

A pack of brass steel wire with a diameter of 3.14mm, the thickness of the brass coating is 2.2μm, and the copper content in the brass coating is 69.24%. g/kg, with a wire diameter compression rate of 97.66%, it is wet drawn into a 0.48mm monofilament, and the monofilament is directly used as a finished product. The coating parameters of the brass steel wire are shown in Table 1. The coating parameters of the monofilament and the surface zinc oxide layer data are found in Table 2 with initial vulcanization data in Table 3.

The cords of the same specifications in the aforementioned Examples 5-13 and Comparative Examples 1-7 all adopt the same rubber material for initial vulcanization and aging, and the cords of A, B, and C specifications use rubber materials R1, R2, and R3 respectively. 8. The finished yarns of Comparative Example 4 and Comparative Example 7 used R4 sizing material, and the finished yarns of Example 9 and Comparative Example 5 used R5 sizing material. Among them, R1, R2, and R3 are rubber materials for steel wire products of the same type, and R4 and R5 are rubber materials for steel wire products of the same type.

Each embodiment of table 1 or comparative example brass steel wire coating parameter

Each embodiment of table 2 or comparative example monofilament, the coating parameter of cord and surface zinc oxide data

Table 3 Initial vulcanization and aging adhesion data of each embodiment or comparative example monofilament, cord

From the data in Table 2, it can be seen that in Examples 6, 10-13 and Comparative Example 2, as the amount of thin zinc coating on the brass steel wire increases, the zinc oxide content on the surface of the corresponding monofilament or cord increases, and the zinc oxide content on the surface of the monofilament increases. content increased from 0.022g/m ² to 0.179g/m ² , and the content of zinc oxide on the cord surface increased from 0.030g/m ² to 0.189g/m ² ; The zinc oxide content on the surface of the wire is more than 0.2g/m ² , and the copper content in the monofilament and cord coating drops significantly, and the rate of decline is more than 2%. The zinc oxide content on the surface of the corresponding monofilament and the cord is 0.220g/m ² and 0.228g/m ² respectively, and the copper content of the cord coating is 2.29% lower than that of the steel wire before drawing. Comparative Example 7 The brass steel wire is coated with thin zinc The layer weight is 1.20g/kg, which corresponds to a zinc oxide content of 0.235g/m ² on the surface of the monofilament, and the copper content of the monofilament is 2.80% lower than that of the steel wire coating before drawing.

Table 3 shows the initial vulcanization and aging adhesion data of monofilaments or cords in various examples or comparative examples, wherein the aging mainly includes wet and heat aging, which are 93°C/95%RH wet heat aging for 72h, 120% for 48h °C steam aging. From the data in Table 3, it can be seen that: after the thin zinc layer of ≤ 1g/kg is plated on the surface of the brass steel wire of Examples 5-9, the initial adhesion of the corresponding monofilament or cord is comparable to that of the brass steel wire of Comparative Examples 1-5. Compared with the initial adhesion, the fluctuation range is -2.5～+3.3%; the adhesion of steel wires decreases after special humid heat or steam aging conditions, and the reduction range of the brass steel wires with thin zinc layer in Examples 5 to 7 is 15% respectively. %, 15%, 10%, and 30%, 22%, 12%, the ranges of the brass steel wires in comparative examples 1 to 3 are 25%, 23%, 15%, and 36%, 27%, and 30%, respectively. It can be seen that there are Steel wires with a thin zinc layer of ≤1g/kg after drawing or twisting have similar initial adhesion to brass wires, but the wet and heat aging retention rates are about 5-18% higher.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (10)

1. a production method of monofilament, is characterized in that, comprises the following steps: Galvanizing the surface of the brass steel wire to obtain a brass steel wire with a zinc layer, the grammage of the zinc layer is 0.08-1g/kg; The brass steel wire with zinc layer is washed with water, wet drawn and taken up in sequence to obtain monofilament. 2. The production method of monofilament according to claim 1, characterized in that, after the brass steel wire with zinc layer is washed, phosphoric acid wash, rewash and take-up are carried out in sequence to obtain the steel wire after pickling; The pickled steel wire is wet-drawn and taken up to obtain a monofilament. 3. The production method of monofilament according to claim 1, characterized in that, the diameter of the brass steel wire is 0.5-4.0 mm, and the thickness of the brass coating on the surface of the brass steel wire is 0.4-2.5 μm, The weight percentage of copper in the brass coating is 60-70%. 4 . The production method of monofilament according to claim 1 , characterized in that, in the step of wet drawing, the wire diameter compression rate of the steel wire is >80%. 5. A monofilament, characterized in that it is produced by the method according to any one of claims 1-4. 6. A production device for monofilament according to claim 5, characterized in that it comprises a galvanizing tank, a washing tank, a wet drawing machine and a monofilament take-up wheel arranged in sequence. 7. The production device of monofilament according to claim 6, characterized in that, zinc sulfate plating solution is filled in the described galvanizing tank, an anode rack is arranged in the described galvanizing tank, and the peripheral equipment of the galvanizing tank There is a cathode roller, and the anode frame and the cathode roller are respectively connected to the positive pole and the negative pole of the same power supply; The water washing tank includes one or more disconnected sub-tanks filled with pure water, and each sub-tank is provided with a first lift pump and a first water washing port connected to the first lift pump; The lubricating fluid is filled in the wet drawing machine, and the wet drawing machine is provided with a circulation system, and the inlet end and the outlet end of the wet drawing machine are both provided with first wire passing guide wheels. 8. the production device of monofilament according to claim 6, is characterized in that, comprises the galvanizing tank that arranges successively, washing tank, phosphoric acid tank, rewashing tank, steel wire take-up wheel after pickling, wet drawing machine and Monofilament take-up reels. 9. The production device of monofilament according to claim 8, characterized in that, phosphoric acid liquid is filled in the phosphoric acid tank, and the phosphoric acid tank is divided into an upper tank body and a lower tank body by a partition, and the lower tank body A second lift pump is connected between the body and the upper tank; The rewash tank is provided with a third lift pump and a second water wash port connected to the third lift pump; A second wire passing guide wheel is provided between the re-washing tank and the pickled steel wire take-up wheel. 10. A steel cord, characterized in that it is obtained by twisting the monofilament according to claim 5.

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