Preparation process of molded line conductor filled with water-blocking glue

Abstract

The invention relates to a preparation process of a molded line conductor filled with water-blocking glue, which comprises the following steps of: performing layered stranding on conductor monofilaments to prepare the molded line conductor, and performing glue injection filling of the water-blocking glue for multiple times in the layered stranding process; wherein when a plurality of inner stranded layers are formed by stranding, first glue injection equipment is adopted to inject glue to the stranded parts of the conductor monofilaments, so that the water-blocking glue is stranded along with the conductor monofilaments, and the water-blocking glue is filled in a gap between two adjacent conductor monofilaments; and when a secondary outer layer twisting layer is formed by twisting, glue injection is performed on the conductor surface cross section of the conductor monofilament by adopting second glue injection equipment, and the outer surface of the secondary outer layer twisting layer is uniformly coated with the water-blocking glue. According to the preparation process of the molded line conductor filled with the water-blocking glue provided by the invention, different water-blocking glue filling modes are set for multiple stranded layers, so that the water-blocking performance of the conductor is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of preparing a profiled wire conductor, in particular to a preparation process of a profiled wire conductor filled with a water-blocking adhesive. Background Art

[0002] With the widespread application of high-voltage submarine cables in long-distance power transmission, island power transmission and large offshore wind farm construction, more and more cable companies have begun to produce XLPE insulated cables with higher voltage levels and longer lengths. However, traditional segmented conductors cannot meet the requirements of long-length continuous production. Therefore, most of them use shaped wire conductors for the design and production of large-section submarine cables.

[0003] The profiled wire conductor is a non-circular conductor whose cross-section can be rectangular, trapezoidal, fan-shaped, Z-shaped, or arch-shaped. Multiple profiled wire conductors are twisted together to form the conductors in the insulated cable. The current carrying capacity of cables with profiled wire-twisted compacted round copper conductors can be further improved compared to ordinary compacted twisted round copper conductor cables.

[0004] Large-section submarine cables are often laid in great water depths, so the requirements for the water-blocking performance of the conductor are becoming increasingly higher. Existing wire conductor water-blocking usually adds water-blocking tape or water-blocking powder as a water-blocking material when the monofilaments are twisted. However, with the increase in the water depth (above 1000m) of the submarine cable and the effect of metal ions in seawater, the expansion performance of the water-blocking powder will drop sharply, making the longitudinal water-blocking of the conductor a difficult point in the water-blocking of submarine cables.

[0005] In order to meet the water-blocking requirements of large-section water-blocking conductors of high-voltage submarine cables with water depths greater than 500m, existing water-blocking tapes are mostly used for longitudinal water-blocking of existing water-blocking conductors. However, as the cross-section of the water-blocking conductor increases, the gaps between the single wires in the water-blocking conductor become larger and larger, and the water-blocking effect of the water-blocking tape gradually deteriorates. When filling the water-blocking material, the water-blocking material needs to be twisted together with the single wires to completely fill the gaps between the conductor single wires. However, the existing process is not perfect, which easily leads to the penetration of water in the longitudinal direction, making it impossible to guarantee the water-blocking function of the water-blocking conductor when it is laid at a great depth. Summary of the invention

[0006] To this end, the technical problem to be solved by the present invention is to overcome the problem of poor water-blocking performance of the wire in the prior art, provide a preparation process of a wire conductor filled with water-blocking glue, and set different water-blocking glue filling methods for the multi-layer twisted layers, so as to further improve the water-blocking performance of the conductor.

[0007] In order to solve the above technical problems, the present invention provides a preparation process of a profiled wire conductor filled with a water-blocking adhesive, comprising the following steps:

[0008] The conductor monofilaments are layered and twisted to form a shaped wire conductor, and water-blocking glue is injected and filled multiple times during the layered twisting process;

[0009] Wherein: when twisting to form a multi-layer inner twisted layer, a first glue injection device is used to inject glue into the twisted part of the conductor monofilaments, so that the water-blocking glue is twisted in with the conductor monofilaments, and the water-blocking glue is filled in the gap between two adjacent conductor monofilaments;

[0010] When the secondary outer twisted layer is twisted, the second glue injection device is used to inject glue into the conductive surface section of the conductor monofilament, and the water-blocking glue is evenly coated on the outer surface of the secondary outer twisted layer.

[0011] In one embodiment of the present invention, when the profiled wire conductor includes multiple inner twisted layers, multiple first glue injection devices are provided according to the number of the inner twisted layers, and when each inner twisted layer is twisted, a first glue injection device is provided to inject glue into the twisted parts of the conductor monofilaments.

[0012] In one embodiment of the present invention, the first glue injection device and the second glue injection device are arranged on the same twisting wire to complete one-time multi-layer twisting and glue injection.

[0013] In one embodiment of the present invention, the first glue injection device and the second glue injection device are arranged behind the twisting cage of the twisted wire, the wire is released through the twisting cage, and the conductor monofilament is introduced into the glue injection mold. After the glue injection is completed in the glue injection mold, it is introduced into the glue injection molding machine to extrude and shape the water-blocking glue.

[0014] In one embodiment of the present invention, when filling the water-blocking glue, the first glue injection device is first started to stably discharge glue, and then the twisting device is started. After the conductor single wire is fed to the second glue injection device, the second glue injection device is started.

[0015] In one embodiment of the present invention, before the glue is injected, the glue is heated by the first glue injection device and the second glue injection device.

[0016] In one embodiment of the present invention, when using the first glue injection device to inject glue into the twisted part of the conductor monofilaments, it is monitored whether the water-blocking glue is twisted in with the conductor monofilaments. If the water-blocking glue is not twisted in with the conductor monofilaments, the temperature of the head of the first glue injection device is adjusted.

[0017] In one embodiment of the present invention, when using the first glue injection device and the second glue injection device, the air intake pressure of the first glue injection device and the second glue injection device is adjusted to 5±0.5 bar, and the air pressure of the glue injection head is adjusted to 3 bar.

[0018] In one embodiment of the present invention, the water-blocking adhesive is prepared by mixing a first component adhesive and a second component adhesive;

[0019] The first component glue includes: silicone modified epoxy resin, water-based fluorocarbon emulsion resin, silane waterproofing agent, coupling agent, auxiliary agent and water;

[0020] The second component glue comprises: silicate cement and filler;

[0021] Wherein: the mass ratio of the first component glue to the second component glue is 1:2.

[0022] In one embodiment of the present invention, the composition of the first component glue includes, by mass: 15 to 25 parts of silicone modified epoxy resin, 10 to 15 parts of water-based fluorocarbonic acid emulsion resin, 2 to 4 parts of silane waterproofing agent, 1 to 3 parts of coupling agent and 7 to 10 parts of auxiliary agent; the second component glue includes: 10 to 15 parts of silicate cement and 12 to 18 parts of filler.

[0023] The above technical solution of the present invention has the following advantages compared with the prior art:

[0024] The present invention discloses a preparation process of a profiled wire conductor filled with water-blocking adhesive, wherein different water-blocking adhesive filling methods are set for multiple twisted layers, and the water-blocking adhesive is filled while the conductor single wires are twisted;

[0025] When twisting to form a multi-layer inner twisted layer, a water-blocking adhesive is twisted in with the conductor monofilaments so that the water-blocking adhesive fills the gap between two adjacent conductor monofilaments. On the one hand, the gap between the conductor monofilaments can be blocked, and on the other hand, the water-blocking adhesive can be bonded to the conductor monofilaments, and the adhesive and the tape will not separate as the conductor monofilaments are bent, thereby improving the radial water-blocking effect of the profiled wire conductor;

[0026] When twisting to form the sub-outer twisted layer, glue is injected into the conductive surface section of the conductor monofilament so that the water-blocking glue is evenly coated on the outer surface of the sub-outer twisted layer. On the one hand, the twisted layer after the conductor monofilaments are twisted can be coated without exposing the twisted layer. On the other hand, the gaps between the conductor monofilaments can be further filled from the direction of the cross section to ensure that the water-blocking glue filled between the conductor monofilaments will not overflow and to ensure that no water-blocking glue overflows from the surface of the outermost conductor monofilaments after twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a schematic structural diagram of the profiled wire conductor of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the twisted wire for preparing the wire conductor of the present invention.

[0030] Explanation of the reference numerals in the specification: 1. Conductor monofilament; 2. Water-blocking glue; 100. First glue injection equipment; 200. Second glue injection equipment; 300. Stranding cage. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] The present invention discloses a preparation process of a water-blocking adhesive filled wire conductor. Figure 1 As shown, the profiled wire conductor is formed by twisting multiple layers of conductor monofilaments 1, and the conductor monofilaments 1 are spliced ​​end to end to form a ring structure to form a twisted layer. When preparing the multiple twisted layers, the multiple twisted layers are sequentially layered and coated on the profiled wire conductor, and multiple injections of water-blocking glue 2 are performed during the layered twisting process;

[0033] Wherein: when twisting to form a multi-layer inner twisted layer, a first glue injection device is used to inject glue into the twisted part of the conductor monofilaments 1, so that the water-blocking glue 2 is twisted in with the conductor monofilaments 1, and the water-blocking glue 2 is filled in the gap between two adjacent conductor monofilaments 1. This glue injection method is equivalent to a glue injection method along the axial direction of the conductor monofilaments 1. On the one hand, it can block the gap between the conductor monofilaments 1, and on the other hand, it ensures that the water-blocking glue 2 can be bonded to the conductor monofilaments 1, and the glue and the tape will not be separated as the conductor monofilaments 1 are bent, thereby improving the radial water-blocking effect of the profiled wire conductor;

[0034] When the second outer twisted layer is twisted, the second glue injection device 200 is used to inject glue into the conductive surface section of the conductor monofilament 1. The water-blocking glue 2 is coated on the outside of the conductor monofilament 1. This glue injection method is equivalent to a glue injection method along the radial direction of the conductor monofilament 1. On the one hand, the conductor monofilament 1 can be coated without exposing the conductor monofilament 1 to the outside. On the other hand, the gaps between the conductor monofilaments 1 are further filled from the direction of the cross section to ensure that the water-blocking glue 2 filled between the conductor monofilaments 1 will not overflow.

[0035] By combining the above two injection methods and using injection equipment with different injection effects according to the different twisted layer positions of the conductor monofilament 1, the injection effect can be improved, so that the profile conductor can be used in high-voltage submarine cables with large water depths and large cross-sections, meeting the requirements of high-voltage submarine cables for the water-blocking performance of the conductor.

[0036] Specifically, when the shaped wire conductor includes multiple inner twisted layers, multiple first glue injection devices 100 are set according to the number of inner twisted layers, and when each inner twisted layer twisting process is performed, a first glue injection device 100 is set to inject glue on the twisted parts of the conductor monofilament 1; for example: in this embodiment, the shaped wire conductor includes six twisted layers, and when preparing each of the first, second, third and fourth twisted layers, a first glue injection device 100 is set to inject glue on the twisted parts of the conductor monofilament 1, and when preparing the fifth twisted layer, a second glue injection device 100 is set to inject glue on the conductive surface section of the conductor monofilament 1.

[0037] Reference Figure 2 As shown, when preparing the wire conductor, the first glue injection device 100 and the second glue injection device 200 are set on the same twisted wire to complete a one-time multi-layer twisting and glue injection. When preparing, it can be completed through only one line defense and line collection, thereby improving the injection molding efficiency.

[0038] Specifically, the first glue injection device 100 and the second glue injection device 200 are respectively arranged behind the twisting cage 300 of the twisted wire, the wire is released through the twisting cage 300, and the conductor monofilament 1 is introduced into the glue injection mold. After the glue injection is completed in the glue injection mold, it is introduced into the glue injection molding machine to extrude and shape the water-blocking glue 2.

[0039] In this embodiment, since the first glue injection device 100 and the second glue injection device 200 have different injection forms, different mold sleeves are used to match the glue injection mold when setting the glue injection mold. For example, the glue injection mold in the first glue injection device 100 uses an integral mold to form the glue injection mold sleeve, and the glue injection mold in the second glue injection device 200 uses a half mold to form the glue injection mold sleeve.

[0040] Specifically, in actual production, in order to ensure the stability of the filling of the water-blocking glue 2, when filling the water-blocking glue 2, first start the first glue injection device 100 to make it stably discharge glue, and then start the twisting device. After the conductor single wire is fed to the second glue injection device, start the second glue injection device to avoid the water-blocking glue from accumulating at the mold outlet in advance, causing the water-blocking glue to overflow from the outermost layer of the wire conductor; at the same time, before using the first glue injection device 100 and the second glue injection device 200, it is necessary to ensure that there is sufficient glue remaining in the equipment to prevent glue from being broken during the filling process.

[0041] Specifically, in actual production, in order to make the water-blocking glue 2 have a certain fluidity, before injection, the glue is heated by the first injection equipment 100 and the second injection equipment 200. Generally, the temperature of the head in the injection equipment is set to about 135°C, and the temperature of the hose and the pressure plate in the injection equipment is set to about 140°C.

[0042] Specifically, in actual production, when using the first glue injection device 100 to inject glue into the twisted part of the conductor monofilament 1, monitor whether the water-blocking glue 2 is twisted in with the conductor monofilament 1. If the water-blocking glue 2 is not twisted in with the conductor monofilament 1, it indicates that the fluidity of the water-blocking glue 2 is too strong and it cannot adhere to the conductor monofilament 1. At this time, the temperature of the head of the first glue injection device 100 should be adjusted until the water-blocking glue 2 is twisted in with the conductor monofilament 1.

[0043] Specifically, in actual production, when using the first glue injection device 100 and the second glue injection device 200, the air intake pressure of the first glue injection device 100 and the second glue injection device 200 is adjusted to 5±0.5 bar, the air pressure of the glue injection head is adjusted to 3 bar, and the air intake pressure is adjusted to be greater than the extrusion pressure so that the glue can be extruded and coated.

[0044] The existing water-blocking glue 2 that can be used to fill the conductor can generally be divided into single-component glue and two-component glue. The single-component water-blocking glue 2 needs to be heated when filling the glue, and the heating of the conductor during the production of the cross-linked wire core will cause the glue to melt, and there is even a risk of the water-blocking glue 2 penetrating into the insulating layer from the conductor surface; while the two-component glue can be cured and cross-linked at room temperature, has good thermal stability, does not require heating when filling the glue, and is easy to operate. Its water-blocking principle is to use the good contact sealing between the water-blocking glue 2 itself and the conductor wire core to achieve the purpose of preventing moisture from flowing longitudinally in the conductor. Therefore, in this embodiment, the water-blocking glue 2 is prepared in the form of a two-component glue.

[0045] Specifically, the water-blocking adhesive 2 is prepared by mixing a first component adhesive and a second component adhesive, and the mass ratio of the first component adhesive to the second component adhesive is controlled to be 1:2.

[0046] Wherein: the first component glue includes: silicone modified epoxy resin, water-based fluorocarbon emulsion resin, silane waterproofing agent, coupling agent and auxiliary agent and water; wherein: the silicone modified epoxy resin can significantly improve the heat resistance, low temperature resistance and oxygen stability of epoxy resin, while retaining the original excellent properties of epoxy resin, such as high adhesion, low shrinkage and good stability, so that the water-blocking glue 2 has high adhesion and is not affected by temperature; the water-based fluorocarbon emulsion resin has good wettability and can improve the fluidity of the water-blocking glue 2; the silane waterproofing agent has excellent crack resistance and prevents the water-blocking glue 2 from breaking after curing;

[0047] The second component glue comprises: silicate cement and filler; the silicate cement is a gelling material that can bond the above-mentioned organosilicon-modified epoxy resin, water-based fluorocarbon emulsion resin and silane waterproofing agent together.

[0048] Furthermore, after multiple experimental verifications, the inventors provide an optimal ratio for mixing the first component adhesive and the second component adhesive:

[0049] The first component glue comprises, by weight, 15 to 25 parts of silicone-modified epoxy resin, 10 to 15 parts of water-based fluorocarbonic acid emulsion resin, 2 to 4 parts of silane waterproofing agent, 1 to 3 parts of coupling agent and 7 to 10 parts of auxiliary agent; the second component glue comprises 10 to 15 parts of silicate cement and 12 to 18 parts of filler;

[0050] The water-blocking adhesive 2 prepared using the above ratio has moderate viscosity and certain fluidity. It becomes a black elastomer after curing and can be completely bonded to the conductor monofilament 1. The adhesive and the tape will not separate as the conductor monofilament 1 bends. The combination of the adhesive and the tape is kept at 90°C for 24 hours without any oxidation corrosion to the conductor monofilament 1, and the water-blocking effect is good.

[0051] Specifically, in order to further verify the water-blocking performance of the conductor, a conductor water permeability test was carried out on the wire conductor of the present invention at a water depth of 600m. When the sample length was 10m, the water permeability depth was only 1.5m, which met the water-blocking standard of high-voltage submarine cables and can therefore be applied to the preparation of actual high-voltage submarine cables.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A process for preparing a wire conductor filled with a water-blocking adhesive, characterized in that: The following steps are involved: The conductor monofilaments are layered and twisted to form a shaped wire conductor, and water-blocking glue is injected and filled multiple times during the layered twisting process; Wherein: when twisting to form a multi-layer inner twisted layer, a first glue injection device is used to inject glue into the twisted part of the conductor monofilaments, so that the water-blocking glue is twisted in with the conductor monofilaments, and the water-blocking glue is filled in the gap between two adjacent conductor monofilaments; When the secondary outer twisted layer is twisted, the second glue injection device is used to inject glue into the conductive surface section of the conductor monofilament, and the water-blocking glue is evenly coated on the outer surface of the secondary outer twisted layer.

2. The process for preparing the water-blocking adhesive-filled wire conductor according to claim 1, characterized in that: When the profiled wire conductor includes multiple inner twisted layers, multiple first glue injection devices are provided according to the number of the inner twisted layers. When each inner twisted layer is twisted, a first glue injection device is provided to inject glue into the twisted parts of the conductor monofilaments.

3. The process for preparing the water-blocking adhesive filled wire conductor according to claim 1, characterized in that: The first glue injection device and the second glue injection device are arranged on the same twisting line to complete one-time multi-layer twisting and glue injection.

4. The process for preparing the water-blocking adhesive-filled wire conductor according to claim 1, characterized in that: The first glue injection device and the second glue injection device are arranged behind the twisting cage of the stranded wire, the wire is released through the twisting cage, and the conductor monofilament is introduced into the glue injection mold. After the glue injection is completed in the glue injection mold, it is introduced into the glue injection molding machine to extrude and shape the water-blocking glue.

5. The process for preparing the water-blocking adhesive filled wire conductor according to claim 1, characterized in that: When filling the water-blocking glue, first start the first glue injection device to make it stably discharge glue, then start the twisting device, and after the conductor single wire is fed to the second glue injection device, start the second glue injection device.

6. The process for preparing the water-blocking adhesive filled wire conductor according to claim 1, characterized in that: Before glue injection, the glue is heated by the first glue injection device and the second glue injection device.

7. The process for preparing the water-blocking adhesive filled wire conductor according to claim 1, characterized in that: When the first glue injection device is used to inject glue into the twisted part of the conductor monofilaments, it is monitored whether the water-blocking glue is twisted in with the conductor monofilaments. If the water-blocking glue is not twisted in with the conductor monofilaments, the temperature of the head of the first glue injection device is adjusted.

8. The process for preparing the water-blocking adhesive filled wire conductor according to claim 1, characterized in that: When using the first glue injection device and the second glue injection device, adjust the air inlet pressure of the first glue injection device and the second glue injection device to 5±0.5 bar, and adjust the air pressure of the glue injection machine head to 3 bar.

9. The process for preparing the water-blocking adhesive filled wire conductor according to claim 1, characterized in that: The water-blocking adhesive is prepared by mixing a first component adhesive and a second component adhesive; The first component glue includes: silicone modified epoxy resin, water-based fluorocarbon emulsion resin, silane waterproofing agent, coupling agent, auxiliary agent and water; The second component glue comprises: silicate cement and filler; Wherein: the mass ratio of the first component glue to the second component glue is 1:

2.

10. The process for preparing the water-blocking adhesive filled shaped wire conductor according to claim 9, characterized in that: In terms of parts by mass, the first component glue comprises: 15 to 25 parts of silicone-modified epoxy resin, 10 to 15 parts of water-based fluorocarbonic acid emulsion resin, 2 to 4 parts of silane waterproofing agent, 1 to 3 parts of coupling agent and 7 to 10 parts of auxiliary agent; the second component glue comprises: 10 to 15 parts of silicate cement and 12 to 18 parts of filler.

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