Anti-aging medium and low voltage polyvinyl chloride cable and production method thereof

Abstract

The invention provides an anti-aging medium and low voltage polyvinyl chloride cable, which comprises an outer layer insulation skin, sealing rubber sleeves are glued on two sides of the outer layer insulation skin, a protection assembly is arranged on the inner wall of the outer layer insulation skin, the protection assembly comprises a separation rubber sheet, the separation rubber sheet is arranged on the inner wall of the outer layer insulation skin, and the separation rubber sheet is arranged on the inner wall of the outer layer insulation skin. A liquid bin is reserved between the two sets of separation films, the liquid bin is filled with a sodium silicate solution, a separation sleeve is arranged on the inner wall of the outer layer insulation skin, a liquid layer is embedded in the separation sleeve, and a repairing assembly is embedded in the liquid layer. When the outer insulating layer is damaged by external force, the isolation triggering protective layer is accurately broken to release aluminum oxide powder and a sodium silicate solution, the aluminum oxide powder and the sodium silicate solution are mixed and then rapidly react to generate a high-insulation and high-strength aluminosilicate hardened body, and sealing and leaking stoppage, structural reinforcement and flame retardance enhancement of a damaged part are synchronously achieved; and self-repairing can be completed without manual intervention.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof. Background Art

[0002] Medium and low voltage polyvinyl chloride cables are widely used in fields such as building power distribution, industrial control, and civil lighting due to advantages such as low cost, convenient processing, and chemical corrosion resistance. To improve the anti-aging performance of the cables, a migration-resistant plasticizer, a lead-free calcium-zinc composite stabilizer, and an ultraviolet absorber are usually added to the insulating material to inhibit the migration of the plasticizer and photo-oxidative aging; the PVC molecular chains are formed into a network structure through electron beam irradiation or chemical cross-linking process to enhance the heat resistance and mechanical strength; fillers such as carbon black and aluminum hydroxide are added to the sheath layer to improve the weather resistance and flame retardancy. These technologies have improved the service life and environmental adaptability of the cables to a certain extent and have become the mainstream production methods in the current industry.

[0003] In this regard, the patent document with the publication number CN119833236A discloses a self-repairing radio frequency coaxial cable, a leaky coaxial cable, and a manufacturing method thereof. On the basis of meeting the communication cable standards, this application further solves the technical problems of the deterioration of the electrical performance, the reduction of the reliability and the service life caused by the micro-damage of the foamed insulating layer during the use of the cable.

[0004] However, the existing cables lack self-repairing ability. When the outer insulating layer is severely damaged by external forces such as being hit or squeezed by sharp objects, moisture and corrosive gases are likely to directly invade the interior, resulting in conductor oxidation or insulating layer failure, and it relies on manual detection and replacement, unable to achieve real-time repair. The trigger sensitivity during damage leads to a decrease in the reliability of the cable and even safety accidents such as short circuits and fires. Therefore, a new cable technology that can automatically trigger repair when the insulating layer is severely damaged and has both structural reinforcement and flame retardant functions is needed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects existing in the prior art, and the present invention provides an anti-aging medium and low voltage polyvinyl chloride cable and a production method thereof.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: an anti-aging medium and low voltage polyvinyl chloride cable, including an outer insulating skin, and sealing rubber sleeves are glued on both sides of the outer insulating skin; a protection component is provided on the inner wall of the outer insulating skin, the protection component includes a partition film, a partition film is provided on the inner wall of the outer insulating skin, a liquid storage chamber is reserved between two groups of partition films, a sodium silicate solution is filled in the liquid storage chamber, a partition sleeve is provided on the inner wall of the outer insulating skin, a liquid layer is embedded in the partition sleeve, and a repair component is embedded in the liquid layer, the repair component includes a repair sleeve, partition grooves are provided on the surface of the repair sleeve, the partition grooves are arranged in a sheet structure and evenly distributed on the repair sleeve, alumina powder is filled between each group of partition grooves, a fitting surface is provided on the inner wall of the repair sleeve, a core layer sheath is arranged inside the fitting surface, a copper core is embedded in the core layer sheath, and heat dissipation holes are provided on the surface of the core layer sheath.

[0007] Further, the outer insulating skin, the liquid layer, the partition film and the partition sleeve are composed of the following components: 100 parts of polyvinyl chloride resin, 30-50 parts of polyester plasticizer, 3-5 parts of calcium-zinc composite stabilizer, 10-20 parts of activated alumina powder, 0.5-1 part of ultraviolet absorber, 0.2-0.4 part of antioxidant.

[0008] Further, the partition groove is composed of the following: 100 parts of polyvinyl chloride resin, 25-40 parts of epoxy soybean oil plasticizer, 2-4 parts of organotin stabilizer, 5-10 parts of carbon black filler, 15-25 parts of aluminum hydroxide flame retardant.

[0009] Further, the partition films are evenly distributed on the inner wall of the outer insulating skin, the partition sleeve is melt-connected to the inner wall of the partition film, and the outer insulating skin, the partition film and the partition sleeve are connected into an integral structure.

[0010] Further, a support sheet is embedded in the repair sleeve, a fitting surface is provided on the inner wall of the repair sleeve, and conduction grooves are provided on the surface of the fitting surface.

[0011] Further, the fitting surface is set as an arc surface, the conduction grooves are opened in the middle position of the fitting surface, and the gaps reserved between the conduction grooves and the partition grooves are communicated.

[0012] Further, a central core rod is arranged inside the repair, the central core rod is embedded inside three groups of core layer sheaths, and the central core rod is used to limit the position of the core layer sheath.

[0013] Further, the outer side of the central core rod abuts against the conduction grooves, the central core rod is in contact with three groups of conduction grooves at the same time, and the central core rod is used to support the three groups of repair sleeves.

[0014] Furthermore, the liquid layer is located between the partition sleeve and the repair sleeve. A thin film is provided on the surface of the liquid layer, and the thin film is a PET polyester film.

[0015] A production method of an anti-aging medium and low voltage polyvinyl chloride cable includes the following steps: S1: Anneal the copper core, control the annealing temperature at 200-300°C for 10-20 minutes. After removing the surface oxide layer, impregnate it with a silane coupling agent solution for 1-3 minutes and dry for standby; S2: Weigh 100 parts of polyvinyl chloride resin, 30-50 parts of polyester plasticizer, 3-5 parts of calcium-zinc composite stabilizer, 10-20 parts of activated alumina powder, 0.5-1 part of ultraviolet absorber, and 0.2-0.4 part of antioxidant by weight. First, premix the polyvinyl chloride resin and the polyester plasticizer in a high-speed mixer at 80-100°C for 15-20 minutes, then add the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continue mixing for 30-40 minutes to obtain the outer insulating skin, liquid layer, partition film, and partition sleeve; S3: Weigh 100 parts of polyvinyl chloride resin, 25-40 parts of epoxy soybean oil plasticizer, 2-4 parts of organotin stabilizer, 5-10 parts of carbon black filler, and 15-25 parts of aluminum hydroxide flame retardant by weight. Melt and blend them at 160-180°C using a twin-screw extruder and form a partition groove by injection molding. Melt-connect the outer insulating skin, partition film, and partition sleeve to form an integral structure; S4: Fill the inside of the partition groove with alumina powder and embed the filled alumina powder into the liquid layer; S5: Pass the pretreated conductor through an insulation extruder and a sheath extruder in sequence. Control the insulation layer extrusion temperature at 160-175°C and the sheath layer extrusion temperature at 170-185°C, and use a gradient cooling device for forming after extrusion; S6: Pass sodium silicate solution into the inside of the liquid storage through the liquid filling port, and seal the liquid filling port by gluing a sealant sleeve on the outer insulating skin after filling.

[0016] Compared with the prior art, the beneficial effects of the present invention include: when the outer insulating layer is damaged by external force, the isolation trigger protection layer accurately ruptures to release alumina powder and sodium silicate solution. After the two are mixed, they quickly react to form a highly insulating and high-strength aluminosilicate hardening body, synchronously realizing the sealing and plugging of the damaged part, structural reinforcement, and enhancement of flame retardant performance, and completing self-repair without manual intervention; the outer sheath enhanced protection layer uses a wear-resistant and weather-resistant material formula to resist ultraviolet rays, chemical corrosion, and mechanical impact. Combining with the stress dispersion effect of the inner layer sheet structure, it is applicable to multiple scenarios such as building power distribution, industrial control, and outdoor power transmission, significantly improving the safety and economy of power transmission. Description of the Drawings

[0017] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows a three-dimensional structural schematic diagram of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 2 Schematically shows a structural schematic diagram of the outer insulating skin and the sealing rubber sleeve of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 3 Schematically shows a structural schematic diagram of the liquid storage chamber and the partition film of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 4 Schematically shows a cross-sectional structural schematic diagram of the outer insulating skin of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 5 Schematically shows a structural schematic diagram of the repair sleeve and the bonding surface of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 6 Schematically shows a structural schematic diagram of the partition groove and the repair sleeve of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 7 Schematically shows a structural schematic diagram of the repair sleeve and the conduction groove of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 8 Schematically shows a first perspective exploded structural schematic diagram of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention; Figure 9 Schematically shows a second perspective exploded structural schematic diagram of an anti-aging medium and low voltage polyvinyl chloride cable and its production method according to an embodiment of the present invention.

[0018] In the figure: 11, outer insulating skin; 12, sealing rubber sleeve; 13, core layer sheath; 14, heat dissipation holes; 15, copper core; 2, protection component; 21, liquid storage chamber; 22, liquid layer; 23, partition film; 24, thin film sheet; 25, liquid filling port; 26, partition sleeve; 3, repair component; 31, repair sleeve; 32, partition groove; 33, support sheet; 34, bonding surface; 35, conduction groove; 36, central core rod. Detailed implementation manners

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, those of ordinary skill in the art can propose various interchangeable structural forms and implementation methods. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0020] Example 1: Combined with an embodiment of the present invention Figure 1 An anti-aging medium and low voltage polyvinyl chloride cable is composed of the following components: 100 parts of polyvinyl chloride resin, 30 parts of polyester plasticizer, 3 parts of calcium-zinc composite stabilizer, 10 parts of activated alumina powder, 0.5 part of ultraviolet absorber, 0.2 part of antioxidant; and 100 parts of polyvinyl chloride resin, 25 parts of epoxy soybean oil plasticizer filling port, 2 parts of organotin stabilizer, 5 parts of carbon black filler, 15 parts of aluminum hydroxide flame retardant copper core.

[0021] A production method of an anti-aging medium and low voltage polyvinyl chloride cable includes the following steps: S1: Anneal the copper core 15, control the annealing temperature at 200 °C for 10 min, remove the surface oxide layer, and then impregnate it with a silane coupling agent solution for 1 min and dry for standby; S2: Weigh 100 parts of polyvinyl chloride resin, 30 parts of polyester plasticizer, 3 parts of calcium-zinc composite stabilizer, 10 parts of activated alumina powder, 0.5 part of ultraviolet absorber, and 0.2 part of antioxidant by weight. First, premix the polyvinyl chloride resin and the polyester plasticizer in a high-speed mixer at 80 °C for 15 min, and then add the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continue mixing for 30 min to obtain the outer insulating skin 11, liquid layer 22, partition film 23, and partition sleeve 26; S3: Weigh 100 parts of polyvinyl chloride resin, 25 parts of epoxy soybean oil plasticizer, 2 parts of organotin stabilizer, 5 parts of carbon black filler, and 15 parts of aluminum hydroxide flame retardant by weight, melt and blend them at 160 °C using a twin-screw extruder, and form the partition groove 32 by injection molding. Melt-connect the outer insulating skin 11, partition film 23, and partition sleeve 26 to form an integral structure; S4: Fill the inside of the partition groove 32 with alumina powder, and embed the filled alumina powder into the inside of the liquid layer 22; S5: Pass the pretreated conductor through an insulation extruder and a sheath extruder in sequence, control the insulation layer extrusion temperature at 160 °C, control the sheath layer extrusion temperature at 170 °C, and form it using a gradient cooling device after extrusion; S6: Pass sodium silicate solution into the inside of the liquid storage 21 through the filling port 25, and seal the filling port 25 by gluing it to the outer insulating skin 11 with a sealant sleeve 12 after filling.

[0022] Example 2: Combined with an embodiment of the present invention Figure 1Shown. An anti-aging medium and low voltage PVC cable consists of the following components: 100 parts of PVC resin, 50 parts of polyester plasticizer, 5 parts of calcium-zinc composite stabilizer, 20 parts of activated alumina powder, 1 part of ultraviolet absorber, 0.4 part of antioxidant; and 100 parts of PVC resin, 40 parts of epoxy soybean oil plasticizer, 4 parts of organotin stabilizer, 10 parts of carbon black filler, 25 parts of aluminum hydroxide flame retardant.

[0023] A production method of an anti-aging medium and low voltage PVC cable includes the following steps: S1: Anneal the copper core 15, control the annealing temperature at 300 °C for 20 min. After removing the surface oxide layer, impregnate it with a silane coupling agent solution for 3 min and dry for standby; S2: Weigh 100 parts of PVC resin, 50 parts of polyester plasticizer, 5 parts of calcium-zinc composite stabilizer, 20 parts of activated alumina powder, 1 part of ultraviolet absorber, 0.4 part of antioxidant by weight. First, premix the PVC resin and polyester plasticizer in a high-speed mixer at 100 °C for 20 min, then add the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continue to mix for 40 min to obtain the outer insulating skin 11, liquid layer 22, partition film 23, and partition sleeve 26; S3: Weigh 100 parts of PVC resin, 40 parts of epoxy soybean oil plasticizer, 4 parts of organotin stabilizer, 10 parts of carbon black filler, 25 parts of aluminum hydroxide flame retardant by weight, melt and blend them at 180 °C using a twin-screw extruder, and form the partition groove 32 by injection molding. Melt-connect the outer insulating skin 11, partition film 23, and partition sleeve 26 to form an integral structure; S4: Fill the inside of the partition groove 32 with alumina powder and embed the filled alumina powder into the inside of the liquid layer 22; S5: Pass the pretreated conductor through an insulation extruder and a sheath extruder in sequence. Control the insulation layer extrusion temperature at 175 °C and the sheath layer extrusion temperature at 185 °C, and form it using a gradient cooling device after extrusion; S6: Pass sodium silicate solution into the inside of the liquid chamber 21 through the liquid filling port 25, and seal the liquid filling port 25 by gluing it on the outer insulating skin 11 with a sealing rubber sleeve 12 after filling.

[0024] Example 3: In combination with an embodiment of the present invention Figures 1-9Shown: An anti-aging medium and low voltage polyvinyl chloride cable, including an outer insulating skin 11, with sealing rubber sleeves 12 glued to both sides of the outer insulating skin 11. In the production and preparation of this cable, the innermost copper core 15 is protected by a multi-layer nested method. First, the outer insulating skin 11 is the outermost wrapping, which is the first wrapping. The partition sleeve 26 inside the outer insulating skin 11 conducts the second wrapping. Then, the liquid layer 22 conducts the third wrapping. The support piece 33 conducts the fourth wrapping. The core layer sheath 13 conducts the fifth wrapping. Through the five-layer wrapping inside and outside, the protection of the core layer sheath 13 is enhanced. The specific functions of each layer are as follows: A protection component 2 is provided on the inner wall of the outer insulating skin 11. The protection component 2 includes partition films 23. The partition films 23 are provided on the inner wall of the outer insulating skin 11. A liquid storage 21 is reserved between the two groups of partition films 23. The inside of the liquid storage 21 is filled with sodium silicate solution. The partition sleeve 26 is provided on the inner wall of the outer insulating skin 11. The partition films 23 are evenly distributed on the inner wall of the outer insulating skin 11. The partition sleeve 26 is melt-connected to the inner wall of the partition film 23. The outer insulating skin 11, the partition film 23, and the partition sleeve 26 are connected into an integral structure. When the outer insulating skin 11, the partition film 23, and the partition sleeve 26 are an integral structure, at this time, the liquid storage 21 is formed by the outer insulating skin 11, the partition film 23, and the partition sleeve 26. By injecting sodium silicate into the inside of the liquid storage 21 and filling the inside of the liquid storage 21, a separation is obtained between the outer insulating skin 11 and the partition sleeve 26. The function of the separation is that the heat on the outer insulating skin 11 is not easily transferred to the partition sleeve 26, and thus the heat transfer to the liquid layer 22 can also be inhibited; A liquid layer 22 is embedded inside the partition sleeve 26. The liquid layer 22 is between the partition sleeve 26 and the repair sleeve 31. A thin film piece 24 is provided on the surface of the liquid layer 22. The thin film piece 24 is a PET polyester film. When the inside of the partition groove 32 is filled with alumina powder, the alumina powder and the sodium silicate solution are separated by the thin film piece 24, the partition sleeve 26, and the liquid layer 22.

[0025] Through the above multi-layer design, the protection of the copper core 15 can be maximally enhanced to avoid breakage caused by damage to the copper core 15. First, the outer insulating sheath 11 provides the first layer of protection. During the daily use of the cable, the cable will come into contact with the ground or other objects. After contact, the movement of the cable will cause varying degrees of wear on the surface of the cable. The wrapping of the outer insulating sheath 11 can eliminate the impact of wear on the copper core 15. At the same time, the outer insulating sheath 11 also plays an important role in the strength of the entire cable. Secondly, the partition films 23 inside the outer insulating sheath 11 are evenly distributed inside the outer insulating sheath 11, and the liquid injection ports 25 penetrate each group of partition films 23, enabling communication between the liquid injection ports 25 and the liquid storage chambers 21. In this way, when sodium silicate solution is injected into the liquid injection ports 25 through pipes, the solution can well fill each group of liquid storage chambers 21. With the participation of the liquid, the efficiency of heat transfer can be reduced, and the sensitivity of the copper core 15 to the heat of the outer insulating sheath 11 can be decreased.

[0026] Based on these two layers, the protection of the copper core 15 can be further improved by establishing the repair component 3. The specific operation is as follows: The repair component 3 is embedded inside the liquid layer 22. The repair component 3 includes a repair sleeve 31. A support piece 33 is embedded inside the repair sleeve 31. The inner wall of the repair sleeve 31 is provided with a fitting surface 34. A conduction groove 35 is formed on the surface of the fitting surface 34. A partition groove 32 is formed on the surface of the repair sleeve 31. The partition groove 32 is arranged in a sheet-like structure and is evenly distributed on the repair sleeve 31. Alumina powder is filled between each group of partition grooves 32. The inner wall of the repair sleeve 31 is provided with a fitting surface 34. The fitting surface 34 is arranged as an arc surface. The conduction groove 35 is formed in the middle position of the fitting surface 34. The conduction groove 35 is communicated with the gap reserved between the partition grooves 32. A core layer sheath 13 is arranged inside the fitting surface 34. The copper core 15 is embedded inside the core layer sheath 13. Heat dissipation holes 14 are formed on the surface of the core layer sheath 13. A central core rod 36 is arranged inside the repair sleeve 31. The central core rod 36 is embedded inside the three core layer sheaths 13. The central core rod 36 is used to limit the position of the core layer sheath 13. The outer side of the central core rod 36 abuts against the conduction groove 35. The central core rod 36 is in contact with the three conduction grooves 35 at the same time. The central core rod 36 is used to support the three repair sleeves 31.

[0027] In the third layer of protection, protection is carried out through the liquid layer 22. The liquid layer 22 not only participates in the protection of the copper core 15, but also participates in the separation of the alumina powder and sodium silicate. By evenly filling the alumina powder between each separation groove 32 and covering the repair sleeve 31 with the liquid layer 22, it is ensured that the alumina powder is always between the repair sleeve 31 and the liquid layer 22. When the cable is scratched by a spike, the intrusion of foreign objects causes damage to the outer insulating skin 11. Usually, foreign objects cannot completely break through the isolation of the outer insulating skin 11. The intrusion of foreign objects will cause the surface of the outer insulating skin 11 to produce a concave deformation. When the outer insulating skin 11 has a concave deformation, the side opposite to the concave will protrude locally. Therefore, this state is defined as the intrusion of foreign objects. When the intrusion of foreign objects squeezes the separation sleeve 26, the separation sleeve 26 is recessed inward on one side, and then forces the thin film 24 on the liquid layer 22 to be recessed. When the thin film 24 is recessed, due to the relatively poor ductility of the thin film 24, the intrusion of foreign objects directly causes the thin film 24 to rupture. At this time, the sodium silicate solution inside the liquid chamber 21 will flow onto the repair sleeve 31 and react with the alumina powder inside the separation groove 32. As the reaction proceeds, the free silicate radicals in the solution combine with aluminum ions to form aluminosilicate gel or amorphous aluminosilicate. This product gradually hardens to form a solid, filling the damaged part of the cable, gradually hardening within 30 - 60 minutes at room temperature, blocking the damaged channel, and preventing water penetration. In this way, internal repair is achieved. At the same time, after hardening, it can provide relatively good support force and can prevent foreign objects from damaging the copper core 15 again.

[0028] In addition, due to the design of the sheet-like structure of the separation groove 32, during laying, it is convenient to adjust the angle. Secondly, it can disperse stress. When the outer insulating skin 11 is bent, the separation groove 32 produces elastic deformation. The setting of the separation groove 32 allows adjacent sheets to move relative to each other, avoiding the internal stress concentration caused by bending in a traditional solid insulating layer. Through the asymmetric distribution of the sheet-like structure, the cable can be preferentially bent in a specific direction. When the cable is impacted externally, the separation groove 32 absorbs energy through plastic deformation, reducing damage to the internal conductor and insulating layer.

[0029] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A medium and low voltage polyvinyl chloride cable with anti-aging property, characterized in that, It includes an outer insulating sheath, and sealing rubber sleeves are glued on both sides of the outer insulating sheath; a protective component is provided on the inner wall of the outer insulating sheath. The protective component includes a separating film. A separating film is provided on the inner wall of the outer insulating sheath. A liquid storage chamber is reserved between two groups of separating films. The liquid storage chamber is filled with sodium silicate solution. A separating sleeve is provided on the inner wall of the outer insulating sheath. A liquid layer is embedded in the separating sleeve. A repair component is embedded in the liquid layer. The repair component includes a repair sleeve. Separation grooves are formed on the surface of the repair sleeve. The separation grooves are arranged in a sheet-like structure and evenly distributed on the repair sleeve. Alumina powder is filled between each group of separation grooves. A fitting surface is formed on the inner wall of the repair sleeve. A core layer sheath is arranged inside the fitting surface. A copper core is embedded in the core layer sheath. Heat dissipation holes are formed on the surface of the core layer sheath.

2. The anti-aging medium and low voltage PVC cable according to claim 1, characterized in that, The outer insulating sheath, the liquid layer, the separating film and the separating sleeve are composed of the following components: 100 parts of polyvinyl chloride resin, 30 - 50 parts of polyester plasticizer, 3 - 5 parts of calcium-zinc composite stabilizer, 10 - 20 parts of activated alumina powder, 0.5 - 1 part of ultraviolet absorber, and 0.2 - 0.4 part of antioxidant.

3. The medium and low voltage polyvinyl chloride cable with anti-aging property as claimed in claim 1, characterized in that, The separation grooves are composed of the following components: 100 parts of polyvinyl chloride resin, 25 - 40 parts of epoxidized soybean oil plasticizer, 2 - 4 parts of organotin stabilizer, 5 - 10 parts of carbon black filler, and 15 - 25 parts of aluminum hydroxide flame retardant.

4. An anti-aging medium and low voltage PVC cable according to claim 1, characterized in that, The separating films are evenly distributed on the inner wall of the outer insulating sheath. The separating sleeve is melt-connected to the inner wall of the separating film. The outer insulating sheath, the separating film and the separating sleeve are connected into an integral structure.

5. The medium and low voltage polyvinyl chloride cable with anti-aging property according to claim 1, wherein A support sheet is embedded in the repair sleeve. A fitting surface is arranged on the inner wall of the repair sleeve. Conducting grooves are formed on the surface of the fitting surface.

6. The medium and low voltage polyvinyl chloride cable with anti-aging property according to claim 5, characterized in that, The fitting surface is an arc surface. The conducting grooves are formed in the middle position of the fitting surface. The gaps reserved between the conducting grooves and the separation grooves are communicated.

7. An anti-aging medium and low voltage PVC cable as claimed in claim 1, wherein, A central core rod is arranged inside the repair sleeve. The central core rod is embedded inside three groups of core layer sheaths. The central core rod is used to limit the positions of the core layer sheaths.

8. The anti-aging medium and low voltage polyvinyl chloride cable according to claim 7, characterized in that, The outer side of the central core rod abuts against the conducting grooves. The central core rod is simultaneously in contact with three groups of conducting grooves. The central core rod is used to support three groups of repair sleeves.

9. An anti-aging medium and low voltage polyvinyl chloride cable as claimed in claim 1, characterized in that, The liquid layer is located between the separating sleeve and the repair sleeve. A thin film sheet is arranged on the surface of the liquid layer. The thin film sheet is a PET polyester film.

10. The production method of an anti-aging medium and low voltage polyvinyl chloride cable as claimed in claim 9, characterized in that, It includes the following steps: S1: Anneal the copper core, control the annealing temperature at 200 - 300 °C for 10 - 20 min. After removing the surface oxide layer, impregnate it with a silane coupling agent solution for 1 - 3 min and dry for standby; S2: Weigh 100 parts of polyvinyl chloride resin, 30 - 50 parts of polyester plasticizer, 3 - 5 parts of calcium-zinc composite stabilizer, 10 - 20 parts of activated alumina powder, 0.5 - 1 part of ultraviolet absorber, and 0.2 - 0.4 part of antioxidant by weight. First, premix the polyvinyl chloride resin and polyester plasticizer in a high-speed mixer at 80 - 100 °C for 15 - 20 min, then add the calcium-zinc composite stabilizer, activated alumina powder, ultraviolet absorber, and antioxidant and continue mixing for 30 - 40 min to obtain the outer insulating skin, liquid layer, separating film, and separating sleeve; S3: Weigh 100 parts of polyvinyl chloride resin, 25 - 40 parts of epoxy soybean oil plasticizer, 2 - 4 parts of organotin stabilizer, 5 - 10 parts of carbon black filler, and 15 - 25 parts of aluminum hydroxide flame retardant by weight. Melt and blend them at 160 - 180 °C using a twin-screw extruder and form the separating groove by injection molding. Melt-connect the outer insulating skin, separating film, and separating sleeve to form an integral structure; S4: Fill the inside of the separating groove with alumina powder and embed the filled alumina powder into the inside of the liquid layer; S5: Pass the pretreated conductor through an insulation extruder and a sheath extruder in sequence. Control the insulation layer extrusion temperature at 160 - 175 °C and the sheath layer extrusion temperature at 170 - 185 °C, and form it using a gradient cooling device after extrusion; S6: Pass sodium silicate solution into the inside of the liquid chamber through the liquid filling port, and after filling, glue it to the outer insulating skin with a sealing rubber sleeve to seal the liquid filling port.

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