A cable full-structure recovery material and a preparation method thereof

Abstract

The application discloses a cable full-structure recovery material and a preparation method thereof, and relates to the technical field of cable materials. The conductor is welded first, then is immersed in a nano repairing liquid, then is coated with polyethylene mixture, the insulating layer is repaired, a semiconductive coating is coated on the insulating layer, a shielding layer is formed by winding the semiconductive coating after solidification, then a copper mesh belt is wound on the semiconductive belt and is welded with the semiconductive belt, then a waterproof belt is wound on the copper mesh belt, a double-layer steel belt is wound on the outer layer of the waterproof belt and is welded with the steel armor, and a heat-shrinking waterproof sleeve is used as the outermost layer to recover the outer sheath. The nano repairing liquid comprises the following raw materials in parts by weight: 20-35 parts of polysiloxane emulsion, 40-90 parts of solvent, 4-8 parts of methylsiloxane, 0.1-1 part of titanium-containing catalyst, 1-8 parts of emulsifier and 1-5 parts of modified vermiculite.

Description

Technical Field

[0001] The present invention relates to the technical field of cable restoration, and in particular to a cable full-structure restoration material and a preparation method thereof. Background Art

[0002] my country's urbanization and industrialization will continue to advance, leading to a surge in power cable investment in grid construction. Cable laying sites are often subject to complex and uncertain underground environments, and cable routing and orientation can change based on actual construction conditions. This can lead to discrepancies between planned and actual cable demand, insufficient lengths, or surpluses. While traditional materials and technologies, such as butt joints and fusion splices, can address the problem of fixed-point power cable splicing to some extent, they are limited by the associated processes and materials and cannot meet the physical requirements for tensile strength and bending resistance required for power cable installation.

[0003] As more and more short cables are left during the laying of power cables in power grid construction, there are several ways to deal with them:

[0004] (1) Returning inventory to wait for items that match the demand plan before being redeployed for use. The time is uncertain and the inventory cycle is long, which can easily lead to inventory backlogs and low inventory turnover rates.

[0005] (2) There is no matching project for long-term warehouse turnover, and the storage environment is uneven. There is a risk that the cables will be flooded and aged and can no longer be used. When the performance indicators of power cables are reduced, they can only be scrapped, resulting in waste.

[0006] Therefore, it is necessary to provide a method for fully restoring the structure of the cable so that it can be reused. Summary of the Invention

[0007] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a cable full-structure restoration material and a preparation method thereof.

[0008] The technical solutions of the present invention are as follows:

[0009] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0010] The nano repair solution includes the following raw materials in parts by weight:

[0011] 20-35 parts of polysiloxane emulsion, 40-90 parts of solvent, 4-8 parts of methylsiloxane, 0.1-1 part of titanium-containing catalyst, 1-8 parts of emulsifier, and 1-5 parts of modified vermiculite;

[0012] The preparation method of the modified vermiculite is as follows:

[0013] The vermiculite is added into a magnesium ion-containing aqueous solution for immersion, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 700-900°C.

[0014] As a preferred embodiment of the present invention, the solvent is at least one of xylitol, sorbitol, acetone, carbon tetrachloride, diethylene glycol and salicyl alcohol.

[0015] As a preferred embodiment of the present invention, the magnesium ion-containing aqueous solution includes at least one of a magnesium chloride aqueous solution, a magnesium sulfate aqueous solution and a magnesium nitrate aqueous solution.

[0016] As a preferred embodiment of the present invention, the concentration of the magnesium ion-containing aqueous solution is 1-3 g / L.

[0017] As a preferred embodiment of the present invention, the vegetable oil includes soybean oil and / or castor oil.

[0018] As a preferred embodiment of the present invention, the calcination time is 2-5 hours.

[0019] As a preferred embodiment of the present invention, the immersion time is 20-60 minutes.

[0020] As a preferred embodiment of the present invention, the titanium-containing catalyst includes at least one of isobutyl titanate, isopropyl dioleate acyloxy titanate, isopropyl dioctyl phosphate acyloxy titanate, and plant acid type monoalkoxy titanate.

[0021] As a preferred embodiment of the present invention, the emulsifier includes one of alkylphenol polyoxyethylene ether and nonionic fluorocarbon surfactant.

[0022] The present invention also discloses a cable full-structure restoration material, which is prepared by any of the above preparation methods.

[0023] The present invention has the following beneficial effects: It uses a specific repair fluid to eliminate moisture within the cable, preventing further degradation of the insulation caused by water treeing. Upon contact with water, the repair fluid forms a colloid that adheres to the inner surface of the cable insulation, repairing defects caused by water treeing to a certain extent. Its dielectric constant is close to that of the insulation layer. Furthermore, the addition of modified vermiculite to the repair fluid reduces the phenomenon of insulation de-bubbling caused by heating after prolonged use of the conductor. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in detail. The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this field or the product specifications are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be obtained commercially.

[0025] Example 1

[0026] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0027] The nano repair solution includes the following raw materials in parts by weight:

[0028] 20 parts of polysiloxane emulsion, 50 parts of solvent, 5 parts of methylsiloxane, 0.5 parts of titanium-containing catalyst, 3 parts of emulsifier, and 3 parts of modified vermiculite;

[0029] The preparation method of the modified vermiculite is as follows:

[0030] The vermiculite is immersed in a magnesium ion-containing aqueous solution, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 850°C.

[0031] The solvent is xylitol.

[0032] The magnesium ion-containing aqueous solution is a magnesium chloride aqueous solution.

[0033] The concentration of the magnesium ion-containing aqueous solution is 2 g / L.

[0034] The vegetable oil includes soybean oil.

[0035] The calcination time is 3 hours.

[0036] The immersion time is 40 minutes.

[0037] The titanium-containing catalyst includes isobutyl titanate.

[0038] The emulsifier includes alkylphenol polyoxyethylene ether.

[0039] Example 2

[0040] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0041] The nano repair solution includes the following raw materials in parts by weight:

[0042] 35 parts of polysiloxane emulsion, 60 parts of solvent, 7 parts of methylsiloxane, 0.6 parts of titanium-containing catalyst, 7 parts of emulsifier, and 3 parts of modified vermiculite;

[0043] The preparation method of the modified vermiculite is as follows:

[0044] The vermiculite is immersed in a magnesium ion-containing aqueous solution, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 850°C.

[0045] The solvent is sorbitol.

[0046] The magnesium ion-containing aqueous solution includes a magnesium chloride aqueous solution.

[0047] The concentration of the magnesium ion-containing aqueous solution is 2 g / L.

[0048] The vegetable oils include castor oil.

[0049] The calcination time is 3 hours.

[0050] The immersion time is 40 minutes.

[0051] The titanium-containing catalyst includes isobutyl titanate.

[0052] The emulsifier includes alkylphenol polyoxyethylene ether.

[0053] Example 3

[0054] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0055] The nano repair solution includes the following raw materials in parts by weight:

[0056] 35 parts of polysiloxane emulsion, 60 parts of solvent, 7 parts of methylsiloxane, 0.6 parts of titanium-containing catalyst, 7 parts of emulsifier, and 1 part of modified vermiculite;

[0057] The preparation method of the modified vermiculite is as follows:

[0058] The vermiculite is immersed in a magnesium ion-containing aqueous solution, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 850°C.

[0059] The solvent is sorbitol.

[0060] The magnesium ion-containing aqueous solution includes a magnesium chloride aqueous solution.

[0061] The concentration of the magnesium ion-containing aqueous solution is 2 g / L.

[0062] The vegetable oils include castor oil.

[0063] The calcination time is 3 hours.

[0064] The immersion time is 40 minutes.

[0065] The titanium-containing catalyst includes isobutyl titanate.

[0066] The emulsifier includes alkylphenol polyoxyethylene ether.

[0067] Example 4

[0068] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0069] The nano repair solution includes the following raw materials in parts by weight:

[0070] 35 parts of polysiloxane emulsion, 60 parts of solvent, 7 parts of methylsiloxane, 0.6 parts of titanium-containing catalyst, 7 parts of emulsifier, and 5 parts of modified vermiculite;

[0071] The preparation method of the modified vermiculite is as follows:

[0072] The vermiculite is immersed in a magnesium ion-containing aqueous solution, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 850°C.

[0073] The solvent is sorbitol.

[0074] The magnesium ion-containing aqueous solution includes a magnesium chloride aqueous solution.

[0075] The concentration of the magnesium ion-containing aqueous solution is 2 g / L.

[0076] The vegetable oils include castor oil.

[0077] The calcination time is 3 hours.

[0078] The immersion time is 40 minutes.

[0079] The titanium-containing catalyst includes isobutyl titanate.

[0080] The emulsifier includes alkylphenol polyoxyethylene ether.

[0081] Example 5

[0082] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0083] The nano repair solution includes the following raw materials in parts by weight:

[0084] 35 parts of polysiloxane emulsion, 60 parts of solvent, 7 parts of methylsiloxane, 0.6 parts of titanium-containing catalyst, 7 parts of emulsifier, and 3 parts of modified vermiculite;

[0085] The preparation method of the modified vermiculite is as follows:

[0086] The vermiculite is immersed in a magnesium ion-containing aqueous solution, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 850°C.

[0087] The solvent is sorbitol.

[0088] The magnesium ion-containing aqueous solution includes a magnesium chloride aqueous solution.

[0089] The concentration of the magnesium ion-containing aqueous solution is 3 g / L.

[0090] The vegetable oils include castor oil.

[0091] The calcination time is 3 hours.

[0092] The immersion time is 40 minutes.

[0093] The titanium-containing catalyst includes isobutyl titanate.

[0094] The emulsifier includes alkylphenol polyoxyethylene ether.

[0095] Comparative Example 1

[0096] A method for preparing a cable full-structure restoration material comprises welding the conductor, then immersing the conductor in a nano-repair solution, then coating the conductor with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer, and then wrapping the semi-conductive tape around the insulation layer after curing to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is then double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to its outer sheath using a heat-shrinkable waterproof tubing.

[0097] The nano repair solution includes the following raw materials in parts by weight:

[0098] 35 parts of polysiloxane emulsion, 60 parts of solvent, 7 parts of methylsiloxane, 0.6 parts of titanium-containing catalyst, and 7 parts of emulsifier;

[0099] The solvent is sorbitol.

[0100] The titanium-containing catalyst includes isobutyl titanate.

[0101] The emulsifier includes alkylphenol polyoxyethylene ether.

[0102] Comparative Example 2

[0103] A method for preparing a cable full-structure restoration material comprises welding the conductor, then coating it with a polyethylene mixture to repair the insulation layer, then applying a semi-conductive coating on the insulation layer. After curing, the semi-conductive tape is wrapped around the insulation layer to repair the shielding layer. A copper mesh tape is then wrapped around the semi-conductive tape and welded to the semi-conductive tape. A waterproof tape is then wrapped around the copper mesh tape. The outer layer of the waterproof tape is double-wrapped with steel tape and welded to the steel armor. The outermost layer is then restored to the outer sheath using a heat-shrinkable waterproof tubing.

[0104] The solvent is sorbitol.

[0105] The titanium-containing catalyst includes isobutyl titanate.

[0106] The emulsifier includes alkylphenol polyoxyethylene ether.

[0107] The performance of the above examples and comparative examples were tested, and the test results are shown in Table 1.

[0108] AC withstand voltage test: 39kV, no breakdown for 5min;

[0109] AC withstand voltage test: Power on at 39kV for 5 minutes to see if there is breakdown.

[0110] Impulse voltage test: 95-100℃, 95kV positive and negative polarity 10 times each, check whether it breaks down.

[0111] Waterproof experiment: constant voltage load cycle test in water (22kV, heating cycle at least 8h, 95℃~100℃ at least 2h, natural cooling at least 3h, total 30 times of thermal cycle).

[0112] Table 1 performance test results of examples and comparative examples

[0113]

[0114] At the same time, the maximum traction of the conductor of example 3 is 70N / mm 2 when the copper core cable is laid, and the maximum traction is 40N / mm 2 when the aluminum core cable is laid.

[0115] From the above, the performance of the examples is better than that of the comparative examples, the examples use a specific repair liquid to eliminate the moisture in the cable, prevent the further deterioration of the insulation by water trees, and the repair liquid generates a glue material after meeting water and adheres to the inner surface of the cable insulation, which repairs the defects caused by water tree erosion to a certain extent; and the dielectric constant is close to the dielectric constant of the insulation layer. In addition, the modified vermiculite is added to the repair liquid, which can reduce the phenomenon of insulation layer peeling caused by heating after long time use of the conductor, thereby providing the performance of the cable to a certain extent.

[0116] The above examples only express the preferred embodiments of the present application, which are described in detail and specifically, but should not be understood as the limitation of the patent scope of the present application. It should be noted that for ordinary skilled in the art, other various corresponding changes and deformations can be made according to the above described technical solutions and concepts, and all of these changes and deformations should belong to the protection scope of the claims of the present application.

Claims

1. A method for preparing a cable full structure restoration material, characterized in that: First, the conductor is welded, then immersed in the nano-repair liquid, and then coated with a polyethylene mixture to repair the insulation layer. A semi-conductive coating is then applied on the insulation layer. After curing, it is wrapped with a semi-conductive tape to repair and form a shielding layer. Then, a copper mesh tape is wrapped around the semi-conductive tape and welded to the semi-conductive tape. Then, a waterproof tape is wrapped around the copper mesh tape. The outer layer of the waterproof tape is double-wrapped with steel tape and welded to the steel armor. The outermost layer is restored to the outer sheath using a heat-shrinkable waterproof sleeve. The nano repair solution includes the following raw materials in parts by weight: 20-35 parts of polysiloxane emulsion, 40-90 parts of solvent, 4-8 parts of methylsiloxane, 0.1-1 part of titanium-containing catalyst, 1-8 parts of emulsifier, and 1-5 parts of modified vermiculite; The preparation method of the modified vermiculite is as follows: The vermiculite is added into a magnesium ion-containing aqueous solution for immersion, then taken out, and the surface of the vermiculite is sprayed with vegetable oil, and finally calcined at 700-900°C.

2. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The solvent is at least one of xylitol, sorbitol, acetone, carbon tetrachloride, diethylene glycol and salicyl alcohol.

3. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The magnesium ion-containing aqueous solution includes at least one of a magnesium chloride aqueous solution, a magnesium sulfate aqueous solution, and a magnesium nitrate aqueous solution.

4. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The concentration of the magnesium ion-containing aqueous solution is 1-3 g / L.

5. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The vegetable oils include soybean oil and / or castor oil.

6. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The calcination time is 2-5h.

7. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The immersion time is 20-60 minutes.

8. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The titanium-containing catalyst includes at least one of isobutyl titanate, isopropyl dioleyl acyloxy titanate, isopropyl dioctyl phosphate acyloxy titanate, and plant acid type monoalkoxy titanate.

9. The method for preparing a cable full-structure restoration material according to claim 1, characterized in that: The emulsifier includes one of alkylphenol polyoxyethylene ether and nonionic fluorocarbon surfactant.

10. A cable full structure restoration material, characterized in that: The method is prepared by any one of claims 1 to 9.

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