Cable full-structure recovery material and preparation method thereof

Abstract

The invention discloses a cable full-structure recovery material and a preparation method thereof, and relates to the technical field of cable materials.The cable full-structure recovery material is prepared by the steps that firstly, a conductor is welded and then soaked in nanometer repair liquid, then a polyethylene mixed material is coated, an insulating layer is repaired, the insulating layer continues to be coated with a semi-conductive coating, and after curing, a semi-conductive belt is lapped and repaired to form a shielding layer; then a copper mesh belt is wrapped on the semi-conductive belt and welded with the semi-conductive belt, then a waterproof belt is wrapped on the copper mesh belt, a steel belt is wound on the outer layer of the waterproof belt in a double-layer mode and welded with a steel armor, and a thermal shrinkage waterproof sleeve is used on the outermost layer to recover an outer sheath; the nano repair liquid comprises the following raw materials in parts by weight: 20-35 parts of polysiloxane emulsion, 40-90 parts of a solvent, 4-8 parts of methylsiloxane, 0.1-1 part of a titanium-containing catalyst, 1-8 parts of an 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, and the investment in power cables in power grid construction will surge. The underground environment is generally complex and uncertain at the cable laying construction site. The cable laying path and direction will be changed according to the actual construction conditions. Sometimes the planned cable demand will deviate from the actual demand, or the length will be insufficient, or there will be a surplus. Although the traditional intermediate joints, fusion joints and other materials and technologies can solve the problem of fixed-point power cable connection to a certain extent, they are restricted by related processes and materials and cannot meet the physical performance requirements of tensile strength and bending resistance of power cable laying.

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

[0004] (1) The inventory is returned to the warehouse and waits for the project that matches the demand plan to be redeployed. The time is uncertain and the inventory cycle is long, which easily leads to inventory backlog and low inventory turnover rate.

[0005] (2) There is no matching project for long-term warehouse turnover, the storage environment is uneven, and there is a risk that the cables will become water-logged 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 cable full structural restoration 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 solution of the present invention is as follows:

[0009] A method for preparing a cable full-structure restoration material, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 parts 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 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 700-900°C.

[0014] As a preferred embodiment of the present invention, the solvent is a medium solvent which 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 2-5h.

[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 dioleyl titanate, isopropyl dioctyl phosphate 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 invention also discloses a cable full-structure restoration material, which is prepared by any of the above preparation methods.

[0023] The beneficial effects of the present invention are as follows: the present invention uses a specific repair liquid to eliminate the moisture in the cable, preventing the water tree from further deteriorating the insulation. After the repair liquid meets water, it generates a glue substance that adheres to the inner surface of the cable insulation, repairing the defects caused by the water tree erosion to a certain extent; and its dielectric constant is close to that of the insulation layer. In addition, the present invention adds modified vermiculite to the repair liquid, which can reduce the phenomenon of heating and blistering of the insulation layer after the conductor is used for a long time. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0025] Example 1

[0026] A method for preparing a cable full-structure restoration material, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 3h.

[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, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 3h.

[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, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 3h.

[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, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 3h.

[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, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 3h.

[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, first welding the conductor, then immersing it in a nano-repairing liquid, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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, first welding the conductor, then coating it with a polyethylene mixture, repairing the insulation layer, and then coating the insulation layer with a semi-conductive coating, and then wrapping it with a semi-conductive tape to repair and form a shielding layer after curing, and then wrapping a copper mesh tape on the semi-conductive tape, and welding it to the semi-conductive tape, and then wrapping a waterproof tape on the copper mesh tape, and wrapping a double-layer steel tape around the outer layer of the waterproof tape and welding it to the steel armor, and using a heat-shrinkable waterproof casing on the outermost layer to restore the outer sheath;

[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 embodiments and comparative examples were tested, and the test results are shown in Table 1.

[0108] AC withstand voltage test: 39kv, 5min without breakdown;

[0109] AC withstand voltage test: Power on at 39kV for 5 minutes to see if it breaks down.

[0110] Impulse voltage test: 95-100℃, 95kv positive and negative polarity 10 times each, check for breakdown.

[0111] Waterproof test: Constant pressure load cycle test in water (22kV, heating cycle for at least 8h, 95℃~100℃ for at least 2h, natural cooling for at least 3h, a total of 30 thermal cycles).

[0112] Table 1 Performance test results of embodiments and comparative examples

[0113]

[0114]

[0115] At the same time, the maximum traction force when the conductor of Example 3 is a copper core cable is 70N / mm 2 , the maximum traction force when laying aluminum core cable is 40N / mm 2 .

[0116] As can be seen from the above, the performance of the embodiment is better than that of the comparative example. The embodiment uses a specific repair liquid to eliminate the moisture in the cable to prevent the water tree from further deteriorating the insulation. After the repair liquid meets water, it generates a glue substance that adheres to the inner surface of the cable insulation, which repairs the defects caused by water tree erosion to a certain extent; and its dielectric constant is close to that of the insulation layer. In addition, the present invention adds modified vermiculite to the repair liquid, which can reduce the phenomenon of heating and blistering of the insulation layer after long-term use of the conductor, thereby improving the performance of the cable to a certain extent.

[0117] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a cable full structure restoration material, characterized in that: First, weld the conductor, then immerse it in the nano repair liquid, then coat it with polyethylene mixture, repair the insulation layer, and then continue to apply semi-conductive coating on the insulation layer. After curing, wrap it with semi-conductive tape to repair and form a shielding layer. Then wrap the copper mesh tape on the semi-conductive tape and weld it with the semi-conductive tape. Then wrap the copper mesh tape with waterproof tape. The outer layer of the waterproof tape is double-wrapped with steel tape and welded to the steel armor. The outermost layer uses a heat-shrinkable waterproof casing to restore the outer sheath. 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 parts 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 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 700-900°C.

2. The method for preparing a cable full structure restoration material according to claim 1, characterized in that: The solvent is a medium solvent and 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 titanate, isopropyl dioctyl phosphate 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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