An insulated power cable

Abstract

The present invention relates to the technical field of power cables, and proposes an insulated power cable, which comprises a cable core, an inner sheath layer, an armor layer, and an outer sheath layer from the inside to the outside, wherein the cable core is composed of a plurality of groups of cores arranged in bundles, the core is composed of a conductor and an insulating layer coated on the outside of the conductor, the conductor comprises one of copper wire or aluminum wire, and the outer sheath layer comprises the following raw materials in parts by weight: 70-80 parts of polyethylene, 15-20 parts of cross-linked polyethylene, 1-2 parts of antioxidant, 2-4 parts of anti-aging agent, 8-10 parts of plasticizer, 4-6 parts of lubricant, 20-30 parts of filler, 1-3 parts of silane coupling agent, and 15-20 parts of modified inorganic flame retardant; the modified inorganic flame retardant is obtained by modifying an inorganic flame retardant with acetamidobenzenesulfonamide. Through the above technical scheme, the problem of poor wear resistance and flame retardancy of insulated power cables in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to an insulated power cable. Background Art

[0002] Power cables are cable products used to transmit and distribute high-power electric energy in the trunk lines of power systems, including power cables of various voltage levels from 1 to 500KV and above. The proportion of power cables in power lines is gradually increasing, and its development has received widespread attention. Power cables play a vital role in power systems, but due to various reasons, power cables may fail, affecting the stable operation of power systems. One of the reasons is that when laying cables, strong pulling or friction with the ground may damage the cables, resulting in circuit short circuit failures, thereby causing fire accidents. Therefore, the preparation of an insulated power cable with good wear resistance and flame retardancy is an urgent problem to be solved. Summary of the invention

[0003] The invention provides an insulated power cable, which solves the problem of poor wear resistance and flame retardancy of the insulated power cable in the related art.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention provides an insulated power cable, which comprises a cable core, an inner sheath layer, an armor layer, and an outer sheath layer from the inside to the outside, wherein the cable core is composed of a plurality of groups of wire cores arranged in a bundle, the wire core is composed of a conductor and an insulating layer coated on the outside of the conductor, the conductor comprises one of a copper wire or an aluminum wire, and the outer sheath layer comprises the following raw materials in parts by weight: 70-80 parts of polyethylene, 15-20 parts of cross-linked polyethylene, 1-2 parts of antioxidant, 2-4 parts of anti-aging agent, 8-10 parts of plasticizer, 4-6 parts of lubricant, 20-30 parts of filler, 1-3 parts of silane coupling agent, and 15-20 parts of modified inorganic flame retardant;

[0006] The modified inorganic flame retardant is obtained by modifying an inorganic flame retardant with acetamidobenzenesulfonamide.

[0007] As a further technical solution, the added amount of the acetamidobenzenesulfonamide is 5% to 7% of the mass of the inorganic flame retardant.

[0008] In the present invention, the wear resistance and flame retardancy of the power cable are improved by adding an inorganic flame retardant modified by acetamidobenzenesulfonamide, and the wear resistance and flame retardancy of the power cable can be further improved by limiting the addition amount of acetamidobenzenesulfonamide to 5% to 7% of the mass of the inorganic flame retardant.

[0009] As a further technical solution, the added amount of the acetamidobenzenesulfonamide is 6% of the mass of the inorganic flame retardant.

[0010] As a further technical solution, the inorganic flame retardant includes one or more of calcium hydroxide, aluminum hydroxide, and magnesium hydroxide.

[0011] As a further technical solution, the preparation method of the modified inorganic flame retardant includes the following steps: adding the inorganic flame retardant and acetamidobenzenesulfonamide to N,N-dimethylformamide solution for modification, filtering and drying to obtain the modified inorganic flame retardant.

[0012] As a further technical solution, the modification temperature is 80-90° C., and the modification time is 1-2 hours.

[0013] As a further technical solution, the antioxidant includes one or more of antioxidant 1076, antioxidant 1010, and antioxidant DLTP.

[0014] As a further technical solution, the anti-aging agent includes one or more of anti-aging agent RD, anti-aging agent MB, and anti-aging agent 2246.

[0015] As a further technical solution, the plasticizer includes one or more of dioctyl phthalate, dioctyl adipate, and dioctyl sebacate.

[0016] As a further technical solution, the lubricant includes one or more of zinc stearate, paraffin wax, and polyethylene wax.

[0017] As a further technical solution, the filler includes one or more of white carbon black, calcium carbonate, and barium sulfate.

[0018] As a further technical solution, the silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-570, and silane coupling agent KH-590.

[0019] The present invention also provides a method for preparing an insulated power cable, comprising the following steps:

[0020] S1. Extruding the insulating material on the outside of the conductor to obtain the wire core;

[0021] S2, arranging a plurality of wire cores into bundles to form a cable core, and extruding an inner sheath material on the outer side of the cable core to obtain an inner sheath layer;

[0022] S3, wrapping an armor tape on the outer side of the inner sheath layer to obtain an armor layer, thereby obtaining a semi-finished power cable;

[0023] S4, melt-extrude the outer sheath layer raw material onto the outside of the semi-finished power cable to obtain an insulated power cable.

[0024] The working principle and beneficial effects of the present invention are:

[0025] In the present invention, the outer sheath layer of the power cable is based on polyethylene and cross-linked polyethylene, which improves the insulation of the power cable. By adding an inorganic flame retardant modified by acetamidobenzenesulfonamide, the flame retardancy and wear resistance of the power cable are improved. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the following examples and comparative examples:

[0028] Polyethylene, model 7042, purchased from Zibo Aole Plastics Co., Ltd.;

[0029] Cross-linked polyethylene, ZW01, was purchased from Luoyang Weiqiang Plastic Co., Ltd.

[0030] Example 1

[0031] A method for preparing an insulated power cable comprises the following steps:

[0032] S1. Extruding the insulating material on the outside of the conductor to obtain the wire core;

[0033] S2, arranging a plurality of wire cores into bundles to form a cable core, and extruding an inner sheath material on the outer side of the cable core to obtain an inner sheath layer;

[0034] S3, wrapping an armor tape on the outer side of the inner sheath layer to obtain an armor layer, thereby obtaining a semi-finished power cable;

[0035] S4. Mix 70 parts of polyethylene, 15 parts of cross-linked polyethylene, 1 part of antioxidant 1076, 2 parts of anti-aging agent RD, 8 parts of dioctyl phthalate, 4 parts of zinc stearate, 20 parts of white carbon black, 1 part of silane coupling agent KH-550 and 15 parts of modified inorganic flame retardant evenly, and melt-extrude them on the outside of the semi-finished power cable to obtain an insulated power cable.

[0036] The preparation method of the modified inorganic flame retardant is as follows: 50 g of aluminum hydroxide and 0.5 g of acetamidobenzenesulfonamide are added to 500 mL of N,N-dimethylformamide solution, heated and stirred at 80° C. for 2 h, filtered and dried to obtain the modified inorganic flame retardant.

[0037] Example 2

[0038] A method for preparing an insulated power cable comprises the following steps:

[0039] S1. Extruding the insulating material on the outside of the conductor to obtain the wire core;

[0040] S2, arranging a plurality of wire cores into bundles to form a cable core, and extruding an inner sheath material on the outer side of the cable core to obtain an inner sheath layer;

[0041] S3, wrapping an armor tape on the outer side of the inner sheath layer to obtain an armor layer, thereby obtaining a semi-finished power cable;

[0042] S4. Evenly mix 75 parts of polyethylene, 18 parts of cross-linked polyethylene, 1.5 parts of antioxidant 1010, 3 parts of anti-aging agent MB, 9 parts of dioctyl adipate, 5 parts of paraffin, 25 parts of calcium carbonate, 2 parts of silane coupling agent KH-570 and 18 parts of modified inorganic flame retardant, and melt-extrude them on the outside of the semi-finished power cable to obtain an insulated power cable.

[0043] The preparation method of the modified inorganic flame retardant is as follows: 50 g of calcium hydroxide and 0.5 g of acetamidobenzenesulfonamide are added to 500 mL of N,N-dimethylformamide solution, heated and stirred at 85° C. for 1.5 h, filtered and dried to obtain the modified inorganic flame retardant.

[0044] Example 3

[0045] A method for preparing an insulated power cable comprises the following steps:

[0046] S1. Extruding the insulating material on the outside of the conductor to obtain the wire core;

[0047] S2, arranging a plurality of wire cores into bundles to form a cable core, and extruding an inner sheath material on the outer side of the cable core to obtain an inner sheath layer;

[0048] S3, wrapping an armor tape on the outer side of the inner sheath layer to obtain an armor layer, thereby obtaining a semi-finished power cable;

[0049] S4. Evenly mix 80 parts of polyethylene, 20 parts of cross-linked polyethylene, 2 parts of antioxidant DLTP, 4 parts of anti-aging agent 2246, 10 parts of dioctyl sebacate, 6 parts of polyethylene wax, 30 parts of barium sulfate, 3 parts of silane coupling agent and 20 parts of modified inorganic flame retardant, and melt-extrude them on the outside of the semi-finished power cable to obtain an insulated power cable.

[0050] The preparation method of the modified inorganic flame retardant is as follows: 50 g of magnesium hydroxide and 0.5 g of acetamidobenzenesulfonamide are added to 500 mL of N,N-dimethylformamide solution, heated and stirred at 90° C. for 1 hour, filtered and dried to obtain the modified inorganic flame retardant.

[0051] Example 4

[0052] The present embodiment is compared with embodiment 1, and the difference is only that the addition amount of acetamidobenzenesulfonamide is 5g.

[0053] Example 5

[0054] The difference between this embodiment and embodiment 1 is that the addition amount of acetamidobenzenesulfonamide is 2.5g.

[0055] Example 6

[0056] The difference between this embodiment and embodiment 1 is that the addition amount of acetamidobenzenesulfonamide is 3g.

[0057] Example 7

[0058] The difference between this embodiment and embodiment 1 is that the addition amount of acetamidobenzenesulfonamide is 3.5g.

[0059] Comparative Example 1

[0060] A method for preparing an insulated power cable comprises the following steps:

[0061] S1. Extruding the insulating material on the outside of the conductor to obtain the wire core;

[0062] S2, arranging a plurality of wire cores into bundles to form a cable core, and extruding an inner sheath material on the outer side of the cable core to obtain an inner sheath layer;

[0063] S3, wrapping an armor tape on the outer side of the inner sheath layer to obtain an armor layer, thereby obtaining a semi-finished power cable;

[0064] S4. Mix 70 parts of polyethylene, 15 parts of cross-linked polyethylene, 1 part of antioxidant 1076, 2 parts of anti-aging agent RD, 8 parts of dioctyl phthalate, 4 parts of zinc stearate, 20 parts of white carbon black, 1 part of silane coupling agent KH-550 and 15 parts of aluminum hydroxide evenly, and melt-extrude them on the outside of the semi-finished power cable to obtain an insulated power cable.

[0065] The oxygen index of the outer sheath layer of the insulated power cable prepared in Examples 1 to 7 and Comparative Example 1 was measured using the measurement method in GB / T2406.2-2009 "Determination of Combustion Behavior of Plastics by Oxygen Index Method Part 2: Room Temperature Test", and the wear amount was tested using the measurement method in GB / T3960-2016 "Plastic Sliding Friction and Wear Test Method", and the test results are shown in Table 1.

[0066] Table 1 Performance test results of the outer sheath layer of the insulated power cables prepared in Examples 1 to 7 and Comparative Example 1

[0067]

[0068] Compared with Example 1, the inorganic filler in Comparative Example 1 was not modified. As a result, the oxygen index of the cable outer sheath layer prepared in Comparative Example 1 was lower than that in Example 1, and the wear amount was higher than that in Example 1, indicating that modifying the inorganic filler with acetamidobenzenesulfonamide can increase the oxygen index of the cable outer sheath layer and reduce the wear amount.

[0069] Compared with Example 1, Examples 4 to 7 changed the amount of acetamidobenzenesulfonamide added. As a result, the oxygen index of the cable outer sheath layer prepared in Examples 1 and 4 was lower than that in Examples 5 to 7, and the wear amount was higher than that in Examples 5 to 7, indicating that when the amount of acetamidobenzenesulfonamide added was 5% to 7% of the mass of the inorganic filler, the oxygen index of the cable outer sheath layer could be further improved and the wear amount could be reduced.

[0070] By comparing Examples 5 to 7, it is found that the oxygen index of the cable outer sheath layer prepared in Example 6 is higher than those in Examples 5 and 7, and the wear amount is lower than those in Examples 5 and 7, indicating that when the addition amount of acetamidobenzenesulfonamide is 6% of the mass of the inorganic filler, the oxygen index of the cable outer sheath layer prepared is the highest and the wear amount is the lowest.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An insulated power cable, which comprises, from inside to outside, a cable core, an inner sheath layer, an armor layer, and an outer sheath layer, wherein the cable core is composed of a plurality of groups of wire cores arranged in a bundle, the wire core is composed of a conductor and an insulating layer coated on the outside of the conductor, the conductor comprises one of a copper wire or an aluminum wire, and the outer sheath layer is characterized in that: The raw materials include the following components in parts by weight: 70-80 parts of polyethylene, 15-20 parts of cross-linked polyethylene, 1-2 parts of antioxidant, 2-4 parts of anti-aging agent, 8-10 parts of plasticizer, 4-6 parts of lubricant, 20-30 parts of filler, 1-3 parts of silane coupling agent, and 15-20 parts of modified inorganic flame retardant; The modified inorganic flame retardant is obtained by modifying an inorganic flame retardant with acetamidobenzenesulfonamide; The addition amount of the acetamidobenzenesulfonamide is 5% to 7% of the mass of the inorganic flame retardant; The inorganic flame retardant includes one or more of calcium hydroxide, aluminum hydroxide and magnesium hydroxide.

2. An insulated power cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1076, antioxidant 1010, and antioxidant DLTP.

3. An insulated power cable according to claim 1, characterized in that: The anti-aging agent includes one or more of anti-aging agent RD, anti-aging agent MB, and anti-aging agent 2246.

4. The insulated power cable according to claim 1, characterized in that: The plasticizer includes one or more of dioctyl phthalate, dioctyl adipate, and dioctyl sebacate.

5. The insulated power cable according to claim 1, characterized in that: The lubricant includes one or more of zinc stearate, paraffin wax and polyethylene wax.

6. The insulated power cable according to claim 1, characterized in that: The filler includes one or more of white carbon black, calcium carbonate and barium sulfate.

7. An insulated power cable according to claim 1, characterized in that: The silane coupling agent includes one or more of silane coupling agent KH-550, silane coupling agent KH-570, and silane coupling agent KH-590.

8. A method for preparing an insulated power cable according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Extruding the insulating material on the outside of the conductor to obtain the wire core; S2, arranging a plurality of wire cores into bundles to form a cable core, and extruding an inner sheath material on the outer side of the cable core to obtain an inner sheath layer; S3, wrapping an armor tape on the outer side of the inner sheath layer to obtain an armor layer, thereby obtaining a semi-finished power cable; S4, melt-extrude the outer sheath layer raw material onto the outside of the semi-finished power cable to obtain an insulated power cable.

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