A soft wear-resistant cable and preparation method thereof

Abstract

The invention discloses a soft wear-resistant cable and a preparation method thereof, belonging to the technical field of cables. The cable comprises a copper core conductor and a flame retardant layer, wherein an insulating layer is sleeved on the copper core conductor, the insulating layer is located inside the flame retardant layer, a heat insulating layer is filled between the flame retardant layer and the insulating layer, and a wear-resistant layer is sleeved on the flame retardant layer, wherein the wear-resistant layer comprises the following raw materials in parts by weight: chlorinated polyethylene resin and ethylene propylene diene monomer rubber. The wear-resistant layer on the outside of the cable prepared by the invention not only has the characteristic of being soft, but also greatly improves the wear resistance of the cable, effectively increases the fire resistance temperature of the cable and prolongs the burning time, has good fire resistance and flame retardancy, and improves the functionality of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a soft and wear-resistant cable and a preparation method thereof. Background Art

[0002] At present, there are many types of mineral insulated cable products at home and abroad. However, for refineries, gas stations, oil gasification stations, terminals, subway stations, hospitals, new smart charging stations, coal mines, chemical industry, metallurgy, power plants, transmission and substations and other places with particularly high fire protection requirements and densely populated places, the demand for fire-resistant and high-temperature resistant mineral insulated cables is also increasing. At present, the softness and wear resistance of existing soft and wear-resistant cables at home and abroad are poor. During the wiring process of the cables, the cables are rubbed and the surface is easily damaged, causing safety accidents. At the same time, if a fire occurs, the existing soft and wear-resistant cables cannot meet the fire protection requirements, there are great safety hazards, and cannot meet the needs of timely escape of personnel and time for rescue. For this reason, we propose a soft and wear-resistant cable and a preparation method thereof. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a soft wear-resistant cable and a preparation method thereof, which overcomes the deficiencies in the prior art and aims to solve the problems in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a soft wear-resistant cable, comprising a copper core conductor and a flame retardant layer, wherein an insulating layer is sleeved on the copper core conductor, the insulating layer is located inside the flame retardant layer, a heat insulation layer is filled between the flame retardant layer and the insulating layer, and a wear-resistant layer is sleeved on the flame retardant layer;

[0005] The wear-resistant layer comprises the following raw materials in parts by weight: 50-60 parts of chlorinated polyethylene resin, 12-15 parts of EPDM rubber, 20-30 parts of acetylene black, 2-4 parts of oxidized polyethylene ester, 7-9 parts of tetrabromobisphenol, 2-5 parts of polycaprolactone polyol, 1-10 parts of silicon carbide, 1-5 parts of calcium stearate, and 3-7 parts of plasticizer;

[0006] The flame retardant layer comprises the following raw materials in parts by weight: 5-8 parts of artificial mica, 8-16 parts of magnesium chloride, 1-12 parts of potassium chloride, 6-15 parts of vinyl triethoxy silane, 7-11 parts of diethylene triamine, and 4-9 parts of heat stabilizer;

[0007] As a preferred technical solution of the present invention, the plasticizer is selected from one of DOS, DOP and DOA.

[0008] As a preferred technical solution of the present invention, the heat stabilizer is any one of a calcium zinc stabilizer, a rare earth calcium zinc stabilizer, and a composite lead salt stabilizer.

[0009] As a preferred technical solution of the present invention, the wear-resistant layer comprises the following raw materials in parts by weight: 52-58 parts of chlorinated polyethylene resin, 13-15 parts of ethylene propylene rubber, 20-27 parts of acetylene black, 3-4 parts of oxidized polyethylene ester, 7-8 parts of tetrabromobisphenol, 3-5 parts of polycaprolactone polyol, 3-9 parts of silicon carbide, 2-4 parts of calcium stearate, and 4-6 parts of plasticizer.

[0010] As a preferred technical solution of the present invention, the wear-resistant layer includes the following raw materials in parts by weight: 55 parts of chlorinated polyethylene resin, 13 parts of ethylene propylene rubber, 25 parts of acetylene black, 3 parts of oxidized polyethylene ester, 8 parts of tetrabromobisphenol, 4 parts of polycaprolactone polyol, 6 parts of silicon carbide, 3 parts of calcium stearate, and 5 parts of plasticizer.

[0011] As a preferred technical solution of the present invention, the flame retardant layer comprises the following raw materials in parts by weight: 6-8 parts of artificial mica, 7-15 parts of magnesium chloride, 3-9 parts of potassium chloride, 8-13 parts of vinyltriethoxysilane, 8-10 parts of diethylenetriamine, and 5-8 parts of thermal stabilizer.

[0012] As a preferred technical solution of the present invention, the flame retardant layer comprises the following raw materials in parts by weight: 7 parts of artificial mica, 12 parts of magnesium chloride, 7 parts of potassium chloride, 11 parts of vinyl triethoxy silane, 9 parts of diethylene triamine, and 7 parts of heat stabilizer;

[0013] The invention discloses a method for preparing a soft wear-resistant cable, comprising the following steps:

[0014] S1. Preparation of wear-resistant layer material: adding chlorinated polyethylene resin, EPDM rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol, and polycaprolactone polyol to a kneader and mixing for 30 minutes, then maintaining the reaction temperature at 75°C to mix the components evenly, then heating to 95°C and adding silicon carbide, calcium stearate, and plasticizer and mixing for 20-40 minutes, cooling, and feeding the discharged material into a twin-screw two-stage extruder for extrusion granulation to obtain a wear-resistant layer material;

[0015] S2, flame retardant layer material preparation: artificial mica, magnesium chloride, potassium chloride, vinyl triethoxysilane, and divinyl triamine are added into an extruder and mixed and extruded to obtain a flame retardant layer material;

[0016] S3, twisting and pressing a plurality of copper wires to form a single copper core conductor;

[0017] S4, wrap the insulation layer on the copper core conductor;

[0018] S5, twisting the copper core conductors wrapped with insulation layers into a cable core;

[0019] S6. Wrap the cable core with a flame retardant layer and fill it with a heat insulation layer, wherein the heat insulation layer is an inorganic refractory filling material;

[0020] S7, extruding the wear-resistant layer material around the sheath to form a wear-resistant layer.

[0021] As a preferred technical solution of the present invention, in step S1, the temperature of each zone of the screw is 125-135°C;

[0022] As a preferred technical solution of the present invention, in step S2, the extruder temperature is 80-120°C, and the blending time is 20-35 minutes.

[0023] Beneficial effects of the present invention:

[0024] The wear-resistant layer material is prepared by adding chlorinated polyethylene resin, EPDM rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol, and polycaprolactone polyol into a kneader for mixing, and then adding silicon carbide, calcium stearate, and a plasticizer for mixing, cooling, and sending the material into a twin-screw two-stage extruder for extrusion granulation to obtain a wear-resistant layer material for preparing the wear-resistant layer on the outside of the cable. The wear-resistant layer not only has the characteristics of softness, but also greatly improves the wear resistance of the cable.

[0025] The flame retardant layer of the cable is made by adding artificial mica, magnesium chloride, potassium chloride, vinyl triethoxysilane and divinyl triamine into an extruder for blending and extrusion to obtain a flame retardant layer material, which can fully protect the cable core of the cable when encountering a fire, effectively improve the fire resistance temperature of the cable and prolong the burning time, and can maintain normal and continuous power supply within a specified time at a specified flame temperature, which is conducive to fire fighting and rescue, reducing casualties and economic losses; and greatly improves the safety and comfort of the human living environment.

[0026] The present invention prepares the wear-resistant layer on the outside of the cable, which not only has the characteristic of being soft, but also greatly improves the wear resistance of the cable, effectively increases the fire resistance temperature of the cable and prolongs the burning time, has good fire resistance and flame retardant properties, and improves the functionality of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] In the figure: 1. wear-resistant layer; 2. flame-retardant layer; 3. heat-insulating layer; 4. copper core conductor; 5. insulating layer. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in 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.

[0030] Embodiment 1

[0031] Reference Figure 1 A soft wear-resistant cable and a preparation method thereof, comprising a copper core conductor 4 and a flame retardant layer 2, an insulating layer 5 is sleeved on the copper core conductor 4, the insulating layer 5 is located inside the flame retardant layer 2, a heat insulation layer 3 is filled between the flame retardant layer 2 and the insulating layer 5, and a wear-resistant layer 1 is sleeved on the flame retardant layer 2;

[0032] The wear-resistant layer 1 comprises the following raw materials in parts by weight: 50 parts of chlorinated polyethylene resin, 12 parts of EPDM rubber, 20 parts of acetylene black, 2 parts of oxidized polyethylene ester, 7 parts of tetrabromobisphenol, 2 parts of polycaprolactone polyol, 1 part of silicon carbide, 1 part of calcium stearate, and 3 parts of plasticizer, wherein the plasticizer is DOS;

[0033] The flame retardant layer 2 comprises the following raw materials in parts by weight: 5 parts of artificial mica, 8 parts of magnesium chloride, 1 part of potassium chloride, 6 parts of vinyl triethoxysilane, 7 parts of diethylenetriamine, and 4 parts of a heat stabilizer, wherein the heat stabilizer is a calcium zinc stabilizer;

[0034] The preparation method of the above soft wear-resistant cable comprises the following steps:

[0035] S1, preparation of wear-resistant layer 1 material: add chlorinated polyethylene resin, EPDM rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol, polycaprolactone polyol into a kneader and mix for 30 minutes, then keep the reaction temperature at 75°C to mix the components evenly, then heat to 95°C and add silicon carbide, calcium stearate, and plasticizer and mix for 20 minutes, cool, and send the material into a twin-screw two-stage extruder for extrusion granulation, the temperature of each zone of the screw is 125°C, to obtain the wear-resistant layer material;

[0036] S2, preparation of flame retardant layer 2 material: artificial mica, magnesium chloride, potassium chloride, vinyl triethoxysilane and divinyl triamine are added into an extruder for blending and extrusion. The extruder temperature is 80° C. and the blending time is 20 min to obtain a flame retardant layer material;

[0037] S3, twisting and pressing a plurality of copper wires to form a single copper core conductor 4;

[0038] S4, wrapping the insulating layer 5 on the copper core conductor 4;

[0039] S5, twisting the copper core conductor 4 wrapped with the insulating layer 5 into a cable core;

[0040] S6, wrap the cable core with a flame retardant layer and fill it with a heat insulation layer 3, where the heat insulation layer 3 is an inorganic refractory filling material;

[0041] S7, extruding the wear-resistant layer material into a sheath to form a wear-resistant layer 1, and obtaining a soft wear-resistant cable.

[0042] Embodiment 2

[0043] Reference Figure 1 A soft wear-resistant cable and a preparation method thereof, comprising a copper core conductor 4 and a flame retardant layer 2, an insulating layer 5 is sleeved on the copper core conductor 4, the insulating layer 5 is located inside the flame retardant layer 2, a heat insulation layer 3 is filled between the flame retardant layer 2 and the insulating layer 5, and a wear-resistant layer 1 is sleeved on the flame retardant layer 2;

[0044] The wear-resistant layer 1 comprises the following raw materials in parts by weight: 55 parts of chlorinated polyethylene resin, 14 parts of EPDM rubber, 25 parts of acetylene black, 3 parts of oxidized polyethylene ester, 8 parts of tetrabromobisphenol, 4 parts of polycaprolactone polyol, 6 parts of silicon carbide, 3 parts of calcium stearate, and 5 parts of plasticizer, wherein the plasticizer is DOP;

[0045] The flame retardant layer 2 comprises the following raw materials in parts by weight: 7 parts of artificial mica, 12 parts of magnesium chloride, 7 parts of potassium chloride, 11 parts of vinyl triethoxysilane, 9 parts of diethylene triamine, and 7 parts of a heat stabilizer, wherein the heat stabilizer is a rare earth calcium zinc stabilizer;

[0046] The preparation method of the above soft wear-resistant cable comprises the following steps:

[0047] S1, preparation of wear-resistant layer 1 material: add chlorinated polyethylene resin, EPDM rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol, polycaprolactone polyol into a kneader and mix for 30 minutes, then keep the reaction temperature at 75°C to mix the components evenly, then heat to 95°C and add silicon carbide, calcium stearate, and plasticizer and mix for 30 minutes, cool, and send the material into a twin-screw two-stage extruder for extrusion granulation, the temperature of each zone of the screw is 130°C, to obtain the wear-resistant layer material;

[0048] S2, preparation of flame retardant layer 2 material: 7 parts of artificial mica, 12 parts of magnesium chloride, 7 parts of potassium chloride, 11 parts of vinyl triethoxysilane, and 9 parts of diethylenetriamine were added into an extruder for blending and extrusion. The extruder temperature was 100° C. and the blending time was 27 min to obtain a flame retardant layer material;

[0049] S3, twisting and pressing a plurality of copper wires to form a single copper core conductor 4;

[0050] S4, wrapping the insulating layer 5 on the copper core conductor 4;

[0051] S5, twisting the copper core conductor 4 wrapped with the insulating layer 5 into a cable core;

[0052] S6, wrap the cable core with a flame retardant layer and fill it with a heat insulation layer 3, where the heat insulation layer 3 is an inorganic refractory filling material;

[0053] S7, extruding the wear-resistant layer material into a sheath to form a wear-resistant layer 1, and obtaining a soft wear-resistant cable.

[0054] Embodiment 3

[0055] Reference Figure 1 A soft wear-resistant cable and a preparation method thereof, comprising a copper core conductor 4 and a flame retardant layer 2, an insulating layer 5 is sleeved on the copper core conductor 4, the insulating layer 5 is located inside the flame retardant layer 2, a heat insulation layer 3 is filled between the flame retardant layer 2 and the insulating layer 5, and a wear-resistant layer 1 is sleeved on the flame retardant layer 2;

[0056] The wear-resistant layer 1 comprises the following raw materials in parts by weight: 60 parts of chlorinated polyethylene resin, 15 parts of EPDM rubber, 30 parts of acetylene black, 4 parts of oxidized polyethylene ester, 9 parts of tetrabromobisphenol, 5 parts of polycaprolactone polyol, 10 parts of silicon carbide, 5 parts of calcium stearate, and 7 parts of plasticizer, wherein the plasticizer is DOA;

[0057] The flame retardant layer 2 comprises the following raw materials in parts by weight: 8 parts of artificial mica, 16 parts of magnesium chloride, 12 parts of potassium chloride, 15 parts of vinyl triethoxy silane, 11 parts of diethylene triamine, and 9 parts of a heat stabilizer, wherein the heat stabilizer is a composite lead salt stabilizer;

[0058] The preparation method of the above soft wear-resistant cable comprises the following steps:

[0059] S1, preparation of wear-resistant layer 1 material: add chlorinated polyethylene resin, EPDM rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol, polycaprolactone polyol into a kneader and mix for 30 minutes, then keep the reaction temperature at 75°C to mix the components evenly, then heat to 95°C and add silicon carbide, calcium stearate, and plasticizer and mix for 40 minutes, cool, and send the material into a twin-screw two-stage extruder for extrusion granulation, the temperature of each zone of the screw is 135°C, to obtain the wear-resistant layer material;

[0060] S2, preparation of flame retardant layer 2 material: artificial mica, magnesium chloride, potassium chloride, vinyl triethoxysilane and divinyl triamine are added into an extruder for blending and extrusion. The extruder temperature is 120° C. and the blending time is 35 min to obtain a flame retardant layer material;

[0061] S3, twisting and pressing a plurality of copper wires to form a single copper core conductor 4;

[0062] S4, wrapping the insulating layer 5 on the copper core conductor 4;

[0063] S5, twisting the copper core conductor 4 wrapped with the insulating layer 5 into a cable core;

[0064] S6, wrap the cable core with a flame retardant layer and fill it with a heat insulation layer 3, where the heat insulation layer 3 is an inorganic refractory filling material;

[0065] S7, extruding the wear-resistant layer material into a sheath to form a wear-resistant layer 1, and obtaining a soft wear-resistant cable.

[0066] Comparative Example 1

[0067] This comparative example is a common flexible insulated wear-resistant cable on the market.

[0068] The performance of a flexible mineral insulated fire-resistant cable prepared in Examples 1-3 and the comparative example was tested, and the test results are shown in the following table:

[0069]

[0070] It can be concluded from the above table that the cable prepared by the present invention has greatly improved performance in flexibility, fire resistance and wear resistance compared with existing cables;

[0071] The invention comprises the following steps: adding chlorinated polyethylene resin, ethylene propylene diene monomer rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol and polycaprolactone polyol into a kneader for mixing, then adding silicon carbide, calcium stearate and a plasticizer for mixing for 20-40 minutes, cooling, and feeding the discharged material into a twin-screw two-stage extruder for extrusion granulation to obtain a wear-resistant layer material for preparing the wear-resistant layer outside the cable. The wear-resistant layer has the characteristic of being soft and greatly improves the wear resistance of the cable.

[0072] The flame retardant layer material is obtained by adding 5-8 parts of artificial mica, 8-16 parts of magnesium chloride, 1-12 parts of potassium chloride, 6-15 parts of vinyl triethoxysilane and 7-11 parts of divinyl triamine into an extruder for blending and extrusion, and the flame retardant layer of the cable is prepared. The flame retardant layer can fully protect the cable core of the cable when encountering a fire, effectively improve the fire resistance temperature of the cable and prolong the burning time, and can maintain normal and continuous power supply within a specified time at a specified flame temperature; it is conducive to carrying out fire rescue, reducing casualties and economic losses; and greatly improves the safety and comfort of the human living environment.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soft and wear-resistant cable, characterized in that: It comprises a copper core conductor (4) and a flame retardant layer (2), wherein an insulating layer (5) is sleeved on the copper core conductor (4), the insulating layer (5) is located inside the flame retardant layer (2), a heat insulation layer (3) is filled between the flame retardant layer (2) and the insulating layer (5), and a wear-resistant layer (1) is sleeved on the flame retardant layer (2); The wear-resistant layer (1) comprises the following raw materials in parts by weight: 50-60 parts of chlorinated polyethylene resin, 12-15 parts of ethylene propylene rubber, 20-30 parts of acetylene black, 2-4 parts of oxidized polyethylene ester, 7-9 parts of tetrabromobisphenol, 2-5 parts of polycaprolactone polyol, 1-10 parts of silicon carbide, 1-5 parts of calcium stearate, and 3-7 parts of plasticizer; The flame retardant layer (2) comprises the following raw materials in parts by weight: 5-8 parts of artificial mica, 8-16 parts of magnesium chloride, 1-12 parts of potassium chloride, 6-15 parts of vinyl triethoxy silane, 7-11 parts of diethylene triamine, and 4-9 parts of a heat stabilizer.

2. A soft wear-resistant cable according to claim 1, characterized in that: The plasticizer is selected from one of DOS, DOP and DOA.

3. A soft and wear-resistant cable according to claim 1, characterized in that: The heat stabilizer is any one of a calcium zinc stabilizer, a rare earth calcium zinc stabilizer, and a composite lead salt stabilizer.

4. A soft and wear-resistant cable according to claim 1, characterized in that: The wear-resistant layer (1) comprises the following raw materials in parts by weight: 52-58 parts of chlorinated polyethylene resin, 13-15 parts of ethylene propylene rubber, 20-27 parts of acetylene black, 3-4 parts of oxidized polyethylene ester, 7-8 parts of tetrabromobisphenol, 3-5 parts of polycaprolactone polyol, 3-9 parts of silicon carbide, 2-4 parts of calcium stearate, and 4-6 parts of plasticizer.

5. A soft wear-resistant cable according to claim 1, characterized in that: The wear-resistant layer (1) comprises the following raw materials in parts by weight: 55 parts of chlorinated polyethylene resin, 13 parts of ethylene propylene rubber, 25 parts of acetylene black, 3 parts of oxidized polyethylene ester, 8 parts of tetrabromobisphenol, 4 parts of polycaprolactone polyol, 6 parts of silicon carbide, 3 parts of calcium stearate, and 5 parts of plasticizer.

6. A soft wear-resistant cable according to claim 1, characterized in that: The flame retardant layer (2) comprises the following raw materials in parts by weight: 6-8 parts of artificial mica, 7-15 parts of magnesium chloride, 3-9 parts of potassium chloride, 8-13 parts of vinyl triethoxy silane, 8-10 parts of diethylene triamine, and 5-8 parts of heat stabilizer.

7. A soft and wear-resistant cable according to claim 1, characterized in that: The flame retardant layer (2) comprises the following raw materials in parts by weight: 7 parts of artificial mica, 12 parts of magnesium chloride, 7 parts of potassium chloride, 11 parts of vinyl triethoxy silane, 9 parts of diethylene triamine, and 7 parts of a heat stabilizer.

8. A method for preparing a soft wear-resistant cable according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Preparation of wear-resistant layer (1) materials: chlorinated polyethylene resin, ethylene propylene diene monomer rubber, acetylene carbon black, oxidized polyethylene ester, tetrabromobisphenol, and polycaprolactone polyol are added to a kneader and kneaded for 30 minutes, and then the reaction temperature is maintained at 75° C. to mix the components uniformly, and then the temperature is raised to 95° C. and silicon carbide, calcium stearate, and plasticizer are added and kneaded for 20-40 minutes. The mixture is cooled and the discharged material is sent to a twin-screw two-stage extruder for extrusion and granulation to obtain a wear-resistant layer material; S2. Preparation of flame retardant layer (2) material: adding artificial mica, magnesium chloride, potassium chloride, vinyl triethoxysilane and divinyl triamine into an extruder and blending and extruding to obtain a flame retardant layer material; S3, twisting and pressing a plurality of copper wires to form a single copper core conductor (4); S4, wrapping the insulating layer (5) on the copper core conductor (4); S5, twisting the copper core conductor (4) wrapped with an insulating layer (5) into a cable core; S6, wrapping the cable core with a flame retardant layer and filling it with a heat insulation layer (3), wherein the heat insulation layer (3) is an inorganic fire-resistant filling material; S7, extruding the wear-resistant layer material around the sheath to form a wear-resistant layer (1).

9. The method for preparing a soft wear-resistant cable according to claim 8, characterized in that: In step S1, the temperature of each zone of the screw is 125-135°C.

10. The method for preparing a soft wear-resistant cable according to claim 8, characterized in that: In step S2, the extruder temperature is 80-120° C., and the blending time is 20-35 min.

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