Compression-resistant photovoltaic cable and preparation method thereof

Abstract

The invention discloses a compression-resistant photovoltaic cable and a preparation method thereof, and relates to the technical field of cables. An anti-pressure photovoltaic cable comprises a copper conductor, an isolating layer is extruded outside the copper conductor, an insulating layer is extruded outside the isolating layer, an outer sheath is extruded outside the insulating layer, the isolating layer is made of a polyethylene material, and anti-dripping compounds are arranged inside the isolating layer and the insulating layer. The anti-dripping compound comprises the following components in parts by weight: 20-20 parts of sulfur silicon resin, 2-5 parts of white carbon black, 25-35 parts of a methacrylonitrile-butadiene-styrene copolymer, 10-20 parts of polyurethane rubber, 5-10 parts of polystyrene, 1-3 parts of a coupling agent, 3-8 parts of an auxiliary agent, 4-10 parts of a fuming inhibitor and 4-10 parts of a structural composition. The compression-resistant photovoltaic cable prepared by the invention has good compression resistance and tear resistance, the probability of cable combustion drop is reduced, the fire probability is reduced, and the safety is improved.

Description

Technical Field

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

[0002] With the booming communications industry, the communications network industry has shown a steady growth trend. Today's smart devices transmit multimedia data such as audio and video through photovoltaic cables. It is a communications cable consisting of two or more glass or plastic optical fiber cores. These optical fiber cores are located in a protective coating and covered by a plastic PVC outer casing. The bandwidth of optical fiber transmission greatly exceeds that of copper cables, and the maximum connection distance it supports is more than two kilometers. It is an inevitable choice for building larger-scale networks. It has the advantages of good resistance to electromagnetic interference, strong confidentiality, fast speed, and large transmission capacity. It is a necessary basic product in the future information society and is widely used in electricity, construction, communications and other fields.

[0003] Cables are usually installed outdoors, facing wind, sun, rain and possible mechanical pressure, so the research on a pressure-resistant photovoltaic cable is particularly important. Summary of the invention

[0004] The object of the present invention is to provide a pressure-resistant photovoltaic cable and a preparation method thereof, so as to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a pressure-resistant photovoltaic cable, comprising a copper conductor, an isolation layer extruded on the outside of the copper conductor, an insulating layer extruded on the outside of the isolation layer, an outer sheath extruded on the outside of the insulating layer, the isolation layer is made of polyethylene material, and anti-drip composites are provided inside the isolation layer and the insulating layer.

[0006] Furthermore, the anti-drip composite comprises the following components by weight: 20-30 parts of sulfur silicone resin, 2-5 parts of white carbon black, 25-35 parts of methacrylonitrile-butadiene-styrene copolymer, 10-20 parts of polyurethane rubber, 5-10 parts of polystyrene, 1-3 parts of coupling agent, 3-8 parts of auxiliary agent, and 4-10 parts of smoke suppressant.

[0007] Furthermore, the structured inhibitor is a vanadium, nickel, molybdenum, iron, silicon, or nitrogen compound.

[0008] Furthermore, the coupling agent is a titanate coupling agent or a silane coupling agent.

[0009] Furthermore, the molecular weight of the polyurethane rubber is 5000-10000.

[0010] Furthermore, the molecular weight of the polystyrene is 1000-2000.

[0011] Furthermore, the smoke suppressant is composed of one or more of molybdenum trioxide, octamolybdate, calcium molybdate, calcium phosphomolybdate, and zinc molybdate.

[0012] Furthermore, a method for preparing a pressure-resistant photovoltaic cable comprises the following preparation steps:

[0013] (1) Weigh polyurethane rubber, white carbon black and sulfur silicone resin in proportion, gradually disperse and add white carbon black into the polyurethane rubber, mix until uniform and transparent, add 1 / 2 weight of sulfur silicone resin, continue to mix until uniform, mix and cut into pieces, put the mixed rubber sheet into a mold, put it into a flat vulcanizer, vulcanize it at 200° C., then put the vulcanized rubber sheet into an oven at 150° C. for secondary vulcanization for 1 hour, and set aside;

[0014] (2) Weighing polystyrene, methacrylonitrile-butadiene-styrene copolymer, coupling agent, auxiliary agent, and smoke suppressant in proportion, adding the remaining sulfur silicone resin, and adding the film obtained in step (1) into a flat vulcanizer, vulcanizing for 30-35 minutes at 200° C. and a pressure of 9.5-10 MPa, and then mixing and granulating in a twin-screw extruder at a temperature of 140-150° C. and a screw speed of 200-300 r / min to obtain an anti-drip composite;

[0015] (3) extruding the copper alloy rod into a copper alloy wire, twisting a plurality of copper alloy wires into a shape by a stranding machine to obtain a copper conductor, wrapping an insulating layer around the outside of the copper conductor, extruding an insulating layer outside the insulating layer, mixing insulating layer pellets on an open mill, and then evenly extruding the mixed rubber on the insulating layer through a rubber extruder, and continuously passing through a high-temperature and high-pressure steam pipeline for vulcanization to obtain an insulating layer;

[0016] (4) The anti-drip polymer is filled into the isolation layer and the insulating layer, and the outer sheath is extruded outside the insulating layer, and then formed, air-cooled, and rolled up. The obtained wire is irradiated to obtain a photovoltaic cable.

[0017] Furthermore, during the vulcanization in step (3), water vapor is passed, the water vapor pressure is controlled at 0.8-1.2 MPa, and the line speed is controlled at 15-20 m / min.

[0018] Furthermore, the density of the outer sheath extruded in step (4) is 1.40-1.43 g / cm 3 , the extrusion preheating temperature is 60-65℃, and the extrusion guide temperature is 134-160℃.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] The present invention uses methacrylonitrile-butadiene-styrene copolymer and sulfur silicone resin to significantly increase the strength and elastic modulus of the melt of the anti-drip composite. The anti-drip composite is made into a photovoltaic new energy cable. After local combustion, the cable melt will not drip even if it is stretched due to its own high strength, which can play an anti-drip role, reduce ignition, and prevent the spread of fire. In addition, the cable melt strength and collapse resistance can be increased.

[0021] The present invention mixes and vulcanizes polystyrene, methacrylonitrile-butadiene-styrene copolymer, polyurethane rubber and sulfur silicone resin, so that the silver shear bands caused by elastic particles can fully play their role, and the impact resistance of the anti-drip composite is significantly improved. The composite is used for preparing cables, which is beneficial to improving the impact resistance and structural strength of the cables and enhancing the compression resistance of photovoltaic cables.

[0022] When the photovoltaic cable prepared by the present invention burns, the structured inhibitor releases crystalline water and absorbs a large amount of heat. At the same time, the dehydration reaction produces a large amount of water vapor, which can dilute the combustible gas and thus prevent combustion. In addition, a layer of infusible and non-combustible oxide hard shell is formed on the surface of the material, blocking the channel for the polymer to react with external thermal oxygen, thereby ultimately achieving flame retardancy and self-extinguishing of the cable. DETAILED DESCRIPTION

[0023] 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 making creative work are within the scope of protection of the present invention.

[0024] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe the method in detail. The test methods for various indicators of the cables prepared in the following examples are as follows:

[0025] Tensile strength: GB / T20218-2006;

[0026] Flame retardancy: Test the limiting oxygen index according to standard GB / T2406.2-2009;

[0027] Compressive strength: GB / T 50081-2002

[0028] Example 1

[0029] (1) Weigh 15 parts of polyurethane rubber, 3 parts of white carbon black and 25 parts of sulfur silicone resin in proportion, gradually disperse and add white carbon black into the polyurethane rubber, mix until uniform and transparent, add 1 / 2 weight of sulfur silicone resin, continue to mix until uniform, mix and cut into pieces, put the mixed rubber sheet into a mold, place it in a flat vulcanizer, vulcanize it at 200° C., then place the vulcanized rubber sheet in an oven at 150° C. for secondary vulcanization for 1 hour, and set aside;

[0030] (2) Weigh 5 parts of polystyrene, 30 parts of methacrylonitrile-butadiene-styrene copolymer, 3 parts of coupling agent, 3 parts of auxiliary agent, and 5 parts of smoke suppressant according to proportion, add the remaining sulfur silicone resin, and add it together with the film obtained in step (1) into a flat vulcanizer, vulcanize for 30 minutes at 200° C. and a pressure of 9.5 MPa, and then mix and granulate in a twin-screw extruder at a temperature of 140-150° C. and a screw speed of 200 r / min to obtain an anti-drip composite;

[0031] (3) extruding a copper alloy rod into a copper alloy wire, twisting a plurality of copper alloy wires into a shape by a stranding machine to obtain a copper conductor, wrapping an insulating layer around the outside of the copper conductor, and extruding an insulating layer on the outside of the insulating layer; mixing insulating layer pellets on an open mill, and then evenly extruding the mixed rubber on the insulating layer through a rubber extruder, and continuously passing through a high-temperature and high-pressure steam pipeline for vulcanization to obtain an insulating layer, and passing steam during vulcanization, the steam pressure is controlled at 0.8 MPa, and the line speed is controlled at 15 m / min;

[0032] (4) The anti-drip polymer is filled into the isolation layer and the insulating layer, and an outer sheath is extruded outside the insulating layer, and then formed, air-cooled, and rolled up. The obtained wire is irradiated to obtain a photovoltaic cable. The extrusion preheating temperature is 60°C and the extrusion guide temperature is 134°C.

[0033] Example 2

[0034] (1) Weigh 10 parts of polyurethane rubber, 3 parts of white carbon black and 20 parts of sulfur silicone resin in proportion, gradually disperse and add white carbon black into the polyurethane rubber, mix until uniform and transparent, add 1 / 2 weight of sulfur silicone resin, continue to mix until uniform, mix and cut into pieces, put the mixed rubber sheet into a mold, place it in a flat vulcanizer, vulcanize it at 200° C., then place the vulcanized rubber sheet in an oven at 150° C. for secondary vulcanization for 1 hour, and set aside;

[0035] (2) Weigh 5 parts of polystyrene, 20 parts of methacrylonitrile-butadiene-styrene copolymer, 3 parts of coupling agent, 3 parts of auxiliary agent, and 5 parts of smoke suppressant according to proportion, add the remaining sulfur silicone resin, and add it together with the film obtained in step (1) into a flat vulcanizer, vulcanize at 200° C. and a pressure of 10 MPa for 32 minutes, and then mix and granulate in a twin-screw extruder at a temperature of 140-150° C. and a screw speed of 300 r / min to obtain an anti-drip composite;

[0036] (3) extruding a copper alloy rod into a copper alloy wire, twisting a plurality of copper alloy wires into a shape by a stranding machine to obtain a copper conductor, wrapping an insulating layer around the outside of the copper conductor, and extruding an insulating layer on the outside of the insulating layer; mixing insulating layer pellets on an open mill, and then evenly extruding the mixed rubber on the insulating layer through a rubber extruder, and continuously passing through a high-temperature and high-pressure steam pipeline for vulcanization to obtain an insulating layer, and passing steam during vulcanization, the steam pressure is controlled at 1 MPa, and the line speed is controlled at 18 m / min;

[0037] (4) Filling the anti-drip polymer into the isolation layer and the insulation layer, extruding the outer sheath on the outside of the insulation layer, and then molding, air cooling, and winding. The obtained wire is irradiated to obtain a photovoltaic cable. The extrusion preheating temperature is 62°C and the extrusion guide temperature is 160°C.

[0038] Example 3

[0039] (1) Weigh 20 parts of polyurethane rubber, 3 parts of white carbon black and 30 parts of sulfur silicone resin in proportion, gradually disperse and add white carbon black into the polyurethane rubber, mix until uniform and transparent, add 1 / 2 weight of sulfur silicone resin, continue to mix until uniform, mix and cut into pieces, put the mixed rubber sheet into a mold, place it in a flat vulcanizer, vulcanize it at 200° C., then place the vulcanized rubber sheet in an oven at 150° C. for secondary vulcanization for 1 hour, and set aside;

[0040] (2) Weigh 10 parts of polystyrene, 40 parts of methacrylonitrile-butadiene-styrene copolymer, 3 parts of coupling agent, 3 parts of auxiliary agent, and 5 parts of smoke suppressant according to proportion, add the remaining sulfur silicone resin, and add it together with the film obtained in step (1) into a flat vulcanizer, vulcanize at 200° C. and a pressure of 10 MPa for 35 minutes, and then mix and granulate in a twin-screw extruder at a temperature of 140-150° C. and a screw speed of 200 r / min to obtain an anti-drip composite;

[0041] (3) extruding a copper alloy rod into a copper alloy wire, twisting a plurality of copper alloy wires into a shape by a stranding machine to obtain a copper conductor, wrapping an insulating layer around the outside of the copper conductor, and extruding an insulating layer on the outside of the insulating layer; mixing insulating layer pellets on an open mill, and then evenly extruding the mixed rubber on the insulating layer through a rubber extruder, and continuously passing through a high-temperature and high-pressure steam pipeline for vulcanization to obtain an insulating layer, and passing steam during vulcanization, the steam pressure is controlled at 1.2 MPa, and the line speed is controlled at 20 m / min;

[0042] (4) Filling the anti-drip polymer into the isolation layer and the insulation layer, extruding the outer sheath outside the insulation layer, and then molding, air cooling, and winding. The obtained wire is irradiated to obtain a photovoltaic cable. The extrusion preheating temperature is 65°C and the extrusion guide temperature is 160°C.

[0043] Comparative Example 1

[0044] The difference between Comparative Example 1 and Example 1 is that step (1) is changed to weigh 10 parts of polyurethane rubber, 3 parts of white carbon black and 20 parts of phosphorus silicone resin in proportion, gradually disperse and add white carbon black into the polyurethane rubber, mix until uniform and transparent, add 1 / 2 mass of phosphorus silicone resin, continue to mix until uniform, mix and cut, put the mixed film into a mold, place it in a flat vulcanizer, vulcanize it at 200° C., and then place the vulcanized film in an oven at 150° C. for secondary vulcanization for 1 hour for standby use;

[0045] Comparative Example 2

[0046] The difference between Comparative Example 2 and Example 1 is that in step (2), step (2) is changed to weigh 5 parts of polystyrene, 20 parts of methacrylonitrile-butadiene-styrene copolymer, 3 parts of coupling agent, and 3 parts of auxiliary agent in proportion, add the remaining sulfur silicone resin, and add it together with the film obtained in step (1) into a flat vulcanizer, vulcanize for 30 minutes at 200° C. and a pressure of 9.5 MPa, and then mix and granulate in a twin-screw extruder at a temperature of 140-150° C. and a screw speed of 200 r / min to obtain an anti-drip composite.

[0047] Effect example

[0048] Table 1 below shows the performance analysis results of the cables using Examples 1 to 3 of the present invention and Comparative Examples 1 to 2.

[0049] Table 1

[0050]

[0051]

[0052] From the data of the embodiments and comparative examples, it can be found that the present invention uses methacrylonitrile-butadiene-styrene copolymer and sulfur silicone resin to cooperate to significantly increase the strength and elastic modulus of the melt of the anti-drip composite. The anti-drip composite is made into a photovoltaic new energy cable. After local combustion, the cable melt will not drip even if it is stretched because of its own high strength, which can play an anti-drip role, reduce ignition, and prevent the spread of fire. In addition, the cable melt strength and collapse resistance can be increased. Polystyrene, methacrylonitrile-butadiene-styrene copolymer, polyurethane rubber and sulfur silicone resin are mixed and vulcanized, so that the silver grain shear band caused by elastic particles can be fully exerted, so that the impact resistance of the anti-drip composite is significantly improved, and it is used to prepare cables, which is beneficial to improve the impact resistance and structural strength of the cables and enhance the compression resistance of photovoltaic cables.

[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A pressure-resistant photovoltaic cable, characterized in that: The pressure-resistant photovoltaic cable comprises a copper conductor, an isolation layer is extruded outside the copper conductor, an insulating layer is extruded outside the isolation layer, an outer sheath is extruded outside the insulating layer, the isolation layer is made of polyethylene material, and anti-drip compounds are arranged inside the isolation layer and the insulating layer.

2. A pressure-resistant photovoltaic cable according to claim 1, characterized in that: The anti-dripping compound comprises the following components by weight: 20-30 parts of sulfur silicone resin, 2-5 parts of white carbon black, 25-35 parts of methacrylonitrile-butadiene-styrene copolymer, 10-20 parts of polyurethane rubber, 5-10 parts of polystyrene, 1-3 parts of coupling agent, 3-8 parts of auxiliary agent and 4-10 parts of smoke suppressant.

3. A pressure-resistant photovoltaic cable according to claim 2, characterized in that: The coupling agent is a titanate coupling agent or a silane coupling agent.

4. A pressure-resistant photovoltaic cable according to claim 2, characterized in that: The molecular weight of the polyurethane rubber is 5000-10000.

5. The pressure-resistant photovoltaic cable according to claim 2, characterized in that: The molecular weight of the polystyrene is 1000-2000.

6. A pressure-resistant photovoltaic cable according to claim 2, characterized in that: The smoke suppressant is composed of one or more of molybdenum trioxide, octamolybdate, calcium molybdate, calcium phosphomolybdate, and zinc molybdate.

7. A method for preparing a pressure-resistant photovoltaic cable, characterized in that: The method comprises the following preparation steps: (1) Weigh polyurethane rubber, white carbon black and sulfur silicone resin in proportion, gradually disperse and add white carbon black into the polyurethane rubber, mix until uniform and transparent, add 1 / 2 weight of sulfur silicone resin, continue to mix until uniform, mix and cut into pieces, put the mixed rubber sheet into a mold, put it into a flat vulcanizer, vulcanize it at 200° C., then put the vulcanized rubber sheet into an oven at 150° C. for secondary vulcanization for 1 hour, and set aside; (2) Weighing polystyrene, methacrylonitrile-butadiene-styrene copolymer, coupling agent, auxiliary agent, and smoke suppressant in proportion, adding the remaining sulfur silicone resin, and adding the film obtained in step (1) into a flat vulcanizer, vulcanizing for 30-35 minutes at 200° C. and a pressure of 9.5-10 MPa, and then mixing and granulating in a twin-screw extruder at a temperature of 140-150° C. and a screw speed of 200-300 r / min to obtain an anti-drip composite; (3) extruding the copper alloy rod into a copper alloy wire, twisting a plurality of copper alloy wires into a shape by a stranding machine to obtain a copper conductor, wrapping an insulating layer around the outside of the copper conductor, extruding an insulating layer outside the insulating layer, mixing insulating layer pellets on an open mill, and then evenly extruding the mixed rubber on the insulating layer through a rubber extruder, and continuously passing through a high-temperature and high-pressure steam pipeline for vulcanization to obtain an insulating layer; (4) The anti-drip polymer is filled into the isolation layer and the insulation layer, and an outer sheath is extruded outside the insulation layer, and then formed, air-cooled, and rolled up. The obtained wire is irradiated to obtain a photovoltaic cable.

8. The method for preparing a pressure-resistant photovoltaic cable according to claim 7, characterized in that: In the step (3), water vapor is passed during the vulcanization, the water vapor pressure is controlled at 0.8-1.2 MPa, and the line speed is controlled at 15-20 m / min.

9. A method for producing a pressure-resistant photovoltaic cable according to claim 7, characterized in that: The density of the outer sheath extruded in step (4) is 1.40-1.43 g / cm 3 , the extrusion preheating temperature is 60-65℃, and the extrusion guide temperature is 134-160℃.

Images