CN113270223A - Improved high-performance flame-retardant cable and flame-retardant layer thereof - Google Patents
Improved high-performance flame-retardant cable and flame-retardant layer thereof Download PDFInfo
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- H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
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Abstract
The invention relates to an improved high-performance flame-retardant cable which sequentially comprises a conductor with a circular structure, a conductor shielding layer, a fluoroplastic insulating layer and an insulating shielding layer, wherein filling is arranged in a gap of a cable core, a wrapping layer, a flame-retardant layer I, a braided layer, a flame-retardant layer II and an outer sheath are sequentially arranged outside the cable core and the filling, four humidity-sensitive insulating wire cores are embedded in the braided layer, two sides of each humidity-sensitive insulating wire core are respectively provided with a water-blocking rope, and the flame-retardant layer I and the flame-retardant layer II comprise the following steps: (1) mixing the raw materials step by step; (2) placing the mixture in an internal mixing furnace for mixing; (3) the copolymer was melted and injection molded. The invention has excellent transmission performance, takes away moisture by introducing larger current into the moisture-sensitive insulated wire core to dissipate heat, has good integral flame-retardant effect, long service life, excellent flame-retardant performance of the flame-retardant layer and convenient processing.
Description
Technical Field
The invention relates to a flame-retardant cable, in particular to a flame-retardant cable and a preparation method of a flame-retardant layer thereof.
Background
With the rapid development of national economy, the using amount and the application range of the cable used as the main artery of the national economy are larger and larger. In recent years, the demand of industries such as power plants, transformer substations, smelting, petrochemical industry and the like on cables is extremely large.
The existing flame-retardant cable has the following defects: the transmission performance of a conductor is general; secondly, the paint is used in a humid environment, and has no good solution to the entered moisture; and the flame retardant property has a space for improving.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects in the prior art and provide an improved high-performance flame-retardant cable which has excellent transmission performance, adopts a moisture-sensitive insulated wire core to introduce larger current for heat dissipation so as to take away moisture, and an improved flame-retardant layer of the high-performance flame-retardant cable which has excellent flame-retardant performance and is convenient to process.
The technical scheme is as follows: in order to solve the technical problems, the invention provides an improved high-performance flame-retardant cable, which comprises a carbon nano tube fiber bundle formed by twisting the carbon nano tube fiber bundle at the center of the cable, wherein a round structure conductor consisting of five groups of separated conductors is arranged outside the carbon nano tube fiber bundle, an insulating tape is arranged between the separated conductors, a fluoroplastic insulating layer is arranged outside the round structure conductor shielding layer, an insulating shielding layer is arranged outside the fluoroplastic insulating layer and forms an insulating wire core, a plurality of insulating wire cores are arranged in a tangent mode to form a cable core, filling is arranged in a gap between the cable cores, wrapping layers are arranged outside the cable core and the filling, a flame-retardant layer I is arranged outside the wrapping layers, a weaving layer is arranged outside the flame-retardant layer I, four moisture-sensitive insulating wire cores are embedded in the weaving layer and are divided into two groups symmetrically, each group of two adjacent sets, the moisture sensitive insulation core includes the conductor, the conductor outside is equipped with the moisture sensitive insulation layer, respectively establishes a rope that blocks water in every group moisture sensitive insulation core both sides, the rope that blocks water also imbeds the weaving layer in, be equipped with fire-retardant layer II in the weaving layer outside, be equipped with the oversheath in fire-retardant layer II outside.
Further, the outer sheath is a polyolefin outer sheath.
An improved flame-retardant layer of a high-performance flame-retardant cable comprises the following components in parts by weight,
(1) 65-80 parts of polyvinyl chloride resin;
(2) 40-55 parts of PVC resin;
(3) 30-40 parts of ethylene propylene diene monomer;
(4) 10-19 parts of dioctyl;
(5) 10-18 parts of calcium carbonate;
(6) 10-16 parts of an aluminum hydroxide flame retardant;
(7) 5-7 parts of a calcium zinc stabilizer;
(8) 1-2 parts of modified nano brucite
(9) 0.2-0.5 part of antioxidant;
the preparation method comprises the following steps of,
(1) weighing the raw materials according to the proportion, and mixing polyvinyl chloride resin, PVC resin, ethylene propylene diene monomer, dioctyl ester, calcium carbonate, aluminum hydroxide flame retardant and antioxidant in a high-speed mixer to obtain a mixture A; mixing the calcium-zinc stabilizer, the modified aluminum-magnesium hydrotalcite, the modified nano brucite and the mixture A in a high-speed mixer to obtain a mixed mixture B;
(2) placing the mixed mixture B into an internal mixing furnace for mixing, controlling the temperature at 260 ℃, and mixing for 27 minutes to obtain a copolymer;
(3) and (3) extruding the copolymer into a molten state in a double-screw extruder, extruding the mixture into an injection molding machine after the mixture is completely molten, and performing injection molding at 320 ℃ to obtain the copolymer.
Further, the modified nano brucite is prepared by the following steps:
(1) putting brucite into a calcining furnace at 540 ℃ to calcine for 8 hours to obtain a calcined substance A;
(2) dissolving the calcined substance A into distilled water, and then dropwise adding a sodium dodecyl benzene sulfonate solution with the concentration of 0.03mol/L to obtain a solution B;
(3) adding a sodium hydroxide solution with the concentration of 1.2mol/L into the solution B, and adjusting the pH value of the solution B to be 8 to obtain a solution C;
(4) carrying out reflux reaction on the solution C for 4.2h at the temperature of 92 ℃, and then carrying out centrifugal treatment to obtain a solid substance D;
(5) and (3) drying the solid substance at 60 ℃ for 15h to obtain the modified nano brucite.
Further, the antioxidant is a phenolic antioxidant or an amine antioxidant.
Further, the modified aluminum magnesium hydrotalcite is prepared by adding the aluminum magnesium hydrotalcite and silicon nitride into dimethylbenzene, performing ultrasonic dispersion to obtain dispersion liquid, and dripping NaH into the dispersion liquid at the speed of 15-20 drops/min2PO4•2H2Heating and stirring in the O solution, adjusting the pH value to about 5 by using dilute nitric acid, reacting for 5 hours, and naturally cooling to obtain the product.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the invention adds carbon nanotube fiber bundles in the copper or aluminum divided conductor, the conductive property of the carbon nanotube fiber bundles is far higher than that of metal conductors such as copper or aluminum, the current-carrying capacity is improved, simultaneously, the skin effect of the conductor is weakened, the current is more uniformly distributed in the conductor, a fluoroplastic insulating layer is adopted, the insulating effect is good, a flame-retardant layer I and a flame-retardant layer II are adopted, the overall flame-retardant effect is good, three moisture-sensitive insulating wire cores are embedded in a woven layer, a water-blocking rope is a hydrophilic water-blocking material, when moisture enters from the outside, more moisture is gathered in the water-blocking rope, the water-blocking rope is close to the moisture-sensitive insulating layer, the moisture-sensitive insulating layer can absorb the moisture, the resistivity of the insulating layer can be changed along with the moisture, the moisture-sensitive insulating layer adopts styrene polymers with strong polar groups to be copolymerized and crosslinked with acrylic acid, and when the insulating material meets the moisture, the water molecules are absorbed by the polar groups, more and more water molecules are condensed to form liquid water, the insulating material loses efficacy and becomes electrolyte solution capable of conducting electricity, so that the two insulating wire cores are conducted, and larger current is introduced to dissipate heat, so that moisture is taken away;
(2) according to the invention, the nano brucite is added, so that the weather resistance and the fire resistance of the cable are realized, and the cable can work in a high-temperature environment.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
As shown in figure 1, the improved high-performance flame-retardant cable comprises a carbon nano tube fiber bundle 1 formed by twisting the center of the cable, a round structure conductor consisting of five groups of separation conductors 2 is arranged outside the carbon nano tube fiber bundle 1, an insulating tape 3 is arranged between the separation conductors 2, a conductor shielding layer 4 is arranged outside the round structure conductor, a fluoroplastic insulating layer 5 is arranged outside the conductor shielding layer 4, an insulating shielding layer 6 is arranged outside the fluoroplastic insulating layer 5 and forms an insulating wire core, a plurality of insulating wire cores are arranged in a tangent mode to form a cable core, a filling 7 is arranged in a gap between the cable core and the filling 7, a wrapping layer 8 is arranged outside the cable core and the filling 7, a flame-retardant layer I9 is arranged outside the cable core 8, a braided layer 10 is arranged outside the flame-retardant layer I9, and four wet-sensitive insulating wire cores are embedded in the braided layer 10, the moisture-sensitive insulation cable core comprises conductors 11, a moisture-sensitive insulation layer 12 is arranged outside the conductors 11, a water blocking rope 13 is respectively arranged on two sides of each moisture-sensitive insulation core, the water blocking rope 13 is also embedded into a woven layer 10, a flame-retardant layer II 14 is arranged outside the woven layer 10, and an outer sheath 15 is arranged outside the flame-retardant layer II 14.
Further, the outer sheath 15 is a polyolefin outer sheath.
An improved flame-retardant layer of a high-performance flame-retardant cable comprises the following components in parts by weight,
(1) 68 parts of polyvinyl chloride resin;
(2) 44 parts of PVC resin;
(3) 35 parts of ethylene propylene diene monomer;
(4) 12 parts of dioctyl;
(5) 11 parts of calcium carbonate;
(6) 12 parts of an aluminum hydroxide flame retardant;
(7) 5.5 parts of a calcium zinc stabilizer;
(8) 1.5 parts of modified nano brucite
(9) 0.3 part of antioxidant;
the preparation method comprises the following steps of,
(1) weighing the raw materials according to the proportion, and mixing polyvinyl chloride resin, PVC resin, ethylene propylene diene monomer, dioctyl ester, calcium carbonate, aluminum hydroxide flame retardant and antioxidant in a high-speed mixer to obtain a mixture A; mixing the calcium-zinc stabilizer, the modified nano brucite and the mixture A in a high-speed mixer to obtain a mixed mixture B;
(2) placing the mixed mixture B into an internal mixing furnace for mixing, controlling the temperature at 260 ℃, and mixing for 27 minutes to obtain a copolymer;
(3) and (3) extruding the copolymer into a molten state in a double-screw extruder, extruding the mixture into an injection molding machine after the mixture is completely molten, and performing injection molding at 320 ℃ to obtain the copolymer.
Further, the modified nano brucite is prepared by the following steps:
(1) putting brucite into a calcining furnace at 540 ℃ to calcine for 8 hours to obtain a calcined substance A;
(2) dissolving the calcined substance A into distilled water, and then dropwise adding a sodium dodecyl benzene sulfonate solution with the concentration of 0.03mol/L to obtain a solution B;
(3) adding a sodium hydroxide solution with the concentration of 1.2mol/L into the solution B, and adjusting the pH value of the solution B to be 8 to obtain a solution C;
(4) carrying out reflux reaction on the solution C for 4.2h at the temperature of 92 ℃, and then carrying out centrifugal treatment to obtain a solid substance D;
(5) and (3) drying the solid substance at 60 ℃ for 15h to obtain the modified nano brucite.
Example 2
As shown in figure 1, the improved high-performance flame-retardant cable comprises a carbon nano tube fiber bundle 1 formed by twisting the center of the cable, a round structure conductor consisting of five groups of separation conductors 2 is arranged outside the carbon nano tube fiber bundle 1, an insulating tape 3 is arranged between the separation conductors 2, a conductor shielding layer 4 is arranged outside the round structure conductor, a fluoroplastic insulating layer 5 is arranged outside the conductor shielding layer 4, an insulating shielding layer 6 is arranged outside the fluoroplastic insulating layer 5 and forms an insulating wire core, a plurality of insulating wire cores are arranged in a tangent mode to form a cable core, a filling 7 is arranged in a gap between the cable core and the filling 7, a wrapping layer 8 is arranged outside the cable core and the filling 7, a flame-retardant layer I9 is arranged outside the cable core 8, a braided layer 10 is arranged outside the flame-retardant layer I9, and four wet-sensitive insulating wire cores are embedded in the braided layer 10, the moisture-sensitive insulation cable core comprises conductors 11, a moisture-sensitive insulation layer 12 is arranged outside the conductors 11, a water blocking rope 13 is respectively arranged on two sides of each moisture-sensitive insulation core, the water blocking rope 13 is also embedded into a woven layer 10, a flame-retardant layer II 14 is arranged outside the woven layer 10, and an outer sheath 15 is arranged outside the flame-retardant layer II 14.
Further, the outer sheath 15 is a polyolefin outer sheath.
An improved flame-retardant layer of a high-performance flame-retardant cable comprises the following components in parts by weight,
(1) 75 parts of polyvinyl chloride resin;
(2) 52 parts of PVC resin;
(3) 36 parts of ethylene propylene diene monomer;
(4) 17 parts of dioctyl;
(5) 13 parts of calcium carbonate;
(6) 14 parts of an aluminum hydroxide flame retardant;
(7) 6.5 parts of a calcium zinc stabilizer;
(8) 1.8 parts of modified nano brucite
(9) 0.4 part of antioxidant;
the preparation method comprises the following steps of,
(1) weighing the raw materials according to the proportion, and mixing polyvinyl chloride resin, PVC resin, ethylene propylene diene monomer, dioctyl ester, calcium carbonate, aluminum hydroxide flame retardant and antioxidant in a high-speed mixer to obtain a mixture A; mixing the calcium-zinc stabilizer, the modified nano brucite and the mixture A in a high-speed mixer to obtain a mixed mixture B;
(2) placing the mixed mixture B into an internal mixing furnace for mixing, controlling the temperature at 260 ℃, and mixing for 27 minutes to obtain a copolymer;
(3) and (3) extruding the copolymer into a molten state in a double-screw extruder, extruding the mixture into an injection molding machine after the mixture is completely molten, and performing injection molding at 320 ℃ to obtain the copolymer.
Further, the modified nano brucite is prepared by the following steps:
(1) putting brucite into a calcining furnace at 540 ℃ to calcine for 8 hours to obtain a calcined substance A;
(2) dissolving the calcined substance A into distilled water, and then dropwise adding a sodium dodecyl benzene sulfonate solution with the concentration of 0.03mol/L to obtain a solution B;
(3) adding a sodium hydroxide solution with the concentration of 1.2mol/L into the solution B, and adjusting the pH value of the solution B to be 8 to obtain a solution C;
(4) carrying out reflux reaction on the solution C for 4.2h at the temperature of 92 ℃, and then carrying out centrifugal treatment to obtain a solid substance D;
(5) and (3) drying the solid substance at 60 ℃ for 15h to obtain the modified nano brucite.
The invention adds carbon nanotube fiber bundles in the copper or aluminum divided conductor, the conductive property of the carbon nanotube fiber bundles is far higher than that of metal conductors such as copper or aluminum, the current-carrying capacity is improved, simultaneously, the skin effect of the conductor is weakened, the current is more uniformly distributed in the conductor, a fluoroplastic insulating layer is adopted, the insulating effect is good, a flame-retardant layer I and a flame-retardant layer II are adopted, the overall flame-retardant effect is good, three moisture-sensitive insulating wire cores are embedded in a woven layer, a water-blocking rope is a hydrophilic water-blocking material, when moisture enters from the outside, more moisture is gathered in the water-blocking rope, the water-blocking rope is close to the moisture-sensitive insulating layer, the moisture-sensitive insulating layer can absorb the moisture, the resistivity of the insulating layer can be changed along with the moisture, the moisture-sensitive insulating layer adopts styrene polymers with strong polar groups to be copolymerized and crosslinked with acrylic acid, and when the insulating material meets the moisture, the water molecules are absorbed by the polar groups, more and more water molecules are condensed to form liquid water, the insulating material loses efficacy and becomes electrolyte solution capable of conducting electricity, so that the two insulating wire cores are conducted, and larger current is introduced to dissipate heat, so that moisture is taken away; by adding the nano brucite, the weather resistance and the fire resistance of the cable are realized, so that the cable can work in a high-temperature environment.
The present invention provides a thought and a method, and a method and a way for implementing the technical scheme are many, the above is only a preferred embodiment of the present invention, it should be noted that, for a person skilled in the art, a plurality of improvements and modifications can be made without departing from the principle of the present invention, and the improvements and modifications should be regarded as the protection scope of the present invention, and each component not explicitly described in the embodiment can be implemented by the prior art.
Claims (4)
1. An improved high-performance flame-retardant cable is characterized in that: the cable comprises a carbon nano tube fiber bundle (1) formed by stranding at the center of a cable, wherein a circular structure conductor consisting of five groups of separation conductors (2) is arranged outside the carbon nano tube fiber bundle (1), an insulating tape (3) is arranged between the separation conductors (2), a conductor shielding layer (4) is arranged outside the circular structure conductor, a fluoroplastic insulating layer (5) is arranged outside the conductor shielding layer (4), an insulating shielding layer (6) is arranged outside the fluoroplastic insulating layer (5) and forms an insulating wire core, a plurality of insulating wire cores are tangentially arranged to form a cable core, a filling layer (7) is arranged in a cable core gap, a winding layer (8) is arranged outside the cable core and the filling layer (7), a flame-retardant layer I (9) is arranged outside the winding layer (8), a woven layer (10) is arranged outside the flame-retardant layer I (9), and four wet-sensitive insulating wire cores are embedded in the woven layer (10), the moisture-sensitive insulation cable core comprises conductors (11), a moisture-sensitive insulation layer (12) is arranged outside the conductors (11), a water blocking rope (13) is arranged on each of two sides of each moisture-sensitive insulation cable core, the water blocking ropes (13) are also embedded into a woven layer (10), a flame-retardant layer II (14) is arranged outside the woven layer (10), and an outer sheath (15) is arranged outside the flame-retardant layer II (14).
2. The improved high performance flame retardant cable of claim 1 wherein: the outer sheath (15) is a polyolefin outer sheath.
3. The improved flame retardant layer of high performance flame retardant cable according to claim 1, wherein: it comprises the following components in parts by weight,
(1) 65-80 parts of polyvinyl chloride resin;
(2) 40-55 parts of PVC resin;
(3) 30-40 parts of ethylene propylene diene monomer;
(4) 10-19 parts of dioctyl;
(5) 10-18 parts of calcium carbonate;
(6) 10-16 parts of an aluminum hydroxide flame retardant;
(7) 5-7 parts of a calcium zinc stabilizer;
(8) 1-2 parts of modified nano brucite
(9) 0.2-0.5 part of antioxidant;
the preparation method comprises the following steps of,
(1) weighing the raw materials according to the proportion, and mixing polyvinyl chloride resin, PVC resin, ethylene propylene diene monomer, dioctyl ester, calcium carbonate, aluminum hydroxide flame retardant and antioxidant in a high-speed mixer to obtain a mixture A; mixing the calcium-zinc stabilizer, the modified nano brucite and the mixture A in a high-speed mixer to obtain a mixed mixture B;
(2) placing the mixed mixture B into an internal mixing furnace for mixing, controlling the temperature at 260 ℃, and mixing for 27 minutes to obtain a copolymer;
(3) and (3) extruding the copolymer into a molten state in a double-screw extruder, extruding the mixture into an injection molding machine after the mixture is completely molten, and performing injection molding at 320 ℃ to obtain the copolymer.
4. The improved flame retardant layer of high performance flame retardant cable of claim 3 wherein: the modified nano brucite is prepared by the following steps:
(1) putting brucite into a calcining furnace at 540 ℃ to calcine for 8 hours to obtain a calcined substance A;
(2) dissolving the calcined substance A into distilled water, and then dropwise adding a sodium dodecyl benzene sulfonate solution with the concentration of 0.03mol/L to obtain a solution B;
(3) adding a sodium hydroxide solution with the concentration of 1.2mol/L into the solution B, and adjusting the pH value of the solution B to be 8 to obtain a solution C;
(4) carrying out reflux reaction on the solution C for 4.2h at the temperature of 92 ℃, and then carrying out centrifugal treatment to obtain a solid substance D;
(5) and (3) drying the solid substance at 60 ℃ for 15h to obtain the modified nano brucite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110561235.8A CN113270223A (en) | 2021-05-22 | 2021-05-22 | Improved high-performance flame-retardant cable and flame-retardant layer thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024139002A1 (en) * | 2022-12-30 | 2024-07-04 | 深圳市爱斯强科技有限公司 | Humidity-sensitive heating slurry and preparation method therefor, and atomizing core |
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