CN109285618B - High-flame-retardant fire-resistant low-smoke halogen-free cable and preparation method thereof - Google Patents
High-flame-retardant fire-resistant low-smoke halogen-free cable and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
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- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/187—Sheaths comprising extruded non-metallic layers
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- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
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- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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Abstract
The invention discloses a high-flame-retardant fire-resistant low-smoke halogen-free cable, which relates to the technical field of cables, and adopts the technical scheme that the cable comprises insulating cable cores, an oxygen isolation layer, glass fiber cloth and a protective layer, wherein the oxygen isolation layer, the glass fiber cloth and the protective layer are sequentially coated outside a plurality of insulating cable cores, and a glass fiber belt is filled between the oxygen isolation layer and the insulating cable cores; the insulated wire core comprises a copper wire, a fire-resistant layer coated outside the stranded copper wires, an insulating layer coated outside the fire-resistant layer and a plurality of layers of mica tapes coated outside the insulating layer; the refractory layer comprises the following components in parts by weight: 55-70 parts of polyethylene resin, 5-15 parts of smoke suppressant, 20-35 parts of modified viscose fiber, 5-15 parts of kevlar fiber, 10-25 parts of mineral flame retardant filler and 10-15 parts of halogen-free intumescent flame retardant. The invention solves the problems that the cable is easy to generate poisonous and harmful substances and has large smoke quantity when burning. Utilize structure between each layer to mutually support, and add modified viscose fiber in the flame retardant coating, not only can increase the fire-retardant fire resistance of cable, can also reduce the volume of giving off smoke, reduce harmful gas's formation.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a high-flame-retardant fire-resistant low-smoke halogen-free cable and a preparation method thereof.
Background
With the development of social economy, the use amount of wires and cables is rapidly increased, and electrical fire accidents frequently occur. From the heavy training of electric fire accidents, people gradually realize that main electric equipment in circuits of some important places, such as large-scale power stations, oil extraction platforms, petrochemical enterprises, ships, large command and control centers, high-rise buildings, underground buildings, tunnels, subways and the like, can keep normal operation within a certain time after a fire occurs, greatly help rescue work, and reduce casualties and property loss to the greatest extent.
In the prior art, reference may be made to a chinese patent application publication No. CN107236226A, which discloses a cable material with flame retardant function and a preparation method thereof, wherein the cable material comprises the following raw materials in parts by weight: 50-71 parts of PVC resin, 16-22 parts of EPDM resin, 1-5 parts of maleic anhydride grafted polyethylene, 4-5 parts of filling oil, 2-4 parts of flame retardant, 1-3 parts of inorganic filler, 0.6-2.6 parts of calcium-zinc stabilizer, 1.3-3.2 parts of fire retardant and 1-3 parts of plasticizer. The flame retardant comprises 80-99.95% of bromine flame retardant and 0.05-20% of flame retardant synergist in percentage by mass, and the existing cable material with the flame retardant function has excellent flame retardant effect, good flexibility, wear resistance and other physical and mechanical properties, but when the cable material is actually combusted, a large amount of toxic and harmful gas can be generated due to the bromine flame retardant contained in the flame retardant, and if a human body inhales into a respiratory tract, the cable material can cause harm to the human body and influence the rescue time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-flame-retardant fire-resistant low-smoke halogen-free cable, which has the advantages that the cable has flame-retardant and fire-resistant performance by using modified viscose as a material of a fire-resistant layer, the smoke quantity is low during combustion, and no harmful gas is contained.
In order to achieve the purpose, the invention provides the following technical scheme: a high flame-retardant fire-resistant low-smoke halogen-free cable comprises an insulating wire core, an oxygen-isolating layer, glass fiber cloth and a protective layer, wherein the oxygen-isolating layer is coated outside a plurality of mutually twisted insulating wire cores;
the insulating wire core comprises a copper wire, a fire-resistant layer coated outside the stranded copper wires, an insulating layer coated outside the fire-resistant layer and a plurality of layers of mica tapes coated outside the insulating layer;
the refractory layer comprises the following components in parts by weight: 55-70 parts of polyethylene resin, 5-15 parts of smoke suppressant, 20-35 parts of modified viscose fiber, 5-15 parts of kevlar fiber, 10-25 parts of mineral flame retardant filler and 10-15 parts of halogen-free intumescent flame retardant;
the insulating layer comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride resin, 15-20 parts of mineral flame-retardant filler, 10-15 parts of furan resin microcapsule, 10-15 parts of expandable graphite and 20-25 parts of calcium alginate fiber.
By adopting the technical scheme, the oxygen-insulating layer is coated on the periphery of the insulated wire core, so that oxygen can be prevented from entering the oxygen-insulating layer, the insulated wire core positioned in the oxygen-insulating layer is prevented from being contacted with the oxygen, the combustion speed of the cable is reduced, the glass fiber cloth can prevent heat and combustible gas from spreading to the interior of the glass fiber cloth, the heat and the combustible gas are isolated, and the protective layer can not only enhance the flame retardant property of the cable, but also enhance the mechanical property of the cable; insulating sinle silk is earlier with the flame retardant coating cladding, can increase the refractiveness and the fire resistance of copper conductor, make the copper conductor under the condition that high temperature is heated, difficult burning, including the insulating layer wraps flame retardant coating and copper conductor, increase the life who increases the flame retardant coating, at the outer surplus mica tape of cladding of insulating layer, the mica tape has good high temperature resistance and resistant burning performance, and when meetting the naked light, do not produce harmful smog basically, still reduce insulating layer and ultraviolet contact and cause the too fast phenomenon of oxidation rate, the life of extension insulating layer.
In the fire-resistant layer, the polyethylene resin has better fire resistance, the smoke suppressant can suppress the generation of dense smoke in the combustion process, the smoke amount is reduced, the combustion speed can be delayed, the modified bonding fiber has excellent fire resistance, the Kevlar fiber has high strength, high wear resistance and high tearing property, the mechanical property of the cable is improved, the Kevlar fiber does not generate molten drops in case of fire, toxic gas is not generated, the thickness is increased, and the sealing property of the fire-resistant layer is enhanced; the mineral flame-retardant filler can reduce the cost of raw materials and increase the strength and hardness of the cable; the halogen-free intumescent flame retardant does not contain halogen, can generate carbon foam during combustion, has the effects of heat insulation, oxygen insulation, smoke suppression and drip prevention, has excellent flame retardant property, and generates low smoke, low toxicity and no corrosive gas; in the insulating layer, the polyvinyl chloride resin has good insulating property, the expandable graphite can form a carbon layer on the surface of the polyvinyl chloride resin to separate combustible materials from a heat source, the expandable graphite can absorb a large amount of heat in the expansion process to reduce the temperature of the cable, and acid radical ions can be released in the expansion process of the expandable graphite to promote dehydration and carbonization; the furan resin is a polycondensation product obtained by homopolymerization of furfural or furfuryl alcohol or copolycondensation of the furfural or furfuryl alcohol and other monomers, the outer wall of the furan resin is wrapped by melamine-formaldehyde resin to form furan resin microcapsules, the furan resin microcapsules have good flame retardance and less smoke generation during combustion, the melamine-formaldehyde resin can increase the flame retardance of the furan resin, the melamine-formaldehyde resin is not easy to drop in the combustion process, the combusted furan resin microcapsules can be self-healed, and the color of the cable can be kept consistent after combustion; a large amount of water and carbon dioxide are released in the decomposition process of the sodium alginate fibers, water molecules are vaporized to absorb a large amount of heat, the surface temperature of the fibers is reduced, the flame retardant effect is achieved, the produced water vapor and the produced carbon dioxide belong to inert gases, the concentration of combustible gases decomposed from the sodium alginate is diluted, the flame retardant effect is achieved, and meanwhile, the furan resin microcapsules and the calcium alginate fibers are jointly used to increase the oxidation resistance of the cable.
The invention is further configured to: the preparation method of the modified viscose fiber comprises the following steps: (1) mixing hexaphenoxycyclotriphosphazene, stearic acid amide and polyacrylamide in a mass ratio of 1:0.5-1.1:0.3-0.9, and stirring for 20-30 min; (2) and (2) adding the cellulose xanthate solution into the mixed solution in the step (1), wherein the mass ratio of the hexaphenoxycyclotriphosphazene to the cellulose xanthate solution is 1:4-5, stirring for 10-20min, and spinning after curing for 120min through 100-10 min, wherein the coagulation bath used in the spinning process comprises 130g/L sulfuric acid through 120-L, 250g/L sodium sulfate through 210-L and 8-10g/L zinc sulfate, and the temperature of the coagulation bath is 40-50 ℃, so as to obtain the modified viscose.
By adopting the technical scheme, the modified bonding fiber is prepared by using a blending method, hexaphenoxycyclotriphosphazene is added into a cellulose sulfonate solution, when the cellulose sulfonate solution is coagulated into viscose fiber in a coagulation bath, the hexaphenoxycyclotriphosphazene is inlaid on the formed viscose fiber, so that the viscose fiber has good flame retardance, polyacrylamide is used as a cross-linking agent, cross-linking points can be generated in the viscose fiber, the hexaphenoxycyclotriphosphazene can be conveniently attached to the viscose fiber, and the attachment rate of the hexaphenoxycyclotriphosphazene is improved.
The invention is further configured to: and (3) solidifying the modified viscose fiber prepared after spinning in the step (2) for 10-15min by using a sodium hydroxide solution with the temperature of 80-90 ℃, the concentration of 1-3g/L and the water bath ratio of 1:5-8 to the modified viscose fiber.
Through adopting above-mentioned technical scheme, use sodium hydroxide solution to carry out solidification treatment to modified viscose fiber, can solidify carbon element and hydrogen element, reduce the formation amount of combustible volatile component, and the carbon element and the hydrogen element after the solidification have lower heat-conducting property, can prevent that the heat from spreading to the flame retardant coating is inside, and the combustible gas that blocks the outside production simultaneously spreads to the flame retardant coating is inside.
The invention is further configured to: the smoke suppressant comprises the following components in parts by weight: 4-8 parts of magnesium hydroxide, 4-8 parts of aluminum hydroxide and 2-6 parts of ammonium octamolybdate.
By adopting the technical scheme, the magnesium hydroxide and the aluminum hydroxide are filling type smoke inhibitors, the magnesium hydroxide and the aluminum hydroxide are heated to be separated into water vapor, the water vapor and the carbon particles are further oxidized at high temperature, the smoke generation amount of the cable is reduced, the water vapor can dilute the combustible gas, the burning speed is reduced, and after the aluminum hydroxide and the magnesium hydroxide are lost, the cable is cooled by absorbing heat, so that high polymers cannot be fully burnt, a carbonization protective layer is formed on the surface of the cable, the formation of soot is avoided, oxygen is prevented from entering, and the escape of the combustible gas can also be prevented; ammonium octamolybdate can inhibit the formation of benzene derivatives, and has good smoke inhibiting and flame retarding effects.
The invention is further configured to: the protective layer comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride resin, 5-15 parts of layered silicate nano flame retardant and 5-10 parts of epoxy resin microcapsule.
By adopting the technical scheme, the polyethylene resin has good insulating property, the phyllosilicate nano flame retardant is a novel flame retardant material, has the advantages of high flame retardant efficiency, low addition amount, no halogen, no toxicity, environmental friendliness and the like, and the epoxy resin microcapsule has stronger viscosity, so that the protective layer and the glass fiber cloth can be adhered tightly to prevent the protective layer and the glass fiber cloth from being layered.
The invention is further configured to: the oxygen barrier layer comprises the following components in parts by weight: 50-70 parts of polyethylene resin, 5-10 parts of a charring agent and 1-2 parts of polyethylene wax.
Through adopting above-mentioned technical scheme, polyethylene resin has good insulating properties, and under higher temperature, the carbon chain fracture can be followed to the charring agent, loses the carbon chain of hydroxyl and forms the active carbon, and the active carbon parcel is taken at the mica, prevents thermal transmission, and can prevent that oxygen from leading into inside separating the oxygen layer, prevents other effluences of flammability simultaneously, and polyethylene wax can increase the mixing degree of consistency between charring agent and the polyethylene resin.
The invention is further configured to: the carbon forming agent is one or a mixture of at least two of cellulose and derivatives, sucrose, sorbitol, epoxy resin and phenolic resin.
By adopting the technical scheme, under the condition that cellulose and derivatives, cane sugar, sorbitol, epoxy resin and phenolic resin have enough heat, hydroxyl can be separated from a carbon chain to form activated carbon, and the heat is prevented from being transferred to the inside of the oxygen isolation layer.
The invention is further configured to: the mineral flame-retardant filler is one or a combination of montmorillonite, silica micropowder, mica powder and kaolin.
Through adopting above-mentioned technical scheme, the montmorillonite can produce a large amount of carbon dioxide when burning, and carbon dioxide can reduce the speed of burning, and the silicon differential can increase coefficient of heat conductivity, changes the viscose performance, and the fire resistance of mineral fire retardant can be increased as flame retardant material to the mica powder, and kaolin not only can increase the fire resistance of cable, can also increase the insulating nature of cable.
The invention is further configured to: the particle size of the expandable graphite is 80-200 meshes, and the expansion ratio is 200-350 mL/g; by adopting the technical scheme, the expandable graphite with the particle size of 80-200 meshes is used, and the expansion rate is 200-350mL/g, so that the expandable graphite has better expansion rate, and the cable has good flame retardant property.
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a high-flame-retardant fire-resistant low-smoke halogen-free cable, which utilizes modified viscose as a fire-resistant layer material, so that the cable has high flame-retardant and fire-resistant properties, and is low in smoke generation amount and free from harmful gas during combustion.
In order to achieve the purpose, the invention provides the following technical scheme: the preparation method of the high flame-retardant fire-resistant low-smoke halogen-free cable is characterized by comprising the following steps of: the method comprises the following steps: (1) drawing and annealing;
(2) extrusion molding of flame retardant coating, package: weighing the components of the fire-resistant layer according to the weight parts, adding the components into a stirrer to stir for 20-30 minutes, performing melt extrusion, putting the extruded product into a hot press to be pressed and molded, wherein the temperature of the hot press is 270-280 ℃, the pressure is 16-18MPa, and the hot pressing time is 10-20s, pressing the fire-resistant layer, and wrapping the fire-resistant layer on the copper wire;
(3) extrusion molding of insulating layer, package: weighing the components of the insulating layer according to the weight parts, adding the components into a stirrer to stir for 20-30min, performing melt extrusion, performing secondary heating on the extruded product at the heating temperature of 100-120 ℃ for 20-30s, then putting the heated product into a hot press, controlling the temperature of the hot press at 270-280 ℃, the pressure at 16-20MPa and the hot pressing time at 10-20s, pressing the insulating layer, and wrapping the insulating layer on a refractory layer;
(4) lapping a mica tape: stranding a plurality of copper wires coated with an insulating layer, and wrapping at least two layers of mica tapes outside the insulating layer to form an insulating wire core;
(5) separate the extrusion molding on oxygen layer, wrap: weighing the components of the oxygen-barrier layer according to the weight parts, putting the components into a stirrer, stirring for 20-30min, performing melt extrusion, putting the extruded product into a hot press for pressing and molding, wherein the pressing temperature is 260-270 ℃, the pressing pressure is 15-18MPa, and the pressing time is 16-20s, pressing the oxygen-barrier layer, wrapping the oxygen-barrier layer outside a plurality of stranded insulated wire cores, and filling a glass fiber tape between the insulated wire cores and the oxygen-barrier layer;
(6) wrapping glass fiber cloth: wrapping glass fiber cloth on the periphery of the oxygen isolation layer;
(7) extrusion molding of protective layer, package: weighing the components of the protective layer according to the weight parts, putting the components into a stirrer, stirring for 20-30min, carrying out melt extrusion, putting the extruded product into a press, controlling the pressing temperature to be 280-320 ℃, the pressure to be 15-20Mpa and the pressing time to be 14-16s, pressing out the protective layer, and wrapping the protective layer on the periphery of the glass fiber cloth in a wrapping manner.
Through adopting above-mentioned technical scheme, use mutually supporting between each layer, increase fire-retardant, the fire resistance of cable, use mica tape parcel insulating layer, form insulating core, at insulating core and separate the oxygen layer between fill the glass fiber area, can increase the intensity and the hardness of cable, use the fine cloth of glass to wrap around the package outside separating the oxygen layer, increase the mechanical properties of cable.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the periphery of the copper conductor is coated with the fire-resistant layer, the insulating layer and the plurality of layers of mica tapes to form the insulating wire core, the insulating wire core is sequentially coated with the oxygen-insulating layer, the glass fiber cloth and the protective layer, and the glass fiber tape is filled between the insulating wire core and the oxygen-insulating layer, so that the fire spreading speed can be reduced when the cable is on fire;
(2) according to the invention, the modified viscose fiber is used in the fire-resistant layer, so that the fire-resistant and flame-retardant performance of the cable can be enhanced, and the modified viscose fiber does not contain halogen and does not contain generated dense smoke and harmful gas;
(3) according to the invention, the furan resin microcapsule is added into the fire-resistant layer, and the melamine-formaldehyde resin is used for coating the furan resin, so that the fire resistance of the furan resin can be increased, the color of the cable can be kept consistent after combustion, and the cable after combustion can be maintained conveniently;
(4) according to the invention, the furan resin microcapsules and the sodium alginate fibers are matched in the fire-resistant layer, so that the oxidation resistance of the cable can be increased;
(5) according to the invention, the smoke inhibitor is added into the fire-resistant layer, so that the generation of smoke and harmful gas caused by cable combustion can be inhibited, and the smoke quantity is reduced;
(6) according to the invention, the Kevlar fiber is added into the fire-resistant layer, so that no molten drop is generated when the Kevlar fiber meets fire, no toxic gas is generated, and the thickness of the Kevlar fiber is increased when the Kevlar fiber meets fire, so that the sealing property of the fire-resistant layer can be enhanced, and combustible gas and oxygen are prevented from entering the fire-resistant layer.
Drawings
Fig. 1 is a position structure diagram of each layer of the high flame-retardant fire-resistant low-smoke halogen-free cable in example 1.
In the figure: 1. an insulated wire core; 11. a copper wire; 12. a refractory layer; 13. an insulating layer; 14. mica tapes; 2. an oxygen barrier layer; 21. a glass fiber tape.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1: a high-flame-retardant fire-resistant low-smoke halogen-free cable is shown in figure 1 and comprises a plurality of (three in this embodiment) insulating wire cores 1 which are mutually twisted, an oxygen isolation layer 2 which covers the insulating wire cores 1, a glass fiber cloth 3 which covers the oxygen isolation layer 2 and a protective layer 4 which covers the glass fiber cloth 3, wherein the insulating wire cores 1 comprise copper wires 11, a fire-resistant layer 12, an insulating layer 13 and a mica tape 14 from inside to outside, the copper wires 11 are provided with a plurality of (four in this embodiment) and are mutually twisted, the mica tape 14 is provided with a plurality of layers (two layers in this embodiment), the oxygen isolation layer 2 covers the mica tape 14, and a glass fiber tape 21 is filled between the oxygen isolation layer 2 and the mica tape 14.
The refractory layer 12 comprises the following components in parts by weight: 55 parts of polyethylene resin, 5 parts of smoke suppressant, 20 parts of modified viscose, 5 parts of Kevlar fiber, 10 parts of mineral flame retardant filler and 10 parts of halogen-free intumescent flame retardant;
wherein the smoke suppressant comprises the following components in parts by weight: 4 parts of magnesium hydroxide, 4 parts of aluminum hydroxide and 22 parts of ammonium octamolybdate;
the preparation method of the modified viscose fiber comprises the following steps: (1) mixing hexaphenoxycyclotriphosphazene, stearic acid amide and polyacrylamide in a mass ratio of 1:0.7:0.7, and stirring for 20 min; (2) adding a cellulose xanthate solution into the mixed solution obtained in the step (1), wherein the mass ratio of hexaphenoxycyclotriphosphazene to the cellulose xanthate solution is 1:4.6, stirring for 10min, and spinning after 100min of ripening, wherein a coagulation bath used in the spinning process comprises 120g/L sulfuric acid, 210g/L sodium sulfate and 8g/L zinc sulfate, the temperature of the coagulation bath is 40 ℃, so that the modified viscose is prepared, and the modified viscose is cured for 10min by using a sodium hydroxide solution which has the temperature of 80 ℃, the concentration of 1g/L and the water-bath ratio of 1:5 to the modified viscose;
the insulating layer 13 comprises the following components in parts by weight: 50 parts of polyvinyl chloride resin, 15 parts of montmorillonite, 10 parts of furan resin microcapsule, 10 parts of expandable graphite and 20 parts of calcium alginate fiber; wherein the granularity of the expandable graphite is 80 meshes, and the expansion multiplying power is 200 mL/g;
the oxygen barrier layer 2 comprises the following components in parts by weight: 50 parts of polyethylene resin, 5 parts of epoxy resin and 1 part of polyethylene wax;
the protective layer 4 comprises the following components, by weight, 50 parts of polyvinyl chloride resin, 5 parts of layered silicate nano flame retardant and 5 parts of epoxy resin microcapsule.
The preparation method of the high-flame-retardant fire-resistant low-smoke halogen-free cable comprises the following steps: (1) wire drawing and annealing: uniformly coating a layer of wire drawing liquid SX-803 on the surface of a copper rod, performing wire drawing treatment on a wire drawing machine to draw the copper rod into a copper wire 11 with the diameter of 0.04mm, putting the copper wire 11 into an annealing furnace, controlling the furnace temperature at 550 ℃, and then allowing the copper wire 11 to pass through cooling water with the temperature of 20 ℃;
(2) extrusion molding and wrapping of the refractory layer 12: weighing the components of the flame retardant coating 12 according to the weight parts, adding polyethylene resin, a smoke suppressant, a modified viscose fiber, a Kevlar fiber, a mineral flame retardant filler and a halogen-free intumescent flame retardant into a stirrer, stirring for 20 minutes, carrying out melt extrusion, putting the extruded product into a hot press for compression molding, pressing the hot press into a flame retardant coating, and wrapping the flame retardant coating 12 on a copper wire 11, wherein the temperature of the hot press is 270 ℃, the pressure of the hot press is 16MPa, and the hot pressing time is 10 s;
(3) insulating layer 13's extrusion molding, package: weighing the components of the insulating layer 13, polyvinyl chloride resin, mineral flame-retardant filler, furan resin microcapsules, expandable graphite and calcium alginate fibers in parts by weight, adding the components into a stirrer, stirring for 20min, performing melt extrusion, performing secondary heating on the extruded product at the heating temperature of 100 ℃ for 20s, putting the heated product into a hot press, controlling the temperature of the hot press to be 270 ℃, the pressure to be 16MPa and the hot pressing time to be 16s, pressing the insulating layer, and wrapping the insulating layer 13 on the refractory layer 12;
(4) lapping of the mica tape 14: stranding a plurality of copper wires 11 coated with an insulating layer 13, and winding at least two layers of mica tapes 14 outside the insulating layer 13 to form an insulating wire core 1;
(5) separate the extrusion molding of oxygen layer 2, wrap: weighing the components of the oxygen-barrier layer 2 according to the parts by weight, putting the polyethylene resin, the carbon forming agent and the polyethylene wax into a stirrer, stirring for 20min, carrying out melt extrusion, putting the extruded product into a hot press for pressing and forming, wherein the pressing temperature is 260 ℃, the pressing pressure is 15MPa, and the pressing time is 16s, pressing the oxygen-barrier layer 2, wrapping the oxygen-barrier layer 2 outside a plurality of stranded insulated wire cores 1, and filling a glass fiber tape 21 between the insulated wire cores 1 and the oxygen-barrier layer 2;
(6) wrapping of glass fiber cloth 3: wrapping glass fiber cloth 3 around the oxygen isolating layer 2;
(7) extrusion molding of protective layer 4, wrap: weighing the components of the protective layer 4 in parts by weight: the polyvinyl chloride resin, the layered silicate nano flame retardant and the epoxy resin microcapsule are put into a stirrer to be stirred for 20min, the mixture is melted and extruded, the extruded product is put into a pressing machine, the pressing temperature is controlled at 280 ℃, the pressure is controlled at 15Mpa, the pressing time is controlled at 14s, the protective layer 4 is pressed, and the protective layer 4 is wrapped on the periphery of the glass fiber cloth 3.
Examples 2 to 6: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the content of each component in the fire-resistant layer 12 is shown in table 1.
TABLE 1 contents of components in refractory layers in examples 2-6
Examples 7 to 10: a high flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the contents of the components in the insulating layer 13 are shown in Table 2.
TABLE 2 contents of respective components in insulating layers in examples 7 to 10
Examples 11 to 14: the high flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the content of each component in the oxygen barrier layer 2 is shown in table 3.
Table 3 content of each component in the oxygen barrier layer in examples 11 to 14
Examples 15 to 18: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the content of each component in the protective layer 4 is shown in table 4.
Table 4 contents of respective components in protective layers in examples 15 to 18
Example 19: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to stearic acid amide in the preparation of the modified viscose fiber is 1: 0.5.
Example 20: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to stearic acid amide in the preparation of the modified viscose fiber is 1: 0.9.
Example 21: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to stearic acid amide in the preparation of the modified viscose fiber is 1: 1.1.
Example 22: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide in the preparation of the modified viscose fiber is 1: 0.3.
Example 23: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide in the preparation of the modified viscose fiber is 1: 0.5.
Example 24: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide in the preparation of the modified viscose fiber is 1: 0.9.
Example 25: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the mass ratio of hexaphenoxycyclotriphosphazene to cellulose xanthate solution in the preparation of the modified viscose fiber is 1: 4.2.
Example 26: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the mass ratio of hexaphenoxycyclotriphosphazene to cellulose xanthate solution in the preparation of the modified viscose fiber is 1: 4.4.
Example 27: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the mass ratio of hexaphenoxycyclotriphosphazene to cellulose xanthate solution in the preparation of the modified viscose fiber is 1: 4.8.
Example 28: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the mass ratio of hexaphenoxycyclotriphosphazene to cellulose xanthate solution in the preparation of the modified viscose fiber is 1: 5.0.
Comparative example 1: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to stearic acid amide in the preparation of the modified viscose fiber is 1: 0.3.
Comparative example 2: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to stearic acid amide in the preparation of the modified viscose fiber is 1: 1.3.
Comparative example 3: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide in the preparation of the modified viscose fiber is 1: 0.1.
Comparative example 4: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide in the preparation of the modified viscose fiber is 1: 1.1.
Comparative example 5: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the mass ratio of hexaphenoxycyclotriphosphazene to cellulose xanthate solution in the preparation of the modified viscose fiber is 1: 3.8.
Comparative example 6: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the mass ratio of hexaphenoxycyclotriphosphazene to cellulose xanthate solution in the preparation of the modified viscose fiber is 1: 5.2.
Comparative example 7: a high flame-retardant fire-resistant low-smoke halogen-free cable, which is different from the cable in example 1 in that the fire-resistant layer 12 does not contain modified viscose fiber.
Comparative example 8: the difference between the high-flame-retardant fire-resistant low-smoke halogen-free cable and the embodiment 1 is that the flame-retardant layer 12 does not contain Kevlar fibers.
Comparative example 9: a high flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the insulating layer 13 does not contain furan resin microcapsules.
Comparative example 10: the high-flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the insulating layer 13 does not contain calcium alginate fibers.
Comparative example 11: a high flame-retardant fire-resistant low-smoke halogen-free cable is different from the cable in example 1 in that the insulating layer 13 does not contain expandable graphite.
The high-flame-retardant fire-resistant low-smoke halogen-free cable is prepared according to the methods in the examples 1, 19-21 and 1-2, wherein the mass ratio of the raw materials hexaphenoxycyclotriphosphazene, polyacrylamide and cellulose xanthate solution for preparing the modified viscose fiber in the fire-resistant layer 12 is 1:0.7:4.6, the high-flame-retardant fire-resistant low-smoke halogen-free cable prepared from the materials in the examples 1, 19-20 and 1-2 is subjected to a flame-retardant experiment, and the mechanical properties of the cable are detected according to JBT10707-2007, wherein the flame-retardant experiment is carried out according to the following method: the method comprises the steps of vertically placing a cable with the length of 15-20cm, burning for 15s by using an experimental blast burner with the flame height of 125mm and the thermal power of 500W, stopping 15s, repeatedly burning for 5 times, observing the burning time of the residual flame, calculating the burning loss degree according to the mass of the cable after the flame is extinguished, wherein the burning loss degree is (the mass before burning-the mass after burning)/the mass before burning multiplied by 100%, detecting the influence of the mass ratio of hexaphenoxycyclotriphosphazene and stearamide in the modified viscose on the cable performance, and testing the results as shown in Table 5.
TABLE 5 test results of the impact of the mass ratio of hexaphenoxycyclotriphosphazene to stearamide on the cable performance
As can be seen from the data in Table 5, when the mass ratio of hexaphenoxycyclotriphosphazene to stearamide is 1:0.3 in comparative example 1, the cable has longer combustion time, larger combustion degree, higher tensile strength, smaller elongation at break, more haloid gas content, larger toxicity index, oxygen index of more than 40, lower pH value of the discharged gas, lower volume resistivity at 20 ℃, and when the mass ratio of hexaphenoxycyclotriphosphazene to stearamide is 1:0.5 in example 19, the combustion time is reduced, and other detection data are greatly changed, so that the high-flame-retardant fire-resistant low-smoke halogen-free cable has good mechanical properties when the mass ratio of hexaphenoxycyclotriphosphazene to stearamide is 1: 0.5-1.1.
The high-flame-retardant fire-resistant low-smoke halogen-free cable is prepared according to the methods in the example 1, the examples 22 to 24 and the comparative examples 3 to 4, wherein the mass ratio of the raw materials hexaphenoxycyclotriphosphazene, the stearic acid amide and the cellulose xanthate solution for preparing the modified viscose fiber in the fire-resistant layer 12 is 1:0.7:4.6, the high-flame-retardant fire-resistant low-smoke halogen-free cable prepared from the materials in the example 1, the examples 22 to 24 and the comparative examples 3 to 4 is subjected to a flame-retardant experiment, and the mechanical properties of the cable are detected according to JBT10707-2007, wherein the flame-retardant experiment is carried out according to the following method: the method comprises the steps of vertically placing a cable with the length of 15-20cm, burning for 15s by using an experimental blast burner with the flame height of 125mm and the thermal power of 500W, stopping 15s, repeatedly burning for 5 times, observing the burning time of residual flame, calculating the burning loss degree according to the mass of the cable after the flame is extinguished, wherein the burning loss degree is (mass before burning-mass after burning)/mass before burning multiplied by 100%, and detecting the influence of the mass ratio of hexaphenoxycyclotriphosphazene and polyacrylamide in the modified viscose on the cable performance, wherein the test results are shown in Table 6.
TABLE 6 test results of the impact of the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide on the cable performance
As can be seen from the data in Table 6, when the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide is 1:0.1 in the comparative example 3, the cable has longer combustion time, larger combustion degree, larger tensile strength, smaller elongation at break, more haloid gas content, larger toxicity index, oxygen index of more than 40, lower pH value of the discharged gas, lower volume resistivity at 20 ℃, and when the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide is 1:0.3 in the example 22, the combustion time is obviously reduced, the combustion degree is also obviously reduced, the tensile strength is obviously reduced, and other detection data are greatly changed, so that when the mass ratio of hexaphenoxycyclotriphosphazene to polyacrylamide is 1:0.3-1.1, the high-flame-retardant fire-resistant low-smoke halogen-free cable has good mechanical properties.
The high-flame-retardant fire-resistant low-smoke halogen-free cable is prepared according to the methods in the example 1, the examples 25 to 28 and the comparative examples 5 to 6, wherein the mass ratio of the raw materials hexaphenoxycyclotriphosphazene, stearic acid amide and polyacrylamide for preparing the modified viscose fiber in the fire-resistant layer 12 is 1:0.7:0.7, the high-flame-retardant fire-resistant low-smoke halogen-free cable prepared from the materials in the example 1, the examples 19 to 20 and the comparative examples 1 to 2 is subjected to a flame-retardant experiment, and the mechanical properties of the cable are detected according to JBT10707-2007, wherein the flame-retardant experiment is carried out according to the following method: the method comprises the steps of vertically placing a cable with the length of 15-20cm, burning for 15s by using an experimental blast burner with the flame height of 125mm and the thermal power of 500W, stopping 15s, repeatedly burning for 5 times, observing the burning time of the residual flame, calculating the burning loss degree according to the mass of the cable after the flame is extinguished, wherein the burning loss degree is (mass before burning-mass after burning)/mass before burning multiplied by 100%, detecting the influence of the mass ratio of hexaphenoxycyclotriphosphazene and cellulose xanthate solution in the modified viscose on the performance of the cable, and testing the results as shown in Table 7.
TABLE 7 test results of the effect of hexaphenoxycyclotriphosphazene and cellulose xanthate solution quality ratio on cable performance
It can be seen from the data in table 7 that when the mass ratio of the hexaphenoxycyclotriphosphazene to the cellulose xanthate solution is 1:3.8 in the comparative example 5, the cable has longer combustion time, larger combustion degree, higher tensile strength, smaller elongation at break, more haloid gas content, larger toxicity index, oxygen index of more than 40, lower pH value of the discharged gas, lower volume resistivity at 20 ℃, and when the mass ratio of the hexaphenoxycyclotriphosphazene to the cellulose xanthate solution is 1:4.2 in the example 25, the combustion time is reduced, and other detection data are greatly changed, so that when the mass ratio of the hexaphenoxycyclotriphosphazene to the cellulose xanthate solution is 1:4-5, the high-flame-retardant, low-smoke and halogen-free cable has good mechanical properties.
The high flame-retardant fire-resistant low-smoke halogen-free cable is prepared according to the raw materials in the examples 1-2, 7, 11, 15 and 7-11, wherein the mass ratio of the modified viscose fiber preparation raw material hexaphenoxycyclotriphosphazene, the stearic acid amide, the polyacrylamide and the cellulose xanthate solution in the fire-resistant layer 12 is 1:0.7:0.7:4.6, compared with the raw materials in the examples 1-2, 7, 15,
The high-flame-retardant fire-resistant low-smoke halogen-free cables prepared from the materials in the examples 11 and 15 and the comparative examples 7 to 11 are subjected to a flame-retardant experiment, and the mechanical properties of the cables are detected according to JBT10707-2007, wherein the flame-retardant experiment is carried out according to the following method: the cable with the length of 15-20cm is vertically placed, the cable is burned for 15s by an experimental burner with the flame height of 125mm and the thermal power of 500W, the burning is stopped for 15s, the burning is repeated for 5 times, the burning time of the residual flame is observed, the burning loss degree is calculated according to the mass of the cable after the flame is extinguished, the burning loss degree is (the mass before burning-the mass after burning)/the mass before burning multiplied by 100 percent, the performance of the cable is detected, and the test result is shown in table 8.
TABLE 8 mechanical testing results of the cables
As can be seen from the data in table 8, the modified viscose fiber is not used in comparative example 7, the burning time is longer, the burning degree is larger, and the difference between the other detection items and the detection data in example 1 is larger, the kevlar fiber is not added in comparative example 8, the burning time is longer, the burning degree is larger, the tensile strength is different from that in example 1, the detection data in the other items are all different from that in example 1, the furan microcapsule, the calcium alginate fiber and the expandable graphite are not added in the insulating layer in comparative examples 9 to 11, the burning time of the cable prepared in comparative examples 9 to 11 is longer, the burning degree is larger, and the performances such as the tensile strength and the elongation at break are different from those in example 1.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A high fire-retardant fire-resistant low smoke and zero halogen cable which is characterized in that: the cable comprises insulating cable cores (1), an oxygen isolation layer (2) coated outside a plurality of mutually twisted insulating cable cores (1), glass fiber cloth (3) coated outside the oxygen isolation layer (2) and a protective layer (4) coated outside the glass fiber cloth (3), wherein a glass fiber tape (21) is filled between the oxygen isolation layer (2) and the insulating cable cores (1);
the insulated wire core (1) comprises a copper wire (11), a fire-resistant layer (12) coated outside the stranded copper wires (11), an insulating layer (13) coated outside the fire-resistant layer (12), and a plurality of layers of mica tapes (14) coated outside the insulating layer (13);
the refractory layer (12) comprises the following components in parts by weight: 55-70 parts of polyethylene resin, 5-15 parts of smoke suppressant, 20-35 parts of modified viscose fiber, 5-15 parts of kevlar fiber, 10-25 parts of mineral flame retardant filler and 10-15 parts of halogen-free intumescent flame retardant;
the insulating layer (13) comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride resin, 15-20 parts of mineral flame-retardant filler, 10-15 parts of furan resin microcapsule, 10-15 parts of expandable graphite and 20-25 parts of calcium alginate fiber;
the preparation method of the modified viscose fiber comprises the following steps: (1) mixing hexaphenoxycyclotriphosphazene, stearic acid amide and polyacrylamide in a mass ratio of 1:0.5-1.1:0.3-0.9, and stirring for 20-30 min; (2) and (2) adding the cellulose xanthate solution into the mixed solution in the step (1), wherein the mass ratio of the hexaphenoxycyclotriphosphazene to the cellulose xanthate solution is 1:4-5, stirring for 10-20min, and spinning after curing for 120min through 100-fold, wherein the coagulation bath used in the spinning process comprises 130g/L sulfuric acid through 120-fold, 250g/L sodium sulfate through 210-fold and 8-10g/L zinc sulfate, and the temperature of the coagulation bath is 40-50 ℃, so as to obtain the modified viscose.
2. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 1, wherein the modified viscose fiber prepared after spinning in the step (2) is cured for 10-15min by using a sodium hydroxide solution with the temperature of 80-90 ℃, the concentration of 1-3g/L and the water bath ratio of 1:5-8 to the modified viscose fiber.
3. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 1, characterized in that: the smoke suppressant comprises the following components in parts by weight: 4-8 parts of magnesium hydroxide, 4-8 parts of aluminum hydroxide and 2-6 parts of ammonium octamolybdate.
4. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 1, characterized in that: the protective layer (4) comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride resin, 5-15 parts of layered silicate nano flame retardant and 5-10 parts of epoxy resin microcapsule.
5. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 1, characterized in that: the oxygen barrier layer (2) comprises the following components in parts by weight: 50-70 parts of polyethylene resin, 5-10 parts of a charring agent and 1-2 parts of polyethylene wax.
6. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 5, characterized in that: the carbon forming agent is one or a mixture of at least two of cellulose and derivatives, sucrose, sorbitol, epoxy resin and phenolic resin.
7. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 1, characterized in that: the mineral flame-retardant filler is one or a combination of montmorillonite, silica micropowder, mica powder and kaolin.
8. The high flame-retardant fire-resistant low-smoke halogen-free cable according to claim 1, characterized in that: the particle size of the expandable graphite is 80-200 meshes, and the expansion ratio is 200-350 mL/g.
9. A method for preparing a high flame retardant fire resistant low smoke zero halogen cable according to any one of claims 1 to 8, characterized in that: the method comprises the following steps: (1) drawing and annealing;
(2) extrusion molding and wrapping of the fire-resistant layer (12): weighing the components of the fire-resistant layer (12) according to the weight parts, adding the components into a stirrer to stir for 20-30 minutes, carrying out melt extrusion, putting the extruded product into a hot press to be pressed and molded, wherein the temperature of the hot press is 270-280 ℃, the pressure is 16-18MPa, and the hot pressing time is 10-20s, pressing the fire-resistant layer (12), and wrapping the fire-resistant layer (12) on the copper wire (11);
(3) extrusion molding of insulating layer (13), lapping: weighing the components of the insulating layer (13) according to the weight parts, adding the components into a stirrer to stir for 20-30min, performing melt extrusion, performing secondary heating on the extruded product at the heating temperature of 100-;
(4) lapping of a mica tape (14): stranding a plurality of copper wires (11) coated with an insulating layer (13), and winding at least two layers of mica tapes (14) outside the insulating layer (13) to form an insulating wire core (1);
(5) separate extrusion molding, the package of oxygen layer (2): weighing the components of the oxygen-barrier layer (2) according to the weight parts, putting the components into a stirrer, stirring for 20-30min, performing melt extrusion, putting the extruded product into a hot press for pressing and molding, wherein the pressing temperature is 260-270 ℃, the pressing pressure is 15-18MPa, and the pressing time is 16-20s, pressing the oxygen-barrier layer (2), wrapping the oxygen-barrier layer (2) outside a plurality of stranded insulating wire cores (1), and filling a glass fiber tape (21) between the insulating wire cores (1) and the oxygen-barrier layer (2);
(6) wrapping of glass fiber cloth (3): glass fiber cloth (3) is wrapped around the periphery of the oxygen isolation layer (2);
(7) extrusion molding of protective layer (4), wrap: weighing the components of the protective layer (4) according to the weight parts, putting the components into a stirrer, stirring for 20-30min, carrying out melt extrusion, putting the extruded product into a press, pressing the product at the temperature of 280 plus 320 ℃, the pressure of 15-20Mpa and the pressing time of 14-16s to obtain the protective layer (4), and wrapping the protective layer (4) on the periphery of the glass fiber cloth (3).
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| CN112562890A (en) * | 2020-12-09 | 2021-03-26 | 浙江中兴电缆有限公司 | Improved generation high fire-retardant structural control fire resisting cable |
| CN112700918B (en) * | 2020-12-21 | 2022-02-15 | 欧耐特线缆集团有限公司 | Cold-proof photovoltaic cable |
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| CN114743733A (en) * | 2022-03-25 | 2022-07-12 | 四川鸿鑫国泰电缆有限责任公司 | Inorganic mineral insulated cable and preparation method thereof |
| CN114773746B (en) * | 2022-03-25 | 2023-05-09 | 四川鸿鑫国泰电缆有限责任公司 | Medium-voltage power cable and preparation method thereof |
| CN114806314B (en) * | 2022-04-27 | 2023-02-03 | 菲沐盛(山西)材料科技有限公司 | P/N/Si/Ca synergistic flame-retardant water-based intumescent flame-retardant coating and preparation method thereof |
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