CN110534248B - Nuclear island fireproof cable - Google Patents

Nuclear island fireproof cable Download PDF

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CN110534248B
CN110534248B CN201910689570.9A CN201910689570A CN110534248B CN 110534248 B CN110534248 B CN 110534248B CN 201910689570 A CN201910689570 A CN 201910689570A CN 110534248 B CN110534248 B CN 110534248B
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parts
carbon black
white carbon
wollastonite
wrapped outside
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CN110534248A (en
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韩俊宝
夏候东
宰学龙
周俊
徐晓丽
朱元忠
陈安鹏
陶恒莹
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Anhui Cable Co Ltd
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Anhui Cable Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K2003/026—Phosphorus
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/322—Ammonium phosphate
    • C08K2003/323—Ammonium polyphosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/016—Additives defined by their aspect ratio
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Abstract

The invention discloses a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber. The nuclear island fireproof cable provided by the invention adopts the ceramic silicon rubber with specific components to prepare the isolation layer, so that the nuclear island fireproof cable is good in flame retardance and excellent in spray prevention performance.

Description

Nuclear island fireproof cable
Technical Field
The invention relates to the technical field of cables, in particular to a fire-proof cable for a nuclear island.
Background
The nuclear power has the characteristics of cleanness, safety, low fuel consumption and the like, and is very suitable for the requirement of power development. Nuclear power generation is a necessary trend for electrical energy sources. However, nuclear power plants have a high risk of fire, and after a fire occurs, not only power is cut off, but also radioactive substances may leak out to cause environmental pollution and casualties. The nuclear island is a general name of a nuclear reactor in a containment vessel of a nuclear power station and various systems related to the reactor, has extremely high requirements on used cables, and has the electrical performance and the mechanical performance of common cables, and must also have flame retardant, radiation resistant and excellent shielding performances.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the nuclear island fireproof cable which is prepared by adopting the ceramic silicon rubber with specific components to prepare the isolation layer, so that the nuclear island fireproof cable is good in flame retardance and excellent in spray prevention performance.
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber.
Preferably, the ceramic silicon rubber comprises the following raw materials in parts by weight: 80-93 parts of silicon rubber, 3-7.5 parts of phenolic resin, 1-5.8 parts of benzoxazine resin, 10-17 parts of white carbon black, 4-8 parts of wollastonite, 17-26 parts of mica, 2-4.5 parts of montmorillonite, 3-8 parts of graphene oxide, 1-4 parts of boron oxide, 1-1.5 parts of vulcanizing agent, 0.6-1.3 parts of silane coupling agent, 5-12 parts of aluminum hypophosphite, 3-8 parts of ammonium polyphosphate, 2-6 parts of microcapsule red phosphorus and 1-1.7 parts of hydroxyl silicone oil.
Preferably, the silicone rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and the weight ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 30-50: 12-32.
Preferably, the white carbon black is modified white carbon black; the modified white carbon black is prepared according to the following process: uniformly mixing cyanuric chloride and acetonitrile, adding pentaerythritol caged phosphate PEPA and triethylamine, adjusting the temperature to 10-13 ℃ under the protection of nitrogen, reacting for 200-300min, then adding eugenol, reacting for 8-10h at 40-50 ℃, and performing post-treatment to obtain a material A; modifying the white carbon black by using a silane coupling agent KH-570 as a modifier to obtain a material B; adding the material A, the material B, styrene and maleic anhydride into toluene, then adding azobisisobutyronitrile, heating to 75-80 ℃ under the protection of nitrogen, reacting for 6-9h, and filtering, washing and drying after the reaction is finished to obtain the modified white carbon black.
Preferably, in the preparation process of the modified white carbon black, the molar ratio of cyanuric chloride to pentaerythritol caged phosphate PEPA to eugenol is 1: 0.6-0.9: 2.2-2.8; the weight of the silane coupling agent KH-570 is 1.8-3.2 wt% of the weight of the white carbon black; the weight ratio of the material A to the material B to the styrene to the maleic anhydride is 4-9: 60-80: 4-8: 1-3.5.
Preferably, the wollastonite is a mixture of ordinary wollastonite and needle-shaped wollastonite, and the weight ratio of the ordinary wollastonite to the needle-shaped wollastonite is 2-9: 1-3.
Preferably, the length-diameter ratio of the ordinary wollastonite is 1 to 4: 1, the length-diameter ratio of the needle-shaped wollastonite is 14-20: 1.
preferably, the vulcanizing agent is one or a mixture of more of vulcanizing agent BIPB, vulcanizing agent BP and vulcanizing agent DCP.
Preferably, the silane coupling agent is a silane coupling agent KH-550.
The ceramic silicon rubber can be prepared by the conventional ceramic silicon rubber preparation process.
According to the nuclear island fireproof cable, the isolation layer prepared from the ceramic silicon rubber with a specific composition is added in the structure, and the nuclear island fireproof cable is sintered into the hard ceramic armored shell after burning for 2-4min under the ablation of flame, so that the hard ceramic armored shell can effectively prevent the flame from continuing to burn and prevent water from permeating, and smoke is completely cut off after being burnt for about 2min, so that the obtained cable is good in flame retardance, meets the fireproof requirement under the spraying condition, prolongs the service life of the cable, and enables the service life of the cable to be not less than 60 years; the specific ceramic silicon rubber material takes silicon rubber as a main material, and is matched with phenolic resin and benzoxazine resin, so that the obtained material has good high-temperature oxidation resistance and excellent flame retardant property, the dosage of the phenolic resin and the benzoxazine resin is controlled, and the mechanical properties such as tensile strength and the like of the material are improved; in the preparation process of the modified white carbon black, cyanuric chloride and pentaerythritol caged phosphate PEPA are used as raw materials, the reaction condition is controlled, one chlorine in the cyanuric chloride reacts with a hydroxyl in the pentaerythritol caged phosphate PEPA, then the cyanuric chloride is mixed with eugenol, the reaction condition is controlled, the residual chlorine in the cyanuric chloride reacts with the hydroxyl of the eugenol, and a material A is obtained; then taking the material A, white carbon black modified by a silane coupling agent KH-570, styrene and maleic anhydride as raw materials, the polymerization reaction is carried out under the action of azodiisobutyronitrile, so that the material A, the styrene and the maleic anhydride are introduced to the surface of the white carbon black, the white carbon black is coated to obtain the modified white carbon black, the modified white carbon black is added into a system, agglomeration does not occur in the system, on one hand, has synergistic effect with aluminum hypophosphite, ammonium polyphosphate, microcapsule red phosphorus, montmorillonite and graphene oxide, can capture free radicals in a flame region during combustion so as to inhibit gas phase combustion, meanwhile, substances such as phosphoric acid, polyphosphoric acid, nitrogen and the like can be formed, a catalytic system forms carbon, a compact interlayer is formed to isolate the exchange of oxygen and combustible gas and the transfer of heat, meanwhile, oxygen in a combustion area is diluted, and the effects in multiple aspects are cooperated, so that the system is endowed with excellent flame retardance; on the other hand, the structure of the phenolic resin has the advantages that the styrene is introduced, the styrene has good compatibility with the silicon rubber, and simultaneously, the introduced maleic anhydride can act with hydroxyl in the phenolic resin, so that the compatibility of the phenolic resin and the silicon rubber is improved, and the phenolic resin and the silicon rubber can play an excellent synergistic effect; montmorillonite and graphene oxide are added into silicon rubber, and the nano-sheet layer of the montmorillonite and the graphene oxide has a composite phenomenon, so that the tensile strength of the material is obviously improved, the obtained carbon layer structure is more compact, and the oxygen index of the material is improved; wollastonite and mica are specifically selected as porcelain forming fillers, boron oxide and aluminum hypophosphite are added as cosolvents, the materials are uniformly dispersed in a system under the action of a silane coupling agent, the boundary with a matrix is fuzzy, the dispersibility and the wettability are good, the porcelain forming temperature is low, and a continuous and compact ceramic-like substance is formed under high-temperature ablation, so that the obtained material has high flame retardance and thermal stability.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber.
Example 2
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber;
the ceramic silicon rubber comprises the following raw materials in parts by weight: 93 parts of silicon rubber, 3 parts of phenolic resin, 5.8 parts of benzoxazine resin, 10 parts of white carbon black, 8 parts of wollastonite, 17 parts of mica, 4.5 parts of montmorillonite, 3 parts of graphene oxide, 4 parts of boron oxide, 1 part of vulcanizing agent, 1.3 parts of silane coupling agent, 5 parts of aluminum hypophosphite, 8 parts of ammonium polyphosphate, 2 parts of microcapsule red phosphorus and 1.7 parts of hydroxyl silicone oil.
Example 3
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber;
the ceramic silicon rubber comprises the following raw materials in parts by weight: 64.5 parts of methyl vinyl silicone rubber, 15.5 parts of methyl phenyl vinyl silicone rubber, 7.5 parts of phenolic resin, 1 part of benzoxazine resin, 17 parts of white carbon black, 1.6 parts of common wollastonite, 2.4 parts of needle-shaped wollastonite, 26 parts of mica, 2 parts of montmorillonite, 8 parts of graphene oxide, 1 part of boron oxide, 1.5 parts of vulcanizing agent BIPB, KH-5500.6 parts of silane coupling agent, 12 parts of aluminum hypophosphite, 3 parts of ammonium polyphosphate, 6 parts of microcapsule red phosphorus and 1 part of hydroxyl silicone oil;
the white carbon black is modified white carbon black; the modified white carbon black is prepared according to the following process: uniformly mixing cyanuric chloride and acetonitrile, adding pentaerythritol caged phosphate PEPA and triethylamine, adjusting the temperature to 10 ℃ under the protection of nitrogen, reacting for 300min, then adding eugenol, reacting for 10h at 40 ℃, and performing post-treatment to obtain a material A, wherein the molar ratio of cyanuric chloride to pentaerythritol caged phosphate PEPA to eugenol is 1: 0.6: 2.8 of; modifying white carbon black by using a silane coupling agent KH-570 as a modifier to obtain a material B, wherein the weight of the silane coupling agent KH-570 is 1.8 wt% of the weight of the white carbon black; adding a material A, a material B, styrene and maleic anhydride into toluene, wherein the weight ratio of the material A to the material B to the styrene to the maleic anhydride is 9: 60: 8: 1, adding azobisisobutyronitrile, heating to 75 ℃ under the protection of nitrogen, reacting for 9 hours, and filtering, washing and drying after the reaction to obtain the modified white carbon black;
the length-diameter ratio of the common wollastonite is 1: 1, the length-diameter ratio of the needle-shaped wollastonite is 20: 1.
example 4
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber;
the ceramic silicon rubber comprises the following raw materials in parts by weight: 90 parts of silicon rubber, 4 parts of phenolic resin, 5 parts of benzoxazine resin, 12 parts of white carbon black, 7.3 parts of wollastonite, 19 parts of mica, 4 parts of montmorillonite, 4.2 parts of graphene oxide, 3.3 parts of boron oxide, 1.1 parts of vulcanizing agent BP, KH-5501 parts of silane coupling agent, 7 parts of aluminum hypophosphite, 7 parts of ammonium polyphosphate, 5 parts of microcapsule red phosphorus and 1.6 parts of hydroxyl silicone oil;
the silicone rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and the weight ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 30: 32, a first step of removing the first layer;
the white carbon black is modified white carbon black; the modified white carbon black is prepared according to the following process: uniformly mixing cyanuric chloride and acetonitrile, adding pentaerythritol caged phosphate PEPA and triethylamine, adjusting the temperature to 13 ℃ under the protection of nitrogen, reacting for 200min, adding eugenol, reacting for 8h at 50 ℃, and performing aftertreatment to obtain a material A; modifying the white carbon black by using a silane coupling agent KH-570 as a modifier to obtain a material B; adding a material A, a material B, styrene and maleic anhydride into toluene, then adding azobisisobutyronitrile, heating to 80 ℃ under the protection of nitrogen, reacting for 6 hours, and filtering, washing and drying after the reaction is finished to obtain the modified white carbon black; wherein the molar ratio of cyanuric chloride to pentaerythritol caged phosphate PEPA to eugenol is 1: 0.9: 2.2; the weight of the silane coupling agent KH-570 is 3.2 wt% of the weight of the white carbon black; the weight ratio of the material A to the material B to the styrene to the maleic anhydride is 4: 80: 4: 3.5;
the wollastonite is a mixture of common wollastonite and needle-shaped wollastonite, and the weight ratio of the common wollastonite to the needle-shaped wollastonite is 9: 1; the length-diameter ratio of the common wollastonite is 4: 1, the length-diameter ratio of the needle-shaped wollastonite is 14: 1.
example 5
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber;
the ceramic silicon rubber comprises the following raw materials in parts by weight: 83 parts of silicon rubber, 7 parts of phenolic resin, 1.6 parts of benzoxazine resin, 16 parts of white carbon black, 5 parts of wollastonite, 24 parts of mica, 2.7 parts of montmorillonite, 7.3 parts of graphene oxide, 1.6 parts of boron oxide, 0.3 part of vulcanizing agent BIPB, 0.5 part of vulcanizing agent BP, 0.6 part of vulcanizing agent DCP, KH-5500.7 parts of silane coupling agent, 11 parts of aluminum hypophosphite, 4 parts of ammonium polyphosphate, 3 parts of microcapsule red phosphorus and 1.3 parts of hydroxyl silicone oil;
the silicone rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and the weight ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 42: 17;
the white carbon black is modified white carbon black; the modified white carbon black is prepared according to the following process: uniformly mixing cyanuric chloride and acetonitrile, adding pentaerythritol caged phosphate PEPA and triethylamine, adjusting the temperature to 12 ℃ under the protection of nitrogen, reacting for 260min, then adding eugenol, reacting for 9h at 47 ℃, and performing post-treatment to obtain a material A; modifying the white carbon black by using a silane coupling agent KH-570 as a modifier to obtain a material B; adding a material A, a material B, styrene and maleic anhydride into toluene, then adding azobisisobutyronitrile, heating to 77 ℃ under the protection of nitrogen, reacting for 7 hours, and filtering, washing and drying after the reaction is finished to obtain the modified white carbon black; wherein the molar ratio of cyanuric chloride to pentaerythritol caged phosphate PEPA to eugenol is 1: 0.7: 2.6; the weight of the silane coupling agent KH-570 is 3 wt% of the weight of the white carbon black; the weight ratio of the material A to the material B to the styrene to the maleic anhydride is 6: 69: 7: 1.9;
the wollastonite is a mixture of common wollastonite and needle-shaped wollastonite, and the weight ratio of the common wollastonite to the needle-shaped wollastonite is 6: 2.1; the length-diameter ratio of the common wollastonite is 3: 1, the length-diameter ratio of the needle-shaped wollastonite is 18: 1.
example 6
The invention provides a fire-proof cable for a nuclear island, which comprises a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer, wherein the fire-resistant layer is wrapped outside the conductor; the isolation layer is prepared from ceramic silicon rubber;
the ceramic silicon rubber comprises the following raw materials in parts by weight: 88 parts of silicon rubber, 6 parts of phenolic resin, 2 parts of benzoxazine resin, 14 parts of white carbon black, 6.2 parts of wollastonite, 19 parts of mica, 3.2 parts of montmorillonite, 5 parts of graphene oxide, 2.7 parts of boron oxide, 1 part of vulcanizing agent BIPB, 0.3 part of vulcanizing agent DCP, KH-5501 parts of silane coupling agent, 9 parts of aluminum hypophosphite, 5 parts of ammonium polyphosphate, 3.8 parts of microcapsule red phosphorus and 1.3 parts of hydroxyl silicone oil;
the silicone rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and the weight ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 43: 17;
the white carbon black is modified white carbon black; the modified white carbon black is prepared according to the following process: uniformly mixing cyanuric chloride and acetonitrile, adding pentaerythritol caged phosphate PEPA and triethylamine, adjusting the temperature to 11 ℃ under the protection of nitrogen, reacting for 280min, then adding eugenol, reacting for 8.5h at 49 ℃, and performing post-treatment to obtain a material A; modifying the white carbon black by using a silane coupling agent KH-570 as a modifier to obtain a material B; adding a material A, a material B, styrene and maleic anhydride into toluene, then adding azobisisobutyronitrile, heating to 79 ℃ under the protection of nitrogen, reacting for 7 hours, and filtering, washing and drying after the reaction is finished to obtain the modified white carbon black; wherein the molar ratio of cyanuric chloride to pentaerythritol caged phosphate PEPA to eugenol is 1: 0.66: 2.6; the weight of the silane coupling agent KH-570 is 2.1 wt% of the weight of the white carbon black; the weight ratio of the material A to the material B to the styrene to the maleic anhydride is 7: 72: 5: 1.9;
the wollastonite is a mixture of common wollastonite and needle-shaped wollastonite, and the weight ratio of the common wollastonite to the needle-shaped wollastonite is 7: 2; the length-diameter ratio of the common wollastonite is 2: 1, the length-diameter ratio of the needle-shaped wollastonite is 18: 1.
example 7
The only difference from example 6 is that: in the raw materials of the ceramic silicon rubber, the white carbon black is unmodified common white carbon black.
Comparative example 1
The only difference from example 6 is that: the raw materials of the ceramic silicon rubber do not contain phenolic resin and benzoxazine resin.
Comparative example 2
The only difference from example 6 is that: the raw material of the ceramic silicon rubber does not contain graphene oxide.
The properties of the ceramic silicone rubbers of inventive example 2, example 6, example 7, comparative example 1 and comparative example 2 were examined: wherein, the tensile strength and the elongation at break are measured according to GB/T1040-; measuring the oxygen index of the sample according to GB/T2406-93 oxygen index method for testing the combustion performance of plastics; the results are shown in the following table:
example 2 Example 6 Example 7 Comparative example 1 Comparative example 2
Tensile strength/MPa 11.3 12.9 11.5 10.2 10.7
Elongation at break/% 265 310 298 260 273
Oxygen index/% 37 39.9 38.3 36.3 35.4
The performance of the cable is detected, and the electrical property of the obtained cable meets the requirement that the cable is not broken down at 3.5KV/5 min; the finished cable single vertical combustion test meets the regulation of IEC 60332-1-2 standard; the flame retardant property meets the requirements of a vertical bundled combustion test, and the maximum carbonization height above the bottom edge of the blast burner is not more than 0.9 m; performing a fire-resistant cable test according to GB/T19216-2008 and performing a fire-resistant cable test with spraying according to BS6387-2013, wherein the cable keeps the integrity of a line, the 2A fuse is continuous, and the indicator light is not extinguished; the minimum light transmittance of the smoke emission test is more than 85 percent; when all the components of the cable are burnt, the release amount of halogen acid gas and the PH value both meet the national standard requirements.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. A fire-proof cable for a nuclear island is characterized by comprising a conductor, a fire-resistant layer wrapped outside the conductor, an insulating layer wrapped outside the fire-resistant layer, an isolating layer wrapped outside the insulating layer and a sheath layer wrapped outside the isolating layer; the isolation layer is prepared from ceramic silicon rubber;
the ceramic silicon rubber comprises the following raw materials in parts by weight: 80-93 parts of silicon rubber, 3-7.5 parts of phenolic resin, 1-5.8 parts of benzoxazine resin, 10-17 parts of white carbon black, 4-8 parts of wollastonite, 17-26 parts of mica, 2-4.5 parts of montmorillonite, 3-8 parts of graphene oxide, 1-4 parts of boron oxide, 1-1.5 parts of vulcanizing agent, 0.6-1.3 parts of silane coupling agent, 5-12 parts of aluminum hypophosphite, 3-8 parts of ammonium polyphosphate, 2-6 parts of microcapsule red phosphorus and 1-1.7 parts of hydroxyl silicone oil;
wherein the white carbon black is modified white carbon black; the modified white carbon black is prepared according to the following process: uniformly mixing cyanuric chloride and acetonitrile, adding pentaerythritol caged phosphate PEPA and triethylamine, adjusting the temperature to 10-13 ℃ under the protection of nitrogen, reacting for 200-300min, then adding eugenol, reacting for 8-10h at 40-50 ℃, and performing post-treatment to obtain a material A; modifying the white carbon black by using a silane coupling agent KH-570 as a modifier to obtain a material B; adding the material A, the material B, styrene and maleic anhydride into toluene, then adding azobisisobutyronitrile, heating to 75-80 ℃ under the protection of nitrogen, reacting for 6-9h, and filtering, washing and drying after the reaction is finished to obtain the modified white carbon black.
2. The nuclear island fireproof cable according to claim 1, wherein the silicone rubber is a mixture of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber, and the weight ratio of the methyl vinyl silicone rubber to the methyl phenyl vinyl silicone rubber is 30-50: 12-32.
3. The nuclear island fireproof cable according to claim 1, wherein in the preparation process of the modified white carbon black, the molar ratio of cyanuric chloride to pentaerythritol caged phosphate PEPA to eugenol is 1: 0.6-0.9: 2.2-2.8; the weight of the silane coupling agent KH-570 is 1.8-3.2 wt% of the weight of the white carbon black; the weight ratio of the material A to the material B to the styrene to the maleic anhydride is 4-9: 60-80: 4-8: 1-3.5.
4. The nuclear island fireproof cable of claim 1 or 2, wherein the wollastonite is a mixture of ordinary wollastonite and needle-like wollastonite, and the weight ratio of the ordinary wollastonite to the needle-like wollastonite is 2-9: 1-3.
5. The nuclear island fireproof cable of claim 4, wherein the length-diameter ratio of the wollastonite is 1-4: 1, the length-diameter ratio of the needle-shaped wollastonite is 14-20: 1.
6. the nuclear island fireproof cable of claim 1 or 2, wherein the vulcanizing agent is a mixture of one or more of vulcanizing agent BIPB, vulcanizing agent BP and vulcanizing agent DCP.
7. The nuclear island fireproof cable of claim 1 or 2, wherein the silane coupling agent is a silane coupling agent KH-550.
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CN111415776A (en) * 2020-02-20 2020-07-14 江苏浦漕科技股份有限公司 Soft mineral insulation fireproof cable
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CN109021576A (en) * 2018-08-20 2018-12-18 镇江创达新材料科技有限公司 A kind of preparation method of the Flame-retardant ceramic silicone rubber for safety cable

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