CN116285047A - Mineral insulating material for fireproof cable and preparation method - Google Patents
Mineral insulating material for fireproof cable and preparation method Download PDFInfo
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- CN116285047A CN116285047A CN202310302771.5A CN202310302771A CN116285047A CN 116285047 A CN116285047 A CN 116285047A CN 202310302771 A CN202310302771 A CN 202310302771A CN 116285047 A CN116285047 A CN 116285047A
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- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 48
- 239000011707 mineral Substances 0.000 title claims abstract description 48
- 239000011810 insulating material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims description 13
- 229920001577 copolymer Polymers 0.000 claims abstract description 38
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 22
- -1 ethylene-chlorotrifluoroethylene Chemical group 0.000 claims abstract description 19
- 239000004014 plasticizer Substances 0.000 claims abstract description 12
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 9
- 239000003063 flame retardant Substances 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 19
- 230000009970 fire resistant effect Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 8
- 239000012774 insulation material Substances 0.000 claims description 8
- 238000013329 compounding Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 239000000378 calcium silicate Substances 0.000 claims description 4
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 4
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 4
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000391 magnesium silicate Substances 0.000 claims description 4
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 4
- 235000019792 magnesium silicate Nutrition 0.000 claims description 4
- 239000012757 flame retardant agent Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 10
- 229920001780 ECTFE Polymers 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 4
- 229920000642 polymer Polymers 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 10
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 10
- 229920002545 silicone oil Polymers 0.000 description 9
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 7
- 239000000347 magnesium hydroxide Substances 0.000 description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- 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
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention provides a mineral insulating material for a fireproof cable, which comprises the following components in parts by weight: 35-45 parts of matrix material, 17-24 parts of mineral silicate, 12-30 parts of filler, 6-18 parts of flame retardant, 10-22 parts of plasticizer and 8-10 parts of auxiliary agent; the modified chlorotrifluoroethylene copolymer is adopted as a matrix material, and the chlorotrifluoroethylene copolymers with different molecular weights are mixed and compounded at high temperature, so that the impact strength of a blending system is improved, and the high-temperature stress cracking property of a matrix is further effectively improved; the plasticizer graphite can improve the extrusion performance of the insulating material, and an expansion layer is produced to cover the surface of the polymer, so that the flame retardant property of the insulating material is improved; compared with the existing ethylene-chlorotrifluoroethylene copolymer insulating fireproof cable, the cable obviously improves the high-temperature stress cracking property, is safe and reliable, and ensures the fire safety of the building.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a mineral insulating material for a fireproof cable and a preparation method thereof.
Background
In the development process of the fireproof cable, a fireproof cable and a mineral insulation cable are sequentially arranged, wherein the fireproof cable comprises a polyvinyl chloride insulation cable, a crosslinked polyethylene insulation cable and a silicone rubber insulation cable, and the fireproof cable is divided into a rigid mineral insulation cable and a flexible fireproof cable; although the fire-resistant cable has better flame retardance, the polyvinyl chloride insulated cable can release gas harmful to human bodies when burning, and a great amount of smoke is accompanied, so that the fire-resistant cable has serious threat to human life when being in fire; the crosslinked polyethylene insulated cable is mostly applied to the tail end of a line, but has poor heat-resistant adhesion; the silicon rubber insulated cable is poor in tearing resistance.
The existing use examples of the mineral insulated cable are basically mature, but the structure, the process and the constituent materials of the product still have a plurality of defects and shortcomings, which affect the large-scale use of the mineral insulated cable (research and application of novel composite insulated flexible cable Liu Yun). The insulating material of the fireproof cable is selected, so that the performances of the fireproof cable in fire resistance, electricity and the like are related; at present, most of insulating layer materials of the mineral insulating fireproof cable are magnesia powder, however, single magnesia powder also has the problem of reduced insulating property caused by strong water absorption, and has poor uniformity and formability; although there are insulating materials for modifying magnesium oxide, there are problems of easy deformation and high cost.
Patent publication number CN108329565a discloses an insulating material for cables, a flexible mineral insulated fireproof cable, but the cost of using chloroplatinic acid is high; the existing fireproof cable uses ethylene-chlorotrifluoroethylene copolymer as an insulating material, has better fireproof heat resistance, but is easy to generate stress cracking at 120-150 ℃ and greatly limits the use effect.
Disclosure of Invention
In view of the above, the invention provides a mineral insulating material for a fireproof cable, which solves the technical problems of stress cracking and low service performance of the traditional material chlorotrifluoroethylene copolymer at high temperature.
The technical scheme of the invention is realized as follows:
in one aspect, the invention provides a mineral insulating material for a fireproof cable, which comprises the following components in parts by weight: 35-45 parts of matrix material, 17-24 parts of mineral silicate, 12-30 parts of filler, 6-18 parts of flame retardant, 10-22 parts of plasticizer and 8-10 parts of auxiliary agent.
In order to improve the problem of stress cracking of the chlorotrifluoroethylene copolymer at high temperatures, it is further preferred that the matrix material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber.
Further preferably, the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1: (1.1-1.4).
Further preferably, the preparation process of the modified chlorotrifluoroethylene copolymer comprises the following steps:
s1, respectively taking polytrifluoroethylene A and polytrifluoroethylene B with different mass fractions, compounding into a mixture, drying at 65-70 ℃ for 6-8h, and then melting and mixing at 250-270 ℃ for 9-12min;
s2, pressing the mixture obtained after the melt mixing in the step S1 for 8-10min at the temperature of 250-270 ℃ and the pressure of 10-20MPa, and obtaining the modified chlorotrifluoroethylene copolymer.
In order to study the molecular chain movement ability and elastic behavior of the chlorotrifluoroethylene copolymer blend system in different molecular weights, it is further preferred that the mass fraction of chlorotrifluoroethylene A in step S1 is 5-10% and the mass fraction of B is 20-30%.
The extrusion performance and flame retardant performance of the insulation material are improved by introducing a plasticizer, and for this purpose, it is further preferable that the plasticizer includes one of graphite, triethylamine or ethylene glycol.
Further preferably, the mineral silicate comprises an aluminosilicate, magnesium silicate or calcium silicate.
Further preferably, the filler comprises fluorophlogopite powder or glass powder.
Further preferably, the particle size of the fluorophlogopite powder is 0.002-0.04mm.
Further preferably, the flame retardant comprises magnesium hydroxide, aluminum hydroxide or magnesium carbonate.
Further preferably, the auxiliary comprises silicone oil or PE wax.
In another aspect, the present invention also provides a method for preparing the mineral insulating material for a fireproof cable according to the first aspect, including the following steps:
adding the matrix material, mineral silicate, filler, flame retardant, plasticizer and auxiliary agent into an internal mixer, and mixing for 0.5-1h at 110-120 ℃ and 16-20 MPa.
Compared with the prior art, the mineral insulating material for the fireproof cable and the preparation method thereof have the following beneficial effects:
(1) Compared with the existing insulating materials such as ethylene-chlorotrifluoroethylene copolymer, the flame retardant property is better, but high-temperature stress cracking is easy to occur, and the mechanical property is poorer; according to the invention, the modified chlorotrifluoroethylene copolymer is used as a matrix material, wherein chlorotrifluoroethylene copolymers with different molecular weights are mixed and compounded at high temperature, the movement capability of a blend molecular chain is reduced, the molecular chain is prevented from extruding into a crystal lattice, the crystallinity and the size are reduced, the impact strength of a blending system is further improved, and the high-temperature stress cracking property of a matrix can be effectively improved by matching with styrene-butadiene rubber without adding other modifiers;
(2) According to the invention, the plasticizer is introduced into the insulating material, so that the extrusion performance of the insulating material can be improved, an expansion layer is generated to cover the surface of the polymer, and the flame retardant property of the insulating material is improved;
(3) The mineral insulating material is used for preparing the fireproof cable, obviously improves the high-temperature stress cracking property, is safe and reliable and improves the fire safety guarantee of a building on the premise of ensuring good fireproof and insulating properties.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
A mineral insulating material for a fire-resistant cable, comprising the following components: 3.5kg of a base material, 1.7kg of an aluminosilicate, 1.2kg of fluorophlogopite powder having a particle diameter of 0.002mm, 0.6kg of magnesium hydroxide, 1kg of graphite and 0.8kg of a silicone oil.
The matrix material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber, and the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1:1.1.
wherein the preparation process of the modified chlorotrifluoroethylene copolymer comprises the following steps:
s1, respectively taking 5% of poly (chlorotrifluoroethylene) A and 20% of poly (chlorotrifluoroethylene) B by mass fraction, compounding into a mixture, drying at 65 ℃ for 6 hours, and then melting and mixing at 250 ℃ for 9 minutes;
s2, pressing the mixture obtained after the melt mixing in the step S1 for 8min at the temperature of 250 ℃ and the pressure of 10MPa, and obtaining the modified chlorotrifluoroethylene copolymer.
A method for preparing a mineral insulating material for a fire-resistant cable, comprising the steps of:
adding the matrix material, aluminosilicate, fluorophlogopite powder, magnesium hydroxide, graphite and silicone oil into an internal mixer, and mixing for 0.5h at 110 ℃ and 16 MPa.
Example 2
A mineral insulating material for a fire-resistant cable, comprising the following components: 4.5kg of a base material, 2.4kg of an aluminosilicate, 3kg of fluorophlogopite powder having a particle diameter of 0.002mm, 1.8kg of magnesium hydroxide, 2.2kg of graphite and 1kg of silicone oil.
The matrix material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber, and the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1:1.1.
wherein the preparation process of the modified chlorotrifluoroethylene copolymer comprises the following steps:
s1, respectively taking 10% of poly (chlorotrifluoroethylene) A and 30% of poly (chlorotrifluoroethylene) B by mass fraction, compounding into a mixture, drying at 65 ℃ for 6 hours, and then melting and mixing at 250 ℃ for 9 minutes;
s2, pressing the mixture obtained after the melt mixing in the step S1 for 8min at the temperature of 250 ℃ and the pressure of 10MPa, and obtaining the modified chlorotrifluoroethylene copolymer.
A method for preparing a mineral insulating material for a fire-resistant cable, comprising the steps of:
adding the matrix material, aluminosilicate, fluorophlogopite powder, magnesium hydroxide, graphite and silicone oil into an internal mixer, and mixing for 0.5h at 110 ℃ and 16 MPa.
Example 3
A mineral insulating material for a fire-resistant cable, comprising the following components: 4kg of a base material, 2kg of magnesium silicate, 2.4kg of fluorophlogopite powder with a particle size of 0.04mm, 1.2kg of aluminum hydroxide, 1.8kg of triethylamine and 0.9kg of PE wax.
The matrix material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber, and the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1:1.4.
wherein the preparation process of the modified chlorotrifluoroethylene copolymer comprises the following steps:
s1, respectively taking 8% of poly (chlorotrifluoroethylene) A and 24% of poly (chlorotrifluoroethylene) B by mass fraction, compounding into a mixture, drying at 70 ℃ for 8 hours, and then melting and mixing at 270 ℃ for 12 minutes;
s2, pressing the mixture obtained after the melt mixing in the step S1 at 270 ℃ and 20MPa for 10min to obtain the modified chlorotrifluoroethylene copolymer.
A method for preparing a mineral insulating material for a fire-resistant cable, comprising the steps of:
adding the matrix material, magnesium silicate, fluorophlogopite powder, aluminum hydroxide, triethylamine and PE wax into an internal mixer, and mixing for 1h at 120 ℃ and 20 MPa.
Example 4
A mineral insulating material for a fire-resistant cable, comprising the following components: 3.5kg of a base material, 1.7kg of a calcium silicate, 1.2kg of fluorophlogopite powder having a particle diameter of 0.02mm, 0.6kg of magnesium carbonate, 1kg of ethylene glycol and 0.8kg of silicone oil.
The matrix material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber, and the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1:1.3.
wherein the preparation process of the modified chlorotrifluoroethylene copolymer comprises the following steps:
s1, respectively taking 5% of poly (chlorotrifluoroethylene) A and 20% of poly (chlorotrifluoroethylene) B by mass fraction, compounding into a mixture, drying at 65 ℃ for 6 hours, and then melting and mixing at 250 ℃ for 9 minutes;
s2, pressing the mixture obtained after the melt mixing in the step S1 for 8min at the temperature of 250 ℃ and the pressure of 10MPa, and obtaining the modified chlorotrifluoroethylene copolymer.
A method for preparing a mineral insulating material for a fire-resistant cable, comprising the steps of:
adding the matrix material, calcium silicate, fluorophlogopite powder, magnesium carbonate, ethylene glycol and silicone oil into an internal mixer, and mixing for 1h at 120 ℃ and 20 MPa.
Example 5
A mineral insulating material for a fire-resistant cable, comprising the following components: 3.5kg of matrix material, 1.7kg of aluminosilicate, 1.2kg of glass frit, 0.6kg of magnesium hydroxide, 1kg of graphite and 0.8kg of silicone oil.
The matrix material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber, and the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1:1.1.
wherein the preparation process of the modified chlorotrifluoroethylene copolymer comprises the following steps:
s1, respectively taking 5% of poly (chlorotrifluoroethylene) A and 20% of poly (chlorotrifluoroethylene) B by mass fraction, compounding into a mixture, drying at 68 ℃ for 7h, and then melting and mixing at 260 ℃ for 10min;
s2, pressing the mixture obtained after the melt mixing in the step S1 for 9min at 260 ℃ and 15MPa to obtain the modified chlorotrifluoroethylene copolymer.
A method for preparing a mineral insulating material for a fire-resistant cable, comprising the steps of:
the base material, aluminosilicate, glass powder, magnesium hydroxide, graphite and silicone oil are added into an internal mixer to be mixed for 0.8h at 115 ℃ and 18 MPa.
Comparative example 1
A mineral insulation material for a fire-proof cable differs from example 1 in that an ethylene-chlorotrifluoroethylene copolymer is used as the matrix material.
Comparative example 2
A mineral insulation material for a fire-resistant cable differs from example 2 in that no plasticizer is introduced.
Comparative example 3
A mineral insulation material for a fire-proof cable differs from example 3 in that the matrix material is selected from acetic acid-vinyl acetate copolymer.
Comparative example 4
A mineral insulation for a fire-resistant cable differs from example 4 in that no filler is added.
Comparative example 5
A mineral insulating material for fireproof cables, prepared by a preparation method of patent publication No. CN 108329565A.
Performance test
The performance of each embodiment was tested with reference to the standards of GB/T3048-2007 and BS 6387.
Table 1 service performance test
From the above, the comparison of the embodiment 1 and the comparative embodiment 1, and the comparison of the embodiment 3 and the comparative embodiment 3, the modified chlorotrifluoroethylene copolymer is adopted as the matrix material, and the chlorotrifluoroethylene copolymers with different molecular weights are mixed and compounded at high temperature, so that the high-temperature stress cracking property of the matrix is effectively improved, and the normal operation of the cable at high temperature is ensured; compared with the comparative example 2, the extrusion performance of the insulating material is improved after the plasticizer is introduced, the expansion layer is produced to cover the surface of the polymer, and the flame retardant property is better improved; compared with the comparative example 4, the high temperature resistance of the insulating material is improved after the fluorophlogopite powder or the glass powder is added as the filler, and the insulating material has higher resistivity; compared with the prior flexible mineral insulated fireproof cable, the embodiment 5 and the comparative example 5 have obviously improved high-temperature stress cracking property, flame retardance and resistivity, and are suitable for explosion prevention, fire prevention and high-temperature occasions.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A mineral insulating material for a fireproof cable, characterized by comprising the following components in parts by weight: 35-45 parts of matrix material, 17-24 parts of mineral silicate, 12-30 parts of filler, 6-18 parts of flame retardant, 10-22 parts of plasticizer and 8-10 parts of auxiliary agent.
2. The mineral insulation material for a fireproof cable according to claim 1, wherein the base material comprises a modified chlorotrifluoroethylene copolymer and styrene-butadiene rubber.
3. The mineral insulation for a fireproof cable according to claim 2, wherein the molar ratio of the modified chlorotrifluoroethylene copolymer to the styrene-butadiene rubber is 1: (1.1-1.4).
4. The mineral insulation for a fire-resistant cable according to claim 2, wherein the preparation process of the modified chlorotrifluoroethylene copolymer comprises the steps of:
s1, respectively taking polytrifluoroethylene A and polytrifluoroethylene B with different mass fractions, compounding into a mixture, drying at 65-70 ℃ for 6-8h, and then melting and mixing at 250-270 ℃ for 9-12min;
s2, pressing the mixture obtained after the melt mixing in the step S1 for 8-10min at the temperature of 250-270 ℃ and the pressure of 10-20MPa, and obtaining the modified chlorotrifluoroethylene copolymer.
5. The mineral insulation for a fireproof cable according to claim 4, wherein the mass fraction of the polytrifluoroethylene a in the step S1 is 5 to 10% and the mass fraction of the B is 20 to 30%.
6. The mineral insulation material for a fire-resistant cable according to claim 1, wherein the plasticizer comprises graphite, triethylamine or ethylene glycol.
7. The mineral insulating material for a fire-resistant cable according to claim 1, wherein the mineral silicate comprises aluminosilicate, magnesium silicate or calcium silicate.
8. The mineral insulating material for a fireproof cable according to claim 1, wherein the filler comprises fluorophlogopite powder or glass powder.
9. The mineral insulation material for a fireproof cable according to claim 8, wherein the particle size of the fluorophlogopite powder is 0.002-0.04mm.
10. A method for the preparation of a mineral insulation material for a fire-resistant cable according to any one of claims 1 to 9, comprising the steps of:
adding the matrix material, mineral silicate, filler, flame retardant, plasticizer and auxiliary agent into an internal mixer, and mixing for 0.5-1h at 110-120 ℃ and 16-20 MPa.
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|---|---|---|---|
| CN202310302771.5A CN116285047A (en) | 2023-03-27 | 2023-03-27 | Mineral insulating material for fireproof cable and preparation method |
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| CN202310302771.5A CN116285047A (en) | 2023-03-27 | 2023-03-27 | Mineral insulating material for fireproof cable and preparation method |
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