CN114709016A - Safety cable suitable for building - Google Patents
Safety cable suitable for building Download PDFInfo
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- CN114709016A CN114709016A CN202210427282.8A CN202210427282A CN114709016A CN 114709016 A CN114709016 A CN 114709016A CN 202210427282 A CN202210427282 A CN 202210427282A CN 114709016 A CN114709016 A CN 114709016A
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- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 118
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 118
- 239000003063 flame retardant Substances 0.000 claims abstract description 106
- 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 93
- 239000004744 fabric Substances 0.000 claims abstract description 76
- 238000005253 cladding Methods 0.000 claims abstract description 44
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 35
- 229920002972 Acrylic fiber Polymers 0.000 claims abstract description 27
- 239000003607 modifier Substances 0.000 claims description 100
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 55
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims description 16
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 14
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000005416 organic matter Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 34
- 230000008569 process Effects 0.000 abstract description 29
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 150
- 230000000052 comparative effect Effects 0.000 description 69
- 230000000694 effects Effects 0.000 description 19
- 238000012360 testing method Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 12
- 238000012986 modification Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 229920000742 Cotton Polymers 0.000 description 8
- KUKFKAPJCRZILJ-UHFFFAOYSA-N prop-2-enenitrile;prop-2-enoic acid Chemical compound C=CC#N.OC(=O)C=C KUKFKAPJCRZILJ-UHFFFAOYSA-N 0.000 description 8
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 8
- 239000004020 conductor Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 239000000806 elastomer Substances 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 229920005698 acrylonitrile and acrylic acid copolymer Polymers 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000012796 inorganic flame retardant Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- HGINCPLSRVDWNT-UHFFFAOYSA-N acrylaldehyde Natural products C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- HTKFORQRBXIQHD-UHFFFAOYSA-N allylthiourea Chemical compound NC(=S)NCC=C HTKFORQRBXIQHD-UHFFFAOYSA-N 0.000 description 1
- 229960001748 allylthiourea Drugs 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000004786 cone calorimetry Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- BNKAXGCRDYRABM-UHFFFAOYSA-N ethenyl dihydrogen phosphate Chemical compound OP(O)(=O)OC=C BNKAXGCRDYRABM-UHFFFAOYSA-N 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000012745 toughening agent Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- 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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- 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
-
- 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
-
- 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
- Compositions Of Macromolecular Compounds (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses a safety cable suitable for buildings, which comprises: at least 2 electrically conductive wires; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires wrapped with the inner cladding are wrapped with outer claddings; the inner cladding from the conducting wire to the outer cladding is as follows in sequence: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer, a first modified ultrahigh molecular weight polyethylene fabric layer, an acrylic fiber layer and a second modified ultrahigh molecular weight polyethylene fabric layer; the outer cladding layer is: and a second flame-retardant EVA resin layer. The invention obviously improves the wear-resisting property of the EVA cable and prolongs the service life of the EVA cable in a building. Meanwhile, the risks of short circuit and electric leakage caused by abrasion of the cable in the using process are effectively avoided. The invention obviously improves the flame retardant property of the ultrahigh molecular weight polyethylene fabric modified EVA cable, the oxygen index can be improved to more than 28, the vertical combustion reaches V0 level, the damage length is small, and the self-extinguishing property is good.
Description
Technical Field
The invention belongs to the technical field related to cable preparation, and particularly relates to a safety cable suitable for buildings.
Background
A cable is a power or signal transmission device, and is generally composed of several wires or groups of wires. The cable includes power cable, control cable, compensation cable, shielding cable, high temperature cable, computer cable, signal cable, coaxial cable, fire-resistant cable, marine cable, mining cable, aluminum alloy cable, etc. With the development of economy, places needing cables are diversified, more strict and diversified requirements are provided for performance indexes of the sheath material for the cables, such as indexes of insulativity, tensile strength, use temperature, flame retardance and the like, the performance of the sheath material is continuously improved, and the method is an urgent need for economic and social development.
The outer sheath of cable is mostly selected for use elastomer material to prepare and is obtained, like the EVA material, and the flame retardant property of most elastomer material self is not good, in order to solve the fire resistance of cable sheath material, prior art mostly adopts the mode of adding the fire retardant to go on, for example: magnesium hydroxide, aluminum hydroxide, IFR flame retardant of APP system, and the like. However, the prior art still has the following problems: 1. inorganic metal salt such as magnesium hydroxide, aluminium hydroxide need add can only play effectual fire-retardant effect after certain quantity, but this moment elastomer material often can appear the toughness decline problem of different degrees, and when the cable was used in the building, because winding displacement needs and later maintenance needs, the cable often was installed in the ceiling of building or in the passageway furred ceiling or in the floor recess, and only few cables can encapsulate in the wall. At the moment, the cable in the building is often along with collision and abrasion with the wall body and the pipeline in the daily work process, and the low-toughness cable sheath can be worn out in the use process to cause failure of the cable sheath, so that serious potential safety hazards such as electric leakage and short circuit are caused. 2. The organic halogen-free flame retardant can have good compatibility with cable materials such as EVA, part of novel organic halogen-free flame retardant can also play roles in strengthening and toughening the EVA, and the like, but the flame retardant efficiency of the organic halogen-free flame retardant is generally poor, and a large amount of smoke is easily emitted in the combustion process.
In addition, because of the installation requirement of the cable used in the building, the cable often generates contact or pressure-contact abrasion with the wall bevel, the cable routing channel, and the like, so that the service life of the cable is often beyond expectation.
Disclosure of Invention
The invention aims to provide a safety cable suitable for buildings so as to solve the problem of flame retardance of the existing cable when the existing cable is used in the buildings.
In order to achieve the purpose, the invention provides the following technical scheme: a safety cable suitable for use in a building, comprising: at least 2 electrically conductive wires; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires wrapped with the inner cladding are wrapped with outer claddings; the inner cladding from the conducting wire to the outer cladding is as follows in sequence: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer, a first modified ultrahigh molecular weight polyethylene fabric layer, an acrylic fiber layer and a second modified ultrahigh molecular weight polyethylene fabric layer; the outer cladding layer is: and a second flame-retardant EVA resin layer.
Further, the first modified ultrahigh molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 7-10 parts of first modifier modified montmorillonite, wherein the first modifier is an organic matter containing P, N or a composition containing P, N.
Further, the first modifier is: acrylonitrile, acrylic acid copolymer and phosphoric acid.
Further, the structural formula of the first modifier modified montmorillonite is as follows:
wherein, the value of X is 20-40, and the value of Y is 6-8.
Furthermore, the mass of the acrylonitrile-acrylic acid copolymer is 68-73% of the total mass of the first modifier, and the total mass of the first modifier is 20-25% of the total mass of the montmorillonite.
Furthermore, the first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of the montmorillonite layer, so as to obtain the montmorillonite modified by the first modifier.
Further, the second modified ultrahigh molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultrahigh molecular weight polyethylene and 5-8 parts of second modifier; the second modifier is an organic matter containing P, N, S or a composition containing P, N, S.
Further, the second modifier is a copolymer of acrylonitrile-allylthiourea-vinyl phosphoric acid.
Further, the structural expression of the second modifier is as follows:
wherein, the value of n is 30-40, the value of m is 4-6, and the value of k is 6-8.
Further, the diameter of the conductive wire is taken as 100, the thickness of the first flame-retardant EVA resin layer is 8-10, the thickness of the first modified ultrahigh molecular weight polyethylene fabric layer is 1-2, and the thickness of the acrylic fiber layer is as follows: 5-8, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 3-5; the thickness of the second flame-retardant EVA resin layer is as follows: 10-13.
The invention has at least one of the following advantages:
1. the invention obviously improves the wear-resisting property of the EVA cable and prolongs the service life of the EVA cable in a building. Meanwhile, the risks of short circuit and electric leakage caused by abrasion of the cable in the using process are effectively avoided.
2. The invention obviously improves the flame retardant property of the ultrahigh molecular weight polyethylene fabric modified EVA cable, the oxygen index can be improved to more than 28, the vertical combustion reaches V0 level, the damage length is small, and the self-extinguishing property is good.
Drawings
Fig. 1 is a schematic structural view of a safety cable suitable for use in a building according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and technical effects to be solved by the present invention more clear and clear, the technical solutions of the present invention are described in detail below in combination with the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Unless otherwise specified, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.
The present invention illustratively provides a safety cable suitable for use in a building, as shown in fig. 1, comprising: at least 2 electrically conductive wires 1; each conductive wire 1 is externally wrapped with an inner cladding, and the conductive wires totally wrapped with the inner cladding are wrapped with an outer cladding 6. The inner cladding from the conductive wire to the outer cladding is as follows: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer 2, a first modified ultrahigh molecular weight polyethylene fabric layer 3, an acrylic fiber layer 4 and a second modified ultrahigh molecular weight polyethylene fabric layer 5. The outer cladding 6 is: and a second flame-retardant EVA resin layer.
The first flame-retardant EVA resin layer 2 and the second flame-retardant EVA resin layer are both prepared from commercial V0-grade EVA resin.
Through research, the applicant generally coats the conductor with an elastomer material to form a conductor coating, and then coats the conductor coated with the conductor coating with an elastomer outer layer to form the multi-conductor cable. Common wrapping materials such as EVA and the like are flammable materials, and flame retardant modification is needed for safety. When the existing EVA for the cable is subjected to flame retardant modification, an inorganic flame retardant or an organic halogen-free flame retardant is added in a common mode. Although the inorganic flame retardant has good flame retardant effect and self-extinguishing capability, the addition amount is high, and the compatibility with EVA is poor, so that the toughness of EVA is reduced, the service life of the EVA cable material is often lower than expected in daily use in buildings, and particularly in the interiors of buildings which are frequently abraded, such as corners, high-rise buildings and the like. Although the existing organic halogen-free flame retardant, such as IFR flame retardant, effectively overcomes the compatibility problem of the flame retardant and EVA, the flame retardant efficiency of the organic halogen-free flame retardant is generally significantly lower than that of the inorganic flame retardant, the self-extinguishing property is weak, and the organic halogen-free flame retardant is burnt a little and is usually extinguished after spreading to a large range to form a large enough heat insulation carbon layer. And because a large amount of flame retardants are added into the existing flame-retardant EVA, the addition amounts of reinforcing agents and toughening agents are influenced, so that the mechanical property is sometimes negatively influenced or can be improved to a small extent, but the problem that the service life of the EVA cable is not enough when the EVA cable is used in a building can not be effectively solved.
To this end, the present application improvesObtain a safety cable suitable for in the building, adopted this application safety cable structure, still be equipped with in 2 outsides on traditional first fire-retardant EVA resin layer: a first modified ultra-high molecular weight polyethylene fabric layer 3, an acrylic fiber layer 4 and a second modified ultra-high molecular weight polyethylene fabric layer 5. Wherein the acrylon in the acrylon layer 4 releases a large amount of non-combustible gas such as NO after being heated or ignited2、H2O、CO2And the like, and small molecular substances capable of capturing O free radicals, can obviously improve the self-extinguishing property of the cable and avoid the fire spread. But the toughness and the wear resistance of acrylic fiber are poor, and the acrylic fiber is directly coated outside the first flame-retardant EVA resin layer 2, so that the acrylic fiber layer 4 is easily abraded in the using process, and the acrylic fiber falls off, so that the acrylic fiber layer 4 is unevenly distributed, and the flame-retardant effect is influenced. Therefore, the first modified ultra-high molecular weight polyethylene fabric layer 3 and the second modified ultra-high molecular weight polyethylene fabric layer 5 are respectively arranged on the acrylic fiber layer 4. On the one hand, the ultra-high molecular weight polyethylene fabric layer that sets up can not produce wearing and tearing because characteristics such as its high wear resistance, smoothness height under the no special condition, consequently also can not appear because the first fire-retardant EVA resin layer 2 damage that leads to between the conductor wire 1 wears each other, the risk that conductor wire 1 exposes and causes the short circuit just also can not appear, can also play the problem that prevents the consumption of acrylic fibres layer 4 direct wear, has increased the life of cable. On the other hand, the invention utilizes the high strength characteristic of the ultra-high molecular weight polyethylene fabric layer, can obviously improve the mechanical property of the cable, and enlarges the installation range and the use mode of the cable. Meanwhile, after the outer cladding 6 is worn and damaged, the protection effect on the first flame-retardant EVA resin layer 2 is achieved, and the risk that the conductive wire 1 is exposed to cause short circuit and electric leakage due to continuous wear of the first flame-retardant EVA resin layer 2 is avoided.
However, the ultra-high molecular weight polyethylene fabric layer is itself a flammable substance, and once ignited, other coatings are easily burned, so that the fire spreads and simultaneously the short circuit and the electric leakage risk of the conductive wire 1 are caused. In some cases, they also produce molten droplets when they burn, resulting in a further spread of the fire. Therefore, the ultra-high molecular weight polyethylene fabric layers are respectively modified by the method, so that the defects of the ultra-high molecular weight polyethylene fabric layers are overcome.
The invention exemplarily provides a first modified ultrahigh molecular weight polyethylene layer, which comprises the following components in parts by weight: 100 parts of ultra-high molecular weight polyethylene and 7-10 parts of first modifier modified montmorillonite, wherein the first modifier is an organic matter containing P, N or a composition containing P, N.
The invention exemplarily provides a first modifier, which is: acrylonitrile, acrylic acid copolymer and phosphoric acid.
The invention provides a first modifier modified montmorillonite, which has a structural expression as follows:
wherein, the value of X is 20-40, and the value of Y is 6-8.
In the first modifier modified montmorillonite provided by the invention, the mass of the acrylonitrile-acrylic acid copolymer is 68-73% of the total mass of the first modifier, and the total mass of the first modifier is 20-25% of the total mass of the montmorillonite.
In the montmorillonite modified by the first modifier provided by the invention, the first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of a montmorillonite sheet, so that the montmorillonite modified by the first modifier is obtained.
Due to the flammable characteristic of the ultra-high molecular weight polyethylene, most organic halogen-free flame retardants are difficult to have a good flame retardant effect, and the applicant finds that the flame retardant performance of the ultra-high molecular weight polyethylene can be remarkably improved by adding the flame retardant containing P, N elements, but the compatibility of the existing P, N flame retardant and the ultra-high molecular weight polyethylene is not good, for example: APP, PAM and the like are difficult to be added into the ultra-high molecular weight polyethylene for flame retardant modification, and the flame retardant modification is carried out on the surface of the ultra-high molecular weight polyethylene by adopting a brushing or grafting method. However, the flame retardant coated or grafted on the surface of the ultra-high molecular weight polyethylene is easy to gradually wear in the use process of the cable, so that the flame retardant effect is gradually reduced to be ineffective. In addition, the conventional P, N flame retardant modified ultra-high molecular weight polyethylene generates more smoke during combustion.
The first modifier modified montmorillonite has good compatibility with the ultra-high molecular weight polyethylene, so that the first modifier modified montmorillonite can be directly added into the ultra-high molecular weight polyethylene for modification, and the ultra-high molecular weight polyethylene fiber with flame retardant property can be directly prepared, so that the ultra-high molecular weight polyethylene fabric with flame retardant property can be obtained. On the other hand, the smoke amount of the flame-retardant modified ultra-high molecular weight polyethylene modified by the montmorillonite modified by the first modifier is obviously reduced during combustion, and molten drops are not generated in the combustion process. Moreover, after the first modifier modified montmorillonite is used for carrying out flame retardant modification on the ultrahigh molecular weight polyethylene, the ultrahigh molecular weight polyethylene can form an expanded carbon layer with certain structural strength after being combusted, and the expanded carbon layer has the function of hindering heat propagation. Meanwhile, a large amount of residual silicate and silicon oxide compounds are enriched in the carbon layer, and when the conductive wire is stressed to be close to the conductive wire, even if the expanded carbon layer is stressed to be broken, the conductive wire can be isolated through the enriched silicate and silicon oxide compounds, so that the phenomena of short circuit and electric leakage are prevented to the maximum extent.
The invention exemplarily provides a second modified ultrahigh molecular weight polyethylene layer, which comprises the following components in parts by mass: 100 parts of ultrahigh molecular weight polyethylene and 5-8 parts of second modifier; the second modifier is organic matter containing P, N, S.
The present invention illustratively provides a second modifier which is: copolymers of acrylonitrile-allylthiourea-vinylphosphoric acid.
The invention exemplarily provides a second modifier, and the structural expression thereof is as follows:
wherein, the value of n is 30-40, the value of m is 4-6, and the value of k is 6-8.
When the second modifier is used for flame-retardant modification of the ultrahigh molecular weight polyethylene, on one hand, the second modifier has good compatibility with the ultrahigh molecular weight polyethylene, so that the second modifier can be directly added into the ultrahigh molecular weight polyethylene for modification, and the ultrahigh molecular weight polyethylene fiber with flame retardant property can be directly prepared, and then the ultrahigh molecular weight polyethylene fabric with flame retardant property can be obtained. On the other hand, the ultra-high molecular weight polyethylene flame-retardant modified by the montmorillonite modified by the second modifier can form a dense carbon layer with higher strength than an expanded carbon layer after combustion, so that free internal and external exchange of oxygen and oxygen is isolated, and the proceeding of thermal oxygen chain scission reaction is inhibited, thereby obviously improving the self-extinguishing property of the ultra-high molecular weight polyethylene, generating no molten drop in the combustion process, and effectively inhibiting external fire from spreading to the inside of a cable or internal fire from spreading to the outside of the cable. And the dense carbon layer can also play a good role in isolating mutual contact between the conductive wires, and the short circuit or electric leakage phenomenon is avoided as far as possible.
Meanwhile, the first modified ultra-high molecular weight polyethylene fabric layer, the acrylic fiber layer and the second modified ultra-high molecular weight polyethylene fabric layer can generate a synergistic effect, and the flame retardant effect is obviously improved.
The present invention illustratively provides a safety cable having a thickness of each layer: taking the diameter of the conductive wire as 100, the thickness of the first flame-retardant EVA resin layer is 8-10, the thickness of the first modified ultrahigh molecular weight polyethylene fabric layer is 1-2, and the thickness of the acrylic fiber layer is as follows: 5-8, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 3-5; the thickness of the second flame-retardant EVA resin layer is as follows: 10-13.
The thickness of each layer can play a good flame-retardant role, and the thickness of the cladding can be effectively controlled, so that the preparation and use costs are reduced. Particularly, the thickness of the first modified ultra-high molecular weight polyethylene fabric layer, the thickness of the acrylic fiber layer and the thickness of the second modified ultra-high molecular weight polyethylene fabric layer can obtain the best flame retardant effect only under a specific composition mode, and the transition thickening or thinning of any layer can seriously affect the whole flame retardant effect.
In order to explain the technical scheme of the application in more detail, the technology of the application is further specifically described in the following by combining specific examples, comparative examples and test results.
The test method comprises the following steps:
and (3) oxygen index test: testing for three times by using a GB 2406-80 method, and taking the average value to obtain LOI with the measurement unit of%.
Vertical burning test: and (3) testing for three times by using a UL94 vertical combustion testing method, taking the average value to obtain the damage length L, measuring the unit of cm, the self-extinguishing time T, measuring the unit of s, judging whether the absorbent cotton is ignited or not, and calibrating to obtain the flame retardant grade.
Cone calorimetry test: adopting an ISO5660 test method, recording THR as total heat release, and measuring the unit as MJ/m2The pkHRR is the peak heat release amount, and the measurement unit is kw/m2TSR is total smoke release amount, and the measurement unit is m2/m2。
Example 1
A safety cable suitable for use in a building, comprising: at least 2 electrically conductive wires; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires wrapped with the inner cladding are wrapped with outer claddings. The inner cladding from the conductive wire to the outer cladding is as follows: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer, a first modified ultrahigh molecular weight polyethylene fabric layer, an acrylic fiber layer and a second modified ultrahigh molecular weight polyethylene fabric layer. The outer cladding layer is as follows: and a second flame-retardant EVA resin layer. The diameter of the conductive wire is taken as 100 (no number), the thickness of the first flame-retardant EVA resin layer is 9, the thickness of the first modified ultrahigh molecular weight polyethylene fabric layer is 2, and the thickness of the acrylic fiber layer is as follows: 6, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 4; the thickness of the second flame-retardant EVA resin layer is as follows: 11. wherein:
the first flame-retardant EVA resin layer adopts a commercial V0 grade
The first modified ultra-high molecular weight polyethylene layer comprises the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 8 parts of first modifier modified montmorillonite. The structural formula of the first modifier modified montmorillonite is as follows:
the first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of the montmorillonite layer, so that the montmorillonite modified by the first modifier is obtained. Wherein, the value of X is 32, and the value of Y is 7. The mass of the acrylonitrile-acrylic acid copolymer is 70% of the total mass of the first modifier, and the total mass of the first modifier is 22% of the total mass of the montmorillonite.
The second modified ultra-high molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultrahigh molecular weight polyethylene and 6 parts of second modifier.
The structural expression of the second modifier is as follows:
wherein n is 35, m is 5, and k is 7.
Example 2
A safety cable suitable for use in a building, comprising: at least 2 electrically conductive wires; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires wrapped with the inner cladding are wrapped with outer claddings. The inner cladding from the conductive wire to the outer cladding is as follows: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer, a first modified ultrahigh molecular weight polyethylene fabric layer, an acrylic fiber layer and a second modified ultrahigh molecular weight polyethylene fabric layer. The outer cladding layer is as follows: and a second flame-retardant EVA resin layer. Taking the diameter of the conductive wire as 100 (no number), the thickness of the first flame-retardant EVA resin layer is 10, the thickness of the first modified ultra-high molecular weight polyethylene fabric layer is 2, and the thickness of the acrylic fiber layer is: and 8, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 5; the thickness of the second flame-retardant EVA resin layer is as follows: 13. wherein:
the first modified ultra-high molecular weight polyethylene layer comprises the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 10 parts of first modifier modified montmorillonite. The structural formula of the first modifier modified montmorillonite is as follows:
the first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of the montmorillonite layer, so that the montmorillonite modified by the first modifier is obtained. Wherein, the value of X is 40, and the value of Y is 8. The mass of the acrylonitrile-acrylic acid copolymer is 73% of the total mass of the first modifier, and the total mass of the first modifier is 25% of the total mass of the montmorillonite.
The second modified ultra-high molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultrahigh molecular weight polyethylene and 8 parts of second modifier.
The structural expression of the second modifier is as follows:
wherein n is 40, m is 6, and k is 8.
The test results are similar to those of example 1.
Example 3
A safety cable suitable for use in a building, comprising: at least 2 electrically conductive wires; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires wrapped with the inner cladding are wrapped with outer claddings. The inner cladding from the conductive wire to the outer cladding is as follows: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer, a first modified ultrahigh molecular weight polyethylene fabric layer, an acrylic fiber layer and a second modified ultrahigh molecular weight polyethylene fabric layer. The outer cladding layer is as follows: and a second flame-retardant EVA resin layer. Taking the diameter of the conductive wire as 100 (no number), the thickness of the first flame-retardant EVA resin layer is 8, the thickness of the first modified ultra-high molecular weight polyethylene fabric layer is 1, and the thickness of the acrylic fiber layer is: 5, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 3; the thickness of the second flame-retardant EVA resin layer is as follows: 10. wherein:
the first modified ultra-high molecular weight polyethylene layer comprises the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 7 parts of first modifier modified montmorillonite. The structural formula of the first modifier modified montmorillonite is as follows:
the first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of the montmorillonite layer, so that the montmorillonite modified by the first modifier is obtained. Wherein, the value of X is 20, and the value of Y is 6. The mass of the acrylonitrile-acrylic acid copolymer is 68% of the total mass of the first modifier, and the total mass of the first modifier is 20% of the total mass of the montmorillonite.
The second modified ultra-high molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultrahigh molecular weight polyethylene and 5 parts of second modifier.
The structural expression of the second modifier is as follows:
wherein n is 30, m is 4, and k is 6.
The test results are similar to those of example 1.
Comparative example 1
The remaining process is identical to example 1, with the difference that: and replacing the first modified ultrahigh molecular weight polyethylene fabric layer and the second modified ultrahigh molecular weight polyethylene fabric layer with pure ultrahigh molecular weight polyethylene fabric layers.
Comparative example 2
The remaining process is identical to example 1, with the difference that: the first modified ultra-high molecular weight polyethylene fabric layer is replaced by a pure ultra-high molecular weight polyethylene fabric layer.
Comparative example 3
The remaining process is identical to example 1, with the difference that: the second modified ultra-high molecular weight polyethylene fabric layer is replaced by a pure ultra-high molecular weight polyethylene fabric layer.
The test results are shown in table 1:
| numbering | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.3 | 2.4 | 0 | Whether or not | 78.1 | 776.8 | 312.5 |
| Comparative example 1 | 23.1 | 4.5 | 17 | Is that | 94.3 | 988.6 | 462.6 |
| Comparative example 2 | 21.2 | 4.2 | 15 | Is that | 92.3 | 963.9 | 425.3 |
| Comparative example 3 | 20.8 | 4.1 | 16 | Is that | 91.5 | 953.4 | 425.4 |
It can be known from the comparison results of comparative examples 2 and 3 and comparative example 1 that when the first modified ultra-high molecular weight polyethylene fabric layer or the second modified ultra-high molecular weight polyethylene fabric layer of the invention is simply adopted as the interlayer at one side of the acrylic fiber layer, and the pure ultra-high molecular weight polyethylene fabric layer is adopted at the other side, compared with the case that the pure ultra-high molecular weight polyethylene fabric layers are adopted at both sides, the flame retardant effect is not remarkably improved, and the reason is that: after the total content of the ultra-high molecular weight polyethylene exceeds a certain degree, due to the extremely flammable characteristic, even if the flame retardant is used for modification, the flame retardant effect is still difficult to achieve.
Comparative example 4
The remaining process is identical to example 1, with the difference that: the first modified ultra-high molecular weight polyethylene fabric layer and the second modified ultra-high molecular weight polyethylene fabric layer are both made of the first modified ultra-high molecular weight polyethylene fabric layer.
Comparative example 5
The remaining process is identical to example 1, with the difference that: the first modified ultra-high molecular weight polyethylene fabric layer and the second modified ultra-high molecular weight polyethylene fabric layer are both made of the second modified ultra-high molecular weight polyethylene fabric layer.
The test results are shown in table 2:
| numbering | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.3 | 2.4 | 0 | Whether or not | 78.1 | 776.8 | 312.5 |
| Comparative example 1 | 23.1 | 4.5 | 17 | Is that | 94.3 | 988.6 | 462.6 |
| Comparative example 4 | 25.7 | 3.4 | 8 | Whether or not | 82.3 | 863.9 | 385.3 |
| Comparative example 5 | 24.6 | 3.1 | 6 | Whether or not | 85.5 | 883.4 | 365.4 |
It can be known from the comparison results of comparative examples 4 and 5 and comparative example 1 that the flame retardant property is obviously improved by simply adopting the first modified ultrahigh molecular weight polyethylene fabric layer or the second modified ultrahigh molecular weight polyethylene fabric layer of the invention as the interlayer at the two sides of the acrylic fiber layer compared with the pure ultrahigh molecular weight polyethylene fabric layer.
However, as can be seen from the comparison results of comparative examples 4 and 5 with example 1, when the first modified ultra-high molecular weight polyethylene fabric layer and the second modified ultra-high molecular weight polyethylene fabric layer of the present invention are used as both side interlayers of the acrylic fiber layer, the flame retardant performance is further significantly improved, and it is seen that the first modified ultra-high molecular weight polyethylene fabric layer and the second modified ultra-high molecular weight polyethylene fabric layer of the present invention can produce a flame retardant synergistic effect, compared to when only the first modified ultra-high molecular weight polyethylene fabric layer or the second modified ultra-high molecular weight polyethylene fabric layer is used as both side interlayers of the acrylic fiber layer.
Comparative example 6
The remaining process is identical to example 1, with the difference that: in the first modified ultrahigh molecular weight polyethylene layer, the mass part of the first modifier modified montmorillonite is 15 parts.
Comparative example 7
The remaining process is identical to example 1, with the difference that: in the first modified ultrahigh molecular weight polyethylene layer, the mass part of the first modifier modified montmorillonite is 4 parts.
Comparative example 8
The remaining process is identical to example 1, with the difference that: in the second modified ultrahigh molecular weight polyethylene layer, the mass part of the second modifier is 15 parts.
Comparative example 9
The remaining process is identical to example 1, with the difference that: in the second modified ultrahigh molecular weight polyethylene layer, the mass part of the second modifier is 3 parts.
The test results are shown in table 3:
| numbering | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.3 | 2.4 | 0 | Whether or not | 78.1 | 776.8 | 312.5 |
| Comparative example 1 | 23.1 | 4.5 | 17 | Is that | 94.3 | 988.6 | 462.6 |
| Comparative example 6 | 28.2 | 2.5 | 0 | Whether or not | 77.8 | 768.4 | 317.5 |
| Comparative example 7 | 26.7 | 2.8 | 2 | Whether or not | 86.4 | 834.2 | 345.7 |
| Comparative example 8 | 28.4 | 2.4 | 0 | Whether or not | 77.5 | 764.9 | 308.9 |
| Comparative example 9 | 26.5 | 2.9 | 3 | Whether or not | 86.1 | 835.8 | 368.3 |
From the comparison results of comparative examples 6 to 7 with comparative example 1 and example 1, it can be seen that, when the mass parts of the first modifier modified montmorillonite and the second modifier are out of the ranges specified in the present invention, even if the addition amount is increased by about 50%, the flame retardant effect of the cable is not significantly improved. When the mass parts of the first modifier modified montmorillonite and the second modifier are lower than the range specified by the invention, the flame retardant effect of the cable is obviously reduced. Therefore, the first modifier modified montmorillonite and the second modifier of the invention can achieve better flame retardant effect only by adding specific components, and the high addition amount can not further improve the flame retardant effect, but can affect the mechanical property of the ultra-high molecular weight polyethylene.
Comparative example 10
The remaining process is identical to example 1, with the difference that: in the first modifier, the value of X is 50, and the value of Y is 7.
Comparative example 11
The remaining process is identical to example 1, with the difference that: in the first modifier, the value of X is 10, and the value of Y is 7.
Comparative example 12
The remaining process is identical to example 1, with the difference that: in the first modifier, the value of X is 32, and the value of Y is 11.
Comparative example 13
The remaining process is identical to example 1, with the difference that: in the first modifier, the value of X is 32, and the value of Y is 3.
The direct test results are shown in table 4:
| numbering | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.3 | 2.4 | 0 | Whether or not | 78.1 | 776.8 | 312.5 |
| Comparative example 1 | 23.1 | 4.5 | 17 | Is that | 94.3 | 988.6 | 462.6 |
| Comparative example 10 | 28.6 | 2.2 | 0 | Whether or not | 77.3 | 758.2 | 308.8 |
| Comparative example 11 | 26.7 | 2.8 | 3 | Whether or not | 83.5 | 847.2 | 325.4 |
| Comparative example 12 | 27.8 | 2.6 | 1 | Whether or not | 80.4 | 822.6 | 319.4 |
| Comparative example 13 | 28.5 | 2.4 | 0 | Whether or not | 78.2 | 763.4 | 310.7 |
The test results after 100 back-and-forth bending are shown in table 5:
| number of | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.2 | 2.4 | 0 | Whether or not | 78.3 | 776.4 | 309.8 |
| Comparative example 1 | 23.1 | 4.6 | 18 | Is that | 94.6 | 995.8 | 465.0 |
| Comparative example 10 | 25.6 | 3.7 | 9 | Whether or not | 84.7 | 836.8 | 323.6 |
| Comparative example 11 | 26.7 | 2.8 | 3 | Whether or not | 83.5 | 847.2 | 325.4 |
| Comparative example 12 | 27.8 | 2.6 | 1 | Whether or not | 80.4 | 822.6 | 319.4 |
| Comparative example 13 | 25.3 | 3.5 | 9 | Whether or not | 84.9 | 845.2 | 336.1 |
As is clear from tables 4 and 5, the first modifier has a specific ratio of acrylonitrile to acrylic acid copolymer. As shown in comparative examples 10 to 13, which show the compounding ratio of acrylonitrile to acrylic acid copolymer, the following problems occur: 1. the flame retardant performance is obviously reduced by increasing the content of acrylic acid in the acrylonitrile and acrylic acid copolymer. 2. Although the flame retardant performance is slightly improved compared with that of the example 1 by increasing the content of acrylonitrile in the acrylonitrile and acrylic acid copolymer, the flame retardant performance is greatly reduced compared with that of the example 1 after the acrylonitrile and acrylic acid copolymer are bent back and forth for 100 times. It can be seen that the flame retardant effect of the present invention can be achieved only by modifying montmorillonite with the first modifier according to the specific ratio of acrylonitrile to acrylic acid copolymer of the present invention.
Comparative example 14
The remaining process is identical to example 1, with the difference that: the mass of the acrylonitrile-acrylic acid copolymer is 80% of the total mass of the first modifier.
Comparative example 15
The remaining process is identical to example 1, with the difference that: the mass of the acrylonitrile-acrylic acid copolymer is 60% of the total mass of the first modifier.
The test results are shown in table 6:
| numbering | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.3 | 2.4 | 0 | Whether or not | 78.1 | 776.8 | 312.5 |
| Comparative example 1 | 23.1 | 4.5 | 17 | Is that | 94.3 | 988.6 | 462.6 |
| Comparative example 14 | 27.7 | 2.6 | 1 | Whether or not | 79.3 | 788.4 | 313.6 |
| Comparative example 15 | 27.3 | 2.6 | 1 | Whether or not | 78.8 | 782.4 | 316.2 |
From the results of comparing comparative examples 14 to 15 with comparative example 1 and example 1, it can be seen that increasing or decreasing the total mass of the acrylonitrile-acrylic acid copolymer in the first modifier results in a more significant decrease in the flame retardancy of the cable. The reason is that the balance of P, N element composition in the first modifier is destroyed by increasing or decreasing the mass percentage of the acrylonitrile and acrylic acid copolymer, so that when the cable is heated and burnt, no good synergistic effect is formed among the acrylonitrile, acrylic acid and phosphoric acid, and the montmorillonite can not be matched to form a carbon residue layer with certain strength, thereby reducing the flame retardant property.
Comparative example 16
The remaining process is identical to example 1, with the difference that: the total mass of the first modifier is 30 percent of the total mass of the montmorillonite.
Comparative example 17
The remaining process is identical to example 1, with the difference that: the total mass of the first modifier is 15 percent of the total mass of the montmorillonite.
The test results are shown in table 6:
from the results of comparing comparative examples 14 to 15 with comparative example 1 and example 1, it is understood that increasing the total mass ratio of the first modifier to montmorillonite does not significantly improve the flame retardant performance of the cable. And the flame retardant performance of the cable is remarkably reduced by reducing the total mass ratio of the first modifier to the montmorillonite. It can be seen that the flame-retardant modification effect contemplated by the present invention can be obtained only when the total mass of the first modifier is in a specific ratio to the total mass of montmorillonite, without an additional increase in modification cost.
Comparative example 18
The remaining process is identical to example 1, with the difference that: in the second modifier, n is 35, m is 5, and k is 10.
Comparative example 19
The remaining process is identical to example 1, with the difference that: in the second modifier, n is 35, m is 5, and k is 5.
Comparative example 20
The remaining process is identical to example 1, with the difference that: in the second modifier, n is 35, m is 8, and k is 7.
Comparative example 21
The remaining process is identical to example 1, with the difference that: in the second modifier, n is 35, m is 3, and k is 7.
Comparative example 22
The remaining process is identical to example 1, with the difference that: in the second modifier, n is 40, m is 5, and k is 7.
Comparative example 23
The remaining process is identical to example 1, with the difference that: in the second modifier, n is 30, m is 5, and k is 7.
The test results are shown in table 6:
| numbering | LOI | L | T | Absorbent cotton | THR | pkHRR | TSR |
| Example 1 | 28.3 | 2.4 | 0 | Whether or not | 78.1 | 776.8 | 312.5 |
| Comparative example 1 | 23.1 | 4.5 | 17 | Is that | 94.3 | 988.6 | 462.6 |
| Comparative example 18 | 27.3 | 2.6 | 1 | Whether or not | 79.6 | 787.5 | 316.7 |
| Comparative example 19 | 27.4 | 2.6 | 1 | Whether or not | 79.2 | 785.9 | 321.0 |
| Comparative example 20 | 26.9 | 2.5 | 0 | Whether or not | 78.9 | 792.2 | 318.5 |
| Comparative example 21 | 27.1 | 2.6 | 0 | Whether or not | 79.1 | 788.8 | 318.3 |
| Comparative example 22 | 27.1 | 2.5 | 1 | Whether or not | 79.1 | 792.3 | 320.7 |
| Comparative example 23 | 27.2 | 2.5 | 0 | Whether or not | 79.3 | 789.7 | 319.4 |
From the results of comparing comparative examples 18 to 23 with comparative example 1 and example 1, it can be seen that increasing or decreasing the degree of polymerization of any of the components of the acrylonitrile-allylthiourea-vinylphosphoric acid copolymer results in a decrease in the flame retardancy of the cable, and the decrease is significant, especially about 1% in the effect on the self-extinguishing property of the cable. The reason is that the increase or decrease of the polymerization degree of any component in the acrylonitrile-allylthiourea-vinyl phosphoric acid copolymer destroys the synergistic relationship of P, N, S element composition in the second modifier, so that when the cable is heated and combusted, no good synergistic effect is formed among acrylonitrile, allylthiourea and vinyl phosphoric acid, a dense carbon layer is not formed, the internal and external communication of heat, free radicals and oxygen cannot be effectively isolated, and the flame retardant property of the cable is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A safety cable adapted for use within a building, comprising: at least 2 electrically conductive wires; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires wrapped with the inner cladding are wrapped with outer claddings; the inner cladding from the conducting wire to the outer cladding is as follows in sequence: the flame-retardant EVA fabric comprises a first flame-retardant EVA resin layer, a first modified ultrahigh molecular weight polyethylene fabric layer, an acrylic fiber layer and a second modified ultrahigh molecular weight polyethylene fabric layer; the outer cladding layer is: and a second flame-retardant EVA resin layer.
2. The safety cable suitable for use in buildings according to claim 1, wherein the first modified ultra high molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 7-10 parts of first modifier modified montmorillonite, wherein the first modifier is an organic matter containing P, N or a composition containing P, N.
3. The safety cable adapted for use in a building of claim 2, wherein the first modifier is: acrylonitrile, acrylic acid copolymer and phosphoric acid.
4. The safety cable of claim 3, wherein the first modifier modified montmorillonite has the formula:
wherein, the value of X is 20-40, and the value of Y is 6-8.
5. The safety cable for use in buildings according to claim 3, wherein the total mass of the first modifier is 20 to 25% of the total mass of the montmorillonite.
6. The safety cable as claimed in claim 3, wherein the first modifier is modified montmorillonite by reacting with-OH groups on the surface of montmorillonite layer and inserting into montmorillonite layer.
7. The safety cable suitable for use in buildings according to claim 1, wherein the second modified ultra high molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultrahigh molecular weight polyethylene and 5-8 parts of second modifier; the second modifier is an organic matter containing P, N, S or a composition containing P, N, S.
8. A safety cable suitable for use in buildings according to claim 7, wherein the second modifier is a copolymer of acrylonitrile-allylthiourea-vinylphosphonic acid.
9. The safety cable adapted for use in buildings according to claim 8 wherein the structural expression of the second modifier is:
wherein, the value of n is 30-40, the value of m is 4-6, and the value of k is 6-8.
10. The safety cable applicable to the building according to claim 1, wherein the thickness of the first flame-retardant EVA resin layer is 8-10, the thickness of the first modified ultra-high molecular weight polyethylene fabric layer is 1-2, and the thickness of the acrylic fiber layer is as follows, taking the diameter of the conductive wire as 100: 5-8, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 3-5; the thickness of the second flame-retardant EVA resin layer is as follows: 10-13.
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| JP2008041510A (en) * | 2006-08-09 | 2008-02-21 | Yazaki Corp | Marking electric wire and cable |
| CN105976916A (en) * | 2016-03-14 | 2016-09-28 | 安徽华通电缆集团有限公司 | High flame-retardant power cable applied to nuclear power station |
| CN110804238A (en) * | 2019-11-06 | 2020-02-18 | 深圳供电局有限公司 | Modified crosslinked polyethylene, preparation method thereof and cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008041510A (en) * | 2006-08-09 | 2008-02-21 | Yazaki Corp | Marking electric wire and cable |
| CN105976916A (en) * | 2016-03-14 | 2016-09-28 | 安徽华通电缆集团有限公司 | High flame-retardant power cable applied to nuclear power station |
| CN110804238A (en) * | 2019-11-06 | 2020-02-18 | 深圳供电局有限公司 | Modified crosslinked polyethylene, preparation method thereof and cable |
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