CN114709016B - Safety cable suitable for in building - Google Patents
Safety cable suitable for in building Download PDFInfo
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- CN114709016B CN114709016B CN202210427282.8A CN202210427282A CN114709016B CN 114709016 B CN114709016 B CN 114709016B CN 202210427282 A CN202210427282 A CN 202210427282A CN 114709016 B CN114709016 B CN 114709016B
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- weight polyethylene
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- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 120
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 120
- 239000003063 flame retardant Substances 0.000 claims abstract description 105
- 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 94
- 239000004744 fabric Substances 0.000 claims abstract description 72
- 238000005253 cladding Methods 0.000 claims abstract description 46
- 229920005989 resin Polymers 0.000 claims abstract description 36
- 239000011347 resin Substances 0.000 claims abstract description 36
- 229920002972 Acrylic fiber Polymers 0.000 claims abstract description 26
- 239000003607 modifier Substances 0.000 claims description 102
- 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 53
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 229920005698 acrylonitrile and acrylic acid copolymer Polymers 0.000 claims description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical group C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000005416 organic matter Substances 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- KUKFKAPJCRZILJ-UHFFFAOYSA-N prop-2-enenitrile;prop-2-enoic acid Chemical compound C=CC#N.OC(=O)C=C KUKFKAPJCRZILJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 32
- 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
- 238000005299 abrasion Methods 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 149
- 230000000052 comparative effect Effects 0.000 description 69
- 230000000694 effects Effects 0.000 description 18
- 238000012360 testing method Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 230000004048 modification Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 9
- 229920000742 Cotton Polymers 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 229920001971 elastomer Polymers 0.000 description 5
- 239000000806 elastomer Substances 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 230000007480 spreading Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000012796 inorganic flame retardant Substances 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
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-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
- 238000011161 development Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 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
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229920006243 acrylic copolymer Polymers 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
- 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
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 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
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 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
Classifications
-
- 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 use in a building, comprising: at least 2 conductive lines; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires which are wrapped with the inner cladding are wrapped with an outer cladding; the inner cladding is sequentially from the conductive wire to the outer cladding: the first flame-retardant EVA resin layer, 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; the outer cladding is as follows: and a second flame retardant EVA resin layer. The wear-resistant EVA cable has the advantages that the wear-resistant property of the EVA cable is remarkably improved, and the service life of the EVA cable in a building is prolonged. Meanwhile, the risk of short circuit and electric leakage caused by abrasion of the cable in the use process is effectively avoided. The flame retardant property of the ultra-high molecular weight polyethylene fabric modified EVA cable is remarkably improved, the highest oxygen index can be increased to more than 28, the vertical combustion reaches V0 level, the damage length is smaller, and the self-extinguishing property is better.
Description
Technical Field
The invention belongs to the technical field of cable preparation, and particularly relates to a safety cable suitable for use in a building.
Background
A cable is an electrical energy or signal transmission device, typically consisting of several wires or groups of wires. The cables include power cables, control cables, compensation cables, shielding cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and the like. With the development of economy, the places where the cables are required to be used are diversified, and the performance indexes of the sheath materials for the cables are more strict and diversified, such as the indexes of insulativity, tensile strength, use temperature, flame retardant property and the like, are all strict, so that the performance of the sheath materials is continuously improved, and the urgent requirements of economy and social development are met.
The outer sheath of the cable is mostly prepared from elastomer materials, such as EVA materials, but most of the elastomer materials have poor flame retardant property, so that in order to solve the flame retardance of the cable sheath materials, the prior art is mostly carried out by adding flame retardants, for example: magnesium hydroxide, aluminum hydroxide, IFR flame retardants of APP systems, and the like. However, the following problems still remain in the prior art: 1. inorganic metal salts such as magnesium hydroxide and aluminum hydroxide can play an effective flame-retardant effect after a certain amount of inorganic metal salts is added, but at the moment, the problem of toughness reduction of different degrees of elastomer materials often occurs, and when the cable is used in a building, the cable is often installed in a ceiling of the building or a passageway ceiling or a floor groove due to the wire arrangement requirement and the later maintenance requirement, and only a small part of the cable can be packaged in a wall body. At this time, the cable in the building often accompanies collision and abrasion with the wall body and the pipeline in the daily working process, and the cable sheath with low toughness can lead to failure after abrasion in the use process, so that serious potential safety hazards such as electric leakage and short circuit are caused. 2. The organic halogen-free flame retardant can be well compatible with cable materials such as EVA, and part of the novel organic halogen-free flame retardant can also play roles in reinforcing, toughening and the like on EVA, 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 the cables used in the building are often worn out in contact or pressure contact with wall corners, cable routing channels and the like due to installation requirements, the service life of the cables is often not as long as expected.
Disclosure of Invention
The invention aims to provide a safety cable suitable for use in a building, so as to solve the problem of flame retardance of the existing cable when the cable is used in the building.
In order to achieve the above purpose, the present invention provides the following technical solutions: a safety cable adapted for use in a building, comprising: at least 2 conductive lines; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires which are wrapped with the inner cladding are wrapped with an outer cladding; the inner cladding is sequentially from the conductive wire to the outer cladding: the first flame-retardant EVA resin layer, 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; the outer cladding is as follows: and a second flame retardant EVA resin layer.
Further, 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.
Further, the first modifier is: acrylonitrile and acrylic acid copolymer, 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.
Further, the mass of the acrylonitrile and 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.
Further, the first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of the montmorillonite layers, so that the first modifier modified montmorillonite is obtained.
Further, the second modified ultra-high molecular weight polyethylene layer comprises, in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 5-8 parts of a 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:
Wherein, the value of n is 30-40, the value of m is 4-6,k, and the value of m is 6-8.
Further, when the diameter of the conductive wire is 100, 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: 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 wear-resistant EVA cable has the advantages that the wear-resistant property of the EVA cable is remarkably improved, and the service life of the EVA cable in a building is prolonged. Meanwhile, the risk of short circuit and electric leakage caused by abrasion of the cable in the use process is effectively avoided.
2. The invention obviously improves the flame retardant property of the ultra-high molecular weight polyethylene fabric modified EVA cable, the oxygen index can be increased to more than 28 at the highest, the vertical combustion reaches V0 level, the damage length is smaller, and the self-extinguishing property is better.
Drawings
Fig. 1 is a schematic structural view of a safety cable according to the present invention suitable for use in a building.
Detailed Description
In order to make the technical problems, technical schemes and technical effects to be solved more clearly apparent, the technical schemes of the invention are clearly and completely described in detail below by combining with the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods.
The present invention illustratively provides a safety cable for use in a building, as shown in fig. 1, comprising: at least 2 conductive wires 1; the outer part of each conductive wire 1 is wrapped with an inner cladding, and the conductive wires which are all wrapped with the inner cladding are wrapped with an outer cladding 6. The inner cladding is sequentially from the conductive wire to the outer cladding: the flame-retardant EVA resin layer comprises a first flame-retardant EVA resin layer 2, 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. The outer cladding 6 is: and a second flame retardant EVA resin layer.
Wherein, the first flame retardant EVA resin layer 2 and the second flame retardant EVA resin layer are both prepared by adopting commercial V0 grade EVA resin.
The applicant has studied that the existing multi-wire cable is generally formed by wrapping the wires with an elastomer material as a wire cladding, and then wrapping the wires fully wrapped with the wire cladding with an elastomer outer layer. Common wrapping materials such as EVA are all inflammable materials, and for safety reasons, flame retardant modification is required. 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. For inorganic flame retardants, although the flame retardant has good flame retardant effect and self-extinguishing capability, the flame retardant has higher addition amount and poor compatibility with EVA, so that the toughness of EVA is reduced, and the service life of the EVA cable material is often lower than expected when the EVA cable material is used in a building in daily life, especially in the interior of a building where abrasion is frequently generated, such as a corner, a high-rise building and the like. While the existing organic halogen-free flame retardant, such as an IFR flame retardant, effectively solves the problem of compatibility between the flame retardant and EVA, the flame retardant efficiency of the organic halogen-free flame retardant is generally remarkably lower than that of an inorganic flame retardant, the self-extinguishing property of the organic halogen-free flame retardant is weaker, and the organic halogen-free flame retardant is burnt at one point and tends to spread to a large range to form a heat-insulating carbon layer with a large enough area to be extinguished. The existing flame-retardant EVA has the problems that the addition amount of the reinforcing agent and the toughening agent is influenced due to the addition of a large amount of flame retardant, so that the mechanical property is sometimes negatively influenced or can be slightly improved, but the service life of the EVA cable is not enough when the EVA cable is used in a building.
Therefore, the application improves and obtains a safety cable suitable for the building, and adopts the safety cable structure of the application, and the outside of the traditional first flame-retardant EVA resin layer 2 is also provided with: 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. The acrylic fibers in the acrylic fiber layer 4 can release a large amount of nonflammable gas such as NO 2、H2O、CO2 and the like after being heated or ignited, and small molecular substances capable of capturing O free radicals can obviously improve the self-extinguishing property of the cable and avoid fire spreading. But the toughness and wear resistance of the acrylic fiber are poor, the acrylic fiber is directly coated outside the first flame-retardant EVA resin layer 2, abrasion is easy to occur in the using process, and the acrylic fiber of the acrylic fiber layer 4 is caused to fall, so that the acrylic fiber layer 4 is unevenly distributed, and the flame-retardant effect is affected. 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 is high in wear resistance and smoothness, and the like, and cannot be worn under no special conditions, so that the first flame-retardant EVA resin layer 2 is not damaged due to mutual wear between the conductive wires 1, the risk of short circuit caused by exposure of the conductive wires 1 is avoided, the problem of direct wear and consumption of the acrylic fiber layer 4 can be solved, and the service life of the cable is prolonged. On the other hand, the application utilizes the high strength characteristic of the ultra-high molecular weight polyethylene fabric layer, can obviously improve the mechanical property of the cable, and expands the installation range and the use mode of the cable. Meanwhile, after the outer wrapping layer 6 is worn and damaged, the protection effect on the first flame-retardant EVA resin layer 2 can be achieved, and the risk of short circuit and electric leakage caused by the fact that the first flame-retardant EVA resin layer 2 is continuously worn and damaged is avoided.
However, the ultra-high molecular weight polyethylene fabric layer is inflammable, and once the ultra-high molecular weight polyethylene fabric layer is ignited, other cladding layers are extremely easy to burn, so that the short circuit and the leakage risk of the conductive wire 1 are caused when the fire spreads. In some cases, it also produces droplets when burned, resulting in a further extensive spread of fire. Therefore, the application respectively modifies the ultra-high molecular weight polyethylene fabric layers to overcome the defects thereof.
The invention provides a first modified ultra-high molecular weight polyethylene layer, which comprises the following components 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.
The invention provides a first modifier, which is as follows: acrylonitrile and acrylic acid copolymer, phosphoric acid.
The invention provides a first modifier modified montmorillonite, which has the structural expression:
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 and 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 first modifier modified montmorillonite provided by the invention, the first modifier is inserted into montmorillonite layers after reacting with-OH groups on the surfaces of montmorillonite layers, so that the first modifier modified montmorillonite is obtained.
Because of the inflammability of the ultra-high molecular weight polyethylene, most organic halogen-free flame retardants are difficult to play a good flame retardant role, and the applicant finds that the flame retardant performance of the ultra-high molecular weight polyethylene can be obviously improved by adding the flame retardant containing P, N elements at the same time, 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 a brushing or grafting method is adopted to carry out flame-retardant modification on the surface of the ultra-high molecular weight polyethylene. However, the flame retardant coated or grafted on the surface of the ultra-high molecular weight polyethylene is easily worn gradually during the use of the cable, so that the flame retardant effect is gradually reduced to failure. In addition, the prior P, N flame retardant modified ultra-high molecular weight polyethylene can generate more smoke during combustion.
On the one hand, 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, ultra-high molecular weight polyethylene fiber with flame retardant property can be directly prepared, and further ultra-high molecular weight polyethylene fabric with flame retardant property can be obtained. On the other hand, the ultra-high molecular weight polyethylene modified by the first modifier modified montmorillonite flame retardant has obviously reduced smoke amount during combustion, and no molten drop is generated during the combustion process. After the first modifier modified montmorillonite is used for carrying out flame retardant modification on the ultra-high molecular weight polyethylene, the ultra-high molecular weight polyethylene can form an expanded carbon layer with certain structural strength after being combusted, and the effect of preventing heat from spreading is achieved. Meanwhile, residual silicate and silicon oxide compounds are enriched in the carbon layer in a large quantity, and when the conductive wires are stressed close to each other, even if the expanded carbon layer is stressed and broken, the conductive wires can be isolated through the enriched silicate and silicon oxide compounds, so that short circuit and electric leakage phenomena can be prevented to the greatest extent.
The invention provides a second modified ultra-high molecular weight polyethylene layer, which comprises the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 5-8 parts of a second modifier; the second modifier is an organic matter containing P, N, S.
The invention provides a second modifier, which is as follows: copolymers of acrylonitrile-allylthiourea-vinylphosphoric acid.
The invention provides a second modifier, which has the structural expression:
Wherein, the value of n is 30-40, the value of m is 4-6,k, and the value of m is 6-8.
When the second modifier is adopted to carry out flame-retardant modification on the ultra-high molecular weight polyethylene, on one hand, the second modifier has good compatibility with the ultra-high molecular weight polyethylene, so that the second modifier can be directly added into the ultra-high molecular weight polyethylene for modification, and ultra-high molecular weight polyethylene fiber with flame-retardant property is directly prepared, and further the ultra-high molecular weight polyethylene fabric with flame-retardant property is obtained. On the other hand, the ultra-high molecular weight polyethylene modified by the second modifier modified montmorillonite in a flame-retardant manner can form a dense carbon layer with higher strength than an expanded carbon layer after combustion, so that oxygen and oxygen are isolated from free internal and external exchange, and the thermal oxygen chain scission reaction is inhibited, thereby remarkably improving the self-extinguishing property of the ultra-high molecular weight polyethylene, avoiding the generation of molten drops in the combustion process, and effectively inhibiting the external fire from spreading to the inside of the cable or the internal fire from spreading to the outside of the cable. And the dense carbon layer can also play a role in well isolating mutual contact between the conductive wires, so that the occurrence of short circuit or electric leakage phenomenon is avoided as much 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 shown in the invention can generate synergistic effect, and the flame retardant effect is obviously improved.
The invention provides an exemplary thickness of each layer in a safety cable: the diameter of the conductive wire is recorded as 100, 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: 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 of the composite can play a good role in flame retardance, and the thickness of the cladding can be effectively controlled, so that the preparation and use cost is reduced. Especially, 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 in a specific composition mode, and the transitional thickening or thinning of any layer can seriously influence the integral 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 below by combining specific examples, comparative examples and test results.
The testing method comprises the following steps:
oxygen index test: the method is adopted for three times by GB 2406-80 method, and the LOI is obtained by taking the average value, wherein the measurement unit is%.
Vertical combustion test: and (3) testing for three times by adopting a UL94 vertical burning test method, taking an average value to obtain a damage length L, measuring the damage length L in cm, the self-extinguishing time T in s, whether absorbent cotton is ignited or not, and comparing the average value with a standard value to obtain the flame retardant grade.
Cone calorimetric test: by the ISO5660 test method, THR is recorded as total heat release, MJ/m 2, pkHRR as peak heat release, kw/m 2, TSR as total smoke release, m 2/m2.
Example 1
A safety cable adapted for use in a building, comprising: at least 2 conductive lines; and the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires which are wrapped with the inner cladding are wrapped with an outer cladding. The inner cladding is sequentially from the conductive wire to the outer cladding: the first flame-retardant EVA resin layer, 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. The outer cladding is as follows: and a second flame retardant EVA resin layer. The diameter of the conductive wire is recorded as 100 (no quantity), the thickness of the first flame retardant EVA resin layer is 9, the thickness of the first modified ultra-high 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, a step of; the thickness of the second flame retardant EVA resin layer is as follows: 11. wherein:
The first flame-retardant EVA resin layer adopts the V0 grade sold in the market
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 montmorillonite layers, so as to obtain the first modifier modified montmorillonite. Wherein, the value of X is 32, and the value of Y is 7. The mass of the acrylonitrile and 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 the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 6 parts of a second modifier.
The structural expression of the second modifier is as follows:
wherein, n has a value of 35, m has a value of 5, and k has a value of 7.
Example 2
A safety cable adapted for use in a building, comprising: at least 2 conductive lines; and the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires which are wrapped with the inner cladding are wrapped with an outer cladding. The inner cladding is sequentially from the conductive wire to the outer cladding: the first flame-retardant EVA resin layer, 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. The outer cladding is as follows: and a second flame retardant EVA resin layer. The diameter of the conductive wire is recorded as 100 (no quantity), 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: 8, the thickness of the second modified ultra-high molecular weight polyethylene fabric layer is as follows: 5, a step of; 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 montmorillonite layers, so as to obtain the first modifier modified montmorillonite. Wherein, the value of X is 40, and the value of Y is 8. The mass of the acrylonitrile and 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 the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 8 parts of a second modifier.
The structural expression of the second modifier is as follows:
Wherein, n is 40, m is 6,k and 8.
The test results were similar to those of example 1.
Example 3
A safety cable adapted for use in a building, comprising: at least 2 conductive lines; and the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires which are wrapped with the inner cladding are wrapped with an outer cladding. The inner cladding is sequentially from the conductive wire to the outer cladding: the first flame-retardant EVA resin layer, 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. The outer cladding is as follows: and a second flame retardant EVA resin layer. The diameter of the conductive wire is recorded as 100 (no quantity), 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, a step of; 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 montmorillonite layers, so as to obtain the first modifier modified montmorillonite. Wherein, the value of X is 20, and the value of Y is 6. The mass of the acrylonitrile and 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 the following components in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 5 parts of a second modifier.
The structural expression of the second modifier is as follows:
Wherein, n has a value of 30, m has a value of 4, and k has a value of 6.
The test results were similar to those of example 1.
Comparative example 1
The remaining procedure is as in example 1, except that: the first modified ultra-high molecular weight polyethylene fabric layer and the second modified ultra-high molecular weight polyethylene fabric layer are replaced with a pure ultra-high molecular weight polyethylene fabric layer.
Comparative example 2
The remaining procedure is as in example 1, except that: the first modified ultra-high molecular weight polyethylene fabric layer is replaced with a pure ultra-high molecular weight polyethylene fabric layer.
Comparative example 3
The remaining procedure is as in example 1, except that: the second modified ultra-high molecular weight polyethylene fabric layer is replaced with a pure ultra-high molecular weight polyethylene fabric layer.
The test results are shown in table 1:
| Numbering device | 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 |
As can be seen from the comparison results of comparative examples 2 and 3 and comparative example 1, when the first modified ultra-high molecular weight polyethylene fabric layer or the second modified ultra-high molecular weight polyethylene fabric layer according to the present invention is simply used as the interlayer on one side of the acrylic fiber layer, and the pure ultra-high molecular weight polyethylene fabric layer is used on the other side, the flame retardant effect is not significantly improved compared with the case that the pure ultra-high molecular weight polyethylene fabric layer is used on both sides, because: when the total content of the ultra-high molecular weight polyethylene exceeds a certain level, it is difficult to achieve a proper flame retardant effect due to the extremely flammable property even if the flame retardant is modified.
Comparative example 4
The remaining procedure is as in example 1, except 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 procedure is as in example 1, except 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 device | 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 |
As is clear from the comparison results of comparative examples 4 and 5 and comparative example 1, the flame retardant property is significantly improved by simply using the first modified ultra-high molecular weight polyethylene fabric layer or the second modified ultra-high molecular weight polyethylene fabric layer of the present invention as the interlayer on both sides of the acrylic fiber layer, compared with the pure ultra-high molecular weight polyethylene fabric layer.
However, as is clear from the comparison between comparative examples 4 and 5 and example 1, the flame retardant properties are further significantly improved when the first modified ultra-high molecular weight polyethylene fabric layer and the second modified ultra-high molecular weight polyethylene fabric layer according to the present invention are used as both side interlayers of the acrylic layer, compared with when 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 layer, 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 according to the present invention can produce a flame retardant synergistic effect.
Comparative example 6
The remaining procedure is as in example 1, except that: in the first modified ultra-high molecular weight polyethylene layer, the mass portion of the first modifier modified montmorillonite is 15 portions.
Comparative example 7
The remaining procedure is as in example 1, except that: in the first modified ultra-high molecular weight polyethylene layer, the mass part of the first modifier modified montmorillonite is 4.
Comparative example 8
The remaining procedure is as in example 1, except that: in the second modified ultra-high molecular weight polyethylene layer, the mass part of the second modifier is 15 parts.
Comparative example 9
The remaining procedure is as in example 1, except that: in the second modified ultra-high molecular weight polyethylene layer, the mass part of the second modifier is 3.
The test results are shown in table 3:
| Numbering device | 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 |
As is clear from the comparison results of comparative examples 6 to 7 with comparative examples 1 and example 1, when the mass fraction of the first modifier modified montmorillonite and the mass fraction of the second modifier are out of the ranges specified in the present invention, the flame retardant effect of the cable is not significantly improved even if the addition amount is increased by about 50%. And when the mass parts of the first modifier 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 can achieve better flame retardant effect only by adding specific component amounts, and the high addition amount cannot further improve the flame retardant effect, but can affect the mechanical property of the ultra-high molecular weight polyethylene.
Comparative example 10
The remaining procedure is as in example 1, except that: in the first modifier, X has a value of 50 and Y has a value of 7.
Comparative example 11
The remaining procedure is as in example 1, except that: in the first modifier, X has a value of 10 and Y has a value of 7.
Comparative example 12
The remaining procedure is as in example 1, except that: in the first modifier, X has a value of 32 and Y has a value of 11.
Comparative example 13
The remaining procedure is as in example 1, except that: in the first modifier, X has a value of 32 and Y has a value of 3.
The direct test results are shown in table 4:
| Numbering device | 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 bending back and forth 100 times are shown in table 5:
| Numbering device | 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 ratio of the acrylonitrile to the acrylic acid copolymer in the first modifier is specifically required. As shown in comparative examples 10 to 13, the following problems occur in the proportions of acrylonitrile and acrylic acid copolymer: 1. the content of acrylic acid in the acrylonitrile and acrylic acid copolymer is increased, so that the flame retardant property is obviously reduced. 2. The acrylonitrile content in the acrylonitrile-acrylic copolymer was increased, and although the flame retardant property was slightly improved as compared with example 1, the flame retardant property was significantly reduced as compared with example 1 after being bent back and forth 100 times. It can be seen that the first modifier modified montmorillonite can only play the expected flame-retardant effect only under the specific proportion of the acrylonitrile and the acrylic acid copolymer.
Comparative example 14
The remaining procedure is as in example 1, except that: the mass of the acrylonitrile and acrylic acid copolymer was 80% of the total mass of the first modifier.
Comparative example 15
The remaining procedure is as in example 1, except that: the mass of the acrylonitrile and acrylic acid copolymer is 60% of the total mass of the first modifier.
The test results are shown in table 6:
| Numbering device | 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 comparison of comparative examples 14 to 15 with comparative example 1 and example 1, it is understood 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 retardant properties of the cable. The reason is that increasing or decreasing the mass percentage of the acrylonitrile and the acrylic acid copolymer can destroy the balance of P, N elements in the first modifier, so that when the cable is burnt by heating, no good synergistic effect is formed among the acrylonitrile, the acrylic acid and the phosphoric acid, and the carbon residue layer with certain strength can not be formed by matching with montmorillonite, thereby reducing the flame retardant property.
Comparative example 16
The remaining procedure is as in example 1, except that: the total mass of the first modifier is 30% of the total mass of the montmorillonite.
Comparative example 17
The remaining procedure is as in example 1, except that: the total mass of the first modifier is 15% of the total mass of the montmorillonite.
The test results are shown in table 6:
From the comparison of comparative examples 14 to 15 with comparative examples 1 and example 1, it is understood that increasing the total mass ratio of the first modifier to montmorillonite did not significantly improve the flame retardant properties of the cable. And the total mass ratio of the first modifier to the montmorillonite is reduced, so that the flame retardant property of the cable is remarkably reduced. It can be seen that the flame retardant modification effect contemplated by the present invention can be achieved only when the total mass of the first modifier is in a specific ratio to the total mass of the montmorillonite, without additional modification costs.
Comparative example 18
The remaining procedure is as in example 1, except that: in the second modifier, n has a value of 35, m has a value of 5, and k has a value of 10.
Comparative example 19
The remaining procedure is as in example 1, except that: in the second modifier, n has a value of 35, m has a value of 5, and k has a value of 5.
Comparative example 20
The remaining procedure is as in example 1, except that: in the second modifier, n has a value of 35, m has a value of 8, and k has a value of 7.
Comparative example 21
The remaining procedure is as in example 1, except that: in the second modifier, n has a value of 35, m has a value of 3, and k has a value of 7.
Comparative example 22
The remaining procedure is as in example 1, except that: in the second modifier, n has a value of 40, m has a value of 5, and k has a value of 7.
Comparative example 23
The remaining procedure is as in example 1, except that: in the second modifier, n has a value of 30, m has a value of 5, and k has a value of 7.
The test results are shown in table 6:
| Numbering device | 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 |
As is evident from the comparison of comparative examples 18 to 23 with comparative examples 1 and example 1, an increase or decrease in the polymerization degree of any of the components in the acrylonitrile-allylthiourea-vinylphosphoric acid copolymer resulted in a decrease in flame retardant properties of the cable, and the decrease in the degree was more remarkable, particularly the influence on the self-extinguishing properties of the cable, the decrease in the degree was about 1%, and it was a more remarkable decrease. The reason is that increasing or decreasing the polymerization degree of any component in the copolymer of acrylonitrile-allylthiourea-vinyl phosphoric acid can destroy the synergistic relationship of P, N, S elements in the second modifier, so that when the cable is burnt by heating, no good synergistic effect is formed among acrylonitrile, allylthiourea and vinyl phosphoric acid, no dense carbon layer is formed, internal and external communication of heat, free radicals and oxygen can not be effectively isolated, and further the flame retardant performance of the cable is reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A safety cable for use in a building, comprising: at least 2 conductive lines; the outer part of each conductive wire is wrapped with an inner cladding, and the conductive wires which are wrapped with the inner cladding are wrapped with an outer cladding; the inner cladding is sequentially from the conductive wire to the outer cladding: the first flame-retardant EVA resin layer, 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; the outer cladding is as follows: a second flame retardant EVA resin layer;
the first modified ultra-high molecular weight polyethylene fabric layer comprises the following components 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 a composition containing P, N;
The first modifier is as follows: a combination of acrylonitrile and acrylic acid copolymer and phosphoric acid; wherein the number of repeating units of acrylonitrile in the acrylonitrile-acrylic acid copolymer: number of repeating units of acrylic acid = 20-40:6-8;
The first modifier is inserted between montmorillonite layers after reacting with-OH groups on the surface of montmorillonite layers, so as to obtain the first modifier modified montmorillonite.
2. A safety cable according to claim 1, wherein the total mass of the first modifier is 20-25% of the total mass of the montmorillonite.
3. The safety cable of claim 1, wherein the second modified ultra-high molecular weight polyethylene fabric layer comprises, in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 5-8 parts of a second modifier; the second modifier is an organic matter containing P, N, S.
4. A safety cable adapted for use in a building according to claim 3, wherein the second modifier is a copolymer of acrylonitrile-allylthiourea-vinyl phosphoric acid.
5. The safety cable of claim 4, wherein the second modifier has a structural expression:
Wherein, the value of n is 30-40, the value of m is 4-6,k, and the value of m is 6-8.
6. The safety cable of claim 1, wherein the second modified ultra-high molecular weight polyethylene fabric layer comprises, in parts by mass: 100 parts of ultra-high molecular weight polyethylene and 5-8 parts of a second modifier; the second modifier is a composition containing P, N, S.
7. The safety cable of claim 1, wherein the first flame retardant EVA resin layer has a thickness of 8 to 10, the first modified ultra high molecular weight polyethylene fabric layer has a thickness of 1 to 2, and the acrylic layer has a thickness of: 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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| 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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| 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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