CN100347792C - Flame-proof power cable for track traffic and process for manufacture - Google Patents
Flame-proof power cable for track traffic and process for manufacture Download PDFInfo
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- CN100347792C CN100347792C CNB2005100378232A CN200510037823A CN100347792C CN 100347792 C CN100347792 C CN 100347792C CN B2005100378232 A CNB2005100378232 A CN B2005100378232A CN 200510037823 A CN200510037823 A CN 200510037823A CN 100347792 C CN100347792 C CN 100347792C
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Abstract
The present invention relates to an electric cable for rail traffic and a preparation method thereof, which is characterized in that a polyethylene insulation layer is water-tree-retardant irradiation crosslinking polyethylene; an outer protection layer is mixing polyolefin of radiation low-smoke polyethylene without halogen, and ethylene-vinyl acetate copolymer. Besides, because the cable uses a lapping bag of non-moisture absorption glass fibers and a five-layer compound insulation layer of a vertical copper belt bag, the electric performance, the flame retardant performance, the water resistance performance, the water tree retardancy and the physical mechanical performance of the cable are greatly improved. The electric cable can completely reach the test requirements of an IA grade of flame retardant cable prescribed by the standard GA306.1-2001 of a public security ministry and satisfy the use requirements of the electric cable for the rail traffic.
Description
Technical field
The present invention relates to a kind of improved track traffic with power cable and preparation method.
Background technology
Because the particularity of track traffic is high to fail safe, the reliability requirement of electric power system.Require cable not only nonflammable, and combustion process seldom discharges smog, poison gas and corrosive gas, therefore require cable to have the low-smoke bittern-free highly fire-proof performance.Secondly, requiring cable (especially subway cable) insulating barrier to have stronger anti-moisture invades and " anti-water tree " ability.Because moisture immerses cable, can cause oxidation, the corrosion of conductor, not only influence the electrical property of cable, and the abnormal broken line accident can take place when serious.Produce in the insulating barrier " water tree ", the electricity that can quicken cable is aging, even causes the cable breakdown accident, reduces cable useful life.
Common low-smoke bittern-free highly fire-proof cable, the conductor external insulation layer is for adopting the crosslinked crosslinked polyethylene of chemical mode, and outer jacket is for adding the polyolefin of inorganic combustion inhibitor (for example magnesium hydroxide and aluminium hydroxide).The crosslinked polyetylene insulated layer that chemical mode is crosslinked, temperature resistant grade not high (generally being no more than 90 ℃), and under the effect of highfield, can produce " water tree " in the crosslinked polyetylene insulated layer; Secondly, the cumyl peroxide of mixing chemical cross-linking agents such as (DCP) can produce toxic chemical substances such as cumyl alcohol and acetophenone, and serious peculiar smell is arranged in the production process, and contaminated environment; Besides, chemical crosslinking needs to carry out in high temperature and high pressure environment, not only can make material aging influence the life-span, but also it is stable to destroy the cable internal structure, and the fail safe of transmission line and reliability reduce.The low-smoke halogen-free polyolefin outer jacket that a large amount of inorganic combustion inhibitors that mix constitute, not only the fire retardant that mixes in production and use very easily decomposes, and then influences the anti-flammability and the mechanical performance of cable; And directly mix a large amount of inorganic combustion inhibitors, also can cause sheath electrical property and physical and mechanical properties to descend by a relatively large margin (for example causing material environment stress cracking and tensile strength, elongation at break to descend).These all can reduce cable useful life and service rating.
Though Chinese patent 02116893.8 discloses a kind of irradiated crosslinking low-smoke and halogen-free flame retardant cable, not only the not anti-equally water tree of insulating layer material still can produce " water tree " under the effect of highfield; And directly add relatively large inorganic combustion inhibitor in the insulating barrier, and also cause the insulating barrier electrical property to descend, therefore use as insulating material, can only be used for low pressure (0.6/1kV and following) core.The sheath base-material adopts single polyethylene, and base-material and other compatibilities of adding filler are relatively poor, can cause processing characteristics to descend; Magnesium hydroxide and aluminium hydroxide fire retardant and base-material poor with affinity can cause the blend system cohesion energy density to descend, and material property is brought adverse effect.Therefore still having is worth improved place.Therefore, can make crosslinked polymer, only rest on the common cable formulation material basis, can not overcome some FAQs, still have such-and-such deficiency although people know irradiation already.
Besides, cable adopts ordinary construction, still is difficult to reach the high standard requirement, therefore causes existing flame-proof power cable for track traffic, is difficult to reach the IA level flame retardant cable test requirements document of the GA306.1-2001 of Ministry of Public Security standard code.
Summary of the invention
The objective of the invention is to overcome all deficiencies of above-mentioned prior art, a kind of insulating barrier temperature resistant grade height is provided, anti-water tree performance is good, low-smoke bittern-free highly fire-proof can be guaranteed the cable machinery physical property again, and security performance is good, environmental protection, the flame-proof power cable for track traffic of long service life.
Another object of the present invention is to provide a kind of preparation method of above-mentioned cable.
The object of the invention realizes that main the improvement is to change the processes for chemically crosslinked polyethylene insulating barrier into anti-water tree irradiation type crosslinked polyetylene insulated layer, and outer jacket adopts irradiation low smoke and zero halogen compound polyolefin, thereby has overcome the deficiency that above-mentioned prior art is brought.Specifically, flame-proof power cable for track traffic of the present invention, comprise conductor, crosslinked polyetylene insulated layer, the low-smoke halogen-free polyolefin outer jacket, it is characterized in that said crosslinked polyetylene insulated layer is for being added with anti-water tree agent and sensitizer IXPE, said low-smoke halogen-free polyolefin outer jacket is that polyethylene is added with sensitizer with the polyolefin that mixes of ethylene-vinyl acetate copolymer, and by 5-10wt% soap, the 0.3-1.5wt% titanate coupling agent, surplus is magnesium hydroxide and aluminium hydroxide inorganic composite flame retardants cross-linking radiation, and heat insulation oxygen barrier layer is arranged between insulating barrier and outer jacket.
For further improving cable-flame retardant, block-water effect, the said heat insulation oxygen barrier layer of the present invention, a kind of better is to adopt wrapped non-hygroscopic glass fiber tape, extrude the oxygen barrier flame-retardant layer, wrapped non-hygroscopic glass fiber tape, embossing behind the vertical copper-clad band, wrapped non-hygroscopic glass fiber tape compound heat-insulation oxygen barrier layer.
Insulating layer material of the present invention, by 100 parts of low density polyethylene (LDPE)s, carbon black 2-3 part, anti-water tree additive 2-3 part, antioxidant 0.2-0.4 part, metal deactivator 0.2-0.5 part, the mixing of sensitizer 1-2 part is formed.Wherein anti-water tree additive better adopts ethylene-propylene copolymer or ethylene-octene copolymer, and antioxidant better adopts phenols and/or amine antioxidants, and metal deactivator preferably adopts two salicylidenes for the acyl vagina, and sensitizer preferably adopts triallyl isonitrile urea acid fat.
Sheath material of the present invention, mix 100 parts of polyolefin, carbon black 2-5 part, antioxidant 0.2-0.4 part by 40-60 part low density polyethylene (LDPE) and 60-40 part ethylene-vinyl acetate copolymer (EVA), inorganic composite flame retardants 100-160 part, the mixing of sensitizer 1-2 part is formed.Wherein antioxidant can preferably adopt phenols, amine antioxidants equally; inorganic composite flame retardants is for being that the mixing of magnesium hydroxide and aluminium hydroxide is formed by soap (for example selecting zinc stearate, barium stearate, calcium stearate) 5-10%, titanate coupling agent (for example two isostearic acid acyl group isopropyl titanates, isopropyl three oily acyloxy titanate esters, isopropyl three (12 benzene sulfonamide acyl group) titanate esters) 0.3-1.5%, surplus, and sensitizer can preferably be adopted as triallyl isonitrile urea acid fat equally.
Cable making method of the present invention is characterized in that extruding the polyethylene layer that is added with anti-water tree agent and sensitizer, cross-linking radiation on conductor; Stranding; Pack heat insulation oxygen barrier layer; Extrude be added with sensitizer, and by 5-10wt% soap, 0.3-1.5wt% titanate coupling agent, surplus be magnesium hydroxide and aluminium hydroxide inorganic composite flame retardants polyethylene and ethylene-vinyl acetate copolymer mix polyolefin outer jacket, cross-linking radiation.
If adopt the compound heat-insulation oxygen barrier layer, wrapped non-hygroscopic glass fiber tape earlier successively when packing heat insulation oxygen barrier layer then, after extrude the oxygen barrier flame-retardant layer, wrapped again non-hygroscopic glass fiber tape, vertical copper-clad band and embossing, wrapped non-hygroscopic glass fiber tape.
The said cross-linking radiation of the present invention, its method and parameter has no special requirements with irradiation is basic identical usually.
Gained cable of the present invention, its insulating barrier polyethylene is owing to add anti-water tree additive and adopt cross-linking radiation, overcome the deficiency that general chemistry is crosslinked and add fire retardant cross-linking radiation insulating barrier, not only significantly improved the temperature resistant grade of cable, heatproof can be brought up to more than 120 ℃ by 90 ℃ of chemical crosslinking, and has a stronger anti-water tree performance, even under wet environment, also be difficult to produce " water tree ", and the insulating barrier physical and mechanical properties does not descend, can guarantee that cable uses in the high voltage grade, the long-term use worn out.
Outer jacket adopts the compound polyolefin base-material to add cross-linking radiation behind the composite modified fire retardant, and not only fire retardant aluminium hydroxide and magnesium hydroxide are difficult for decomposing, and can guarantee good flame retardant property, can not damage the sheath mechanical performance; And good with other compatibilities of adding filler, can guarantee good processing characteristics, extrude easily, the product softness, the yield modulus ratio can reduce 20-40%; Aluminium, magnesium fire retardant add soap, titanate coupling agent is handled, and make its surface property improve, and have improved the affinity with base-material greatly, and water resistance is untreated and improves a lot, and tensile strength can improve 15-25%.
Multiple non-hygroscopic glass fiber tape is wrapped, and the vertical bag of copper strips, blocking oxygen and flame heat regulating are to internal delivery and stop moisture intrusion performance good, not only nonflammable, and also seldom discharge smog, poison gas and corrosive gas in the burning situation, cable is had block water, anti-water tree, fire-retardant, low cigarette, the comprehensive premium properties of Halogen, can reach the IA level flame retardant cable test requirements document of the standard GA306.1-2001 of Ministry of Public Security regulation.Under the experimental condition of regulation, light transmittance is brought up to more than 80% by 40-60%, and the halogen acid gas escaped quantity is reduced to 5mg/g by 12mg/g, and under equal service condition, can prolong 20-30%. useful life
Cable of the present invention has significantly improved the thermal endurance of high polymer, thereby make cable material anti-molten, refractory melts, soldering resistance can significantly improve, and electrical property, fire resistance, block water, anti-water tree, physical and mechanical properties be greatly improved, this is that the present invention is different from the crucial part of other cables, satisfies the track traffic electric power cable fully and uses.
Below in conjunction with an embodiment, further specify the present invention.
Description of drawings
Accompanying drawing is an embodiment of the invention construction of cable schematic diagram.
Embodiment
Embodiment: referring to accompanying drawing, flame-proof power cable for track traffic of the present invention, its structure is to be irradiation type crosslinked polyethylene insulation material 2 outside the conductor 1, after forming cable core, wrapped non-hygroscopic glass fiber tape 3 is extruded with oxygen barrier flame-retardant layer 4, wrapped successively again non-hygroscopic glass fiber tape 3, vertical copper-clad band 5 and embossing, wrapped non-hygroscopic glass fiber tape 3, outermost layer are irradiation type low-smoke halogen-free polyolefin outer jacket 6.
Insulating barrier is by 100 parts of low density polyethylene (LDPE)s, carbon black 2-3 part, the anti-water tree of ethylene-propylene copolymer or ethylene-octene copolymer additive 2-3 part, four [methylene β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] and/or 1,1,3-three (2-methyl-4-hydroxyl-5-tert-butyl-phenyl) butane antioxidant 0.2-0.4 part, two salicylidenes are for acyl vagina metal deactivator 0.2-0.5 part, triallyl isonitrile urea acid fat sensitizer 1-2 part is mixed, through the plasticizing granulation, extrude in the conductor appearance, put into the irradiation room through crosslinking electron beam irradiation (irradiation technique parameter and equivalent diameter cable polyolefin irradiation are similar).Wrapped non-hygroscopic glass fiber tape 3 extrudes oxygen barrier flame-retardant layer 4 respectively, wrapped non-hygroscopic glass fiber tape 3, vertical copper-clad band 5 back embossings, wrapped non-hygroscopic glass fiber tape 3.Extrude outer jacket by 50 parts of low density polyethylene (LDPE)s; 50 parts of ethylene-vinyl acetate copolymers (EVA); carbon black 2-5 part; four [methylene β-(3; the 5-di-tert-butyl-hydroxy phenyl) propionic acid] and/or 1; 1; 3-three (2-methyl-4-hydroxyl-5-tert-butyl-phenyl) butane antioxidant 0.2-0.4 part; composite flame-retardant agent (zinc stearate 5-10%; two isostearic acid acyl group isopropyl titanate 0.3-1.5%; surplus is magnesium hydroxide and aluminium hydroxide) 100-160 part; triallyl isonitrile urea acid fat sensitizer 1-2 part is mixed; through the plasticizing granulation, put into the irradiation room after extruding through crosslinking electron beam irradiation (irradiation technique parameter and equivalent diameter cable polyolefin irradiation are similar).
Each functional additive among the embodiment can also adopt known other similar additives to substitute, and can reach key property of the present invention equally.
Cable core can be single core according to instructions for use, also can be multicore.
Claims (6)
1, flame-proof power cable for track traffic, comprise conductor, crosslinked polyetylene insulated layer, the low-smoke halogen-free polyolefin outer jacket, it is characterized in that said crosslinked polyetylene insulated layer is for being added with anti-water tree agent and sensitizer IXPE, said low-smoke halogen-free polyolefin outer jacket is that polyethylene is added with sensitizer with the polyolefin that mixes of ethylene-vinyl acetate copolymer, and by 5-10wt% soap, the 0.3-1.5wt% titanate coupling agent, surplus is the inorganic composite flame retardants cross-linking radiation that magnesium hydroxide and aluminium hydroxide are formed, and heat insulation oxygen barrier layer is arranged between insulating barrier and outer jacket.
2, according to the described flame-proof power cable for track traffic of claim 1, it is characterized in that said heat insulation oxygen barrier layer is wrapped non-hygroscopic glass fiber tape, extrude the oxygen barrier flame-retardant layer, wrapped non-hygroscopic glass fiber tape, vertical copper-clad band and embossing, the compound heat-insulation oxygen barrier layer that wrapped non-hygroscopic glass fiber tape is formed.
3,, it is characterized in that said crosslinked polyetylene insulated layer by 100 parts of low density polyethylene (LDPE)s, carbon black 2-3 part according to claim 1 or 2 described flame-proof power cable for track traffic, anti-water tree additive 2-3 part, antioxidant 0.2-0.4 part, metal deactivator 0.2-0.5 part, sensitizer 1-2 part is formed.
4, according to claim 1 or 2 described flame-proof power cable for track traffic, it is characterized in that said outer jacket mixes 100 parts of polyolefin by 40-60 part low density polyethylene (LDPE) and 60-40 part ethylene-vinyl acetate copolymer, carbon black 2-5 part, antioxidant 0.2-0.4 part, inorganic composite flame retardants 100-160 part, the mixing of sensitizer 1-2 part is formed.
5, a kind of as arbitrary flame-proof power cable for track traffic preparation method as described in the claim 1-4, it is characterized in that on conductor, extruding the polyethylene layer that is added with anti-water tree agent and sensitizer, cross-linking radiation; Stranding; Pack heat insulation oxygen barrier layer; Extrude be added with sensitizer, and by 5-10wt% soap, 0.3-1.5wt% titanate coupling agent, surplus be the inorganic composite flame retardants formed of magnesium hydroxide and aluminium hydroxide polyethylene and ethylene-vinyl acetate copolymer mix polyolefin outer jacket, cross-linking radiation.
6, according to the described flame-proof power cable for track traffic preparation method of claim 5, it is characterized in that packing heat insulation oxygen barrier layer and be the wrapped non-hygroscopic glass fiber tape of elder generation, after extrude the oxygen barrier flame-retardant layer, wrapped again non-hygroscopic glass fiber tape, vertical copper-clad band and embossing, wrapped non-hygroscopic glass fiber tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100378232A CN100347792C (en) | 2005-02-24 | 2005-02-24 | Flame-proof power cable for track traffic and process for manufacture |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100378232A CN100347792C (en) | 2005-02-24 | 2005-02-24 | Flame-proof power cable for track traffic and process for manufacture |
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| CN1655287A CN1655287A (en) | 2005-08-17 |
| CN100347792C true CN100347792C (en) | 2007-11-07 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100727207B1 (en) * | 2006-02-24 | 2007-06-13 | 주식회사 엘지화학 | Cross-linked polyethylene having excellent inhibition of sweat-out and insulation properties |
| CN102324274A (en) * | 2011-07-20 | 2012-01-18 | 广东中德电缆有限公司 | Strong-overload super-flexible crosslinked environment-friendly cable |
| CN102982879A (en) * | 2012-11-28 | 2013-03-20 | 安徽埃克森科技集团有限公司 | High-temperature-resistant and high-voltage-resistant power cable |
| CN102982886A (en) * | 2012-11-28 | 2013-03-20 | 安徽埃克森科技集团有限公司 | Irradiation-crosslinked flame-retardant power cable and manufacturing method thereof |
| CN103035335A (en) * | 2012-11-29 | 2013-04-10 | 安徽徽宁电器仪表集团有限公司 | High-temperature and high-voltage power cable |
| CN104269218A (en) * | 2014-10-17 | 2015-01-07 | 国家电网公司 | Water-tree-prevention ultrahigh-voltage cross linked polyethylene insulating power cable |
| CN106128598B (en) * | 2016-07-07 | 2018-04-27 | 扬州曙光电缆股份有限公司 | A kind of rail traffic vehicles environment-friendly cable |
| CN108586883A (en) * | 2018-05-15 | 2018-09-28 | 温州网牌电线电缆有限公司 | Double-layer coextrusion insulated irradiation crosslinking halogen-free low-smoke fireproof cable and preparation method thereof |
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Patent Citations (7)
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| CN1655287A (en) | 2005-08-17 |
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