CN1322519C

CN1322519C - Environment protection high flame resistance fire control type cable

Info

Publication number: CN1322519C
Application number: CNB2005100319605A
Authority: CN
Inventors: 毛炯明; 陈善求; 周国新
Original assignee: CHANGSHA JINLONG CABLE Co Ltd
Current assignee: CHANGSHA JINLONG CABLE Co Ltd
Priority date: 2005-08-03
Filing date: 2005-08-03
Publication date: 2007-06-20
Anticipated expiration: 2025-08-03
Also published as: CN1719551A

Abstract

The present invention relates to a highly flame-retardant, environmental-protective, fire-fighting cable, which is composed of insulated conductors of single core or multi-core conductors respectively wrapped by an XLPE insulation layer. Asbestos based inorganic fillers are filled among the insulated conductors. The bundle of the insulated conductors is orderly wrapped by a belting layer, an oxygen-isolation layer, a steel belt layer and an outer protection layer, wherein the belting layer is a windingly lapping belting layer which is formed by the adhesion of a base band of non-alkali glass fiber and hydrated hydroxide; the steel belt layer is a galvanized steel strip layer of double open lapping; the oxygen-isolation layer and the outer protection layer are composed of macromolecular compounds which are a mixture of a coupling agent and hydrated hydroxide by using olefin polymer as a base. The present invention has the advantages that the present invention enhances flame-retardant grade to grade A, increases the mechanical properties, and is not easy to damage and crack, and more importantly, lessens smog and poisonous gas during burning so as to be beneficial to environmental protection, and benefits fire-fighting rescue work in a fire for smog transmittance reaching over 80 percent and the distance of naked sight reaching 7m.

Description

Environment protection high flame resistance, fire control type cable

Technical field:

The present invention relates to a kind of cable, particularly a kind of environment protection high flame resistance, fire control type cable.

Background technology:

According to the data introduction of fire department, in the fire that China takes place, because of the electric fire that causes accounts for about half.In electrical fire, because the aging and overload of electric wire uses the fire that causes to account for larger proportion, simultaneously, flammable insulation and sheath material in the electric wire that ignites during because of fire cause fire incident further to enlarge.The toxic gas that the burning of wire cable insulating and sheath material gives out can cause a large amount of casualties, and hinders fire fighter's fire extinguishing.

At present, China's plastic insulated cable mostly adopts polyvinyl chloride insulation and sheath material, there is following defective in the cable of prior art, the one, the light transmittance of the smog that sends is below 15% during the pvc material burning, the people is in the smog of this concentration, its naked apparent distance only is about 2m, and low visibility has a strong impact on scene of fire evacuating personnel and rescue.Simultaneously, hydrogen chloride, dioxin etc. take place to contain in the smog and are corrosive in a large number and poisonous gas in pvc material when burning institute, and scene of fire personnel and critical facility are caused very big harm, cause so-called " secondary public hazards ", and its fire-retardant rank is low, only is the C level.

Summary of the invention:

The objective of the invention is to overcome the above-mentioned disadvantage of prior art, a kind of raising cable-flame retardant performance is provided, and when the fire cable burns, reduce smog, improve the naked apparent distance, and the harm of toxic gas when reducing burning, improve the fire-fighting environment of requiring assistance.

Technical solution of the present invention is a kind of environment protection high flame resistance, fire control type cable, by single core or multi-core conductor separately outsourcing insulation become insulated electric conductor, outer successively belting layer, steel belt layer and the outer jacket of covering of single core insulation conductor or multicore insulated electric conductor bundle integral body, the low-smoke bittern-free highly oxygen barrier layer is arranged between belting layer and the steel belt layer, it by polyolefin polymer be base by coupling agent add smoke density Dm that the hydroxide hydrate blend formed, had flame method or flameless procedure test respectively≤40 or 200, oxygen index OI 〉=54, the macromolecule mixture of halogen-containing element not; Insulating barrier is the crosslinked polyetylene insulated layer of heatproof 90 degree-125 degree, low smoke and zero halogen; Belting layer is by smoke density Dm≤100 that alkali-free glass wool base band and hydroxide hydrate are bonded, flameless procedure is tested, the lap wound band of oxygen index OI 〉=55; Outer jacket is that base forms, has the smoke density Dm difference≤39 or 100 of flame method or flameless procedure test, the macromolecule mixture of oxygen index OI 〉=35 by the blend of coupling agent interpolation hydroxide hydrate by polyolefin polymer.Filler is arranged between insulated electric conductor, and filler is oxygen index OI 〉=100, is the inorganic matter of base with asbestos.Steel belt layer is the steel belt layer that overlapping rate is not less than 15% the wrapped structure in double-deck gap.

To be it compare with the traditional polyvinyl chloride cable of prior art advantage of the present invention, it has improved fire-retardant rank, reach the A level, and improved mechanical performance, cracky cracking not during use, smog and the toxic gas that importantly discharges during its burning is less simultaneously, environmental, the smog light transmittance can reach more than 80%, and the naked apparent distance can reach 7m, is convenient to fire-fighting, rescue work during breaking out of fire.

Description of drawings:

Fig. 1 is environment protection high flame resistance of the present invention, fire control type cable radial cross-section;

Fig. 2 is environment protection high flame resistance of the present invention, fire control type cable axial arrangement figure;

Embodiment:

The present invention further specifies as follows in conjunction with specific embodiments referring to accompanying drawing:

A kind of environment protection high flame resistance, fire control type cable referring to accompanying

drawing

1,2, by the three core conductors 1 crosslinked polyetylene insulated layer of outsourcing 2 separately, constitute insulated electric conductor, and conductor 1 adopts the anaerobic cathode copper, and conductor cores is pressed with 14/2.57 lead is stranded, and the conductor cores cross section is 70mm ², insulating barrier 2 is heatproof 95 degree-125 degree, low smoke and zero halogen, crosslinked polyethylene insulation material, insulating layer thickness 1.10mm.Smog that produces during its burning and toxic gas are seldom, fill with asbestos the filler 3 of the inorganic matter formation that is base between the three core insulation conductors, as the asbestos gasket for packing, its not halogen-containing element, oxygen index OI 〉=100, burning does not produce smog and poison gas, the size of asbestos gasket for packing and quantity are determined according to cable conductor 1 size and core number, select the asbestos cord of diameter phi 2-φ 22mm, quantity does not wait, to keep conductor cable core rounding, closely be as the criterion, the effect of filler 3 is the full circle degree that keeps cable on the one hand, and the opposing party is to improve the comprehensive oxygen index of whole cable, to reach the effect that improves anti-flammability.

Outside three core insulation conductor bundle integral body, cover belting layer 4, oxygen barrier layer 5, steel belt layer 6, outer jacket 7 successively.

Belting layer 4 is low-smoke bittern-free highly fire-proof belting layers, and this is the band that is bonded by alkali-free glass wool base band and hydroxide hydrate, with the number of plies of 1-2 layer and closely wrapped equably on cable core greater than 15% Duplication.Every layer of band thickness is between 0.1-0.2mm, and width is doubly chosen according to the 2-3 of conductor assembly outer diameter.It does not contain any halogens, and combustion fumes density D m≤100, oxygen index OI 〉=55 of flameless procedure test discharge gas acidity PH 〉=4.3, conductivity≤10us/mm.

Oxygen barrier layer 5 is low-smoke bittern-free highly fire-proof oxygen barrier layers, and it is by being base with the polyene polymer, adds the macromolecule mixture that a large amount of hydroxide hydrates forms with physical blending by coupling agent, extrudes closely to be coated on the cable conductor by plastic extruding machine to constitute.Its oxygen index OI reaches more than 54, does not contain any halogens, and smoke density Dm respectively≤40 or 200 when the burning of flame method or flameless procedure test was arranged, the gas of release; Acidity PH 〉=4.3, conductivity≤10us/mm.It is between the 1.2-3.0mm that this layer extrudes thickness, and axially reaching of flame radially spread in the time of can effectively deadening cable fire.

Steel belt layer 6 is galvanized steel belts, and it is with by galvanized steel strip cold rolling or charged plating of hot-rolled steel section or the certain thickness zinc layer of dip-coating, adopts that double-deck gap is wrapped to be constituted on the low-smoke bittern-free highly fire-proof oxygen barrier layer 5 of cable.The wrapped upper and lower interlayer of galvanized steel strip is put up each other, and the rate of putting up is not less than 15%.The thickness of galvanized steel strip is between 0.2-0.8mm, and width is doubly chosen according to the 0.5-2 of conductor assembly outer diameter, and this layer plays radiating and cooling when mainly being cable fire, with the effect that stops flame radially to spread.

Outer jacket 7 is low smoke and zero halogen outer jackets, it is by being base with the polyolefin polymer material, add the macromolecule mixture that suitable hydroxide hydrate forms with physical blending by coupling agent, extrude closely to be coated on equably on the cable galvanized steel belt 6 by plastic extruding machine and constitute, its oxygen refers to that OI reaches more than 35, do not contain any halogens, smoke density Dm respectively≤39 or 190 when the burning of flame method or flameless procedure test was arranged, the gas of release; Acidity PH 〉=5, conductivity≤2us/mm.It is between the 1.8-3.0mm that this layer extrudes thickness, and when this layer can intercept cable fire effectively, flame axially reached and radially spreads.

The present invention adopts mineral-filled rope 3 that all spaces in the cable core are tamped, and can prevent cross-ventilation and delay heat transfer rate; Adopt low-smoke bittern-free highly fire-proof band 4 further to wrap cable core; Extrude high flame retardant oxygen barrier layer 5 on it, the steam evaporation that produces when burning by this grate firing is taken away the combustion heat and is reduced flame temperature; Adopt galvanized steel belt 6 armourings, the cable conductor tightness is further improved on the one hand, and the steel band heat absorption can be taken away a large amount of heats to reduce flame temperature on the other hand; Steel belt layer 6 outsides extrude special low smoke and zero halogen outer jacket 7 when when burning discharges steam and take away heat, form the closely knit duricrust of one deck, effectively deaden oxygen, stop radially spreading of scorching flame, adopt said structure, the harshest category-A test requirements document of burning test that this type cable satisfies bunched cables fully.All organic materials all adopt the low-smoke zero-halogen low-toxicity material in addition, thereby make whole cable satisfy the requirement of low cigarette, Halogen, low toxicity, high flame retardant.

Environment protection high flame resistance of the present invention, fire control type cable are a kind of occasions such as skyscraper, nuclear power station, subway that are applicable to, require comparatively harsh power consumption cable for the fire resistance of cable and fire-fighting, the fire resistance of cable meet and surpass GB/T18380.2-2001 " cable under flame condition burning test the 3rd part bunched cables or the burning test method of cable " the harshest category-A test requirements document in (equivalent IEC 60332-3:1992).Cable fire discharges gas meets this standard according to GB/T17650-1998 (discharging the test method of gas when taking from the material combustion of cable or optical cable) regulation: pH value: 〉=4.3, and conductivity :≤10us/mm, HCL content :≤0.5%.The regulation that flue gas that cable fire produces and poison exponent meet fire-retardant one-level IA class cable among the GA 306-2001 " fire-retardant and fire-resisting cable: plastic insulation fire-retardant and fire-resisting cable classification and requirement ": flue gas toxity (concentration :) 〉=12.4mL/L, smoke density (minimum light transmittance) 〉=80%.

In sum, the advantage of environment protection high flame resistance of the present invention, fire-fighting type cable is the polychlorostyrene traditional with prior art The ethene insulated cable is compared, and it has improved fire-retardant rank, reaches the A level, and has improved mechanical performance, uses The time cracky cracking not, the smog and the toxic gas that importantly discharge during its burning simultaneously are less, environmental, The smog light transmittance can reach more than 80%, and the naked apparent distance can reach 7m, is convenient to fire-fighting, rescue work during breaking out of fire.

Claims

1, a kind of environment protection high flame resistance, fire control type cable, by single core or multi-core conductor separately outsourcing insulation become insulated electric conductor, outer successively belting layer, steel belt layer and the outer jacket of covering of single core insulation conductor or multicore insulated electric conductor bundle integral body, it is characterized in that the low-smoke bittern-free highly oxygen barrier layer is arranged between belting layer and the steel belt layer, it by polyolefin polymer be base by coupling agent add smoke density Dm that the hydroxide hydrate blend formed, had flame method or flameless procedure test respectively≤40 or 200, oxygen index OI 〉=54, the macromolecule mixture of halogen-containing element not; Insulating barrier is the crosslinked polyetylene insulated layer of heatproof 90 degree-125 degree, low smoke and zero halogen; Belting layer is by smoke density Dm≤100 that alkali-free glass wool base band and hydroxide hydrate are bonded, flameless procedure is tested, the lap wound band of oxygen index OI 〉=55; Outer jacket is that base forms, has the smoke density Dm difference≤39 or 100 of flame method or flameless procedure test, the macromolecule mixture of oxygen index OI 〉=35 by the blend of coupling agent interpolation hydroxide hydrate by polyolefin polymer.

2, environment protection high flame resistance according to claim 1, fire control type cable is characterized in that filler is arranged between insulated electric conductor, and filler is oxygen index OI 〉=100, is the inorganic matter of base with asbestos.

3, environment protection high flame resistance according to claim 1, fire control type cable, the steel band that it is characterized in that steel belt layer is a galvanized steel strip, steel belt layer is the steel belt layer that overlapping rate is not less than 15% the wrapped structure in double-deck crack.