CN201698813U

CN201698813U - Irradiation cross-linked polyethylene insulation low-smoke halogen-free flame-retardant cable

Info

Publication number: CN201698813U
Application number: CN2010201603554U
Authority: CN
Inventors: 樊建浩
Original assignee: Wuxi Great Wall Electric Wire & Cable Co Ltd
Current assignee: Wuxi Great Wall Electric Wire & Cable Co Ltd
Priority date: 2010-04-14
Filing date: 2010-04-14
Publication date: 2011-01-05
Anticipated expiration: 2020-04-14

Abstract

The utility model discloses an irradiation cross-linked polyethylene insulation low-smoke halogen-free flame-retardant cable, which comprises a conductor. A low-smoke halogen-free flame-retardant polyethylene insulation layer is extruded outside the conductor to form wire cores, a plurality of the wire cores are stranded, flame-retardant fillers are filled in clearances among the wire cores, and a low-smoke halogen-free flame-retardant polyethylene sheath is extruded on the outsides of the stranded wire cores and the flame-retardant fillers. The irradiation cross-linked polyethylene insulation low-smoke halogen-free flame-retardant cable adopts low-smoke halogen-free flame-retardant polyethylene as the insulation layer and the sheath, does not contain halogen, and does not generate harmful gas and corrosive gas.

Description

IXPE insulating low-smoke halogen-free flame retardant cable

Technical field

The utility model relates to power cable, specifically is a kind of IXPE insulating low-smoke halogen-free flame retardant cable.

Background technology

In the fire incident, the fire that electric wire causes can not be ignored at present.According to incompletely statistics, in the fire of China's generation in 1998, account for more than 35% because of electric wire is caused, in the fire fatality personnel, have 2nd/3rd, because the toxic gas that discharges when sucking the electric wire burning and death by suffocation, how to stop the burning of electric wire, even gone back LSZH by the naked light burning, this is electric wire manufacturing one a big problem.

Since the seventies in 20th century, the developments of many country beginning flame-retardant electric wire and cables, people have at first expected carrying out with the material that contains halogen fire-retardant at the beginning, have good flame because contain the material of halogen.This type of material is divided into two kinds: a kind of is that the matrix resin of material contains halogen, as polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE) etc.; Another kind of matrix resin is not halogen-containing, as polyethylene (PE) etc., adds bromo biphenyl ether, chlorinated paraffin wax, preceding a kind of title has halogen fire-retardant, and the low halogen of a kind of title in back is fire-retardant, but the time there is the height highly toxic drawback of being fuming in these flame-retardant electric wire and cables in burning, when fire takes place, and generation bromination dioxin.Trapped personnel and even fire fighter very easily suck this type of poisonous Halogen gas and the injures and deaths of suffocating, and cause the secondary disaster of fire.In addition, polyvinyl chloride (PVC) insulation also is quite serious pollutant sources, and it can produce public hazards materials such as a large amount of smog, dioxin, lead, halogen when manufacturing, use and waste treatment.

The utility model content

Technical problem to be solved in the utility model provides the IXPE insulating low-smoke halogen-free flame retardant cable of a kind of safety, environmental protection.

IXPE insulating low-smoke halogen-free flame retardant cable described in the utility model, it comprises conductor, outside conductor, extrude the low-smoke non-halogen flame-retardant polyethylene layer and constitute core, some cores twist mutually, fire-retardant filler is filled in gap between each core, extrudes the low-smoke non-halogen flame-retardant pe sheath outside core after stranded and the fire-retardant filler.

Advantage of the present utility model:

1, adopts the low-smoke non-halogen flame-retardant polyethylene as insulating barrier and sheath, do not contain halogen, do not produce pernicious gas and corrosive gas.

The amount of being fuming is few when 2, burning, and during fire, for guaranteeing to be unfamiliar with the chance that on-the-spot personnel have escape, visual range must not be lower than 15M, and the visual range during the normal cable burning is 5-8M only, and this index of environment-friendly cable is higher than 15M far away.

3, has better fire resistance.No matter advanced technologies means such as applying electronic accelerator cross-linking radiation, environment-friendly cable aspect indexs such as temperature resistant grade, ageing-resistant, mechanical performance, fire resistance, are compared normal cable and are all improved a lot.

4, heavy metal such as not leaded does not contain environmental hormone, not contaminated soil.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

As shown in Figure 1, IXPE insulating low-smoke halogen-free flame retardant cable described in the utility model, it comprises conductor 1, outside conductor, extrude low-smoke non-halogen flame-retardant polyethylene layer 2 and constitute core, some cores twist mutually, fire-retardant filler 3 is filled in gap between each core, extrudes low-smoke non-halogen flame-retardant pe sheath 4 outside core after stranded and the fire-retardant filler 3.

Low-smoke halogen-free polyolefin is to be matrix with the polyethylene, to be closed a large amount of magnesium hydroxides or the aluminium hydroxide that polymers activated by the EVA ethylene-vinyl acetate mediates in the polyethylene matrix, utilize when hydroxide is burned to be heated, resolve into metal oxide and water, this reaction is the endothermic reaction.Fire-retardant principle is as follows: be decomposition reaction when hydroxide is burned, this reaction is the endothermic reaction, absorbs a large amount of heats in the surrounding air, has reduced the temperature of combustion site, and this is one of fire retardant mechanism; The hydrone that generates also absorbs a large amount of heats, and this is two of a fire retardant mechanism; The metal oxide crust that produces has stoped oxygen to contact again with organic, and this is three of a fire retardant mechanism.So low-smoke halogen-free polyolefin is to adopt the heat absorption and the method for metal oxide oxygen barrier to carry out fire-retardant.Hydroxide as fire retardant is called alkali again, and its characteristic is to absorb airborne moisture easily, promptly is called deliquescence.The result of deliquescence is that the specific volume resistance of insulating barrier descends significantly, can be reduced to 0.1M Ω/km by original 17M Ω/km.How to stop the generation of deliquescence? having only matrix--polyolefinic molecular structure is changed, and forms the deliquescence phenomenon thereby form compacted zone to stop airborne hydrone to combine with fire retardant hydroxide, and people claim that this is crosslinked.

Crosslinked mode is divided into two big classes, i.e. chemical crosslinking and physical crosslinking.And chemical crosslinking is divided into two kinds of dry cross-linking and warm water crosslinkings.The method of dry cross-linking is in temperature reaches 300-400 ℃ gases at high pressure, makes the sub polyethylene subchain crosslinked through the regular hour.Under this situation, hydroxide has been decomposed into metal oxide and water, so crackle and bubble will appear in cable surface, so the method for dry cross-linking is not useable for the low smoke and zero halogen material.The method of warm water crosslinking is to place 90 ℃ warm water to soak 5 to 7 hours electric wire, and under this situation, hydroxide will absorb a large amount of moisture content, cause insulation resistance to descend, and directly have influence on the combination property of cable.Physical crosslinking claims cross-linking radiation again, is to utilize electronics to quicken the high-energy electron line of growing up to be a useful person and producing, and bombardment insulating barrier and sheath interrupt macromolecular chain, and each breakpoint that is interrupted is called free radical.The free radical instability, will reconfigure each other, reconfigure the back and become three-dimensional netted molecular structure by original chain molecule structure and form crosslinkedly, this crosslinking method had not only had high temperature but also anhydrous, can make polyolefin crosslinked, not influence fire resistance and electric property again.

Claims

1. IXPE insulating low-smoke halogen-free flame retardant cable, it is characterized in that: it comprises conductor (1), outside conductor, extrude low-smoke non-halogen flame-retardant polyethylene layer (2) and constitute core, some cores twist mutually, fire-retardant filler (3) is filled in gap between each core, extrudes low-smoke non-halogen flame-retardant pe sheath (4) outside core after stranded and the fire-retardant filler (3).