CN102800399B - Halogen-free low-smoke high-flame-resistance control cable and manufacturing method thereof - Google Patents

Abstract

The invention relates to the field of control signals, in particular to a halogen-free low-smoke high-flame-resistance control cable. The cable sequentially comprises a plurality of stranded conductors and insulation layers and cabling wrapping layers, copper wire woven shielding layers, oxygen isolation band layers and sheath layers which are arranged outside the conductors from inside to outside, wherein the cabling wrapping layers are halogen-free low-smoke flame-resistance non-woven cloth band layers and polypropylene band layers. The halogen-free low-smoke high-flame-resistance control cable is essentially characterized in that the oxygen isolation layers made of oxygen isolation material are arranged between the copper wire woven shielding layers and the sheath layers; since the band materials made of the oxygen isolation material are high in flame resistance and a large quantity of flame resistance inorganics such as AI(OH)3 are coated on two sides of the oxygen isolation band materials, when the cable is combusted by open fire, a large amount of water can be separated out to reduce the environment temperature in combustion,an infusible and incombustible aluminum oxide hard shell is formed and used for isolating contact between an insulation organic and the outside air, so as to greatly improve the flame resistance level. The halogen-free low-smoke high-flame-resistance control cable can meet the performance requirements for the first-class low-smoke halogen-free flame-resistance control cables.

Description

Halogen-free low-smoke high-flame control cables and preparation method thereof

Technical field

The present invention relates to control signal field, be applicable to crosslinked 50-60HZ, nontoxic, the low cigarette of Halogen corrosion-free (nuisanceless cable) flame-proof control cable that rated voltage 750V and following control monitoring occasion are used.

Background technology

Raising day by day along with people's safety and environmental protection consciousness, the use of halide-free low-smoke fireproof cable is more and more extensive, although this type of cable is the manufacturing history of existing recent two decades at home, but once there is no country and industry standard, therefore all more chaotic at aspects such as name of product, model, specification requirement and test methods.For this reason, within 2005, issued fire-retardant and fire-resistant wire and cable general rule > > (hereinafter to be referred as the < < general rule > >) national standard of < <, be intended to the production testing behavior of this type of cable of standard, but, because most enterprises in industry does not have checkout gear, development cost is higher, when dispatching from the factory, product approval whether reaches corresponding requirements also just unknown, add user and most quality inspection organization also without check discriminating power, in fact in the market the quality of most halide-free low-smoke fireproof cables does not pass a test, structure is multifarious, the hidden danger existing is more.

Within 2011, new edition < < electric wire production licence detailed rules for the implementation > > has newly added LSOH anti-flaming series products in plastic insulation control cables unit, this series products is included production licence management in, and its importance and the popularity of use are described.

Category-A low-smoke non-halogen flame-retardant control cables that development and production meet < < general rule > > performance requirement be take as research and development target in our company, chooses WDZA-KYJYP 450/750V 7*2.5 control cables and carries out the development of structure and technique.We produce product according to following related art scheme trial-production:

(1) conductor: the 1 class conductor that conductor adopts GB/T 3956-2008 to require,

(2) insulating material: adopt organosilane crosslinked polyethylene insulation material,

(3) stranding is wrapped: adopt LSOH anti-flaming nonwoven fabric belts, oxygen index reaches more than 35%, three layers

Overlapping wrapped, Duplication control range is 50% ~ 55%,

(4) proof copper-wire braided shielding: adopt the annealed copper silk braid shielded that 24 ingot external diameters are 0.15mm,

(5) sheath material: adopt halogen-free and low-smoke flame-retardant polyolefin sheathed material, oxygen index reaches more than 35%.

The product of producing by above technical scheme, according to GB/T18380.33, GB/T17650.2 and GB/T17651.2, carry out type approval test, result is low smoke, zero halogen performance, met < < general rule > > requirement, but fire resistance is not passed through.

We think that the oxygen index of cable nonmetallic materials of this burning grade must improve, and There is nothing one can do on insulation and sheath material by the cable after burning is made to dissection and analysis.We are according to the combustibility of category-A halide-free low-smoke fireproof cable, it around cable fire three elements, is the combustion mechanism of temperature, combustible and oxygen, a kind of new construction of cable oxygen barrier layer has been proposed, to making an adjustment on aforesaid structure and material, after testing, knot synthetic fibre is that LSOH anti-flaming can meet < < general rule > > requirement to the product of producing.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of category-A halogen-free low-smoke high-flame control cables of the < of meeting < general rule > > performance requirement; The present invention also provides the manufacture method of halogen-free low-smoke high-flame control cables.

It is as follows that the present invention solves the problems of the technologies described above the technical scheme of taking: a kind of halogen-free low-smoke high-flame control cables, this cable comprises from inside to outside successively: insulating barrier, stranding lapping layer, proof copper-wire braided screen, oxygen barrier belt, the restrictive coating of the several conductors that twist together and every conductor outside.

Stranding lapping layer is LSOH anti-flaming nonwoven fabrics belt and polypropylene belt.

A manufacture method for halogen-free low-smoke high-flame control cables, step is as follows:

(a) conductor: be ready to the conductor that outer surface has insulating barrier; The 1 class conductor that conductor adopts GB/T 3956-2008 to require, insulating barrier adopts organosilane crosslinked polyethylene insulation material;

(b) stranding lapping layer: by several cores, it is regular stranded to be that several outsides have the conductor of insulating barrier, intermediate space is very little of adding packing material, can guarantee cable core rounding completely, the wrapped LSOH anti-flaming nonwoven fabrics belt in cable core outside after stranded, the oxygen index of LSOH anti-flaming nonwoven fabric belts reaches more than 35%, and three plies are wrapped, Duplication control range 40%～50%; The wrapped polypropylene belt again in the outside of LSOH anti-flaming nonwoven fabrics belt, polypropylene belt is that a ply is wrapped, Duplication 20%; LSOH anti-flaming nonwoven fabrics belt and polypropylene belt form stranding lapping layer;

(c) cover coppered wire woven shield: adopt the annealed copper silk braid shielded cover that 24 ingot external diameters are 0.15mm to wrap in polypropylene belt outside; Make proof copper-wire braided screen;

(d) wrapped oxygen barrier belt: employing low-smoke bittern-free highly fire-proof glass fibre oxygen barrier band is wrapped, and the oxygen index of low-smoke bittern-free highly fire-proof glass fibre oxygen barrier band reaches 45% in polypropylene belt outside, and double-layer overlapping is wrapped, Duplication control range 40%～50%; Make oxygen barrier belt;

(e) cover jacket layer: the outer surface cover jacket layer of oxygen barrier belt, restrictive coating adopts halogen-free and low-smoke flame-retardant polyolefin sheathed material, and oxygen index reaches more than 35%.

Substantive features of the present invention are between proof copper-wire braided screen and restrictive coating, increase the oxygen barrier layer being comprised of oxygen barrier material.When cable is met naked light burning, the band of oxygen barrier material has high flame retardant on the one hand, on the other hand a large amount of AI (OH) of oxygen barrier band coated on both sides ₃etc. fire-retardant inorganic matter, during burning, can separate out large quantity of moisture to reduce ambient temperature, and form molten aluminium oxide duricrust not firing, to completely cut off contacting of insulation organic substance and outside air, finally make burned flame reach from the object of putting out, thereby greatly improved fire-retardant rank, can reach A level flame retardant level.Next adopts its insulation of cable of oxygen barrier layer structure can adopt medium-sized insulating material completely, has avoided because adding inorganic fire retardant, antismoke agent to cause bad impacts such as electrical properties.

The present invention is without the gap between stranding lapping layer and the insulating barrier of conductor, and the gap between each insulating layer of conductor adds packing material.

According to above-mentioned design, we have manufactured experimently WDZA-KYJYP 450/750V 7*2.5 control cables, and conductor is seven.According to correlation test standard, we have carried out strict detection ourselves, and result is that LSOH anti-flaming can meet < < general rule > > requirement.

In November, 2011, we are sent to national electric wire product quality supervision inspection center (Wuhan) by the WDZA-KYJYP 450/750V 7*2.5 cable of up-to-date trial-production and do pattern detection, and after tested, result is as follows:

From above detection data, reach a conclusion, low-smoke non-halogen flame-retardant performance of the present invention meets GB/T19666-2005 standard completely, design and selecting of material that this new structure is described are reasonably, can meet the performance requirement of category-A low-smoke non-halogen flame-retardant control cables completely.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

In figure: 1-conductor, 2-insulating barrier, 3-stranding lapping layer, 301-LSOH anti-flaming nonwoven fabrics belt, 302-polypropylene belt, 4-proof copper-wire braided screen, 5-oxygen barrier belt, 6-restrictive coating.

Embodiment

As shown in Figure 1: a kind of halogen-free low-smoke high-flame control cables, this cable comprises from inside to outside successively: insulating barrier 2, stranding lapping layer 3, proof copper-wire braided screen 4, oxygen barrier belt 5, the restrictive coating 6 of seven conductors 1 that twist together and every conductor outside.Stranding lapping layer 3 is LSOH anti-flaming nonwoven fabrics belt 301 and polypropylene belt 302.Polypropylene belt also can replace with polyester band.

A manufacture method for halogen-free low-smoke high-flame control cables, step is as follows:

(a) conductor: be ready to the conductor 1 that outer surface has insulating barrier 2; The 1 class conductor that conductor adopts GB/T 3956-2008 to require, in order to guarantee that 90 ℃ of insulation resistances of insulated wire cores meet GB/T9330.1-2008 requirement, insulating barrier adopts organosilane crosslinked polyethylene insulation material;

(b) make stranding lapping layer: by seven cores, the conductor that seven outsides have insulating barrier is regular stranded, the wrapped LSOH anti-flaming nonwoven fabrics belt 301 in cable core outside after stranded, the oxygen index of LSOH anti-flaming nonwoven fabric belts reaches more than 35%, three plies are wrapped, Duplication control range 40%～50%; The wrapped polypropylene belt 302 again in the outside of LSOH anti-flaming nonwoven fabrics belt, polypropylene belt is that a ply is wrapped, Duplication 20%; LSOH anti-flaming nonwoven fabrics belt 301 forms stranding lapping layer with polypropylene belt 302;

(c) cover coppered wire woven shield: adopt the annealed copper silk braid shielded cover that 24 ingot external diameters are 0.15mm to wrap in polypropylene belt outside; Make proof copper-wire braided screen 4;

(d) wrapped oxygen barrier belt: employing low-smoke bittern-free highly fire-proof glass fibre oxygen barrier band is wrapped, and the oxygen index of low-smoke bittern-free highly fire-proof glass fibre oxygen barrier band reaches 45% in polypropylene belt outside, and double-layer overlapping is wrapped, Duplication control range 40%～50%; Make oxygen barrier belt;

(e) cover jacket layer: the outer surface cover jacket layer 6 of oxygen barrier belt, restrictive coating adopts halogen-free and low-smoke flame-retardant polyolefin sheathed material, and oxygen index reaches more than 35%.

Claims (1)

1. a manufacture method for halogen-free low-smoke high-flame control cables, is characterized in that step is as follows:

(a) conductor: be ready to the conductor that outer surface has insulating barrier; The 1 class conductor that conductor adopts GB/T 3956-2008 to require, insulating barrier adopts organosilane crosslinked polyethylene insulation material;

(b) stranding lapping layer: by several cores, it is regular stranded to be that several outsides have the conductor of insulating barrier, the wrapped LSOH anti-flaming nonwoven fabrics belt in cable core outside after stranded, the oxygen index of LSOH anti-flaming nonwoven fabric belts reaches more than 35%, three plies are wrapped, Duplication control range 40%～50%; The wrapped polypropylene belt again in the outside of LSOH anti-flaming nonwoven fabrics belt, polypropylene belt is that a ply is wrapped, Duplication 20%; LSOH anti-flaming nonwoven fabrics belt and polypropylene belt form stranding lapping layer;

(c) cover coppered wire woven shield: adopt the annealed copper silk braid shielded cover that 24 ingot external diameters are 0.15mm to wrap in polypropylene belt outside; Make proof copper-wire braided screen;

(d) wrapped oxygen barrier belt: employing low-smoke bittern-free highly fire-proof glass fibre oxygen barrier band is wrapped, and the oxygen index of low-smoke bittern-free highly fire-proof glass fibre oxygen barrier band reaches 45% in polypropylene belt outside, and double-layer overlapping is wrapped, Duplication control range 40%～50%; Make oxygen barrier belt;

(e) cover jacket layer: the outer surface cover jacket layer of oxygen barrier belt, restrictive coating adopts halogen-free and low-smoke flame-retardant polyolefin sheathed material, and oxygen index reaches more than 35%.

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