JPS5996606A - Refeactory wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire-resistant electric wire used for the purpose of securing various power sources in order to minimize human and material losses in the event of a fire.

Conventional fire-resistant electric wires include those in which an inorganic insulating tape layer is provided on a conductor, a rubber or plastic insulator is extruded on the conductor, and a protective coating layer is further extruded on the insulating tape layer. As the electric wires have this divine structure, the thickness of the extruded rubber or plastic coating layer increases as the voltage and capacity increase, and in the event of a fire, this rubber or plastic layer burns, causing the spread of fire and the generation of smoke. becomes a factor that increases damage. On the other hand, in the case of fireproof wires that have a fireproof layer on the outer periphery of the rubber or plastic insulated wire, the fireproof layer prevents the internal rubber or plastic from burning and maintains the insulation function. This is a wire with a desirable structure in order to suppress the spread of smoke and the generation of smoke. However, in quiz electric wires that have a fireproof layer on the outside, the insulation performance of the internal rubber or plastic cannot be maintained unless the fireproof layer has high insulation performance, so the fireproof layer must be very thick. In addition, fire-resistant electric wires are required to maintain secondary fire and insulation functions even under a certain degree of localized load. Conventionally, this type of external fireproofing layer has been formed by applying a foaming fireproofing paint.For the purpose of supplementing the load bearing capacity and the strength of the fireproofing paint film, a fireproofing layer was formed by painting a fireproofing paint on the lath tape. There are known methods of forming .

Fire-retardant paints use water or organic solvents as solvents, so
The drawback is that it takes a long time to dry, and if it is coated thickly, wrinkles and cracks may occur due to uneven shrinkage during drying. The disadvantage is that the fireproof layer is easily damaged by bending and vibration.

The present invention has been made in order to solve the problem described in item 1 above, and provides a fire-resistant electric wire that is less likely to be damaged during handling or installation, and is superior in fire protection areas.

The fireproof wire of the present invention is a rubber or plastic insulated wire.
A tape-wrapped layer of non-combustible 43-O1 is formed on the outer periphery of the first layer, a fire-retardant layer made of a high molecular weight polymer containing a foaming fire-retardant component is coated on top of the layer, and a second layer is coated with a fire-retardant layer made of a high-molecular polymer containing a foamable fire-retardant component. It is coated with a powder layer made of a molecular polymer composition.

As the non-flammable tape applied to the outer periphery of the above-mentioned 7-space, metal tape such as copper tape or brass tape, or inorganic tape such as glass tape, glass mica tape or asbestos tape is used. This asbestos tape is backed and reinforced with a plastic film such as polyester, and since the polyester is flammable, it is inappropriate to call it a noncombustible tape, but the asbestos layer is noncombustible, and this type of tape can also be applied to the present invention. . These non-combustible tapes suppress the deformation and flow of the rubber or plastic insulating layer/sole due to high temperatures during a fire, and in particular, equalize local loads to prevent dielectric breakdown due to abnormal local deformation of the insulating layer. It works effectively in this regard.

The fireproof layer coated on the outer periphery of the above-mentioned nonflammable tape-wrapped layer is formed by continuous extrusion of a polymer composition containing a foamable fireproofing component. Foaming fireproofing ingredients include, for example, dipentaerythritol, I-ripentaerythritol, melamine, and melamine phosphate. i Select water-soluble or insoluble substances such as ammonium solyphosphate and polyphosphoric acid amide, combine them in an appropriate ratio, and blend them into the polymer. Ethylene-
Vinyl acetate copolymer, chlorinated polyethylene, ethylene-
Ethyl acrylate copolymer, moon? Lichloroprene, chlorsul 7-onation; y-lyethylene, ethyl 1/-propylene copolymer, etc. are used. It is appropriate that the foamable fireproofing component be blended in an amount of 150 to -400 parts by weight per 100 parts by weight of the high molecular weight polymer; if the amount of the fireproofing component is too small, the foaming carbonization properties will deteriorate and the insulation and fireproofing performance will deteriorate. High molecular weight polymer compositions containing a large amount of fireproofing components generally have reduced mechanical strength, have insufficient resistance to external forces during installation and use, and are susceptible to damage. The coating thickness of the fireproof layer is adjusted to a range of about 1 to 5 depending on the foam insulation performance and required fire resistance. In the fire-resistant electric wire of the present invention, a flame-retardant layer made of a combustible polymer composition is coated on the foamed heat-insulating fire-retardant layer. This 1f fuel layer has tensile strength l, Q
Kp/mm2 or more, elongation loO% or more J:, oxygen index 22
It is preferable to use a material having the above-mentioned characteristics, which results in excellent strength and flame retardancy. Examples of flame-retardant polymer compositions include soft polyvinyl chloride, polychloroprene, chlorinated polyethylene, and Ml (with a flame retardant added), and the coating thickness is 0.5 to 1.
．． 5 cylinders is appropriate.

If the thickness of this 6j14 fuel layer is too thick, it may reduce the foam insulation performance of the fireproof layer, and since the degree of influence differs depending on the A3 quality, it should be selected and implemented as appropriate. Flame retardant layer (d
By blending Tsunopon Black, it has excellent weatherability.

The accompanying drawings are cross-sectional views of three embodiments of the present invention, and the first
The figure shows an example of m-core case, and Fig. 2 shows an example of 3-core case.
The figure is an example of a high voltage refractory wire having an inner semiconducting layer, an outer semiconducting layer, and a shielding layer.

In each figure, 1 is a conductor, 2 is an insulating layer, 4 is an extruded rubber or plastic sheath, 4 is a tape-wrapped layer of noncombustible material H, 5 is a fireproof layer, 6 is a yellow 11 flame layer, and 7 is a 3-strand twisted core. Interposition of a bulge to form a circular shape, 8 (/li internal semiconducting layer, 9
is an outer semiconducting layer, and 1o is a shielding layer formed by wrapping or braiding a metal tape.

In Figure 1, the conductor l is insulated with rubber or plastic.
7-S 3 is extruded on top of this, a non-flammable inorganic heavy or metal tape-wrapped layer 4 is provided on top of this, and a high molecular weight polymer containing a foamable fire-retardant component is extruded and coated to form a fire-retardant layer. A flame retardant layer having a tensile strength of 1.0 Kg/nun2 or more, an elongation coefficient of 100 or more, and an oxygen index of 22 or more is formed by extrusion coating 7 with a flame retardant polymer.

In the case of Fig. 2, the interposer 7 is used to make it circular and the 7-s 3 is applied, and then the tape-wrapped layer 4 of noncombustible material, the fireproof layer 5, and the flame retardant layer 7 are applied in the same manner as in the case of Fig. 1. Manufactured by sequential flow.

In the case shown in Fig. 3, semiconductive layers 8 and 9 are coated on the conductors 1 and 2 by extrusion or tape wrapping.
It is manufactured in the same manner as in FIG. 1 except that a metal shielding layer 10 is formed on the outer periphery of the semiconductive layer 9.

The fireproof electric wire obtained as described above is JIS-A-1
Results of a combustion test based on the 304 standard heating curve 3
No dielectric breakdown occurred during the 0 minute fire test and the 10 minute external pressure withstand voltage test 30 minutes later, demonstrating good fire resistance.

Note that the present invention is not limited to the electric wires and cables described in the embodiments, but can also be applied to coaxial cables, multicore communication cables, and the like.

As explained above, according to the present invention, it is possible to obtain a fire-resistant electric wire that is not easily damaged during handling or installation and has excellent fire protection performance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of a single-core refractory electric wire according to the present invention, and FIG. 2 is a cross-sectional view of a three-core refractory electric wire. FIG. 3 is an explanatory cross-sectional view of a high-voltage refractory electric wire having inner and outer semiconducting layers and a metal shielding layer. 1 is a conductor, 2 is an insulating layer, 3 is a sheath, 4 is a tape-wrapped layer of non-combustible material, 5 is a fireproof layer, 6 is a flame-retardant layer, 7 is an intervening screw that twists the three cores into a circular shape, and 8 is a 9 is an inner semiconducting layer, 9 is an outer semiconducting layer, and 1o is a metal shielding layer. $ll2il first go

Claims (1)

[Scope of Claims] 1. A tape-wrapped layer of a non-combustible material is formed around the outer periphery of a rubber or plastic insulated wire, and a fire-retardant layer and fire-retardant layer made of a high-molecular polymer composition in which a foamable fire-retardant component is sequentially added to the outer periphery. A fire-resistant electric wire characterized by being coated with a twisted layer made of a flammable polymer composition. 2. The fire-resistant electric wire according to claim 1, wherein the T-wound layer of non-combustible material is formed of a metal tape such as copper tape or brass tape. 3. The fire-resistant electric wire according to claim 1, characterized in that the tape-wrapped layer of non-combustible material is formed of an inorganic tape such as glass stage, glass mica tape, or aste tape. 4. Tape-wound layer of non-flammable material The fire-resistant electric wire according to claim 1, characterized in that the layer is formed of an inorganic tape backed and reinforced with a plastic film.5. Add 1 foam fireproofing component to the combined 100M section.
The refractory electric wire according to any one of claims 1 to 4, characterized in that the wire contains 50 to 400 parts by weight. 6. Claim 1, characterized in that the four flame-retardant layers made of a flame-retardant polymer composition have a tensile strength of 1,000 kg/mm2 or more, an elongation of 100% or more, and an oxygen index of 22 or more. The fire-resistant electric wire according to any one of items 5 to 5.