JP2022073158A - Fire-resistant cable - Google Patents

Abstract

To provide fire-resistant cable superior in productivity and cost on the production while improving fire-resistant performance and the physical properties of the cable.SOLUTION: Fire-resistant cable 1 has one or multiple insulation wire core 2. The insulation wire core 2 comprises conductor 6 and fire-resistant insulating layer 8 installed in the outside peripheral surface of the conductor 6. The fire-resistant insulating layer 8 contains, for example, ethylene-vinyl acetate copolymerization resin (EVA) and mica. In the fire-resistant cable 1, the ratio of the mica in the fire-resistant insulating layer 8 is equal to or more than 25 pts.mass and equal to or less than 80 pts.mass for 100 pts.mass of the resin, and the average particle size of the mica is equal to or smaller than 1,000 μm.SELECTED DRAWING: Figure 2

Description

The present invention relates to a refractory cable.

In theaters and department stores where a large number of people gather, evacuation guide lights are turned on for a certain period of time (time to complete evacuation) in order to safely guide the people in the hall to the emergency exit in the event of a fire. You need to keep it. The Japan Electric Wire Industry Association has established its own certification standards for refractory cables used for wiring evacuation equipment such as evacuation guide lights, and these certification standards can be used to ensure the quality of performance, structure, materials, etc. It is possible.

In the fireproof cable disclosed in Patent Document 1 below, one or a plurality of insulating wire cores are provided on a conductor, a fireproof tape portion provided on the outer peripheral surface of the conductor of the conductor, and a tape outer peripheral surface of the fireproof tape portion. The fireproof tape portion is configured to include an insulator portion, and the fireproof tape portion includes an inner layer fireproof tape portion located on the conductor side, an outer layer fireproof tape portion located on the insulator portion side, an inner layer fireproof tape portion, and the outer layer. The insulator portion is configured to include an intermediate fire-resistant portion located between the fire-resistant tape portions, and the insulator portion includes an inner layer insulator portion provided on the peripheral surface of the outer layer fire-resistant tape portion by extrusion molding and the inner layer insulator portion. The intermediate fire-resistant portion is formed by applying mica powder to the outer peripheral surface of the inner layer fire-resistant tape portion, and the inner layer insulator portion is provided with an outer layer insulating portion provided on the outer peripheral surface of the inner layer. , Consists of polyethylene kneaded with mica powder.

However, the refractory cable disclosed in Patent Document 1 has a problem that productivity is lowered and cost is high because the refractory tape portion having the above configuration is provided. In addition, the dispersibility of mica in polyethylene is poor, the ratio of mica cannot be increased, and there is room for improvement in fire resistance.

Japanese Patent No. 6412415

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fire-resistant cable having excellent productivity and cost during manufacturing while improving the fire-resistant performance and physical properties of the cable. ..

In order to achieve the above-mentioned object, the "fireproof cable" according to the present invention is characterized by the following (1) to (6).
(1)
A refractory cable (1) having one or more insulated cores (2).
The insulating wire core (2) includes a conductor (6) and a refractory insulating layer (8) provided on the outer peripheral surface of the conductor (6).
The fireproof insulating layer (8) was selected from ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate resin (EEA), ethylene-methyl acrylate resin (EMA) and ethylene-methyl methacrylate resin (EMMA). Contains one or more resins and mica
The ratio of the mica in the refractory insulating layer (8) is 25 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the resin, and the average particle size of the mica is 1000 μm or less.
(2)
In the refractory cable described in (1) above,
An insulator portion (9) is provided on the outer peripheral surface of the refractory insulating layer (8).
(3)
In the refractory cable described in (1) or (2) above,
The refractory insulating layer (8) contains the drip inhibitor in a proportion of 0.3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin.
(4)
In the refractory cable according to any one of (1) to (3) above,
The refractory insulating layer (8) contains a flame retardant in a proportion of 5 parts by mass or more and 25 parts by mass or less with respect to 100 parts by mass of the resin.
(5)
In the fireproof cable according to any one of (1) to (4) above,
The thickness of the refractory insulating layer (8) is 0.10 mm or more and 3.00 mm or less.
(6)
In the refractory cable according to any one of (1) to (5) above,
The refractory insulating layer (8) is crosslinked.

According to the refractory cable having the configuration of (1) above, the type of resin used for the refractory insulating layer, the content of the resin and mica, and the average particle size of mica are specified.
That is, the insulating fireproof layer was selected from ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate resin (EEA), ethylene-methyl acrylate resin (EMA) and ethylene-methyl methacrylate resin (EMMA). The proportion of the mica in the fireproof insulating layer is 25 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the resin, and the average particle size of the mica is contained. However, it is 1000 μm or less.
By specifying the type of resin used for the fireproof insulating layer, the content of the resin and mica, and the average particle size of mica, the conventional fireproof tape portion can be omitted, and the productivity and costability at the time of manufacturing can be improved. .. Further, since the dispersibility of the mica with respect to the resin used for the fire-resistant insulating layer is improved, the fire-resistant performance is also improved.
From the above, according to the present invention, it is possible to provide a fire-resistant cable having excellent productivity and cost during manufacturing while improving the fire-resistant performance and physical properties of the cable.

According to the refractory cable having the configuration of (2) above, since the insulating portion is provided on the outer peripheral surface of the fireproof insulating layer, appropriate adhesion between the refractory insulating layer and the insulating portion is ensured. , The deterioration of the appearance can be prevented.

According to the fire-resistant cable having the configuration of (3) above, the fire-resistant insulating layer (8) contains the drip inhibitor in a ratio of 0.3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin. , Prevents resin dripping during combustion and improves fire resistance.

According to the fire-resistant cable having the configuration of (4) above, the fire-resistant insulating layer (8) contains the flame retardant in a ratio of 5 parts by mass or more and 25 parts by mass or less with respect to 100 parts by mass of the resin. Fire resistance is improved without impairing the physical properties of.

According to the refractory cable having the configuration of (5) above, the thickness of the refractory insulating layer (8) is 0.10 mm or more and 3.00 mm or less, so that the refractory performance is improved without impairing the physical properties of the refractory cable. .. It also improves productivity.

According to the refractory cable having the configuration of (6) above, the refractory insulating layer (8) is crosslinked, so that the refractory performance is improved without impairing the physical properties of the refractory cable.

According to the present invention, it is possible to provide a fire-resistant cable having excellent productivity and cost during manufacturing while improving the fire-resistant performance and physical properties of the cable.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments described below (hereinafter referred to as "embodiments") with reference to the accompanying drawings. ..

FIG. 1 is a block diagram of the refractory cable of the present invention. FIG. 2 is a block diagram of the insulated wire core of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the refractory cable of the present invention. 2 is a block diagram of the insulated core of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line AA of FIG.

In FIG. 1, the refractory cable 1 includes two insulated wire cores 2, an interposition 3 provided on the outside when the two insulated wire cores 2 are twisted together, and a presser winding tape 4 wound from above the interposition 3. And a sheath 5 to be extruded on the presser winding tape 4. The refractory cable 1 of the present embodiment includes two insulated wire cores 2 in the configuration, but is not limited to this, and may be a cable composed of one or three.

In FIGS. 1 to 3, the insulating core 2 includes a conductor 6, a refractory insulating layer 8, and an insulating portion 9. The conductor 6 has conductivity and is formed in an appropriate size having a circular cross section. As the conductor 6, a known conductor 6 is adopted. The refractory insulating layer 8 is a characteristic portion of the insulated wire core 2.

In FIGS. 2 and 3, the refractory insulating layer 8 is provided on the outer peripheral surface of the conductor 6. Further, the insulator portion 9 may be provided on the outer peripheral surface of the refractory insulating layer 8.

The fireproof insulating layer 8 is one or more selected from ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate resin (EEA), ethylene-methyl acrylate resin (EMA) and ethylene-methyl methacrylate resin (EMMA). Includes resin and mica.

The vinyl acetate content of the EVA is more preferably 15 to 30% by mass.
The ethyl acrylate content of the EEA is more preferably 15 to 30% by mass.
The methyl acrylate content of the EMA is more preferably 15 to 25% by mass.
The methyl methacrylate content of the EMMA is more preferably 15 to 25% by mass.

The proportion of the resin in the refractory insulating layer 8 is preferably 20% by mass or more and 80% by mass or less, and more preferably 40% by mass or more and 70% by mass or less.

The mica used in the present invention can be, for example, scaly mica pieces of fine particles of soft naturally aggregated mica (phlogopite). The mica used in the present invention needs to have an average particle size of 2 μm or more and 1000 μm or less. If the average particle size is 2 μm or less, the fire resistance performance of the fire resistant insulating layer 8 deteriorates. If it exceeds 1000 μm, the tensile properties deteriorate. A more preferable average particle size of mica is 150 μm to 600 μm.

The ratio of mica in the refractory insulating layer 8 is 25 parts by mass or more and 80 parts by mass or less, and more preferably 40 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of the resin. If the proportion of the mica is less than 25 parts by mass, the fire resistance of the refractory insulating layer 8 deteriorates. On the contrary, if it exceeds 80 parts by mass, the tensile elongation rate deteriorates.

Further, the refractory insulating layer 8 can contain a drip inhibitor for improving the fire resistance performance. The drip inhibitor may be any one containing, for example, a fluorine-containing compound containing fluorine and capable of preventing resin dripping (drip) during combustion. Examples of such a fluorine-containing compound include fluorine-based resins such as polytetrafluoroethylene (hereinafter referred to as “PTFE”), polyvinylidene fluoride, and polyhexafluoropropylene. By blending the drip inhibitor, good fire resistance can be provided even if the blending amount of mica is reduced.
The drip inhibitor is preferably contained in the refractory insulating layer 8 at a ratio of 0.3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin. By blending the drip inhibitor in a ratio of 0.3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin as described above, the drip prevention effect can be exhibited without deteriorating the workability. ..
The drip inhibitor is preferably contained in the refractory insulating layer 8 at a ratio of 0.5 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of the resin.

Further, in the fireproof insulating layer 8, in order to improve the fire resistance performance, the flame retardant is preferably added in an amount of 5 parts by mass or more and 25 parts by mass or less, and more preferably 10 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the resin. It should be contained.
As the flame retardant, a flame retardant that can be used for a fireproof cable can be appropriately selected and used, and for example, a brominated ethylene bisphthalimide derivative, a bisbrominated phenylterephthalamide derivative, a brominated bisphenol derivative, and 1,2. -Organic brominated flame retardants such as bis (bromophenyl) ethane; inorganic flame retardants such as metal hydroxides such as magnesium hydroxide and aluminum hydroxide; aromatic condensed phosphoric acid esters, ammonium polyphosphate, and Phosphate flame retardants such as melamine phosphate; examples include intomescent flame retardants such as ammonium polyphosphate, melamine polyphosphate, piperazine polyphosphate, ammonium pyrophosphate, melamine pyrophosphate, and piperazine pyrophosphate.

The thickness of the refractory insulating layer 8 is preferably 0.10 mm or more and 3.00 mm or less, and more preferably 0.3 mm or more and 1.5 mm or less.

Further, the refractory insulating layer 8 may be crosslinked in order to improve the fire resistance performance.
Examples of the cross-linking agent include, but are not limited to, organic peroxides. Specifically, examples of the cross-linking agent include dicumyl peroxide (DCP), di-tert-butyl peroxide, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane, and 2,5. -Dimethyl-2,5-di- (tert-butylperoxy) hexin-3,1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert-butylperoxy) -3, 3,5-trimethylcyclohexane, n-butyl-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxy Examples thereof include isopropyl carbonate, diacetyl peroxide, lauroyl peroxide, tert-butyl cumyl peroxide and the like. These can be used alone or in combination of two or more.

The cross-linking aid is not particularly limited, and examples thereof include compounds having two or more double bonds in the molecule, specifically 1,4-butanediol diacrylate and 1,6-hexanediol diacrylate. , Neopentyl Glycol Diacrylate, Diethylene Glycol Diacrylate, Tetraethylene Glycol Diacrylate, Polyethylene Glycol Diacrylate, Tripropylene Glycol Diacrylate, and Diacrylate such as Polypropylene Glycol Diacrylate; 1,3-Butanediol Dimethacrylate, 1,6 -Dimethacrylates such as hexanediol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate; such as trimethylolpropane triacrylate, tetramethylolmethanetriacrylate, and pentaerythritol triacrylate. Triacrylate; Trimethacrylate such as trimethylolpropane trimethacrylate and trimethylolethanetrimethacrylate; Tetraacrylate such as pentaerythritol tetraacrylate and tetramethylolmethane tetraacrylate; Divinyl aromatic compounds such as divinylbenzene; Triallyl cyanurate, And cyanurates such as trimethylolisocyanurate; diallyl compounds such as diallylphthalate; triallyl compounds and the like. These can be used alone or in combination of two or more.

The amount of the cross-linking agent and the cross-linking aid used can be, for example, 0.03 to 0.10% by mass for the cross-linking agent and 0.03 to 0.10% by mass for the cross-linking aid.

The insulator portion 9 is a portion for ensuring insulation (so-called insulator), and can be provided on the outer peripheral surface of the refractory insulating layer 8. In the embodiments of FIGS. 2 and 3, the insulator portion 9 is an inner layer insulator portion 92 provided on the outer peripheral surface of the refractory insulating layer 8 by extrusion molding, and an outer layer insulator provided on the outer peripheral surface of the inner layer insulator portion 92. It is configured to include a part 94.

The inner layer insulator portion 92 and the outer layer insulator portion 94 are formed to have a predetermined thickness by extruding a resin material used for a general refractory cable. Examples of the resin material include polyolefin-based resins and vinyl chloride-based resins. The polyolefin resins include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-α-olefin copolymer, and ethylene propylene. Examples include copolymers. On the other hand, examples of the vinyl chloride resin include vinyl chloride resin.

Returning to FIG. 1, the interposition 3 is for making the refractory cable 1 have a circular cross section when twisting the two insulating wire cores 2. The interposition 3 is generally made of paper, jute, PP defibrated yarn, or the like.

As the presser winding tape 4, polyester non-woven fabric, nylon non-woven fabric, polypropylene tape, polyester tape, glass tape, paper tape, ceramic paper and the like are generally adopted.

The sheath 5 is formed to have a predetermined thickness by extruding a resin material used for a general refractory cable onto a press-wrapping tape 4. Examples of the resin material include a polyolefin-based resin and a vinyl chloride-based resin, which are the same as those of the outer layer insulator portion 16. The polyolefin resins include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-α-olefin copolymer, and ethylene propylene. Examples include copolymers. On the other hand, examples of the vinyl chloride resin include vinyl chloride resin. It should be noted that the polyolefin-based resin can be used alone or in combination of two or more. For example, by using polyethylene, which has better mechanical properties than EEA and EVA but cannot add a large amount of flame retardant, and EEA and EVA, which can add a large amount of flame retardant, in combination, mechanical characteristics and difficulty. It is possible to construct a material with good acceptance of flame retardants.

Various known members such as lubricants, flame retardants, antioxidants, fillers, processing aids, ultraviolet absorbers, pigments, antistatic agents, dispersants, etc. are provided in each member of the fireproof cable 1 of the present invention, if necessary. Additives can also be added.

The refractory cable 1 of the present invention can be manufactured by a known means, and has, for example, the following steps.

(1) A step of extruding a resin composition for forming the fire-resistant insulating layer 8 on the outer peripheral surface of the conductor 6 to form the fire-resistant insulating layer 8 (2) If necessary, the outer periphery of the fire-resistant insulating layer 8. Step of extruding the resin composition for forming the inner layer insulator portion 92 on the surface to form the inner layer insulator portion (3) (3) If necessary, the outer layer insulation on the outer peripheral surface of the inner layer insulator portion 92. Step of extruding the resin composition for forming the body portion 94 to form the outer layer insulator portion 94 In the extruding, a known single-screw extruder, twin-screw extruder, or the like is used. be able to.

Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited to the following examples.

Based on the materials and blending amounts shown in Table 1 below, each component was kneaded with a kneader at a temperature of 160 ° C. to prepare a resin composition for the refractory insulating layer 8.

A resin composition for the refractory insulating layer 8 was extruded onto a copper wire having a diameter of 2.0 mm using an extrusion molding machine to prepare various test electric wires.
The thickness of the refractory insulating layer 8 was 1.0 mm.

The following items were measured for the obtained test wire.
Tensile elongation: Measured based on JIS C3005. Pass 50% or more.
Pass / fail of fire resistance test: Those that meet the criteria for fire resistant wires (Notification 10 of the Fire and Disaster Management Agency in 1997) are passed (○), and those that do not meet are rejected (×).
The results are shown in Table 1.

* 1: EVA (UBE polyethylene V215 manufactured by Ube-Maruzen Polyethylene Co., Ltd., vinyl acetate content = 15%)
* 2: Mica (assembled mica manufactured by Okabe Mica Industry Co., Ltd., average particle size = 200 μm)
* 3: Phosphorus flame retardant (ADEKA STAB FP-2100JC manufactured by ADEKA Corporation)
* 4: Fluorine-based drip inhibitor (Metabrene A-3000 manufactured by Mitsubishi Chemical Corporation)

From the results of each example in Table 1, the fireproof insulating layer 8 is an ethylene-vinyl acetate copolymer resin (EVA), an ethylene-ethyl acrylate resin (EEA), an ethylene-methyl acrylate resin (EMA), and an ethylene-methyl methacrylate resin. The ratio of the mica in the fireproof insulating layer 8 is 25 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the resin, which contains one or more resins selected from (EMMA) and mica. A fire-resistant cable having an average particle size of mica of 1000 μm or less is manufactured because it improves physical properties such as fire resistance and tensile elongation, and it is not necessary to provide a fire-resistant tape portion as in the conventional case. Excellent in time productivity and cost.

In Comparative Example 1, since the blending amount of mica was less than the lower limit specified in the present invention, the tensile elongation rate was unacceptable and the fire resistance was also unacceptable.
In Comparative Example 2, the tensile elongation rate was unacceptable because the blending amount of mica exceeded the upper limit specified in the present invention.

The present invention is not limited to each of the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

Here, the features of the above-described embodiments of the refractory cable according to the present invention are briefly summarized and listed below (1) to (6), respectively.
(1)
A refractory cable (1) having one or more insulated cores (2).
The insulating wire core (2) includes a conductor (6) and a refractory insulating layer (8) provided on the outer peripheral surface of the conductor (6).
The fireproof insulating layer (8) was selected from ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate resin (EEA), ethylene-methyl acrylate resin (EMA) and ethylene-methyl methacrylate resin (EMMA). Contains one or more resins and mica
The proportion of the mica in the refractory insulating layer (8) is 25 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the resin, and the average particle size of the mica is 1000 μm or less. Fireproof cable (1).
(2)
In the refractory cable of (1) above
A refractory cable (1), characterized in that an insulator portion (9) is provided on the outer peripheral surface of the refractory insulating layer (8).
(3)
In the refractory cable of (1) or (2) above,
The refractory cable (1), wherein the refractory insulating layer (8) contains a drip inhibitor in a proportion of 0.3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin.
(4)
In the refractory cable according to any one of (1) to (3) above,
The refractory cable (1), wherein the refractory insulating layer (8) contains a flame retardant in a proportion of 5 parts by mass or more and 25 parts by mass or less with respect to 100 parts by mass of the resin.
(5)
In the fireproof cable according to any one of (1) to (4) above,
The refractory cable (1), characterized in that the thickness of the refractory insulating layer (8) is 0.10 mm or more and 3.00 mm or less.
(6)
In the refractory cable according to any one of (1) to (5) above,
A refractory cable (1), characterized in that the refractory insulating layer (8) is crosslinked.

1 Fireproof cable 2 Insulated core 3 Intervening 4 Pressing tape 5 Sheath 6 Conductor 8 Fireproof insulating layer 9 Insulator part 92 Inner layer insulator part 94 Outer layer insulator part

Claims (6)

A refractory cable with one or more insulated cores,
The insulating wire core comprises a conductor and a refractory insulating layer provided on the outer peripheral surface of the conductor.
The fireproof insulating layer is one or more selected from ethylene-vinyl acetate copolymer resin (EVA), ethylene-ethyl acrylate resin (EEA), ethylene-methyl acrylate resin (EMA) and ethylene-methyl methacrylate resin (EMMA). Including resin and mica,
The proportion of the mica in the fireproof insulating layer is 25 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the resin, and the average particle size of the mica is 1000 μm or less. cable. The fireproof cable according to claim 1, wherein an insulator portion is provided on the outer peripheral surface of the fireproof insulating layer. The refractory cable according to claim 1 or 2, wherein the refractory insulating layer contains a drip inhibitor in a proportion of 0.3 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin. The fireproof cable according to any one of claims 1 to 3, wherein the refractory insulating layer contains a flame retardant in a ratio of 5 parts by mass or more and 25 parts by mass or less with respect to 100 parts by mass of the resin. .. The fireproof cable according to any one of claims 1 to 4, wherein the thickness of the fireproof insulating layer is 0.10 mm or more and 3.00 mm or less. The fireproof cable according to any one of claims 1 to 5, wherein the fireproof insulating layer is crosslinked.

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