JP2013245334A - Flame retardant crosslinked resin composition and electric wire and cable using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame retardant crosslinked resin composition showing high varnish resistance conforming a varnish resistance test stipulated in CSA and high flame retardancy conforming a vertical flame test FT-1 of the CSA standard and having excellent mechanical characteristics such as tensile strength and tensile elongation, and to provide an electric wire/cable using the flame retardant crosslinked resin composition and having excellent characteristics satisfying the CSA standard and the UL standard.SOLUTION: A flame retardant crosslinked resin composition includes: 100 pts.mass of a resin principally consisting of an ethylene-vinyl acetate copolymer (EVA) and containing ≥20 mass% of vinyl acetate; 20-180 pts.mass of a flame retardant; and 0.1-20 pts.mass of N-(2H-1,2,4-triazole-5-yl)salicylamide based on 100 pts.mass of the resin. The flame retardant crosslinked resin composition is composed by crosslinking these components.

Description

  The present invention relates to a flame retardant crosslinked resin composition and an electric wire / cable using the flame retardant crosslinked resin composition, and more specifically, can pass a Canadian Standard (CSA) vertical combustion test (FT-1 test) and a varnish resistance test. The present invention relates to a flame retardant cross-linked resin composition and an electric wire / cable using the same.

  In various electric wires and cables such as an insulated wire and an insulated cable, a conductor or a jacket is insulated with a coating material. As a covering material for various electric wires and cables used for in-machine wiring of electrical equipment, a cross-linked polyolefin flame retardant cross-linked resin composition containing a flame retardant is widely used in order to increase the heat resistance and flame resistance of the covering material.

  In order to impart a high degree of flame retardancy, it is known that a large amount of a flame retardant needs to be added, and as a result, it is known that the tensile elongation characteristic is significantly reduced.

  On the other hand, among the insulated wires and cables used in Canada, the various types of wire cables that are used by connecting to a public power source must be compatible with the CSA (Canadian Standards Association) standard as stipulated by Canadian laws. Don't be.

  Such CSA standards are detailed in terms of various properties that a product must satisfy, and among them, it is necessary to pass a vertical combustion test called FT-1 relating to flame retardancy, and resistance to varnish resistance. It is necessary to pass the varnish property test, and satisfying these two characteristics is the strictest requirement item among the CSA standards.

  As an insulating material for conventional varnish-resistant insulated electric wires or cables, a sulfur-based antioxidant and a hindered phenol-based antioxidant are added as an antioxidant to a resin composition containing a hydrocarbon process oil. An insulating material using both of these has been proposed (see Patent Document 1).

  As another means, an insulating material in which a phenolic antioxidant is blended with a resin composition mainly composed of an ethylene propylene elastomer having a Mooney viscosity of 70 or less has been proposed (see Patent Document 2).

  All the insulating materials are CSA standard C22.2 No. 116 (patent document 1: paragraph [0025], patent document 2: upper right column of page 4, patent document 3: column 8, lines 55 to 60). ).

JP 05-112679 A Japanese Patent Laid-Open No. 02-006546 U.S. Pat. No. 4,381,362

  Thus, in order to pass a varnish resistance test for electric wires and cables, it is generally preferable to use a sulfur-based antioxidant and a phenol-based antioxidant in combination as an antioxidant. On the other hand, the CSA standard has been reviewed and revised as needed, and according to the study by the present inventors, even the resin composition using these antioxidants is the current CSA. It has not yet passed the varnish resistance test specified in C22.2 No127-09.

  Further, when a soft material is used as a component of the base polymer, such as a resin composition mainly composed of an ethylene propylene elastomer having a Mooney viscosity of 70 or less, the varnish resistance tends to be improved. It is still insufficient to pass the varnish test. On the other hand, according to such a resin composition, mechanical properties such as tensile strength and tensile elongation and flame retardancy are significantly reduced.

  Therefore, the present invention shows high varnish resistance that passes the varnish resistance test specified in CSA C22.2 No127-09, and has high flame resistance that passes the CSA standard vertical combustion test FT-1. An object of the present invention is to provide a flame retardant crosslinked resin composition having excellent mechanical properties such as tensile strength and tensile elongation characteristics, and an electric wire / cable having excellent characteristics using the same. To do.

  In order to achieve the above object, the present invention provides the following flame retardant crosslinked resin composition and electric wire / cable.

[1] 100 parts by mass of a resin having an ethylene vinyl acetate copolymer (EVA) as a main component and a vinyl acetate content of 20% by mass or more, and 20 to 180% of a flame retardant with respect to 100 parts by mass of the resin. A flame retardant crosslinked resin composition comprising 0.1 to 20 parts by mass of N- (2H-1,2,4-triazol-5-yl) salicylamide, and these are crosslinked. .

[2] An electric wire comprising a conductor and an insulator coated and formed on the outer periphery of the conductor using the flame retardant crosslinked resin composition according to [1].

[3] An electric wire comprising a conductor and an insulator coated and formed on the outer periphery of the conductor, and an outer periphery of the electric wire coated and formed using the flame-retardant crosslinked resin composition according to [1]. A cable with a sheath.

  The present invention relates to a resin having an ethylene vinyl acetate copolymer (EVA) as a main component and containing 20% by mass or more of vinyl acetate (VA) with N- (2H-1,2,4-triazole- By blending a predetermined amount of 5-yl) salicylamide, it is possible to provide a flame-retardant crosslinked resin composition that is flexible and excellent in varnish resistance tests and other characteristics, and electric wires and cables using the same. Become.

  In the prior art, the combined use of a sulfur-based antioxidant and a hindered phenol-based antioxidant has been disclosed as effective, but in the study by the present inventors, these effects are not necessarily sufficient, Further, it has been found that N- (2H-1,2,4-triazol-5-yl) salicylamide is the most effective among amine-based antioxidants.

  The details of the mechanism by which the above-mentioned N- (2H-1,2,4-triazol-5-yl) salicylamide is effective are unknown, but are considered as follows. That is, in the varnish resistance test, the varnish is cured after the varnish is applied to the electric wire. At this time, by adding an antioxidant having a radical scavenging effect to the resin composition, excessive curing of the varnish in the vicinity of the interface between the electric wire and the varnish is suppressed, and the varnish resistance test is easily passed. Both conventional hindered phenolic antioxidants and N- (2H-1,2,4-triazol-5-yl) salicylamide of the present invention are antioxidants having radical scavenging effects, but amine-based oxidation N- (2H-1,2,4-triazol-5-yl) salicyl is generally used because the inhibitor is generally less compatible with resins such as EVA and tends to bloom near the interface between the electric wire and the varnish. It is considered that the amide had an effect of improving the varnish resistance test.

  As described above, the present invention shows high varnish resistance that passes the varnish resistance test specified in CSA C22.2 No127-09, and high flame resistance that passes the CSA standard vertical combustion test FT-1. A flame-retardant cross-linked resin composition that exhibits excellent properties and excellent mechanical properties such as tensile strength and tensile elongation, and an electric wire / cable having excellent properties using the same. it can.

It is sectional drawing which shows typically the electric wire which concerns on the copper conductor and the outer periphery of a copper conductor with the insulator coat | covered and formed using the flame-retardant crosslinked resin composition which concerns on embodiment of this invention. . Three conductors with a copper conductor and an insulator coated and formed on the outer periphery of the copper conductor, the interposition of paper twisted together with the electric wire, a presser wound tape wound around the outer periphery, and the outermost layer, It is sectional drawing which shows typically the cable which concerns on the embodiment of this invention provided with the sheath formed by extrusion-coating the above-mentioned flame-retardant crosslinked resin composition.

[Summary of embodiment]
The flame retardant crosslinked resin composition of the present embodiment is a flame retardant resin composition containing a resin and a flame retardant, and has a vinyl acetate content mainly composed of an ethylene vinyl acetate copolymer (EVA). 100 parts by mass of resin that is 20% by mass or more, 20 to 180 parts by mass of flame retardant, and 0 of N- (2H-1,2,4-triazol-5-yl) salicylamide with respect to 100 parts by mass of resin 0.1 to 20 parts by mass, and these are cross-linked.

[Embodiment]
Hereinafter, embodiments of the flame-retardant crosslinked resin composition of the present invention and electric wires and cables using the same will be described.

1. Flame Retardant Crosslinked Resin Composition The flame retardant crosslinked resin composition according to the present embodiment is a resin having an ethylene vinyl acetate copolymer (EVA) as a main component and a vinyl acetate content of 20% by mass or more. 100 parts by mass, 100 parts by mass of resin, 20 to 180 parts by mass of flame retardant, and 0.1 to 20 parts by mass of N- (2H-1,2,4-triazol-5-yl) salicylamide, It contains, and these are comprised so that it may bridge | crosslink. Hereinafter, each component will be described.

(1) Resin The flame retardant crosslinked resin composition according to the present embodiment contains a resin mainly composed of an ethylene vinyl acetate copolymer (EVA). This resin has a vinyl acetate (VA) content of 20% by mass or more. If the VA content is less than 20% by mass, sufficient varnish resistance may not be obtained. The upper limit of the VA content is not particularly limited as long as it is 20% by mass or more, but when used for electric wires and cables that require cold resistance, the VA content is preferably less than 60% by mass. In addition, other polyolefins can be blended with EVA so that the VA content in the resin is 20% by mass or more.

  Other polyolefins include, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), linear very low density polyethylene (VLDPE), high density polyethylene (HDPE), ethylene-ethyl acrylate copolymer Copolymer (EEA), ethylene-glycidyl methacrylate copolymer, ethylene-butene-1 copolymer, ethylene-butene-hexene terpolymer, ethylene-propylene-diene terpolymer (EPDM), ethylene-octene Copolymer (EOR), ethylene copolymer polypropylene, ethylene-propylene copolymer (EPR), poly-4-methyl-pentene-1, maleic acid grafted low density polyethylene, hydrogenated styrene-butadiene copolymer (H -SBR), maleic acid grafted linear low density polyethylene Copolymer of ethylene and α-olefin having 4 to 20 carbon atoms, ethylene-styrene copolymer, maleic acid grafted ethylene-methyl acrylate copolymer, maleic acid grafted ethylene-vinyl acetate copolymer, ethylene -Maleic anhydride copolymer, ethylene-ethyl acrylate-maleic anhydride terpolymer, ethylene-propylene-butene-1 terpolymer mainly containing butene-1 And chlorinated polyethylene, chlorosulfonated polyethylene, chlorinated polypropylene, and the like, which are halogen-containing resins. These can be used individually by 1 type or in mixture of 2 or more types.

(2) N- (2H-1,2,4-triazol-5-yl) salicylamide The flame retardant crosslinked resin composition according to the present embodiment includes N- (2H-1) as an amine-based antioxidant. , 2,4-triazol-5-yl) salicylamide is contained in an amount of 0.1 to 20 parts by mass with respect to 100 parts by mass of the resin. As long as the effects of the present invention are exhibited, as other amine-based antioxidants, 6-ethoxy-1,2-dihydro-2,2,4-trimethylquinoline, phenyl-1-naphthylene, alkylated diphenylamine, octylated diphenylamine 4,4′-bis (α, α-dimethylbenzyl) diphenylamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, ρ- (ρ-toluenesulfonylamido) diphenylamine, N, N′- Di-2-naphthyl-ρ-phenyldiamine, N, N′-diphenyl-ρ-phenylenediamine, N-phenyl-N′-isopropyl-ρ-phenylenediamine, N-phenyl-N ′-(1,3-dimethylbutyl)- ρ-phenylenediamine, N-phenyl-N ′-(3-methacryloyloxy-2-hydroxypropyl) -ρ-fe Range amine, 1,3-benzenedicarboxylic acid bis [2- (1-oxo-2-phenoxypropyl) hydrazide, 2 ′, 3-bis [[3- [3,5-di-tert-butyl-4-hydroxy Phenyl] propionyl 1] propionohydrazide, dodecanedioic acid bis [N2- (2-hydroxybenzoyl) hydrado] and the like are blended with N- (2H-1,2,4-triazol-5-yl) salicylamide. Can be used.

  The content of N- (2H-1,2,4-triazol-5-yl) salicylamide is 0.1 to 20 parts by mass with respect to 100 parts by mass of the resin. If the amount is less than 0.1 parts by mass, a sufficient effect of improving varnish resistance may not be obtained. If the amount exceeds 20 parts by mass, other physical properties such as the degree of crosslinking may be affected.

(3) Flame retardant The flame retardant crosslinked resin composition according to the present embodiment contains 20 to 180 parts by mass of the flame retardant with respect to 100 parts by mass of the resin. In general, flame retardants can be broadly classified into halogen-based flame retardants and non-halogen-based flame retardants. In the present embodiment, both halogen-based flame retardants and non-halogen-based flame retardants can be used. A flame retardant and a halogen-free flame retardant can be used in combination. The addition amount when adding the halogen-based flame retardant alone is preferably 20 parts by mass or more and 180 parts by mass or less with respect to 100 parts by mass of the resin. The addition amount when adding the non-halogen flame retardant alone is the resin 80 mass parts or more and 180 mass parts or less are preferable with respect to 100 mass parts.

  Examples of halogen flame retardants include ethylene bispentabromobenzene, tetrabromobisphenol A-bis (2,3-dibromopropyl ether), decabromodiphenyl oxide, octabromodiphenyl oxide, pentabromodiphenyl oxide, and tetrabromobisphenol A. Tetrabromobisphenol A-bis (allyl ether), tetrabromobisphenol A-bis (2-hydroxyether), hexabromocyclodecane, bis (tribromophenoxy) ethane, tetrabromobisphenol A epoxy oligomer, tetrabromobisphenol A carbonate Oligomer, ethylenebistetrabromophthalimide, poly-dibromophenylene oxide, 2,4,6-tribromophenol, tetrabromide Bisphenol A-bis (acrylate), tetrabromophthalic anhydride, tetrabromophthalate diol, 2,3-dibromopropanol, tribromostyrene, tetrabromophenylmaleimide, poly (pentabromobenzyl) acrylate, tris (tribromoneopentyl) ) Phosphate, tris (dibromophenyl) phosphate, tris (tribromophenyl) phosphate, 1,2,3,4,7,8,9,10,13,13,14,14 phosphate, tris (tribromophenyl) phosphate 1, 2, 3, 4, 7, 8, 9, 10, 13, 13, 14, 14-dodecachloro-1, 4, 4a, 5, 6, 6a, 7, 10, 10a, 11, 12, 12a -Dodecahydro-1,4,7,10-dimethanodibenzo (a, ) Cyclooctene, chlorinated paraffin, perchlorocyclopentadecane, tetrachlorophthalic anhydride, may be mentioned chlorendic acid, dodecamethylene chloro cyclooctane as preferable examples. Of these, ethylene bispentabromodiphenyl is more preferable. These can be used individually by 1 type or in mixture of 2 or more types. These halogen-based flame retardants can also be used in combination with antimony compounds such as antimony trioxide, antimony tetroxide, antimony pentoxide, potassium antimonate, and sodium antimonate.

  Non-halogen flame retardants include, for example, metal hydroxides such as magnesium hydroxide, aluminum hydroxide, and calcium hydroxide; 1,3,5-triazines such as melamine, cyanuric acid, isocyanuric acid, melamine cyanurate, and melamine sulfate. Derivatives: Zinc compounds such as zinc stannate, zinc hydroxystannate, zinc borate, zinc oxide and the like can be mentioned as suitable examples. These can be used individually by 1 type or in mixture of 2 or more types. These flame retardants may be silane coupling agents; titanate coupling agents; those surface-treated with fatty acids such as stearic acid and calcium stearate or fatty acid metal salts.

  Content of a flame retardant is 20-180 mass parts with respect to 100 mass parts of resin. If the amount is less than 20 parts by mass, sufficient flame retardancy may not be obtained, and if it exceeds 180 parts by mass, the elongation characteristics may be significantly deteriorated.

(4) Other components In addition to the above components, if necessary, metal deactivators, antioxidants other than amines, other flame retardants, flame retardant aids, crosslinking agents, crosslinking aids, It is possible to add additives such as a lubricant, an inorganic filler, a compatibilizer, a stabilizer, carbon black, and a colorant. Furthermore, it may be crosslinked by an organic peroxide or by radiation such as an electron beam. In addition, a general purpose thing can be used for these additives.

  A metal deactivator has the effect which stabilizes a metal ion by chelate formation and suppresses antioxidant. Preferred examples of the metal deactivator include 2 ', 3-bis [[3- [3,5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propionohydrazide.

  Examples of the antioxidant other than the amine-based antioxidant include a phenol-based antioxidant and a sulfur-based antioxidant. Examples of the phenolic antioxidant include dibutylhydroxytoluene (BHT), pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 1,3,5-tris ( 3,5-di-tert-butyl-4-hydroxy-benzyl) -S-triazine-2,4,6- (1H, 3H, 5H) trione, thiodiethylenebis [3- (3,5-di-tert -Butyl-4-hydroxyphenyl) propionate] and the like.

  As a sulfur-type antioxidant, for example, tetrakis [methylene-3- (dodecylthio) propionate] methane can be cited as a preferred example.

  Other flame retardants include, for example, boric acid compounds such as zinc borate, calcium borate, barium borate, and barium metaborate, phosphorus flame retardants, and mixtures of components that foam and solidify during combustion. Inteumescent flame retardants and the like that can be mentioned as preferred examples.

  Preferred examples of the crosslinking aid include trimethylolpropane trimethacrylate (TMPT) and triallyl isocyanurate (TAIC).

  Other components can be used alone or in combination of two or more.

2. Electric Wire / Cable As shown in FIG. 1, an electric wire 10 according to the present embodiment includes a copper conductor 1 and an insulator 2 that is coated and formed on the outer periphery of the copper conductor 1 using the above-described flame-retardant crosslinked resin composition. And is configured. As shown in FIG. 2, the cable 20 of the present embodiment includes an electric wire 10 and a sheath 3 that is coated and formed on the outer periphery of the electric wire 10 using the above-described flame-retardant crosslinked resin composition. Composed. Furthermore, specifically, the cable 20 of the present embodiment is coated with the above-described flame-retardant crosslinked resin composition or generally used insulating resin on the outer periphery of the copper conductor 1 and the copper conductor 1. Three electric wires 10 provided with the formed insulator 2, interposition 4 such as paper twisted together with the electric wires 10, presser wound tape 5 wound around the outer periphery, and the above-mentioned flame retardant as the outermost layer And a sheath 3 formed by extrusion coating of the conductive crosslinkable resin composition. The electric wire 10 and the cable 20 of this Embodiment are equipped with the insulator 2 or the sheath 3 coat | covered and formed using the above-mentioned flame-retardant crosslinked resin composition, High varnish resistance and flame retardance And excellent mechanical properties such as tensile elongation properties.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

Example 1
Ethylene vinyl acetate copolymer (VA content: 41% by mass, MFR: 0.3) 100 parts by mass, magnesium hydroxide (manufactured by Kamishima Chemical Co., Ltd., trade name: Magseeds S4)) 100 parts by mass, amine-based 5 parts by mass of antioxidant A (N- (2H-1,2,4-triazol-5-yl) salicylamide, manufactured by Ouchi Shinsei Chemical Co., Ltd., trade name: NOCRACK CD), and metal deactivator (BASF Japan Co., Ltd., trade name: Irganox MD1024) 1 part by mass is kneaded with a pressure kneader at a starting temperature of 40 ° C. and an end temperature of 190 ° C. A product was made.

  As shown in FIG. 1, the electric wire was produced by extruding the kneaded product (flame retardant crosslinked resin composition) in the pressure kneader onto a copper conductor at a thickness of 0.81 mm and a set temperature of 200 ° C. An insulator was formed with an irradiation amount of 60 kGy and a gel fraction of 86% to 90%.

  Table 1 shows the evaluation results of the electric wires formed using the flame-retardant crosslinked resin composition produced in Example 1. In addition, evaluation of the electric wire was determined by the following test method.

(Test method for electric wire evaluation)
(1) Tensile test The produced electric wire was subjected to a tensile test in accordance with JISC3005. As for the elongation, less than 150% was evaluated as x (failed), 150-300% was evaluated as ◯ (accepted), and more than that was evaluated as ◎ (accepted with tolerance). Tensile strengths of less than 10 MPa were evaluated as x (failed), 10-13 MPa were evaluated as ◯ (accepted), and more than ◎ (accepted with tolerance).

(2) Flame Retardancy Test A vertical combustion test (FT-1) in the shape of an electric wire was performed. Judgment was made with ◎ (pass with tolerance) for combustion time less than 30 seconds, ○ (pass) for more than 30 seconds and less than 1 minute, and X (fail) for more than 1 minute.

(3) Varnish resistance test CSA C22.2 No. The test was carried out in accordance with the test method specified in 127-09 6, 2, 8 (Insulating Varnish). The produced electric wire is immersed in an insulating varnish (ISONEL 31) at room temperature for 1 hour, then taken out from the insulating varnish and suspended for 1 hour. Thereafter, the varnish is cured in an oven set at 160 ° C. for 20 hours, taken out, allowed to stand at room temperature for 2 hours, and wrapped around a self-diameter mandrel 6 times. A voltage of 2000 V was applied to the wound electric wire for 1 minute, and the one that did not break was evaluated as ◯ (passed), and the one that was broken was evaluated as x (failed).

(4) Gel fraction The gel fraction was measured based on JISC3005. This gel fraction is generally used for electric wires using a crosslinked resin composition as an index representing the crosslinked state of the resin composition.

(Examples 2 to 14)
A flame retardant crosslinked resin composition was produced in the same manner as in Example 1 except that the formulation was changed to that shown in Table 1, and an electric wire was formed. The evaluation results of the obtained electric wire are shown in Table 1.

(Comparative Examples 1-7)
A flame retardant crosslinked resin composition was prepared and an electric wire was formed in the same manner as in Example 1 except that the formulation was changed to that shown in Table 2. Table 2 shows the evaluation results of the obtained electric wires.

(About evaluation results)
In Examples 1 to 3, the VA content in the resin was changed. However, since the content was 20% by mass or more, the varnish resistance test was passed and other characteristics were good. Moreover, flame retardance improves, so that there is much VA content. Other polyolefins were blended in Example 4, but the VA content was within the specified range, so that good characteristics were obtained.

  In Examples 5 to 7, the blending (content) amount of ethylene bispentabromobenzene and antimony trioxide, which are halogen flame retardants, was changed, but was within the specified range, so varnish and other characteristics were good Met. Compared with Example 6 in which the blending amount of ethylenebispentabromobenzene was 20 parts by mass, Example 7 in which the blending amount was 150 parts by mass had improved flame retardancy, and the blending was favorable. I understand.

  In Examples 8 to 11, although the blending amount of magnesium hydroxide, which is a non-halogen flame retardant, was changed, it was within the specified range, so the varnish and other characteristics were good. Compared with Example 8 in which the blending amount of magnesium hydroxide was 80 parts by mass, Example 11 in which the blending amount was 180 parts by mass had improved flame retardancy, and the blending was favorable. I understand. Further, in Example 10, melamine cyanurate was used in combination with magnesium hydroxide, but flame retardancy was improved as compared with Example 9 in which magnesium hydroxide alone was blended, and blending of melamine cyanurate was favorable. I understand that it was good.

  The amount of the amine-based antioxidant was changed in Examples 12 and 13, but N- (2H-1,2,4-triazol-5-yl) salicylamide showed good characteristics. Although other antioxidants were used in combination with Example 14, N- (2H-1,2,4-triazol-5-yl) salicylamide was within the prescribed range, so the varnish and other characteristics were It was good.

  On the other hand, as shown in Table 2, the varnish resistance test failed in Comparative Examples 1 and 2 in which the VA content in the resin was less than specified. In Comparative Example 3 in which the blending amount of the flame retardant was less than the specified value, the flame retardancy was rejected. In Comparative Examples 4 and 5 in which the blending amount of the flame retardant was larger than specified, the elongation characteristics and the varnish resistance test failed. In Comparative Example 6 in which the compounding amount of the amine-based antioxidant (N- (2H-1,2,4-triazol-5-yl) salicylamide) was less than specified, the varnish resistance test failed.

  Moreover, the comparative example 7 which used together the phenolic antioxidant represented by the patent document 1, and the sulfur type antioxidant failed the varnish resistance test.

1 Copper conductor 2 Insulator 3 Sheath 4 Interposition 5 Presser winding tape 10 Electric wire 20 Cable

Claims (3)

100 parts by mass of a resin containing ethylene vinyl acetate copolymer (EVA) as a main component and containing 20% by mass or more of vinyl acetate, and 20 to 180 parts by mass of a flame retardant with respect to 100 parts by mass of the resin, And N- (2H-1,2,4-triazol-5-yl) salicylamide in an amount of 0.1 to 20 parts by mass, and
A flame retardant crosslinked resin composition obtained by crosslinking these.   An electric wire comprising: a conductor; and an insulator coated and formed on the outer periphery of the conductor using the flame retardant crosslinked resin composition according to claim 1.   An electric wire comprising a conductor and an insulator coated and formed on the outer periphery of the conductor; and a sheath coated and formed on the outer periphery of the electric wire using the flame retardant crosslinked resin composition according to claim 1; With cable.

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