JP2002289043A - Electric wire and cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire and a cable having excellent properties for extrusion molding, superb heat deformation rates and superb elongation characteristics, where an insulator has decreased number of voids, foreign substances and uneven portions and as the result water trees are reduced to enhance dielectric breakdown. SOLUTION: The electric wire and the cable are prepared by coating the conductive material 1 with the insulating member 3 which is a resin composition consisting of a polymer component whose base is a straight chain polyethylene, a copolymer of ethylene and hexane-1 copolymer, having a melting point of >=120 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric wires and cables, and more particularly to a resin composition comprising a polymer component mainly composed of linear polyethylene having a melting point of 120 DEG C. or higher, which is a copolymer of ethylene and hexene-1. TECHNICAL FIELD The present invention relates to an electric wire or cable in which an object is covered on a conductor or a conductor shielding layer as an electric insulator.

[0002]

2. Description of the Related Art In general, so-called cross-linked polyethylene obtained by cross-linking polyolefin, particularly polyethylene, is widely used as a material of an electric insulator for electric wires and cables. The wires / cables and accessories coated with the crosslinked polyethylene have excellent electric insulation and heat resistance.

However, when the insulator made of cross-linked polyethylene is used in a humid or immersed atmosphere, water trees (eg, bow tie trees, internal trees, and external trees) are generated inside the insulator, and the material has excellent electrical properties. It has the disadvantage that the insulation performance is greatly reduced.

[0004] Such a water tree is defective in a local high electric field portion such as voids and foreign substances in the insulator, and amber (one having a high degree of polymerization or being crosslinked to have a high molecular weight). It is known that water is generated by agglomeration of water.

[0005] Even if there is almost no moisture, the starting point of the dielectric breakdown is determined by a precursor cutoff test in which the voltage is cut off immediately after the partial discharge starts as a sign of the dielectric breakdown. It has been found that most cases are amba.

Therefore, in order to eliminate these defects in the electric wires and cables, the quality control of the resin and the improvement of the manufacturing technology of the electric wires and cables have made it possible to suppress the water tree and improve the dielectric strength. Have been

[0007]

However, according to the conventional wires and cables coated with cross-linked polyethylene, sufficient properties cannot be obtained in terms of extrudability, heat deformation rate, and tensile properties. There is a limit to the reduction of voids and ambas.

Accordingly, an object of the present invention is to improve extrudability, heat deformation rate, and tensile properties, thereby reducing voids, foreign matter, invar, etc., and as a result, reducing water voids and improving dielectric breakdown strength. It is an object of the present invention to provide an electric wire / cable with improved characteristics.

[0009]

In order to achieve the above-mentioned object, the present invention provides a copolymer of ethylene and hexene-1,
It is characterized in that a conductor or a conductor shielding layer is coated with a resin composition comprising a polymer component mainly composed of linear polyethylene having a melting point of 120 ° C. or more to provide an electric wire / cable formed as an insulator.

[0010] The polymer component is a copolymer of ethylene and hexene-1, which is a linear polyethylene having a melting point of 120 ° C or higher, a high-pressure radically polymerized polyethylene, an ethylene-vinyl acetate copolymer, and an ethylene ethyl acrylate copolymer. , One or two selected from ethylene copolymers such as ethylene ethyl methacrylate copolymer, ethylene methyl methacrylate copolymer, ethylene propylene rubber, ethylene butene-1 copolymer, and ethylene octene rubber.
It is characterized by being obtained by blending seeds or more.

[0011] Further, the resin composition may contain, as an antioxidant, 2,2-thio-diethylenebis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] as an antioxidant. Pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3
5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4-bis- (n-octylthio) -6
(4-hydroxy-3,5-di-t-butylanilino)
-1,3,5-triazine, bis [2-methyl-4-
[3-n-alkyl (C ₁₂ or C ₁₄ ) thiopropionyloxy] -5-t-butylphenyl] sulfide, 4,
One or more selected from 4'-thiobis (3-methyl-6-t-butylphenol) obtained by blending 0.05 to 1.0 part by weight with respect to 100 parts by weight of the polymer component. There is a feature.

[0012] The resin composition contains 2,2-thio-diethylenebis [3-] as an antioxidant in the polymer component.
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate], pentaerythrityl-tetrakis [3
-(3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4-bis- (n- Octylthio) -6- (4-
Hydroxy-3,5-di-t-butylanilino) -1,
One or two kinds selected from 3,5-triazines are added in an amount of 0.05 to 0.5 part by weight based on 100 parts by weight of the polymer component and dilauryl thiodipropionate, dimyristyl thiodipropionate, distearyl thiodipro. One or two kinds selected from pionate and tetrakis (methylenedodecylthiopropionate) methane are obtained by adding 0.05 to 0.5 part by weight to 100 parts by weight of the polymer component. It is characterized by.

[0013] The insulator is cross-linked so that the gel fraction of the polymer component is 40% or more.

As a crosslinking agent, dicumyl peroxide;
2,5-dimethyl-2,5-di (t-butylperoxy) phenxane, 2,5-dimethyl-2,5-di (t-
Butylperoxy) fexin-3, α, α'-bis (t
-Butylperoxy-m-isopropyl) benzene, butylcumyl peroxide, isopropylcumyl-t-
It is characterized by providing an electric wire or cable in which an insulator is formed with a resin composition to which one or more kinds selected from butyl peroxide are added.

A graft polymer, which is a copolymer of ethylene and hexene-1 and has a melting point of not less than 120 ° C. and is mainly composed of linear polyethylene, and which is obtained by subjecting an alkoxyxysilane to a graft reaction in the presence of a radical generator. It is characterized in that it is formed as an insulator on a conductor or a conductor shielding layer, and the insulator is crosslinked by contact with moisture. Examples of the radical generator include dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) phenxane, 2,5-dimethyl-2,5-di (t
(Butyl-oxy) phenxin-3, α, α′-bis (t-butylperoxy-m-isopropyl) benzene, butylcumyl peroxide, isopropylcumyl-t-butylperoxide, or one or more selected from the group consisting of: It is characterized by using more than one kind in combination.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a conductor 1 of an electric wire or cable.
Is an insulator 3 formed from the composition of the present invention. FIG. 2 shows a conductor 1 of an electric wire / cable, an inner semiconductive layer 2, an insulator 3 formed by the composition of the present invention,
And an external semiconductive layer 4. Fig. 3
It has a conductor 1 of a cable, an inner semiconductive layer 2 and an insulator 3 formed of the composition of the present invention. This is because the semiconductive layer provided inside and outside the insulator or inside the insulator serves to alleviate the electric field to the insulator 3. FIG.
An insulator 3 formed by covering a conductor 1 of an electric wire or cable with a watertight compound 5 and forming the outside thereof with a composition of the present invention.
It is what it was. By coating the conductor 1 with a watertight compound, water is prevented from running in the axial direction of the conductor.

Regarding insulators of electric wires and cables, a resin composition comprising a polymer component mainly composed of a linear polyethylene having a melting point of 120 ° C. or more, which is a copolymer of ethylene and hexene-1, has a dielectric breakdown strength. And improved water tree resistance.

In addition, a linear polyethylene having a melting point of 120 ° C. or more, a copolymer of ethylene and hexene-1, and a high-pressure radically-polymerized polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-ethyl methacrylate When one or two or more selected from ethylene copolymers such as late copolymer, ethylene methyl methacrylate copolymer, ethylene propylene rubber, ethylene butene-1 copolymer and ethylene octene rubber are blended. An electrical insulating composition that is advantageous for extrudability is obtained.

As the above-mentioned linear polyethylene having a melting point of 120 ° C. or more, which is a copolymer of ethylene and hexene-1,
It includes a two-stage polymerization using a Ziegler-based multi-site catalyst, a single-site catalyst called a metallocene catalyst, or a polymer having a wide molecular weight distribution polymerized using a chromium-based catalyst. In addition, if the material is other than the copolymer of ethylene and hexene-1, the mechanical strength is reduced.

The reason why the melting point is set to 120 ° C. or more is as described in
120 ° C in the test method specified in C3005
This is because it is possible to reduce the heating deformation rate in the above.

As antioxidants, 2,2-thio-diethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], pentaerythrityl-tetrakis [3- (3,5 -Di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3-
(3,5-di-t-butyl-4-hydroxy xyphenyl)
Propionate, 2,4-bis- (n-octylthio)
-6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, bis [2-methyl-
4- [3-n- alkyl (C ₁₂ or C ₁₄₎ thio propionyloxy] -5-t-butylphenyl] sulfide,
One or more selected from 4,4'-thiobis (3-methyl-6-t-butylphenol) is added in an amount of 0.05 to 0.5 part by weight based on 100 parts by weight of the polymer component. , Heat aging characteristics can be improved. Also,
2,2-thio-diethylenebis [3- (3,5-di-t
-Butyl-4-hydroxyphenyl) propionate], pentaerythrityl-tetrakis [3- (3,5-
Di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate, 2,4-bis- (n-octylthio) -6- (4-hydroxy-
One or two selected from (3,5-di-t-butylanilino) -1,3,5-triazine are used in an amount of 0.05 to 0.5 part by weight based on 100 parts by weight of the polymer component and dilaurylthiodipropion. One or two types selected from neto, dimyristylthiodipropionate, distearylthiodipropionate, and tetrakis (methylenedodecylthiopropionate) methane are used in an amount of 0.05 to 0.5 with respect to 100 parts by weight of the polymer component. When added in parts by weight, heat aging characteristics can be further improved, and a remarkable synergistic effect can be expected.
Further, in this case, particularly, metal damage can be prevented.

These antioxidants can be supplied in the form of a master batch kneaded in high concentration in polyethylene in advance or in a dry blended form with polyethylene.
When performing silane water crosslinking, it is also possible to dissolve in vinylalkoxysilane and inject into polyethylene in an extruder. The addition amount of each of these antioxidants is preferably 0.05 to 0.5 part by weight based on 100 parts by weight of the polymer component, and if less than 0.05 part by weight, the effect of preventing oxidation and preventing metal damage is obtained. If the amount is less than 0.5 parts by weight, a so-called bloom phenomenon that precipitates on the surface of polyethylene occurs.

When the insulating material mainly composed of polyethylene is crosslinked so as to have a gel fraction of 40% or more, the rate of heat deformation at a high temperature can be suppressed to a very small value. Can be reduced.

The crosslinking agents used for crosslinking include dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 2,5-dimethyl-2,5-diethyl. (T-butylperoxy) hexyne-3,
α, α′-Bis (t-butylperoxy-m-isopropyl) benzene, butylcumyl peroxide, isopropylcumyl-t-butylperoxide and the like can be used alone or in combination of two or more.

When the polymer component is crosslinked by silane water crosslinking, vinylalkoxysilanes include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriacetoxysilane, vinyldimethoxymethylsilane, vinyldiethoxymethylsilane, and vinylmethoxydimethylsilane. And vinylethoxydimethylsilane. These may be used alone or in combination of two or more.

The radical initiator used for producing the silane-modified polyethylene according to the present invention includes dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 2,5-dimethyl −2,5-
Di (t-butylperoxy) hexine-3, α, α′-bis (t-butylperoxy-m-isopropyl) benzene, butylcumyl peroxide, isopropylcumyl-t-butyl peroxide and the like. These may be used alone or in combination of two or more.

Here, the amount of the radical initiator to be added is from 0.05 to 0. 0 to 100 parts by weight of the polymer component.
When the amount is less than 0.05 part by weight, the degree of crosslinking is insufficient. When the amount exceeds 0.15 part by weight, there is a problem that voids are generated in the insulator due to decomposition products of the radical initiator.

In the present invention, if necessary, a silanol condensation catalyst is added to the polyethylene or the polyethylene is allowed to permeate the polyethylene from the surface of the molded product in order to promote crosslinking. Such a silanol condensation catalyst is generally a carboxylate of a metal such as tin, zinc, iron, lead, and cobalt, an organic base, an inorganic acid, an organic acid, and the like. Specifically, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dioctate, stannous acetate, stannous cabrate, lead naphthenate, zinc cabrate, cobalt naphthenate, ethylamine, dibutylamine, hexylamine,
Examples include inorganic acids such as pyridine, sulfuric acid, and hydrochloric acid, and organic acids such as toluenesulfonic acid, acetic acid, stearic acid, and maleic acid. These are not specified, but polyethylene 1
It is used by adding 0.01 to 0.1 part by weight to 00 parts by weight.

An electric wire using the above silanol condensation catalyst
As a method for manufacturing a cable, the following two methods can be given. One is a method called two-shot or Sioplus, in which a masterbatch containing a high concentration of a silanol condensation catalyst is prepared and supplied to an extruder together with a silane-grafted polyethylene prepared in advance and molded. Second, a compounding agent containing a silanol condensation catalyst and a radical initiator is supplied to polyethylene in an extruder, and a graft reaction of vinylalkoxysilane onto polyethylene and molding of electric wires and cables are simultaneously performed in one extruder. This is a method called shot or monosil.

Further, in addition to the above-mentioned compounds, addition of carbon black and additives such as a lubricant and a coloring agent for imparting weather resistance can be used without any problem.

It is also possible to use a watertight conductor filled with a watertight compound 5 (see FIG. 4) as a conductor in order to prevent water running. Further, an insulator shielding layer made of a semiconductive resin composition can be provided on the crosslinked polyethylene insulator.

[0032]

【Example】

Table 1 Examples 1 to 9 and

The compositions having the formulations shown in Comparative Examples 1 to 4 of Table 2
A sheet was prepared by kneading with a hot roll at 20 ° C. and pelletized with a pelletizer. Next, the pellets were put into an extruder, and 2.5 mm each was placed on a 60 mm ²
(See FIG. 1).

Also,

[Table 3] ~

The insulating compositions shown in Examples 10 to 18 and Comparative Examples 5 to 8 of Table 6 were kneaded by a kneader, and an inner semiconductive layer having a thickness of 0.7 mm was formed on a 60 mm ² soft copper stranded wire 1 by an extruder. 2
And extruded together with the external semiconductive layer 4 to a thickness of 4.5 mm. The details at this time are as follows.

[0034]

Table 3 and

A composition having the composition shown in Table 4 was kneaded with a hot roll at 120 ° C. to form a sheet, which was then pelletized with a pelletizer. Then, the pellets were put into an extruder, and as shown in FIG. 2, 4.5 mm with a 0.7 mm thick inner semiconductive layer 2 and an outer semiconductive layer 4 on a 60 mm ² soft copper stranded wire 1.
It was extruded as a thick insulator 3. After this, crosslinking is immediately performed in a dry crosslinking tube using nitrogen gas as a medium.
The cable was completed by cooling and used as a sample.

Also,

Table 5 and

A dry blend of polyethylene or a combination of polyethylene or polyethylene and carbon masterbatch excluding vinyl trimethoxysilane and dicumyl peroxide was previously prepared at about 200 ° C.
It was charged into a 0 mm extruder. Vinyl tree methoxysilane and dicumyl peroxide were injected from the lower part of the hopper of the extruder. In this extruder, mixing, silane grafting and cable molding were performed simultaneously. After the cable was formed in this way, it was left in an atmosphere of 80 ° C. and 95% water vapor for 24 hours to be crosslinked to obtain a sample.

The extrudability of each of these samples was evaluated based on the appearance, and the heat deformation ratio was examined by the following method. The heating deformation rate conformed to JIS C3005. A cable sample with a heating deformation rate of 25% or less at 120 ° C was rated as good, and a cable sample with a deformation rate exceeding 25% was rated as bad.

The tensile strength was measured in accordance with JIS C3005.
Those less than that are indicated by x.

The evaluation test of bow titley characteristics was performed by immersing the above-mentioned sample injected into the conductor in hot water at 90 ° C. and applying an AC voltage of 9 kV at 50 Hz between the conductor and water for 500 days. After 500 days, the cable section was sliced thinly, stained by boiling with an aqueous methylene blue solution, and the length of the bow title tree and the number of bow title trees having a size of 200 μm or more were counted using an optical microscope.

With respect to the metal damage deterioration characteristics, the initial tensile strength and elongation were measured after heating at 135 ° C. for 7 days in accordance with the standard of IEC502, and the residual ratios were all within the range of 100 ± 25%. Those passed. Also, directly on the conductor,
As for the one coated with the insulator, in addition to the determination of the tensile properties, the discoloration of the portion in contact with the copper conductor was examined, and the one without discoloration was accepted.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[0040]

As shown in Table 1, Examples 1 to 9 have good extruded appearance, small heat deformation rate, and good properties of all bow titles.

Further, those in which an antioxidant is used in combination as in Examples 3 to 6 also have excellent copper damage deterioration characteristics.

On the other hand, Comparative Example 1 using a linear polyethylene of ethylene-butene-1 copolymer out of the specified range of the present invention has good heat deformation properties, but has poor extruded appearance, tensile strength, Bow bowing properties are also poor. Those having a low melting point, such as Comparative Examples 2 to 4, are inferior in heat deformation characteristics and bow titlery characteristics.

In the case where the antioxidant is added in excess of the specified amount as in Comparative Example 4, the bloom becomes large.

[0044]

[Table 3] ~

Table 6 shows examples in the case of crosslinking, respectively.
Nos. 0 to 27 have good extruded appearance, low heat deformation rate, high tensile strength, and good properties of all bow titles.

On the other hand, Comparative Examples 5 and 9 using the ethylene-butene-1 copolymer linear polyethylene out of the specified range of the present invention had good heat deformation properties, but had poor extrusion appearance and tensile strength. The bow titley properties are also inferior.
Those having a low melting point, such as Comparative Examples 6 to 8, and 10 to 12, are inferior in heat deformation characteristics and bow titley characteristics.
In addition, when the antioxidant is added in excess of the specified amount as in Comparative Examples 8 and 12, the bloom becomes large.

[0046]

As described above, according to the present invention, extrudability, heat deformation rate, and tensile properties are excellent, and voids, foreign substances, and invar can be reduced. As a result, it is possible to obtain electric wires and cables having increased dielectric breakdown strength, and their industrial value is extremely high.

[Brief description of the drawings]

FIG. 1 shows electric wires and cables in which the outside of a conductor is an insulator.

FIG. 2 shows an electric wire / cable including a conductor of the electric wire / cable, an inner semiconductive layer, an insulator, and an outer semiconductive layer.

FIG. 3 shows an electric wire / cable including a conductor, an inner semiconductive layer, and an insulator.

FIG. 4 shows an electric wire or cable in which a conductor 1 is covered with a watertight compound and an insulator is formed on the outside thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire / cable conductor 2 Inner semiconductive layer 3 Insulator 4 Outer semiconductive layer 5 Watertight compound

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 51/06 C08L 51/06 H01B 3/44 H01B 3/44 F 7/282 9/02 Z 9/02 7/28 E (72) Inventor Junichi Abe 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Cable Engineering Co., Ltd. (72) Katsushi Hanawa 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture No. 1 F term in Hitachi Cable, Ltd. Hidaka factory (reference) 4J002 BB03X BB05W BB05X BB06X BB07X BB15X EJ066 EK037 EU186 EV046 FD076 FD147 GQ01 5G305 AA02 AB02 AB06 BA15 CA01 CA54 CD05 CD09 DA12 DA23 5G309 RA05 5313

Claims (10)

[Claims] 1. A resin composition comprising a polymer component mainly composed of linear polyethylene having a melting point of 120 ° C. or more, which is a copolymer of ethylene and hexene-1, is used as an insulator on a conductor or a conductor shielding layer. An electric wire or cable characterized by being formed. 2. The polymer component is a copolymer of ethylene and hexene-1. A linear polyethylene having a melting point of 120 ° C. or higher is added to a high-pressure radical polymerized polyethylene, an ethylene-vinyl acetate copolymer, and an ethylene ethyl acrylate. One or two or more selected from ethylene copolymers such as polymers, ethylene ethyl methacrylate copolymer, ethylene methyl methacrylate copolymer, ethylene propylene rubber, ethylene butene-1 copolymer, and ethylene octene rubber are blended. The electric wire / cable according to claim 1, which is obtained by: 3. The resin composition is a copolymer of ethylene and hexene-1, and a polymer component mainly composed of linear polyethylene having a melting point of 120 ° C. or more is added with 2,2- as an antioxidant as an antioxidant. Thio-diethylenebis [3- (3,5-
Di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl-tetrakis [3- (3,5
-Di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4.
Bis- (n-octylthio) -6- (4-hydroxy-
3,5-di -t- butylanilino) -1,3,5 Toriajin, bis [2-methyl-4-[3-n-alkyl (C ₁₂ or C ₁₄₎ thio propionyloxy] -5-t
-Butylphenyl] sulfide, 4,4′-thiobis (3
-Methyl-6-t-butylphenol)
The electric wire / cable according to claim 1, which is obtained by blending 0.05 to 1.0 parts by weight of one or more kinds with respect to 100 parts by weight of the polymer component. 4. The resin composition is a copolymer of ethylene and hexene-1, and is a linear polyethylene having a melting point of 120 ° C. or higher, a high-pressure radically polymerized polyethylene, an ethylene-vinyl acetate copolymer, and ethylene ethyl acrylate. One or two selected from ethylene copolymers such as a copolymer, an ethylene ethyl methacrylate copolymer, an ethylene methyl methacrylate copolymer, an ethylene propylene rubber, an ethylene butene-1 copolymer, and an ethylene octene rubber.
As an antioxidant, 2,2-thio-diethylenebis [3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate], pentaerythrityl-tetrakis [3
-(3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4 · bis- (n- Octylthio) -6- (4-
Hydroxy-3,5-di-t-butylanilino) -1,
3,5-triazine, bis [2-methyl-4- [3-n
- alkyl (C ₁₂ or C ₁₄₎ thio propionyloxy] -5-t-butylphenyl] sulfide, 4,4'-
One or more kinds selected from thiobis (3-methyl-6-t-butylphenol) are polymer components 10
The electric wire / cable according to claim 2, which is obtained by mixing 0.05 to 1.0 part by weight with respect to 0 part by weight. 5. The resin composition is a copolymer of ethylene and hexene-1, and a polymer component mainly composed of linear polyethylene having a melting point of at least 120 ° C. Thio-diethylenebis [3- (3,5-
Di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl-tetrakis [3- (3,5
-Di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate, 2,4-bis- (n-octylthio) -6- (4-hydroxy-
One or two selected from (3,5-di-t-butylanilino) -1,3,5-triazine are used in an amount of 0.05 to 0.5 part by weight based on 100 parts by weight of the polymer component and dilaurylthiodipropion. , Dimyristyl thiodipropionate, distearyl thiodipropionate, tetrakis (methylene dodecyl thiopropionate) methane is used in an amount of 0.05 to 0.5 with respect to 100 parts by weight of the polymer component. The electric wire / cable according to claim 1, which is obtained by adding parts by weight. 6. The resin composition is a copolymer of ethylene and hexene-1, and is a linear polyethylene having a melting point of 120 ° C. or higher, a high-pressure radically polymerized polyethylene, an ethylene-vinyl acetate copolymer, and ethylene ethyl acrylate. One or two selected from ethylene copolymers such as a copolymer, an ethylene ethyl methacrylate copolymer, an ethylene methyl methacrylate copolymer, an ethylene propylene rubber, an ethylene butene-1 copolymer, and an ethylene octene rubber.
As an antioxidant, 2,2-thio-diethylenebis [3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate], pentaerythrityl-tetrakis [3
-(3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4-bis- (n- Octylthio) -6- (4-
Hydroxy-3,5-di-t-butylanilino) -1,
One or two kinds selected from 3,5-triazines are added in an amount of 0.05 to 0.5 part by weight based on 100 parts by weight of the polymer component and dilauryl thiodipropionate, dimyristyl thiodipropionate, distearyl thiodipro. A product obtained by adding 0.05 to 0.5 part by weight of one or two kinds selected from pionate and tetrakis (methylenedodecylthiopropionate) methane to 100 parts by weight of a polymer component. 2. Wires and cables according to 2. 7. The insulator according to claim 1, wherein the insulator is cross-linked so that a gel fraction is 40% or more.
Wires and cables according to item 1. 8. Crosslinking agents include dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 2,5-dimethyl-2,5-di (t-
Butylperoxy) hexyne-3, α, α'-bis (t-
8. The insulator is formed of a resin composition to which one or more selected from butylperoxy-m-isopropyl) benzene, butylcumyl peroxide and isopropylcumyl-t-butyl peroxide are added. Wires and cables as described. 9. A graft polymer which is a copolymer of ethylene and hexene-1 and which is obtained by subjecting a polymer component mainly composed of linear polyethylene having a melting point of 120 ° C. or higher to a graft reaction of alkoxysilane in the presence of a radical generator. Is formed on a conductor or a conductor shielding layer as an insulator, and the insulator is cross-linked by contact with moisture. 10. The radical generator as described above, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5.
-Di (t-butylperoxy) hexyne-3, α, α'-
The electric wire / cable according to claim 9, which is used alone or in combination of two or more selected from bis (t-butylperoxy-m-isopropyl) benzene, butylcumyl peroxide, and isopropylcumyl-t-butyl peroxide.