KR100563653B1 - Crosslinkable polyolefin resin composition for insulating high capacity outdoor electric power cable - Google Patents

Abstract

The present invention relates to a crosslinked polyolefin resin composition for high capacity outdoor power cable insulated wire coating.

Based on at least 1 sort (s) of resin chosen from nonpolar polyolefin resin and polar polyolefin resin, or its mixture as a base resin,

20 to 60 parts by weight of at least one compound selected from metal carbonates and hydrated metal compounds, 3 to 10 parts by weight of an organosiloxane (organosiloxan), 0.5 to 1.5 parts by weight of antioxidant, and carbon black 0.5 to 100 parts by weight of the base resin Provided is a cross-linked polyolefin resin composition for coating a high capacity outdoor power cable insulated wire, comprising -2.5 parts by weight and 0.4-2.5 parts by weight of a crosslinking agent.

The crosslinked polyolefin resin composition according to the present invention is very useful for insulating high capacity outdoor power cables due to its excellent tracking inhibitory properties and heat resistance.

Crosslinked Polyolefin Resin, Insulated Wire, Power Cable, Polydimethylsiloxane, Tracking

Description

Cross-linked polyolefin resin composition for high capacity outdoor power cable insulated wire coating {CROSSLINKABLE POLYOLEFIN RESIN COMPOSITION FOR INSULATING HIGH CAPACITY OUTDOOR ELECTRIC POWER CABLE}

The present invention relates to a crosslinked polyolefin resin composition for coating a high capacity outdoor power cable insulated wire, and more particularly, to a high capacity outdoor power cable insulated crosslink having excellent heat resistance and tracking suppression characteristics even when the transmission capacity of the outdoor power cable is increased. It relates to a polyolefin resin composition.

The outdoor power cable refers to the high voltage power cable for underground distribution and the wire used for the overhead line. The high voltage power cable for underground distribution is a complete type of power having conductors, insulators, shielding layers, and sheathing layers. In the case of a cable, an outdoor power cable is a simple wire structure in which only a single layer of material having two functions of an insulator and a sheath is overlaid on a overhead wire, that is, a conductor (spiral) consisting only of a conductor. Therefore, outdoor power cables are all low-voltage applications of 1.1 kV or less, and the reason is that outdoor power cables used for high voltages of 6.6 kV and 22 kV or more are not in high demand. This is because the reliability of both electrical reliability (withstand voltage) and weathering life cannot be guaranteed at the same time.

However, in Korea, the situation is different from that of the United States and various European countries. In the United States and Europe, there is a high demand for outdoor power cables of 1.1 kV or less coated with a black high-filling crosslinking compound (containing 10-30% of carbon black), but in Korea, outdoor use insulated with high voltage black crosslinked polyethylene of 6.6 kV and 22 kV or more High voltage power cables are widely used for overhead lines. The reason for this is that in Korea, there are many mountainous areas and a small area of land where the population is densely populated, and the insulation of overhead lines is required in consideration of forest fire prevention and human injury accidents due to tree contact in the section where high-voltage overhead lines pass. . The insulated overhead wire is called outdoor high voltage (6.6kV class and 22.9kV) power cable, and since it is a high voltage cable used outdoors, the thermal oxidation stability of the cable insulator is generally required for long-term reliability of more than 30 years. In addition, it should have excellent tracking suppression characteristics and weather resistance.

In general, polyolefin polymer materials such as low density polyethylene and linear low density polyethylene are most commonly used as insulation materials for outdoor high voltage power cables because of excellent electrical properties, extrusion processability, and low cost as general purpose polymer resins. In particular, in order to suppress thermal degradation due to heat generated by a voltage applied during operation of a power cable, a crosslinked network structure is generally obtained by mixing polyethylene with a crosslinking agent such as dicumyl peroxide. The crosslinkable polyethylene (XLPE) has many uses as insulation material for power cables.

For example, conventionally, a resin composition combined with polyethylene, a chemical crosslinking agent, an antioxidant, and carbon black for weathering resistance has been generally used as an insulation material for such outdoor high voltage power cables. In order to improve the tracking inhibitory properties of polyolefin resins, conventionally used methods include adding 60-100 PHR of a metal carbonate such as calcium carbonate to a base resin such as ethylene ethyl acrylate or ethylene vinyl acetate (European Patent 0117031A). Alternatively, there is a method of adding a metal hydrate of magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ), and antimony trioxide (European Patent 0592937A2) to obtain tracking inhibitory properties. And a method of adding an inorganic substance such as vanadium.

In the case of commonly used crosslinked polyolefin for power cable insulation, many antioxidants are added to increase thermal oxidation stability of the cable insulator. However, when the antioxidant is used in an appropriate amount or more, the crosslinking efficiency of the cable insulator into the network structure is lowered due to the action of an antioxidant that removes radicals, which are decomposition products of the crosslinking agent that converts the polymer resin into the network structure. Therefore, in the development of the crosslinking composition for power cable insulation, it is important to improve the thermal oxidation stability without reducing the crosslinking efficiency.

On the other hand, the demand for increasing the transmission capacity of the domestic outdoor power cable has been increasing recently. In order to increase the transmission capacity, a method of using a large-scale cable or reducing transmission loss can be considered, but these methods are unrealistic and expensive and uneconomical. If power transmission capacity can be increased by using outdoor power cables of the same standard, there will be many advantages in terms of economic, spatial and environmental aspects. However, if the transmission capacity of the outdoor high voltage power cable of the same standard is increased, the temperature of the cable conductor may increase due to the increase of the current.

Currently, Korea's 22.9kV outdoor high voltage power cable has a maximum continuous cable temperature of 90 ℃ for transmission capacity. Therefore, if the cable continuous temperature rises up to 130 ° C according to the increase of electric current by increasing the transmission capacity, the outdoor high voltage power cable as mentioned above is used due to the deterrence of tracking insulation and deterioration of thermal oxidation stability of the insulator. It can be said that it is unsuitable as an insulating resin composition.

As described above, efforts have been made to improve the thermal oxidation stability, which is a problem that arises when the power capacity of the outdoor power cable is increased, and to solve the problem of the deterioration of the tracking inhibitory property. As a result, antioxidants, UV stabilizers, metal carbonates, or hydration By specifically combining inorganic compounds such as metal compounds and silicone-based polymer resins, a crosslinked polyolefin resin composition having excellent heat resistance and tracking inhibitory properties could be obtained. In the case of using such a resin composition, power transmission is performed on a cable having the same standard as a conventional outdoor high voltage power cable. Even when the capacity is increased up to 40% (cable continuous use temperature 130 ℃), excellent electrical properties, crosslinking properties and thermal oxidation stability, thereby producing a crosslinked polyolefin resin composition for high capacity outdoor power cable insulation of the present invention.

Accordingly, an object of the present invention is to provide a crosslinked polyolefin resin composition for insulation of a high capacity outdoor power cable having excellent heat resistance and tracking suppression characteristics even when increasing the transmission capacity.

According to the invention,

Based on at least 1 sort (s) of resin chosen from nonpolar polyolefin resin and polar polyolefin resin, or its mixture as a base resin,

20 to 60 parts by weight of at least one compound selected from metal carbonates and hydrated metal compounds, 3 to 10 parts by weight of organosiloxane, 0.5 to 1.5 parts by weight of antioxidant, and 0.5 to 2.5 parts by weight of carbon black based on 100 parts by weight of the base resin A crosslinking polyolefin resin composition for covering a high capacity outdoor power cable insulated wire is provided, comprising a portion and 0.4 to 2.5 parts by weight of a crosslinking agent.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The base resin used for the crosslinked polyolefin resin composition of the present invention is a nonpolar or polar polyolefin resin. Examples of the non-polar polyolefin-based resins include polyethylene resins made of linear low-density polyethylene and metallocene catalysts such as low density polyethylene (LDPE) and ethylene-alpha-olefin copolymers having a melt index of 0.1-4 g / 10 min, and ethylene-propylene. Rubber, ylene-propylene-diene rubber, and the like, and the polar polyolefin-based resin may be an ethylene vinyl acetate copolymer having a vinyl acetate content of less than 30% by weight and a melt index of 10 g / 10 minutes or less, and an ethyl acrylate content of 25 Ethylene copolymers such as ethylene ethyl acrylate (EEA) copolymers having a weight index of less than 6 and a melt index of 6 or less, or ethylene methacrylate copolymers having a methyl acrylate content of less than 30 weight% and a melt index of 6 or less may be used.

In addition, the brand resin mixed with the non-polar polyolefin resin and the polar polyolefin resin may be used as the base resin, the mixing ratio is not particularly limited, but the ratio of the non-polar polyolefin resin when the brand resin is used as the base resin When the amount exceeds 40 parts by weight, the physical properties of the composition may be deteriorated, and it is preferable that the proportion of the nonpolar polyolefin resin in the brand resin does not exceed 40 parts by weight.

At least one compound selected from the metal carbonates and the hydrated metal compounds used in the present invention is mixed with the composition of the present invention to improve tracking inhibitory properties and to increase heat resistance, and to 20 parts by weight of the base resin. Mixed to -60 parts by weight In this case, when the amount of the compound is less than 20 parts by weight, the desired tracking inhibitory property cannot be obtained. Also, when the amount of the compound is 60 parts by weight or more, the mechanical properties after crosslinking of the composition may be lowered and the extrusion processability may be deteriorated. If a hydration metal compound is used, the decomposition temperature is 170-435 ° C., the endothermic amount is 200-470 cal / g, and MnOm XH ₂ O (wherein M is a metal and m and n are each a metal) The valence of is an integer of 1 or 2 or more, and X is the number of molecules of the number of bonds) is preferably a hydrated metal compound, for example magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ) ₃ ) and calcium hydroxide (Ca (OH) ₂ ), and the like.

The organosiloxane used in the present invention, when mixed with the metal carbonate or the metal hydride compound, not only improves the extrusion processability of the composition, but also hardens the solids of the carbide mass in which the metal hydride compound is decomposed by heat when the tracking occurs. It also plays an additional role in enhancing the function of suppressing the progress of tracking generated in the insulator. Accordingly, even when a small amount of the metal carbonate or the hydration metal compound is used, the tracking inhibition property may be increased by the polydimethylsiloxane. Moreover, the polydimethylsiloxane prevents side effects such as deterioration of the mechanical properties of the composition caused by the use of a large amount of metal carbonate or metal hydride compound to increase the tracking inhibitory properties.

The organosiloxane is included in 3-10 parts by weight based on 100 parts by weight of the base resin. If the amount of organosiloxane is less than 3 parts by weight, it does not affect the extrudability and tracking suppression characteristics. If it is included more than 10 parts by weight, slippage may occur during cable extrusion, resulting in a decrease in extrusion processability. In addition, the miscibility of other included materials may be deteriorated, resulting in the adverse effect of lowering the mechanical properties of the composition.

The organosiloxanes include R ₃ SiO _0.5 , R ₂ SiO, R ¹ SiO _1.5 , R ¹ R ₂ SiO _0.5 , RR ¹ SiO, R ¹ ₂ SiO, RSiO _1.5 and SiO ₂ , where R is a saturated or unsaturated hydrocarbon radical R ¹ is a silicone-based polymer resin having a siloxy group selected from the group consisting of R or a radical selected from the group consisting of hydrogen atoms, hydroxyl, alkoxy, aryl, vinyl or allyl radicals. Organosiloxanes useful in the present invention are in the form of silicone fluids and gums. In particular, organosiloxanes useful in the present invention are polydimethylsiloxanes.

In addition, the organosiloxane may preferably contain up to 50% of inorganic silica in order to exhibit high hardness.

Antioxidant used in the present invention serves to increase the thermal oxidation stability of the composition, it is included in 0.5 to 1.5 parts by weight based on 100 parts by weight of the base resin. If the antioxidant is contained in less than 0.5 parts by weight can not affect the good thermal stability at high temperatures, if contained in more than 1.5 parts by weight of the cross-linking agent composition to remove the radicals of the cross-linking agent This results in lowering the crosslinking efficiency of the composition, rather lowering the thermal oxidation stability. Preferably, the antioxidant is 4,4 'di (α, α-dimethylbenzyl) diphenylamine which is an aromatic amine antioxidant and tetrakis methylene (3,5-di- which is a hindered phenolic antioxidant. Tert-butyl 4-hydroxyhydrocinnamate) methane mixed in a ratio of 1: 1 is used. The mixed antioxidant as described above has little effect of reducing the crosslinking efficiency at the time of crosslinking of the crosslinking composition, and excellent in heat resistance of the crosslinking composition.

Carbon black used in the present invention is included to improve the weather resistance of the wire or cable coating, it is included in 0.5 to 2.0 parts by weight based on 100 parts by weight of the base resin. If the carbon black content is 0.5 parts by weight or less, the UV blocking effect is insignificant, and 2.5 parts by weight or more may adversely affect the withstand voltage and tracking characteristics. Preferably, carbon blacks having good UV blocking ability, generally having a surface area of 85-105 cm 2 / g, particle size 15-22 nm, density 0.01-0.05 g / cm 3, pH 4.0 or less, are useful in the present invention.

The crosslinking agent used in the present invention is an additive which is basically used to crosslink the insulator in a vulcanization tube to increase the physical properties and heat resistance for insulation purposes under high pressure when the outdoor high voltage power cable is insulated, and may be used alone or in combination with a crosslinking accelerator. The crosslinking agent is included in an amount of 0.4-2.5 parts by weight based on 100 parts by weight of the base resin. If the crosslinking agent content is 0.4 parts by weight or less, sufficient crosslinking properties cannot be obtained. At 2.5 parts by weight or more, the scorch stability is lowered during extrusion for cable production. Dicumylperoxide (DCP), the most commonly used crosslinking agent, can be used, such as di- (2-t-butylperoxyisopropyl) benzene or di- (2-thi-butylperoxyisopropyl) benzene. Organic peroxides can be used in the present invention.

Furthermore, an ultraviolet stabilizer may additionally be added to the composition of the present invention. The UV stabilizer not only provides stability to the crosslinked polyolefin resin composition but also has a small effect on the crosslinking efficiency of the crosslinked polyolefin-based resin composition when used in an appropriate amount, and has a synergistic effect of increasing thermal stability at high temperatures. As a result, the high temperature thermal stability of the resin composition of the crosslinked polyolefin is further improved. The UV stabilizer may be added at 0.2-1.0 parts by weight based on 100 parts by weight of the base resin. If it is added less than 0.2 parts by weight can not have a good effect on the thermal stability of the composition, when added to more than 1.0 parts by weight does not increase the effect any more uneconomical. Preferably, the UV stabilizer is added at 0.3-0.7 parts by weight based on 100 parts by weight of the base resin. As a UV stabilizer useful in the present invention, a poly [6-morpholino-s-triazine-2,4-diyl) which is a hindered amine light stabilizer [(2,2,6,6-tetramethyl-4-piperidyl ) Imino] -hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]] can be used.

In addition, when using the brand resin which mixed nonpolar polyolefin resin and polar polyolefin resin, a compatibilizer can be used in order to improve the compatibility between each resin. In addition, to prepare a cross-linked polyolefin resin composition of a variety of colors, it may exclude the carbon black and include a pigment.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example

Method of implementation

Each material was added to a Banbury mixer maintained at 100 to 120 ° C. as shown in Table 1 below, mixed uniformly for 15 minutes, and extruded into an extruder to granulate. The granulated composition is then impregnated with a crosslinking agent in a Henschel mixer to complete the preparation of the crosslinked polyolefin resin composition.

Test Items

1) Room temperature tensile property

After the crosslinked polyolefin resin composition was crosslinked in a molding machine for 20 minutes at 175 ° C, tensile strength and elongation, which are room temperature mechanical properties, were measured according to ASTM D 638 for the crosslinked specimen.

2) Residual Tensile Characteristics after Heating

The crosslinked polyolefin resin composition was crosslinked in a molding machine for 20 minutes at 175 ° C., and then heated and aged at 180 ° C. and 168 hours for the crosslinked specimen, and then tensile strength and elongation residual ratio, which are room temperature mechanical properties, were measured according to ASTM D 638.

3) Tracking Suppression Characteristics

After the crosslinked polyolefin resin composition was crosslinked in a molding machine at 175 ° C. for 20 minutes, the crosslinked specimens were evaluated for tracking inhibition properties according to ASTM D 2303-73.

<Comparative Examples 1 and 2>

100 parts by weight of the low density polyethylene (LDPE) copolymer was used as the base resin (Comparative Example 1), and 100 parts by weight of the ethylene ethyl acrylate (EEA) copolymer was used as the base resin (Comparative Example 2), and 0.5 parts by weight of antioxidants were respectively added. , 0.5 parts by weight of carbon black and 2.0 parts by weight of crosslinking agent were prepared according to the above method using a Banbury mixer and Henschel mixer to prepare a polyolefin composition.

<Comparative Examples 3 and 4>

100 parts by weight of the low density polyethylene (LDPE) copolymer was used as the base resin (Comparative Example 3) and 100 parts by weight of the ethylene ethyl acrylate (EEA) copolymer was used as the base resin (Comparative Example 4), and magnesium hydroxide (Mg ( OH) ₂ ) 50 parts by weight, 0.5 parts by weight of antioxidant, 0.5 parts by weight of carbon black and 2.0 parts by weight of crosslinking agent to prepare a polyolefin composition using a Banbury mixer and Henschel mixer according to the above method.

Comparative Example 5

A polyolefin composition was prepared in the same manner as in Comparative Example 4, except that magnesium hydroxide (Mg (OH) ₂ ) was increased to 100 parts by weight.

Invention Example 1

100 parts by weight of a low density polyethylene (LDPE) copolymer is used as a base resin, and 50 parts by weight of magnesium hydroxide (Mg (OH) ₂ ), 6.5 parts by weight of polydimethylsiloxane, 0.5 parts by weight of antioxidant, 0.5 parts by weight of carbon black, and 2.0 parts by weight of the crosslinking agent was prepared according to the above method using a Banbury mixer and Henschel mixer to prepare a polyolefin composition.

Invention Example 2

A polyolefin composition was prepared in the same manner as in Example 1, except that 100 parts by weight of ethylene ethyl acrylate (EEA) copolymer was used as the base resin.

Invention Example 3

A polyolefin composition was prepared in the same manner as in Example 1, except that 100 parts by weight of ethylene ethyl acrylate (EEA) copolymer was used as the base resin and the polydimethylsiloxane was increased to 13 parts by weight.

Invention Example 4

A polyolefin composition was prepared in the same manner as in Inventive Example 1, except that the antioxidant was increased to 1.5 parts by weight.

Invention Example 5

Inventive Example 1 except that 100 parts by weight of a resin mixture composed of 30 parts by weight of a low density polyethylene (LDPE) copolymer and 70 parts by weight of an ethylene ethyl acrylate (EEA) copolymer was used as a base resin, and an antioxidant was increased to 1.5 parts by weight. In the same manner as in the polyolefin composition was prepared.

Invention Example 6

A polyolefin composition was prepared in the same manner as in Example 1, except that 100 parts by weight of an ethylene ethyl acrylate (EEA) copolymer was used as a base resin and an antioxidant was increased to 1.5 parts by weight.

Invention Example 7

A polyolefin composition was prepared in the same manner as in Example 1, except that 100 parts by weight of an ethylene ethyl acrylate (EEA) copolymer was used as a base resin, and an antioxidant was increased to 3.0 parts by weight.

Invention Example 8

Polyolefin in the same manner as in Inventive Example 1, except that 100 parts by weight of ethylene ethyl acrylate (EEA) copolymer was used as the base resin, 1.5 parts by weight of antioxidant was added, and 0.5 parts by weight of UV stabilizer was additionally added. The composition was prepared.

Invention Example 9

Polyolefin in the same manner as in Inventive Example 1, except that 100 parts by weight of ethylene ethyl acrylate (EEA) copolymer was used as the base resin, 1.5 parts by weight of antioxidant was added, and 0.8 parts by weight of UV stabilizer was additionally added. The composition was prepared.

Materials and properties Comparative example Inventive Example One 2 3 4 5 One 2 3 4 5 6 7 8 9 LDPE ¹ 100 - 100 - - 100 - - 100 30 - - - - EEA ² - 100 - 100 100 - 100 100 - 70 100 100 100 100 Mg (OH) ₂ ³ - - 50 50 100 50 50 50 50 50 50 50 50 50 Polydimethylsiloxane ⁴ - - - - - 6.5 6.5 13 6.5 6.5 6.5 6.5 6.5 6.5 Antioxidants ⁵ 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 1.5 1.5 1.5 3.0 1.5 1.5 UV Stabilizer ⁶ - - - - - - - - - - - - 0.5 0.8 Carbon black 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Crosslinking agent 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Tracking Suppression Characteristics (Time-to-Trac) 22 19 320 300 380 440 430 490 455 425 440 435 455 450 Room temperature tensile properties Tensile Strength (kg / ㎠) 210 240 130 200 160 120 190 170 125 150 190 165 195 190 Elongation (%) 550 600 420 530 490 400 520 480 390 480 510 520 520 515 Tensile Properties After Heating Tensile Strength Residual (%) 5% less than 5% less than 5% less than 5% less than 5% less than 5% less than 5% less than 5% less than 83 85 85 73 96 105 Elongation Residual Rate (%) 5% less than 5% less than 5% less than 5% less than 5% less than 5% less than 5% less than 5% less than 81 83 80 66 95 98

1.LDPE (Low Density Polyethylene): Hanwha Petrochemical (Density 0.920g / cm3, MI 2.0g / 10min)

2. EEA (ethylene ethyl acrylate): Japanese petrochemical product (EA content 15%, MI 0.5g / 10min)

3. Mg (OH) ₂ : Japanese TMG company, product name Finemag MOT

4. Polydimethylsiloxane: Dow Corning (Silicone Gum)

5. Antioxidant: Uniroyal, Naugard HM 11

6. UV stabilizer: Cytec, product name Cyasorb UV-3346

7.Crosslinker: AKZO-NOVEL company, product name PERKADOX14

As can be seen from Table 1, the specimen prepared from the resin composition of Inventive Examples 1-9 prepared with the composition according to the present invention has excellent tracking suppression characteristics, in particular, foot Honor 4-9 shows remarkably excellent tensile properties, ie heat resistance after heating (180 ℃, 168 hours heating), which is very useful for insulated high capacity outdoor power cables.

The crosslinked polyolefin resin composition according to the present invention is very useful for insulating high capacity outdoor power cables due to its excellent tracking inhibitory properties and heat resistance.

Claims (8)

Based on at least 1 sort (s) of resin chosen from nonpolar polyolefin resin and polar polyolefin resin, or its mixture as a base resin, 20 to 60 parts by weight of at least one compound selected from metal carbonates and hydrated metal compounds, 3 to 10 parts by weight of organosiloxane, 0.5 to 1.5 parts by weight of antioxidant, and 0.5 to 2.5 parts by weight of carbon black based on 100 parts by weight of the base resin Crosslinking polyolefin resin composition for coating a high capacity outdoor power cable insulated wire, characterized in that it comprises a portion and 0.4-2.5 parts by weight of a crosslinking agent. The crosslinked polyolefin resin composition for coating a high capacity outdoor power cable insulated wire according to claim 1, wherein the nonpolar polyolefin resin is low density polyethylene (LDPE). The crosslinked polyolefin resin composition for coating a high capacity outdoor power cable insulated wire according to claim 1, wherein the polar polyolefin resin is ethylene ethyl acrylate (EEA). The method of claim 1, wherein the organosiloxane is R ₃ SiO _0.5 , R ₂ SiO, R ¹ SiO _1.5 , R ¹ R ₂ SiO _0.5 , RR ¹ SiO, R ¹ ₂ SiO, RSiO _1.5 and SiO ₂ , wherein R is A saturated or unsaturated hydrocarbon radical, R ¹ represents a radical selected from the group consisting of R or a radical selected from the group consisting of hydrogen atoms, hydroxyl, alkoxy, aryl, vinyl or allyl radicals) Crosslinked polyolefin resin composition for high capacity outdoor power cable insulated wire coating, characterized in that the silicone-based polymer resin. The crosslinked polyolefin resin composition for coating a high capacity outdoor power cable insulated wire according to claim 1, wherein the organosiloxane is polydimethylsiloxane. The method of claim 1, wherein the antioxidant is 4,4 'di (α, α- dimethylbenzyl) diphenylamine which is an aromatic amine antioxidant and tetrakis methylene (3,5-di-) which is a hindered phenolic antioxidant. Tert-Butyl 4-hydroxyhydrocinnamate) methane is mixed in a ratio of 1: 1, cross-linked polyolefin resin composition for high capacity outdoor power cable insulated wire coating. The crosslinked polyolefin resin composition according to claim 1, further comprising 0.2-1.0 parts by weight of an ultraviolet stabilizer based on 100 parts by weight of the base resin. The method of claim 7, wherein the UV stabilizer is a poly [6-morpholino-s-triazine-2,4-diyl) [(2,2,6,6-tetramethyl-4] is a hindered amine light stabilizer -Piperidyl) imino] -hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]]. A crosslinked polyolefin resin composition for coating a high capacity outdoor power cable insulated wire.