KR20190000063A - Halogen-free insulating composition with excellent low-teperature resistance and oil resistance and cable having a dielectric layer formed from the same - Google Patents

Abstract

The present invention relates to a halogen-free insulating composition with excellent low-temperature resistance and oil resistance, and a wire having an insulating layer formed therefrom. Specifically, the present invention relates an insulating composition which is not only excellent in oil resistance, chemical resistance, low-temperature resistance, insulating properties, etc. which are difficult to secure at the same time, but also is excellent in flame retardancy and is eco-friendly even if a halogen-free retardant is in use, and a wire having an insulating layer formed therefrom. To this end, the insulating composition comprises an ethylene vinyl acetate resin and an ethylene propylene diene rubber resin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen-free insulating composition excellent in cold resistance and oil resistance, and an insulating layer formed therefrom,

The present invention relates to a non-halogen insulating composition excellent in cold resistance and oil resistance, and to an electric wire including an insulating layer formed therefrom. Specifically, the present invention is not only excellent in oil resistance, chemical resistance, cold resistance, insulation, and the like, which are difficult to secure at the same time, but also provides an insulating composition having excellent flame retardancy, environmental friendliness, And an insulating layer formed therefrom.

Wires used in railway vehicles, ships, and automobiles are required to have oil resistance, chemical resistance, chemical resistance and cold resistance depending on their use environment.

Conventional wires for railway vehicles use ethylene vinylacetate (EVA) resin or the like to form an insulating layer thereon. The ethylene vinyl acetate (EVA) resin is excellent in oil resistance and chemical resistance because it contains a polar group that acts to push out oil components and lipophilic compounds, and the like. On the other hand, there is a problem that insulating property is insufficient and cold resistance is insufficient due to the polar group I have.

Therefore, the ethylene vinyl acetate (EVA) resin is mixed with the nitrile-butadiene rubber However, in such a case, the cold resistance and the insulation property are somewhat improved, while the oil resistance is greatly deteriorated.

Further, it is possible to consider applying an engineering plastic resin or high-density polyethylene resin such as a high-priced polyester which simultaneously satisfies both oil resistance, chemical resistance, cold resistance and insulation, but these resins have a high processing temperature, When performing chemical crosslinking using a crosslinking agent having a low temperature, premature crosslinking may occur before molding of the resin. In addition, these resins have a very high hardness and are stiff so that flexibility and cold resistance are greatly reduced. Workability such as workability, workability, and the like is significantly lowered and it is difficult to apply to an environment of a low temperature, for example, electric wires used at -50 ° C.

On the other hand, a flame retardant is added to the insulating composition forming the insulating layer of the electric wire in order to secure the flame retardancy of the electric wire for a railway vehicle. When the halogen flame retardant is conventionally used, excellent flame retardancy can be ensured, There is a problem that environmental pollution such as generation of toxic gas occurs during incineration for disposal of electric wires included.

Accordingly, there is provided a composition for forming an insulation layer of a wire for a new railway vehicle excellent in oil resistance, chemical resistance, cold resistance and insulation properties at the same time, which is excellent in flame retardancy and is environmentally friendly and excellent in workability, There is an urgent need for an electric wire to be included.

It is an object of the present invention to provide an electric wire including an insulating composition excellent in oil resistance, chemical resistance, cold resistance, insulation and the like, and an insulating layer formed therefrom.

It is also an object of the present invention to provide an electric wire including an insulating composition having sufficient flame retardancy and being environmentally friendly and an insulating layer formed therefrom.

Further, it is an object of the present invention to provide an electric wire including an insulating composition having excellent processability, workability, and the like, and an insulating layer formed therefrom, while reducing manufacturing cost.

In order to solve the above problems,

Wherein the insulating layer formed from the insulating composition has a tensile elongation at break of at least 30% after cooling at -50 캜 for 4 hours and a tensile elongation at break of 70 캜 Wherein the residual tensile strength and elongation percentage after immersing in IRM 903 oil for 168 hours are 60 to 140%, respectively.

Wherein said ethylene vinyl acetate resin comprises an ethylene vinyl acetate resin having a vinyl acetate monomer content of at least 50 wt% and an ethylene vinyl acetate resin grafted with maleic anhydride .

The content of the ethylene vinyl acetate resin in which the content of the vinyl acetate monomer is 50% by weight or more is 40 to 60 parts by weight based on 100 parts by weight of the base resin, and the content of the ethylene vinyl acetate resin in which the maleic anhydride is grafted Is 10 to 20 parts by weight, and the content of the ethylene-propylene-diene rubber resin is 30 to 50 parts by weight.

Further, the ethylene-propylene-diene rubber resin has an Mooney viscosity of 20 to 30.

Wherein the ethylene propylene diene rubber resin has an ethylene monomer content of 60 wt% or less based on the total weight of the ethylene propylene diene rubber resin.

Based on 100 parts by weight of the base resin, 100 to 150 parts by weight of a non-halogen flame retardant.

Here, the non-halogen flame retardant is an insulation composition comprising magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ), or both.

Further, the magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ), or both of them are surface-modified with alkylsilane, vinylsilane, stearic acid, oleic acid or aminopolysiloxane, Lt; / RTI > to 2.2 mu m.

On the other hand, based on 100 parts by weight of the base resin, di-2-ethylhexyl adipate (DOA), di-2-ethylhexyl sebacate (DOS), di- wherein the composition further comprises 5 to 20 parts by weight of at least one plasticizer selected from the group consisting of ethylhexyl azelate (DOZ) and trioctyl trimellitate (TOTM).

And 2 to 6 parts by weight of an organic peroxide crosslinking agent based on 100 parts by weight of the base resin.

Also provided is an insulation composition, which further comprises a flame retardant aid, a crosslinking aid, an antioxidant, a processing aid or a combination thereof.

On the other hand, And an insulating layer surrounding the conductor and formed from the insulating composition.

The non-halogen insulating composition excellent in cold resistance and oil resistance according to the present invention exhibits an excellent effect of simultaneously improving oil resistance, chemical resistance, cold resistance and insulation through a blending resin of a specific resin as a base resin.

In addition, the non-halogen insulating composition having excellent cold resistance and oil resistance according to the present invention exhibits excellent effects of being flame retardant and environmentally friendly, even though a non-halogen flame retardant is used.

Furthermore, the non-halogen insulating composition having excellent cold resistance and oil resistance according to the present invention exhibits an excellent effect of reducing the manufacturing cost and improving the workability and workability through the incorporation of a specific base resin.

1 schematically shows an embodiment of a wire formed from a non-halogen insulating composition having excellent cold resistance and oil resistance according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

The non-halogen insulating composition having excellent cold resistance and oil resistance according to the present invention can include ethylene vinyl acetate (EVA) resin and rubber resin as a base resin.

The ethylene vinyl acetate (EVA) resin is a copolymer of ethylene vinyl acetate (EVA) resin and maleic anhydride grafted with an ethylene vinyl acetate (EVA) resin having a vinyl acetate monomer content of at least 50 wt%, for example, 50 to 80 wt% and grafted ethylene vinyl acetate (EVA).

The vinyl acetate monomer contained in the ethylene vinyl acetate (EVA) resin improves the oil resistance of the insulating composition as a polar monomer, and when the content of the vinyl acetate monomer is less than 50% by weight, the oil resistance of the insulating composition sharply decreases .

Also, ethylene vinyl acetate (EVA) grafted with maleic anhydride has a function of enhancing the compatibility of the base resin with an inorganic flame retardant described later, thereby realizing excellent flame retardancy by a relatively small amount of flame retardant .

On the other hand, the above-mentioned rubber resin may be any one of natural rubber, styrene butadiene rubber (SBP), butadiene rubber (BR), chloroprene rubber (CR), nitrile butadiene rubber (NBR), butyl rubber, ethylene propylene diene rubber And may include at least one rubber resin selected from the group consisting of polyethylene rubber (CSM), acrylic rubber, fluorine rubber, silicone rubber and the like, preferably ethylene propylene diene rubber (EPDM).

The rubbery resin may have a Mooney viscosity of 20 to 30, and in particular, the ethylene propylene diene rubber (EPDM) has an ethylene monomer content of not more than 60% by weight based on the total weight thereof, so as to have a Mooney viscosity of 20 to 30, For example, 10 to 60 wt%, and the content of the ethylene monomer is limited to 60 wt% or less, whereby the crystallinity of the rubber resin can be controlled to improve the cold resistance of the insulating composition. If the Mooney viscosity of the rubber resin is less than 20, the cold resistance and mechanical properties of the insulating composition may be lowered. On the other hand, if the rubber composition has an Mooney viscosity of more than 30, the flexibility, cold resistance, filler loading property, Can be degraded.

The content of an ethylene vinyl acetate (EVA) resin having a vinyl acetate content of not less than 50% by weight as a resin not grafted with maleic anhydride in the ethylene vinyl acetate (EVA) resin is 40 to 60 parts by weight based on 100 parts by weight of the base resin , The content of the ethylene vinyl acetate (EVA) resin in which maleic anhydride is grafted in the ethylene vinyl acetate (EVA) resin is 10 to 20 parts by weight, and the content of the rubber resin is 30 to 50 parts by weight.

If the content of the ethylene vinyl acetate (EVA) resin not grafted with maleic anhydride is less than 40 parts by weight, the oil resistance of the insulating composition may be lowered, while if it exceeds 60 parts by weight, the cold resistance of the insulating composition may be deteriorated Also, flexibility may be lowered, and workability such as electric wire including the insulating layer formed therefrom, workability such as workability may be lowered.

The insulating composition according to the present invention simultaneously improves the oil resistance, chemical resistance, cold resistance, and insulation which can not simultaneously be achieved by adjusting the blending ratio of the specific resin and the Mooney viscosity and the polar monomer content of the resin constituting the base resin It is possible to exhibit an excellent effect.

The insulating composition according to the present invention may further comprise a flame retardant. The flame retardant may include a nonhalogen-based inorganic flame retardant such as magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ) Since the inorganic flame retardant such as magnesium hydroxide is hydrophilic with high surface energy, while the base resin is hydrophobic with low surface energy, the flame retardant has poor dispersibility with respect to the base resin, and water resistance, electrical characteristics And the like can be adversely affected.

Accordingly, in order to solve such a problem, it is preferable that the inorganic flame retardant such as magnesium oxide is surface-modified with alkylsilane, vinylsilane, stearic acid, oleic acid, aminopolysiloxane, or the like. When the flame retardant is surface-modified by vinyl silane or the like, a hydrolytic group such as vinyl silane is attached to the surface of the flame retardant such as magnesium hydroxide by chemical bonding, and the silane group reacts with the base resin to secure excellent dispersibility And the excellent flame retardancy of the insulating composition can be realized.

The inorganic flame retardant preferably has a Mohs hardness of 2 to 3 and an average particle size (D ₅₀ ) of 0.9 to maintain dispersibility in the insulating composition while maintaining its shape and function in the process of extruding the insulating layer with the insulating composition. To 2.2 탆.

When the average particle size (D ₅₀ ) of the inorganic flame retardant is less than 0.9 탆, the dispersibility of the inorganic flame retardant to the base resin is lowered and the viscosity of the insulating composition is increased, so that the combination of the base resin and the inorganic flame retardant And the elongation percentage of the insulating composition is lowered. On the other hand, when the thickness is more than 2.2 탆, the bond between the base resin and the additive is weakened and the physical properties of the insulating composition may be greatly deteriorated.

The inorganic flame retardant may be added in an amount of 100 to 150 parts by weight based on 100 parts by weight of the base resin. If the content of the inorganic flame retardant is less than 100 parts by weight, the flame retardancy of the insulating composition may not be satisfied. If the content of the inorganic flame retardant exceeds 150 parts by weight, both the room temperature property and the cold resistance of the insulating composition may be deteriorated. The insulating composition may further comprise 5 to 20 parts by weight of a zinc borate-based auxiliary flame retardant based on 100 parts by weight of the base resin.

Since the insulating composition contains a non-halogen flame retardant as a flame retardant, it is environmentally friendly, unlike a conventional insulation composition comprising a halogen-based flame retardant, maximizes dispersibility of the flame retardant to the base resin, It is possible to effectively inhibit deterioration of other physical properties which are equivalent to or superior to those of the insulating composition.

The insulating composition may further comprise a plasticizer. Examples of the plasticizer include di-2-ethylhexyl adipate (DOA), di-2-ethylhexyl sebacate (DOS), di-2-ethylhexyl azelate (DOZ) , Trioctyl trimellitate (TOTM), etc., and the cold resistance, extrudability, etc. of the insulating composition can be improved.

The plasticizer may be included in an amount of 5 to 20 parts by weight based on 100 parts by weight of the base resin. When the content of the plasticizer is less than 5 parts by weight, the cold resistance of the insulating composition may be deteriorated. On the other hand, The tensile strength at room temperature of the composition is lowered and the melt viscosity is excessively lowered, so that the extrusion moldability may be deteriorated.

The insulating composition according to the present invention may include a crosslinking agent for crosslinking the base resin, and may further include a crosslinking aid. The crosslinking agent may be a silane crosslinking agent or a crosslinking agent such as dicumylperoxide, benzoylperoxide, laurylperoxide, t-butylcumylperoxide, di (t-butylperoxyisopropyl) 5-dimethyl-2,5-di (t-butylperoxy) hexane, di-t-butyl peroxide and the like.

Particularly, when the base resin constituting the insulating composition according to the present invention is crosslinked by a chemical crosslinking method using an organic peroxide-based crosslinking agent such as dicumyl peroxide, the organic peroxide crosslinking agent preferably has a pyrolysis initiation temperature of 110 to 180 ° C Do. When the organic peroxide-based cross-linking agent has a pyrolysis initiation temperature as described above, it can not be decomposed during extrusion molding of the insulating composition, thereby ensuring stable process conditions.

The content of the crosslinking agent may be 2 to 5 parts by weight based on 100 parts by weight of the base resin. If the content of the crosslinking agent is less than 2 parts by weight, the crosslinking degree of the base resin may be decreased and the oil resistance and the room temperature strength of the insulating composition may be lowered. On the other hand, If it is more than 1 part by weight, the insulating composition may be deteriorated in elongation and cold resistance of the insulating composition due to side reaction through excessive crosslinking, and premature crosslinking may occur during processing.

The crosslinking aid may be selected from the group consisting of triallyisocyanurate, triallycyanurate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate and the like. And may include one or more selected crosslinking aids.

The crosslinking aid may increase the activity of the crosslinking agent to increase the degree of crosslinking, thereby lowering the content of the crosslinking agent. The content of the crosslinking aid may be 2 to 6 parts by weight based on 100 parts by weight of the base resin.

The insulating composition according to the present invention may further contain other additives such as an antioxidant, a processing aid, and the like. In particular, the antioxidant may include an antioxidant such as a phenol-based or amine-based antioxidant, and the amount of the antioxidant may be 0.5 to 2 parts by weight based on 100 parts by weight of the base resin. The content of the processing aid may be 0.5 to 2 parts by weight based on 100 parts by weight of the base resin.

The above-described insulating composition simultaneously satisfies both cold resistance and oil resistance which are in conflict with each other due to mixing of the specific base resin and the specific additive. Specifically, the insulating layer formed from the insulating composition is cooled at -50 캜 for 4 hours It is excellent in cold resistance at an elongation at stretching of 30% or more and excellent in oil resistance as measured by immersing in IRM 903 oil at 70 캜 for 168 hours and having a residual tensile strength and elongation percentage of 60 to 140%.

The present invention relates to a wire comprising an insulating layer formed by the above-described insulating composition. 1 schematically shows an embodiment of a wire formed from a non-halogen insulating composition having excellent cold resistance and oil resistance according to the present invention.

As shown in FIG. 1, a wire according to the present invention may include a conductor 10 and an insulating layer 20 surrounding it. Here, the conductor 10 may be made of a conductive metal such as copper or aluminum, and preferably made of copper. The conductor 10 may be a single wire or a twisted wire obtained by twisting a plurality of single wires. In addition, the insulating layer 20 may be formed from a non-halogen insulating composition having excellent cold resistance and oil resistance according to the present invention.

The electric wire according to the present invention may further include a tape layer between the conductor 10 and the insulating layer 20 in order to suppress the penetration of the insulating composition into the conductor 10 in the process of extruding the insulating layer 20 As shown in FIG. The tape layer may be made of a material such as nylon or polyethylene terephthalate (PET).

[Example]

1. Manufacturing Example

The insulating composition according to each of Examples and Comparative Examples was prepared by kneading in an open roll at the components and mixing ratios shown in Table 1 below, followed by crosslinking by heating at 170 DEG C for 20 minutes to obtain IEC 60811-1-1 To prepare an insulating specimen. The unit of the content shown in Table 1 below is parts by weight.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Resin a 50 50 50 50 50 50 50 50 50 Resin b 35 35 40 35 40 40 35 35 Resin c 35 Resin d 15 15 10 15 15 10 10 15 15 Flame Retardant a 60 130 130 60 Flame retardant agent b 120 70 130 90 170 70 Flame retardant c 130 Plasticizer 10 10 10 10 10 10 10 10 Antioxidant One One One One One One One One One Crosslinking aid 4 4 4 4 4 4 4 4 4 Cross-linking agent 3 3 3 3 3 3 3 3 3

Resin a: ethylene vinyl acetate resin (vinyl acetate content: 70 占 .5% by weight, density: 1.08)

Resin b: ethylene propylene diene rubber (ML1 + 4 @ 125 DEG C = 27, ethylene content: 51% by weight, density: 0.860)

Resin c: ethylene propylene diene rubber (ML1 + 4 @ 125 DEG C = 59, ethylene content: 70% by weight, density: 0.860)

Flame retardant a: surface treated with vinyl silane Aluminum hydroxide (average particle size _{(D 50): 1.3 ~ 2.2} ㎛)

Flame retardant b: Aluminum hydroxide (average particle diameter (D ₅₀ ): 0.9 to 1.5 탆) surface-treated with vinylsilane

Flame retardant c: common aluminum hydroxide (average particle size (D _50): 0.9 ㎛)

Antioxidants: Phenolic antioxidants

Crosslinking aid: trimethylolpropane trimethacrylate (TMPTMA)

Crosslinking agent: Dicumylperoxide

2. Property evaluation

The following physical properties of the insulating specimens according to the Examples and Comparative Examples prepared in the above Production Examples were evaluated, and the results are shown in Table 2 below.

1) Evaluation of tensile strength and elongation at room temperature

The tensile strength at room temperature and elongation at room temperature were evaluated for each of the insulating specimens of the examples and comparative examples at a rate of 250 mm / min in accordance with standard IEC 60811-1-1.

2) Evaluation of oil resistance

For the IRM 903 oil specified in IEC 60811-2-1, the insulation specimens according to each of the examples and comparative examples were immersed at 70 ° C for 168 hours. The tensile strength and elongation were measured and compared with the initial values, The same time was expressed as 100%, and oil resistance was evaluated through the degree of change in tensile strength and elongation.

3) Cold resistance evaluation

Five insulating specimens according to Examples and Comparative Examples were prepared in a size of 2.0 ± 0.2 mm in thickness, 6.0 ± 0.4 mm in width and 38.0 ± 2 mm in length according to KS C 3004, Min for 30 seconds in an ethyl alcohol solution. One or more splits are called breaks, and gold or cracks are not breaks. The evaluation results are shown in the form of 0/0/0, showing the surface cracks / internal cracks / number of specimens separated from each of the five specimens. If the result of the measurement at -50 ° C is 0/2/3 or higher, it is acceptable.

4) Evaluation of insulation

The insulating properties of each of the insulating specimens of Examples and Comparative Examples were evaluated by measuring the volume resistance according to IEC 60811 standard.

5) Evaluation of flame retardancy

The flame retardancy was evaluated by measuring the oxygen index for each of the insulating specimens of the examples and comparative examples according to the specifications IEC 60332-1-2 and EN 50305.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Prize
On The tensile strength
(MPa) 13.00 12.62 12.58 10.33 10.48 9.63 11.65 9.09 14.63 Elongation rate
(%) 151.46 181.2 172.79 216.24 222.01 159.38 196.13 146.66 116.5 of mine
U
castle Tensile Residue (%) 70.46 80.73 74.81 80.91 89.23 67.54 73.57 73.87 78.04 Renal survival rate (%) 66.37 71.05 67.86 63.81 69.8 50.8 62.4 64.96 70.36 Cold resistance -45 ° C 0/2/0 0/1/0 0/2/0 1/0/0 0/0/5 0/1/4 1/0/0 0/1/4 0/0/5 -50 ℃ 0/5/0 1/3/0 0/5/0 4/0/0 - 0/0/5 0/5/0 0/0/5 - volume
resistance Ω cm 6.5e13 3.2e13 1.0e14 2.3e14 1.1e14 1.0e13 1.1e14 1.7e14 5.1e13 Oxygen
Indices % 27 27.5 27.5 27.5 27.5 28 25.5 28.5 28

As shown in Table 2, in the insulating specimen according to Comparative Example 1, the ethylene content of the ethylene propylene diene rubber in the base resin was excessive, and the crystallinity of the base resin was increased.

In addition, the insulating specimen according to the comparative example 2 exhibited deterioration in tensile strength, oil resistance, cold resistance and the like of the insulating specimen due to weak compatibility with the base resin using a flame retardant that was not surface-treated with a hydrophobic property. .

The insulating specimen according to Comparative Example 3 had an insufficient flame retardant content and a low oxygen index, and the flame retardancy was below the standard.

Furthermore, the insulating specimen according to Comparative Example 4 had a high oxygen index and an excessive flame retardant content, but the mechanical properties of the insulating composition, particularly the tensile strength at room temperature, were greatly reduced.

In addition, in the insulating specimen according to Comparative Example 5, the plasticizer was not used and the elongation percentage was lowered and the cold resistance was significantly lowered.

On the other hand, the insulating specimens of Examples 1 to 4 according to the present invention were both satisfactory in terms of cold resistance and oil resistance that were in conflict with each other, and were also excellent in flame retardancy, mechanical properties, and insulation characteristics.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10: conductor 20: insulating layer

Claims (12)

As the insulating composition,
An ethylene vinyl acetate resin and an ethylene propylene diene rubber resin as a base resin,
The insulation layer formed from the insulation composition had a tensile strength of 30% or more after cooling at -50 캜 for 4 hours, and a tensile strength and an elongation percentage of 60 after immersing in IRM 903 oil at 70 캜 for 168 hours. ≪ / RTI > to 140%. The method according to claim 1,
Wherein the ethylene vinyl acetate resin comprises an ethylene vinyl acetate resin having a vinyl acetate monomer content of at least 50 wt% and an ethylene vinyl acetate resin grafted with maleic anhydride. 3. The method of claim 2,
Wherein the content of the ethylene vinyl acetate resin is 40 to 60 parts by weight based on 100 parts by weight of the base resin, the content of the ethylene vinyl acetate resin having the maleic anhydride grafted is 10 To 20 parts by weight, and the content of the ethylene propylene diene rubber resin is 30 to 50 parts by weight. 4. The method according to any one of claims 1 to 3,
Wherein the ethylene propylene diene rubber resin has a Mooney viscosity of 20 to 30. 5. The method of claim 4,
Wherein the ethylene propylene diene rubber resin has an ethylene monomer content of 60% by weight or less based on the total weight thereof. 4. The method according to any one of claims 1 to 3,
And 100 to 150 parts by weight of a non-halogen flame retardant based on 100 parts by weight of the base resin. The method according to claim 6,
Wherein the non-halogen flame retardant comprises magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ), or both. 8. The method of claim 7,
Wherein the magnesium hydroxide (Mg (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ) or both are surface modified by alkylsilane, vinylsilane, stearic acid, oleic acid or aminopolysiloxane, Mu m. ≪ / RTI > 4. The method according to any one of claims 1 to 3,
Based on 100 parts by weight of the base resin, di-2-ethylhexyl adipate (DOA), di-2-ethylhexyl sebacate (DOS), di-2-ethylhexyl azelate And 5 to 20 parts by weight of at least one plasticizer selected from the group consisting of tetraethylorthosilicate (DOZ) and trioctyl trimellitate (TOTM). 4. The method according to any one of claims 1 to 3,
Further comprising 2 to 6 parts by weight of an organic peroxide crosslinking agent based on 100 parts by weight of the base resin. 4. The method according to any one of claims 1 to 3,
A flame retardant additive, a crosslinking aid, an antioxidant, a processing aid, or a combination thereof. Conductor; And
An insulating layer formed from the insulating composition of any one of claims 1 to 3 surrounding the conductor.

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