KR20180040489A - Fluororesin composition with excellent heat-resistance, and cable having a dielectric layer made from the same - Google Patents

Abstract

The present invention relates to a fluororesin composition with excellent heat resistance and a cable having an insulation layer formed therefrom. In particular, the present invention relates to the fluororesin composition which has excellent heat resistance and chemical resistance, and an excellent flexibility with an excellent corrosion resistance tradeoff with the flexibility at the same time while cold resistance, a pinch feature, an extrusion property, and the like are additionally improved and production costs thereof can be reduced. Thus, the fluororesin composition can be used as an insulation layer material of a high temperature resistance wire.

Description

A cable comprising a fluororesin composition having excellent heat resistance and an insulating layer formed therefrom (Fluororesin composition with excellent heat-resistance, and having a dielectric layer made from the same)

The present invention relates to a fluororesin composition having excellent heat resistance and a cable including an insulating layer formed therefrom. More particularly, the present invention relates to a resin composition which is excellent in heat resistance and chemical resistance, is excellent in flexibility and abrasion resistance in a trade-off relation thereto, and is excellent in cold resistance, pinch characteristics, To a cable including a fluororesin composition and an insulating layer formed therefrom which can be further improved and manufacturing cost can be reduced.

The electric wire for the fuel pump of the automobile and the tube for the defense can be made of the high heat-resistant material since the continuous use temperature is high.

1 schematically shows a cross section of a T5-class high heat-resistant wire which can be used as the electric wire for a fuel pump for an automobile. As shown in FIG. 1, the T5-level high heat resistance wire may be composed of the conductor 10 and the insulating layer 20 of a high heat-resistant material surrounding the conductor 10. The insulating material forming the insulating layer 20 may have high heat resistance Is required.

Particularly, when the T5 grade high heat resistance wire is used as a high heat resistance wire for automobiles, the insulation material forming the insulation layer 20 satisfies the heat resistance and chemical resistance based on the TISS / TOSS specification of the specification ARX-9 and GMW The specimens shall be subjected to a heat resistance test for one week in a convection oven maintained at 210 ° C and 1.0 ° C to satisfy the specified values of tensile strength and elongation of 80% or more and elongation percentage of 50% or more. , And chemical test is carried out in a convection oven at 150 ° C in 1,000 hours in a state immersed in auto trasmission oil, so that the rate of change in outer diameter should not exceed 20%.

The insulating material forming the insulating layer 20 was heated in an oven at 210 캜 for one week in the state of electric wires surrounding the conductor, and subjected to withstand voltage evaluation after bending, heating in an oven at 225 캜 for one hour, It is necessary to satisfy both of the withstand voltage evaluation and other specifications such as flexibility, pinch characteristics, cold resistance and flame retardancy.

Polyethylene, polypropylene, and polyvinyl chloride, which are conventionally used as an insulating layer material for conventional wires, are insufficient in heat resistance and chemical resistance to be applied to a material for an insulating layer of a high heat-resistant wire. In use, fluorine resin is used.

The fluororesin exhibits excellent high heat resistance and chemical resistance. However, since the fluororesin has a high melting temperature, it is hard to process and has a high hardness, resulting in poor flexibility, which may make wiring work difficult when applied to wires or tubes.

In order to improve the processability of the fluorine resin, a fluorine copolymer or a terpolymer to which a monomer capable of lowering the melting temperature is applied can be used. Korean Patent Laid-Open Publication No. 2016-0022037 discloses a fluorine- A fluoropolymer or a terpolymer is mixed. However, such a composition is insufficient in at least one of heat resistance, chemical resistance, flexibility, cold resistance and flame retardancy and can increase the production cost of the composition.

Further, when a large amount of a plasticizer or the like is applied to improve the flexibility of the fluororesin, the flexibility is improved to some extent, but the abrasion resistance and the pinch characteristics are greatly deteriorated.

Accordingly, it is possible to provide a resin composition which is excellent in heat resistance, chemical resistance, and abrasion resistance which are compatible with each other and can be applied to an insulating layer of a high heat-resistant wire, and also can be improved in flexibility, cold resistance, pinch characteristics, extrudability, A fluororesin composition is desperately required.

An object of the present invention is to provide a fluororesin composition which is excellent in heat resistance, chemical resistance and processability, and is excellent in both flexibility and inferior abrasion resistance and pinch characteristics.

Another object of the present invention is to provide a fluororesin composition which is further improved in cold resistance, extrusion properties, and the like, which is required for use as an insulating layer of high heat resistance wires for automobiles.

Further, it is an object of the present invention to provide a cable having an insulating layer formed from the fluororesin composition.

In order to solve the above problems,

A fluororesin composition comprising a base resin comprising a fluororesin having a melting point of 100 to 170 占 폚 and a synthetic rubber comprising a fluorine rubber having a Mooney viscosity (ML1 + 10 (121 占 폚)) of 40 to 80 and a polar monomer, The content of the polar monomer is 50 to 80% by weight based on the total weight of the synthetic rubber containing the polar monomer. The content of the fluororesin (A), the content of the fluororubber (B) and the polar monomer Wherein the content (C) of the synthetic rubber satisfies the relationship of A? B + C and B> C.

Here, the synthetic rubber including the polar monomer has a Mooney viscosity (ML1 + 10 (121 DEG C)) of 24 to 32. [

Further, the fluorine rubber has a number average molecular weight (Mn) of 90,000 to 120,000.

The content (C) of the synthetic rubber containing the polar monomer is 5 to 15 parts by weight based on 100 parts by weight of the base resin.

Wherein the content (A) of the fluororesin is 50 to 70 parts by weight and the content (B) of the fluororubber is 25 to 45 parts by weight based on 100 parts by weight of the base resin. to provide.

The present invention also provides a fluororesin composition, wherein the fluororesin comprises polyvinylidene fluoride (PVDF).

Further, the fluorine rubber is characterized in that it comprises a binary system (VDF + HFP) fluorine rubber of vinylidene fluoride (VDF) and hexafluoropropylene (HFP).

And, the synthetic rubber containing the polar monomer includes ethylene vinyl acetate rubber (EVM).

Further, the fluorine rubber has a fluorine content (F contents) of 60 to 75% by weight.

Further, the fluororesin composition is further characterized by comprising a filler.

Here, the content of the filler is 3 to 10 parts by weight based on 100 parts by weight of the base resin.

On the other hand, the filler comprises at least one selected from the group consisting of talc, calcium carbonate, silica and clay.

Wherein the filler comprises a filler comprising a mixture of silica and kaolinite and coated with vinylsilane.

Further, the present invention provides a fluororesin composition, which further comprises at least one additive selected from the group consisting of an antioxidant, a lubricant, a stabilizer, a plasticizer, a crosslinking agent and a crosslinking assistant.

Also, the antioxidant includes a phenol-based antioxidant having a melting point of 100 to 120 ° C and a molecular weight of 1,000 to 1,200.

The present invention also provides a fluororesin composition, wherein the lubricant comprises a fluorine-containing lubricant.

Further, the stabilizer comprises a calcium hydroxide having an average particle diameter of 4.5 to 7.5 mu m and a specific surface area of 20 m < 2 > / g or less.

Meanwhile, a fluorine resin composition having a 5% secant modulus of 8 to 12 kgf / mm < 2 > of the specimen prepared from the fluororesin composition is provided.

Further, a conductor having a nominal cross-sectional area of 0.5 mm 2 and a cable specimen having an insulating layer formed on the surface of the conductor by extrusion of the fluorine resin composition were subjected to friction with sandpaper under a load of 450 g according to the standard ARX-9 Wherein the movement distance of the cable specimen until the exposed aluminum conductor and the aluminum tape disposed on the sandpaper are electrically energized when the insulating layer is moved while moving is 470 to 550 mm.

When a pressure is applied to the surface of the insulating layer of the cable specimen having the insulating layer formed on the surface of the conductor by extrusion of the fluorine resin composition according to the standard ARX-9, the pressed insulating layer is torn, And a pressure applied to a surface of the insulating layer when energization between the metal rods occurs is 2.8 to 3.6 kgf / mm < 2 >.

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

The fluororesin composition according to the present invention is improved in flexibility and extrudability as well as in heat resistance and chemical resistance by mixing a fluororesin having a controlled melting point as a base resin and a synthetic rubber containing a fluorine rubber and a polar monomer, And exhibits excellent effects in that the abrasion resistance and pinch characteristics in the relationship are both improved.

In particular, the fluororesin composition according to the present invention can further improve the flexibility, cold resistance, processability and extrudability of the fluororesin composition by using a synthetic rubber containing a polar monomer together with the fluororubber, It is possible to reduce the manufacturing cost of the fluororesin composition because the unit cost is low and the composition of the composition is improved and the filler loading property is further improved to avoid or minimize the deterioration of the heat resistance and chemical resistance of the fluororesin composition by the addition of the filler .

1 schematically shows a cross section of a T5-grade high heat-resistant wire.

Hereinafter, preferred embodiments of the present invention will be described in detail. 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.

The fluororesin composition according to the present invention includes a synthetic rubber containing a polar monomer in addition to a fluororesin and a fluororubber as a base resin.

The fluororesin may comprise a homopolymerized fluororesin or a block or random copolymer fluororesin and is not particularly limited as long as it has a melting point of 100 to 170 ° C. If the melting point of the fluororesin exceeds 170 캜, the melting temperature may be too high to significantly lower the workability of the fluororesin composition, while if it is lower than 100 캜, the heat resistance of the fluororesin composition may be significantly lowered.

The fluororesin may include, for example, polyvinylidene fluoride (PVDF), vinylidene fluoride (VDF), hexafluoropropylene (HFP), tetrafluoroethylene (TFE) And at least one monomer selected from the group consisting of chlorotetrafluoroethylene (CTFE), perfluoromethyl vinyl ether (PMVE), and the like, preferably polyvinylidene fluoride Or polyvinyldenefluoride (PVDF).

The fluororesin is excellent in heat resistance and chemical resistance, and also has high electrical insulation. The flexibility of the fluororesin composition containing the fluororesin can be evaluated as a 5% secant modulus of the specimen prepared therefrom of 8 to 12 kgf / mm < 2 >. When the 5% secant modulus of the specimen prepared from the fluororesin composition is less than 8 kgf / mm 2, the abrasion resistance and the pinch characteristics of the fluororesin composition are below specifications, while when the fluororesin composition has a flexural modulus exceeding 12 kgf / It may be undersized.

The fluororubber, which is one kind of two kinds of rubber components included in the base resin, can improve the flexibility, cold resistance, extrudability, and the like of the fluororesin composition. For example, the fluororubber can be produced by mixing vinylidene fluoride (VDF) and hexafluoro (VDF + HFP) fluororubber of propylene (HFP) or a mixture of vinylidene fluoride (VDF), hexafluoropropylene (HFP) and tetrafluoroethylene (TFE) or vinylidene fluoride (VDF), tetrafluoro (VDF + HFP + TFE) fluorine rubber of ethylene (TFE) and perfluoromethyl vinyl ether (PMVE).

The fluorine rubber may have a number average molecular weight (Mn) of 90,000 to 120,000 and a Mooney viscosity (ML1 + 10 (121 ° C)) of 40 to 80. A number average molecular weight (Mn) of less than 90,000 or a Mooney viscosity (121 DEG C)) is less than 40, the heat resistance of the fluororesin composition may be insufficient, whereas when the number average molecular weight (Mn) exceeds 120,000 or the Mooney viscosity (ML1 + 10 (121 DEG C) The flexibility, cold resistance, extrudability and the like of the thermoplastic resin can be lowered.

In particular, the fluorine rubber may have a fluorine content (F contents) of preferably 60 to 75% by weight, more preferably 66 to 70% by weight based on the total weight thereof. If the fluorine content is less than 60% by weight, the heat resistance of the fluororesin composition may be insufficient or the compatibility with the fluororesin may be deteriorated. If the fluororesin content exceeds 70% by weight, the flexibility, cold resistance, .

The synthetic rubber comprising a polar monomer, which is one of the two rubber components included in the base resin, further improves the flexibility, cold resistance, extrudability and the like of the fluororesin composition and has a relatively lower unit price than the fluororesin It is possible to reduce the manufacturing cost of the fluororesin composition and to further improve the filler loading property so as to avoid or minimize the deterioration of the heat resistance and the chemical resistance of the fluororesin by the addition of the additive. For example, ethylene vinyl acetate rubber EVM, acrylic rubber (ACM), ethylene-acrylic rubber (AEM), and the like.

When the Mooney viscosity (ML1 + 10 (121 deg. C)) of the synthetic rubber containing the polar monomer is in the range of 24 to 32 and the Mooney viscosity (ML1 + 10 On the other hand, if it exceeds 32, the flexibility of the fluororesin composition may be insufficient.

In particular, the content of the polar monomer such as an acrylic monomer, a vinyl acetate monomer and the like may be 50 to 80% by weight based on the total weight of the synthetic rubber containing the polar monomer. If the content of the polar monomer is less than 50% by weight, improvement in flexibility, workability and extrudability of the fluororesin composition may be insignificant. On the other hand, if the content of the polar monomer exceeds 80% by weight, abrasion resistance and pinch properties of the fluororesin composition .

Here, the relationship between the content (A) of the fluororesin, the content (B) of the fluorine rubber, and the content (C) of the synthetic rubber containing the polar monomer is such that A? B + C and B> C are simultaneously satisfied . When A < B + C, abrasion resistance and pinch characteristics may be deteriorated. When B &amp;le; C, the heat resistance and chemical resistance of the fluororesin composition may be significantly lowered.

In this regard, the content of the fluororesin is 50 to 70 parts by weight, the content of the fluororubber is 25 to 45 parts by weight, and the content of the synthetic rubber containing the polar monomer is 5 To 15 parts by weight.

If the content of the fluorine rubber is less than 25 parts by weight and the content of the fluorine resin is more than 70 parts by weight, the flexibility, cold resistance, extrudability and the like of the fluorine resin composition may be lowered. If the content of the fluorine rubber is less than 25 parts by weight And the content of the synthetic rubber containing the polar monomer is more than 15 parts by weight, wear resistance and pinch characteristics of the fluororesin composition may be lowered.

On the other hand, when the content of the fluorine rubber is more than 45 parts by weight and the content of the fluorine resin is less than 50 parts by weight, the heat resistance and chemical resistance of the fluorine resin composition may be lowered. When the content of the fluorine rubber is more than 45 parts by weight If the content of the synthetic rubber containing the polar monomer is less than 5 parts by weight, the production cost of the fluororesin composition may be unnecessarily increased.

As described above, the fluororesin composition according to the present invention contains a fluororesin whose melting point is controlled as a base resin, a synthetic rubber containing a fluorine rubber and a polar monomer at a specific blending ratio, and thus has flexibility and a trade- All of the characteristics can be improved, and the manufacturing cost can be reduced.

In particular, the fluororesin composition according to the present invention has a conductor having a nominal cross-sectional area of 0.5 mm 2 in relation to its abrasion resistance and a cable specimen having an insulation layer formed on the surface of the conductor by extrusion of the fluororesin composition according to the standard ARX-9, The moving distance of the cable specimen until the exposed aluminum conductor is exposed to wear and the aluminum tape disposed on the sandpaper is energized is in a range of 470 to 550 mm , With respect to the pinch characteristic, a conductor having a nominal cross-sectional area of 0.5 mm 2 and a conductor specimen having an insulation layer formed on the conductor surface by extrusion of the fluorine resin composition, When the pressure is applied, the pressed insulation layer is torn to cause the insulation when the energization between the exposed conductor and the metal rod occurs The pressure applied to the surface may be 2.8 to 3.6 kgf / ㎟.

Here, when the moving distance of the cable specimen is less than 470 mm in relation to the abrasion resistance, the abrasion resistance of the fluororesin composition is below the standard, while when it is more than 550 mm, the flexibility and cold resistance of the fluororesin composition may be significantly lowered . When the pressure is less than 2.8 kgf / mm &lt; 2 &gt; in relation to the pinch characteristics, the pinch characteristics of the fluororesin composition are below the standard, while when the pressure exceeds 3.6 kgf / mm &lt; 2 &gt;, the flexibility and cold resistance of the fluororesin composition .

The fluororesin composition according to the present invention may further comprise a filler.

The filler may comprise, for example, talc, calcium carbonate, silica, clay or the like, preferably a filler comprising a mixture of silica and kaolinite and coated with vinylsilane Such a filler may further have a function of raising the coefficient of friction of the composition to improve the processability of the fluororesin composition. The content of the filler may be 3 to 10 parts by weight based on 100 parts by weight of the base resin.

The fluororesin composition according to the present invention may further optionally include additives such as an antioxidant, a lubricant, a stabilizer, a plasticizer, a crosslinking agent, and a crosslinking assistant.

The antioxidant may function to prevent the deterioration of the synthetic rubber containing the polar monomer having a relatively low heat resistance and preferably has a melting point of 100 to 120 ° C and a molecular weight of 1,000 to 1,200, And the content of the antioxidant may be 0.5 to 1.5 parts by weight based on 100 parts by weight of the base resin.

The lubricant acts to maintain the physical properties of the fluororesin composition after heating, in particular, the elongation percentage, and a conventional lubricant such as polyethylene wax can be annihilated upon heating. Therefore, the lubricant has excellent heat resistance and maintains the elongation percentage of the fluororesin composition For example, a fluorinated olefin-based lubricant. The content of the lubricant may be 0.3 to 1 part by weight based on 100 parts by weight of the base resin.

The stabilizer may include, for example, calcium hydroxide, aluminum oxide, magnesium oxide and the like, preferably calcium hydroxide having an average particle diameter of 4.5 to 7.5 mu m and a specific surface area of 20 m &lt; 2 &gt; / g or less. The content of the stabilizer may be 3 to 8 parts by weight based on 100 parts by weight of the base resin.

The plasticizer may be added to further improve the cold resistance and extrudability of the fluororesin composition. For example, phthalate ester, aliphatic dibasic acid ester, polyester, epoxy plasticizer and the like may be used. 1 to 4 parts by weight based on 100 parts by weight of the base resin may be added.

The crosslinking agent can improve physical properties at room temperature, particularly tensile strength and heat resistance of the fluororesin composition through chemical crosslinking of the fluororesin. For example, the crosslinking agent may be an amine-based, silane-based, polyol-based or peroxide- And may be added in an amount of 1 to 3 parts by weight based on 100 parts by weight of the base resin.

The crosslinking aid can improve physical properties at room temperature, particularly tensile strength and heat resistance, of the fluororesin composition through the irradiation agent of the fluororesin. It is also possible to use triallyl isocyanurate (TAIC), triallyl cyanurate (TAC) Trimethylolpropane trimethacrylate (TMPTMA), trimethylolpropane triacrylate (TMPTA), and the like, and may be added in an amount of 1 to 5 parts by weight based on 100 parts by weight of the base resin.

The present invention relates to a cable including an insulation layer formed by the fluororesin composition as a conductor and an insulation layer surrounding the conductor.

[Example]

1. Manufacturing Example

The fluororesin composition specimens and the cable specimens according to the examples and comparative examples were prepared with the constituents and contents shown in Table 1 below. The fluororesin composition specimen was manufactured by kneading at 155 ° C for 30 minutes using a 3 L kneader. The cable specimen was manufactured to have an outer diameter of 1.72 mm by using a conductor having a nominal cross-sectional area of 0.5 mm 2 through a wire extruder. The unit of the content shown in Table 1 below is parts by weight.

Example Comparative Example One 2 3 One 2 3 4 5 6 7 Resin 1 58 55 58 90 60 60 55 58 60 Resin 2 60 Resin 3 32 30 35 36 30 25 32 30 Resin 4 6 30 Resin 5 10 10 10 10 10 20 10 10 Resin 6 10 Additive 1 8 8 8 8 8 15 5 Additive 2 4 4 6 6 4 4 4 4 6 Additive 3 0.5 0.5 0.7 0.6 0.6 0.5 0.5 0.5 0.5 Additive 4 1.0 Additive 5 3 3 3 4.5 3 3 3 3 3 3

- Resin 1: PVDF resin having a melting point of 140 to 145 캜

- Resin 2: PVDF resin having a melting point of 117 to 125 DEG C

- Resin 3: Fluorocarbon rubber (VdF + HFP) having a Mooney viscosity of 50 to 60

- Resin 4: Fluorocarbon rubber (VdF + HFP) having a Mooney viscosity of 110 to 120

Resin 5: Ethylene vinyl acetate rubber having a vinyl acetate content of 70% by weight

Resin 6: an ethylene vinyl acetate rubber having a vinyl acetate content of 45% by weight

- Additive 1: Silica coated with vinylsilane

Additive 2: Carnauba coated calcium hydroxide

- Additive 3: Fluorine-based lubricant

- Additive 4: polyethylene wax

- Additive 5: dioctyl sebacate plasticizer

2. Property evaluation

1) Room temperature properties (tensile strength, elongation and flexibility)

The tensile strength, elongation and flexibility of each of the fluorine resin composition specimens of the examples and comparative examples were measured according to ARX-9 standards. The tensile strength was 1.05 kgf / mm 2 or more, the elongation was 150% or more and the flexibility was 5% Modulus.

2) Properties after heating (tensile strength and elongation)

According to the ARX-9 standard, the fluorine resin composition specimens of each of the examples and comparative examples were subjected to a heating test in a convection oven at 210 캜 for 168 hours, and tensile strength and elongation were measured. The tensile strength retention ratio was 80% %.

3) Cold resistance evaluation

According to the ARX-9 and ISO 6722 standards, the wire specimens of each of the examples and comparative examples were wound in a mandrel of 5 magnets in a convection oven at -40 캜, followed by a cold resistance test for about 4 hours with a weight of 5 kg alone. There should be no cracks by making two revolutions at the speed of 1 time per second.

4) Abrasion resistance evaluation

According to the ARX-9 standard, each wire specimen of Examples and Comparative Examples should not be energized for at least 457 mm in length while rubbing against a sandpaper under a load of 450 g.

5) Evaluation of pinch characteristics

According to the ARX-9 standard, when the insulation surface of each wire specimen of each of the examples and comparative examples is pressurized, the pressure to be energized should be at least 2.7 kgf / ㎟.

6) Extrusion evaluation

(⊚), good (◯), and poor (×), excellent extrudability (⊚), good (◯), and excellent ), And defective (x), respectively.

The physical property evaluation results are shown in Table 2 below.

spec. Example Comparative Example One 2 3 One 2 3 4 5 6 7

Prize
On 5% Secant Modulus
(kgf / mm2) 12 ↓ 10.
987 9.
691 10.
511 15.
27 18.
666 9.
647 16.
422 9.
721 The tensile strength
(kgf / mm2) 1.05 ↑ 1.907 1.506 1.750 1.782 1.637 1.848 2.248 1.176 Elongation (%) 150 ↑ 384.4 345.6 488.4 387.2 347.7 408.5 321.5 228.6
end
Ten The tensile strength
Remaining rate (%) 80 ↑ 96 107 97 106 95 82 82 197 Elongation rate
Remaining rate (%) 50 ↑ 74 84 92 92 70 38 58 2 Cold resistance Pass Pass Pass Pass Pass Fail Pass Pass Abrasion resistance (mm) 457 ↑ 503 544 487 912 Pinch characteristics
(kgf / mm2) 2.7 ↑ 3.35 3.56 3.68 5.42 3.17 4.10 end
ball
castle Fold composition ◎ ◎ ◎ × ◎ ○ ○ ◎ ○ ○ Extrudability ◎ ◎ ◎ ◎ ◎ ○ × ◎ × ×

As shown in Table 2, the fluororesin composition of Comparative Example 1 contained a fluorine rubber having a too high Mooney viscosity instead of a synthetic rubber containing a polar monomer, The fluoropolymer composition of Comparative Examples 3 and 5 was inferior in polar monomer content of the synthetic rubber or synthetic rubber other than fluorocarbon rubber because the content of the fluoropolymer resin was excessive, And the extensibility after heating was greatly lowered. In the fluororesin composition of Comparative Example 4, the flexibility and the extrudability were greatly reduced by applying fluororubber having an excessively high Mooney viscosity, and the fluororesin compositions of Comparative Examples 6 and 7 The use of a general lubricant rather than a fluorine-containing lubricant or an excessive addition of a filler significantly degraded the extrudability It was in.

On the other hand, it was confirmed that the fluororesin compositions of Examples 1 to 3 according to the present invention are harmoniously excellent in mechanical properties, heat resistance, flexibility, cold resistance, abrasion resistance, pinch characteristics, and extrudability.

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 (21)

As the fluororesin composition,
A base resin comprising a fluororesin having a melting point of 100 to 170 占 폚 and a synthetic rubber comprising a fluorine rubber having a Mooney viscosity (ML1 + 10 (121 占 폚)) of 40 to 80 and a polar monomer,
The content of the polar monomer is 50 to 80% by weight based on the total weight of the synthetic rubber containing the polar monomer,
, The content (A) of the fluororesin, the content (B) of the fluorine rubber and the content (C) of the synthetic rubber containing the polar monomer satisfy the relation of A? B + C and B> C , A fluororesin composition. The method according to claim 1,
Wherein a Mooney viscosity (ML1 + 10 (121 占 폚)) of the synthetic rubber containing the polar monomer is 24 to 32. The fluorine- The method according to claim 1,
Wherein the fluorine rubber has a number average molecular weight (Mn) of 90,000 to 120,000. 3. The method of claim 2,
Wherein the content (C) of the synthetic rubber containing the polar monomer is 5 to 15 parts by weight based on 100 parts by weight of the base resin. 5. The method of claim 4,
Wherein the content (A) of the fluororesin is 50 to 70 parts by weight and the content (B) of the fluororubber is 25 to 45 parts by weight based on 100 parts by weight of the base resin. 6. The method according to any one of claims 1 to 5,
Wherein the fluororesin comprises polyvinylidene fluoride (PVDF). 6. The method according to any one of claims 1 to 5,
Wherein the fluorine rubber comprises a binary system (VDF + HFP) fluororubber of vinylidene fluoride (VDF) having a number average molecular weight (Mn) of 90,000 to 120,000 and hexafluoropropylene (HFP) . 6. The method according to any one of claims 1 to 5,
Wherein the synthetic rubber comprising the polar monomer comprises ethylene vinyl acetate rubber (EVM). 6. The method according to any one of claims 1 to 5,
Wherein the fluororubber has a fluorine content (F contents) of 60 to 75% by weight. 6. The method according to any one of claims 1 to 5,
Wherein the fluororesin composition further comprises a filler. 11. The method of claim 10,
Wherein the content of the filler is 3 to 10 parts by weight based on 100 parts by weight of the base resin. 11. The method of claim 10,
Wherein the filler comprises at least one selected from the group consisting of talc, calcium carbonate, silica and clay. 13. The method of claim 12,
Characterized in that the filler comprises a filler comprising a mixture of silica and kaolinite and coated with vinylsilane. 6. The method according to any one of claims 1 to 5,
Wherein the fluororesin composition further comprises at least one additive selected from the group consisting of an antioxidant, a lubricant, a stabilizer, a plasticizer, a crosslinking agent, and a crosslinking assistant. 15. The method of claim 14,
Wherein the antioxidant comprises a phenol-based antioxidant having a melting point of 100 to 120 DEG C and a molecular weight of 1,000 to 1,200. 15. The method of claim 14,
Wherein the lubricant comprises a fluorine-containing lubricant. 15. The method of claim 14,
Wherein the stabilizer comprises calcium hydroxide having an average particle diameter of 4.5 to 7.5 mu m and a specific surface area of 20 m &lt; 2 &gt; / g or less. 6. The method according to any one of claims 1 to 5,
Wherein a 5% secant modulus of the specimen prepared from the fluororesin composition is 8 to 12 kgf / mm &lt; 2 &gt;. 6. The method according to any one of claims 1 to 5,
A conductor having a nominal cross-sectional area of 0.5 mm 2 and a cable specimen having an insulation layer formed on the surface of the conductor by extrusion of the fluorine resin composition move in friction with a sandpaper under a load of 450 g according to the standard ARX-9 Wherein the movement distance of the cable specimen until the exposed aluminum conductor and the aluminum tape disposed on the sandpaper are energized when the insulating layer is worn out is 470 to 550 mm. 6. The method according to any one of claims 1 to 5,
When a pressure is applied to the surface of the insulating layer of the cable specimen having the insulating layer formed on the surface of the conductor by extrusion of the fluororesin composition according to the standard ARX-9, the pressed insulating layer is torn, And the pressure applied to the surface of the insulating layer when energization between the rods occurs is 2.8 to 3.6 kgf / mm &lt; 2 &gt;. Conductor; And
A cable comprising an insulation layer formed from the fluororesin composition according to any one of claims 1 to 5 to wrap the conductor.

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