KR20020092503A - Rubber Composition for Coating Steel Cord Having Improved Modulus - Google Patents

Rubber Composition for Coating Steel Cord Having Improved Modulus Download PDF

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KR20020092503A
KR20020092503A KR1020010031151A KR20010031151A KR20020092503A KR 20020092503 A KR20020092503 A KR 20020092503A KR 1020010031151 A KR1020010031151 A KR 1020010031151A KR 20010031151 A KR20010031151 A KR 20010031151A KR 20020092503 A KR20020092503 A KR 20020092503A
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rubber
steel cord
rubber composition
coating
formula
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KR1020010031151A
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Korean (ko)
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KR100437321B1 (en
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임성수
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한국타이어 주식회사
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Priority to KR10-2001-0031151A priority Critical patent/KR100437321B1/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0041—Compositions of the carcass layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/02—Carcasses
    • B60C9/16—Carcasses built-up with metallic reinforcing inlays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/092—Polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Tires In General (AREA)

Abstract

PURPOSE: A rubber composition for coating a steel cord is provided, to improve the modulus, the heat resistance and the fatigue resistance of the steel cord by using an ionomer instead of increasing the content of sulfur or carbon black. CONSTITUTION: The rubber composition comprises 100 parts by weight of a natural rubber or a rubber mixture of a natural rubber and a synthetic isoprene rubber; 1-60 parts by weight of the ionomer represented by the formula 1; and at least one additive selected from the group consisting of a reinforcement, a curing agent, a curing activator, a softening agent, a processing promoter, a curing accelerator, and an antiaging agent, wherein R is H or CH3, and M is a metal ion. Preferably the M is selected from the group consisting of Ma2+, Ba2+, Zn2+ and Al3+. More preferably R is CH3 and M is Mg2+; or R is H and M is Mg2+.

Description

모듈러스가 향상된 스틸코드 코팅용 고무조성물{Rubber Composition for Coating Steel Cord Having Improved Modulus}Rubber Composition for Coating Steel Cord Having Improved Modulus

본 발명은 모듈러스가 향상된 스틸코드 코팅용 고무조성물에 관한 것으로, 더욱 상세하게는 통상의 스틸코드 코팅용 고무조성물에 이오노머(ionomer)가 첨가됨으로써 모듈러스(modulus)가 향상된 스틸코드 코팅용 고무조성물에 관한 것이다.The present invention relates to a rubber composition for coating steel cord with improved modulus, and more particularly to a rubber composition for coating steel cord with improved modulus by adding ionomer to rubber composition for coating steel cord. will be.

일반적으로 래디알 타이어(radial tire)는 차량 주행중 벨트(belt)가 강한 응력을 받음과 동시에 심한 변형을 일으키게 된다.In general, a radial tire causes severe deformation while a belt is strongly stressed while driving a vehicle.

여기서 벨트는 일정각도를 가지는 2장 내지 4장의 황동이 피복된 스틸코드(brass coated steel cord)와, 이 스틸코드를 상하에서 샌드위치식으로 코팅하고 있는 고무 즉, 스틸코드 코팅용 고무로 이루어진다.Here, the belt is made of two to four brass coated steel cord (brass coated steel cord) having a certain angle, and the rubber coated on the steel cord in the sandwich form, that is, steel cord coating rubber.

차량 주행에 의한 벨트의 변형과 응력의 변화가 장기간 계속되면 스틸코드와 스틸코드 코팅용 고무 사이에 균열이 발생하게 되고, 균열이 발생한 상태에서는 위와 같은 변형과 응력의 집중이 계속되면 균열은 점점 성장해 결국은 파괴에 이르게 되고 타이어의 안정성에 심각한 문제를 유발하게 된다.If the belt is deformed and the stress is changed for a long time, the crack occurs between the steel cord and the rubber for coating the steel cord.In the cracked state, the crack grows as the strain and stress concentration continue. Eventually it will lead to destruction and cause serious problems with the stability of the tires.

따라서 상기 문제점을 해결하기 위해서 스틸코드 코팅용 고무의 모듈러스를높임으로써 타이어 내에서 스틸코드의 움직임을 최소화시켜 스틸코드와 스틸코드 코팅용 고무간의 균열이 감소되도록 해야 한다.Therefore, in order to solve the above problems, by increasing the modulus of the rubber for coating the steel cord to minimize the movement of the steel cord in the tire to reduce the crack between the steel cord and the rubber for coating the steel cord.

이를 위해 종래에는 첫째, 통상의 스틸코드 코팅용 고무조성물에 있어서 가황제인 유황의 사용량을 증가시켰으나, 유황의 과도한 사용은 고무의 내열성 및 내피로성을 저하시키고 고무의 파단(破斷) 에너지를 떨어뜨릴 뿐만 아니라 가공중에는 유황의 석출에 의해 고무의 점착성을 저하시키게 되는 문제점이 있었다.To this end, first, the amount of sulfur, which is a vulcanizing agent, has been increased in conventional rubber cord coating rubber compositions, but excessive use of sulfur may lower the heat resistance and fatigue resistance of rubber and lower the breaking energy of rubber. In addition, during processing, there was a problem that the adhesion of the rubber is reduced by the precipitation of sulfur.

둘째, 통상의 스틸코드 코팅용 고무조성물에 있어서 보강제인 카본블랙의 사용량을 증가시켰으나, 카본블랙의 과도한 사용은 차량 주행중 고무의 발열을 증가시켜 타이어의 내구성을 저하시킬 뿐만 아니라 가공중에는 높은 열을 발생시켜 고무의 점착성을 저하시키고 또한 물성을 저하시키게 되는 문제점이 있었다.Second, the use of carbon black, which is a reinforcing agent, is increased in the rubber composition for steel cord coating, but excessive use of carbon black increases the heat generation of rubber while driving the vehicle, which not only reduces tire durability but also generates high heat during processing. There is a problem in that the adhesiveness of the rubber is lowered and the physical properties are lowered.

셋째, 통상의 스틸코드 코팅용 고무조성물에 있어서 보강성 수지로 페놀계 수지 또는 에폭시계 수지를 사용하였으나, 가공시 높은 점도 상승을 유발하여 가공을 어렵게 하는 문제점이 있었다.Third, although a phenol-based resin or an epoxy-based resin was used as a reinforcing resin in the steel composition for coating a steel cord, there was a problem in that processing caused a high viscosity increase during processing.

이에 본 발명은 상기 종래의 문제점을 해결하기 위하여 통상의 스틸코드 코팅용 고무조성물에 있어서 유황이나 카본블랙의 사용량을 증가시키는 대신 이오노머를 첨가시킴으로써 모듈러스가 크게 향상된 스틸코드 코팅용 고무조성물을 제공하는 것을 목적으로 한다.Accordingly, the present invention is to provide a rubber composition for coating steel cord coating significantly improved modulus by adding an ionomer instead of increasing the amount of sulfur or carbon black in the conventional rubber cord coating rubber composition to solve the conventional problems. The purpose.

본 발명에서는 상기 목적을 달성하기 위해 통상의 스틸코드 코팅용 고무조성물에 이오노머(ionomer)를 첨가시킨 스틸코드 코팅용 고무조성물을 제공한다.The present invention provides a rubber composition for coating the steel cord in which an ionomer is added to a rubber composition for coating the steel cord in order to achieve the above object.

먼저, 상기 통상의 스틸코드 코팅용 고무조성물은 원료고무인 천연고무 또는 천연고무와 합성 이소프렌고무의 혼합물; 보강제인 카본블랙 또는 실리카; 가황제인 유황; 가류활성제인 산화아연; 및 그외의 연화제, 가공조제, 가황촉진제 또는 노화방지제와 같은 통상의 첨가제가 혼합된 것이다.First, the conventional steel cord coating rubber composition is a raw rubber or a mixture of natural rubber and synthetic isoprene rubber; Carbon black or silica as an adjuvant; Sulfur as a vulcanizing agent; Zinc oxide as a vulcanizing agent; And other additives such as softeners, processing aids, vulcanization accelerators or anti-aging agents.

다음, 본 발명의 스틸코드 코팅용 고무조성물에 첨가되는 이오노머에 대해 상세히 살펴보면 다음과 같다.Next, the ionomer added to the steel composition for coating a steel cord of the present invention will be described in detail.

이오노머란 카르복시기를 함유하는 에틸렌 공중합체의 주쇄간에 금속이온 결합이 도입된 것으로 하기 화학식 1로 표시된다.The ionomer is a metal ion bond introduced between the main chains of the ethylene copolymer containing a carboxyl group, and is represented by the following formula (1).

[화학식 1][Formula 1]

상기 식에서, R은 H 또는 CH3이고, M은 금속이온으로 Mg2+, Ba2+, Zn2+또는 Al3+등을 포함할 수 있다.In the above formula, R is H or CH 3 , M is a metal ion may include Mg 2+ , Ba 2+ , Zn 2+ or Al 3+ .

특히, 본 발명에서는 이오노머로서 바람직하게 하기 화학식 1a의 메타크릴산 마그네슘 또는 화학식 1b의 아크릴산 마그네슘이 사용된다.In particular, in the present invention, magnesium methacrylate of the formula (1a) or magnesium acrylate of the formula (1b) is preferably used as the ionomer.

[화학식 1a][Formula 1a]

[화학식 1b][Formula 1b]

상기 화학식 1로 표시되는 이오노머의 사용량은 스틸코드 코팅용 고무조성물에 있어서 원료고무인 천연고무 또는 천연고무와 합성 이소프렌고무의 혼합물 100 중량부에 대해 1 내지 60 중량부인 것이 바람직하다.The amount of the ionomer represented by Chemical Formula 1 is preferably 1 to 60 parts by weight based on 100 parts by weight of a natural rubber or a mixture of natural rubber and synthetic isoprene rubber, which are raw rubbers, in the rubber composition for coating a steel cord.

즉, 본 발명에 따른 모듈러스가 향상된 스틸코드 코팅용 고무조성물은 원료고무인 천연고무 또는 천연고무와 합성 이소프렌고무의 혼합물 100중량부에 이오노머인 상기 화학식 1의 화합물이 1 내지 60중량부가 혼합되고, 보강제인 카본블랙 또는 실리카, 가황제인 유황, 가류활성제인 산화아연 및 그외의 연화제, 가공조제, 가황촉진제 또는 노화방지제와 같은 통상의 첨가제들이 적정량 혼합된 것이다.That is, the rubber composition for coating the steel cord improved modulus according to the present invention is a compound of the formula (I) 1 to 60 parts by weight of the compound of formula 1 as ionomer 100 parts by weight of the natural rubber or a mixture of natural rubber and synthetic isoprene rubber as a raw material rubber Phosphorus carbon black or silica, sulfur as a vulcanizing agent, zinc oxide as a vulcanizing agent, and other conventional additives such as softening agents, processing aids, vulcanization accelerators or anti-aging agents are mixed in an appropriate amount.

상기 이오노머는 스틸코드 코팅용 고무조성물에 첨가되어 가교밀도를 높임으로써 모듈러스를 향상시키는데, 그 메카니즘은 다음과 같다.The ionomer is added to the rubber composition for coating the steel cord to improve the modulus by increasing the crosslinking density, the mechanism is as follows.

이오노머는 가교시 3가지 형태의 반응을 일으키는데, 첫째는 매트릭스 폴리머를 가교시키는 형태의 반응, 둘째는 이오노머끼리의 중합 반응, 셋째는 이오노머끼리의 응집체를 형성하는 반응을 일으킴으로써 나노-복합체 형태의 새로운 보강 효과를 발휘하게 되는 것이다.Ionomers give rise to three types of reactions when crosslinking: firstly, crosslinking of the matrix polymer, secondly polymerization of the ionomers, and thirdly forming the aggregates of the ionomers. It will exert a reinforcing effect.

또한 상기의 이오노머에 의해 형성된 가교 구조는 금속-카르복실기 결합에 의한 이온결합을 형성하기 때문에 뛰어난 열안정성을 나타내고 스트레스를 받았을 때 분자쇄를 따라서 미끄러지는 미끄러짐성(slip)이 뛰어난 장점을 가진다.In addition, since the crosslinked structure formed by the ionomer forms an ionic bond by a metal-carboxyl group bond, the crosslinked structure has excellent thermal stability and has an excellent slippage along the molecular chain when stressed.

즉, 상기 형태의 이온결합에 의한 가교는 뛰어난 열안정성과 함께 높은 인장강도와 인열강도를 나타내며, 내피로성에서도 우수한 특성을 나타낸다.That is, the crosslinking by the ionic bond of the above form shows high tensile strength and tearing strength with excellent thermal stability, and also shows excellent properties in fatigue resistance.

이하, 본 발명을 실시예에 의거하여 더욱 상세하게 설명하면 다음과 같다. 단, 본 발명이 하기의 실시예에 의해 국한되는 것은 아니다.Hereinafter, the present invention will be described in more detail based on Examples. However, this invention is not limited by the following Example.

실시예에서는 본 발명에 따라 통상의 스틸코드 코팅용 고무조성물에 이오모머를 첨가하는 조건으로 고무 시편을 제조하고, 비교예에서는 통상의 스틸코드 코팅용 고무조성물에 있어서 유황의 사용량을 증가시키는 조건으로 고무 시편을 제조하는 것을 보여준다.In the embodiment, the rubber specimen is manufactured under the condition of adding an ionomer to a rubber composition for coating a steel cord according to the present invention, and in the comparative example, under conditions for increasing the amount of sulfur in a rubber composition for coating a steel cord. Demonstrate the preparation of rubber specimens.

실시예 1Example 1

디엔계 천연고무로 국제표준 견본에 의한 암갈색 내지 황색 리브드 스모크 시트 100 중량부, 카본블랙 58 중량부, 산화아연 10 중량부, 스테아린산 1 중량부,노화방지제인 N-페닐-N'-(1,3-디메틸부틸)-p-페닐렌디아민 3 중량부, 코발트 나프텐산 3 중량부, 유황 5 중량부, 가황촉진제인 N,N-디사이클로헥실벤조티아질-2-설펜아미드 1.1 중량부 및 상기 화학식 1b의 아크릴산 마그네슘 2 중량부 배합한 것을 반바리 믹서에서 혼련한 다음 오픈롤을 이용하여 고무 시트로 제조하였다. 그런 다음 이 고무 시트를 150℃의 가류 프레스에서 30분간 가류하여 고무 시편을 제조하였다.100 parts by weight of dark brown to yellow ribbed smoke sheet according to the international standard sample, diene-based natural rubber, 58 parts by weight of carbon black, 10 parts by weight of zinc oxide, 1 part by weight of stearic acid, N-phenyl-N'- which is an anti-aging agent 3 parts by weight of 3-dimethylbutyl) -p-phenylenediamine, 3 parts by weight of cobalt naphthenic acid, 5 parts by weight of sulfur, 1.1 parts by weight of N, N-dicyclohexylbenzothiazyl-2-sulfenamide as a vulcanization accelerator, and 2 parts by weight of magnesium acrylate of Formula 1b was kneaded in a half-barrier mixer to prepare a rubber sheet using an open roll. This rubber sheet was then vulcanized for 30 minutes in a 150 ° C. vulcanization press to prepare a rubber specimen.

실시예 2Example 2

아크릴산 마그네슘을 4중량부 사용하는 것을 제외하고는 실시예 1과 동일한 방법으로 고무 시편을 제조하였다.A rubber specimen was prepared in the same manner as in Example 1 except that 4 parts by weight of magnesium acrylate was used.

실시예 3Example 3

아크릴산 마그네슘을 6중량부 사용하는 것을 제외하고는 실시예 1과 동일한 방법으로 고무 시편을 제조하였다.A rubber specimen was prepared in the same manner as in Example 1 except that 6 parts by weight of magnesium acrylate was used.

비교예Comparative example

유황을 7중량부 사용하고, 아크릴산 마그네슘을 사용하지 않는 것을 제외하고는 실시예 1과 동일한 방법으로 고무 시편을 제조하였다.A rubber specimen was prepared in the same manner as in Example 1 except for using 7 parts by weight of sulfur and not using magnesium acrylate.

이상에서 살펴본 실시예 및 비교예의 고무 시편을 제조하는데 있어서, 고무조성물의 배합량을 아래의 표 1로 정리하면 다음과 같다.In preparing the rubber specimens of the examples and comparative examples described above, the compounding amount of the rubber composition is summarized in Table 1 below.

[표 1]TABLE 1

비교예Comparative example 실시예 1Example 1 실시예 2Example 2 실시예 3Example 3 천연고무Natural rubber 100100 100100 100100 100100 카본블랙Carbon black 5858 5858 5858 5858 산화아연Zinc oxide 1010 1010 1010 1010 스테아린산Stearic acid 1One 1One 1One 1One 노화방지제Anti-aging 33 33 33 33 코발트 나프텐산Cobalt naphthenic acid 33 33 33 33 가황촉진제Vulcanization accelerator 1.11.1 1.11.1 1.11.1 1.11.1 유황brimstone 77 55 55 55 아크릴산 마그네슘Magnesium acrylate 00 22 44 66 1) 단위 : 중량부2) 천연고무 : 디엔계 천연고무로 국제표준 견본에 의한 암갈색 내지 황색 리브드 스모크 시트3) 노화방지제 : N-페닐-N'-(1,3-디메틸부틸)-p-페닐렌디아민4) 가황촉진제 : N,N-디사이클로헥실벤조티아질-2-설펜아미드1) Unit: parts by weight 2) Natural rubber: Dark brown to yellow rib smoke sheet according to international standard sample of diene-based natural rubber 3) Anti-aging agent: N-phenyl-N '-(1,3-dimethylbutyl) -p -Phenylenediamine 4) Vulcanization accelerator: N, N-dicyclohexylbenzothiazyl-2-sulfenamide

실험예Experimental Example

실험예에서는 실시예 및 비교예에서 제조한 고무 시편의 몇 가지 물성을 측정하고, 그 결과를 표 2에 나타냈다.In the experimental example, some physical properties of the rubber specimens prepared in Examples and Comparative Examples were measured, and the results are shown in Table 2.

[표 2]TABLE 2

비교예Comparative example 실시예 1Example 1 실시예 2Example 2 실시예 3Example 3 무니 점도(125℃)Mooney viscosity (125 degrees Celsius) 5858 5959 6161 6363 100% 모듈러스(㎏/㎠)100% Modulus (㎏ / ㎠) 5555 5656 6060 6363 인장강도(㎏/㎠)Tensile Strength (㎏ / ㎠) 242242 248248 252252 236236 노화후 인장강도(㎏/㎠)Tensile strength after aging (㎏ / ㎠) 158158 192192 183183 162162 내피로(cycle)Cycle 63,00063,000 82,00082,000 69,00069,000 62,00062,000 고무/스틸코드 접착력(㎏f/in)Rubber / Steel Cord Adhesion (kgf / in) 120120 116116 118118 120120

상기 표 2에서 볼수 있듯이, 본 발명에 따라 이오노머를 첨가한 고무조성물로 제조된 실시예 1 내지 실시예 3의 고무 시편은 높은 모듈러스와 우수한 내열성 및 내피로성을 갖게 되는 반면, 이오노머를 첨가하지 않고 유황의 사용량만을 증가시킨 고무조성물로 제조된 비교예의 고무 시편은 실시예에서 제조한 고무 시편에비해 낮은 모듈러스를 갖고 내열성 및 내피로성이 불량함을 알수 있다.As can be seen in Table 2, the rubber specimens of Examples 1 to 3 prepared from the rubber composition to which the ionomer is added according to the present invention have high modulus and excellent heat resistance and fatigue resistance, while sulfur without adding ionomer It can be seen that the rubber specimens of the comparative example made of the rubber composition having increased only the amount of the polymer having a low modulus and poor heat resistance and fatigue resistance compared to the rubber specimens prepared in the examples.

이상에서 설명한 바와 같이, 본 발명에 따른 스틸코드 코팅용 고무조성물은 종래와 같이 통상의 스틸코드 코팅용 고무조성물에 있어서 유황이나 카본블랙의 양을 증가시키는 대신 이오노머를 첨가시킴으로써 높은 모듈러스를 얻을 수 있으며, 더불어 우수한 내열성 및 내피로성을 달성할 수 있게 되었다.As described above, the steel cord coating rubber composition according to the present invention can obtain a high modulus by adding an ionomer instead of increasing the amount of sulfur or carbon black in the conventional rubber cord coating rubber composition. In addition, excellent heat resistance and fatigue resistance can be achieved.

Claims (3)

천연고무 또는 천연고무와 합성 이소프렌고무의 혼합물인 원료고무; 원료고무 100 중량부에 대하여 하기 화학식 1의 이오노머(ionomer)가 1 내지 60 중량부; 및 보강제, 가황제, 가류활성제, 연화제, 가공조제, 가황촉진제 및 노화방지제로 이루어진 군으로부터 선택되는 하나 이상의 첨가제를 포함하는 것을 특징으로 하는 모듈러스가 향상된 스틸코드 코팅용 고무조성물.Raw rubber which is a natural rubber or a mixture of natural rubber and synthetic isoprene rubber; 1 to 60 parts by weight of an ionomer of Formula 1 based on 100 parts by weight of the raw material rubber; And at least one additive selected from the group consisting of reinforcing agents, vulcanizing agents, vulcanizing agents, softeners, processing aids, vulcanization accelerators and anti-aging agents. [화학식 1][Formula 1] 상기 식에서, R은 H 또는 CH3이고, M은 금속이온을 나타낸다.Wherein R is H or CH 3 and M represents a metal ion. 제 1 항에 있어서,The method of claim 1, 상기 M은 Mg2+, Ba2+, Zn2+및 Al3+로 이루어진 군으로부터 선택되는 것을 특징으로 하는 스틸코드 코팅용 고무조성물.M is Mg 2+ , Ba 2+ , Zn 2+ and rubber composition for coating a steel cord, characterized in that selected from the group consisting of Al 3+ . 제 1 항에 있어서,The method of claim 1, 상기 이오노머는 하기 화학식 1a 또는 화학식 1b인 것을 특징으로 하는 스틸코드 코팅용 고무조성물.The ionomer is a rubber composition for coating a steel cord, characterized in that the formula (1a) or formula (1b). [화학식 1a][Formula 1a] [화학식 1b][Formula 1b]
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