KR100782981B1 - Rubber composition for hump strip of pneumatic tire - Google Patents
Rubber composition for hump strip of pneumatic tire Download PDFInfo
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- KR100782981B1 KR100782981B1 KR1020060130120A KR20060130120A KR100782981B1 KR 100782981 B1 KR100782981 B1 KR 100782981B1 KR 1020060130120 A KR1020060130120 A KR 1020060130120A KR 20060130120 A KR20060130120 A KR 20060130120A KR 100782981 B1 KR100782981 B1 KR 100782981B1
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- 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
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
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- 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
- C08K5/16—Nitrogen-containing compounds
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- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- C08L7/00—Compositions of natural rubber
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino-carboxylic acids or of polyamines and polycarboxylic acids
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- 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
- B60C2001/0075—Compositions of belt cushioning layers
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Abstract
Description
본 발명은 공기입 타이어의 험프 스트립 고무 조성물에 관한 것으로서, 더욱 상세하게는 내열성과 압축변형율, 변형에 의한 내크리프 특성 및 내마멸성을 향상시킨 공기입 타이어의 험프 스트립 고무 조성물에 관한 것이다.The present invention relates to a hump strip rubber composition of a pneumatic tire, and more particularly, to a hump strip rubber composition of a pneumatic tire having improved heat resistance and compressive strain, creep resistance due to deformation and abrasion resistance.
일반적으로 공기입 타이어의 험프 스트립은 휠의 림부와 직접 접촉하여 사용되는 것으로 주행 중 브레이크 드럼에 의해 발생된 고온의 열이 그대로 전달되기 때문에 열적 안정성이 뛰어나야 하고, 차량의 림부와 강하게 체결되기 때문에 압축변형율이 작아야 하며, 또한, 변형에 의한 내크리프(anti-creep) 특성과 내마멸성이 중요한 고무 물성으로 요구되고 있다. In general, the hump strips of pneumatic tires are used in direct contact with the rim of the wheels.The high temperature heat generated by the brake drum is transmitted as it is while driving. The strain rate must be small, and anti-creep characteristics and abrasion resistance due to deformation are required as important rubber properties.
따라서, 험프 스트립의 열적 안정성을 상승시키기 위해 기존에는 카본블랙, 유황 및 가류촉진제와 같은 첨가제를 다량 사용하거나, 천연고무 이외에 시스 1,4-폴리부타디엔과 같은 합성 고무를 혼용하고, 그 혼용 비율을 변경하거나 카본블랙의 등급을 변경하는 등의 여러 가지 기술이 사용되어 왔다. Therefore, in order to increase the thermal stability of the hump strip, conventionally, a large amount of additives such as carbon black, sulfur, and vulcanization accelerator is used, or a synthetic rubber such as cis 1,4-polybutadiene is mixed in addition to natural rubber, Various techniques have been used, such as changing or changing the grade of carbon black.
또한, 열적 안정성을 향상 시키기 위해 험프 스트립에 사용되는 고무로서 이중결합의 함량이 적은 아크릴로니트릴-부타디엔 고무를 천연고무와 함께 혼용하는 기술이 적용되고 있으나, 험프 스트립 고무의 열에 의한 노화 및 압축 변형과 여러 차례의 타이어 취부 과정에서 생기는 험프 스트립부의 변형 유발요인에 의해 크랙이 발생 및 크랙 성장에 의해 심한 경우 비드부 전체의 손상을 가져와, 타이어의 수명을 크게 저하시키게 된다.In addition, as a rubber used for hump strips to improve thermal stability, a technique in which acrylonitrile-butadiene rubber having a low content of double bonds is mixed with natural rubber is applied, but aging and compression deformation of the hump strip rubber due to heat are applied. Due to the deformation causing factors of the hump strip part during the tire mounting process several times, cracks are generated and crack growth causes severe damage to the entire bead part, thereby greatly reducing the life of the tire.
상기의 험프 스트립부의 물성 개선을 위한 기술들은 각각의 물성 특성 측면에서는 약간의 개선 효과를 보이지만 험프 스트립 고무에 필요한 여러 요구 특성들을 만족시키지 못하고 있다. The above-described techniques for improving the physical properties of the hump strips show some improvement in terms of their respective physical properties, but do not satisfy various requirements for the hump strip rubber.
예를 들어, 압축변형율을 개선하고자 하는 가류제의 증량은 초기에는 유리하나 지속적인 변형에는 약하여 열노화에 의한 고무의 경화가 빠르게 되며, 결과적으로 크랙의 발생 및 성장을 일으키게 되고, 천연고무와 시스 1,4-폴리부타디엔과 같은 합성 고무의 혼용 비율을 증가시킴으로써, 내마멸성을 향상시킨 경우에는, 열노화에 의한 고무의 터프니스 저하로 인하여 비드 토우(toe)부분이 떨어져 나가거나 크랙 발생을 일으켜 타이어의 내구성 및 재생성이 크게 저하되는 문제가 있다.For example, an increase in the amount of vulcanizing agent to improve the compressive strain is initially advantageous, but weak in continuous deformation, which leads to rapid curing of the rubber due to thermal aging, resulting in the occurrence and growth of cracks, natural rubber and sheath 1 When the abrasion resistance is improved by increasing the mixing ratio of synthetic rubber such as 4-polybutadiene, the toe portion of the rubber may fall off or crack due to the toughness of the rubber due to thermal aging. There is a problem that durability and reproducibility are greatly reduced.
공기입 타이어의 험프스트립은 휠의 림부와 직접 접촉하여 주행 중 브레이크 드럼의 사용에 의해 발생된 고온의 열이 직접적으로 전달되기 때문에 열적 안정성 및 열에 의한 고무의 인장강도 및 터프니스와 같은 물성 변화가 작아야 하며, 차량의 림부와 강하게 체결되기 때문에 뛰어난 영구압축 변형율과 변형에 의한 내크리프와 같은 특성이 요구되고 있다. Since the hump strips of pneumatic tires are in direct contact with the rim of the wheels, the high temperature heat generated by the use of brake drums is transferred directly while driving, resulting in thermal stability and physical properties such as tensile strength and toughness of the rubber due to heat. It should be small and strongly fastened with the rim of the vehicle, so that excellent properties such as permanent compression strain and creep resistance due to deformation are required.
이에 본 발명에서는 상기와 같은 종래기술의 문제들을 해결하기 위한 것으로서, 모듈러스가 우수하고, 터프니스 및 내피로성이 개선된 공기입 타이어의 험프 스트립 고무 조성물을 제공하는 데 그 목적이 있다.In the present invention, to solve the problems of the prior art as described above, an object of the present invention is to provide a hump strip rubber composition of a pneumatic tire with excellent modulus and improved toughness and fatigue resistance.
상기와 같은 목적을 달성하기 위한 본 발명의 공기입 타이어의 험프 스트립 고무 조성물은 폴리아라미드계 섬유를 원료고무 100중량부에 대하여 1 내지 3중량부로 더 포함하는 것을 그 특징으로 한다. Humph strip rubber composition of the pneumatic tire of the present invention for achieving the above object is characterized in that it further comprises 1 to 3 parts by weight of polyaramid-based fibers based on 100 parts by weight of the raw rubber.
이하, 본 발명을 더욱 상세하게 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.
본 발명의 공기입 타이어의 험프 스트립 고무 조성물은 원료고무, 보강제, 및 기타첨가제를 포함하는 조성에, 폴리아라미드계 섬유를 더 포함한다.The hump strip rubber composition of the pneumatic tire of the present invention further comprises a polyaramid-based fiber in a composition containing raw rubber, reinforcing agent, and other additives.
본 발명의 원료고무는 천연고무와 디엔계 고무가 2:8 내지 8:2의 중량비로 구성된 것이며, 상기 디엔계 고무는 통상의 공기입 타이어의 험프 스트립 고무 조성물에서 사용되는 것이면 특별히 한정되지 않는다.The raw material rubber of the present invention is composed of natural rubber and diene rubber in a weight ratio of 2: 8 to 8: 2, and the diene rubber is not particularly limited as long as it is used in a hump strip rubber composition of a conventional pneumatic tire.
또한, 본 발명의 보강제로는 카본블랙을 사용하며, 그 함량은 상기 원료고무 100중량부에 대하여 50 내지 70중량부로 사용하는 것이 바람직하다.In addition, carbon black is used as the reinforcing agent of the present invention, and the content thereof is preferably used in an amount of 50 to 70 parts by weight based on 100 parts by weight of the raw material rubber.
또한, 특별히 본 발명에서는 모듈러스 상승 및 내피로성과 내크랙성 향상을 위하여 폴리아라미드계 섬유를 포함하는 바, 그 함량은 상기 원료고무 100중량부에 대하여 1 내지 3중량부로 사용된다. 상기 폴리아라미드계 섬유의 함량이 1중량부 미만일 경우는 그 효과가 미흡하고, 3중량부를 초과할 경우 모듈러스 상승이 크며, 내피로성 및 내크랙성이 불리해지므로 바람직하지 않다. In addition, in the present invention, in order to increase the modulus and improve fatigue resistance and crack resistance, the polyaramid fiber is included, and the content thereof is used in an amount of 1 to 3 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the polyaramid-based fiber is less than 1 part by weight, the effect is insufficient, and when it exceeds 3 parts by weight, the modulus increase is large, and fatigue resistance and crack resistance become disadvantageous, which is not preferable.
본 발명에서 사용된 상기 폴리아라미드계 섬유는 파라페닐렌 테레프탈아미드와 3,4-옥시디페닐렌 테레프탈아미드의 공중합체(co-poly-(paraphenylene/3,4-oxydiphenylene terephthalamide))로서 영율(Young's modulus)이 20~21Gpa이고, 인장강도가 3,000~3,250 Mpa이며, 그 표면이 RFL 용액(Resorcinal Formaldehyde Liquid)으로 처리된 것이다. The polyaramid fiber used in the present invention is a copolymer of paraphenylene terephthalamide and 3,4-oxydiphenylene terephthalamide (co-poly- (paraphenylene / 3,4-oxydiphenylene terephthalamide)) Young's modulus (Young's) modulus) is 20 ~ 21Gpa, tensile strength is 3,000 ~ 3,250 Mpa, and the surface is treated with RFL solution (Resorcinal Formaldehyde Liquid).
또한, 본 발명에서는 상기와 같은 조성 이외에도, 통상의 험프 스트립 타이어 고무 조성물에 첨가되는 산화아연, 스테아린산, 유황, 촉진제 및 지연제 등과 같은 첨가제를 첨가할 수 있음은 물론이며, 이에 한정되는 것은 아니다.In addition, in the present invention, in addition to the above-described composition, additives such as zinc oxide, stearic acid, sulfur, accelerators, retarders and the like added to a conventional hump strip tire rubber composition may, of course, be not limited thereto.
이하에서, 실시예에 의거하여 본 발명을 더욱 상세히 설명하기로 하며, 본 발명은 이들 실시예에 의해 제한되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, and the present invention is not limited by these Examples.
실시예 및 비교예Examples and Comparative Examples
다음 표 1과 같이 각 성분을 배합하여 고무 조성물을 제조하였다. The rubber composition was prepared by blending each component as shown in Table 1 below.
[표 1] TABLE 1
상기 제조된 고무 조성물의 기본 물성을 측정하기 위하여 고무 시편을 제작하고, 고무시편을 150℃ 가류 프레스에서 30분 동안 가류하여 두께 3mm의 가류 시편을 준비하였다. 또한, 다음과 같이 물성을 측정하고, 그 결과를 다음 표 2에 나타내었다. In order to measure the basic physical properties of the prepared rubber composition, rubber specimens were prepared, and the rubber specimens were vulcanized in a 150 ° C. vulcanization press for 30 minutes to prepare vulcanization specimens having a thickness of 3 mm. In addition, the physical properties were measured as follows, and the results are shown in Table 2 below.
-인장강도 : 상기 시편을 아령 형태로 잘라 100℃ 오븐에서 48시간 방치시킨 후, 인스트론사에서 제작한 인장시험기(모델 4204)에서 인장 강도를 측정하였다. Tensile strength: After cutting the specimen in the form of a dumbbell and left for 48 hours in a 100 ℃ oven, the tensile strength was measured in a tensile tester (Model 4204) manufactured by Instron.
-내열성 : 인장 시편을 아령 형태로 잘라 100℃ 오븐에서 48시간 방치시킨 후 터프니스 변화율(%)로, 그 값이 클수록 내열성이 우수하다.-Heat resistance: The tensile specimens were cut into dumbbells and left for 48 hours in an oven at 100 ° C., followed by toughness change (%). The higher the value, the better the heat resistance.
-영구 압축 변형율 : ASTM D395와 같이 100℃ 오븐에서 96시간 경과 후 길이 변형율(%)을 측정하였으며, 그 값이 작을수록 유리하다.Permanent compressive strain: Length strain (%) was measured after 96 hours in a 100 ℃ oven as ASTM D395, the smaller the value is advantageous.
- 내크리프성 : ASTM D674와 같이 일정 하중을 가하고 시간에 따른 변형을 평가하였으며, 본 특허에서는 2시간 경과 후 변형율(%)을 측정, 비율로 표현하였으며 수 치가 클수록 유리함을 나타낸다.-Creep resistance: Deformation with time was evaluated by applying a constant load as ASTM D674. In this patent, the strain (%) is measured and expressed after 2 hours, and the larger the value, the more advantageous.
[표 2]TABLE 2
상기 표 2에 나타낸 바처럼, 본 발명과 같이 아라미드 섬유를 더 포함하는 고무 조성으로부터 제조된 시편의 경우 통상의 비교예 1, 2에 비해 열적 안정성이 10% 이상 뛰어나며, 또한, 영구 압축 변형율은 최대 22%, 내크리프 특성은 33% 수준 향상 되었다. 또한, 터프니스 유지율로 내열성을 평가하였을 때 비교예 대비 실시예가 12%~17% 이상 향상된 결과로 본 발명에 따른 고무시편의 내열성이 우수함을 알 수 있다. 특별히 험프스트립 부위는 터프니스의 실제 값보다는 노화후의 터프니스가 얼마나 유지 되는가가 더 중요한 물성인 바, 이는 타이어가 실제 차량에서 사용될 때 열을 많이 받는 부위이기 때문에 열노화에 따른 터프니스 변화량을 평가를 하고 이때 터프니스 변화가 적으면 터프니스 유지율, 간단히 내열성에서 유리하다 라고 표현한다. As shown in Table 2, in the case of the specimen prepared from a rubber composition further comprising aramid fibers as in the present invention, the thermal stability is more than 10%, compared to the conventional Comparative Examples 1 and 2, and the permanent compressive strain is maximum 22%, creep resistance improved by 33%. In addition, it can be seen that the heat resistance of the rubber specimen according to the present invention is excellent as a result of improving the heat resistance by the toughness retention rate compared to the comparative example by 12% to 17%. In particular, the hump strip area is more important to maintain the toughness after aging rather than the actual value of the toughness, and since the tire is used in a real vehicle, it is an area that receives a lot of heat. In this case, if the toughness change is small, it is advantageous in the toughness maintenance ratio and simply heat resistance.
비교예 1과 비교예 2에서와 같이 단순히 카본블랙 함량을 감량했을 경우 모듈러스가 감소하고 특히, 영구 압축 변형율과 내크리프성이 불리해지는 경향을 보이며 실시예를 통해 물성 향상을 이룰 수 있었다.When the carbon black content is simply reduced as in Comparative Example 1 and Comparative Example 2, the modulus decreases, and in particular, the permanent compressive strain and the creep resistance tend to be disadvantageous, and the physical properties can be improved through the examples.
한편, 폴리아라미드계 섬유를 5중량부로 포함하는 비교예 3의 경우 통상의 비교예 1,2에 비해 내열성 측면과, 영구 압출 변형률 및 내크리프 특성에서 향상되는 결과를 보였으나, 모듈러스의 상승이 너무 큰 관계로 내피로성 및 내크랙성이 비교예 1,2 및 실시예 대비 불리해지는 결과를 보여, 본 발명의 험프 스트립 타이어 조성으로는 적합하지 않았다. On the other hand, Comparative Example 3, which contains 5 parts by weight of polyaramid-based fibers, has been improved in terms of heat resistance, permanent extrusion strain, and creep resistance, compared to conventional Comparative Examples 1 and 2, but the increase in modulus is too high. As a result, fatigue resistance and crack resistance were disadvantageous compared to Comparative Examples 1 and 2 and the examples, which were not suitable for the hump strip tire composition of the present invention.
이상에서 상세히 설명한 바와 같이, 본 발명에 따른 험프 스트립 고무 조성물은 통상의 세미-유효 가류 시스템(Semi-Efficient Vulcanization System)을 유지하였고, 모듈러스 상승 효과를 줄이기 위해 카본 블랙 함량을 일정 중량부 줄인 결과 모듈러스를 크게 높이지 않으면서 터프니스는 향상시킬 수가 있었으며, 특히 영구압축변형율과 압축 변형에 의한 내크리프 특성이 크게 향상 되는 결과를 얻을 수 있었다.As described in detail above, the hump strip rubber composition according to the present invention maintained a conventional Semi-Efficient Vulcanization System, resulting in a reduction in the carbon black content by a certain part by weight to reduce the modulus synergy. The toughness can be improved without significantly increasing, especially the permanent compressive strain and the creep resistance due to compressive deformation can be obtained.
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| KR1020060130120A KR100782981B1 (en) | 2006-12-19 | 2006-12-19 | Rubber composition for hump strip of pneumatic tire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102150101B1 (en) * | 2019-02-21 | 2020-09-01 | 넥센타이어 주식회사 | Rubber composition for tire inner liner and Tire comprising the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6123132A (en) | 1998-01-21 | 2000-09-26 | Sumitomo Rubber Industries Limited | Tire with shoulders having a ply support strip between carcass and inner liner |
| KR20060053519A (en) * | 2004-11-17 | 2006-05-22 | 한국타이어 주식회사 | Rubber composition for studless snow tire tread |
| KR20060126185A (en) * | 2005-06-03 | 2006-12-07 | 금호타이어 주식회사 | Rubber composition for belt edge strip of tire |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6123132A (en) | 1998-01-21 | 2000-09-26 | Sumitomo Rubber Industries Limited | Tire with shoulders having a ply support strip between carcass and inner liner |
| KR20060053519A (en) * | 2004-11-17 | 2006-05-22 | 한국타이어 주식회사 | Rubber composition for studless snow tire tread |
| KR20060126185A (en) * | 2005-06-03 | 2006-12-07 | 금호타이어 주식회사 | Rubber composition for belt edge strip of tire |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102150101B1 (en) * | 2019-02-21 | 2020-09-01 | 넥센타이어 주식회사 | Rubber composition for tire inner liner and Tire comprising the same |
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