KR20030024955A - The silica rubber composition of improved processing and dispersibility - Google Patents
The silica rubber composition of improved processing and dispersibility Download PDFInfo
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- KR20030024955A KR20030024955A KR1020010057828A KR20010057828A KR20030024955A KR 20030024955 A KR20030024955 A KR 20030024955A KR 1020010057828 A KR1020010057828 A KR 1020010057828A KR 20010057828 A KR20010057828 A KR 20010057828A KR 20030024955 A KR20030024955 A KR 20030024955A
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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
- C08L21/00—Compositions of unspecified rubbers
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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
- C08K3/02—Elements
- C08K3/04—Carbon
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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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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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
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
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Abstract
Description
본 발명은 가공성 및 분산성이 우수한 실리카 고무 조성물에 관한 것으로서, 카본블랙 대신에 실리카를 사용하고 실리카의 혼화성을 보완하기 위해서 가류흡착제로 폴리에틸렌글리콜을 적용하는 것을 특징으로 하는 가공성 및 분산성이 우수한 실리카 고무 조성물에 관한 것이다.The present invention relates to a silica rubber composition having excellent processability and dispersibility, wherein silica is used instead of carbon black and polyethylene glycol is applied as a vulcanizing adsorbent to compensate for miscibility of silica. It relates to a silica rubber composition.
실리카는 타이어 산업에서 이미 개발되어 보강재료로 널리 사용되는 카본블랙을 대체하여 사용할 수 있는 재료로서, 기존의 카본블랙이 갖는 중요한 물성 즉, 내마모성, 발열특성, 내구성 등에 영향을 미치지 않고서 타이어 산업의 새로운 보강재로 각광을 받고 있다.Silica is a material that can be used as a substitute for carbon black, which has been developed in the tire industry and widely used as a reinforcing material, and is a new material in the tire industry without affecting important properties such as wear resistance, heat generation properties, and durability. It is in the spotlight as a reinforcement material.
또한 실리카는 극성기를 함유하고 있어서, 비극성을 갖는 고무와는 혼화성이 좋지 않은 단점을 가지고 있으나, 실란커플링제를 함께 사용함으로써 실리카 충진 화합물이 저히스테리시스 카본블랙을 사용한 배합물에 비해 고온 점탄성 특성치를 낮추는데 아주 큰 영향을 준다고 알려져 있다. 그리고 실리카의 커플링 재료로 부수적인 마스킹 재료를 사용하여 실리카 표면을 개질하여 혼화성 및 가공성을 개선할 수 있다.In addition, silica contains a polar group and has a disadvantage of poor compatibility with rubber having a nonpolarity. However, by using a silane coupling agent, the silica-filled compound lowers high temperature viscoelastic properties compared to a compound using low hysteresis carbon black. It is known to have a great effect. In addition, an additional masking material may be used as the coupling material for silica to modify the silica surface to improve compatibility and processability.
이런 특성으로 인해 웨트 트랙션(Wet traction)과 회전저항성(Rolling resistance)이 상관관계를 가지고 있으며, 이런 특징은 타이어의 성능에 크게 영향을 미친다.This characteristic correlates wet traction with rolling resistance, which greatly affects tire performance.
본 발명의 목적은 카본블랙 대신에 실리카를 적용함에 있어서 실리카의 단점인 혼화성 및 분산성을 개선하기 위하여 폴리에틸렌글리콜을 적용하여 배합시 가공성과 분산성을 증가시키고, 가류시는 이런 약품이 가교촉진제의 흡착현상을 방지하여 낮은 동적 모듈러스를 제공하는 실리카 고무 조성물을 제공하는 것이다.An object of the present invention is to increase the processability and dispersibility in the formulation by applying polyethylene glycol to improve the miscibility and dispersibility, which is a disadvantage of silica in applying silica instead of carbon black, and when vulcanized, these chemicals are crosslinking accelerators. It is to provide a silica rubber composition that prevents the adsorption of the silica to provide a low dynamic modulus.
본 발명은 가공성 및 분산성이 우수한 실리카 고무 조성물에 관한 것으로서, 보다 상세하게는 고무 100phr에 대해서 카본블랙 40~60phr, 실리카 30~80phr, 폴리에틸렌글리콜 2~3phr을 포함하는 것을 특징으로 한다.The present invention relates to a silica rubber composition excellent in processability and dispersibility, and more particularly, it comprises 40 to 60 phr of carbon black, 30 to 80 phr of silica, and 2 to 3 phr of polyethylene glycol with respect to 100 phr of rubber.
본 발명에서 사용되는 카본블랙과 실리카는 일정한 비율에서 가장 우수한 역학적인 물성을 가질 수 있는데, 천연고무 100phr에 대해서 카본블랙과 실리카의 함량비율은 40:30인 경우가 가장 바람직하다.Carbon black and silica used in the present invention may have the best mechanical properties at a constant ratio, the content ratio of carbon black and silica with respect to 100 phr of natural rubber is most preferably 40:30.
본 발명에서 혼화성을 보완하기 위해서 가류흡착제로 사용되는 폴리에틸렌글리콜(PEG)은 2~3phr 사용되는 것이 바람직하고, 함유량이 증가함에 따라서 입자크기가 작아지고 응집현상이 감소된다. PEG가 2phr인 경우에는 분산효과가 우수하며, 3phr을 초과하여 과량 존재할 경우 실리카의 응집현상이 다시 나타나 분산성이 감소한다.In the present invention, polyethylene glycol (PEG) used as a vulcanizing adsorbent in order to complement the miscibility is preferably used in 2 ~ 3phr, the particle size is reduced and the aggregation phenomenon is reduced as the content is increased. When PEG is 2phr, the dispersing effect is excellent, and when it is in excess of 3phr, the flocculation phenomenon of silica reappears and dispersibility is reduced.
또한 분자량이 일정한 크기인 PEG를 사용해야만 분산성에 효과가 있는데, 이에 따른 PEG의 분자량은 2,000~10,000인 것이 바람직하다. 분자량이 2,000 미만인 경우에는 실리카 표면의 첨가제 흡착현상을 효과적으로 억제하지 못하고, 분자량이 10,000을 초과하는 경우에는 PEG의 말단 관능기(반응성 그룹)의 감소로 인하여 실리카 표면을 감싸주지 못하기 때문에 실리카 입자의 응집체가 쉽게 생성되며, 입자 크기가 증가함에 따라 최대 토오크는 증가하기 때문이다. PEG 분자량 증가에 따른 분산성은 분자량이 4,000인 경우가 가장 바람직하고, 4,000을 전후로 분산성의 균일성이 증가했다가 감소하는 경향을 보였다.In addition, there is an effect on dispersibility only by using a PEG having a constant molecular weight, it is preferable that the molecular weight of the PEG is 2,000 ~ 10,000. When the molecular weight is less than 2,000, aggregates of silica particles are not effectively suppressed because the additive adsorption phenomenon on the silica surface is not effectively suppressed, and when the molecular weight is more than 10,000, the surface of the silica cannot be wrapped due to the decrease of the terminal functional group (reactive group) of PEG Is easily produced and the maximum torque increases as the particle size increases. Dispersibility according to the increase in PEG molecular weight is most preferred when the molecular weight is 4,000, the uniformity of the dispersibility increased and then decreased around 4,000.
본 발명은 하기 실시예와 비교예에 의하여 보다 구체적으로 이해될 수 있고, 하기의 실시예는 본 발명을 예시하기 위한 것에 지나지 않으며 본 발명의 보호범위를 제한하고자 하는 것은 아니다.The present invention can be understood in more detail by the following examples and comparative examples, the following examples are only for illustrating the present invention and are not intended to limit the protection scope of the present invention.
실시예 및 비교예Examples and Comparative Examples
하기 표 1에 주요재료를 열거하였다.Table 1 lists the main materials.
PEG(Polyethylene glycol) ; 분자량 2,000~10,000까지 사용Polyethylene glycol (PEG); Use up to molecular weight 2,000 ~ 10,000
배합조성물 구성도(PEG의 영향도 조사)Composition of Compound Composition (Investigation of Peg's Effect)
실리카의 종류가 배합고무 물성에 미치는 영향은 CTAB(cetyl trimethylammonium bromide) 표면적이 큰 고무 배합물이 몰폴로지 및 제반물성에 있어서 우수하여 실리카가 충진된 고무 배합물의 물성은 CTAB에 의존하며, 카본블랙을 함유한 배합 조성물보다 역학적 물성, 인열물성, 내마모 특성 그리고 동적 점탄성이 우수할 뿐만 아니라, 실리카 함량이 증가함에 따라 기계적 물성 및 저온 점탄성 특성이 향상되었으나 가공성과 동적피로물성은 하락하는 경향을 보였다.The effect of the type of silica on the compound rubber properties is that the rubber compound with high CTAB (cetyl trimethylammonium bromide) surface area is excellent in morphology and various properties, and the physical properties of the silica-filled rubber compound depend on CTAB. In addition to mechanical properties, tear properties, wear resistance and dynamic viscoelasticity, the mechanical and low temperature viscoelastic properties were improved with increasing silica content, but the workability and dynamic fatigue properties were decreased.
실리카의 구조와 미세기공의 표면적이 실리카의 함량, 커플링제의 함량 등의저온 및 고온에서의 점탄성 특성과 관련이 있음을 제시하고, 또한 이로 인한 찢김(뜯김)과 굴신저항 및 발열저항 등과 같은 역학적 물성이 기존 카본블랙을 사용한 경우보다 상대적으로 향상됨을 나타내고 있다.It is suggested that the structure of the silica and the surface area of the micropores are related to the viscoelastic properties at low and high temperatures such as the content of silica and the content of the coupling agent, and also the mechanical properties such as tearing and bending resistance and exothermic resistance. It shows that the physical properties are relatively improved compared to the case of using the conventional carbon black.
또한 실리카의 단점인 혼화성 및 분산성을 개선하기 위하여 사용된 폴리에틸렌에 의해 가공성과 분산성이 증가되고, 가류시 이러한 약품이 가교촉진의 흡착현상을 방지하여 낮은 동적 모듈러스를 제공함을 나타내고 있다.In addition, the polyethylene used to improve the miscibility and dispersibility, which is a disadvantage of silica, is increased in processability and dispersibility, and it shows that such chemicals provide low dynamic modulus by preventing adsorption of crosslinking accelerators during vulcanization.
이상에서 알 수 있는 바와 같이, 본 발명에 의한 실리카 고무 조성물은 역학적 물성, 인열물성, 내마모 특성 그리고 동적 점탄성이 우수할 뿐만 아니라, 실리카 함량이 증가함에 따라 기계적 물성 및 저온 점탄성 특성이 향상되는 효과가 있다.As can be seen from the above, the silica rubber composition according to the present invention not only has excellent mechanical properties, tear properties, wear resistance and dynamic viscoelasticity, but also improves mechanical properties and low temperature viscoelastic properties with increasing silica content. There is.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0551491A (en) * | 1991-08-23 | 1993-03-02 | Bridgestone Corp | Rubber composition |
KR19990009413A (en) * | 1997-07-09 | 1999-02-05 | 남일 | Tread Rubber Composition |
JPH11343366A (en) * | 1998-06-01 | 1999-12-14 | Sumitomo Rubber Ind Ltd | Rubber composition for tire tread |
KR20010009096A (en) * | 1999-07-07 | 2001-02-05 | 신형인 | Low Hardness Snow Tread Compound for Ice Road Enhanced Wear Resistant |
KR20020057556A (en) * | 2001-01-05 | 2002-07-11 | 신형인 | Natural rubber compound with silica and polyethylene glycol |
-
2001
- 2001-09-19 KR KR1020010057828A patent/KR20030024955A/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0551491A (en) * | 1991-08-23 | 1993-03-02 | Bridgestone Corp | Rubber composition |
KR19990009413A (en) * | 1997-07-09 | 1999-02-05 | 남일 | Tread Rubber Composition |
JPH11343366A (en) * | 1998-06-01 | 1999-12-14 | Sumitomo Rubber Ind Ltd | Rubber composition for tire tread |
KR20010009096A (en) * | 1999-07-07 | 2001-02-05 | 신형인 | Low Hardness Snow Tread Compound for Ice Road Enhanced Wear Resistant |
KR20020057556A (en) * | 2001-01-05 | 2002-07-11 | 신형인 | Natural rubber compound with silica and polyethylene glycol |
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