WO2016199623A1 - ゴム組成物、防振ゴム組成物及び防振ゴム - Google Patents
ゴム組成物、防振ゴム組成物及び防振ゴム Download PDFInfo
- Publication number
- WO2016199623A1 WO2016199623A1 PCT/JP2016/066053 JP2016066053W WO2016199623A1 WO 2016199623 A1 WO2016199623 A1 WO 2016199623A1 JP 2016066053 W JP2016066053 W JP 2016066053W WO 2016199623 A1 WO2016199623 A1 WO 2016199623A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rubber
- rubber composition
- less
- vibration
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- OWRCNXZUPFZXOS-UHFFFAOYSA-N N=C(Nc1ccccc1)Nc1ccccc1 Chemical compound N=C(Nc1ccccc1)Nc1ccccc1 OWRCNXZUPFZXOS-UHFFFAOYSA-N 0.000 description 2
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
- C08K5/31—Guanidine; Derivatives thereof
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
Definitions
- the present invention relates to a rubber composition, an anti-vibration rubber composition, and an anti-vibration rubber.
- torsional dampers Conventionally, torsional dampers, engine mounts, muffler hangers, etc. have been used in various vehicles such as automobiles for the purpose of absorbing noise when the engine is driven and preventing noise. Is used. Anti-vibration rubbers used for such applications are required to have excellent fatigue properties in addition to good heat resistance, good ozone resistance and low dynamic magnification.
- a rubber composition for a damping member is conjugated to improve the crack growth property, weather resistance (ozone resistance), and energy absorption of the damping member.
- a rubber composition for a vibration damping member comprising a rubber component comprising a diene polymer and a conjugated diene compound-nonconjugated olefin copolymer, and a resin, wherein 30 parts by mass of the resin with respect to 100 parts by mass of the rubber component Part to 80 parts by mass is described.
- Patent Document 2 in order to obtain a rubber composition for a seismic isolation structure that can reduce the decrease in elastic modulus due to repeated deformation and can reliably maintain the desired performance over a long period of time, A rubber composition for a base-isolated structure characterized by containing a high cis-isoprene rubber having a cis-form content of 90% by mass or more as a main rubber component, and a high cis-isoprene rubber Is 50% by mass or more of the total rubber component, and the content of the cis form of the high cis-isoprene rubber is 90 to 99% by mass.
- the rubber composition containing the resin as described above is often used as a vibration damping material, and is used as a rubber material for a vibration damping member such as a damper for protecting a building from a large earthquake motion. For this reason, the rubber composition does not take into consideration the characteristics such as the dynamic magnification required for the anti-vibration rubber for automobiles, and does not far reach the required characteristic values. In general, it is very difficult to maintain scorch resistance (working stability) with a rubber composition having a low dynamic magnification and enhanced fatigue characteristics.
- the present invention relates to a rubber composition, an anti-vibration rubber composition, and an anti-vibration rubber obtained by curing the rubber composition, having a low dynamic magnification, excellent fatigue characteristics, and capable of maintaining scorch resistance (working stability). The issue is to provide.
- the inventors of the present invention provide a specific guanidine compound together with a rubber component containing at least a natural rubber and a high cis content isoprene rubber having a cis-1,4 bond content of 95% by mass or more, and carbon black and silica having predetermined colloidal properties.
- a rubber composition having a low dynamic magnification, excellent fatigue characteristics and stable workability was obtained, and the present invention was completed. That is, the present invention is configured as follows.
- an anti-vibration rubber composition isoprene rubber having a cis-1,4 bond content of 95% by mass or more, an iodine adsorption amount of 20 mg / g or less, and a DBP oil absorption amount of 55 ml / 100 g or less.
- the mass ratio (a / b) between the natural rubber (a) and the high cis-content isoprene rubber (b) is 50/50 to 99/1.
- a rubber composition having a low dynamic magnification, excellent fatigue characteristics, and excellent scorch resistance (working stability), an anti-vibration rubber composition, and an anti-vibration rubber obtained by curing the rubber composition Can be provided.
- the anti-vibration rubber composition of the present invention comprises a rubber component containing at least a natural rubber and a high cis-content isoprene rubber having a cis-1,4 bond content of 95% by mass or more, an iodine adsorption amount of 35 mg / g or less, and a DBP oil absorption Carbon black having an amount of 75 ml / 100 g or less, silica having a nitrogen adsorption specific surface area (BET method) of 80 m 2 / g or more and less than 240 m 2 / g, and a compound represented by the following general formula (1) .
- BET method nitrogen adsorption specific surface area
- m and n each independently represent an integer of 1 or more.
- the hydrocarbon groups represented by —C m H 2m + 1 and —C n H 2n + 1 may be bonded to any of the ortho, meta, and para positions.
- a silane coupling agent forms a chemical bond with silica by hydrolyzing a hydrolyzable group generally represented by —OR (R is a hydrocarbon group having about 1 to 5 carbon atoms). Different silane coupling agents and silica can be firmly bonded.
- the rubber composition of the present invention contains a guanidine compound having a specific structure as a basic agent in order to increase the reaction efficiency of the hydrolysis reaction of the hydrolyzable group of the silane coupling agent.
- a guanidine compound represented by the general formula (1) steric hindrance can be intentionally provided in the guanidine compound, and as a result, the hydrolysis reaction rate of the silane coupling agent can be controlled.
- the guanidine compound represented by the general formula (1) plays a role not only as a vulcanization accelerator but also as a hydrolysis reaction aid for the silane coupling agent. Therefore, it can be considered that vulcanization starts before vulcanization of the rubber composition is started, and it becomes difficult to work due to curing, and the scorch property (working stability) is also excellent.
- the anti-vibration rubber composition and anti-vibration rubber of the present invention will be described in detail.
- the vibration-proof rubber composition of the present invention contains a rubber component containing at least a natural rubber and a high cis-content isoprene rubber having a cis-1,4 bond content of 95% by mass or more.
- the high cis-content isoprene rubber include lithium catalyst isoprene rubber and Ziegler catalyst isoprene rubber, and these can be used alone or in combination.
- the mass ratio (a / b) between the natural rubber (a) and the high cis-content isoprene rubber (b) is 50 / It is preferably 50 to 99/1. From the same viewpoint, the mass ratio (a / b) is more preferably 50/50 to 95/5, still more preferably 50/50 to 90/10, and 55/45 to 80/20. Even more preferably.
- the rubber component may include rubber other than natural rubber and high cis-content isoprene rubber (referred to as other rubber), but the other rubber is 20% by mass or less based on the total mass of the rubber component. Is preferable, 10 mass% or less is more preferable, and 5 mass% or less is still more preferable.
- the rubber component is particularly preferably composed of natural rubber and high cis content isoprene rubber.
- Other rubbers that the rubber component may contain include styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber, butyl rubber (IIR), halogenated butyl rubber, ethylene-propylene rubber (EPR, EPDM), fluorine rubber, silicone A rubber
- butadiene rubber is preferably used from the viewpoint of mechanical properties of vulcanized rubber.
- the anti-vibration rubber composition of the present invention contains the compound represented by the general formula (1).
- the compound represented by the general formula (1) is a guanidine compound and functions as a reaction accelerator for a basic silane coupling agent.
- m and n each independently represent an integer of 1 or more. When one or both of m and n are 0, the steric hindrance of the compound represented by the general formula (1) is small, and the vulcanization reaction of the rubber composition proceeds quickly.
- m and n are preferably each independently 1 to 10. When m and n are 10 or less, excessive steric hindrance can be suppressed.
- m and n are each independently more preferably 1 to 7, and further preferably 1 to 3.
- the content of the compound represented by the general formula (1) in the vibration-proof rubber composition of the present invention is preferably 0.05 to 5.0 parts by mass with respect to 100 parts by mass of the rubber component.
- the amount is more preferably 0.08 to 3.0 parts by mass, and still more preferably 0.1 to 2.5 parts by mass.
- the anti-vibration rubber composition of the present invention has a carbon black having an iodine adsorption of 35 mg / g or less and a DBP oil absorption (dibutyl phthalate oil absorption) of 75 ml / 100 g or less, and a nitrogen adsorption specific surface area (BET method) of 80 m 2 / g or more and less than 240 m 2 / g of silica.
- Carbon black and silica function as a reinforcing filler for the anti-vibration rubber composition, and can increase the elastic modulus and increase the damping property.
- the carbon black is not particularly limited as long as the iodine adsorption amount is 35 mg / g or less and the DBP oil absorption amount (dibutyl phthalate oil absorption) is 75 ml / 100 g or less, and examples thereof include carbon blacks such as SRF, FT, and MT. be able to. Moreover, these carbon blacks may be used individually by 1 type, and may use 2 or more types together.
- the iodine adsorption amount is preferably 20 mg / kg or less, and the DBP oil absorption amount is preferably 55 ml / 100 g or less.
- the iodine adsorption amount is more preferably 5 to 20 mg / kg, and the DBP oil absorption amount is more preferably 20 to 55 ml / 100 g.
- the blending amount of the carbon black is preferably 5 to 100 parts by mass with respect to 100 parts by mass of the rubber component from the viewpoint of reducing the dynamic ratio of the anti-vibration rubber composition and the anti-vibration rubber of the present invention. More preferably, it is 80 parts by mass.
- Silica if the nitrogen adsorption specific surface area (BET method) is 80 m 2 / g or more 240m less than 2 / g, not particularly limited, for example, it is preferable to use silica gel of the range.
- BET specific surface area 80 m 2 / g or more, the fatigue characteristics are excellent, and when the BET specific surface area is less than 240 m 2 / g, silica is easily dispersed in the rubber composition.
- the blending amount of silica is preferably 3 to 70 parts by mass with respect to 100 parts by mass of the rubber component, from the viewpoint of reducing the dynamic ratio of the anti-vibration rubber composition and the anti-vibration rubber of the present invention. More preferably, it is a part.
- the anti-vibration rubber composition of the present invention may contain a compounding agent used in an ordinary anti-vibration rubber composition together with the above components.
- a compounding agent used in an ordinary anti-vibration rubber composition for example, various fillers other than carbon black and silica (for example, clay, calcium carbonate, etc.), silane coupling agents, sulfur as vulcanizing agents, vulcanization accelerators, vulcanization accelerators, vulcanization retarders, various Softeners such as process oil, zinc white, stearic acid, wax, anti-aging agent, compatibilizer, workability improver, lubricant, tackifier, petroleum resin, ultraviolet absorber, dispersant, homogenizer, etc.
- the various compounding agents generally blended can be listed.
- the anti-vibration rubber composition of the present invention preferably contains a silane coupling agent.
- a silane coupling agent There is no restriction
- the compounding amount of the silane coupling agent is preferably 1 to 20% by mass and more preferably 5 to 15% by mass with respect to the total mass of the silica.
- silica is easily dispersed in the rubber composition, and the reinforcing property of the rubber composition can be improved. Even if it mixes more than 20 mass%, the effect corresponding to a compounding quantity may not be acquired, and it is preferable that it is 20 mass% or less from an industrial and economical viewpoint.
- oils can be used, and are not particularly limited. Specifically, process oils such as aromatic oils, naphthenic oils, paraffin oils, vegetable oils such as palm oil, alkylbenzene oils, etc. Synthetic oil, castor oil, etc. can be used. These can be used individually by 1 type or in combination of 2 or more types.
- zinc white (ZnO) and various vulcanization accelerating aids can be blended from the viewpoint of promoting vulcanization.
- the vulcanization accelerator include vulcanization acceleration aids such as fatty acids.
- the fatty acid may be a saturated, unsaturated, linear or branched fatty acid, and the number of carbon atoms of the fatty acid is not particularly limited, but for example, 1 to 30 carbon atoms, preferably 15 to 15 carbon atoms.
- fatty acids more specifically naphthenic acid such as cyclohexane acid (cyclohexanecarboxylic acid), alkylcyclopentane having a side chain, hexanoic acid, octanoic acid, decanoic acid (including branched carboxylic acid such as neodecanoic acid), Saturated fatty acids such as dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid (stearic acid), unsaturated fatty acids such as methacrylic acid, oleic acid, linoleic acid, linolenic acid, resin acids such as rosin, tall oil acid, abietic acid, etc.
- naphthenic acid such as cyclohexane acid (cyclohexanecarboxylic acid), alkylcyclopentane having a side chain, hexanoic acid, octanoic
- a vulcanization accelerator may be used individually by 1 type, and may use 2 or more types together.
- zinc white and stearic acid can be preferably used.
- the blending amount of the vulcanization acceleration aid is preferably 1 to 15 parts by mass, more preferably 2 to 10 parts by mass with respect to 100 parts by mass of the rubber component.
- the anti-aging agent known ones can be used, and are not particularly limited, and examples thereof include a phenol type anti-aging agent, an imidazole type anti-aging agent and an amine type anti-aging agent.
- the blending amount of these anti-aging agents is usually 0.5 to 10 parts by mass, preferably 1 to 5 parts by mass with respect to 100 parts by mass of the rubber component.
- the anti-vibration rubber composition of the present invention there is no particular limitation on the blending method of each of the above components, and all the component raw materials may be blended and kneaded at once, or divided into two or three stages. You may mix and knead
- a kneader such as a roll, an internal mixer, a Banbury rotor or the like can be used.
- a known molding machine such as an extrusion molding machine or a press machine may be used.
- the anti-vibration rubber composition of the present invention can be applied to other than the anti-vibration rubber.
- the constitution of the rubber composition of the present invention is the same as that of the vibration-proof rubber composition of the present invention, and the preferred embodiment is also the same. That is, the rubber composition of the present invention comprises a rubber component containing at least a natural rubber and a high cis content isoprene rubber having a cis-1,4 bond content of 95% by mass or more, an iodine adsorption amount of 20 mg / g or less, and a DBP oil absorption.
- the anti-vibration rubber of the present invention is obtained by curing the anti-vibration rubber composition of the present invention having the above configuration.
- the vulcanization conditions for curing the vibration-insulating rubber composition are not particularly limited, but it is usually possible to employ vulcanization conditions at 140 to 180 ° C. for 5 to 120 minutes.
- Examples 1 to 7, Comparative Examples 1 to 11 The components shown in Tables 1 and 2 below are kneaded to produce anti-vibration rubber compositions of Examples 1 to 7 and Comparative Examples 1 to 11, and then vulcanized and cured to produce anti-vibration rubbers. did. The obtained anti-vibration rubber was evaluated for fatigue characteristics (elongation fatigue), dynamic magnification (Kd / Ks), and scorch property (scorch time). The results are also shown in Tables 1 and 2.
- Scorch time was measured according to JIS K 6300-1: 2001 (how to determine viscosity and scorch time using Mooney viscometer). The scorch time was measured at 130 ° C., and the time (minutes) from the start of preheating to the anti-vibration rubbers of Examples and Comparative Examples until the value rose 5 units from the minimum value Vm was measured. In Tables 1 and 2, all of Comparative Examples 2 to 11 and Examples 1 to 7 are shown in index display based on the scorch time “100” of Comparative Example 1. The larger the index value, the longer the scorch time and the better the scorch property (working stability).
- composition of the present invention includes various anti-vibration rubber members, specifically, engine mounts, strut mounts, member mounts, suspension bushes, toe collect bushes, lower arm bushes, differential mounts, muffler hangers, spring seats of various automobiles, It is suitably used for dynamic dampers, viscous rubber dampers, center support rubbers and the like.
Landscapes
- 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)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、動倍率が低く、疲労特性に優れ、かつ耐スコーチ性(作業安定性)を維持できるゴム組成物、防振ゴム組成物、及び該ゴム組成物を硬化させてなる防振ゴムを提供することを課題とする。
すなわち、本発明は、次のように構成される。
<3> 前記天然ゴム(a)と、前記高シス含量イソプレンゴム(b)との質量比(a/b)が、50/50~99/1である<1>又は<2>に記載の防振ゴム組成物である。
<4> 更にシランカップリング剤を含有する<1>~<3>のいずれか1つに記載の防振ゴム組成物である。
<5> <1>~<4>のいずれか1つに記載の防振ゴム組成物を硬化させてなる防振ゴムである。
本発明の防振ゴム組成物は、天然ゴム及びシス-1,4結合含量が95質量%以上である高シス含量イソプレンゴムを少なくとも含むゴム成分と、ヨウ素吸着量が35mg/g以下かつDBP吸油量が75ml/100g以下のカーボンブラックと、窒素吸着比表面積(BET法)が80m2/g以上240m2/g未満のシリカと、下記一般式(1)で表される化合物と、を含有する。
-CmH2m+1及び-CnH2n+1で表される炭化水素基は、オルト位、メタ位、及びパラ位のいずれに結合していてもよい。
本発明の防振ゴム組成物が上記構成であることで動倍率が低く、耐久性が高く、かつ作業安定性にも優れる理由は定かではないが、次の理由によるものと推察される。
シランカップリング剤は、一般に-ORと表される加水分解性基(Rは炭素数1~5程度の炭化水素基)を加水分解させることにより、シリカと化学結合を形成し、化学的性質の異なるシランカップリング剤とシリカとを強固に結びつけることができる。一方で、シランカップリング剤の有機官能基(メルカプト基など)は、ポリマーと反応することでポリマーとシリカとを、シランカップリング剤を介し、化学結合させることができ、ゴムの歪みの増大に伴い応力が低下するペイン効果の低減、ゴムの補強性の向上をさせることができる。
本発明のゴム組成物は、シランカップリング剤の加水分解性基の加水分解反応の反応効率を高める為に、塩基性薬剤として、特定構造のグアニジン化合物を含有する。一般式(1)で表されるグアニジン化合物を用いることで、グアニジン化合物中に立体障害を意図的に設けることができ、その結果、シランカップリング剤の加水分解反応速度を制御することができると考えられる。つまり、一般式(1)で表されるグアニジン化合物は、加硫促進剤としてのみではなく、シランカップリング剤の加水分解反応助剤としての役割も担っていると考えられる。
従って、ゴム組成物の加硫を始める前から加硫が始まり、硬化して作業し難くなることを回避することができ、スコーチ性(作業安定性)にも優れると考えられる。
以下、本発明の防振ゴム組成物及び防振ゴムについて詳細に説明する。
本発明の防振ゴム組成物は、天然ゴム及びシス-1,4結合含量が95質量%以上である高シス含量イソプレンゴムを少なくとも含むゴム成分を含有する。
高シス含量イソプレンゴムは、リチウム触媒系イソプレンゴム、チーグラー触媒系イソプレンゴム等が挙げられ、これらを単独で、又は、混合して用いることができる。
防振ゴム組成物の動倍率をより低くし、疲労特性をより高くする観点から、天然ゴム(a)と、高シス含量イソプレンゴム(b)との質量比(a/b)は、50/50~99/1であることが好まし。同様の観点から、当該質量比(a/b)は、50/50~95/5であることがより好ましく、50/50~90/10であることが更に好ましく、55/45~80/20であることがより更に好ましい。
ゴム成分が含み得る他のゴムとしては、スチレンブタジエンゴム(SBR)、ブタジエンゴム(BR)、クロロプレンゴム、ブチルゴム(IIR)、ハロゲン化ブチルゴム、エチレン-プロピレンゴム(EPR,EPDM)、フッ素ゴム、シリコーンゴム、ウレタンゴム等が挙げられ、これらの1種又は2種以上を併用することができる。なお、これらの中では、加硫ゴムの力学的物性など観点からブタジエンゴムが好ましく用いられる。
本発明の防振ゴム組成物は、上記一般式(1)で表される化合物を含有する。
一般式(1)で表される化合物はグアニジン化合物であり、塩基性のシランカップリング剤の反応促進剤として機能する。
一般式(1)式中、mとnは、それぞれ独立に1以上の整数を表す。m及びnのどちらか一方又は両方が0であると、一般式(1)で表される化合物の立体障害が小さく、ゴム組成物の加硫反応が早く進む。m及びnは、各々独立に、1~10であることが好ましい。mとnが10以下であることで、過度の立体障害を抑制することができる。m及びnは、各々独立に、1~7であることがより好ましく、1~3であることが更に好ましい。
本発明の防振ゴム組成物は、ヨウ素吸着量が35mg/g以下かつDBP吸油量(ジブチルフタレート吸油量)が75ml/100g以下のカーボンブラックと、窒素吸着比表面積(BET法)が80m2/g以上240m2/g未満のシリカを含有する。
カーボンブラック及びシリカは、防振ゴム組成物の補強用充填材として機能し、弾性率を高くすると共に減衰性を高めることができる。
カーボンブラックとしては、ヨウ素吸着量が35mg/g以下かつDBP吸油量(ジブチルフタレート吸油量)が75ml/100g以下であれば、特に限定されず、例えば、SRF、FT、MT等のカーボンブラックを挙げることができる。また、これらのカーボンブラックは、1種を単独で用いてもよいし、2種以上を併用してもよい。
ヨウ素吸着量は20mg/kg以下であることが好ましく、DBP吸油量は55ml/100g以下であることが好ましい。
ヨウ素吸着量は5~20mg/kgであることがより好ましく、DBP吸油量は20~55ml/100gであることがより好ましい。
カーボンブラックの配合量は、本発明の防振ゴム組成物及び防振ゴムの低動倍率化の観点から、ゴム成分100質量部に対して、5~100質量部であることが好ましく、10~80質量部であることがより好ましい。
シリカの配合量は、本発明の防振ゴム組成物及び防振ゴムの低動倍率化の観点から、ゴム成分100質量部に対し、3~70質量部であることが好ましく、4~50質量部であることがより好ましい。
本発明の防振ゴム組成物は、シランカップリング剤を含有することが好ましい。
シランカップリング剤の種類については特に制限はなく公知の市販品を1種又は2種以上用いることができる。
シランカップリング剤の配合量は、シリカの配合量全質量に対して1~20質量%であることが好ましく、5~15質量%であることがより好ましい。シランカップリング剤の配合量が1質量%以上であることで、シリカがゴム組成物中に分散し易く、ゴム組成物の補強性を向上することができる。20質量%より多く配合しても配合量に見合った効果が得られない場合があり、工業的及び経済的な観点から、20質量%以下であることが好ましい。
加硫促進助剤の配合量はゴム成分100質量部に対し、好ましくは1~15質量部、より好ましくは2~10質量部である。
老化防止剤としては、公知のものを用いることができ、特に制限されないが、フェノール系老化防止剤、イミダゾール系老化防止剤、アミン系老化防止剤などを挙げることができる。これら老化防止剤の配合量は上記ゴム成分100質量部に対し、通常0.5~10質量部、好ましくは1~5質量部である。
本発明の防振ゴム組成物は、防振ゴム以外にも適用することができる。本発明のゴム組成物の構成は、本発明の防振ゴム組成物と同様であり、好ましい態様も同様である。すなわち、本発明のゴム組成物は、天然ゴム及びシス-1,4結合含量が95質量%以上である高シス含量イソプレンゴムを少なくとも含むゴム成分と、ヨウ素吸着量が20mg/g以下かつDBP吸油量が55ml/100g以下のカーボンブラックと、窒素吸着比表面積(BET法)が80m2/g以上240m2/g未満のシリカと、既述の一般式(1)で表される化合物と、を含有する。
上記構成の本発明の防振ゴム組成物を硬化させることで、本発明の防振ゴムが得られる。
防振ゴム組成物を硬化させる際の加硫条件としては、特に限定されるものはないが、通常140~180℃で、5~120分間の加硫条件を採用することができる。
下記表1及び表2に示す配合組成で各成分を混練し、実施例1~7及び比較例1~11の防振ゴム組成物を製造し、次いで、加硫硬化させ、防振ゴムを作製した。得られた防振ゴムについて、疲労特性(伸張疲労)、動倍率(Kd/Ks)、及びスコーチ性(スコーチタイム)を評価し、その結果も表1及び表2に併記した。
実施例及び比較例の防振ゴムについて、35℃で0~200%伸長を繰り返し、破断するまでの回数を計数とした。表1及び表2には、比較例2~11及び実施例1~7のいずれも、比較例1の破断回数「100」を基準としてインデックス表示で示した。
インデックス値が大きいほど、疲労特性に優れる。
実施例及び比較例の防振ゴムについて、JIS K 6385に準拠し、静バネ定数(Ks)及び動バネ定数(Kd)を測定し、動倍率(Kd/Ks)を算出した。なお、Kdは100Hzで測定した。
表1及び表2には、比較例2~11及び実施例1~7のいずれも、比較例1の動倍率「100」を基準としてインデックス表示で示した。
インデックス値が小さいほど、動倍率が低く、防振ゴムとしての性能が優れる。
JIS K 6300-1:2001(ムーニー粘度計による粘度及びスコーチタイムの求め方)に準拠して、スコーチタイムを測定した。
スコーチタイムは130℃で測定し、実施例及び比較例の防振ゴムに余熱を始めてからの値が最低値Vmより5単位上昇するまでの時間(分)を測定した。
表1及び表2には、比較例2~11及び実施例1~7のいずれも、比較例1のスコーチタイム「100」を基準としてインデックス表示で示した。
インデックス値が大きいほど、スコーチタイムが長く、スコーチ性(作業安定性)に優れる。
天然ゴム(NR):「RSS#4」
高シス含量イソプレンゴム(IR):JSR社製「IR2200」
〔シス-1,4結合含量:95質量%以上〕
イソプレンゴム(IR):Kraton社製 「Cariflex IR0307」
〔シス-1,4結合含量:91質量%〕
シランカップリング剤:デグサ社製「Si69」
FTカーボン:旭カーボン社製「旭#15」
〔ヨウ素吸着量11g/kg、DBP吸油量41ml/100g〕
GPFカーボン: CABOT製「STERLING V」
〔ヨウ素吸着量36g/kg、DBP吸油量92ml/100g〕
シリカ1:東ソー・シリカ社製「NIPSIL VN3」
〔窒素吸着比表面積(BET法)180~230m2/g〕
シリカ2:東ソー・シリカ社製「NIPSIL HD-2」
〔窒素吸着比表面積(BET法):240~320m2/g〕
シリカ3:東ソー・シリカ社製「NIPSILE-75」
〔窒素吸着比表面積(BET法):30~60m2/g〕
ステアリン酸:新日本理化製「ステアリン酸50S」
亜鉛華:ハクスイテック社製「3号亜鉛華」
ワックス:精工化学社製「サンタイト S」
老化防止剤:N-フェニル-N’-(1,3-ジメチルブチル)-p-フェニレンジアミン、大内新興化学工業社製「ノクラック 6C」
パラフィンオイル:SUN REFINING AND MARKETING COMPANY 「Sunpar2280」
硫黄:鶴見化学社製「粉末硫黄」
塩基性促進剤(DPG):大内新興化学工業社製「NOCCELER D」〔一般式(1)の-CmH2m+1及び-CnH2n+1で表される炭化水素基において、m=n=0グアニジン化合物〕
塩基性促進剤(DOTG):大内新興化学工業社製「NOCCELER DT」〔一般式(1)の-CmH2m+1及び-CnH2n+1で表される炭化水素基において、m=n=1であり、炭化水素基が共にオルト位に結合するグアニジン化合物〕
促進剤(TBT):川口化学社製「ACCEL TBT」
促進剤(CZ):川口化学社製「ACCEL CZ」
促進剤(NS):大内新興化学工業社製「NOCCELER NS-F」
Claims (6)
- 前記カーボンブラックのヨウ素吸着量が20mg/g未満かつDBP吸油量が55ml/100g未満である請求項1に記載の防振ゴム組成物。
- 前記天然ゴム(a)と、前記高シス含量イソプレンゴム(b)との質量比(a/b)が、50/50~99/1である請求項1又は請求項2に記載の防振ゴム組成物。
- 更にシランカップリング剤を含有する請求項1~請求項3のいずれか1項に記載の防振ゴム組成物。
- 請求項1~請求項4のいずれか1項に記載の防振ゴム組成物を硬化させてなる防振ゴム。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017523591A JP6760606B2 (ja) | 2015-06-10 | 2016-05-31 | ゴム組成物、防振ゴム用ゴム組成物及び防振ゴム |
| CN201680032272.7A CN107636057B (zh) | 2015-06-10 | 2016-05-31 | 橡胶组合物、防振橡胶组合物和防振橡胶 |
| EP16807330.2A EP3309200B1 (en) | 2015-06-10 | 2016-05-31 | Rubber composition, vibration reduction rubber composition, and vibration reduction rubber |
| US15/572,993 US20180142085A1 (en) | 2015-06-10 | 2016-05-31 | Rubber composition, vibration reduction rubber composition, and vibration reduction rubber |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015117750 | 2015-06-10 | ||
| JP2015-117750 | 2015-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016199623A1 true WO2016199623A1 (ja) | 2016-12-15 |
Family
ID=57504004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2016/066053 Ceased WO2016199623A1 (ja) | 2015-06-10 | 2016-05-31 | ゴム組成物、防振ゴム組成物及び防振ゴム |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20180142085A1 (ja) |
| EP (1) | EP3309200B1 (ja) |
| JP (1) | JP6760606B2 (ja) |
| CN (1) | CN107636057B (ja) |
| WO (1) | WO2016199623A1 (ja) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115594894B (zh) * | 2022-09-19 | 2024-04-16 | 中国重汽集团济南动力有限公司 | 一种商用车减震制品橡胶组合物 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001019802A (ja) * | 1999-07-09 | 2001-01-23 | Sumitomo Rubber Ind Ltd | ゴム組成物 |
| JP2003070503A (ja) * | 2001-09-06 | 2003-03-11 | Sumitomo Rubber Ind Ltd | アウトソール及びこれを備えた靴 |
| US20100059160A1 (en) * | 2008-09-08 | 2010-03-11 | Paul Harry Sandstrom | Carbon black reinforced rubber composition with aromatic guanidine antiozonant and tire having component thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3622799B2 (ja) * | 1995-09-05 | 2005-02-23 | 日本ゼオン株式会社 | ゴム組成物 |
| US6313213B1 (en) * | 1999-03-11 | 2001-11-06 | The Yokohama Rubber Co., Ltd. | Rubber composition for tire tread |
| JP2002003650A (ja) * | 2000-04-20 | 2002-01-09 | Yokohama Rubber Co Ltd:The | ゴム組成物 |
| JP2003040503A (ja) * | 2001-07-24 | 2003-02-13 | Sony Corp | 幅出装置、磁気記録媒体の製造方法および製造装置 |
| JP5798457B2 (ja) * | 2011-11-24 | 2015-10-21 | 住友ゴム工業株式会社 | ゴム組成物及び空気入りタイヤ |
| JP5767656B2 (ja) * | 2013-01-25 | 2015-08-19 | 住友ゴム工業株式会社 | カレンダー成形用のゴム組成物及びこれを用いたトッピングゴムの製造方法 |
| JP5673737B2 (ja) * | 2013-06-07 | 2015-02-18 | 株式会社ブリヂストン | 防振ゴム用ゴム組成物 |
| JP5812152B1 (ja) * | 2014-05-16 | 2015-11-11 | 横浜ゴム株式会社 | 重荷重タイヤ用ゴム組成物および空気入りタイヤ |
-
2016
- 2016-05-31 CN CN201680032272.7A patent/CN107636057B/zh not_active Expired - Fee Related
- 2016-05-31 EP EP16807330.2A patent/EP3309200B1/en active Active
- 2016-05-31 WO PCT/JP2016/066053 patent/WO2016199623A1/ja not_active Ceased
- 2016-05-31 US US15/572,993 patent/US20180142085A1/en not_active Abandoned
- 2016-05-31 JP JP2017523591A patent/JP6760606B2/ja active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001019802A (ja) * | 1999-07-09 | 2001-01-23 | Sumitomo Rubber Ind Ltd | ゴム組成物 |
| JP2003070503A (ja) * | 2001-09-06 | 2003-03-11 | Sumitomo Rubber Ind Ltd | アウトソール及びこれを備えた靴 |
| US20100059160A1 (en) * | 2008-09-08 | 2010-03-11 | Paul Harry Sandstrom | Carbon black reinforced rubber composition with aromatic guanidine antiozonant and tire having component thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| US20180142085A1 (en) | 2018-05-24 |
| EP3309200A4 (en) | 2018-07-11 |
| EP3309200B1 (en) | 2020-04-08 |
| EP3309200A1 (en) | 2018-04-18 |
| CN107636057B (zh) | 2020-04-03 |
| JPWO2016199623A1 (ja) | 2018-03-29 |
| CN107636057A (zh) | 2018-01-26 |
| JP6760606B2 (ja) | 2020-09-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6165406B2 (ja) | 防振ゴム組成物及び防振ゴム | |
| JP5673737B2 (ja) | 防振ゴム用ゴム組成物 | |
| JP7543051B2 (ja) | ゴム組成物およびゴム組成物を加硫成形してなる防振ゴム | |
| JP6369576B2 (ja) | 防振ゴム組成物及び防振ゴム | |
| JP6673351B2 (ja) | 防振ゴム組成物及び防振ゴム | |
| JP2017008161A (ja) | 防振ゴム組成物及び防振ゴム | |
| JP2010254872A (ja) | 防振ゴム用ゴム組成物 | |
| WO2018198647A1 (ja) | 防振ゴム用ゴム組成物及び車両用防振ゴム | |
| JP2006131871A (ja) | 防振ゴム組成物及び防振ゴム部材 | |
| EP3663347B1 (en) | Rubber composition for anti-vibration rubbers, and anti-vibration rubber for vehicles | |
| JP6760606B2 (ja) | ゴム組成物、防振ゴム用ゴム組成物及び防振ゴム | |
| JP2011162585A (ja) | 防振ゴム用ゴム組成物および防振ゴム | |
| JP6105426B2 (ja) | 防振ゴム組成物及び防振ゴム | |
| JP5968191B2 (ja) | 防振ゴム組成物 | |
| JP6597834B2 (ja) | 防振ゴム組成物及び防振ゴム | |
| JP2017214531A (ja) | ゴム組成物、防振ゴム製品用ゴム組成物及び防振ゴム製品 | |
| JP2010209285A (ja) | 防振ゴム用ゴム組成物および防振ゴム | |
| JP2020090665A (ja) | 防振ゴム用ゴム組成物および防振ゴム | |
| JP2018131475A (ja) | 車両用防振ゴム組成物及び車両用防振部材 | |
| WO2020179655A1 (ja) | 防振ゴム用ゴム組成物及び防振ゴム製品 | |
| JP2004285211A (ja) | 防振ゴム配合組成物及び防振ゴム | |
| JP2015000898A (ja) | 防振ゴム組成物及び防振ゴム | |
| JP2005113092A (ja) | 防振ゴム |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16807330 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 2017523591 Country of ref document: JP Kind code of ref document: A |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 15572993 Country of ref document: US |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2016807330 Country of ref document: EP |






