JP2006193621A - Vibration-proof rubber composition and vibration-proof rubber - Google Patents

Vibration-proof rubber composition and vibration-proof rubber Download PDF

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JP2006193621A
JP2006193621A JP2005006838A JP2005006838A JP2006193621A JP 2006193621 A JP2006193621 A JP 2006193621A JP 2005006838 A JP2005006838 A JP 2005006838A JP 2005006838 A JP2005006838 A JP 2005006838A JP 2006193621 A JP2006193621 A JP 2006193621A
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vibration
rubber
rubber composition
proof rubber
weight
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Norio Minouchi
則夫 箕内
Kouchiyu Miyaji
浩忠 宮路
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-proof rubber composition improved in dynamic-to-static modulus ratio and resistance to loss of bulkiness without impairing the other properties including mechanical strength and fatigue resistance. <P>SOLUTION: The vibration-proof rubber composition comprises 100 pts.wt. of a rubber component, i.e. at least one kind selected from the group consisting of diene rubber and ethylene-propylene-diene copolymer(EPDM), and 1-20 pts.wt. of particulate zinc oxide 10-200 m<SP>2</SP>/g in specific surface area determined by BET method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、防振ゴム組成物、特に自動車用エンジンマウントなどの防振部材として好適に用いることができる防振ゴム組成物及びこれを用いてなる防振ゴムに関する。   The present invention relates to an anti-vibration rubber composition, and more particularly to an anti-vibration rubber composition that can be suitably used as an anti-vibration member such as an engine mount for automobiles, and an anti-vibration rubber using the same.

一般に、自動車にはエンジンや車体の振動を吸収し、乗り心地の向上や車室内の騒音を防止するためマウント、ブッシュ、ダンバー等の防振ゴムが用いられている。   In general, an anti-vibration rubber such as a mount, a bush, or a damper is used in an automobile in order to absorb vibrations of an engine and a vehicle body and improve riding comfort and prevent noise in the passenger compartment.

防振ゴムの防振性能を高めるためには、防振ゴム組成物の動倍率(動バネ定数(Kd)/静バネ定数(Ks))の値が十分小さいものであることが必要とされ、従ってエンジンの振動を伝達する振動状態での動バネ定数が小さいほど、エンジンや車体の支持性能を示す静的剛性すなわち静バネ定数が大きいほど防振性能に優れるものとなっている。   In order to enhance the vibration-proof performance of the vibration-proof rubber, it is necessary that the value of the dynamic magnification (dynamic spring constant (Kd) / static spring constant (Ks)) of the vibration-proof rubber composition is sufficiently small. Accordingly, the smaller the dynamic spring constant in the vibration state for transmitting the vibration of the engine, the better the anti-vibration performance as the static rigidity indicating the support performance of the engine and the vehicle body, that is, the greater the static spring constant.

この防振ゴム組成物には、動倍率が低く強度の高い天然ゴムの単独、或いは天然ゴムを主体としてブタジエンゴムやスチレンブタジエンゴム等のジエン系ゴムをブレンドしたもの、或いは耐熱性に優れるエチレン−プロピレン−ジエン共重合体(EPDM)をゴム成分とし、特定のカーボンブラックの使用や亜鉛華を増量して動倍率を下げることが従来より行われている。   This anti-vibration rubber composition includes a natural rubber having a low dynamic magnification and high strength, a natural rubber mainly blended with a diene rubber such as butadiene rubber or styrene butadiene rubber, or ethylene- Conventionally, a propylene-diene copolymer (EPDM) is used as a rubber component, and the use of specific carbon black or increasing the amount of zinc white is used to lower the dynamic magnification.

例えば、特開2002−97307号公報には、ゴム100重量部に対して酸化亜鉛8〜30重量部と、平均粒子径40nm以下のカーボンブラックを配合したゴム組成物が提案され、また、特開2001−240703号公報では、天然ゴムなどのジエン系ゴムやエチレン−α−オレフィン系共重合ゴムに、カーボンブラック等の補強剤と酸化亜鉛を配合した防振特性に優れるゴム組成物が開示されている(特許文献1,2)。
特開2002−97307号公報 特開2001−240703号公報
For example, JP-A-2002-97307 proposes a rubber composition in which 8 to 30 parts by weight of zinc oxide and carbon black having an average particle diameter of 40 nm or less are blended with 100 parts by weight of rubber. In 2001-240703, a rubber composition excellent in vibration-proof characteristics is disclosed in which a diene rubber such as natural rubber or an ethylene-α-olefin copolymer rubber is blended with a reinforcing agent such as carbon black and zinc oxide. (Patent Documents 1 and 2).
JP 2002-97307 A JP 2001-240703 A

ところで、近年の自動車の高性能、高出力化、高級化に合わせて乗り心地の向上や車室内の静粛化の要求が次第に高まり、かかる従来のゴム組成物を用いた防振ゴムではこの様な要求に対して十分な対応が困難となり、より一層の防振特性の向上が防振ゴム組成物に要求されるようになっている。   By the way, with the recent high performance, high output, and high grade of automobiles, the demand for improvement in ride comfort and quietness of the passenger compartment is gradually increased, and such vibration-proof rubber using such a conventional rubber composition is like this. It is difficult to sufficiently respond to the demand, and further improvement of the vibration isolating characteristics is required for the vibration isolating rubber composition.

本発明は、このような点に鑑みて、強度や耐疲労性等の他の特性を低下させることなく、動倍率及び耐へたり性を改良し防振部材への幅広い適用を可能とする防振ゴム組成物及びそれを用いた防振ゴムを提供することを目的とするものである。   In view of these points, the present invention improves the dynamic magnification and sag resistance without reducing other properties such as strength and fatigue resistance, and enables wide application to vibration-proof members. An object of the present invention is to provide a vibration rubber composition and a vibration-proof rubber using the same.

上記目的を達成するため、本発明者らは、亜鉛華の添加がゴム組成物の動倍率を下げることができる点に着目し、亜鉛華の粒子構造について鋭意検討していく中で、亜鉛華粒子の微粒子化が動倍率の低減に極めて効果があることを見出し、本発明を完成するに至った。   In order to achieve the above object, the present inventors pay attention to the fact that the addition of zinc white can lower the dynamic ratio of the rubber composition, and in earnest study on the particle structure of zinc white, The inventors have found that the formation of fine particles is extremely effective in reducing the dynamic magnification, and have completed the present invention.

すなわち、本発明の防振ゴム組成物は、ジエン系ゴム及びエチレン−プロピレン−ジエン共重合体からなる群から選択された少なくとも1種をゴム成分とし、前記ゴム成分100重量部に対して、BET法により測定された比表面積が10〜200m/gである微粒子亜鉛華を1〜20重量部含有することを特徴とする。 That is, the anti-vibration rubber composition of the present invention comprises at least one selected from the group consisting of a diene rubber and an ethylene-propylene-diene copolymer as a rubber component, and BET with respect to 100 parts by weight of the rubber component. It contains 1 to 20 parts by weight of finely divided zinc white having a specific surface area measured by the method of 10 to 200 m 2 / g.

前記防振ゴム組成物において、前記微粒子亜鉛華の平均粒子径が0.001〜0.3μmであることが好ましい。   In the anti-vibration rubber composition, it is preferable that an average particle size of the fine particle zinc white is 0.001 to 0.3 μm.

また、本発明は、前記の防振ゴム組成物を用いてなる防振ゴムに関するものである。  The present invention also relates to an anti-vibration rubber using the anti-vibration rubber composition.

本発明の防振ゴム組成物では、微粒子からなる活性の高い亜鉛華を含有することで、亜鉛華が補強性充填剤としての役割と架橋促進助剤としての役割を持ち、ゴム配合中に微細に分散することでその効果を発揮する。   In the anti-vibration rubber composition of the present invention, by containing highly active zinc white composed of fine particles, zinc white has a role as a reinforcing filler and a role as a cross-linking accelerating agent. The effect is demonstrated by dispersing in.

特に架橋促進助剤としての働きは重要で動特性や補強性に影響があり、微粒子亜鉛華を高度に分散させることにより架橋を均一に配置させることができ、また架橋に関与する硫黄数の分布を狭くすることができると予想され、これらの効果により良好な動特性と耐へたり性を得ることができたと推測される。有機過酸化物架橋においても、機構は定かではないが特性の改良効果がある。   In particular, its function as a crosslinking accelerator is important and affects dynamic properties and reinforcing properties. It is possible to disperse the crosslinking uniformly by highly dispersing fine particles of zinc oxide, and the distribution of the number of sulfur involved in the crosslinking. It is presumed that good dynamic characteristics and sag resistance could be obtained by these effects. Even in organic peroxide crosslinking, although the mechanism is not clear, there is an effect of improving characteristics.

本発明の防振ゴム組成物によれば、ゴム組成物の他の特性に影響することなく動倍率を低減するとともに耐へたり性を向上し、この防振ゴム組成物を用いた防振ゴムの防振性能と耐久性を改善することができる。   According to the anti-vibration rubber composition of the present invention, the vibration ratio is reduced and the sag resistance is improved without affecting other properties of the rubber composition, and the anti-vibration rubber using this anti-vibration rubber composition The vibration-proof performance and durability can be improved.

本発明の防振ゴム組成物は、ゴム成分100重量部に対して、特定の微粒子亜鉛華を含有することでゴム組成物の動バネ定数を下げて動倍率を小さくして防振特性を向上し、併せて耐熱性を向上するものである。   The anti-vibration rubber composition of the present invention improves the anti-vibration characteristics by reducing the dynamic spring constant of the rubber composition by reducing the dynamic spring constant of the rubber composition by containing specific fine zinc oxide with respect to 100 parts by weight of the rubber component. At the same time, the heat resistance is improved.

本発明に用いられるゴム成分としては、ジエン系ゴム及びエチレン−プロピレン−ジエン共重合体(EPDM)からなる群から選択される1種の単独、或いはそれらの2種以上のブレンドをゴム成分として使用することができる。   As the rubber component used in the present invention, one kind selected from the group consisting of a diene rubber and an ethylene-propylene-diene copolymer (EPDM), or a blend of two or more kinds thereof is used as the rubber component. can do.

前記ジエン系ゴム成分としては、天然ゴム(NR)、ジエン系合成ゴムが用いられる。ジエン系合成ゴムとしては、例えば、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、ポリイソプレンゴム(IR)、アクリロニトリル−ブタジエンゴム(NBR)、イソブチレン−イソプレンゴム(IIR)、クロロプレンゴム(CR)などが挙げられる。   As the diene rubber component, natural rubber (NR) or diene synthetic rubber is used. Examples of the diene synthetic rubber include butadiene rubber (BR), styrene butadiene rubber (SBR), polyisoprene rubber (IR), acrylonitrile-butadiene rubber (NBR), isobutylene-isoprene rubber (IIR), and chloroprene rubber (CR). Etc.

特に、耐熱性を要する防振ゴム組成物では、ゴム成分として耐熱特性に優れるEPDM又はEPDMとジエン系ゴムとのブレンドを使用することが好ましい。   In particular, in an anti-vibration rubber composition that requires heat resistance, it is preferable to use EPDM or a blend of EPDM and a diene rubber having excellent heat resistance as a rubber component.

本発明に用いられる微粒子亜鉛華は、BET法により測定された比表面積が10〜200m/gである微粒子からなる亜鉛華である。BET比表面積が10m/g未満ではゴム中への微細な分散が十分でなく、ポリマーと硫黄との架橋構造分布が通常の亜鉛華の場合のように不均一となって動倍率の低減効果が得られない。また、架橋構造の均一性に欠けるため、硫黄間の結合が切断しやすく十分な補強性が得られず、耐へたり性の向上も期待できない。また、BET比表面積が200m/gを超えると亜鉛華粒子同士が凝集して分散不良を起こしやすくするおそれがある。 The fine zinc white used in the present invention is zinc white consisting of fine particles having a specific surface area of 10 to 200 m 2 / g measured by the BET method. If the BET specific surface area is less than 10 m 2 / g, fine dispersion in the rubber is not sufficient, and the cross-linking structure distribution between the polymer and sulfur is not uniform as in the case of ordinary zinc white, and the dynamic magnification reduction effect Cannot be obtained. In addition, since the cross-linked structure is not uniform, bonds between sulfur are easily broken, and sufficient reinforcement cannot be obtained, and improvement in sag resistance cannot be expected. On the other hand, if the BET specific surface area exceeds 200 m 2 / g, the zinc white particles may aggregate to easily cause poor dispersion.

また、前記微粒子亜鉛華の平均粒子径は、亜鉛華がゴム中に微細にかつ均一に分散する効果を得るうえで0.001〜0.3μmであることが好ましい。平均粒子径が0.3μmを超えるとポリマーへの微細な分散性が低下し、0.001μm未満であると粒子同士が凝集しやはり分散不良を起こしやすくする。   The average particle size of the fine zinc oxide is preferably 0.001 to 0.3 μm in order to obtain the effect that the zinc oxide is finely and uniformly dispersed in the rubber. When the average particle diameter exceeds 0.3 μm, the fine dispersibility in the polymer is lowered, and when it is less than 0.001 μm, the particles are aggregated to easily cause poor dispersion.

前記の微粒子亜鉛華は、原料として金属亜鉛地金を用いて製造されるきわめて細かい一次粒子からなる高分散性の粉末酸化亜鉛であるが、その製法としては、金属亜鉛を溶融し、気化させたものを酸化し、冷却することにより亜鉛華粉末を製造する乾式法や、亜鉛を硫酸などの酸に溶解させたあとで沈殿物を得、これを乾燥することで微粉末酸化亜鉛を製造する湿式法などがあげられるが、BET比表面積の大きさが10〜200m/gの微粒子が得られる限り、その製法は特に限定されることはない。 The finely divided zinc oxide is a highly dispersible powdered zinc oxide made of extremely fine primary particles produced using a metal zinc ingot as a raw material, and as its production method, the metal zinc was melted and vaporized. Oxidize and dry method to produce zinc white powder by cooling, wet method to produce fine powdered zinc oxide by obtaining precipitate after dissolving zinc in acid such as sulfuric acid The production method is not particularly limited as long as fine particles having a BET specific surface area of 10 to 200 m 2 / g can be obtained.

本発明においては、BET比表面積が10〜200m/gであり、好ましくは平均粒子径が0.001〜0.3μmである微粒子亜鉛華を1種で使用してもよく、2種以上を組み合わせて使用してもよい。微粒子亜鉛華の含有量は、ゴム成分100重量部に対して1〜20重量部である。亜鉛華の含有量が1重量部未満では架橋分布の均一化が不安定となって動倍率低減や耐へたり性の向上が得られず、20重量部を超えて多量に含有させても、それ以上の効果は得られない。 In the present invention, fine zinc oxide having a BET specific surface area of 10 to 200 m 2 / g and preferably an average particle diameter of 0.001 to 0.3 μm may be used alone, or two or more kinds may be used. You may use it in combination. The content of fine zinc oxide is 1 to 20 parts by weight with respect to 100 parts by weight of the rubber component. If the content of zinc white is less than 1 part by weight, the homogenization of the cross-linking distribution becomes unstable and dynamic magnification reduction and improvement in sag resistance cannot be obtained, and even if contained in excess of 20 parts by weight, No further effect can be obtained.

また、本発明の防振ゴム組成物においては、上記微粒子亜鉛華と共に従来からの通常の亜鉛華を併用することができる。この場合の使用量は、亜鉛華の総量でゴム成分100重量部に対して1〜30重量部程度が好ましい。1重量部未満では補強性や弾性率の低下が見られ、30重量部を超えると熱硬化抑制性に劣り耐へたり性が低下する。   In addition, in the vibration-proof rubber composition of the present invention, a conventional normal zinc white can be used in combination with the fine particle zinc white. The amount used in this case is preferably about 1 to 30 parts by weight with respect to 100 parts by weight of the rubber component as the total amount of zinc white. When the amount is less than 1 part by weight, the reinforcing property and the elastic modulus are lowered.

なお、亜鉛華のBET比表面積の測定はASTM D3037に基づく窒素ガス吸着量により求められるものであり、平均粒子径は走査型電子顕微鏡による20,000〜100,000倍の写真から測定されるものである。   In addition, the measurement of the BET specific surface area of zinc white is calculated | required by the nitrogen gas adsorption amount based on ASTMD3037, and an average particle diameter is measured from the 20,000-100,000 times photograph with a scanning electron microscope. It is.

本発明の防振ゴム組成物は、さらに補強用充填剤を含有することが好ましい。補強用充填剤としては、従来防振ゴム組成物において慣用されるもののなかから任意に選択して用いることができるが、主としてカーボンブラックやシリカが好ましい。   The vibration-proof rubber composition of the present invention preferably further contains a reinforcing filler. The reinforcing filler can be arbitrarily selected from those conventionally used in anti-vibration rubber compositions, but carbon black and silica are mainly preferred.

カーボンブラックとしては、窒素吸着比表面積(NSA)が100m/g以下、好ましくは60m/g以下であり、DBP吸油量が80〜150ml/100gであるものが好ましく、例えばHAF、FEF、GPF級などのカーボンブラックが挙げられ、その含有量はゴム成分100重量部に対して20〜80重量部程度である。 As the carbon black, those having a nitrogen adsorption specific surface area (N 2 SA) of 100 m 2 / g or less, preferably 60 m 2 / g or less, and a DBP oil absorption of 80 to 150 ml / 100 g are preferable. For example, HAF, FEF And carbon black such as GPF grade, and the content thereof is about 20 to 80 parts by weight with respect to 100 parts by weight of the rubber component.

上記カーボンブラックの配合範囲において、防振ゴム組成物の低動倍率化を促進するとともに、強度、剛性、耐疲労性等のゴム特性や加工性を維持することができる。   In the blending range of the carbon black, it is possible to promote a reduction in the dynamic magnification of the vibration-proof rubber composition and to maintain rubber properties such as strength, rigidity, and fatigue resistance and workability.

本発明の防振ゴム組成物には、上記ゴム成分及び微粒子亜鉛華と、通常の防振ゴム組成物に配合される公知の各種配合剤、すなわち、カーボンブラックやシリカなどのフィラー系補強剤、硫黄や有機過酸化物などの加硫剤、加硫促進剤、ステアリン酸、軟化剤、老化防止剤、加工助剤等を本発明の目的を損なわない範囲で適宜配合することができる。   In the anti-vibration rubber composition of the present invention, the rubber component and fine zinc oxide, and various known compounding agents blended in a normal anti-vibration rubber composition, that is, filler reinforcing agents such as carbon black and silica, Vulcanizing agents such as sulfur and organic peroxides, vulcanization accelerators, stearic acid, softeners, anti-aging agents, processing aids, and the like can be appropriately blended within a range that does not impair the object of the present invention.

本発明の防振ゴム組成物は、ゴム工業における通常のバンバリーミキサーやニーダを用いて混練して作製することができる。そして、このゴム組成物を防振部材として公知の加硫条件で加硫すれば、強度や耐疲労性等のゴム特性を維持し動倍率を低減しさらに耐熱性(耐へたり性)を向上した防振性能に優れた防振ゴムが得られる。   The anti-vibration rubber composition of the present invention can be prepared by kneading using an ordinary Banbury mixer or kneader in the rubber industry. If this rubber composition is vulcanized as a vibration isolator under known vulcanization conditions, the rubber properties such as strength and fatigue resistance are maintained, the dynamic magnification is reduced, and the heat resistance (sag resistance) is improved. Anti-vibration rubber with excellent anti-vibration performance is obtained.

この防振ゴム組成物を防振部材としたエンジンマウント、トーショナルダンパー、ストラットマウントなどの各種自動車用防振ゴムは優れた防振性能と耐久性能を合わせ持つものであり、防振ゴムへの高度化、多様化された要求特性に対応することができるものとなる。   Anti-vibration rubbers for automobiles such as engine mounts, torsional dampers, strut mounts, etc. that use this anti-vibration rubber composition have both excellent anti-vibration performance and durability performance. It becomes possible to cope with sophisticated and diversified demand characteristics.

本発明の防振ゴム組成物を用いてなるストラットマウントの一例を図1に示す。このストラットマウント1は、筒状胴部の内部にストラットのロッド12の先端部が導入され、該先端にベアリング14を介して取付けられる本体金具15と、自動車本体にボルト16により取付けられる取付金具17と、本体金具15と取付金具17との間に介在して両者間を弾力性を有して連結する防振ゴム11とからなり、本発明の防振ゴム組成物と金具15,17とを加硫成型してなるものである。   An example of a strut mount using the vibration-proof rubber composition of the present invention is shown in FIG. The strut mount 1 includes a main body 15 attached to a front end of a rod 12 of a strut via a bearing 14 at a front end of the rod 12 of the strut, and an attachment 17 attached to the automobile main body by a bolt 16. And an anti-vibration rubber 11 that is interposed between the main body metal fitting 15 and the mounting metal fitting 17 and elastically connects the two. The anti-vibration rubber composition of the present invention and the metal fittings 15 and 17 It is formed by vulcanization molding.

また、防振ゴムが室壁の一部を構成する液室を備え、該防振ゴムの弾性力と液体の流動効果とにより振動を減衰する液封入式ストラットマウントを用いることもできる。   It is also possible to use a liquid-filled strut mount that includes a liquid chamber in which the vibration-proof rubber forms a part of the chamber wall and attenuates vibrations by the elastic force of the vibration-proof rubber and the fluid flow effect.

以下、本発明に係る防振ゴム組成物を実施例を挙げて詳細に説明すが、本発明はこれらの実施例に何ら限定されるものではない。   Hereinafter, the vibration-insulating rubber composition according to the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

各実施例及び比較例の防振ゴム組成物を表1に示す配合内容(重量部)にて天然ゴム(NR、RSS#3)をゴム成分として、下記に示す通常の亜鉛華A、本発明に係る微粒子亜鉛華B〜D、及び共通成分として下記の各種配合剤(重量部)を配合し、容量20リットルの密閉式バンバリーミキサーを用いて混練して、実施例1〜4及び比較例1〜3のゴム組成物を作製した。   Natural rubber (NR, RSS # 3) as a rubber component in the blending contents (parts by weight) shown in Table 1 for the anti-vibration rubber compositions of each Example and Comparative Example, the following ordinary zinc white A, the present invention Examples 1 to 4 and Comparative Example 1 were prepared by blending the following fine zinc oxides B to D and various kinds of the following compounding agents (parts by weight) as common components and kneading using a 20 liter closed Banbury mixer. ~ 3 rubber compositions were prepared.

[亜鉛華]
・亜鉛華−A:BET比表面積=4m/g、平均粒子径=0.6μm(三井金属鉱業(株)、亜鉛華1号)
・亜鉛華−B:BET比表面積=10m/g、平均粒子径=0.1μm
・亜鉛華−C:BET比表面積=25m/g、平均粒子径=0.05μm
・亜鉛華−D:BET比表面積=70m/g、平均粒子径=0.01μm
[Zinc flower]
Zinc flower-A: BET specific surface area = 4 m 2 / g, average particle size = 0.6 μm (Mitsui Metal Mining Co., Ltd., Zinc Flower No. 1)
Zinc flower-B: BET specific surface area = 10 m 2 / g, average particle diameter = 0.1 μm
Zinc flower-C: BET specific surface area = 25 m 2 / g, average particle size = 0.05 μm
Zinc flower-D: BET specific surface area = 70 m 2 / g, average particle size = 0.01 μm

[共通成分及び配合量]
・カーボンブラック(CB):35重量部(昭和キャボット(株)、ショウブラックN550)
・ステアリン酸:2重量部(花王石鹸(株)、ゴム用ステアリン酸)
・老化防止剤6C:2重量部(大内新興化学工業(株)、ノクラック6C)
・老化防止剤RD:1重量部(大内新興化学工業(株)、ノクラック224)
・硫黄:1.8重量部(細井化学工業(株)、ゴム用粉末硫黄)
・加硫促進剤TT:0.2重量部(三新化学工業(株)、サンセラーTT)
・加硫促進剤CZ:1.5重量部(大内新興化学工業(株)ノクセラーCZ)
[Common ingredients and blending amounts]
Carbon black (CB): 35 parts by weight (Showa Cabot Co., Show Black N550)
・ Stearic acid: 2 parts by weight (Kao Soap Co., Ltd., stearic acid for rubber)
Anti-aging agent 6C: 2 parts by weight (Ouchi Shinsei Chemical Co., Ltd., NOCRACK 6C)
Anti-aging agent RD: 1 part by weight (Ouchi Shinsei Chemical Co., Ltd., Nocrack 224)
・ Sulfur: 1.8 parts by weight (Hosoi Chemical Co., Ltd., powdered sulfur for rubber)
・ Vulcanization accelerator TT: 0.2 parts by weight (Sanshin Chemical Industry Co., Ltd., Sunseller TT)
・ Vulcanization accelerator CZ: 1.5 parts by weight (Ouchi Shinsei Chemical Co., Ltd. Noxeller CZ)

ついで、これらのゴム組成物を150℃×25分の加硫条件で加硫して各テストピースを作製し、引張り強さ(TB)、静バネ定数(Ks)、動バネ定数(Kd)、及び圧縮永久歪率(CS)を下記の測定法に従い測定し、動倍率をKsとKdから求めた。結果を表1に示す。   Next, these rubber compositions were vulcanized under vulcanization conditions of 150 ° C. × 25 minutes to prepare each test piece, and the tensile strength (TB), static spring constant (Ks), dynamic spring constant (Kd), The compression set (CS) was measured according to the following measurement method, and the dynamic magnification was determined from Ks and Kd. The results are shown in Table 1.

[測定法]
・引張り強さ(TB)
JIS K6251に準拠し(3号形ダンベル使用)TB(MPa)を測定した。数値が大きいほど強度が高く優れる。
[Measurement method]
・ Tensile strength (TB)
TB (MPa) was measured according to JIS K6251 (using No. 3 dumbbell). The larger the value, the higher the strength and the better.

・静バネ定数(Ks)
オリエンテック(株)製テンシロンを測定機に用い、50mmφ×25mmの加硫済みテストピースにつき、10mm/minのクロスヘッドスピードで0〜5mm間の圧縮を2回繰返し、2回目の荷重−たわみ線図を描き、次式(1)に基づいて静バネ定数を算出した。 静バネ定数(N/mm)=(w2−w1)/(δ2−δ1)……(1)
ここで、w1は、たわみ量δ1が1.3mmの時の荷重(N)、w2は、たわみ量δ2が3.8mmの時の荷重(N)である。
・ Static spring constant (Ks)
Tensilon manufactured by Orientec Co., Ltd. was used as a measuring machine, and compression between 0 and 5 mm was repeated twice at a crosshead speed of 10 mm / min for a vulcanized test piece of 50 mmφ × 25 mm. Second load-deflection line The figure was drawn and the static spring constant was calculated based on the following equation (1). Static spring constant (N / mm) = (w2-w1) / (δ2-δ1) (1)
Here, w1 is a load (N) when the deflection amount δ1 is 1.3 mm, and w2 is a load (N) when the deflection amount δ2 is 3.8 mm.

・動バネ定数(Kd)
(株)鷺宮製作所製ダイナミックサーボを測定機に用い、初期歪10%、周波数100Hz、振幅±0.05mmで行い、JIS K6394に記載の計算方法により動バネ定数(N/mm)を求めた。
・ Dynamic spring constant (Kd)
The dynamic servo constant (N / mm) was calculated | required by the calculation method described in JISK6394, using the dynamic servo by Kashiwamiya Seisakusho Co., Ltd. for a measuring machine, performing initial distortion 10%, frequency 100Hz, and amplitude ± 0.05mm.

・動倍率
上記の方法で測定された静バネ定数に対する動バネ定数の比(動バネ定数(Kd)/静バネ定数(Ks))として定義されるものであり、この値が小さいほど減衰性が良好である。
Dynamic magnification is defined as the ratio of the dynamic spring constant to the static spring constant measured by the above method (dynamic spring constant (Kd) / static spring constant (Ks)). It is good.

・圧縮永久歪率(CS)
JIS K6262に準じて、120℃で500時間の熱処理を行い、CS(%)を測定した。数値が小さいほど耐熱性(耐へたり性)が良好である。
・ Compression set (CS)
According to JIS K6262, heat treatment was performed at 120 ° C. for 500 hours, and CS (%) was measured. The smaller the value, the better the heat resistance (sag resistance).

Figure 2006193621
Figure 2006193621

表1の結果に示すように、亜鉛華を増量した比較例2では、比較例1に対して動倍率と耐熱性の改善が認められなず、また、微粒子亜鉛華の含有量が少ない比較例3ではその分散の効果が発現されないが、本発明にかかる実施例1〜3は、微粒子亜鉛華を含有することにより、比較例1よりも動倍率を下げて防振ゴム組成物の防振性能を向上し、かつ圧縮永久み歪を小さくして耐熱性(耐へたり性)にも優れる。この改良効果は、亜鉛華のBET比表面積が大きく、平均粒子径が小さいほど大きく、また実施例3と実施例4の結果から規定範囲内で増量するほど効果があることが分かる。   As shown in the results of Table 1, in Comparative Example 2 in which the amount of zinc white was increased, no improvement in dynamic magnification and heat resistance was observed with respect to Comparative Example 1, and Comparative Example with a small content of fine zinc white 3 does not exhibit the effect of dispersion, but Examples 1 to 3 according to the present invention contain fine-particle zinc white, thereby lowering the dynamic magnification compared with Comparative Example 1 and providing anti-vibration performance of the anti-vibration rubber composition. In addition, it has excellent heat resistance (sag resistance) by reducing compression set distortion. It can be seen that this improvement effect is more effective as the BET specific surface area of zinc white is larger and the average particle size is smaller, and from the results of Examples 3 and 4, the effect is increased as the amount is increased within the specified range.

本発明の防振ゴム組成物は自動車の防振ゴムの防振部材に用いることでエンジンや車体の振動を効果的に吸収し、車内振動や騒音を低減し走行時の静粛性を向上することができ、また自動車用以外にも鉄道車両や建築構造物の防振ゴム、免震ゴム、橋梁や道路の支承などの防振、免震ゴム製品にも勿論適用することができる。   The anti-vibration rubber composition of the present invention can be used as an anti-vibration member for an anti-vibration rubber of an automobile to effectively absorb vibrations of the engine and the vehicle body, reduce in-vehicle vibration and noise, and improve quietness during running. In addition to automobiles, the present invention can also be applied to anti-vibration rubbers for railway vehicles and building structures, seismic isolation rubbers, anti-vibration products such as bridges and road supports, and seismic isolation rubber products.

本発明の防振ゴム組成物を用いてなるストラットマウントの一例を示す断面図である。It is sectional drawing which shows an example of the strut mount which uses the vibration-proof rubber composition of this invention.

符号の説明Explanation of symbols

1……ストラットマウント
11……防振ゴム組成物
15……本体金具
17……取付金具
1 …… Strut mount 11 …… Vibration-proof rubber composition 15 …… Body bracket 17 …… Mounting bracket

Claims (3)

ジエン系ゴム及びエチレン−プロピレン−ジエン共重合体からなる群から選択された少なくとも1種をゴム成分とし、
前記ゴム成分100重量部に対して、BET法により測定された比表面積が10〜200m/gである微粒子亜鉛華を1〜20重量部含有する
ことを特徴とする防振ゴム組成物。
The rubber component is at least one selected from the group consisting of a diene rubber and an ethylene-propylene-diene copolymer,
An anti-vibration rubber composition comprising 1 to 20 parts by weight of fine zinc oxide having a specific surface area measured by the BET method of 10 to 200 m 2 / g based on 100 parts by weight of the rubber component.
前記微粒子亜鉛華の平均粒子径が0.001〜0.3μmである
ことを特徴とする請求項1に記載の防振ゴム組成物。
The anti-vibration rubber composition according to claim 1, wherein an average particle diameter of the fine zinc oxide particles is 0.001 to 0.3 μm.
請求項1又は2に記載の防振ゴム組成物を用いてなる
ことを特徴とする防振ゴム。
An anti-vibration rubber comprising the anti-vibration rubber composition according to claim 1.
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