JP2014077050A - Rubber composition for vibration-proof rubber and vibration-proof rubber - Google Patents
Rubber composition for vibration-proof rubber and vibration-proof rubber Download PDFInfo
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本発明は、防振ゴム用ゴム組成物および防振ゴムに関し、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用ゴム組成物およびこれを用いた防振ゴムに関するものである。 The present invention relates to a rubber composition for vibration proof rubber and vibration proof rubber, and more particularly to a rubber composition for vibration proof rubber that can be suitably used as a vibration proof member for an engine mount for automobiles, and a vibration proof rubber using the same. Is.
従来から天然ゴムに補強材としてのカーボンブラックを配合したものが防振ゴムとして使用されている。近年の市場においては、防振ゴム、特に自動車用防振ゴムとして、動倍率（動的バネ定数／静的バネ定数）の低減が要求されている。 Conventionally, natural rubber blended with carbon black as a reinforcing material has been used as an anti-vibration rubber. In recent years, a reduction in dynamic magnification (dynamic spring constant / static spring constant) is required as an anti-vibration rubber, particularly an anti-vibration rubber for automobiles.
防振ゴムの低動倍率化を図るためには、天然ゴム中のカーボンブラックの分散性を高めることが重要となる。従来は、カーボンブラックとして大粒径のものを使用することで、天然ゴム中のカーボンブラックの分散性を高める方法が採用されてきたが、この方法では防振ゴムの耐久性が損なわれる傾向があった。 In order to reduce the dynamic magnification of the vibration-proof rubber, it is important to improve the dispersibility of carbon black in natural rubber. Conventionally, a method of increasing the dispersibility of carbon black in natural rubber by using carbon black having a large particle size has been adopted, but this method tends to impair the durability of the vibration-proof rubber. there were.
ところで、一般にゴム組成物においては、硫黄を含む加硫剤と併用して、加硫時間の短縮、加硫温度の低下、加硫剤の減量を目的として加硫促進剤が配合される。かかる加硫促進剤を活性化し、促進効果をさらに高めるものとして、酸化亜鉛（亜鉛華）を代表とする金属酸化物が挙げられる。下記特許文献１では、天然ゴム１００重量部に対し、微粒子化された亜鉛華を特定量配合したゴム組成物を加硫することにより、動倍率が低減された防振ゴムが得られる点が記載されている。しかしながら、本発明者が鋭意検討した結果、防振ゴムの低動倍率化の観点から、かかる特許文献に記載の技術において、さらなる改良の余地があることが判明した。 By the way, in general, in a rubber composition, a vulcanization accelerator is blended in combination with a vulcanizing agent containing sulfur for the purpose of shortening the vulcanization time, lowering the vulcanization temperature, and reducing the amount of the vulcanizing agent. A metal oxide typified by zinc oxide (zinc white) is exemplified as one that activates the vulcanization accelerator and further enhances the acceleration effect. In the following Patent Document 1, it is described that an anti-vibration rubber with reduced dynamic ratio can be obtained by vulcanizing a rubber composition containing a specific amount of finely divided zinc white with respect to 100 parts by weight of natural rubber. Has been. However, as a result of intensive studies by the inventor, it has been found that there is room for further improvement in the technique described in the patent document from the viewpoint of reducing the dynamic magnification of the vibration-proof rubber.
なお、下記特許文献２および３では、熱老化を抑制しつつ空気入りタイヤとしたときの諸物性（操縦性や乗り心地性、耐摩耗性など）を向上するために、空気入りタイヤの原料として、ＳＢＲに複合亜鉛華を添加したゴム組成物が記載されている。しかしながら、これらの文献に記載のゴム組成物は防振ゴム用として使用することが意図されているわけではなく、ましてやかかるゴム組成物を用いた場合、動倍率の低減に有効であるなどの記載や示唆があるわけではない。 In Patent Documents 2 and 3 listed below, in order to improve various physical properties (maneuverability, ride comfort, wear resistance, etc.) of a pneumatic tire while suppressing thermal aging, A rubber composition in which composite zinc white is added to SBR is described. However, the rubber compositions described in these documents are not intended to be used as anti-vibration rubbers. Furthermore, when such a rubber composition is used, it is effective to reduce dynamic magnification. There is no suggestion.
本発明は上記実情に鑑みてなされたものであり、その目的は、動倍率の低減が可能な防振ゴム用ゴム組成物および防振ゴムを提供することにある。 This invention is made | formed in view of the said situation, The objective is to provide the rubber composition for vibration-proof rubbers and vibration-proof rubber which can reduce a dynamic magnification.
本発明者らは、上記課題を解決すべく、最適なゴム種と金属酸化物との組み合わせについて鋭意検討した。その結果、天然ゴム、ブタジエンゴムおよび複合亜鉛華を特定の配合量で組み合わせて配合したゴム組成物を原料とすることで、動倍率が著しく低減された防振ゴムが得られることを見出した。本発明は、上記の検討の結果なされたものであり、下記の如き構成により上述の目的を達成するものである。 In order to solve the above-mentioned problems, the present inventors diligently studied an optimal combination of rubber type and metal oxide. As a result, it has been found that a vibration-proof rubber having a significantly reduced dynamic ratio can be obtained by using a rubber composition in which natural rubber, butadiene rubber and composite zinc white are combined in specific amounts. The present invention has been made as a result of the above-described studies, and achieves the above-described object with the following configuration.
すなわち、本発明に係る防振ゴム用ゴム組成物は、天然ゴム７０〜９０重量部およびブタジエンゴム１０〜３０重量部を含むゴム成分１００重量部に対し、複合亜鉛華を３〜５０重量部含有することを特徴とする。本発明に係る防振ゴム用ゴム組成物は、天然ゴムとブタジエンゴムおよび複合亜鉛華が特定の配合量で組み合わせて配合されているため、その加硫ゴムの動倍率が著しく低減される。 That is, the rubber composition for vibration-proof rubber according to the present invention contains 3 to 50 parts by weight of composite zinc white with respect to 100 parts by weight of a rubber component including 70 to 90 parts by weight of natural rubber and 10 to 30 parts by weight of butadiene rubber. It is characterized by doing. In the rubber composition for vibration-proof rubber according to the present invention, natural rubber, butadiene rubber, and composite zinc white are blended in a specific blending amount, so that the dynamic ratio of the vulcanized rubber is remarkably reduced.
上記防振ゴム用ゴム組成物において、前記ゴム成分１００重量部に対し、硫黄０．５〜３重量部含有することが好ましい。かかるゴム組成物を原料として得られる防振ゴムでは、耐熱性やゴム強度などを維持しつつ、動倍率を低減することができる。 In the rubber composition for vibration-proof rubber, 0.5 to 3 parts by weight of sulfur is preferably contained with respect to 100 parts by weight of the rubber component. In the vibration-proof rubber obtained by using such a rubber composition as a raw material, the dynamic magnification can be reduced while maintaining heat resistance, rubber strength, and the like.
本発明に係る防振ゴムは、前記いずれかに記載の防振ゴム用ゴム組成物を使用し、加硫、成形して得られる。かかる防振ゴムは、動倍率が著しく低減されている。 The anti-vibration rubber according to the present invention is obtained by vulcanization and molding using any of the rubber compositions for anti-vibration rubber described above. Such an anti-vibration rubber has a significantly reduced dynamic magnification.
本発明に係る防振ゴム用ゴム組成物は、天然ゴム７０〜９０重量部およびブタジエンゴム１０〜３０重量部を含むゴム成分１００重量部に対し、複合亜鉛華を３〜５０重量部含有する。加硫後に得られる防振ゴムの耐疲労性などを維持しつつ、動倍率を低減するためには、天然ゴムを７５〜８５重量部およびブタジエンゴムを１５〜２５重量部含有することが好ましい。 The rubber composition for vibration-proof rubber according to the present invention contains 3 to 50 parts by weight of composite zinc white with respect to 100 parts by weight of a rubber component including 70 to 90 parts by weight of natural rubber and 10 to 30 parts by weight of butadiene rubber. In order to reduce the dynamic magnification while maintaining the fatigue resistance of the vibration-proof rubber obtained after vulcanization, it is preferable to contain 75 to 85 parts by weight of natural rubber and 15 to 25 parts by weight of butadiene rubber.
ゴム組成物中、天然ゴムおよびブタジエンゴム以外のゴム成分を含有しても良いが、複合亜鉛華と組み合わせて、加硫ゴムの動倍率をさらに低減するためには、天然ゴムおよびブタジエンゴム以外のゴム成分の配合量は、ゴム成分の全量を１００重量部としたとき、２０重量部以下であることが好ましく、１０重量部以下であることがより好ましく、ゴム組成物のゴム成分が実質的に天然ゴムおよびブタジエンゴムからなることが特に好ましい。 The rubber composition may contain rubber components other than natural rubber and butadiene rubber, but in order to further reduce the dynamic ratio of vulcanized rubber in combination with composite zinc white, other than natural rubber and butadiene rubber. The compounding amount of the rubber component is preferably 20 parts by weight or less, more preferably 10 parts by weight or less, when the total amount of the rubber component is 100 parts by weight, and the rubber component of the rubber composition is substantially It is particularly preferable that the rubber consists of natural rubber and butadiene rubber.
本発明に係る防振ゴム用ゴム組成物では、複合亜鉛華を３〜５０重量部含有する。複合亜鉛華は、ゴム中へのキャリアーとしてのｃｏｒｅに、ＣａＣＯ３、Ｃａ（ＯＨ）２、ＣａＳＯ４、ＺｎＯ、ＭｇＯ、Ｍｇ（ＯＨ）２、ＭｇＣＯ３などを有し、そのｃｏｒｅの表面に一般の亜鉛華よりもさらに活性度の高い亜鉛華を被覆した構造を有する。かかるｃｏｒｅの大きさと亜鉛華の被覆層の厚み比率などは任意に設定可能である。かかる複合亜鉛華としては市販品も好適に使用可能であり、例えば井上石灰工業社製のＭＥＴＡ−Ｚ Ｌシリーズ（ＭＥＴＡ−Ｚ Ｌ４０、Ｌ５０、Ｌ６０）などが例示される。防振ゴム用ゴム組成物中の複合亜鉛華の配合量は、ゴム成分１００重量部に対して３〜５０重量部であり、防振ゴムの動倍率をさらに低減するためには、３〜２０重量部であることが好ましく、５〜１５重量部であることがより好ましい。 The rubber composition for vibration-proof rubber according to the present invention contains 3 to 50 parts by weight of composite zinc white. Composite zinc white has cores as carriers in rubber, such as CaCO 3 , Ca (OH) 2 , CaSO 4 , ZnO, MgO, Mg (OH) 2 , MgCO 3, etc. It has a structure in which zinc oxide having a higher activity than that of zinc oxide is coated. The size of the core and the thickness ratio of the zinc oxide coating layer can be arbitrarily set. A commercial item can also be used suitably as this composite zinc white, for example, the META-Z L series (META-Z L40, L50, L60) by Inoue Lime Industry, etc. are illustrated. The compounding amount of the composite zinc white in the rubber composition for vibration-proof rubber is 3 to 50 parts by weight with respect to 100 parts by weight of the rubber component. In order to further reduce the dynamic ratio of the vibration-proof rubber, 3 to 20 It is preferable that it is a weight part, and it is more preferable that it is 5-15 weight part.
本発明に係る防振ゴム用ゴム組成物では、硫黄系加硫剤を含有することが好ましい。かかる硫黄系加硫剤としての硫黄は通常のゴム用硫黄であればよく、例えば粉末硫黄、沈降硫黄、不溶性硫黄、高分散性硫黄などを用いることができる。本発明に係る防振ゴム用ゴム組成物における硫黄の含有量は、ゴム成分１００重量部に対して０．５〜３重量部であることが好ましい。硫黄の含有量が０．５重量部未満であると、加硫ゴムの架橋密度が不足してゴム強度などが低下し、３重量部を超えると、特に動倍率および耐熱性の両方が悪化する。加硫ゴムのゴム強度を良好に確保し、動倍率および耐熱性をより向上するためには、硫黄の含有量がゴム成分１００重量部に対して０．７〜２．０重量部であることがより好ましく、０．９〜１．５重量部であることがさらに好ましい。 The rubber composition for vibration-proof rubber according to the present invention preferably contains a sulfur vulcanizing agent. Sulfur as the sulfur-based vulcanizing agent may be normal sulfur for rubber. For example, powdered sulfur, precipitated sulfur, insoluble sulfur, highly dispersible sulfur and the like can be used. The sulfur content in the rubber composition for vibration-proof rubber according to the present invention is preferably 0.5 to 3 parts by weight with respect to 100 parts by weight of the rubber component. If the sulfur content is less than 0.5 parts by weight, the crosslinking density of the vulcanized rubber will be insufficient and the rubber strength will decrease, and if it exceeds 3 parts by weight, both the dynamic ratio and heat resistance will deteriorate. . In order to ensure good rubber strength of the vulcanized rubber and to further improve the dynamic magnification and heat resistance, the sulfur content is 0.7 to 2.0 parts by weight with respect to 100 parts by weight of the rubber component. Is more preferably 0.9 to 1.5 parts by weight.
本発明の防振ゴム用ゴム組成物は、上記ゴム成分、複合亜鉛華、硫黄系加硫剤と共に、加硫促進剤、カーボンブラック、シリカ、シランカップリング剤、ステアリン酸、加硫促進助剤、加硫遅延剤、老化防止剤、ワックスやオイルなどの軟化剤、加工助剤などの通常ゴム工業で使用される配合剤を、本発明の効果を損なわない範囲において適宜配合し用いることができる。 The rubber composition for vibration-proof rubber of the present invention comprises the above rubber component, composite zinc white, sulfur vulcanizing agent, vulcanization accelerator, carbon black, silica, silane coupling agent, stearic acid, and vulcanization acceleration aid. Additives usually used in the rubber industry, such as vulcanization retarders, anti-aging agents, softeners such as waxes and oils, processing aids, etc., can be appropriately mixed and used within a range not impairing the effects of the present invention. .
カーボンブラックとしては、例えばＳＡＦ、ＩＳＡＦ、ＨＡＦ、ＦＥＦ、ＧＰＦなどが用いられる。カーボンブラックは、加硫後のゴムの硬度、補強性、低発熱性などのゴム特性を調整し得る範囲で使用することができる。カーボンブラックの配合量はゴム成分１００重量部に対して、２０〜１２０重量部の範囲であることが好ましく、より好ましくは３０〜１００重量部であり、さらに好ましくは３０〜６０重量部である。この配合量が２０重量部未満では、カーボンブラックの補強効果が充分に得られず、１２０重量部を超えると、発熱性、ゴム混合性および加工時の作業性などが悪化する。 Examples of carbon black include SAF, ISAF, HAF, FEF, and GPF. Carbon black can be used within a range in which rubber properties such as hardness, reinforcement and low heat build-up of the rubber after vulcanization can be adjusted. The compounding amount of carbon black is preferably in the range of 20 to 120 parts by weight, more preferably 30 to 100 parts by weight, and further preferably 30 to 60 parts by weight with respect to 100 parts by weight of the rubber component. If the blending amount is less than 20 parts by weight, the reinforcing effect of carbon black cannot be sufficiently obtained. If the blending amount exceeds 120 parts by weight, exothermic properties, rubber mixing properties, workability during processing, and the like are deteriorated.
加硫促進剤としては、ゴム加硫用として通常用いられる、スルフェンアミド系加硫促進剤、チウラム系加硫促進剤、チアゾール系加硫促進剤、チオウレア系加硫促進剤、グアニジン系加硫促進剤、ジチオカルバミン酸塩系加硫促進剤などの加硫促進剤を単独、または適宜混合して使用しても良い。 As the vulcanization accelerator, sulfenamide vulcanization accelerator, thiuram vulcanization accelerator, thiazole vulcanization accelerator, thiourea vulcanization accelerator, guanidine vulcanization, which are usually used for rubber vulcanization. Vulcanization accelerators such as accelerators and dithiocarbamate vulcanization accelerators may be used alone or in admixture as appropriate.
老化防止剤としては、ゴム用として通常用いられる、芳香族アミン系老化防止剤、アミン−ケトン系老化防止剤、モノフェノール系老化防止剤、ビスフェノール系老化防止剤、ポリフェノール系老化防止剤、ジチオカルバミン酸塩系老化防止剤、チオウレア系老化防止剤などの老化防止剤を単独、または適宜混合して使用しても良い。 As an anti-aging agent, an aromatic amine-based anti-aging agent, an amine-ketone-based anti-aging agent, a monophenol-based anti-aging agent, a bisphenol-based anti-aging agent, a polyphenol-based anti-aging agent, dithiocarbamic acid, which are usually used for rubber Anti-aging agents such as a salt-based anti-aging agent and a thiourea-based anti-aging agent may be used alone or in an appropriate mixture.
本発明の防振ゴム用ゴム組成物は、上記ゴム成分、複合亜鉛華、硫黄系加硫剤、必要に応じて、カーボンブラック、ステアリン酸、加硫促進剤、老化防止剤、ワックスなどを、バンバリーミキサー、ニーダー、ロールなどの通常のゴム工業において使用される混練機を用いて混練りすることにより得られる。 The rubber composition for vibration-proof rubber of the present invention comprises the above rubber component, composite zinc white, sulfur vulcanizing agent, and if necessary, carbon black, stearic acid, vulcanization accelerator, anti-aging agent, wax, etc. It can be obtained by kneading using a kneader such as a Banbury mixer, a kneader, or a roll, which is used in a normal rubber industry.
また、上記各成分の配合方法は特に限定されず、硫黄系加硫剤、および加硫促進剤などの加硫系成分以外の配合成分を予め混練してマスターバッチとし、残りの成分を添加してさらに混練する方法、各成分を任意の順序で添加し混練する方法、全成分を同時に添加して混練する方法などのいずれでもよい。 In addition, the blending method of each of the above components is not particularly limited, and a blending component other than a vulcanizing component such as a sulfur vulcanizing agent and a vulcanization accelerator is previously kneaded to obtain a master batch, and the remaining components are added. Any of a method of further kneading, a method of adding and kneading each component in an arbitrary order, a method of adding all components simultaneously and kneading may be used.
上記各成分を混練し、成形加工した後、加硫を行うことで、低動倍率である防振ゴムを製造することができる。かかる防振ゴムは、エンジンマウント、トーショナルダンパー、ボディマウント、メンバーマウント、ストラットマウント、マフラーマウントなどの自動車用防振ゴムを始めとして、鉄道車両用防振ゴム、産業機械用防振ゴムに好適に用いることができ、特にエンジンマウントなどの低動倍率を必要とする自動車用防振ゴムの構成部材として有用である。 Anti-vibration rubber having a low dynamic magnification can be produced by kneading and molding each of the above components, followed by vulcanization. Such anti-vibration rubber is suitable for anti-vibration rubber for automobiles such as engine mount, torsional damper, body mount, member mount, strut mount, muffler mount, etc. In particular, it is useful as a component of a vibration-proof rubber for automobiles that require a low dynamic magnification such as an engine mount.
以下に、この発明の実施例を記載してより具体的に説明する。 Hereinafter, the present invention will be described in more detail with reference to examples.
（ゴム組成物の調製）
ゴム成分１００重量部に対して、表１の配合処方に従い、実施例１〜６、比較例１〜２のゴム組成物を配合し、通常のバンバリーミキサーを用いて混練し、ゴム組成物を調整した。表１に記載の各配合剤を以下に示す。
(Preparation of rubber composition)
The rubber composition of Examples 1 to 6 and Comparative Examples 1 and 2 is blended with 100 parts by weight of the rubber component according to the formulation of Table 1, and kneaded using a normal Banbury mixer to prepare the rubber composition. did. Each compounding agent described in Table 1 is shown below.
ａ）ゴム成分
天然ゴム（ＮＲ） 「ＲＳＳ＃３」
ブタジエンゴム（ＢＲ） 「Ｂｕｎａ ＣＢ２２」（バイエル社製）
ｂ）複合亜鉛華 「ＭＥＴＡ−Ｚ Ｌ６０」（井上石灰工業社製）
酸化亜鉛 「３号ＺｎＯ」
ｃ）ステアリン酸 （日油社製）
ｄ）ワックス 「ＯＺＯＡＣＥ−２７０１」（日本精蝋社製）
ｅ）カーボンブラック（ＧＰＦ） 「シーストＶ」（東海カーボン社製）
ｆ）老化防止剤
（Ａ）Ｎ−（１，３−ジメチルブチル）−Ｎ’−フェニル−ｐ−フェニレンジアミン 「アンテージ６Ｃ」（川口化学工業社製）
（Ｂ）２，２，４−トリメチル−１，２−ジヒドロキノリン重合体 （「ノンフレックスＲＤ」、精工化学社製）
ｇ）オイル 「ＪＯＭＯ ＮＣ１４０」（ＪＸ日鉱日石エネルギー社製）
ｈ）硫黄 ５％オイル処理硫黄
加硫促進剤
（Ａ）スルフェンアミド系加硫促進剤 Ｎ−シクロヘキシル−２−ベンゾチアゾリルスルフェンアミド 「ノクセラー ＣＺ−Ｇ（ＣＺ）」、大内新興化学工業社製
（Ｂ）チウラム化合物 テトラメチルチウラムモノスルフィド 「ノクセラーＴＳ（ＴＳ−Ｐ）」、大内新興化学工業社製
a) Rubber component
Natural rubber (NR) "RSS # 3"
Butadiene rubber (BR) “Buna CB22” (manufactured by Bayer)
b) Composite zinc white "META-Z L60" (manufactured by Inoue Lime Industry Co., Ltd.)
Zinc oxide "No. 3 ZnO"
c) Stearic acid (manufactured by NOF Corporation)
d) Wax “OZOACE-2701” (manufactured by Nippon Seiwa Co., Ltd.)
e) Carbon Black (GPF) “Seast V” (manufactured by Tokai Carbon Co., Ltd.)
f) Anti-aging agent (A) N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine “ANTAGE 6C” (manufactured by Kawaguchi Chemical Co., Ltd.)
(B) 2,2,4-trimethyl-1,2-dihydroquinoline polymer ("Nonflex RD", manufactured by Seiko Chemical Co., Ltd.)
g) Oil “JOMO NC140” (manufactured by JX Nippon Oil & Energy Corporation)
h) Sulfur 5% oil-treated sulfur vulcanization accelerator (A) Sulfenamide vulcanization accelerator N-cyclohexyl-2-benzothiazolylsulfenamide "Noxeller CZ-G (CZ)", Ouchi Shinsei Chemical Industry (B) Thiuram compound Tetramethylthiuram monosulfide “Noxeller TS (TS-P)”, manufactured by Ouchi Shinsei Chemical Co., Ltd.
（評価）
評価は、各ゴム組成物を所定の金型を使用して、１６０℃で２０分間加熱、加硫して得られたゴムについて行った。
(Evaluation)
The evaluation was performed on rubbers obtained by heating and vulcanizing each rubber composition at 160 ° C. for 20 minutes using a predetermined mold.
＜動倍率（動的バネ定数／静的バネ定数）＞
動倍率は、動的バネ定数および静的バネ定数を測定することにより算出した。
<Dynamic magnification (dynamic spring constant / static spring constant)>
The dynamic magnification was calculated by measuring the dynamic spring constant and the static spring constant.
（１）動的バネ定数
測定機として、島津製作所社製「サーボパルサーＥＨＦ−Ｅシリーズ」を使用し、初期歪１０％、周波数１００Ｈｚ、振幅±０．０５ｍｍとして、ＪＩＳ Ｋ ６３９４に記載の計算方法により算出した。
(1) Dynamic spring constant Calculation method described in JIS K 6394 using “Servo Pulsar EHF-E Series” manufactured by Shimadzu Corporation as a measuring machine, assuming initial strain 10%, frequency 100 Hz, amplitude ± 0.05 mm. Calculated by
（２）静的バネ定数
測定機として、島津製作所社製「サーボパルサーＥＨＦ−Ｅシリーズ」を使用し、φ５０ｍｍ×２５ｍｍの加硫ゴムテストピースに、０．７ｍｍ／ｓｅｃのクロスヘッドスピードで０〜５ｍｍ間の予備圧縮を２回繰り返し、次に０．１６７ｍｍ／ｓｅｃのクロスヘッドスピードで０〜５ｍｍ間の本圧縮を１回行った。３回目の荷重−たわみ線図を描き、下記式（１）に基づいて算出した。
(2) Static spring constant “Servo Pulsar EHF-E Series” manufactured by Shimadzu Corporation is used as a measuring machine, and a vulcanized rubber test piece of φ50 mm × 25 mm is used with a crosshead speed of 0.7 mm / sec. Pre-compression between 5 mm was repeated twice, and then main compression between 0 and 5 mm was performed once at a crosshead speed of 0.167 mm / sec. A third load-deflection diagram was drawn and calculated based on the following formula (1).
（静的バネ定数（Ｎ／ｍｍ））＝（ｗ２−ｗ１）／（δ２−δ１） （１）
（上記式（１）において、ｗ１；たわみ量δ１が１．３ｍｍ時の荷重（Ｎ）、ｗ２；たわみ量δ２が３．８ｍｍ時の荷重（Ｎ））
算出した動的バネ定数と静的バネ定数とに基づき、動倍率を算出した。評価結果を表１に示す。
(Static spring constant (N / mm)) = (w2-w1) / (δ2-δ1) (1)
(In the above formula (1), w1; load (N) when the deflection amount δ1 is 1.3 mm, w2; load (N) when the deflection amount δ2 is 3.8 mm)
The dynamic magnification was calculated based on the calculated dynamic spring constant and static spring constant. The evaluation results are shown in Table 1.
表１の結果から、汎用の酸化亜鉛を配合した比較例１に係るゴム組成物の加硫ゴムに比べて、ゴム成分１００重量部に対して複合亜鉛華を２．５重量部配合したゴム組成物の加硫ゴム（比較例２）では、動倍率の向上が殆ど見られなかった。一方、天然ゴム８０重量部とブタジエンゴム２０重量部に対して、複合亜鉛華を５〜４０重量部配合したゴム組成物（実施例１〜５）では、天然ゴムとブタジエンゴムと複合亜鉛華との相互作用によって、動倍率が著しく向上した。 From the results of Table 1, the rubber composition containing 2.5 parts by weight of composite zinc white per 100 parts by weight of the rubber component as compared with the vulcanized rubber of the rubber composition according to Comparative Example 1 containing general-purpose zinc oxide. In the vulcanized rubber (Comparative Example 2), the dynamic magnification was hardly improved. On the other hand, in the rubber composition (Examples 1 to 5) in which 5 to 40 parts by weight of composite zinc white is blended with 80 parts by weight of natural rubber and 20 parts by weight of butadiene rubber, natural rubber, butadiene rubber and composite zinc white The dynamic magnification was significantly improved by the interaction.
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| JP2016155888A (en) * | 2015-02-23 | 2016-09-01 | 株式会社ブリヂストン | Rubber composition for vibration proof rubber and vibration proof rubber |
| WO2017104251A1 (en) | 2015-12-16 | 2017-06-22 | 東洋ゴム工業株式会社 | Rubber composition for vibration-damping rubber |
| DE102017120082A1 (en) | 2016-11-22 | 2018-05-24 | Toyo Tire & Rubber Co., Ltd. | Rubber composition for vibration resistant rubbers |
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| WO2016120991A1 (en) * | 2015-01-27 | 2016-08-04 | 東洋ゴム工業株式会社 | Rubber composition for vibration damping rubbers, and vibration damping rubber |
| US10138360B2 (en) | 2015-01-27 | 2018-11-27 | Toyo Tire & Rubber Co., Ltd. | Rubber composition for vibration damping rubbers, and vibration damping rubber |
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| US20180305525A1 (en) * | 2015-12-16 | 2018-10-25 | Toyo Tire & Rubber Co., Ltd. | Rubber composition for vibration-damping rubber |
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| DE102017120082B4 (en) | 2016-11-22 | 2022-10-06 | Toyo Tire & Rubber Co., Ltd. | Use of a rubber composition for vibration resistant rubbers |
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