JP2012117004A - 防振ゴム組成物及び防振ゴム - Google Patents
防振ゴム組成物及び防振ゴム Download PDFInfo
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- JP2012117004A JP2012117004A JP2010270118A JP2010270118A JP2012117004A JP 2012117004 A JP2012117004 A JP 2012117004A JP 2010270118 A JP2010270118 A JP 2010270118A JP 2010270118 A JP2010270118 A JP 2010270118A JP 2012117004 A JP2012117004 A JP 2012117004A
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- rubber
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- peroxide
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- 229920003052 natural elastomer Polymers 0.000 claims abstract description 27
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Abstract
【解決手段】ゴム成分として天然ゴム(NR)とエチレン・プロピレン・ジエンゴム(EPDM)とを、質量比でNR/EPDM=70/30〜45/55の割合で含むと共に、加硫剤として過酸化物を含み、かつ共架橋剤としてアクリル酸亜鉛またはメタクリル酸亜鉛、及び液状ポリブタジエンを含むことを特徴とする防振ゴム組成物。
【選択図】なし
Description
[1]ゴム成分として天然ゴム(NR)とエチレン・プロピレン・ジエンゴム(EPDM)とを、質量比でNR/EPDM=70/30〜45/55の割合で含むと共に、加硫剤として過酸化物及び共架橋剤としてアクリル酸亜鉛またはメタクリル酸亜鉛を含み、更に、液状ポリブタジエンを含むことを特徴とする防振ゴム組成物。
[2]液状ポリブタジエンの数平均分子量が5000以下である[1]記載の防振ゴム組成物。
[3]液状ポリブタジエンの配合量がゴム成分100質量部に対して3質量部以上である[1]又は[2]記載の防振ゴム組成物。
[4][1]、[2]又は[3]記載のゴム組成物を硬化させてなる防振ゴム。
下記表1に示す配合組成で混練し加硫して、実施例1〜12及び比較例1の各々の防振ゴム組成物を所定の条件で加硫硬化させ、長さ120mm×幅120mm×厚さ2mmのシート成型物を作製した。このシートを本発明の防振ゴムの評価体とした。得られたゴムシートについて、硬度(Hd)、引張伸び(Eb)、引張強さ(Tb)を測定し、圧縮永久歪み(%)、静バネ定数(Ks)、動倍率(Kd/Ks)を下記JIS規格に準拠して測定を行い評価した。その結果を表1に記載した。
JIS K 6253(タイプA)に準拠した。
[引張伸び(Eb)]
JIS K 6251に準拠した。
[引張強さ(Tb)]
JIS K 6251に準拠した。
[圧縮永久歪み]
JIS K 6262に準拠した。
[静バネ定数(Ks),動バネ定数(Kd)及び動倍率(Kd/Ks)]
JIS K 6385に準拠し、Kdは100Hzで測定した。
[ムーニー粘度及びムーニースコーチタイムの測定]
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)に準拠した。ムーニースコーチタイムは、ゴム組成物を130℃で測定し、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を測定した。ムーニースコーチタイムの数値が大きい程、加工安定性(スコーチ安定性)が良好になることを示す。
(1)NR:天然ゴム、「RSS#1」
(2)EPDM:JSR製の「EP96」、ENB含量 6.0質量%、エチレン含量 66質量%(ポリマー成分:30phr,オイル成分:15phr)
(3)FEF級カーボンブラック:旭カーボン製「旭 #65」
(4)老化防止剤:2,2,4−トリメチル−1,2−ジヒドロキノリン重合体、大内新興化学工業(株)製の「ノクラック224」
(5)過酸化物:ジ(2−t−ブチルパーオキシイソプロピル)ベンゼン、日油社製「ペロキシモンF−40」
(6)ZMA(メタクリル酸亜鉛)川口化学工業社製「ZMA」
(7)ZA(アクリル酸亜鉛、サートマー社製の「SR633」
(8)液状ポリブタジエン
「Ricon 153」(分子量Mn:4700)
「Ricon 154」(分子量Mn:5200)
「Ricon 150」(分子量Mn:3900)
「Ricon 157」(分子量Mn:1800)
いずれもサートマー社製
これに対して、比較例1では、低動倍率の改善がやや小さく、耐クリープ性(圧縮永久歪み)に劣り、ムーニースコーチタイムが短かった。
Claims (4)
- ゴム成分として天然ゴム(NR)とエチレン・プロピレン・ジエンゴム(EPDM)とを、質量比でNR/EPDM=70/30〜45/55の割合で含むと共に、加硫剤として過酸化物及び共架橋剤としてアクリル酸亜鉛またはメタクリル酸亜鉛を含み、更に、液状ポリブタジエンを含むことを特徴とする防振ゴム組成物。
- 液状ポリブタジエンの数平均分子量が5000以下である請求項1記載の防振ゴム組成物。
- 液状ポリブタジエンの配合量がゴム成分100質量部に対して3質量部以上である請求項1又は2記載の防振ゴム組成物。
- 請求項1、2又は3記載のゴム組成物を硬化させてなる防振ゴム。
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| KR101364811B1 (ko) * | 2012-09-06 | 2014-02-20 | (주)에나인더스트리 | 탄소나노튜브의 절단 방법 |
| JP2019048959A (ja) * | 2017-09-12 | 2019-03-28 | 株式会社ブリヂストン | 防振ゴム用ゴム組成物及び防振ゴム製品 |
| US11078349B2 (en) | 2019-04-24 | 2021-08-03 | Fina Technology, Inc. | Curable low sulfur liquid rubber compositions |
| CN114395260A (zh) * | 2022-01-06 | 2022-04-26 | 江苏艾塔新材料有限公司 | 一种甲基丙烯酸金属盐预分散母胶粒及其制备方法 |
| JP2022161278A (ja) * | 2021-04-08 | 2022-10-21 | 住友ゴム工業株式会社 | 防舷材用ゴム組成物とそれを用いた防舷材 |
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| KR101364811B1 (ko) * | 2012-09-06 | 2014-02-20 | (주)에나인더스트리 | 탄소나노튜브의 절단 방법 |
| JP2019048959A (ja) * | 2017-09-12 | 2019-03-28 | 株式会社ブリヂストン | 防振ゴム用ゴム組成物及び防振ゴム製品 |
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| JP2022161278A (ja) * | 2021-04-08 | 2022-10-21 | 住友ゴム工業株式会社 | 防舷材用ゴム組成物とそれを用いた防舷材 |
| JP7620847B2 (ja) | 2021-04-08 | 2025-01-24 | 住友ゴム工業株式会社 | 防舷材用ゴム組成物とそれを用いた防舷材 |
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| KR102807140B1 (ko) | 2022-11-28 | 2025-05-16 | 신성켐텍㈜ | 내오존성이 우수한 자동차용 스누버 방진고무 조성물 및 이로부터 제조되는 스누버 방진고무 성형체 |
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