RUBBER COMPOSITION FOR VIBRATION-PROOF RUBBER AND VIBRATION-PROOF RUBBER

PROBLEM TO BE SOLVED: To provide a rubber composition for vibration-proof rubber and a vibration-proof rubber capable of achieving both high durability and low dynamic magnification.SOLUTION: There is provided a rubber composition for vibration-proof rubber which comprises 2 to 10 pts.wt. of composite zinc white based on 100 pts.wt. of a rubber component containing 60 to 95 pts.wt. of at least one selected from the group consisting of a natural rubber and a polyisoprene rubber and 5 to 30 pts.wt. of a styrene-butadiene rubber. The composite zinc white is obtained by coating a core such as CaCohaving a core diameter as small as possible with zinc oxide and has a nitrogen adsorption specific surface area of 15 to 110 m/g, a DBP oil absorption of 50 to 100 ml/100 g and a zinc oxide concentration of 38 to 64 wt.%. 【課題】高耐久性および低動倍率性の両立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。【解決手段】天然ゴムおよびポリイソプレンゴムからなる群より選択される少なくとも１種６０〜９５重量部ならびにスチレンブタジエンゴム５〜３０重量部を含むゴム成分１００重量部に対し、複合亜鉛華を２〜１０重量部含有し、該複合亜鉛華が、できるだけ小さなｃｏｒｅ径を有するＣａＣｏ３などのｃｏｒｅに亜鉛華を被覆したものであって、窒素吸着比表面積が１５〜１１０ｍ２／ｇ、ＤＢＰ吸油量が５０〜１００ｍｌ／１００ｇ、かつ亜鉛華濃度が３８〜６４重量％である防振ゴム用ゴム組成物。【選択図】 なし