Rubber composition for anti-vibration rubber and an anti-vibration rubber
The present invention provides a rubber composition for anti-vibration rubber which can achieve a balance of a low dynamic magnification and a high dampening property when it is made into an anti-vibration rubber, as well as provides an anti-vibration rubber obtained from the rubber composition for anti-vibration rubber as a raw material. The object can be solved by a rubber composition for anti-vibration rubber, including: when a rubber component included in the rubber composition is assumed to be 100 parts by mass, 10 to 30 parts by mass of a polystyrene butadiene rubber; and 40 to 00 parts by mass of at least one kind selected from the group consisting of a natural rubber and a polyisoprene rubber. It is preferable to provide an anti-vibration rubber formed through vulcanization of the rubber composition for anti-vibration rubber, and that it has a peak of tan δ at 10° C. or more.
1. A rubber composition for anti-vibration rubber, wherein a rubber component included in the rubber composition consists of:
15 to 25 parts by mass of a polystyrene butadiene rubber; and
75 to 85 parts by mass of at least one kind selected from the group consisting of a natural rubber and a polyisoprene rubber,
wherein the polystyrene butadiene rubber has a glass transition temperature of −15 to 20° C.,
wherein the polystyrene butadiene rubber has a mass average molecular weight of 1,000,000 or more.
2. The rubber composition for anti-vibration rubber according to claim 1 , comprising:
100 parts by mass of the rubber component;
20 to 40 parts by mass of silica; and
5 to 15 parts by mass of carbon black.
3. An anti-vibration rubber which is formed in shape through vulcanization of the rubber composition for anti-vibration rubber according to claim 1 .
4. The anti-vibration rubber according to claim 3 , having a peak of tan δ in a temperature range of 10° C. or more.