Vibration-damping rubber composition, crosslinked vibration-damping rubber composition, and vibration-damping rubber
View Patent ↗Provided is a vibration-insulating rubber composition and a crosslinked vibration-insulating rubber composition which successfully maintain basic physical properties and thermal resistance while being excellent in weather resistance and crack growth resistance, and a vibration-insulating rubber using the vibration-insulating rubber composition and the crosslinked vibration-insulating rubber composition. The vibration-insulating rubber composition of the present invention includes: a rubber component having a conjugated diene compound/non-conjugated olefin copolymer; sulfur by 0.6 parts by mass or less per 100 parts by mass of the rubber component; and a bismaleimide compound by 1 to 5 parts by mass per 100 parts by mass of the rubber component.
1. A vibration-insulating rubber composition, comprising:
a rubber component having a conjugated diene compound/non-conjugated olefin copolymer;
sulfur by 0.6 parts by mass or less per 100 parts by mass of the rubber component; and
a bismaleimide compound by 1 to 5 parts by mass per 100 parts by mass of the rubber component, wherein an amount of cis-1,4 bonds in the moiety derived from the conjugated diene compound is more than 92%.
2. The vibration-insulating rubber composition according to claim 1 , wherein the rubber component contains a conjugated diene-based polymer.
3. The vibration-insulating rubber composition according to claim 2 , wherein the conjugated diene-based polymer has natural rubber.
4. The vibration-insulating rubber composition according to claim 1 , wherein the conjugated diene compound/non-conjugated olefin copolymer contains a moiety derived from a conjugated diene compound by 30 mol % to 80 mol %.
5. The vibration-insulating rubber composition according to claim 1 , wherein the conjugated diene compound/non-conjugated olefin copolymer has a polystyrene equivalent weight-average molecular weight of 10,000 to 10,000,000.
6. The vibration-insulating rubber composition according to claim 1 , wherein the conjugated diene compound/non-conjugated olefin copolymer has a molecular weight distribution (Mw/Mn) of 10 or less.
7. The vibration-insulating rubber composition according to claim 1 , wherein the conjugated diene compound/non-conjugated olefin copolymer is contained by 10 to 100 parts by mass per 100 parts by mass of the rubber component.
8. The vibration-insulating rubber composition according to claim 1 , wherein the non-conjugated olefin is acyclic olefin.
9. The vibration-insulating rubber composition according to claim 8 , wherein the non-conjugated olefin is at least one selected from a group consisting of ethylene, propylene, and 1-butene.
10. The vibration-insulating rubber composition according to claim 9 , wherein the non-conjugated olefin is ethylene.
11. The vibration-insulating rubber composition according to claim 1 , wherein the non-conjugated olefin has 2 to 10 carbon atoms.
12. The vibration-insulating rubber composition according to claim 1 , wherein the conjugated diene compound/non-conjugated olefin copolymer is block copolymer.
13. The vibration-insulating rubber composition according to claim 1 , wherein the conjugated diene compound/non-conjugated olefin copolymer is butadiene/ethylene block copolymer.
14. A crosslinked vibration-insulating rubber composition obtained by cros slinking the vibration-insulating rubber composition according to claim 1 .
15. A vibration-insulating rubber product comprising the vibration-insulating rubber composition according to claim 1 .