Vibration damping rubber composition
View Patent ↗A vibration damping rubber composition having an excellent vibration damping performance includes the following (A) to (C) as essential components: (A) a diene-based rubber; (B) a vulcanizing agent of a bismaleimide compound represented by the following formula (1): [wherein X denotes a hydrocarbon group having an aromatic ring in its molecular structure or an aromatic hydrocarbon group and may or may not have a substituent; and R 1 to R 4 may be the same or different and each denote a hydrogen atom, an alkyl group, —NH 2 , or —NO 2 ], wherein the vulcanizing agent is sulfur-free; and (C) a vulcanization accelerator.
1. A vibration damping rubber composition comprising:
a diene-based rubber;
a vulcanizing agent of a bismaleimide compound selected from the group consisting of
N,N′(4,4,-diphenyl-methane) bismaleimide represented by the following chemical formula (3), bis (3-ethyl-5-methyl-4-maleimidephenyl)methane represented by the following chemical formula (4), 2,2′-bis [4-(4-maleimide phenoxy) phenyl]propane represented by the following chemical formula (5), m-phenylenebis(methylene) bismaleimide represented by the following chemical formula (6), and m-phenylenebis (methylene) biscitraconimide represented by the following chemical formula (7),
wherein the vulcanizing agent is sulfur-free; and
a vulcanization accelerator.
2. The vibration damping rubber composition according to claim 1 , wherein the vulcanization accelerator is a thiazole-based vulcanization accelerator.
3. The vibration damping rubber composition according to claim 2 , wherein the thiazole-based vulcanization accelerator is dibenzothiazyl disulfide or 2-(4-morpholinodithio)benzothiazole.
4. The vibration damping rubber composition according to claim 1 , wherein the vulcanization accelerator is thiuram-based vulcanization accelerator.
5. The vibration damping rubber composition according to claim 1 , wherein a thiazole-based vulcanization accelerator and a thiuram-based vulcanization accelerator are used in combination.
6. The vibration damping rubber composition according to claim 1 , wherein the diene-based rubber is at least one selected from a group consisting of natural rubbers, isoprene rubbers, butadiene rubbers, styrene-butadiene rubbers, and acrylonitride-butadien rubbers.