Composition for vibration damper, process for manufacture thereof, and vibration damper
AssigneesMitsui Petrochemical Industries, Ltd., NEC Environment Engineering Ltd.
InventorsYohzoh Yamamoto, Shuichi Ishiwata, Kenji Yokoyama, Kimio Hasegawa
Life of this patent
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Abstract
A composition for a vibration damper, which comprises: 100 parts by weight of a resin-forming component comprising (a) a compound containing an epoxy group, and (b) a curing component comprising (i) a polyhydric phenol as a first curing compound and (ii) a second curing compound selected from the group consisting of an acid hydrazide, a urea derivative and an imidazole; 50 to 500 parts by weight of a scaly filler; 200 parts by weight or less of powdery filler; and 100 parts by weight or less of a fibrous filler. A process for the manufacture of the composition, and a vibration damper, also are disclosed.
Claims11
A composition for a vibration damper, which comprises:
- 100 parts by weight of a resin-forming component comprising (a) a compound containing an epoxy group and having an epoxy equivalent value of 50 to 2000,
- and (b) a curing component comprising (i) a polyhydric phenol as a first curing compound and (ii) a second curing compound selected from the group consisting of an acid hydrazide and a urea derivative;
- 50 to 500 parts by weight of a scaly filler;
- 200 parts by weight or less of a powdery filler;
- and
- 100 parts by weight or less of a fibrous filler, wherein the amount of the hydroxyl group of the polyhydric phenol is 0.6 to 1.3 equivalents per equivalent of the epoxy group of the epoxy group-containing compound, and the amuont of the second curing compound incorporated is 1 to 10 parts by weight per 100 parts by weight of the epoxy group-containing compound.
A process for the manufacture of a composition for a vibration damper, which comprises the steps of:
- mixing a resin-forming component comprising (a) a compound containing an epoxy group and having an epoxy equivalent value of 50 to 2000 with (i) a polyhydric phenol as a first curing compound of a curing component (b) under heating;
- cooling the mixture;
- adding (ii) a second curing compound of curing component (b) selected from the group consisting of an acid hydrazide and a urea derivative, a scaly filler, a powdery filler, and a fibrous filler to the cooled mixture;
- and
- mixing the total resultant mixture to thereby obtain a composition containing 50-500 parts by weight of the scaly filler, 200 parts by weight or less of the powdery filler and 100 parts by weight or less of the fibrous filler, with respect to 100 parts by weight of the resin-forming component comprising (a) the compound containing an epoxy group and (b) a curing component comprising (i) the first curing compound and (ii) the second curing compound, wherein the amount of the hydroxyl group of the polyhydric phenol is 0.6 to 1.3 equivalents per equivalent of the epoxy group of the epoxy group-containing compound, and the amount of the second curing compound incorporated is 1 to 10 parts by weight per 100 parts by weight of the epoxy group-containing compound.
A vibration damper comprising a heat-cured body of a resin-forming component comprising (a) a compound containing an epoxy group and having an epoxy equivalent value of 50 to 2000, and (b) a curing component comprising (i) a polyhydric phenol as a first curing compound and (ii) a second curing compound selected from the group consisting of an acid hydrazide and a urea derivative, and dispersed in the heat-cured body, 50 to 500 parts by weight of a scaly filler, 200 parts by weight or less of a powdery filler and 100 parts by weight or less of a fibrous filler, with respect to 100 parts by weight of the heat-cured body, wherein, the amount of the hydroxyl group of the polyhydric phenol is 0.6 to 1.3 equivalents per equivalent of the epoxy group of the epoxy group-containing compound, and the amount of the second curing compound incorporated is 1 to 10 parts by weight per 100 parts by weight of the epoxy group-containing compound.
Dependencies are inferred from the claim text.