High rigidity rubber material

摘要

The present invention relates to a rubber material containing an EPDM rubber composition containing an EPDM rubber, a carbon black, a softening agent, a vulcanizing agent and a sulfur compound, in which a blending amount of whole components from which the vulcanizing agent and the sulfur compound are excluded is from 300 to 400 parts by weight, and a total sulfur blending amount is from 1.0 to 2.8 parts by weight, in which a blending ratio of carbon black/softening agent is from 1.8 to 2.5, and in which the EPDM rubber composition has a Mooney viscosity of from 70 to 100 at 100° C., and a vulcanized composition thereof has a rate of rigidity change satisfying the following equation (1):
{(30% Modulus at 100° C./30% modulus at 23° C.)−1}×100%≧−10%  (1).

主权项

1. A rubber hose material made of an EPDM rubber composition, the EPDM rubber composition consisting essentially of:
100 parts by weight of an EPDM rubber blended together with: 135 to 180 parts by weight carbon black; 55 to 100 parts by weight a softening agent; a blending ratio of carbon black/softening agent being from 1.8 to 2.5; 0.4 to 1.5 parts by weight of powdered sulfur as a vulcanizing agent; 0.4 to 0.9 parts by weight of sulfur contained within a sulfur compound selected from the group consisting of sulfur compounds that release sulfur at the time of vulcanization; 1.0 to 1.7 parts by weight of a total sulfur blending amount, the total sulfur blending amount including the weight of the powdered sulfur and the weight of the sulfur contained within the sulfur compound; and a blending amount of all components of the EPDM rubber composition from which the powdered sulfur as a vulcanizing agent and the sulfur compound are excluded is from 300 to 400 parts by weight, wherein the EPDM rubber composition has a Mooney viscosity of 100 at 100° C., and a vulcanized composition thereof has a rate of rigidity change satisfying the following equation (1):
{(30% Modulus at 100° C./30% modulus at 23° C.)−1}×100%≧−10%  (1).