The invention discloses a rubber compound for a T4-grade heat-resistant
conveyor belt covering layer and a preparation method of the rubber compound, and belongs to the technical field of heat-resistant conveyor belts. The rubber compound is prepared from
ethylene propylene rubber, polyisobutene, an active flowable agent, an anti-aging agent, a reinforcing agent, a
plasticizer, a heat-resistant reinforcing agent, a vulcanizing agent, an assistant crosslinker and the like. The main body base material adopts low Mooney / medium-high
ethylene content and high Mooney / high
ethylene content ethylene-propylene rubber, and the molecular chain of the base material is completely saturated; an active
lubricant zinc laurate is added to reduce the
Mooney viscosity of the rubber compound and improve the processability, and polyisobutene is added to further reduce the
Mooney viscosity of the rubber compound and improve the autohension of the rubber compound; the anti-aging agent RD, the anti-aging agent MB and the anti-aging agent GS are combined according to a certain proportion, and through synergistic cooperation, the protection effect is excellent.