Rubber composition for heat-resistant conveyor belts and heat-resistant conveyor belt
View Patent ↗A rubber composition for heat-resistant conveyor belts contains an ethylene-1-butene copolymer having a Mooney viscosity at 125° C. of 20 or greater, and an ethylene-propylene copolymer having a Mooney viscosity at 125° C. of 20 or greater and an ethylene content of 40 to 60 mass %, and the mass ratio of the ethylene-1-butene copolymer to the ethylene-propylene copolymer is 10/90 to 90/10.
1. A rubber composition for heat-resistant conveyor belts comprising:
an ethylene-1-butene copolymer having a Mooney viscosity at 125° C. of 20 or greater; and
an ethylene-propylene copolymer having a Mooney viscosity at 125° C. of 20 or greater and an ethylene content of 40 to 55 mass %,
wherein a mass ratio of the ethylene-1-butene copolymer to the ethylene-propylene copolymer is 10/90 to 90/10.
2. The rubber composition for heat-resistant conveyor belts according to claim 1 , wherein a Mooney viscosity at 125° C. of the ethylene-1-butene copolymer is 30 or greater.
3. The rubber composition for heat-resistant conveyor belts according to claim 1 , wherein an ethylene content of the ethylene-propylene copolymer is 40 mass % or greater and less than 60 mass %.
4. The rubber composition for heat-resistant conveyor belts according to claim 1 , further comprising an organic peroxide, wherein a content of the organic peroxide is from 0.011 to 0.020 molar equivalents relative to 100 parts by mass of the total of the ethylene-1-butene copolymer and the ethylene-propylene copolymer.
5. A heat-resistant conveyor belt comprising the rubber composition for heat-resistant conveyor belts according to claim 1 .
6. The rubber composition for heat-resistant conveyor belts according to claim 2 , wherein an ethylene content of the ethylene-propylene copolymer is 40 mass % or greater and less than 60 mass %.
7. The rubber composition for heat-resistant conveyor belts according to claim 6 , further comprising an organic peroxide, wherein a content of the organic peroxide is from 0.011 to 0.020 molar equivalents relative to 100 parts by mass of the total of the ethylene-1-butene copolymer and the ethylene-propylene copolymer.
8. The rubber composition for heat-resistant conveyor belts according to claim 2 , further comprising an organic peroxide, wherein a content of the organic peroxide is from 0.011 to 0.020 molar equivalents relative to 100 parts by mass of the total of the ethylene-1-butene copolymer and the ethylene-propylene copolymer.
9. The rubber composition for heat-resistant conveyor belts according to claim 3 , further comprising an organic peroxide, wherein a content of the organic peroxide is from 0.011 to 0.020 molar equivalents relative to 100 parts by mass of the total of the ethylene-1-butene copolymer and the ethylene-propylene copolymer.