Rubber composition for pneumatic tires for construction vehicles
View Patent ↗The present technology provides a rubber composition containing: from 20 to 40 parts by weight of carbon black, from 15 to 30 parts by weight of silica, from 2.0 to 3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent, per 100 parts by weight of diene rubber that contains from 80 to 100 wt. % of natural rubber, and from 20 to 0 wt. % of isoprene rubber; the total amount of sulfur in the sulfur and the sulfur-containing silane coupling agent being from 2.3 to 4.0 parts by weight.
1. A rubber composition for pneumatic tires for construction vehicles, the rubber composition comprising: from 20 to 40 parts by weight of carbon black, from 15 to 30 parts by weight of silica, from 2.0 to 3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent, per 100 parts by weight of diene rubber that contains natural rubber in an amount of from 80 wt. % to 95 wt. % and isoprene rubber in an amount of from 5 wt. % to 20 wt. %; a total amount of the sulfur in the sulfur and the sulfur-containing silane coupling agent being from 2.4 to 4.0 parts by weight.
2. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , comprising from 90 wt. % to 95 wt. % of the natural rubber per 100 parts by weight of the diene rubber.
3. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , comprising from 10 wt. % to 5 wt. % of isoprene rubber per 100 parts by weight of the diene rubber.
4. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , comprising from 20 to 35 parts by weight of the carbon black.
5. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein the carbon black has a nitrogen adsorption specific surface area of from 70 to 145 m 2 /g.
6. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein the carbon black has a nitrogen adsorption specific surface area of from 85 to 125 m 2 /g.
7. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , comprising from 20 to 28 parts by weight of the silica.
8. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein a total amount of the carbon black and the silica is from 45 to 70 parts by weight per 100 parts by weight of diene rubber.
9. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein a total amount of the carbon black and the silica is from 50 to 65 parts by weight per 100 parts by weight of diene rubber.
10. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein a nitrogen adsorption specific surface area of the silica is from 110 to 200 m 2 /g.
11. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein a nitrogen adsorption specific surface area of the silica is from 150 to 180 m 2 /g.
12. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein the sulfur-containing silane coupling agent is selected from bis-(3-triethoxysilylpropyl)tetrasulfide, bis(3-triethoxysilylpropyl)disulfide, 3-trimethoxysilylpropylbenzothiazol tetrasulfide, γ-mercaptopropyltriethoxysilane, or 3-octanoylthiopropyltriethoxysilane.
13. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , wherein the sulfur-containing silane coupling agent is selected from bis-(3-triethoxysilylpropyl)tetrasulfide or bis(3-triethoxysilylpropyl) disulfide.
14. The rubber composition for pneumatic tires for construction vehicles according to claim 1 , comprising from 2.5 to 3.0 parts by weight of the sulfur per 100 parts by weight of diene rubber.
15. A pneumatic tire for construction vehicles comprising a tread portion formed by laminating rubber sheets having any width formed from the rubber composition for pneumatic tires for construction vehicles described in claim 1 .