Rubber composition and conveyor belt

Abstract

To provide a rubber composition and conveyor belt that exhibit excellent power saving properties at the operating ambient temperature, durability against deformation, ozone resistance, and flame retardancy after aging of the resulting vulcanized rubber. [Solution] A diene rubber containing natural rubber and butadiene rubber, a flame retardant, carbon black, sulfur, an anti-aging agent, and a vulcanization accelerator is provided, wherein in 100 parts by mass of the diene rubber, natural rubber is 20 to 70 parts by mass and butadiene rubber is 30 to 80 parts by mass, and the carbon black has a dibutyl phthalate oil absorption capacity of 100 ml / 100 g or more and less than 150 ml / 100 g, and a nitrogen adsorption specific surface area of ​​60 to 100 m². 2 Carbon black 1 at / g and nitrogen adsorption specific surface area of ​​20-50 m² 2 A rubber composition comprising carbon black 2 at a concentration of / g, wherein the mass ratio of the carbon black 1 content to the carbon black 2 content is 1.0 or more and less than 2.0, and the total content of carbon black 1 and carbon black 2 is 40 to 70 parts by mass per 100 parts by mass of diene rubber, and the vulcanization accelerator is a basic vulcanization accelerator comprising 0.1 to 1.0 parts by mass per 100 parts by mass of diene rubber.

Claims

1. It contains a diene rubber including natural rubber and butadiene rubber, a flame retardant, carbon black, sulfur, an anti-aging agent, and a vulcanization accelerator. In 100 parts by mass of the diene rubber, the content of natural rubber is 20 to 70 parts by mass, and the content of butadiene rubber is 30 to 80 parts by mass. The carbon black has a dibutyl phthalate oil absorption capacity of 100 ml / 100 g or more and less than 150 ml / 100 g, and a nitrogen adsorption specific surface area of ​​60 to 100 m². ２ Carbon black 1 at a concentration of / g, and nitrogen adsorption specific surface area of ​​20-50 m² ２ It contains carbon black 2 at a concentration of / g, The mass ratio of the carbon black 1 content to the carbon black 2 content is 1.0 or more and less than 2.0, The total content of carbon black 1 and carbon black 2 is 40 to 70 parts by mass per 100 parts by mass of the diene rubber. A rubber composition in which the vulcanization accelerator comprises a basic vulcanization accelerator, wherein the content of the basic vulcanization accelerator is 0.1 to 1.0 parts by mass per 100 parts by mass of the diene rubber.

2. The butadiene rubber has a cis-1,4 bond content of 97 mol% or more, and a Mooney viscosity (ML) at 100°C. １＋４ The rubber composition according to claim 1, wherein the ratio is 40 or more, and the viscosity (T-cp) of a 5% by mass toluene solution at 25°C is 100 cps or more.

3. The butadiene rubber has a Mooney viscosity (ML) at 100°C. １＋４ The rubber composition according to claim 2, wherein the ) is 45 or more, and the viscosity (T-cp) of a 5% by mass toluene solution at 25°C is 115 cps or more.

4. It further contains antimony trioxide, The aforementioned flame retardant contains chlorinated paraffin, The chlorinated paraffin content is 20 to 35 parts by mass per 100 parts by mass of the diene rubber. The rubber composition according to claim 1, wherein the antimony trioxide content is 5 to 12 parts by mass per 100 parts by mass of the diene rubber.

5. The rubber composition according to claim 4, wherein the average particle size of the antimony trioxide is 1.5 μm or less.

6. The rubber composition according to claim 1, for use in conveyor belts.

7. A conveyor belt manufactured using the rubber composition described in any one of claims 1 to 6.

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