Rubber composition for conveyor belt, and conveyor belt

Patent metadata

Field	Value
Publication number	US-9403643-B2
Application number	US-201414784861-A
Country	US
Kind code	B2
Filing date	Apr 8, 2014
Priority date	Apr 15, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

The present technology provides a rubber composition for a conveyor belt. The rubber composition comprises: a rubber component containing butadiene rubber and/or styrene butadiene rubber, carbon black, sulfur, and a vulcanization accelerator; the glass transition temperature of the butadiene rubber and the styrene butadiene rubber being −65° C. or lower; the nitrogen adsorption specific surface area of the carbon black being 90 m 2 /g or less; the total content of the butadiene rubber and the styrene butadiene rubber being 50% by mass or greater relative to the content of the rubber component; the content of the carbon black being from 30 to 50 parts by mass per 100 parts by mass of the rubber component; and the mass ratio (sulfur/vulcanization accelerator) of the content of the sulfur to the content of the vulcanization accelerator being 1.5 or less.

First claim

What is claimed is:

1. A rubber composition for a conveyor belt comprising:
a rubber component containing butadiene rubber and/or styrene butadiene rubber, carbon black, sulfur, and a vulcanization accelerator;
a glass transition temperature of the butadiene rubber and the styrene butadiene rubber being −65° C. or lower;
a nitrogen adsorption specific surface area of the carbon black being 90 m 2 /g or less;
a total content of the butadiene rubber and the styrene butadiene rubber being 50% by mass or greater relative to a content of the rubber component;
a content of the carbon black being from 30 to 50 parts by mass per 100 parts by mass of the rubber component; and
a mass ratio (sulfur/vulcanization accelerator) of a content of the sulfur to a content of the vulcanization accelerator being 1.5 or less.

2. The rubber composition for a conveyor belt according to claim 1 , wherein the nitrogen adsorption specific surface area of the carbon black is 60 m 2 /g or greater.

3. The rubber composition for a conveyor belt according to claim 1 , wherein the rubber composition is used in a conveyor belt for use in cold regions.

4. A conveyor belt formed by using the rubber composition for a conveyor belt described in claim 1 .

5. A conveyor belt comprising:
an upper cover rubber layer, a reinforcing layer, and a lower cover rubber layer;
at least the lower cover rubber layer being formed by using the rubber composition for a conveyor belt described in claim 1 .

6. The conveyor belt according to claim 4 , wherein the conveyor belt is for use in cold regions.

7. The rubber composition for a conveyor belt according to claim 2 , wherein the rubber composition is used in a conveyor belt for use in cold regions.

8. A conveyor belt formed by using the rubber composition for a conveyor belt described in claim 2 .

9. A conveyor belt formed by using the rubber composition for a conveyor belt described in claim 3 .

10. A conveyor belt formed by using the rubber composition for a conveyor belt described in claim 7 .

11. A conveyor belt comprising:
an upper cover rubber layer, a reinforcing layer, and a lower cover rubber layer;
at least the lower cover rubber layer being formed by using the rubber composition for a conveyor belt described in claim 2 .

12. A conveyor belt comprising:
an upper cover rubber layer, a reinforcing layer, and a lower cover rubber layer;
at least the lower cover rubber layer being formed by using the rubber composition for a conveyor belt described in claim 3 .

13. A conveyor belt comprising:
an upper cover rubber layer, a reinforcing layer, and a lower cover rubber layer;
at least the lower cover rubber layer being formed by using the rubber composition for a conveyor belt described in claim 7 .

14. The conveyor belt according to claim 5 , wherein the conveyor belt is for use in cold regions.

15. The conveyor belt according to claim 8 , wherein the conveyor belt is for use in cold regions.

16. The conveyor belt according to claim 9 , wherein the conveyor belt is for use in cold regions.

17. The conveyor belt according to claim 10 , wherein the conveyor belt is for use in cold regions.

18. The conveyor belt according to claim 11 , wherein the conveyor belt is for use in cold regions.

19. The conveyor belt according to claim 12 , wherein the conveyor belt is for use in cold regions.

20. The conveyor belt according to claim 13 , wherein the conveyor belt is for use in cold regions.

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Sasakuma Hidehiro
• Suefuji Ryotaro
• Miyajima Atsushi
• Hou Gang

Classifications

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• B65G15/34 Primary

  with reinforcing layers, e.g. of fabric · CPC title

• B65G15/32 Primary

  made of rubber or plastics · CPC title

• C08K3/04

  Carbon · CPC title

• C08K3/012

  Additives activating the degradation of the macromolecular compounds · CPC title