RUBBER COMPOSITION FOR CONVEYOR BELT AND CONVEYOR BELT

• US 20200131343A1
• Filed: 12/27/2017
• Published: 04/30/2020
• Est. Priority Date: 03/14/2017
• Status: Abandoned Application

• Current Assignee: Yokohama Rubber Company Limited
• Original Assignee: Yokohama Rubber Company Limited
• Inventors: ZOU, Deqing
• Application Number:
  US16/493,199
• Publication Number:
  US 20200131343A1
• Time in Patent Office: Days
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2413/00 Belts
• CPC Class Codes: B32B 25/00 Layered products comprising a layer of natural or synthetic rubber fibrous or filamentary layer made of a natural or synthetic rubber B32B5/02; particulate layer made of a natural or synthetic rubber B32B5/16; foamed layer made of a natural or synthetic rubber B32B5/18
• CPC Class Codes: B32B 25/04 comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/043; next to a bituminous or tarry layer B32B11/044; next to a water setting substance layer B32B13/042; next to a metal layer B32B15/06; next to a glass layer B32B17/063; next to a layer formed of natural mineral fibres or particles B32B19/043; next to a wood layer B32B21/045; next to a cellulosic plastic layer B32B23/046
• CPC Class Codes: B32B 25/12 comprising natural rubber
• CPC Class Codes: B32B 25/16 comprising polydienes homopolymers or poly-halodienes homopolymers B32B25/12 takes precedence
• CPC Class Codes: B65G 15/32 made of rubber or plastics
• CPC Class Codes: B65G 15/34 with reinforcing layers, e.g. of fabric
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/06 Sulfur
• CPC Class Codes: C08L 7/00 Compositions of natural rubber
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1386 Natural or synthetic rubber or rubber-like compound containing

Abstract

A rubber composition for a conveyor belt includes: a rubber component containing from 80 to 100% by mass of a natural rubber and from 0 to 20% by mass of a butadiene rubber; carbon black; sulfur; and a vulcanization accelerator, in which a content of the carbon black is from 45 to 100 parts by mass with respect to 100 parts by mass of the rubber component, a content of the sulfur is from 0.50 to 2.00 parts by mass with respect to 100 parts by mass of the rubber component, a content of the vulcanization accelerator is 1.50 parts by mass or less with respect to 100 parts by mass of the rubber component, and a mass ratio of the vulcanization accelerator to the sulfur is from 0.50 to 3.00. A conveyor belt includes an upper surface cover rubber layer formed of the rubber composition for a conveyor belt.

Claims

1. A rubber composition for a conveyor belt comprising:

a rubber component containing from 80 to 100% by mass of a natural rubber and from 0 to 20% by mass of a butadiene rubber;

carbon black;

sulfur; and

a vulcanization accelerator,

wherein a content of the carbon black is from 45 to 100 parts by mass with respect to 100 parts by mass of the rubber component;

a content of the sulfur is from 0.50 to 2.00 parts by mass with respect to 100 parts by mass of the rubber component;

a content of the vulcanization accelerator is 1.50 parts by mass or less with respect to 100 parts by mass of the rubber component; and

a mass ratio of the vulcanization accelerator to the sulfur is from 0.50 to 3.00.

2. The rubber composition for a conveyor belt according to claim 1,

wherein a nitrogen adsorption specific surface area of the carbon black is from 115 to 160 m²/g, and

a dibutyl phthalate oil absorption amount of the carbon black is from 115 to 140 mL/100 g.

3. The rubber composition for a conveyor belt according to claim 1,

wherein the rubber component contains a natural rubber and a butadiene rubber,

a content of the natural rubber is more than 80% by mass and 95% by mass or less with respect to a total amount of the rubber component, and

a content of the butadiene rubber is 5% by mass or more and less than 20% by mass with respect to the total amount of the rubber component.

4. The rubber composition for a conveyor belt according to claim 1, wherein a content of the carbon black is more than 50 parts by mass and 80 parts by mass or less with respect to 100 parts by mass of the rubber component.

5. The rubber composition for a conveyor belt according to claim 1, wherein a content of the sulfur is 0.50 parts by mass or more and less than 2.00 parts by mass with respect to 100 parts by mass of the rubber component.

6. A conveyor belt comprising:

an upper surface cover rubber layer formed of the rubber composition for a conveyor belt described in claim 1;

a reinforcing layer; and

a lower surface cover rubber layer.

7. The rubber composition for a conveyor belt according to claim 2,

wherein the rubber component contains a natural rubber and a butadiene rubber,

a content of the natural rubber is more than 80% by mass and 95% by mass or less with respect to a total amount of the rubber component, and

a content of the butadiene rubber is 5% by mass or more and less than 20% by mass with respect to the total amount of the rubber component.

8. The rubber composition for a conveyor belt according to claim 2, wherein a content of the carbon black is more than 50 parts by mass and 80 parts by mass or less with respect to 100 parts by mass of the rubber component.

9. The rubber composition for a conveyor belt according to claim 2, wherein a content of the sulfur is 0.50 parts by mass or more and less than 2.00 parts by mass with respect to 100 parts by mass of the rubber component.

10. The rubber composition for a conveyor belt according to claim 3, wherein a content of the carbon black is more than 50 parts by mass and 80 parts by mass or less with respect to 100 parts by mass of the rubber component.

11. The rubber composition for a conveyor belt according to claim 3, wherein a content of the sulfur is 0.50 parts by mass or more and less than 2.00 parts by mass with respect to 100 parts by mass of the rubber component.

12. The rubber composition for a conveyor belt according to claim 4, wherein a content of the sulfur is 0.50 parts by mass or more and less than 2.00 parts by mass with respect to 100 parts by mass of the rubber component.