RUBBER COMPOSITION AND CONVEYOR BELT

• Main Author: ABE MEGUMI
• Format: Patent
• Language: English; Japanese
• Published: 16.02.2024
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide a rubber composition which, when formed into a vulcanized rubber, has excellent flame retardant performance and can maintain the excellent power-saving performance possessed by a vulcanized rubber obtained from a rubber composition to which no flame retardant is added even if a flame retardant is added and to provide a conveyor belt.SOLUTION: There is provided a rubber composition which comprises a diene-based rubber containing a natural rubber and a butadiene rubber, carbon black having a nitrogen adsorption specific surface area of 20 to 100 m2/g and a dibutyl phthalate oil absorption amount of 70 to 120 cm3/100 g, a flame retardant containing a compound represented by a specific formula and antimony trioxide, sulfur and a vulcanization accelerator, wherein the mass ratio of the natural rubber to the butadiene rubber is 40/60 to 80/20, the content of the carbon black is 20 to 50 pts.mass based on 100 pts.mass of the diene-based rubber and the total content of the compound represented by the specific formula and antimony trioxide is 15 to 50 pts.mass based on 100 pts.mass of the diene-based rubber.SELECTED DRAWING: None 【課題】加硫ゴムとしたときに、難燃性能が優れ、難燃剤を添加しても難燃剤を添加しないゴム組成物から得られる加硫ゴムが有する優れた省電力性能を維持できるゴム組成物、及び、コンベヤベルトの提供。【解決手段】天然ゴムとブタジエンゴムとを含むジエン系ゴム、窒素吸着比表面積が２０～１００ｍ２／ｇであり、かつ、ジブチルフタレート吸油量が７０～１２０ｃｍ３／１００ｇであるカーボンブラック、特定の式で表される化合物と三酸化アンチモンとを含む難燃剤、硫黄、及び、加硫促進剤を含有し、天然ゴムのブタジエンゴムに対する質量比が４０／６０～８０／２０であり、上記カーボンブラックの含有量がジエン系ゴム１００質量部に対して２０～５０質量部であり、特定の式で表される化合物と三酸化アンチモンとの合計含有量がジエン系ゴム１００質量部に対して、１５～５０質量部である、ゴム組成物、並びに、これを用いて形成されたコンベヤベルト。【選択図】なし