2-Mercaptobenzothiazole (MBT), also known as MBT (M), is a versatile and widely used chemical compound in the rubber industry, primarily as an accelerator and vulcanization agent. This article provides a comprehensive overview of its chemical properties, applications, and safety considerations.

Chemical Properties

MBT (M) is a white to off-white crystalline powder with a melting point of 168-170°C and a boiling point of 280°C. It is slightly soluble in water but readily soluble in organic solvents such as benzene, acetone, and toluene. Its chemical structure consists of a benzothiazole ring with a mercapto group, providing it with unique reactivity and stability.

Performance

Vulcanization Agent: MBT (M) is a primary accelerator used in the vulcanization of natural rubber (NR) and synthetic rubbers such as styrene-butadiene rubber (SBR) and nitrile rubber (NBR).

Delayed Action: It exhibits delayed action, which helps in preventing premature vulcanization during processing.

Compatibility: MBT (M) is compatible with a wide range of rubber types and can be used in combination with other accelerators to achieve desired vulcanization properties.

Applications

Tires: MBT (M) is widely used in tire manufacturing, particularly in tire treads and sidewalls, to improve static ozone resistance and flexural fatigue resistance.

Rubber Products: It is used in various rubber products such as hoses, belts, and seals to enhance their durability and resistance to environmental factors.

Adhesives and Sealants: MBT (M) is used to improve the stability and performance of adhesives and sealants, ensuring long-term durability and resistance to environmental factors.

Packaging and Storage

MBT (M) is typically packaged in 25 kg paper bags lined with plastic film or in kraft paper bags. It should be stored in a cool, dry place with good ventilation, avoiding direct sunlight and moisture. The product has a shelf life of one year when stored properly.

Safety and Handling

MBT (M) is classified as a hazardous substance with the following hazard statements:

H302: Harmful if swallowed.

H315: Causes skin irritation.

H319: Causes serious eye irritation.

Precautionary Statements:

P261: Avoid breathing dust/fume/gas/mist/vapors/spray.

P280: Wear protective gloves/protective clothing/eye protection/face protection.

P305 + P351 + P338: If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.

P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.

Conclusion

2-Mercaptobenzothiazole (MBT) is a versatile and high-performance chemical compound with a wide range of applications in the rubber industry. Its improved properties, such as delayed action and high anti-scorching quality, make it particularly suitable for products requiring high performance and durability. Proper handling and storage are essential to ensure its safe and effective use.