In the realm of rubber chemistry, vulcanization is the transformative process that imbues raw rubber with its desirable strength, elasticity, and durability. At the heart of efficient and controlled vulcanization lies the role of accelerators, and among these, N-Cyclohexyl-2-benzothiazolesulfenamide (CBS), also known by its CAS number 95-33-0, holds a prominent position. This article explores the chemical characteristics and indispensable functions of CBS in modern rubber manufacturing.

Chemical Identity and Properties of CBS (CAS 95-33-0)

N-Cyclohexyl-2-benzothiazolesulfenamide is a organic compound belonging to the sulfenamide class of rubber accelerators. Its molecular formula is C13H16N2S2, and it typically presents as an off-white or light yellow powder or granule. Key properties relevant to its industrial application include:

  • Melting Point: Generally above 92.0°C, indicating good thermal stability during handling and mixing.
  • Solubility: Soluble in organic solvents like benzene, dichloromethane, and acetone, but insoluble in water. This influences its dispersion characteristics within rubber matrices.
  • Specific Gravity: Approximately 1.27-1.30, which is important for formulation calculations.

These properties, combined with its chemical structure, enable CBS to interact effectively with sulfur and rubber polymers during the vulcanization process, facilitating the formation of cross-links.

Mechanism and Benefits in Vulcanization

CBS functions as a delayed-action accelerator. This means that it provides a crucial delay in the onset of vulcanization, allowing rubber compounders ample time for processing without premature curing. This 'scorch safety' is a critical advantage, especially in complex manufacturing operations. Once the processing temperature is reached, CBS efficiently promotes the formation of sulfur cross-links between polymer chains. This process significantly enhances the mechanical properties of the rubber, including tensile strength, modulus, and abrasion resistance, while contributing to excellent aging properties.

Compared to earlier accelerators, sulfenamides like CBS offer a superior balance of processing safety and cure speed. They are particularly effective in natural rubber, synthetic rubbers like SBR (Styrene-Butadiene Rubber), butadiene rubber, and isoprene rubber. Their effectiveness is often amplified when used in conjunction with secondary accelerators, such as DT (Diphenylguanidine) or TT (Thiuram Tetrasulfide), allowing for fine-tuning of the vulcanization profile.

Importance for Manufacturers and Buyers

For manufacturers producing tires, hoses, belts, cables, and various other industrial rubber goods, the reliable performance of Accelerator CZ is non-negotiable. A consistent supply of high-purity N-Cyclohexyl-2-benzothiazolesulfenamide ensures predictable processing and high-quality end products. This drives demand for manufacturers and suppliers who can guarantee adherence to strict quality control measures.

When procurement managers or R&D scientists are looking to buy CBS, they seek suppliers who can provide not just the chemical, but also the technical data and assurance of quality. Understanding the chemical behavior of CAS 95-33-0 allows them to optimize formulations and production processes. Therefore, partnering with reputable N-Cyclohexyl-2-benzothiazolesulfenamide manufacturers and suppliers, particularly those offering competitive prices and robust technical support, is a strategic imperative for any rubber product business aiming for excellence.