Sodium mercaptobenzothiazole, CAS number 2492-26-4, abbreviated as SMBT, has the molecular formula C7H4NNaS2. Sodium Mercaptobenzothiazole SMBT usually appears as a light yellow to brown powder or granules, is highly soluble in water, and has unique chemical activity. The functional groups such as thiol groups (-SH) and thiazole rings contained in its molecular structure endow it with excellent complexation, antioxidant and vulcanization promotion properties, making it play an irreplaceable role in multiple fields such as the rubber industry, metal processing, water treatment, and pharmaceutical and chemical industries. Sodium Mercaptobenzothiazole SMBT is an important product with both functionality and practicality in the field of fine chemicals.
Sodium mercaptobenzothiazole solubility is good in water and alkaline solution, slightly soluble in organic solvents, sodium mercaptobenzothiazole uses mainly include rubber vulcanization accelerator, metal corrosion inhibitor and intermediate in chemical synthesis.
I. Rubber Industry – Core Component of High-Efficiency vulcanization accelerators
In the rubber industry, sodium mercaptobenzothiazole is a key raw material for vulcanization accelerators, especially suitable for the vulcanization processing of general synthetic rubbers such as natural rubber, styrene-butadiene rubber and nitrile rubber. Rubber vulcanization is a key process in which linear rubber molecules form a three-dimensional network structure through cross-linking reactions, thereby enhancing the strength, elasticity, wear resistance and heat resistance of rubber products. Sodium mercaptobenzothiazole, with its highly efficient catalytic effect on vulcanization reactions, has become a core additive in this process.
Compared with traditional accelerators, the accelerator system based on sodium mercaptobenzothiazole has advantages such as fast vulcanization speed, uniform crosslinking density and low dosage. Sodium mercaptobenzothiazole can effectively lower the vulcanization temperature, shorten the vulcanization time, significantly enhance production efficiency, and at the same time improve the mechanical properties of rubber products, making it widely used in the production of rubber products such as tires, seals, rubber hoses, and rubber belts. In addition, it can also be compounded with other accelerators (such as sulfenamides and guanidins) for use. The formula can be adjusted according to the performance requirements of different rubber products to further optimize the vulcanization effect and meet the quality requirements of high-end rubber products.
II. Metalworking – High-performance Corrosion Inhibitors and Complexing reagents
The thiol and nitrogen atoms in the sodium mercaptobenzothiazole molecule have strong coordination ability and can form stable complexes with various metal ions (such as copper, iron, zinc, etc.). This characteristic makes it exhibit excellent corrosion inhibition and metal ion sealing performance in the field of metal processing.
In terms of metal rust prevention and corrosion inhibition, SMBT is often added to products such as metal cutting fluids, rust preventive oils, and antifreeze. When in contact with the metal surface, sodium mercaptobenzothiazole can quickly adsorb and form a dense protective film, isolating corrosive media such as oxygen and moisture from the metal surface, thereby effectively inhibiting the oxidation corrosion and electrochemical corrosion of the metal, and extending the service life and storage period of metal workpieces. Especially in the processing and protection of copper and copper alloys, its corrosion inhibition effect is particularly remarkable, which can prevent copper materials from oxidation, discoloration, spots and other corrosion phenomena. SMBT is widely used in the protection of copper parts in electronic components and precision instruments.
Meanwhile, in the electroplating industry, sodium mercaptobenzothiazole can be used as a complexing agent and a leveling agent. Sodium mercaptobenzothiazole uses can form stable complexes with metal ions in the electroplating solution, regulate the deposition rate of metal ions, make the coating more uniform, dense and bright, improve the appearance quality and adhesion of electroplated products, and are suitable for various electroplating processes such as decorative electroplating and functional electroplating.
III. Water Treatment – High-Efficiency Metal Ion Chelating Agent
In the field of industrial water treatment, sodium mercaptobenzothiazole is an efficient metal ion chelating agent, mainly used for treating industrial wastewater containing heavy metal ions. Wastewater discharged from industrial production (such as electroplating, metallurgy, chemical engineering and other industries) often contains heavy metal ions such as copper, lead, mercury and cadmium. These ions are characterized by high toxicity, difficulty in degradation and easy accumulation, posing a great threat to the environment and human health.
Sodium mercaptobenzothiazole can undergo chelation reactions with heavy metal ions in wastewater, forming insoluble chelate precipitates. Through subsequent sedimentation, filtration and other processes, heavy metal ions can be effectively removed from the wastewater, achieving the purpose of wastewater purification. Compared with traditional heavy metal removers, it has advantages such as strong chelating ability, fast reaction speed, and wide applicable pH range. Sodium Mercaptobenzothiazole SMBT can efficiently remove various heavy metal ions under a wide pH range. The treated wastewater can meet national discharge standards. Meanwhile, the chelate after precipitation is highly stable and less likely to redissolve and cause secondary pollution. It is one of the ideal chemicals for the treatment of heavy metals in industrial wastewater.
IV. Intermediates for pharmaceuticals and fine chemicals
In the field of pharmaceutical and chemical engineering, sodium mercaptobenzothiazole can be used as an important organic synthesis intermediate to synthesize a variety of biologically active compounds. The thiol and thiazole rings in its molecular structure are key functional groups for many drug molecules. Through further substitution, addition and other reactions, various drug intermediates such as antibacterial drugs, anti-inflammatory drugs and anti-tumor drugs can be synthesized, providing basic raw materials for pharmaceutical research and development and production.
In addition, in other fine chemical fields, sodium mercaptobenzothiazole can also be used to synthesize dyes, pigments, fragrances and other products. With its unique chemical activity, sodium mercaptobenzothiazole provides assistance for the performance optimization of these products and further expands its application scope.
V. Precautions for Use
Although sodium mercaptobenzothiazole has a wide range of uses, safety precautions should still be taken during its application. Sodium Mercaptobenzothiazole SMBT has a certain degree of irritation. Operators need to wear protective equipment (such as masks, gloves, protective suits, etc.) to avoid direct contact with the skin and respiratory tract. When storing, it should be sealed and kept in a dry, well-ventilated and cool environment, away from fire sources, oxidants and acidic substances to prevent decomposition or chemical reactions. Meanwhile, in different application fields, the dosage and usage conditions should be controlled according to specific process requirements to ensure the application effect and safety.
In conclusion, sodium mercaptobenzothiazole (CAS 2492-26-4) has demonstrated significant application value in multiple fields such as the rubber industry, metal processing, water treatment, and pharmaceutical and chemical industries due to its unique chemical properties. With the continuous development of the fine chemical industry, its application fields will be further expanded and SMBT will play a more important role in industrial production and environmental protection.
Post time: Dec-24-2025