Antioxidant 245
[CAS# 36443-68-2]

Identification

• Classification: Catalysts and additives >> Antioxidant
• Name: Antioxidant 245
• Synonyms: Irganox 245; Triethylene glycol bis(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate
• Molecular Formula: C₃₄H₅₀O₈
• Molecular Weight: 586.76
• CAS Registry Number: 36443-68-2
• EC Number: 253-039-2
• SMILES: CC1=CC(=CC(=C1O)C(C)(C)C)CCC(=O)OCCOCCOCCOC(=O)CCC2=CC(=C(C(=C2)C)O)C(C)(C)C

Properties

• Density: 1.1±0.1 g/cm³, Calc.^*
• Index of Refraction: 1.530, Calc.^*
• Boiling Point: 674.5±50.0 °C (760 mmHg), Calc.^*
• Flash Point: 202.4±23.6 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Safety Data

• Hazard Symbols: GHS09 Warning
• Risk Statements: H410-H412-H413
• Safety Statements: P273-P391-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Chronic hazardous to the aquatic environment	Aquatic Chronic	1	H410
Chronic hazardous to the aquatic environment	Aquatic Chronic	4	H413
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412

Discovery and Applications

Antioxidant 245, also known as 2,6-di-tert-butyl-4-methylphenol (DBM), is a widely used chemical compound in various industries, particularly in plastics and rubber manufacturing. Its discovery is linked to the need for effective stabilizers that can protect materials from oxidative degradation, which can significantly affect their performance and longevity. The compound was first synthesized in the mid-20th century, during a period marked by rapid advancements in polymer chemistry and materials science.

The primary function of Antioxidant 245 is to inhibit the oxidative processes that can lead to the deterioration of polymers. Oxidation occurs when materials are exposed to heat, light, or oxygen, resulting in the breakdown of chemical bonds and the formation of free radicals. These free radicals can initiate chain reactions that further degrade the material, leading to issues such as discoloration, loss of mechanical strength, and embrittlement. Antioxidant 245 effectively interrupts these oxidative chain reactions, thus enhancing the stability and performance of polymer products.

One of the main applications of Antioxidant 245 is in the production of polyethylene and polypropylene. These common thermoplastics are widely used in packaging, automotive components, and consumer goods. The incorporation of Antioxidant 245 into these polymers not only extends their service life but also improves their processing characteristics. By preventing oxidative degradation during manufacturing, Antioxidant 245 helps maintain the integrity of the final products, ensuring they meet the required standards for durability and performance.

In addition to plastics, Antioxidant 245 is also utilized in rubber formulations. The rubber industry relies heavily on antioxidants to protect elastomers from oxidative aging, which can lead to cracking and loss of elasticity. By adding Antioxidant 245 to rubber compounds, manufacturers can enhance the longevity and reliability of tires, seals, and gaskets. This application is critical in automotive and aerospace industries, where material performance is essential for safety and efficiency.

Another significant application of Antioxidant 245 is in the formulation of lubricants and oils. It acts as a stabilizer that prevents oxidative degradation of lubricants, ensuring they maintain their viscosity and performance over time. This is particularly important in automotive engine oils, where high temperatures and mechanical stress can lead to rapid oxidation. The presence of Antioxidant 245 in lubricants extends their service life and reduces the frequency of oil changes, contributing to cost savings and environmental benefits.

The compound's effectiveness as an antioxidant is attributed to its ability to scavenge free radicals and neutralize oxidative species. It is often used in combination with other antioxidants to achieve synergistic effects, enhancing overall performance and stability. This versatility makes Antioxidant 245 a popular choice in various formulations across different industries.

While Antioxidant 245 is generally regarded as safe when used according to recommended guidelines, it is essential to handle it with care. As with any chemical substance, appropriate safety measures should be taken during its storage and use. This includes wearing protective equipment and ensuring adequate ventilation in work areas to minimize exposure.

In summary, Antioxidant 245 is a vital chemical compound with significant applications in plastics, rubber, and lubricant industries. Its ability to prevent oxidative degradation enhances the durability and performance of materials, making it an essential component in many formulations. The ongoing research into its applications and potential formulations continues to highlight the importance of Antioxidant 245 in advancing material science and improving product performance.

References

2019. Antioxidants in Polymer Stabilization. Polymer Degradation and Stability, 167.
DOI: 10.1016/j.polymdegradstab.2019.06.012