Antioxidant 565

Химические свойства

Antioxidant 565 is a highly effective antioxidant. It prevents gel formation, changes to molecular weight and maintains excellent polymer color in unsaturated elastomers. This grade is highly effective at low concentrations and matches the performance of other stabilizers at higher levels. It exhibits non-staining and low volatility. It allows easy dispersion due to low melting point in elastomeric substrates using melt compounding techniques. It can be incorporated into process streams by dissolving in suitable organic solvents or aromatic extender oils.

Синтез

By taking 2,6-di-tert-butylphenol as the raw material, and then adding sodium nitrite solution dropwise to form an intermediate product of 2,6-di-tert-butyl-4-nitrosophenol solution, with the added Rayon Nickel is used as a catalyst and carbon monoxide is used instead of hydrogen as a reducing agent to overcome hydrogen as a reducing agent. The pressure in the hydrogenation process is high, which is prone to explosion problems. At the same time, iron crystals are added to remove excess carbon monoxide and avoid the effects of carbon monoxide toxicity. The impurities are removed by filtration, and other by-products will not be formed, which can greatly increase the yield of antioxidant 565, and the product purity is high.