Rubber antioxidant are classified according to chemical structure and can be divided into the following five categories.
1. Amine anti-aging agent (subdivided into 6 sub-categories: aldehyde amine anti-aging agent, ketone amine anti-aging agent, diaryl secondary amine, p-phenylenediamine, diphenylamine, alkyl aryl Amine
2. Phenolic anti-aging agents (divided into monophenols, bisphenols, polyphenols)
3. Heterocyclic anti-aging agent
4. Phosphite anti-aging agent
5. Other anti-aging agents (long-acting anti-aging agents, nickel salts, waxes, thioureas, newly developed anti-aging agents)