For the selection of antioxidants, different antioxidants can be selected due to the different types of rubber and vulcanization methods. The following is an introduction to the antioxidants commonly used in various rubbers.

1. Anti-aging agent for NR and SBR

When choosing an antioxidant, it should be considered from the aspects of improving the heat resistance, ozone resistance and flex resistance of the rubber. There is more demand for antioxidants with good continuous stability.

2. Anti-aging agent for NBR

For NBR, the effect of anti-ozone cracking aging agent is better. This is because the anti-aging agent has good mutual solubility in NBR, so it is difficult to migrate to the rubber surface. If used in combination with paraffin, the effect of ozone resistance can be exhibited. For NBR, the use of low molecular weight paraffin is better.

3. Anti-aging agent used in CR

Compared with NR and SBR, CR has very good ozone resistance, but ozone cracking will also occur after long-term use. In CR, adding a small amount of 810-NA (IPPD), 6C, DP and other anti-ozone cracking aging agents can significantly improve the ozone resistance. In addition, CD (carbodiimide) is effective as a persistent heat-resistant and antiaging agent.

4. Anti-aging agent used by ECO

Chloroether rubber (ECO) is prone to softening and aging. The antioxidants that can effectively inhibit softening and aging include NBC (nickel dibutyldithiocarbamate), MB (mercaptobenzimidazole), and 224 (TMDQ). In chloroether rubber, if an amine antioxidant is added in excess, the ozone resistance will decrease.

5. Anti-aging agent used in ACM (acrylate rubber)

Acrylic rubber aging has both hardening aging and softening aging. Therefore, it is necessary to choose a suitable antioxidant. For hardening and aging acrylate rubber, it is more effective to choose antioxidant CD, and for softening and aging acrylate rubber, 224 and 6C antioxidants can be selected.

6. Anti-aging agent for peroxide vulcanized EPDM rubber

Antioxidants for peroxide vulcanized rubber are generally MB and MBZ (zinc salt of mercaptobenzimidazole) antiaging agents of imidazole type. In addition, amine antiaging agents can also choose to use 224 and CD antiaging agents which have a greater effect on crosslinking. agent. In EPDM, MB and 224 or CD antioxidant can be used together to make the rubber compound have excellent heat resistance. These antioxidants are not used because they are not effective on sulfur vulcanized rubber.