Synthetic rubber compounds mostly use paraffin as a physical antioxidant that is resistant to ozone and weathering. When the rubber is vulcanized, the paraffin dissolved in it will gradually migrate to the rubber surface after cooling, forming a dense and flexible wax film, thereby isolating ozone in the air and playing a protective role. Compared with ordinary protective wax, modified protective wax has a variety of functional groups (such as carboxyl group, hydroxyl group, etc.) in the molecular structure. The protective ability of modified protective wax is 1.5~3 times higher than that of ordinary protective wax. The use of modified protective wax can reduce the amount of antiozonant.

  Our country's anti-aging agent RD has become one of the main anti-aging agents for radial tire compounds. In particular, the dimer has excellent anti-aging properties, so the content of the dimer should be increased as much as possible. Antioxidant RD has excellent heat-resistant and oxygen-resistant aging performance, and has a strong inhibitory effect on metal ions such as copper, but has poor ozone resistance and flex resistance. ) and so on. Anti-aging agent AW can prevent the cracking of rubber products caused by ozone, especially suitable for rubber products under dynamic conditions. It can be used together with anti-aging agents H, D and 4010 to enhance its performance.

  P-phenylenediamine antioxidants are classified into dialkyl p-phenylenediamines, diaryl p-phenylenediamines and alkylaryl p-phenylenediamines according to the groups attached to p-phenylenediamine. The main varieties of dialkyl-p-phenylenediamine antioxidants are antioxidants 4030 and 288. Anti-aging agent 4030 is easy to disperse, has a large solubility in rubber, no blooming problem when the dosage is large, and has the effect of accelerating the vulcanization and shortening the scorch time of the rubber compound; it has excellent anti-aging effect on static ozone, which is obviously better than ozone resistance. Anti-aging agents 4010NA and 4020 with excellent aging performance are especially suitable for outdoor rubber products such as wires and cables, hoses and tapes under static conditions for a long time.

  The main varieties of alkylaryl-p-phenylenediamine antioxidants are antioxidants 4010, 4010NA, 4020 and H. Anti-aging agent 4020 is currently the most used anti-aging agent for tire compounds. It has excellent protective effect on ozone aging and flexural cracking aging, and also has good protective effect on thermo-oxidative aging and weather aging. It is suitable for NR, BR, SBR, NBR and CR. It can be used in combination with paraffin wax (especially mixed or microcrystalline wax with branched chain) to enhance static protection effect. Compared with antioxidant 4010NA, antioxidant 4020 has better resistance to water extraction and can achieve long-term protection.

  The main varieties of diaryl-p-phenylenediamine antioxidants are antioxidant 3100 and H. Anti-aging agent 3100 is characterized by no spraying, no irritation to the skin, and good protective effect on ozone, oxygen and flex fatigue aging of tires and other rubber products, especially suitable for heavy duty tires and off-road tires with harsh conditions of use. It is also an effective antiozonant for CR. One or two compatibilizing genes are introduced into the benzene rings on both sides of the molecular structure of the antioxidant 3100, so its solubility in rubber increases, which can increase the dosage in the rubber compound, and can completely eliminate the application of antioxidants 4010NA and 4010NA. The defect of 4020 rubber compound turning red is very good for the protection of harmful metals such as copper and manganese; the disadvantage is that the rubber compound becomes dark brown when exposed to light, and the pollution is serious, so it is only suitable for dark color products.

  In recent years, new varieties of rubber antioxidants have been less developed and applied, and as environmental protection requirements become more and more stringent, antioxidants are gradually developing towards high performance and environmental protection. Still the antioxidants RD and 4020.