With the development of the aging process, the performance of rubber and its products will gradually decrease, and even lose its use value. In order to prolong the service life of rubber products, the aging process should be inhibited to improve the storage life and service life of rubber and products. This is called aging.

Uses: commonly used as rubber antioxidant 4020, mainly used for natural rubber and nitrile, styrene-butadiene, ethylene-propylene and neoprene synthetic rubber. The aging protection effect caused by high temperature, oxygen and other factors is very good, but the anti-flex aging effect is not good. It needs to be combined with anti-aging agent AW or p-phenylenediamine for anti-oxidation. Mainly used in the production of tires, hoses, tapes, wires and other rubber products.

Now, the world's major producers of p-phenylenediamine rubber aging include joint ventures in the United States and the Netherlands, Cape Town in the United States, Agf Group in the Czech Republic, Lanxen in Germany, and so on. Global p-phenylenediamine market.

In 2005, the phenylenediamine rubber antioxidant produced in China reached about 42kT/a. Due to the difficulty in the synthesis of phenylenediamine antioxidants and the need for some raw materials, there are few domestic manufacturers. The production capacity of China's 4020 rubber antioxidant is 24kT/a. In order to expand production capacity, major production companies have adopted the method of repeatedly building new production lines.